Fix monolithic build (bug #8079)

[lyx.git] / src / Paragraph.cpp

/**
 * \file Paragraph.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Asger Alstrup
 * \author Lars Gullik Bjønnes
 * \author Richard Heck (XHTML output)
 * \author Jean-Marc Lasgouttes
 * \author Angus Leeming
 * \author John Levon
 * \author André Pönitz
 * \author Dekel Tsur
 * \author Jürgen Vigna
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "Paragraph.h"

#include "LayoutFile.h"
#include "Buffer.h"
#include "BufferParams.h"
#include "Changes.h"
#include "Counters.h"
#include "Encoding.h"
#include "InsetList.h"
#include "Language.h"
#include "LaTeXFeatures.h"
#include "Layout.h"
#include "Length.h"
#include "Font.h"
#include "FontList.h"
#include "LyXRC.h"
#include "OutputParams.h"
#include "output_latex.h"
#include "output_xhtml.h"
#include "ParagraphParameters.h"
#include "SpellChecker.h"
#include "sgml.h"
#include "TextClass.h"
#include "TexRow.h"
#include "Text.h"
#include "WordLangTuple.h"
#include "WordList.h"

#include "frontends/alert.h"

#include "insets/InsetBibitem.h"
#include "insets/InsetLabel.h"
#include "insets/InsetSpecialChar.h"

#include "support/debug.h"
#include "support/docstring_list.h"
#include "support/ExceptionMessage.h"
#include "support/gettext.h"
#include "support/lassert.h"
#include "support/lstrings.h"
#include "support/textutils.h"

#include <sstream>
#include <vector>

using namespace std;
using namespace lyx::support;

namespace lyx {

namespace {
/// Inset identifier (above 0x10ffff, for ucs-4)
char_type const META_INSET = 0x200001;
}


/////////////////////////////////////////////////////////////////////
//
// SpellResultRange
//
/////////////////////////////////////////////////////////////////////

class SpellResultRange {
public:
        SpellResultRange(FontSpan range, SpellChecker::Result result)
        : range_(range), result_(result)
        {}
        ///
        FontSpan const & range() const { return range_; }
        ///
        void range(FontSpan const & r) { range_ = r; }
        ///
        SpellChecker::Result result() const { return result_; }
        ///
        void result(SpellChecker::Result r) { result_ = r; }
        ///
        bool inside(pos_type pos) const { return range_.inside(pos); }
        ///
        bool covered(FontSpan const & r) const
        {
                // 1. first of new range inside current range or
                // 2. last of new range inside current range or
                // 3. first of current range inside new range or
                // 4. last of current range inside new range
                return range_.inside(r.first) || range_.inside(r.last) ||
                        r.inside(range_.first) || r.inside(range_.last);
        }
        ///
        void shift(pos_type pos, int offset)
        {
                if (range_.first > pos) {
                        range_.first += offset;
                        range_.last += offset;
                } else if (range_.last >= pos) {
                        range_.last += offset;
                }
        }
private:
        FontSpan range_ ;
        SpellChecker::Result result_ ;
};


/////////////////////////////////////////////////////////////////////
//
// SpellCheckerState
//
/////////////////////////////////////////////////////////////////////

class SpellCheckerState {
public:
        SpellCheckerState() {
                needs_refresh_ = true;
                current_change_number_ = 0;
        }

        void setRange(FontSpan const fp, SpellChecker::Result state)
        {
                Ranges result;
                RangesIterator et = ranges_.end();
                RangesIterator it = ranges_.begin();
                for (; it != et; ++it) {
                        if (!it->covered(fp))
                                result.push_back(SpellResultRange(it->range(), it->result()));
                        else if (state == SpellChecker::WORD_OK) {
                                // trim or split the current misspelled range
                                // store misspelled ranges only
                                FontSpan range = it->range();
                                if (fp.first > range.first) {
                                        // misspelled area in front of WORD_OK
                                        range.last = fp.first - 1;
                                        result.push_back(SpellResultRange(range, it->result()));
                                        range = it->range();
                                }
                                if (fp.last < range.last) {
                                        // misspelled area after WORD_OK range
                                        range.first = fp.last + 1;
                                        result.push_back(SpellResultRange(range, it->result()));
                                }
                        }
                }
                ranges_ = result;
                if (state != SpellChecker::WORD_OK)
                        ranges_.push_back(SpellResultRange(fp, state));
        }

        void increasePosAfterPos(pos_type pos)
        {
                correctRangesAfterPos(pos, 1);
                needsRefresh(pos);
        }

        void decreasePosAfterPos(pos_type pos)
        {
                correctRangesAfterPos(pos, -1);
                needsRefresh(pos);
        }

        void refreshLast(pos_type pos)
        {
                if (pos < refresh_.last)
                        refresh_.last = pos;
        }

        SpellChecker::Result getState(pos_type pos) const
        {
                SpellChecker::Result result = SpellChecker::WORD_OK;
                RangesIterator et = ranges_.end();
                RangesIterator it = ranges_.begin();
                for (; it != et; ++it) {
                        if(it->inside(pos)) {
                                return it->result();
                        }
                }
                return result;
        }

        FontSpan const & getRange(pos_type pos) const
        {
                /// empty span to indicate mismatch
                static FontSpan empty_;
                RangesIterator et = ranges_.end();
                RangesIterator it = ranges_.begin();
                for (; it != et; ++it) {
                        if(it->inside(pos)) {
                                return it->range();
                        }
                }
                return empty_;
        }

        bool needsRefresh() const {
                return needs_refresh_;
        }

        SpellChecker::ChangeNumber currentChangeNumber() const {
                return current_change_number_;
        }

        void refreshRange(pos_type & first, pos_type & last) const {
                first = refresh_.first;
                last = refresh_.last;
        }

        void needsRefresh(pos_type pos) {
                if (needs_refresh_ && pos != -1) {
                        if (pos < refresh_.first)
                                refresh_.first = pos;
                        if (pos > refresh_.last)
                                refresh_.last = pos;
                } else if (pos != -1) {
                        // init request check for neighbour positions too
                        refresh_.first = pos > 0 ? pos - 1 : 0;
                        // no need for special end of paragraph check
                        refresh_.last = pos + 1;
                }
                needs_refresh_ = pos != -1;
        }

        void needsCompleteRefresh(SpellChecker::ChangeNumber change_number) {
                needs_refresh_ = true;
                refresh_.first = 0;
                refresh_.last = -1;
                current_change_number_ = change_number;
        }

private:
        typedef vector<SpellResultRange> Ranges;
        typedef Ranges::const_iterator RangesIterator;
        Ranges ranges_;
        /// the area of the paragraph with pending spell check
        FontSpan refresh_;
        bool needs_refresh_;
        /// spell state cache version number
        SpellChecker::ChangeNumber current_change_number_;


        void correctRangesAfterPos(pos_type pos, int offset)
        {
                RangesIterator et = ranges_.end();
                Ranges::iterator it = ranges_.begin();
                for (; it != et; ++it) {
                        it->shift(pos, offset);
                }
        }

};

/////////////////////////////////////////////////////////////////////
//
// Paragraph::Private
//
/////////////////////////////////////////////////////////////////////

class Paragraph::Private
{
public:
        ///
        Private(Paragraph * owner, Layout const & layout);
        /// "Copy constructor"
        Private(Private const &, Paragraph * owner);
        /// Copy constructor from \p beg  to \p end
        Private(Private const &, Paragraph * owner, pos_type beg, pos_type end);

        ///
        void insertChar(pos_type pos, char_type c, Change const & change);

        /// Output the surrogate pair formed by \p c and \p next to \p os.
        /// \return the number of characters written.
        int latexSurrogatePair(otexstream & os, char_type c, char_type next,
                               OutputParams const &);

        /// Output a space in appropriate formatting (or a surrogate pair
        /// if the next character is a combining character).
        /// \return whether a surrogate pair was output.
        bool simpleTeXBlanks(OutputParams const &,
                             otexstream &,
                             pos_type i,
                             unsigned int & column,
                             Font const & font,
                             Layout const & style);

        /// Output consecutive unicode chars, belonging to the same script as
        /// specified by the latex macro \p ltx, to \p os starting from \p i.
        /// \return the number of characters written.
        int writeScriptChars(otexstream & os, docstring const & ltx,
                           Change const &, Encoding const &, pos_type & i);

        /// This could go to ParagraphParameters if we want to.
        int startTeXParParams(BufferParams const &, otexstream &,
                              OutputParams const &) const;

        /// This could go to ParagraphParameters if we want to.
        bool endTeXParParams(BufferParams const &, otexstream &,
                             OutputParams const &) const;

        ///
        void latexInset(BufferParams const &,
                                   otexstream &,
                                   OutputParams &,
                                   Font & running_font,
                                   Font & basefont,
                                   Font const & outerfont,
                                   bool & open_font,
                                   Change & running_change,
                                   Layout const & style,
                                   pos_type & i,
                                   unsigned int & column);

        ///
        void latexSpecialChar(
                                   otexstream & os,
                                   OutputParams const & runparams,
                                   Font const & running_font,
                                   Change const & running_change,
                                   Layout const & style,
                                   pos_type & i,
                                   pos_type end_pos,
                                   unsigned int & column);

        ///
        bool latexSpecialT1(
                char_type const c,
                otexstream & os,
                pos_type i,
                unsigned int & column);
        ///
        bool latexSpecialT3(
                char_type const c,
                otexstream & os,
                pos_type i,
                unsigned int & column);
        ///
        bool latexSpecialTypewriter(
                char_type const c,
                otexstream & os,
                pos_type i,
                unsigned int & column);
        ///
        bool latexSpecialPhrase(
                otexstream & os,
                pos_type & i,
                pos_type end_pos,
                unsigned int & column,
                OutputParams const & runparams);

        ///
        void validate(LaTeXFeatures & features) const;

        /// Checks if the paragraph contains only text and no inset or font change.
        bool onlyText(Buffer const & buf, Font const & outerfont,
                      pos_type initial) const;

        /// match a string against a particular point in the paragraph
        bool isTextAt(string const & str, pos_type pos) const;

        /// a vector of speller skip positions
        typedef vector<FontSpan> SkipPositions;
        typedef SkipPositions::const_iterator SkipPositionsIterator;

        void appendSkipPosition(SkipPositions & skips, pos_type const pos) const;
        
        Language * getSpellLanguage(pos_type const from) const;

        Language * locateSpellRange(pos_type & from, pos_type & to,
                                                                SkipPositions & skips) const;

        bool hasSpellerChange() const {
                SpellChecker::ChangeNumber speller_change_number = 0;
                if (theSpellChecker())
                        speller_change_number = theSpellChecker()->changeNumber();
                return speller_change_number > speller_state_.currentChangeNumber();
        }

        bool ignoreWord(docstring const & word) const ;
        
        void setMisspelled(pos_type from, pos_type to, SpellChecker::Result state)
        {
                pos_type textsize = owner_->size();
                // check for sane arguments
                if (to <= from || from >= textsize)
                        return;
                FontSpan fp = FontSpan(from, to - 1);
                speller_state_.setRange(fp, state);
        }

        void requestSpellCheck(pos_type pos) {
                if (pos == -1)
                        speller_state_.needsCompleteRefresh(speller_state_.currentChangeNumber());
                else
                        speller_state_.needsRefresh(pos);
        }

        void readySpellCheck() {
                speller_state_.needsRefresh(-1);
        }

        bool needsSpellCheck() const
        {
                return speller_state_.needsRefresh();
        }

        void rangeOfSpellCheck(pos_type & first, pos_type & last) const
        {
                speller_state_.refreshRange(first, last);
                if (last == -1) {
                        last = owner_->size();
                        return;
                }
                pos_type endpos = last;
                owner_->locateWord(first, endpos, WHOLE_WORD);
                if (endpos < last) {
                        endpos = last;
                        owner_->locateWord(last, endpos, WHOLE_WORD);
                }
                last = endpos;
        }

        int countSkips(SkipPositionsIterator & it, SkipPositionsIterator const et,
                            int & start) const
        {
                int numskips = 0;
                while (it != et && it->first < start) {
                        int skip = it->last - it->first + 1;
                        start += skip;
                        numskips += skip;
                        ++it;
                }
                return numskips;
        }

        void markMisspelledWords(pos_type const & first, pos_type const & last,
                                                         SpellChecker::Result result,
                                                         docstring const & word,
                                                         SkipPositions const & skips);

        InsetCode ownerCode() const
        {
                return inset_owner_ ? inset_owner_->lyxCode() : NO_CODE;
        }

        /// Which Paragraph owns us?
        Paragraph * owner_;

        /// In which Inset?
        Inset const * inset_owner_;

        ///
        FontList fontlist_;

        ///
        int id_;

        ///
        ParagraphParameters params_;

        /// for recording and looking up changes
        Changes changes_;

        ///
        InsetList insetlist_;

        /// end of label
        pos_type begin_of_body_;

        typedef docstring TextContainer;
        ///
        TextContainer text_;

        typedef set<docstring> Words;
        typedef map<Language, Words> LangWordsMap;
        ///
        LangWordsMap words_;
        ///
        Layout const * layout_;
        ///
        SpellCheckerState speller_state_;
};


namespace {

struct special_phrase {
        string phrase;
        docstring macro;
        bool builtin;
};

special_phrase const special_phrases[] = {
        { "LyX", from_ascii("\\LyX{}"), false },
        { "TeX", from_ascii("\\TeX{}"), true },
        { "LaTeX2e", from_ascii("\\LaTeXe{}"), true },
        { "LaTeX", from_ascii("\\LaTeX{}"), true },
};

size_t const phrases_nr = sizeof(special_phrases)/sizeof(special_phrase);

