]> git.lyx.org Git - lyx.git/blobdiff - src/output_latex.cpp
Do not overwrite read-only files. We now move the file to the backup directory and...
[lyx.git] / src / output_latex.cpp
index 164d8886acc37e77efade9ce08fa24ec7d4f4616..a2013706df538275156e1b602a949254ded6d027 100644 (file)
@@ -3,7 +3,7 @@
  * This file is part of LyX, the document processor.
  * Licence details can be found in the file COPYING.
  *
- * \author Lars Gullik Bjønnes
+ * \author Lars Gullik Bjønnes
  *
  * Full author contact details are available in file CREDITS.
  */
 #include "Buffer.h"
 #include "BufferParams.h"
 #include "Encoding.h"
+#include "Font.h"
 #include "InsetList.h"
 #include "Language.h"
 #include "Layout.h"
 #include "LyXRC.h"
 #include "OutputParams.h"
 #include "Paragraph.h"
-#include "paragraph_funcs.h"
 #include "ParagraphParameters.h"
 #include "TextClass.h"
 #include "TexRow.h"
 #include "VSpace.h"
 
 #include "insets/InsetBibitem.h"
-#include "insets/InsetOptArg.h"
+#include "insets/InsetArgument.h"
 
 #include "support/lassert.h"
 #include "support/debug.h"
 #include "support/lstrings.h"
 
 #include <boost/next_prior.hpp>
+#include <list>
 
 using namespace std;
 using namespace lyx::support;
@@ -52,6 +53,7 @@ enum OpenEncoding {
 
 static int open_encoding_ = none;
 static int cjk_inherited_ = 0;
+Language const * prev_env_language_ = 0;
 
 
 ParagraphList::const_iterator
@@ -61,14 +63,6 @@ TeXEnvironment(Buffer const & buf,
               odocstream & os, TexRow & texrow,
               OutputParams const & runparams);
 
-ParagraphList::const_iterator
-TeXOnePar(Buffer const & buf,
-         Text const & text,
-         ParagraphList::const_iterator pit,
-         odocstream & os, TexRow & texrow,
-         OutputParams const & runparams,
-         string const & everypar = string());
-
 
 ParagraphList::const_iterator
 TeXDeeper(Buffer const & buf,
@@ -82,13 +76,13 @@ TeXDeeper(Buffer const & buf,
 
        ParagraphList const & paragraphs = text.paragraphs();
 
-       // FIXME This test should not be necessary.
-       // We should perhaps issue an error if it is.
-       Layout const & style = par->forcePlainLayout() ?
-               buf.params().documentClass().plainLayout() : par->layout();
-
+       bool const force_plain_layout = text.inset().forcePlainLayout();
        while (par != paragraphs.end() &&
-                    par->params().depth() == pit->params().depth()) {
+                                       par->params().depth() == pit->params().depth()) {
+               // FIXME This test should not be necessary.
+               // We should perhaps issue an error if it is.
+               Layout const & style = force_plain_layout
+                       ? buf.params().documentClass().plainLayout() : par->layout();
                if (style.isEnvironment()) {
                        par = TeXEnvironment(buf, text, par,
                                             os, texrow, runparams);
@@ -103,6 +97,16 @@ TeXDeeper(Buffer const & buf,
 }
 
 
+string const getPolyglossiaEnvName(Language const * lang)
+{
+       string result = lang->polyglossia();
+       if (result == "arabic")
+               // exceptional spelling; see polyglossia docs.
+               result = "Arabic";
+       return result;
+}
+
+
 ParagraphList::const_iterator
 TeXEnvironment(Buffer const & buf,
               Text const & text,
@@ -116,40 +120,68 @@ TeXEnvironment(Buffer const & buf,
 
        // FIXME This test should not be necessary.
        // We should perhaps issue an error if it is.
-       Layout const & style = pit->forcePlainLayout() ?
+       Layout const & style = text.inset().forcePlainLayout() ?
                bparams.documentClass().plainLayout() : pit->layout();
 
        ParagraphList const & paragraphs = text.paragraphs();
+       ParagraphList::const_iterator const priorpit =
+               pit == paragraphs.begin() ? pit : boost::prior(pit);
 