} // namespace anon


Paragraph::Private::Private(Paragraph * owner, Layout const & layout)
        : owner_(owner), inset_owner_(0), id_(-1), begin_of_body_(0), layout_(&layout)
{
        text_.reserve(100);
}


// Initialization of the counter for the paragraph id's,
//
// FIXME: There should be a more intelligent way to generate and use the
// paragraph ids per buffer instead a global static counter for all InsetText
// in the running program.
static int paragraph_id = -1;

Paragraph::Private::Private(Private const & p, Paragraph * owner)
        : owner_(owner), inset_owner_(p.inset_owner_), fontlist_(p.fontlist_),
          params_(p.params_), changes_(p.changes_), insetlist_(p.insetlist_),
          begin_of_body_(p.begin_of_body_), text_(p.text_), words_(p.words_),
          layout_(p.layout_)
{
        id_ = ++paragraph_id;
        requestSpellCheck(p.text_.size());
}


Paragraph::Private::Private(Private const & p, Paragraph * owner,
        pos_type beg, pos_type end)
        : owner_(owner), inset_owner_(p.inset_owner_),
          params_(p.params_), changes_(p.changes_),
          insetlist_(p.insetlist_, beg, end),
          begin_of_body_(p.begin_of_body_), words_(p.words_),
          layout_(p.layout_)
{
        id_ = ++paragraph_id;
        if (beg >= pos_type(p.text_.size()))
                return;
        text_ = p.text_.substr(beg, end - beg);

        FontList::const_iterator fcit = fontlist_.begin();
        FontList::const_iterator fend = fontlist_.end();
        for (; fcit != fend; ++fcit) {
                if (fcit->pos() < beg)
                        continue;
                if (fcit->pos() >= end) {
                        // Add last entry in the fontlist_.
                        fontlist_.set(text_.size() - 1, fcit->font());
                        break;
                }
                // Add a new entry in the fontlist_.
                fontlist_.set(fcit->pos() - beg, fcit->font());
        }
        requestSpellCheck(p.text_.size());
}


void Paragraph::addChangesToToc(DocIterator const & cdit,
        Buffer const & buf) const
{
        d->changes_.addToToc(cdit, buf);
}


bool Paragraph::isDeleted(pos_type start, pos_type end) const
{
        LASSERT(start >= 0 && start <= size(), /**/);
        LASSERT(end > start && end <= size() + 1, /**/);

        return d->changes_.isDeleted(start, end);
}


bool Paragraph::isChanged(pos_type start, pos_type end) const
{
        LASSERT(start >= 0 && start <= size(), /**/);
        LASSERT(end > start && end <= size() + 1, /**/);

        return d->changes_.isChanged(start, end);
}


bool Paragraph::isMergedOnEndOfParDeletion(bool trackChanges) const
{
        // keep the logic here in sync with the logic of eraseChars()
        if (!trackChanges)
                return true;

        Change const change = d->changes_.lookup(size());
        return change.inserted() && change.currentAuthor();
}


void Paragraph::setChange(Change const & change)
{
        // beware of the imaginary end-of-par character!
        d->changes_.set(change, 0, size() + 1);

        /*
         * Propagate the change recursively - but not in case of DELETED!
         *
         * Imagine that your co-author makes changes in an existing inset. He
         * sends your document to you and you come to the conclusion that the
         * inset should go completely. If you erase it, LyX must not delete all
         * text within the inset. Otherwise, the change tracked insertions of
         * your co-author get lost and there is no way to restore them later.
         *
         * Conclusion: An inset's content should remain untouched if you delete it
         */

        if (!change.deleted()) {
                for (pos_type pos = 0; pos < size(); ++pos) {
                        if (Inset * inset = getInset(pos))
                                inset->setChange(change);
                }
        }
}


void Paragraph::setChange(pos_type pos, Change const & change)
{
        LASSERT(pos >= 0 && pos <= size(), /**/);
        d->changes_.set(change, pos);

        // see comment in setChange(Change const &) above
        if (!change.deleted() && pos < size())
                        if (Inset * inset = getInset(pos))
                                inset->setChange(change);
}


Change const & Paragraph::lookupChange(pos_type pos) const
{
        LASSERT(pos >= 0 && pos <= size(), /**/);
        return d->changes_.lookup(pos);
}


void Paragraph::acceptChanges(pos_type start, pos_type end)
{
        LASSERT(start >= 0 && start <= size(), /**/);
        LASSERT(end > start && end <= size() + 1, /**/);

        for (pos_type pos = start; pos < end; ++pos) {
                switch (lookupChange(pos).type) {
                        case Change::UNCHANGED:
                                // accept changes in nested inset
                                if (Inset * inset = getInset(pos))
                                        inset->acceptChanges();
                                break;

                        case Change::INSERTED:
                                d->changes_.set(Change(Change::UNCHANGED), pos);
                                // also accept changes in nested inset
                                if (Inset * inset = getInset(pos))
                                        inset->acceptChanges();
                                break;

                        case Change::DELETED:
                                // Suppress access to non-existent
                                // "end-of-paragraph char"
                                if (pos < size()) {
                                        eraseChar(pos, false);
                                        --end;
                                        --pos;
                                }
                                break;
                }

        }
}


void Paragraph::rejectChanges(pos_type start, pos_type end)
{
        LASSERT(start >= 0 && start <= size(), /**/);
        LASSERT(end > start && end <= size() + 1, /**/);

        for (pos_type pos = start; pos < end; ++pos) {
                switch (lookupChange(pos).type) {
                        case Change::UNCHANGED:
                                // reject changes in nested inset
                                if (Inset * inset = getInset(pos))
                                                inset->rejectChanges();
                                break;

                        case Change::INSERTED:
                                // Suppress access to non-existent
                                // "end-of-paragraph char"
                                if (pos < size()) {
                                        eraseChar(pos, false);
                                        --end;
                                        --pos;
                                }
                                break;

                        case Change::DELETED:
                                d->changes_.set(Change(Change::UNCHANGED), pos);

                                // Do NOT reject changes within a deleted inset!
                                // There may be insertions of a co-author inside of it!

                                break;
                }
        }
}


void Paragraph::Private::insertChar(pos_type pos, char_type c,
                Change const & change)
{
        LASSERT(pos >= 0 && pos <= int(text_.size()), /**/);

        // track change
        changes_.insert(change, pos);

        // This is actually very common when parsing buffers (and
        // maybe inserting ascii text)
        if (pos == pos_type(text_.size())) {
                // when appending characters, no need to update tables
                text_.push_back(c);
                // but we want spell checking
                requestSpellCheck(pos);
                return;
        }

        text_.insert(text_.begin() + pos, c);

        // Update the font table.
        fontlist_.increasePosAfterPos(pos);

        // Update the insets
        insetlist_.increasePosAfterPos(pos);

        // Update list of misspelled positions
        speller_state_.increasePosAfterPos(pos);
}


bool Paragraph::insertInset(pos_type pos, Inset * inset,
                                   Change const & change)
{
        LASSERT(inset, /**/);
        LASSERT(pos >= 0 && pos <= size(), /**/);

        // Paragraph::insertInset() can be used in cut/copy/paste operation where
        // d->inset_owner_ is not set yet.
        if (d->inset_owner_ && !d->inset_owner_->insetAllowed(inset->lyxCode()))
                return false;

        d->insertChar(pos, META_INSET, change);
        LASSERT(d->text_[pos] == META_INSET, /**/);

        // Add a new entry in the insetlist_.
        d->insetlist_.insert(inset, pos);

        // Some insets require run of spell checker
        requestSpellCheck(pos);
        return true;
}


bool Paragraph::eraseChar(pos_type pos, bool trackChanges)
{
        LASSERT(pos >= 0 && pos <= size(), return false);

        // keep the logic here in sync with the logic of isMergedOnEndOfParDeletion()

        if (trackChanges) {
                Change change = d->changes_.lookup(pos);

                // set the character to DELETED if
                //  a) it was previously unchanged or
                //  b) it was inserted by a co-author

                if (!change.changed() ||
                      (change.inserted() && !change.currentAuthor())) {
                        setChange(pos, Change(Change::DELETED));
                        // request run of spell checker
                        requestSpellCheck(pos);
                        return false;
                }

                if (change.deleted())
                        return false;
        }

        // Don't physically access the imaginary end-of-paragraph character.
        // eraseChar() can only mark it as DELETED. A physical deletion of
        // end-of-par must be handled externally.
        if (pos == size()) {
                return false;
        }

        // track change
        d->changes_.erase(pos);

        // if it is an inset, delete the inset entry
        if (d->text_[pos] == META_INSET)
                d->insetlist_.erase(pos);

        d->text_.erase(d->text_.begin() + pos);

        // Update the fontlist_
        d->fontlist_.erase(pos);

        // Update the insetlist_
        d->insetlist_.decreasePosAfterPos(pos);

        // Update list of misspelled positions
        d->speller_state_.decreasePosAfterPos(pos);
        d->speller_state_.refreshLast(size());

        return true;
}


int Paragraph::eraseChars(pos_type start, pos_type end, bool trackChanges)
{
        LASSERT(start >= 0 && start <= size(), /**/);
        LASSERT(end >= start && end <= size() + 1, /**/);

        pos_type i = start;
        for (pos_type count = end - start; count; --count) {
                if (!eraseChar(i, trackChanges))
                        ++i;
        }
        return end - i;
}


int Paragraph::Private::latexSurrogatePair(otexstream & os, char_type c,
                char_type next, OutputParams const & runparams)
{
        // Writing next here may circumvent a possible font change between
        // c and next. Since next is only output if it forms a surrogate pair
        // with c we can ignore this:
        // A font change inside a surrogate pair does not make sense and is
        // hopefully impossible to input.
        // FIXME: change tracking
        // Is this correct WRT change tracking?
        Encoding const & encoding = *(runparams.encoding);
        docstring const latex1 = encoding.latexChar(next);
        docstring const latex2 = encoding.latexChar(c);
        if (docstring(1, next) == latex1) {
                // the encoding supports the combination
                os << latex2 << latex1;
                return latex1.length() + latex2.length();
        } else if (runparams.local_font &&
                   runparams.local_font->language()->lang() == "polutonikogreek") {
                // polutonikogreek only works without the brackets
                os << latex1 << latex2;
                return latex1.length() + latex2.length();
        } else
                os << latex1 << '{' << latex2 << '}';
        return latex1.length() + latex2.length() + 2;
}


bool Paragraph::Private::simpleTeXBlanks(OutputParams const & runparams,
                                       otexstream & os,
                                       pos_type i,
                                       unsigned int & column,
                                       Font const & font,
                                       Layout const & style)
{
        if (style.pass_thru || runparams.pass_thru)
                return false;

        if (i + 1 < int(text_.size())) {
                char_type next = text_[i + 1];
                if (Encodings::isCombiningChar(next)) {
                        // This space has an accent, so we must always output it.
                        column += latexSurrogatePair(os, ' ', next, runparams) - 1;
                        return true;
                }
        }

        if (runparams.linelen > 0
            && column > runparams.linelen
            && i
            && text_[i - 1] != ' '
            && (i + 1 < int(text_.size()))
            // same in FreeSpacing mode
            && !owner_->isFreeSpacing()
            // In typewriter mode, we want to avoid
            // ! . ? : at the end of a line
            && !(font.fontInfo().family() == TYPEWRITER_FAMILY
                 && (text_[i - 1] == '.'
                     || text_[i - 1] == '?'
                     || text_[i - 1] == ':'
                     || text_[i - 1] == '!'))) {
                os << '\n';
                os.texrow().start(owner_->id(), i + 1);
                column = 0;
        } else if (style.free_spacing) {
                os << '~';
        } else {
                os << ' ';
        }
        return false;
}


int Paragraph::Private::writeScriptChars(otexstream & os,
                                         docstring const & ltx,
                                         Change const & runningChange,
                                         Encoding const & encoding,
                                         pos_type & i)
{
        // FIXME: modifying i here is not very nice...

        // We only arrive here when a proper language for character text_[i] has
        // not been specified (i.e., it could not be translated in the current
        // latex encoding) or its latex translation has been forced, and it
        // belongs to a known script.
        // Parameter ltx contains the latex translation of text_[i] as specified
        // in the unicodesymbols file and is something like "\textXXX{<spec>}".
        // The latex macro name "textXXX" specifies the script to which text_[i]
        // belongs and we use it in order to check whether characters from the
        // same script immediately follow, such that we can collect them in a
        // single "\textXXX" macro. So, we have to retain "\textXXX{<spec>"
        // for the first char but only "<spec>" for all subsequent chars.
        docstring::size_type const brace1 = ltx.find_first_of(from_ascii("{"));
        docstring::size_type const brace2 = ltx.find_last_of(from_ascii("}"));
        string script = to_ascii(ltx.substr(1, brace1 - 1));
        int pos = 0;
        int length = brace2;
        bool closing_brace = true;
        if (script == "textgreek" && encoding.latexName() == "iso-8859-7") {
                // Correct encoding is being used, so we can avoid \textgreek.
                pos = brace1 + 1;
                length -= pos;
                closing_brace = false;
        }
        os << ltx.substr(pos, length);
        int size = text_.size();
        while (i + 1 < size) {
                char_type const next = text_[i + 1];
                // Stop here if next character belongs to another script
                // or there is a change in change tracking status.
                if (!Encodings::isKnownScriptChar(next, script) ||
                    runningChange != owner_->lookupChange(i + 1))
                        break;
                Font prev_font;
                bool found = false;
                FontList::const_iterator cit = fontlist_.begin();
                FontList::const_iterator end = fontlist_.end();
                for (; cit != end; ++cit) {
                        if (cit->pos() >= i && !found) {
                                prev_font = cit->font();
                                found = true;
                        }
                        if (cit->pos() >= i + 1)
                                break;
                }
                // Stop here if there is a font attribute or encoding change.
                if (found && cit != end && prev_font != cit->font())
                        break;
                docstring const latex = encoding.latexChar(next);
                docstring::size_type const b1 =
                                        latex.find_first_of(from_ascii("{"));
                docstring::size_type const b2 =
                                        latex.find_last_of(from_ascii("}"));
                int const len = b2 - b1 - 1;
                os << latex.substr(b1 + 1, len);
                length += len;
                ++i;
        }
        if (closing_brace) {
                os << '}';
                ++length;
        }
        return length;
}


bool Paragraph::Private::isTextAt(string const & str, pos_type pos) const
{
        pos_type const len = str.length();

        // is the paragraph large enough?
        if (pos + len > int(text_.size()))
                return false;

        // does the wanted text start at point?
        for (string::size_type i = 0; i < str.length(); ++i) {
                // Caution: direct comparison of characters works only
                // because str is pure ASCII.
                if (str[i] != text_[pos + i])
                        return false;
        }

        return fontlist_.hasChangeInRange(pos, len);
}


void Paragraph::Private::latexInset(BufferParams const & bparams,
                                    otexstream & os,
                                    OutputParams & runparams,
                                    Font & running_font,
                                    Font & basefont,
                                    Font const & outerfont,
                                    bool & open_font,
                                    Change & running_change,
                                    Layout const & style,
                                    pos_type & i,
                                    unsigned int & column)
{
        Inset * inset = owner_->getInset(i);
        LASSERT(inset, /**/);

        if (style.pass_thru) {
                inset->plaintext(os.os(), runparams);
                return;
        }

        // FIXME: move this to InsetNewline::latex
        if (inset->lyxCode() == NEWLINE_CODE) {
                // newlines are handled differently here than
                // the default in simpleTeXSpecialChars().
                if (!style.newline_allowed) {
                        os << '\n';
                } else {
                        if (open_font) {
                                column += running_font.latexWriteEndChanges(
                                        os, bparams, runparams,
                                        basefont, basefont);
                                open_font = false;
                        }

                        if (running_font.fontInfo().family() == TYPEWRITER_FAMILY)
                                os << '~';

                        basefont = owner_->getLayoutFont(bparams, outerfont);
                        running_font = basefont;

                        if (runparams.moving_arg)
                                os << "\\protect ";

                }
                os.texrow().start(owner_->id(), i + 1);
                column = 0;
        }

        if (owner_->isDeleted(i)) {
                if( ++runparams.inDeletedInset == 1)
                        runparams.changeOfDeletedInset = owner_->lookupChange(i);
        }

        if (inset->canTrackChanges()) {
                column += Changes::latexMarkChange(os, bparams, running_change,
                        Change(Change::UNCHANGED), runparams);
                running_change = Change(Change::UNCHANGED);
        }

        bool close = false;
        odocstream::pos_type const len = os.os().tellp();

        if (inset->forceLTR()
            && running_font.isRightToLeft()
            // ERT is an exception, it should be output with no
            // decorations at all
            && inset->lyxCode() != ERT_CODE) {
                if (running_font.language()->lang() == "farsi")
                        os << "\\beginL{}";
                else
                        os << "\\L{";
                close = true;
        }

        // FIXME: Bug: we can have an empty font change here!
        // if there has just been a font change, we are going to close it
        // right now, which means stupid latex code like \textsf{}. AFAIK,
        // this does not harm dvi output. A minor bug, thus (JMarc)

        // Some insets cannot be inside a font change command.
        // However, even such insets *can* be placed in \L or \R
        // or their equivalents (for RTL language switches), so we don't
        // close the language in those cases.
        // ArabTeX, though, cannot handle this special behavior, it seems.
        bool arabtex = basefont.language()->lang() == "arabic_arabtex"
                || running_font.language()->lang() == "arabic_arabtex";
        if (open_font && !inset->inheritFont()) {
                bool closeLanguage = arabtex
                        || basefont.isRightToLeft() == running_font.isRightToLeft();
                unsigned int count = running_font.latexWriteEndChanges(os,
                        bparams, runparams, basefont, basefont, closeLanguage);
                column += count;
                // if any font properties were closed, update the running_font,
                // making sure, however, to leave the language as it was
                if (count > 0) {
                        // FIXME: probably a better way to keep track of the old
                        // language, than copying the entire font?
                        Font const copy_font(running_font);
                        basefont = owner_->getLayoutFont(bparams, outerfont);
                        running_font = basefont;
                        if (!closeLanguage)
                                running_font.setLanguage(copy_font.language());
                        // leave font open if language is still open
                        open_font = (running_font.language() == basefont.language());
                        if (closeLanguage)
                                runparams.local_font = &basefont;
                }
        }

        int prev_rows = os.texrow().rows();

        try {
                runparams.lastid = id_;
                runparams.lastpos = i;
                inset->latex(os, runparams);
        } catch (EncodingException & e) {
                // add location information and throw again.
                e.par_id = id_;
                e.pos = i;
                throw(e);
        }

        if (close) {
                if (running_font.language()->lang() == "farsi")
                                os << "\\endL{}";
                        else
                                os << '}';
        }

        if (os.texrow().rows() > prev_rows) {
                os.texrow().start(owner_->id(), i + 1);
                column = 0;
        } else {
                column += (unsigned int)(os.os().tellp() - len);
        }

        if (owner_->isDeleted(i))
                --runparams.inDeletedInset;
}


void Paragraph::Private::latexSpecialChar(otexstream & os,
                                          OutputParams const & runparams,
                                          Font const & running_font,
                                          Change const & running_change,
                                          Layout const & style,
                                          pos_type & i,
                                          pos_type end_pos,
                                          unsigned int & column)
{
        char_type const c = text_[i];

        if (style.pass_thru || runparams.pass_thru) {
                if (c != '\0') {
                        Encoding const * const enc = runparams.encoding;
                        if (enc && enc->latexChar(c, true).empty())
                                throw EncodingException(c);
                        os.put(c);
                }
                return;
        }

        // TIPA uses its own T3 encoding
        if (runparams.inIPA && latexSpecialT3(c, os, i, column))
                return;
        // If T1 font encoding is used, use the special
        // characters it provides.
        // NOTE: some languages reset the font encoding
        // internally
        if (!runparams.inIPA && !running_font.language()->internalFontEncoding()
            && lyxrc.fontenc == "T1" && latexSpecialT1(c, os, i, column))
                return;

        // \tt font needs special treatment
        if (!runparams.inIPA
             && running_font.fontInfo().family() == TYPEWRITER_FAMILY
             && latexSpecialTypewriter(c, os, i, column))
                return;

        // Otherwise, we use what LaTeX provides us.
        switch (c) {
        case '\\':
                os << "\\textbackslash{}";
                column += 15;
                break;
        case '<':
                os << "\\textless{}";
                column += 10;
                break;
        case '>':
                os << "\\textgreater{}";
                column += 13;
                break;
        case '|':
                os << "\\textbar{}";
                column += 9;
                break;
        case '-':
                os << '-';
                break;
        case '\"':
                os << "\\char`\\\"{}";
                column += 9;
                break;

        case '$': case '&':
        case '%': case '#': case '{':
        case '}': case '_':
                os << '\\';
                os.put(c);
                column += 1;
                break;

        case '~':
                os << "\\textasciitilde{}";
                column += 16;
                break;

        case '^':
                os << "\\textasciicircum{}";
                column += 17;
                break;

        case '*':
        case '[':
        case ']':
                // avoid being mistaken for optional arguments
                os << '{';
                os.put(c);
                os << '}';
                column += 2;
                break;

        case ' ':
                // Blanks are printed before font switching.
                // Sure? I am not! (try nice-latex)
                // I am sure it's correct. LyX might be smarter
                // in the future, but for now, nothing wrong is
                // written. (Asger)
                break;

        default:
                // LyX, LaTeX etc.
                if (latexSpecialPhrase(os, i, end_pos, column, runparams))
                        return;

                if (c == '\0')
                        return;

                Encoding const & encoding = *(runparams.encoding);
                char_type next = '\0';
                if (i + 1 < int(text_.size())) {
                        next = text_[i + 1];
                        if (Encodings::isCombiningChar(next)) {
                                column += latexSurrogatePair(os, c, next, runparams) - 1;
                                ++i;
                                break;
                        }
                }
                string script;
                docstring latex = encoding.latexChar(c);
                docstring nextlatex;
                if (next != '\0' && next != META_INSET)
                        nextlatex = encoding.latexChar(next);
                bool tipas = false;
                if (runparams.inIPA) {
                        string const tipashortcut = Encodings::TIPAShortcut(c);
                        if (!tipashortcut.empty()) {
                                latex = from_ascii(tipashortcut);
                                tipas = true;
                        }
                }
                if (Encodings::isKnownScriptChar(c, script)
                    && prefixIs(latex, from_ascii("\\" + script)))
                        column += writeScriptChars(os, latex,
                                        running_change, encoding, i) - 1;
                else if (Encodings::needsTermination(c)
                         && !prefixIs(nextlatex, from_ascii("\\"))
                         && !prefixIs(nextlatex, from_ascii("{"))
                         && !prefixIs(nextlatex, from_ascii("}"))
                         && latex.length() > 1 && latex[latex.length() - 1] != '}'
                         && latex[latex.length() - 1] != '-' && !tipas) {
                        // Prevent eating of a following
                        // space or command corruption by
                        // following characters
                        if (next == ' ' || next == '\0') {
                                column += latex.length() + 1;
                                os << latex << "{}";
                        } else {
                                column += latex.length();
                                os << latex << " ";
                        }
                } else {
                        column += latex.length() - 1;
                        os << latex;
                }
                break;
        }
}


bool Paragraph::Private::latexSpecialT1(char_type const c, otexstream & os,
        pos_type i, unsigned int & column)
{
        switch (c) {
        case '>':
        case '<':
                os.put(c);
                // In T1 encoding, these characters exist
                // but we should avoid ligatures
                if (i + 1 >= int(text_.size()) || text_[i + 1] != c)
                        return true;
                os << "\\textcompwordmark{}";
                column += 19;
                return true;
        case '|':
                os.put(c);
                return true;
        case '\"':
                // soul.sty breaks with \char`\"
                os << "\\textquotedbl{}";
                column += 14;
                return true;
        default:
                return false;
        }
}


bool Paragraph::Private::latexSpecialT3(char_type const c, otexstream & os,
        pos_type /*i*/, unsigned int & /*column*/)
{
        switch (c) {
        case '*':
        case '[':
        case ']':
        case '|':
        case '\"':
                os.put(c);
                return true;
        default:
                return false;
        }
}


bool Paragraph::Private::latexSpecialTypewriter(char_type const c, otexstream & os,
        pos_type i, unsigned int & column)
{
        switch (c) {
        case '-':
                // within \ttfamily, "--" is merged to "-" (no endash)
                // so we avoid this rather irritating ligature
                if (i + 1 < int(text_.size()) && text_[i + 1] == '-') {
                        os << "-{}";
                        column += 2;
                } else
                        os << '-';
                return true;

        // everything else has to be checked separately
        // (depending on the encoding)
        default:
                return false;
        }
}


/// \param end_pos
///   If [start_pos, end_pos) does not include entirely the special phrase, then
///   do not apply the macro transformation.
bool Paragraph::Private::latexSpecialPhrase(otexstream & os, pos_type & i, pos_type end_pos,
        unsigned int & column, OutputParams const & runparams)
{
        // FIXME: if we have "LaTeX" with a font
        // change in the middle (before the 'T', then
        // the "TeX" part is still special cased.
        // Really we should only operate this on
        // "words" for some definition of word

        for (size_t pnr = 0; pnr < phrases_nr; ++pnr) {
                if (!isTextAt(special_phrases[pnr].phrase, i)
                    || (end_pos != -1 && i + int(special_phrases[pnr].phrase.size()) > end_pos))
                        continue;
                if (runparams.moving_arg)
                        os << "\\protect";
                os << special_phrases[pnr].macro;
                i += special_phrases[pnr].phrase.length() - 1;
                column += special_phrases[pnr].macro.length() - 1;
                return true;
        }
        return false;
}


void Paragraph::Private::validate(LaTeXFeatures & features) const
{
        if (layout_->inpreamble && inset_owner_) {
                bool const is_command = layout_->latextype == LATEX_COMMAND;
                Buffer const & buf = inset_owner_->buffer();
                BufferParams const & bp = buf.params();
                Font f;
                TexRow texrow;
                // Using a string stream here circumvents the encoding
                // switching machinery of odocstream. Therefore the
                // output is wrong if this paragraph contains content
                // that needs to switch encoding.
                odocstringstream ods;
                otexstream os(ods, texrow);
                if (is_command) {
                        os << '\\' << from_ascii(layout_->latexname());
                        // we have to provide all the optional arguments here, even though
                        // the last one is the only one we care about.
                        // Separate handling of optional argument inset.
                        if (layout_->optargs != 0 || layout_->reqargs != 0)
                                latexArgInsets(*owner_, os, features.runparams(),
                                        layout_->reqargs, layout_->optargs);
                        else
                                os << from_ascii(layout_->latexparam());
                }
                docstring::size_type const length = ods.str().length();
                // this will output "{" at the beginning, but not at the end
                owner_->latex(bp, f, os, features.runparams(), 0, -1, true);
                if (ods.str().length() > length) {
                        if (is_command)
                                ods << '}';
                        string const snippet = to_utf8(ods.str());
                        features.addPreambleSnippet(snippet);
                }
        }

        if (features.runparams().flavor == OutputParams::HTML
            && layout_->htmltitle()) {
                features.setHTMLTitle(owner_->asString(AS_STR_INSETS));
        }

        // check the params.
        if (!params_.spacing().isDefault())
                features.require("setspace");

        // then the layouts
        features.useLayout(layout_->name());

        // then the fonts
        fontlist_.validate(features);

        // then the indentation
        if (!params_.leftIndent().zero())
                features.require("ParagraphLeftIndent");

        // then the insets
        InsetList::const_iterator icit = insetlist_.begin();
        InsetList::const_iterator iend = insetlist_.end();
        for (; icit != iend; ++icit) {
                if (icit->inset) {
                        icit->inset->validate(features);
                        if (layout_->needprotect &&
                            icit->inset->lyxCode() == FOOT_CODE)
                                features.require("NeedLyXFootnoteCode");
                }
        }

        // then the contents
        for (pos_type i = 0; i < int(text_.size()) ; ++i) {
                for (size_t pnr = 0; pnr < phrases_nr; ++pnr) {
                        if (!special_phrases[pnr].builtin
                            && isTextAt(special_phrases[pnr].phrase, i)) {
                                features.require(special_phrases[pnr].phrase);
                                break;
                        }
                }
                Encodings::validate(text_[i], features);
        }
}

/////////////////////////////////////////////////////////////////////
//
// Paragraph
//
/////////////////////////////////////////////////////////////////////

namespace {
        Layout const emptyParagraphLayout;
}

Paragraph::Paragraph()
        : d(new Paragraph::Private(this, emptyParagraphLayout))
{
        itemdepth = 0;
        d->params_.clear();
}


Paragraph::Paragraph(Paragraph const & par)
        : itemdepth(par.itemdepth),
        d(new Paragraph::Private(*par.d, this))
{
        registerWords();
}


Paragraph::Paragraph(Paragraph const & par, pos_type beg, pos_type end)
        : itemdepth(par.itemdepth),
        d(new Paragraph::Private(*par.d, this, beg, end))
{
        registerWords();
}


Paragraph & Paragraph::operator=(Paragraph const & par)
{
        // needed as we will destroy the private part before copying it
        if (&par != this) {
                itemdepth = par.itemdepth;

                deregisterWords();
                delete d;
                d = new Private(*par.d, this);
                registerWords();
        }
        return *this;
}


Paragraph::~Paragraph()
{
        deregisterWords();
        delete d;
}


namespace {

// this shall be called just before every "os << ..." action.
void flushString(ostream & os, docstring & s)
{
        os << to_utf8(s);
        s.erase();
}

}


void Paragraph::write(ostream & os, BufferParams const & bparams,
        depth_type & dth) const
{
        // The beginning or end of a deeper (i.e. nested) area?
        if (dth != d->params_.depth()) {
                if (d->params_.depth() > dth) {
                        while (d->params_.depth() > dth) {
                                os << "\n\\begin_deeper";
                                ++dth;
                        }
                } else {
                        while (d->params_.depth() < dth) {
                                os << "\n\\end_deeper";
                                --dth;
                        }
                }
        }

        // First write the layout
        os << "\n\\begin_layout " << to_utf8(d->layout_->name()) << '\n';

        d->params_.write(os);

        Font font1(inherit_font, bparams.language);

        Change running_change = Change(Change::UNCHANGED);

        // this string is used as a buffer to avoid repetitive calls
        // to to_utf8(), which turn out to be expensive (JMarc)
        docstring write_buffer;

        int column = 0;
        for (pos_type i = 0; i <= size(); ++i) {

                Change const change = lookupChange(i);
                if (change != running_change)
                        flushString(os, write_buffer);
                Changes::lyxMarkChange(os, bparams, column, running_change, change);
                running_change = change;

                if (i == size())
                        break;

                // Write font changes
                Font font2 = getFontSettings(bparams, i);
                if (font2 != font1) {
                        flushString(os, write_buffer);
                        font2.lyxWriteChanges(font1, os);
                        column = 0;
                        font1 = font2;
                }

                char_type const c = d->text_[i];
                switch (c) {
                case META_INSET:
                        if (Inset const * inset = getInset(i)) {
                                flushString(os, write_buffer);
                                if (inset->directWrite()) {
                                        // international char, let it write
                                        // code directly so it's shorter in
                                        // the file
                                        inset->write(os);
                                } else {
                                        if (i)
                                                os << '\n';
                                        os << "\\begin_inset ";
                                        inset->write(os);
                                        os << "\n\\end_inset\n\n";
                                        column = 0;
                                }
                        }
                        break;
                case '\\':
                        flushString(os, write_buffer);
                        os << "\n\\backslash\n";
                        column = 0;
                        break;
                case '.':
                        flushString(os, write_buffer);
                        if (i + 1 < size() && d->text_[i + 1] == ' ') {
                                os << ".\n";
                                column = 0;
                        } else
                                os << '.';
                        break;
                default:
                        if ((column > 70 && c == ' ')
                            || column > 79) {
                                flushString(os, write_buffer);
                                os << '\n';
                                column = 0;
                        }
                        // this check is to amend a bug. LyX sometimes
                        // inserts '\0' this could cause problems.
                        if (c != '\0')
                                write_buffer.push_back(c);
                        else
                                LYXERR0("NUL char in structure.");
                        ++column;
                        break;
                }
        }

        flushString(os, write_buffer);
        os << "\n\\end_layout\n";
}


void Paragraph::validate(LaTeXFeatures & features) const
{
        d->validate(features);
}


void Paragraph::insert(pos_type start, docstring const & str,
                       Font const & font, Change const & change)
{
        for (size_t i = 0, n = str.size(); i != n ; ++i)
                insertChar(start + i, str[i], font, change);
}


void Paragraph::appendChar(char_type c, Font const & font,
                Change const & change)
{
        // track change
        d->changes_.insert(change, d->text_.size());
        // when appending characters, no need to update tables
        d->text_.push_back(c);
        setFont(d->text_.size() - 1, font);
        d->requestSpellCheck(d->text_.size() - 1);
}


void Paragraph::appendString(docstring const & s, Font const & font,
                Change const & change)
{
        pos_type end = s.size();
        size_t oldsize = d->text_.size();
        size_t newsize = oldsize + end;
        size_t capacity = d->text_.capacity();
        if (newsize >= capacity)
                d->text_.reserve(max(capacity + 100, newsize));

        // when appending characters, no need to update tables
        d->text_.append(s);

        // FIXME: Optimize this!
        for (size_t i = oldsize; i != newsize; ++i) {
                // track change
                d->changes_.insert(change, i);
                d->requestSpellCheck(i);
        }
        d->fontlist_.set(oldsize, font);
        d->fontlist_.set(newsize - 1, font);
}


void Paragraph::insertChar(pos_type pos, char_type c,
                           bool trackChanges)
{
        d->insertChar(pos, c, Change(trackChanges ?
                           Change::INSERTED : Change::UNCHANGED));
}


void Paragraph::insertChar(pos_type pos, char_type c,
                           Font const & font, bool trackChanges)
{
        d->insertChar(pos, c, Change(trackChanges ?
                           Change::INSERTED : Change::UNCHANGED));
        setFont(pos, font);
}


void Paragraph::insertChar(pos_type pos, char_type c,
                           Font const & font, Change const & change)
{
        d->insertChar(pos, c, change);
        setFont(pos, font);
}


bool Paragraph::insertInset(pos_type pos, Inset * inset,
                            Font const & font, Change const & change)
{
        bool const success = insertInset(pos, inset, change);
        // Set the font/language of the inset...
        setFont(pos, font);
        return success;
}


void Paragraph::resetFonts(Font const & font)
{
        d->fontlist_.clear();
        d->fontlist_.set(0, font);
        d->fontlist_.set(d->text_.size() - 1, font);
}

// Gets uninstantiated font setting at position.
Font const & Paragraph::getFontSettings(BufferParams const & bparams,
                                         pos_type pos) const
{
        if (pos > size()) {
                LYXERR0("pos: " << pos << " size: " << size());
                LASSERT(pos <= size(), /**/);
        }

        FontList::const_iterator cit = d->fontlist_.fontIterator(pos);
        if (cit != d->fontlist_.end())
                return cit->font();

        if (pos == size() && !empty())
                return getFontSettings(bparams, pos - 1);

        // Optimisation: avoid a full font instantiation if there is no
        // language change from previous call.
        static Font previous_font;
        static Language const * previous_lang = 0;
        Language const * lang = getParLanguage(bparams);
        if (lang != previous_lang) {
                previous_lang = lang;
                previous_font = Font(inherit_font, lang);
        }
        return previous_font;
}


FontSpan Paragraph::fontSpan(pos_type pos) const
{
        LASSERT(pos <= size(), /**/);
        pos_type start = 0;

        FontList::const_iterator cit = d->fontlist_.begin();
        FontList::const_iterator end = d->fontlist_.end();
        for (; cit != end; ++cit) {
                if (cit->pos() >= pos) {
                        if (pos >= beginOfBody())
                                return FontSpan(max(start, beginOfBody()),
                                                cit->pos());
                        else
                                return FontSpan(start,
                                                min(beginOfBody() - 1,
                                                         cit->pos()));
                }
                start = cit->pos() + 1;
        }

        // This should not happen, but if so, we take no chances.
        // LYXERR0("Paragraph::getEndPosOfFontSpan: This should not happen!");
        return FontSpan(pos, pos);
}


// Gets uninstantiated font setting at position 0
Font const & Paragraph::getFirstFontSettings(BufferParams const & bparams) const
{
        if (!empty() && !d->fontlist_.empty())
                return d->fontlist_.begin()->font();

        // Optimisation: avoid a full font instantiation if there is no
        // language change from previous call.
        static Font previous_font;
        static Language const * previous_lang = 0;
        if (bparams.language != previous_lang) {
                previous_lang = bparams.language;
                previous_font = Font(inherit_font, bparams.language);
        }

        return previous_font;
}


// Gets the fully instantiated font at a given position in a paragraph
// This is basically the same function as Text::GetFont() in text2.cpp.
// The difference is that this one is used for generating the LaTeX file,
// and thus cosmetic "improvements" are disallowed: This has to deliver
// the true picture of the buffer. (Asger)
Font const Paragraph::getFont(BufferParams const & bparams, pos_type pos,
                                 Font const & outerfont) const
{
        LASSERT(pos >= 0, /**/);

        Font font = getFontSettings(bparams, pos);

        pos_type const body_pos = beginOfBody();
        FontInfo & fi = font.fontInfo();
        if (pos < body_pos)
                fi.realize(d->layout_->labelfont);
        else
                fi.realize(d->layout_->font);

        fi.realize(outerfont.fontInfo());
        fi.realize(bparams.getFont().fontInfo());

        return font;
}


Font const Paragraph::getLabelFont
        (BufferParams const & bparams, Font const & outerfont) const
{
        FontInfo tmpfont = d->layout_->labelfont;
        tmpfont.realize(outerfont.fontInfo());
        tmpfont.realize(bparams.getFont().fontInfo());
        return Font(tmpfont, getParLanguage(bparams));
}


Font const Paragraph::getLayoutFont
        (BufferParams const & bparams, Font const & outerfont) const
{
        FontInfo tmpfont = d->layout_->font;
        tmpfont.realize(outerfont.fontInfo());
        tmpfont.realize(bparams.getFont().fontInfo());
        return Font(tmpfont, getParLanguage(bparams));
}


/// Returns the height of the highest font in range
FontSize Paragraph::highestFontInRange
        (pos_type startpos, pos_type endpos, FontSize def_size) const
{
        return d->fontlist_.highestInRange(startpos, endpos, def_size);
}


char_type Paragraph::getUChar(BufferParams const & bparams, pos_type pos) const
{
        char_type c = d->text_[pos];
        if (!lyxrc.rtl_support)
                return c;

        char_type uc = c;
        switch (c) {
        case '(':
                uc = ')';
                break;
        case ')':
                uc = '(';
                break;
        case '[':
                uc = ']';
                break;
        case ']':
                uc = '[';
                break;
        case '{':
                uc = '}';
                break;
        case '}':
                uc = '{';
                break;
        case '<':
                uc = '>';
                break;
        case '>':
                uc = '<';
                break;
        }
        if (uc != c && getFontSettings(bparams, pos).isRightToLeft())
                return uc;
        return c;
}


void Paragraph::setFont(pos_type pos, Font const & font)
{
        LASSERT(pos <= size(), /**/);

        // First, reduce font against layout/label font
        // Update: The setCharFont() routine in text2.cpp already
        // reduces font, so we don't need to do that here. (Asger)

        d->fontlist_.set(pos, font);
}


void Paragraph::makeSameLayout(Paragraph const & par)
{
        d->layout_ = par.d->layout_;
        d->params_ = par.d->params_;
}


bool Paragraph::stripLeadingSpaces(bool trackChanges)
{
        if (isFreeSpacing())
                return false;

        int pos = 0;
        int count = 0;

        while (pos < size() && (isNewline(pos) || isLineSeparator(pos))) {
                if (eraseChar(pos, trackChanges))
                        ++count;
                else
                        ++pos;
        }

        return count > 0 || pos > 0;
}


bool Paragraph::hasSameLayout(Paragraph const & par) const
{
        return par.d->layout_ == d->layout_
                && d->params_.sameLayout(par.d->params_);
}


depth_type Paragraph::getDepth() const
{
        return d->params_.depth();
}


depth_type Paragraph::getMaxDepthAfter() const
{
        if (d->layout_->isEnvironment())
                return d->params_.depth() + 1;
        else
                return d->params_.depth();
}


char Paragraph::getAlign() const
{
        if (d->params_.align() == LYX_ALIGN_LAYOUT)
                return d->layout_->align;
        else
                return d->params_.align();
}


docstring const & Paragraph::labelString() const
{
        return d->params_.labelString();
}


// the next two functions are for the manual labels
docstring const Paragraph::getLabelWidthString() const
{
        if (d->layout_->margintype == MARGIN_MANUAL
            || d->layout_->latextype == LATEX_BIB_ENVIRONMENT)
                return d->params_.labelWidthString();
        else
                return _("Senseless with this layout!");
}


void Paragraph::setLabelWidthString(docstring const & s)
{
        d->params_.labelWidthString(s);
}


docstring Paragraph::expandLabel(Layout const & layout,
                BufferParams const & bparams) const
{
        return expandParagraphLabel(layout, bparams, true);
}


docstring Paragraph::expandDocBookLabel(Layout const & layout,
                BufferParams const & bparams) const
{
        return expandParagraphLabel(layout, bparams, false);
}


docstring Paragraph::expandParagraphLabel(Layout const & layout,
                BufferParams const & bparams, bool process_appendix) const
{
        DocumentClass const & tclass = bparams.documentClass();
        string const & lang = getParLanguage(bparams)->code();
        bool const in_appendix = process_appendix && d->params_.appendix();
        docstring fmt = translateIfPossible(layout.labelstring(in_appendix), lang);

        if (fmt.empty() && layout.labeltype == LABEL_COUNTER
            && !layout.counter.empty())
                return tclass.counters().theCounter(layout.counter, lang);

        // handle 'inherited level parts' in 'fmt',
        // i.e. the stuff between '@' in   '@Section@.\arabic{subsection}'
        size_t const i = fmt.find('@', 0);
        if (i != docstring::npos) {
                size_t const j = fmt.find('@', i + 1);
                if (j != docstring::npos) {
                        docstring parent(fmt, i + 1, j - i - 1);
                        docstring label = from_ascii("??");
                        if (tclass.hasLayout(parent))
                                docstring label = expandParagraphLabel(tclass[parent], bparams,
                                                      process_appendix);
                        fmt = docstring(fmt, 0, i) + label
                                + docstring(fmt, j + 1, docstring::npos);
                }
        }

        return tclass.counters().counterLabel(fmt, lang);
}


void Paragraph::applyLayout(Layout const & new_layout)
{
        d->layout_ = &new_layout;
        LyXAlignment const oldAlign = d->params_.align();

        if (!(oldAlign & d->layout_->alignpossible)) {
                frontend::Alert::warning(_("Alignment not permitted"),
                        _("The new layout does not permit the alignment previously used.\nSetting to default."));
                d->params_.align(LYX_ALIGN_LAYOUT);
        }
}


pos_type Paragraph::beginOfBody() const
{
        return d->begin_of_body_;
}


void Paragraph::setBeginOfBody()
{
        if (d->layout_->labeltype != LABEL_MANUAL) {
                d->begin_of_body_ = 0;
                return;
        }

        // Unroll the first two cycles of the loop
        // and remember the previous character to
        // remove unnecessary getChar() calls
        pos_type i = 0;
        pos_type end = size();
        if (i < end && !isNewline(i)) {
                ++i;
                char_type previous_char = 0;
                char_type temp = 0;
                if (i < end) {
                        previous_char = d->text_[i];
                        if (!isNewline(i)) {
                                ++i;
                                while (i < end && previous_char != ' ') {
                                        temp = d->text_[i];
                                        if (isNewline(i))
                                                break;
                                        ++i;
                                        previous_char = temp;
                                }
                        }
                }
        }

        d->begin_of_body_ = i;
}


bool Paragraph::allowParagraphCustomization() const
{
        return inInset().allowParagraphCustomization();
}


bool Paragraph::usePlainLayout() const
{
        return inInset().usePlainLayout();
}


bool Paragraph::isPassThru() const
{
        return inInset().getLayout().isPassThru() || d->layout_->pass_thru;
}

namespace {

// paragraphs inside floats need different alignment tags to avoid
// unwanted space

bool noTrivlistCentering(InsetCode code)
{
        return code == FLOAT_CODE
               || code == WRAP_CODE
               || code == CELL_CODE;
}


string correction(string const & orig)
{
        if (orig == "flushleft")
                return "raggedright";
        if (orig == "flushright")
                return "raggedleft";
        if (orig == "center")
                return "centering";
        return orig;
}


string const corrected_env(string const & suffix, string const & env,
        InsetCode code, bool const lastpar)
{
        string output = suffix + "{";
        if (noTrivlistCentering(code)) {
                if (lastpar) {
                        // the last paragraph in non-trivlist-aligned
                        // context is special (to avoid unwanted whitespace)
                        if (suffix == "\\begin")
                                return "\\" + correction(env) + "{}";
                        return string();
                }
                output += correction(env);
        } else
                output += env;
        output += "}";
        if (suffix == "\\begin")
                output += "\n";
        return output;
}


void adjust_column(string const & str, int & column)
{
        if (!contains(str, "\n"))
                column += str.size();
        else {
                string tmp;
                column = rsplit(str, tmp, '\n').size();
        }
}

} // namespace anon


int Paragraph::Private::startTeXParParams(BufferParams const & bparams,
                        otexstream & os, OutputParams const & runparams) const
{
        int column = 0;

        if (params_.noindent() && !layout_->pass_thru) {
                os << "\\noindent ";
                column += 10;
        }

        LyXAlignment const curAlign = params_.align();

        if (curAlign == layout_->align)
                return column;

        switch (curAlign) {
        case LYX_ALIGN_NONE:
        case LYX_ALIGN_BLOCK:
        case LYX_ALIGN_LAYOUT:
        case LYX_ALIGN_SPECIAL:
        case LYX_ALIGN_DECIMAL:
                break;
        case LYX_ALIGN_LEFT:
        case LYX_ALIGN_RIGHT:
        case LYX_ALIGN_CENTER:
                if (runparams.moving_arg) {
                        os << "\\protect";
                        column += 8;
                }
                break;
        }

        string const begin_tag = "\\begin";
        InsetCode code = ownerCode();
        bool const lastpar = runparams.isLastPar;

        switch (curAlign) {
        case LYX_ALIGN_NONE:
        case LYX_ALIGN_BLOCK:
        case LYX_ALIGN_LAYOUT:
        case LYX_ALIGN_SPECIAL:
        case LYX_ALIGN_DECIMAL:
                break;
        case LYX_ALIGN_LEFT: {
                string output;
                if (owner_->getParLanguage(bparams)->babel() != "hebrew")
                        output = corrected_env(begin_tag, "flushleft", code, lastpar);
                else
                        output = corrected_env(begin_tag, "flushright", code, lastpar);
                os << from_ascii(output);
                adjust_column(output, column);
                break;
        } case LYX_ALIGN_RIGHT: {
                string output;
                if (owner_->getParLanguage(bparams)->babel() != "hebrew")
                        output = corrected_env(begin_tag, "flushright", code, lastpar);
                else
                        output = corrected_env(begin_tag, "flushleft", code, lastpar);
                os << from_ascii(output);
                adjust_column(output, column);
                break;
        } case LYX_ALIGN_CENTER: {
                string output;
                output = corrected_env(begin_tag, "center", code, lastpar);
                os << from_ascii(output);
                adjust_column(output, column);
                break;
        }
        }

        return column;
}


bool Paragraph::Private::endTeXParParams(BufferParams const & bparams,
                        otexstream & os, OutputParams const & runparams) const
{
        LyXAlignment const curAlign = params_.align();

        if (curAlign == layout_->align)
                return false;

        switch (curAlign) {
        case LYX_ALIGN_NONE:
        case LYX_ALIGN_BLOCK:
        case LYX_ALIGN_LAYOUT:
        case LYX_ALIGN_SPECIAL:
        case LYX_ALIGN_DECIMAL:
                break;
        case LYX_ALIGN_LEFT:
        case LYX_ALIGN_RIGHT:
        case LYX_ALIGN_CENTER:
                if (runparams.moving_arg)
                        os << "\\protect";
                break;
        }

        string output;
        string const end_tag = "\n\\par\\end";
        InsetCode code = ownerCode();
        bool const lastpar = runparams.isLastPar;

        switch (curAlign) {
        case LYX_ALIGN_NONE:
        case LYX_ALIGN_BLOCK:
        case LYX_ALIGN_LAYOUT:
        case LYX_ALIGN_SPECIAL:
        case LYX_ALIGN_DECIMAL:
                break;
        case LYX_ALIGN_LEFT: {
                if (owner_->getParLanguage(bparams)->babel() != "hebrew")
                        output = corrected_env(end_tag, "flushleft", code, lastpar);
                else
                        output = corrected_env(end_tag, "flushright", code, lastpar);
                os << from_ascii(output);
                break;
        } case LYX_ALIGN_RIGHT: {
                if (owner_->getParLanguage(bparams)->babel() != "hebrew")
                        output = corrected_env(end_tag, "flushright", code, lastpar);
                else
                        output = corrected_env(end_tag, "flushleft", code, lastpar);
                os << from_ascii(output);
                break;
        } case LYX_ALIGN_CENTER: {
                output = corrected_env(end_tag, "center", code, lastpar);
                os << from_ascii(output);
                break;
        }
        }

        return !output.empty() || lastpar;
}


// This one spits out the text of the paragraph
void Paragraph::latex(BufferParams const & bparams,
        Font const & outerfont,
        otexstream & os,
        OutputParams const & runparams,
        int start_pos, int end_pos, bool force) const
{
        LYXERR(Debug::LATEX, "Paragraph::latex...     " << this);

        // FIXME This check should not be needed. Perhaps issue an
        // error if it triggers.
        Layout const & style = inInset().forcePlainLayout() ?
                bparams.documentClass().plainLayout() : *d->layout_;

        if (!force && style.inpreamble)
                return;

        bool const allowcust = allowParagraphCustomization();

        // Current base font for all inherited font changes, without any
        // change caused by an individual character, except for the language:
        // It is set to the language of the first character.
        // As long as we are in the label, this font is the base font of the
        // label. Before the first body character it is set to the base font
        // of the body.
        Font basefont;

        // Maybe we have to create a optional argument.
        pos_type body_pos = beginOfBody();
        unsigned int column = 0;

        if (body_pos > 0) {
                // the optional argument is kept in curly brackets in
                // case it contains a ']'
                // This is not strictly needed, but if this is changed it
                // would be a file format change, and tex2lyx would need
                // to be adjusted, since it unconditionally removes the
                // braces when it parses \item.
                os << "[{";
                column += 2;
                basefont = getLabelFont(bparams, outerfont);
        } else {
                basefont = getLayoutFont(bparams, outerfont);
        }

        // Which font is currently active?
        Font running_font(basefont);
        // Do we have an open font change?
        bool open_font = false;

        Change runningChange = Change(Change::UNCHANGED);

        Encoding const * const prev_encoding = runparams.encoding;

        os.texrow().start(id(), 0);

        // if the paragraph is empty, the loop will not be entered at all
        if (empty()) {
                if (style.isCommand()) {
                        os << '{';
                        ++column;
                }
                if (allowcust)
                        column += d->startTeXParParams(bparams, os, runparams);
        }

        for (pos_type i = 0; i < size(); ++i) {
                // First char in paragraph or after label?
                if (i == body_pos) {
                        if (body_pos > 0) {
                                if (open_font) {
                                        column += running_font.latexWriteEndChanges(
                                                os, bparams, runparams,
                                                basefont, basefont);
                                        open_font = false;
                                }
                                basefont = getLayoutFont(bparams, outerfont);
                                running_font = basefont;

                                column += Changes::latexMarkChange(os, bparams,
                                                runningChange, Change(Change::UNCHANGED),
                                                runparams);
                                runningChange = Change(Change::UNCHANGED);

                                os << "}] ";
                                column +=3;
                        }
                        if (style.isCommand()) {
                                os << '{';
                                ++column;
                        }

                        if (allowcust)
                                column += d->startTeXParParams(bparams, os,
                                                            runparams);
                }

                Change const & change = runparams.inDeletedInset
                        ? runparams.changeOfDeletedInset : lookupChange(i);

                if (bparams.outputChanges && runningChange != change) {
                        if (open_font) {
                                column += running_font.latexWriteEndChanges(
                                                os, bparams, runparams, basefont, basefont);
                                open_font = false;
                        }
                        basefont = getLayoutFont(bparams, outerfont);
                        running_font = basefont;

                        column += Changes::latexMarkChange(os, bparams, runningChange,
                                                           change, runparams);
                        runningChange = change;
                }

                // do not output text which is marked deleted
                // if change tracking output is disabled
                if (!bparams.outputChanges && change.deleted()) {
                        continue;
                }

                ++column;

                // Fully instantiated font
                Font const font = getFont(bparams, i, outerfont);

                Font const last_font = running_font;

                // Do we need to close the previous font?
                if (open_font &&
                    (font != running_font ||
                     font.language() != running_font.language()))
                {
                        column += running_font.latexWriteEndChanges(
                                        os, bparams, runparams, basefont,
                                        (i == body_pos-1) ? basefont : font);
                        running_font = basefont;
                        open_font = false;
                }

                string const running_lang = runparams.use_polyglossia ?
                        running_font.language()->polyglossia() : running_font.language()->babel();
                // close babel's font environment before opening CJK.
                string const lang_end_command = runparams.use_polyglossia ?
                        "\\end{$$lang}" : lyxrc.language_command_end;
                if (!running_lang.empty() &&
                    font.language()->encoding()->package() == Encoding::CJK) {
                                string end_tag = subst(lang_end_command,
                                                        "$$lang",
                                                        running_lang);
                                os << from_ascii(end_tag);
                                column += end_tag.length();
                }

                // Switch file encoding if necessary (and allowed)
                if (!runparams.pass_thru && !style.pass_thru &&
                    runparams.encoding->package() != Encoding::none &&
                    font.language()->encoding()->package() != Encoding::none) {
                        pair<bool, int> const enc_switch =
                                switchEncoding(os.os(), bparams, runparams,
                                        *(font.language()->encoding()));
                        if (enc_switch.first) {
                                column += enc_switch.second;
                                runparams.encoding = font.language()->encoding();
                        }
                }

                char_type const c = d->text_[i];

                // Do we need to change font?
                if ((font != running_font ||
                     font.language() != running_font.language()) &&
                        i != body_pos - 1)
                {
                        odocstringstream ods;
                        column += font.latexWriteStartChanges(ods, bparams,
                                                              runparams, basefont,
                                                              last_font);
                        running_font = font;
                        open_font = true;
                        docstring fontchange = ods.str();
                        // check whether the fontchange ends with a \\textcolor
                        // modifier and the text starts with a space (bug 4473)
                        docstring const last_modifier = rsplit(fontchange, '\\');
                        if (prefixIs(last_modifier, from_ascii("textcolor")) && c == ' ')
                                os << fontchange << from_ascii("{}");
                        // check if the fontchange ends with a trailing blank
                        // (like "\small " (see bug 3382)
                        else if (suffixIs(fontchange, ' ') && c == ' ')
                                os << fontchange.substr(0, fontchange.size() - 1)
                                   << from_ascii("{}");
                        else
                                os << fontchange;
                }

                // FIXME: think about end_pos implementation...
                if (c == ' ' && i >= start_pos && (end_pos == -1 || i < end_pos)) {
                        // FIXME: integrate this case in latexSpecialChar
                        // Do not print the separation of the optional argument
                        // if style.pass_thru is false. This works because
                        // latexSpecialChar ignores spaces if
                        // style.pass_thru is false.
                        if (i != body_pos - 1) {
                                if (d->simpleTeXBlanks(runparams, os,
                                                i, column, font, style)) {
                                        // A surrogate pair was output. We
                                        // must not call latexSpecialChar
                                        // in this iteration, since it would output
                                        // the combining character again.
                                        ++i;
                                        continue;
                                }
                        }
                }

                OutputParams rp = runparams;
                rp.free_spacing = style.free_spacing;
                rp.local_font = &font;
                rp.intitle = style.intitle;

                // Two major modes:  LaTeX or plain
                // Handle here those cases common to both modes
                // and then split to handle the two modes separately.
                if (c == META_INSET) {
                        if (i >= start_pos && (end_pos == -1 || i < end_pos)) {
                                d->latexInset(bparams, os, rp, running_font,
                                                basefont, outerfont, open_font,
                                                runningChange, style, i, column);
                        }
                } else {
                        if (i >= start_pos && (end_pos == -1 || i < end_pos)) {
                                try {
                                        d->latexSpecialChar(os, rp, running_font, runningChange,
                                                            style, i, end_pos, column);
                                } catch (EncodingException & e) {
                                if (runparams.dryrun) {
                                        os << "<" << _("LyX Warning: ")
                                           << _("uncodable character") << " '";
                                        os.put(c);
                                        os << "'>";
                                } else {
                                        // add location information and throw again.
                                        e.par_id = id();
                                        e.pos = i;
                                        throw(e);
                                }
                        }
                }
                }

                // Set the encoding to that returned from latexSpecialChar (see
                // comment for encoding member in OutputParams.h)
                runparams.encoding = rp.encoding;
        }

        // If we have an open font definition, we have to close it
        if (open_font) {
#ifdef FIXED_LANGUAGE_END_DETECTION
                if (next_) {
                        running_font.latexWriteEndChanges(os, bparams,
                                        runparams, basefont,
                                        next_->getFont(bparams, 0, outerfont));
                } else {
                        running_font.latexWriteEndChanges(os, bparams,
                                        runparams, basefont, basefont);
                }
#else
//FIXME: For now we ALWAYS have to close the foreign font settings if they are
//FIXME: there as we start another \selectlanguage with the next paragraph if
//FIXME: we are in need of this. This should be fixed sometime (Jug)
                running_font.latexWriteEndChanges(os, bparams, runparams,
                                basefont, basefont);
#endif
        }

        column += Changes::latexMarkChange(os, bparams, runningChange,
                                           Change(Change::UNCHANGED), runparams);

        // Needed if there is an optional argument but no contents.
        if (body_pos > 0 && body_pos == size()) {
                os << "}]~";
        }

        if (allowcust && d->endTeXParParams(bparams, os, runparams)
            && runparams.encoding != prev_encoding) {
                runparams.encoding = prev_encoding;
                if (!runparams.isFullUnicode())
                        os << setEncoding(prev_encoding->iconvName());
        }

        LYXERR(Debug::LATEX, "Paragraph::latex... done " << this);
}


bool Paragraph::emptyTag() const
{
        for (pos_type i = 0; i < size(); ++i) {
                if (Inset const * inset = getInset(i)) {
                        InsetCode lyx_code = inset->lyxCode();
                        // FIXME testing like that is wrong. What is
                        // the intent?
                        if (lyx_code != TOC_CODE &&
                            lyx_code != INCLUDE_CODE &&
                            lyx_code != GRAPHICS_CODE &&
                            lyx_code != ERT_CODE &&
                            lyx_code != LISTINGS_CODE &&
                            lyx_code != FLOAT_CODE &&
                            lyx_code != TABULAR_CODE) {
                                return false;
                        }
                } else {
                        char_type c = d->text_[i];
                        if (c != ' ' && c != '\t')
                                return false;
                }
        }
        return true;
}


string Paragraph::getID(Buffer const & buf, OutputParams const & runparams)
        const
{
        for (pos_type i = 0; i < size(); ++i) {
                if (Inset const * inset = getInset(i)) {
                        InsetCode lyx_code = inset->lyxCode();
                        if (lyx_code == LABEL_CODE) {
                                InsetLabel const * const il = static_cast<InsetLabel const *>(inset);
                                docstring const & id = il->getParam("name");
                                return "id='" + to_utf8(sgml::cleanID(buf, runparams, id)) + "'";
                        }
                }
        }
        return string();
}


pos_type Paragraph::firstWordDocBook(odocstream & os, OutputParams const & runparams)
        const
{
        pos_type i;
        for (i = 0; i < size(); ++i) {
                if (Inset const * inset = getInset(i)) {
                        inset->docbook(os, runparams);
                } else {
                        char_type c = d->text_[i];
                        if (c == ' ')
                                break;
                        os << sgml::escapeChar(c);
                }
        }
        return i;
}


pos_type Paragraph::firstWordLyXHTML(XHTMLStream & xs, OutputParams const & runparams)
        const
{
        pos_type i;
        for (i = 0; i < size(); ++i) {
                if (Inset const * inset = getInset(i)) {
                        inset->xhtml(xs, runparams);
                } else {
                        char_type c = d->text_[i];
                        if (c == ' ')
                                break;
                        xs << c;
                }
        }
        return i;
}


bool Paragraph::Private::onlyText(Buffer const & buf, Font const & outerfont, pos_type initial) const
{
        Font font_old;
        pos_type size = text_.size();
        for (pos_type i = initial; i < size; ++i) {
                Font font = owner_->getFont(buf.params(), i, outerfont);
                if (text_[i] == META_INSET)
                        return false;
                if (i != initial && font != font_old)
                        return false;
                font_old = font;
        }

        return true;
}


void Paragraph::simpleDocBookOnePar(Buffer const & buf,
                                    odocstream & os,
                                    OutputParams const & runparams,
                                    Font const & outerfont,
                                    pos_type initial) const
{
        bool emph_flag = false;

        Layout const & style = *d->layout_;
        FontInfo font_old =
                style.labeltype == LABEL_MANUAL ? style.labelfont : style.font;

        if (style.pass_thru && !d->onlyText(buf, outerfont, initial))
                os << "]]>";

        // parsing main loop
        for (pos_type i = initial; i < size(); ++i) {
                Font font = getFont(buf.params(), i, outerfont);

                // handle <emphasis> tag
                if (font_old.emph() != font.fontInfo().emph()) {
                        if (font.fontInfo().emph() == FONT_ON) {
                                os << "<emphasis>";
                                emph_flag = true;
                        } else if (i != initial) {
                                os << "</emphasis>";
                                emph_flag = false;
                        }
                }

                if (Inset const * inset = getInset(i)) {
                        inset->docbook(os, runparams);
                } else {
                        char_type c = d->text_[i];

                        if (style.pass_thru)
                                os.put(c);
                        else
                                os << sgml::escapeChar(c);
                }
                font_old = font.fontInfo();
        }

        if (emph_flag) {
                os << "</emphasis>";
        }

        if (style.free_spacing)
                os << '\n';
        if (style.pass_thru && !d->onlyText(buf, outerfont, initial))
                os << "<![CDATA[";
}


docstring Paragraph::simpleLyXHTMLOnePar(Buffer const & buf,
                                    XHTMLStream & xs,
                                    OutputParams const & runparams,
                                    Font const & outerfont,
                                    pos_type initial) const
{
        docstring retval;

        bool emph_flag = false;
        bool bold_flag = false;

        Layout const & style = *d->layout_;

        xs.startParagraph(allowEmpty());

        if (!runparams.for_toc && runparams.html_make_pars) {
                // generate a magic label for this paragraph
                string const attr = "id='" + magicLabel() + "'";
                xs << html::CompTag("a", attr);
        }

        FontInfo font_old =
                style.labeltype == LABEL_MANUAL ? style.labelfont : style.font;

        // parsing main loop
        for (pos_type i = initial; i < size(); ++i) {
                // let's not show deleted material in the output
                if (isDeleted(i))
                        continue;

                Font font = getFont(buf.params(), i, outerfont);

                // emphasis
                if (font_old.emph() != font.fontInfo().emph()) {
                        if (font.fontInfo().emph() == FONT_ON) {
                                xs << html::StartTag("em");
                                emph_flag = true;
                        } else if (emph_flag && i != initial) {
                                xs << html::EndTag("em");
                                emph_flag = false;
                        }
                }
                // bold
                if (font_old.series() != font.fontInfo().series()) {
                        if (font.fontInfo().series() == BOLD_SERIES) {
                                xs << html::StartTag("strong");
                                bold_flag = true;
                        } else if (bold_flag && i != initial) {
                                xs << html::EndTag("strong");
                                bold_flag = false;
                        }
                }
                // FIXME XHTML
                // Other such tags? What about the other text ranges?

                Inset const * inset = getInset(i);
                if (inset) {
                        if (!runparams.for_toc || inset->isInToc()) {
                                OutputParams np = runparams;
                                if (!inset->getLayout().htmlisblock())
                                        np.html_in_par = true;
                                retval += inset->xhtml(xs, np);
                        }
                } else {
                        char_type c = d->text_[i];

                        if (style.pass_thru)
                                xs << c;
                        else if (c == '-') {
                                docstring str;
                                int j = i + 1;
                                if (j < size() && d->text_[j] == '-') {
                                        j += 1;
                                        if (j < size() && d->text_[j] == '-') {
                                                str += from_ascii("&mdash;");
                                                i += 2;
                                        } else {
                                                str += from_ascii("&ndash;");
                                                i += 1;
                                        }
                                }
                                else
                                        str += c;
                                // We don't want to escape the entities. Note that
                                // it is safe to do this, since str can otherwise
                                // only be "-". E.g., it can't be "<".
                                xs << XHTMLStream::ESCAPE_NONE << str;
                        } else
                                xs << c;
                }
                font_old = font.fontInfo();
        }

        xs.closeFontTags();
        xs.endParagraph();
        return retval;
}


bool Paragraph::isHfill(pos_type pos) const
{
        Inset const * inset = getInset(pos);
        return inset && (inset->lyxCode() == SPACE_CODE &&
                         inset->isStretchableSpace());
}


bool Paragraph::isNewline(pos_type pos) const
{
        Inset const * inset = getInset(pos);
        return inset && inset->lyxCode() == NEWLINE_CODE;
}


bool Paragraph::isLineSeparator(pos_type pos) const
{
        char_type const c = d->text_[pos];
        if (isLineSeparatorChar(c))
                return true;
        Inset const * inset = getInset(pos);
        return inset && inset->isLineSeparator();
}


bool Paragraph::isWordSeparator(pos_type pos) const
{
        if (pos == size())
                return true;
        if (Inset const * inset = getInset(pos))
                return !inset->isLetter();
        // if we have a hard hyphen (no en- or emdash) or apostrophe
        // we pass this to the spell checker
        // FIXME: this method is subject to change, visit
        // https://bugzilla.mozilla.org/show_bug.cgi?id=355178
        // to get an impression how complex this is.
        if (isHardHyphenOrApostrophe(pos))
                return false;
        char_type const c = d->text_[pos];
        // We want to pass the escape chars to the spellchecker
        docstring const escape_chars = from_utf8(lyxrc.spellchecker_esc_chars);
        return !isLetterChar(c) && !isDigitASCII(c) && !contains(escape_chars, c);
}


bool Paragraph::isHardHyphenOrApostrophe(pos_type pos) const
{
        pos_type const psize = size();
        if (pos >= psize)
                return false;
        char_type const c = d->text_[pos];
        if (c != '-' && c != '\'')
                return false;
        int nextpos = pos + 1;
        int prevpos = pos > 0 ? pos - 1 : 0;
        if ((nextpos == psize || isSpace(nextpos))
                && (pos == 0 || isSpace(prevpos)))
                return false;
        return c == '\''
                || ((nextpos == psize || d->text_[nextpos] != '-')
                && (pos == 0 || d->text_[prevpos] != '-'));
}


bool Paragraph::isSameSpellRange(pos_type pos1, pos_type pos2) const
{
        return pos1 == pos2
                || d->speller_state_.getRange(pos1) == d->speller_state_.getRange(pos2);
}


bool Paragraph::isChar(pos_type pos) const
{
        if (Inset const * inset = getInset(pos))
                return inset->isChar();
        char_type const c = d->text_[pos];
        return !isLetterChar(c) && !isDigitASCII(c) && !lyx::isSpace(c);
}


bool Paragraph::isSpace(pos_type pos) const
{
        if (Inset const * inset = getInset(pos))
                return inset->isSpace();
        char_type const c = d->text_[pos];
        return lyx::isSpace(c);
}


Language const *
Paragraph::getParLanguage(BufferParams const & bparams) const
{
        if (!empty())
                return getFirstFontSettings(bparams).language();
        // FIXME: we should check the prev par as well (Lgb)
        return bparams.language;
}


bool Paragraph::isRTL(BufferParams const & bparams) const
{
        return lyxrc.rtl_support
                && getParLanguage(bparams)->rightToLeft()
                && !inInset().getLayout().forceLTR();
}


void Paragraph::changeLanguage(BufferParams const & bparams,
                               Language const * from, Language const * to)
{
        // change language including dummy font change at the end
        for (pos_type i = 0; i <= size(); ++i) {
                Font font = getFontSettings(bparams, i);
                if (font.language() == from) {
                        font.setLanguage(to);
                        setFont(i, font);
                        d->requestSpellCheck(i);
                }
        }
}


bool Paragraph::isMultiLingual(BufferParams const & bparams) const
{
        Language const * doc_language = bparams.language;
        FontList::const_iterator cit = d->fontlist_.begin();
        FontList::const_iterator end = d->fontlist_.end();

        for (; cit != end; ++cit)
                if (cit->font().language() != ignore_language &&
                    cit->font().language() != latex_language &&
                    cit->font().language() != doc_language)
                        return true;
        return false;
}


void Paragraph::getLanguages(std::set<Language const *> & languages) const
{
        FontList::const_iterator cit = d->fontlist_.begin();
        FontList::const_iterator end = d->fontlist_.end();

        for (; cit != end; ++cit) {
                Language const * lang = cit->font().language();
                if (lang != ignore_language &&
                    lang != latex_language)
                        languages.insert(lang);
        }
}


docstring Paragraph::asString(int options) const
{
        return asString(0, size(), options);
}


docstring Paragraph::asString(pos_type beg, pos_type end, int options) const
{
        odocstringstream os;

        if (beg == 0
            && options & AS_STR_LABEL
            && !d->params_.labelString().empty())
                os << d->params_.labelString() << ' ';

        for (pos_type i = beg; i < end; ++i) {
                if ((options & AS_STR_SKIPDELETE) && isDeleted(i))
                        continue;
                char_type const c = d->text_[i];
                if (isPrintable(c) || c == '\t'
                    || (c == '\n' && (options & AS_STR_NEWLINES)))
                        os.put(c);
                else if (c == META_INSET && (options & AS_STR_INSETS)) {
                        getInset(i)->toString(os);
                        if (getInset(i)->asInsetMath())
                                os << " ";
                }
        }

        return os.str();
}


void Paragraph::forToc(docstring & os, size_t maxlen) const
{
        if (!d->params_.labelString().empty())
                os += d->params_.labelString() + ' ';
        for (pos_type i = 0; i < size() && os.length() < maxlen; ++i) {
                if (isDeleted(i))
                        continue;
                char_type const c = d->text_[i];
                if (isPrintable(c))
                        os += c;
                else if (c == '\t' || c == '\n')
                        os += ' ';
                else if (c == META_INSET)
                        getInset(i)->forToc(os, maxlen);
        }
}


docstring Paragraph::stringify(pos_type beg, pos_type end, int options, OutputParams & runparams) const
{
        odocstringstream os;

        if (beg == 0
                && options & AS_STR_LABEL
                && !d->params_.labelString().empty())
                os << d->params_.labelString() << ' ';

        for (pos_type i = beg; i < end; ++i) {
                char_type const c = d->text_[i];
                if (isPrintable(c) || c == '\t'
                    || (c == '\n' && (options & AS_STR_NEWLINES)))
                        os.put(c);
                else if (c == META_INSET && (options & AS_STR_INSETS)) {
                        getInset(i)->plaintext(os, runparams);
                }
        }

        return os.str();
}


void Paragraph::setInsetOwner(Inset const * inset)
{
        d->inset_owner_ = inset;
}


int Paragraph::id() const
{
        return d->id_;
}


void Paragraph::setId(int id)
{
        d->id_ = id;
}


Layout const & Paragraph::layout() const
{
        return *d->layout_;
}


void Paragraph::setLayout(Layout const & layout)
{
        d->layout_ = &layout;
}


void Paragraph::setDefaultLayout(DocumentClass const & tc)
{
        setLayout(tc.defaultLayout());
}


void Paragraph::setPlainLayout(DocumentClass const & tc)
{
        setLayout(tc.plainLayout());
}


void Paragraph::setPlainOrDefaultLayout(DocumentClass const & tclass)
{
        if (usePlainLayout())
                setPlainLayout(tclass);
        else
                setDefaultLayout(tclass);
}


Inset const & Paragraph::inInset() const
{
        LASSERT(d->inset_owner_, throw ExceptionMessage(BufferException,
                _("Memory problem"), _("Paragraph not properly initialized")));
        return *d->inset_owner_;
}


ParagraphParameters & Paragraph::params()
{
        return d->params_;
}


ParagraphParameters const & Paragraph::params() const
{
        return d->params_;
}


bool Paragraph::isFreeSpacing() const
{
        if (d->layout_->free_spacing)
                return true;
        return d->inset_owner_ && d->inset_owner_->isFreeSpacing();
}


bool Paragraph::allowEmpty() const
{
        if (d->layout_->keepempty)
                return true;
        return d->inset_owner_ && d->inset_owner_->allowEmpty();
}


char_type Paragraph::transformChar(char_type c, pos_type pos) const
{
        if (!Encodings::isArabicChar(c))
                return c;

        char_type prev_char = ' ';
        char_type next_char = ' ';

        for (pos_type i = pos - 1; i >= 0; --i) {
                char_type const par_char = d->text_[i];
                if (!Encodings::isArabicComposeChar(par_char)) {
                        prev_char = par_char;
                        break;
                }
        }

        for (pos_type i = pos + 1, end = size(); i < end; ++i) {
                char_type const par_char = d->text_[i];
                if (!Encodings::isArabicComposeChar(par_char)) {
                        next_char = par_char;
                        break;
                }
        }

        if (Encodings::isArabicChar(next_char)) {
                if (Encodings::isArabicChar(prev_char) &&
                        !Encodings::isArabicSpecialChar(prev_char))
                        return Encodings::transformChar(c, Encodings::FORM_MEDIAL);
                else
                        return Encodings::transformChar(c, Encodings::FORM_INITIAL);
        } else {
                if (Encodings::isArabicChar(prev_char) &&
                        !Encodings::isArabicSpecialChar(prev_char))
                        return Encodings::transformChar(c, Encodings::FORM_FINAL);
                else
                        return Encodings::transformChar(c, Encodings::FORM_ISOLATED);
        }
}


int Paragraph::checkBiblio(Buffer const & buffer)
{
        // FIXME From JS:
        // This is getting more and more a mess. ...We really should clean
        // up this bibitem issue for 1.6.

        // Add bibitem insets if necessary
        if (d->layout_->labeltype != LABEL_BIBLIO)
                return 0;

        bool hasbibitem = !d->insetlist_.empty()
                // Insist on it being in pos 0
                && d->text_[0] == META_INSET
                && d->insetlist_.begin()->inset->lyxCode() == BIBITEM_CODE;

        bool track_changes = buffer.params().trackChanges;

        docstring oldkey;
        docstring oldlabel;

        // remove a bibitem in pos != 0
        // restore it later in pos 0 if necessary
        // (e.g. if a user inserts contents _before_ the item)
        // we're assuming there's only one of these, which there
        // should be.
        int erasedInsetPosition = -1;
        InsetList::iterator it = d->insetlist_.begin();
        InsetList::iterator end = d->insetlist_.end();
        for (; it != end; ++it)
                if (it->inset->lyxCode() == BIBITEM_CODE
                      && it->pos > 0) {
                        InsetCommand * olditem = it->inset->asInsetCommand();
                        oldkey = olditem->getParam("key");
                        oldlabel = olditem->getParam("label");
                        erasedInsetPosition = it->pos;
                        eraseChar(erasedInsetPosition, track_changes);
                        break;
        }

        // There was an InsetBibitem at the beginning, and we didn't
        // have to erase one.
        if (hasbibitem && erasedInsetPosition < 0)
                        return 0;

        // There was an InsetBibitem at the beginning and we did have to
        // erase one. So we give its properties to the beginning inset.
        if (hasbibitem) {
                InsetCommand * inset = d->insetlist_.begin()->inset->asInsetCommand();
                if (!oldkey.empty())
                        inset->setParam("key", oldkey);
                inset->setParam("label", oldlabel);
                return -erasedInsetPosition;
        }

        // There was no inset at the beginning, so we need to create one with
        // the key and label of the one we erased.
        InsetBibitem * inset =
                new InsetBibitem(const_cast<Buffer *>(&buffer), InsetCommandParams(BIBITEM_CODE));
        // restore values of previously deleted item in this par.
        if (!oldkey.empty())
                inset->setParam("key", oldkey);
        inset->setParam("label", oldlabel);
        insertInset(0, inset,
                    Change(track_changes ? Change::INSERTED : Change::UNCHANGED));

        return 1;
}


void Paragraph::checkAuthors(AuthorList const & authorList)
{
        d->changes_.checkAuthors(authorList);
}


bool Paragraph::isChanged(pos_type pos) const
{
        return lookupChange(pos).changed();
}


bool Paragraph::isInserted(pos_type pos) const
{
        return lookupChange(pos).inserted();
}


bool Paragraph::isDeleted(pos_type pos) const
{
        return lookupChange(pos).deleted();
}


InsetList const & Paragraph::insetList() const
{
        return d->insetlist_;
}


void Paragraph::setBuffer(Buffer & b)
{
        d->insetlist_.setBuffer(b);
}


Inset * Paragraph::releaseInset(pos_type pos)
{
        Inset * inset = d->insetlist_.release(pos);
        /// does not honour change tracking!
        eraseChar(pos, false);
        return inset;
}


Inset * Paragraph::getInset(pos_type pos)
{
        return (pos < pos_type(d->text_.size()) && d->text_[pos] == META_INSET)
                 ? d->insetlist_.get(pos) : 0;
}


Inset const * Paragraph::getInset(pos_type pos) const
{
        return (pos < pos_type(d->text_.size()) && d->text_[pos] == META_INSET)
                 ? d->insetlist_.get(pos) : 0;
}


void Paragraph::changeCase(BufferParams const & bparams, pos_type pos,
                pos_type & right, TextCase action)
{
        // process sequences of modified characters; in change
        // tracking mode, this approach results in much better
        // usability than changing case on a char-by-char basis
        docstring changes;

        bool const trackChanges = bparams.trackChanges;

        bool capitalize = true;

        for (; pos < right; ++pos) {
                char_type oldChar = d->text_[pos];
                char_type newChar = oldChar;

                // ignore insets and don't play with deleted text!
                if (oldChar != META_INSET && !isDeleted(pos)) {
                        switch (action) {
                                case text_lowercase:
                                        newChar = lowercase(oldChar);
                                        break;
                                case text_capitalization:
                                        if (capitalize) {
                                                newChar = uppercase(oldChar);
                                                capitalize = false;
                                        }
                                        break;
                                case text_uppercase:
                                        newChar = uppercase(oldChar);
                                        break;
                        }
                }

                if (isWordSeparator(pos) || isDeleted(pos)) {
                        // permit capitalization again
                        capitalize = true;
                }

                if (oldChar != newChar) {
                        changes += newChar;
                        if (pos != right - 1)
                                continue;
                        // step behind the changing area
                        pos++;
                }

                int erasePos = pos - changes.size();
                for (size_t i = 0; i < changes.size(); i++) {
                        insertChar(pos, changes[i],
                                   getFontSettings(bparams,
                                                   erasePos),
                                   trackChanges);
                        if (!eraseChar(erasePos, trackChanges)) {
                                ++erasePos;
                                ++pos; // advance
                                ++right; // expand selection
                        }
                }
                changes.clear();
        }
}


int Paragraph::find(docstring const & str, bool cs, bool mw,
                pos_type start_pos, bool del) const
{
        pos_type pos = start_pos;
        int const strsize = str.length();
        int i = 0;
        pos_type const parsize = d->text_.size();
        for (i = 0; i < strsize && pos < parsize; ++i, ++pos) {
                // Ignore "invisible" letters such as ligature breaks
                // and hyphenation chars while searching
                while (pos < parsize - 1 && isInset(pos)) {
                        odocstringstream os;
                        getInset(pos)->toString(os);
                        if (!getInset(pos)->isLetter() || !os.str().empty())
                                break;
                        pos++;
                }
                if (cs && str[i] != d->text_[pos])
                        break;
                if (!cs && uppercase(str[i]) != uppercase(d->text_[pos]))
                        break;
                if (!del && isDeleted(pos))
                        break;
        }

        if (i != strsize)
                return 0;

        // if necessary, check whether string matches word
        if (mw) {
                if (start_pos > 0 && !isWordSeparator(start_pos - 1))
                        return 0;
                if (pos < parsize
                        && !isWordSeparator(pos))
                        return 0;
        }

        return pos - start_pos;
}


char_type Paragraph::getChar(pos_type pos) const
{
        return d->text_[pos];
}


pos_type Paragraph::size() const
{
        return d->text_.size();
}


bool Paragraph::empty() const
{
        return d->text_.empty();
}


bool Paragraph::isInset(pos_type pos) const
{
        return d->text_[pos] == META_INSET;
}


bool Paragraph::isSeparator(pos_type pos) const
{
        //FIXME: Are we sure this can be the only separator?
        return d->text_[pos] == ' ';
}


void Paragraph::deregisterWords()
{
        Private::LangWordsMap::const_iterator itl = d->words_.begin();
        Private::LangWordsMap::const_iterator ite = d->words_.end();
        for (; itl != ite; ++itl) {
                WordList * wl = theWordList(itl->first);
                Private::Words::const_iterator it = (itl->second).begin();
                Private::Words::const_iterator et = (itl->second).end();
                for (; it != et; ++it)
                        wl->remove(*it);
        }
        d->words_.clear();
}


void Paragraph::locateWord(pos_type & from, pos_type & to,
        word_location const loc) const
{
        switch (loc) {
        case WHOLE_WORD_STRICT:
                if (from == 0 || from == size()
                    || isWordSeparator(from)
                    || isWordSeparator(from - 1)) {
                        to = from;
                        return;
                }
                // no break here, we go to the next

        case WHOLE_WORD:
                // If we are already at the beginning of a word, do nothing
                if (!from || isWordSeparator(from - 1))
                        break;
                // no break here, we go to the next

        case PREVIOUS_WORD:
                // always move the cursor to the beginning of previous word
                while (from && !isWordSeparator(from - 1))
                        --from;
                break;
        case NEXT_WORD:
                LYXERR0("Paragraph::locateWord: NEXT_WORD not implemented yet");
                break;
        case PARTIAL_WORD:
                // no need to move the 'from' cursor
                break;
        }
        to = from;
        while (to < size() && !isWordSeparator(to))
                ++to;
}


void Paragraph::collectWords()
{
        pos_type n = size();
        for (pos_type pos = 0; pos < n; ++pos) {
                if (isWordSeparator(pos))
                        continue;
                pos_type from = pos;
                locateWord(from, pos, WHOLE_WORD);
                if ((pos - from) >= (int)lyxrc.completion_minlength) {
                        docstring word = asString(from, pos, AS_STR_NONE);
                        FontList::const_iterator cit = d->fontlist_.fontIterator(pos);
                        if (cit == d->fontlist_.end())
                                return;
                        Language const * lang = cit->font().language();
                        d->words_[*lang].insert(word);
                }
        }
}


void Paragraph::registerWords()
{
        Private::LangWordsMap::const_iterator itl = d->words_.begin();
        Private::LangWordsMap::const_iterator ite = d->words_.end();
        for (; itl != ite; ++itl) {
                WordList * wl = theWordList(itl->first);
                Private::Words::const_iterator it = (itl->second).begin();
                Private::Words::const_iterator et = (itl->second).end();
                for (; it != et; ++it)
                        wl->insert(*it);
        }
}


void Paragraph::updateWords()
{
        deregisterWords();
        collectWords();
        registerWords();
}


void Paragraph::Private::appendSkipPosition(SkipPositions & skips, pos_type const pos) const
{
        SkipPositionsIterator begin = skips.begin();
        SkipPositions::iterator end = skips.end();
        if (pos > 0 && begin < end) {
                --end;
                if (end->last == pos - 1) {
                        end->last = pos;
                        return;
                }
        }
        skips.insert(end, FontSpan(pos, pos));
}


Language * Paragraph::Private::locateSpellRange(
        pos_type & from, pos_type & to,
        SkipPositions & skips) const
{
        // skip leading white space
        while (from < to && owner_->isWordSeparator(from))
                ++from;
        // don't check empty range
        if (from >= to)
                return 0;
        // get current language
        Language * lang = getSpellLanguage(from);
        pos_type last = from;
        bool samelang = true;
        bool sameinset = true;
        while (last < to && samelang && sameinset) {
                // hop to end of word
                while (last < to && !owner_->isWordSeparator(last)) {
                        if (owner_->getInset(last)) {
                                appendSkipPosition(skips, last);
                        } else if (owner_->isDeleted(last)) {
                                appendSkipPosition(skips, last);
                        }
                        ++last;
                }
                // hop to next word while checking for insets
                while (sameinset && last < to && owner_->isWordSeparator(last)) {
                        if (Inset const * inset = owner_->getInset(last))
                                sameinset = inset->isChar() && inset->isLetter();
                        if (sameinset && owner_->isDeleted(last)) {
                                appendSkipPosition(skips, last);
                        }
                        if (sameinset)
                                last++;
                }
                if (sameinset && last < to) {
                        // now check for language change
                        samelang = lang == getSpellLanguage(last);
                }
        }
        // if language change detected backstep is needed
        if (!samelang)
                --last;
        to = last;
        return lang;
}


Language * Paragraph::Private::getSpellLanguage(pos_type const from) const
{
        Language * lang =
                const_cast<Language *>(owner_->getFontSettings(
                        inset_owner_->buffer().params(), from).language());
        if (lang == inset_owner_->buffer().params().language
                && !lyxrc.spellchecker_alt_lang.empty()) {
                string lang_code;
                string const lang_variety =
                        split(lyxrc.spellchecker_alt_lang, lang_code, '-');
                lang->setCode(lang_code);
                lang->setVariety(lang_variety);
        }
        return lang;
}


void Paragraph::requestSpellCheck(pos_type pos)
{
        d->requestSpellCheck(pos);
}


bool Paragraph::needsSpellCheck() const
{
        SpellChecker::ChangeNumber speller_change_number = 0;
        if (theSpellChecker())
                speller_change_number = theSpellChecker()->changeNumber();
        if (speller_change_number > d->speller_state_.currentChangeNumber()) {
                d->speller_state_.needsCompleteRefresh(speller_change_number);
        }
        return d->needsSpellCheck();
}


bool Paragraph::Private::ignoreWord(docstring const & word) const
{
        // Ignore words with digits
        // FIXME: make this customizable
        // (note that some checkers ignore words with digits by default)
        docstring::const_iterator cit = word.begin();
        docstring::const_iterator const end = word.end();
        for (; cit != end; ++cit) {
                if (isNumber((*cit)))
                        return true;
        }
        return false;
}


SpellChecker::Result Paragraph::spellCheck(pos_type & from, pos_type & to,
        WordLangTuple & wl, docstring_list & suggestions,
        bool do_suggestion, bool check_learned) const
{
        SpellChecker::Result result = SpellChecker::WORD_OK;
        SpellChecker * speller = theSpellChecker();
        if (!speller)
                return result;

        if (!d->layout_->spellcheck || !inInset().allowSpellCheck())
                return result;

        locateWord(from, to, WHOLE_WORD);
        if (from == to || from >= size())
                return result;

        docstring word = asString(from, to, AS_STR_INSETS | AS_STR_SKIPDELETE);
        Language * lang = d->getSpellLanguage(from);

        wl = WordLangTuple(word, lang);

        if (!word.size())
                return result;

        if (needsSpellCheck() || check_learned) {
                pos_type end = to;
                if (!d->ignoreWord(word)) {
                        bool const trailing_dot = to < size() && d->text_[to] == '.';
                        result = speller->check(wl);
                        if (SpellChecker::misspelled(result) && trailing_dot) {
                                wl = WordLangTuple(word.append(from_ascii(".")), lang);
                                result = speller->check(wl);
                                if (!SpellChecker::misspelled(result)) {
                                        LYXERR(Debug::GUI, "misspelled word is correct with dot: \"" <<
                                           word << "\" [" <<
                                           from << ".." << to << "]");
                                } else {
                                        // spell check with dot appended failed too
                                        // restore original word/lang value
                                        word = asString(from, to, AS_STR_INSETS | AS_STR_SKIPDELETE);
                                        wl = WordLangTuple(word, lang);
                                }
                        }
                }
                if (!SpellChecker::misspelled(result)) {
                        // area up to the begin of the next word is not misspelled
                        while (end < size() && isWordSeparator(end))
                                ++end;
                }
                d->setMisspelled(from, end, result);
        } else {
                result = d->speller_state_.getState(from);
        }

        if (do_suggestion)
                suggestions.clear();

        if (SpellChecker::misspelled(result)) {
                LYXERR(Debug::GUI, "misspelled word: \"" <<
                           word << "\" [" <<
                           from << ".." << to << "]");
                if (do_suggestion)
                        speller->suggest(wl, suggestions);
        }
        return result;
}


void Paragraph::Private::markMisspelledWords(
        pos_type const & first, pos_type const & last,
        SpellChecker::Result result,
        docstring const & word,
        SkipPositions const & skips)
{
        if (!SpellChecker::misspelled(result)) {
                setMisspelled(first, last, SpellChecker::WORD_OK);
                return;
        }
        int snext = first;
        SpellChecker * speller = theSpellChecker();
        // locate and enumerate the error positions
        int nerrors = speller->numMisspelledWords();
        int numskipped = 0;
        SkipPositionsIterator it = skips.begin();
        SkipPositionsIterator et = skips.end();
        for (int index = 0; index < nerrors; ++index) {
                int wstart;
                int wlen = 0;
                speller->misspelledWord(index, wstart, wlen);
                /// should not happen if speller supports range checks
                if (!wlen) continue;
                docstring const misspelled = word.substr(wstart, wlen);
                wstart += first + numskipped;
                if (snext < wstart) {
                        /// mark the range of correct spelling
                        numskipped += countSkips(it, et, wstart);
                        setMisspelled(snext,
                                wstart - 1, SpellChecker::WORD_OK);
                }
                snext = wstart + wlen;
                numskipped += countSkips(it, et, snext);
                /// mark the range of misspelling
                setMisspelled(wstart, snext, result);
                LYXERR(Debug::GUI, "misspelled word: \"" <<
                           misspelled << "\" [" <<
                           wstart << ".." << (snext-1) << "]");
                ++snext;
        }
        if (snext <= last) {
                /// mark the range of correct spelling at end
                setMisspelled(snext, last, SpellChecker::WORD_OK);
        }
}


void Paragraph::spellCheck() const
{
        SpellChecker * speller = theSpellChecker();
        if (!speller || !size() ||!needsSpellCheck())
                return;
        pos_type start;
        pos_type endpos;
        d->rangeOfSpellCheck(start, endpos);
        if (speller->canCheckParagraph()) {
                // loop until we leave the range
                for (pos_type first = start; first < endpos; ) {
                        pos_type last = endpos;
                        Private::SkipPositions skips;
                        Language * lang = d->locateSpellRange(first, last, skips);
                        if (first >= endpos)
                                break;
                        // start the spell checker on the unit of meaning
                        docstring word = asString(first, last, AS_STR_INSETS + AS_STR_SKIPDELETE);
                        WordLangTuple wl = WordLangTuple(word, lang);
                        SpellChecker::Result result = word.size() ?
                                speller->check(wl) : SpellChecker::WORD_OK;
                        d->markMisspelledWords(first, last, result, word, skips);
                        first = ++last;
                }
        } else {
                static docstring_list suggestions;
                pos_type to = endpos;
                while (start < endpos) {
                        WordLangTuple wl;
                        spellCheck(start, to, wl, suggestions, false);
                        start = to + 1;
                }
        }
        d->readySpellCheck();
}


bool Paragraph::isMisspelled(pos_type pos, bool check_boundary) const
{
        bool result = SpellChecker::misspelled(d->speller_state_.getState(pos));
        if (result || pos <= 0 || pos > size())
                return result;
        if (check_boundary && (pos == size() || isWordSeparator(pos)))
                result = SpellChecker::misspelled(d->speller_state_.getState(pos - 1));
        return result;
}


string Paragraph::magicLabel() const
{
        stringstream ss;
        ss << "magicparlabel-" << id();
        return ss.str();
}


} // namespace lyx