+       bool const use_prev_env_language = prev_env_language_ != 0
+                       && priorpit->layout().isEnvironment()
+                       && (priorpit->getDepth() > pit->getDepth()
+                           || (priorpit->getDepth() == pit->getDepth()
+                               && priorpit->layout() != pit->layout()));
+
+       Encoding const * const prev_encoding = runparams.encoding;
        Language const * const par_language = pit->getParLanguage(bparams);
        Language const * const doc_language = bparams.language;
        Language const * const prev_par_language =
                (pit != paragraphs.begin())
-               ? boost::prior(pit)->getParLanguage(bparams)
+               ? (use_prev_env_language ? prev_env_language_
+                                        : priorpit->getParLanguage(bparams))
                : doc_language;
-       if (par_language->babel() != prev_par_language->babel()) {
+       string par_lang = par_language->babel();
+       string prev_par_lang = prev_par_language->babel();
+       string doc_lang = doc_language->babel();
+       string lang_begin_command = lyxrc.language_command_begin;
+       string lang_end_command = lyxrc.language_command_end;
+
+       if (runparams.use_polyglossia) {
+               par_lang = getPolyglossiaEnvName(par_language);
+               prev_par_lang = getPolyglossiaEnvName(prev_par_language);
+               doc_lang = getPolyglossiaEnvName(doc_language);
+               lang_begin_command = "\\begin{$$lang}";
+               lang_end_command = "\\end{$$lang}";
+       }
 
-               if (!lyxrc.language_command_end.empty() &&
-                   prev_par_language->babel() != doc_language->babel() &&
-                   !prev_par_language->babel().empty()) {
+       if (par_lang != prev_par_lang) {
+               if (!lang_end_command.empty() &&
+                   prev_par_lang != doc_lang &&
+                   !prev_par_lang.empty()) {
                        os << from_ascii(subst(
-                               lyxrc.language_command_end,
+                               lang_end_command,
                                "$$lang",
-                               prev_par_language->babel()))
-                          // the '%' is necessary to prevent unwanted whitespace
-                          << "%\n";
+                               prev_par_lang))
+                         // the '%' is necessary to prevent unwanted whitespace
+                         << "%\n";
                        texrow.newline();
                }
 
                if ((lyxrc.language_command_end.empty() ||
-                    par_language->babel() != doc_language->babel()) &&
-                   !par_language->babel().empty()) {
+                   par_lang != doc_lang) &&
+                   !par_lang.empty()) {
                        os << from_ascii(subst(
-                               lyxrc.language_command_begin,
+                               lang_begin_command,
                                "$$lang",
-                               par_language->babel()))
-                          // the '%' is necessary to prevent unwanted whitespace
-                          << "%\n";
+                               par_lang));
+                       if (runparams.use_polyglossia
+                           && !par_language->polyglossiaOpts().empty())
+                                       os << "["
+                                          << from_ascii(par_language->polyglossiaOpts())
+                                          << "]";
+                         // the '%' is necessary to prevent unwanted whitespace
+                       os << "%\n";
                        texrow.newline();
                }
        }
@@ -165,9 +197,8 @@ TeXEnvironment(Buffer const & buf,
 
        if (style.isEnvironment()) {
                os << "\\begin{" << from_ascii(style.latexname()) << '}';
-               if (style.optionalargs > 0) {
-                       int ret = latexOptArgInsets(*pit, os, runparams,
-                                                   style.optionalargs);
+               if (style.optargs != 0 || style.reqargs != 0) {
+                       int ret = latexArgInsets(*pit, os, runparams, style.reqargs, style.optargs);
                        while (ret > 0) {
                                texrow.newline();
                                --ret;
@@ -178,8 +209,12 @@ TeXEnvironment(Buffer const & buf,
                           << pit->params().labelWidthString()
                           << "}\n";
                } else if (style.labeltype == LABEL_BIBLIO) {
-                       // ale970405
-                       os << '{' << bibitemWidest(buf) << "}\n";
+                       if (pit->params().labelWidthString().empty())
+                               os << '{' << bibitemWidest(buf, runparams) << "}\n";
+                       else
+                               os << '{'
+                                 << pit->params().labelWidthString()
+                                 << "}\n";
                } else
                        os << from_ascii(style.latexparam()) << '\n';
                texrow.newline();
@@ -189,8 +224,9 @@ TeXEnvironment(Buffer const & buf,
        bool cjk_nested = false;
        if (par_language->encoding()->package() == Encoding::CJK &&
            open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
-               os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
-                  << "}{" << from_ascii(bparams.fontsCJK) << "}%\n";
+               if (prev_par_language->encoding()->package() == Encoding::CJK)
+                       os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
+                          << "}{" << from_ascii(bparams.fontsCJK) << "}%\n";
                open_encoding_ = CJK;
                cjk_nested = true;
                texrow.newline();
@@ -244,11 +280,23 @@ TeXEnvironment(Buffer const & buf,
        if (style.isEnvironment()) {
                os << "\\end{" << from_ascii(style.latexname()) << "}\n";
                texrow.newline();
+               prev_env_language_ = par_language;
+               if (runparams.encoding != prev_encoding) {
+                       runparams.encoding = prev_encoding;
+                       if (!runparams.isFullUnicode())
+                               os << setEncoding(prev_encoding->iconvName());
+               }
        }
 
        if (leftindent_open) {
                os << "\\end{LyXParagraphLeftIndent}\n";
                texrow.newline();
+               prev_env_language_ = par_language;
+               if (runparams.encoding != prev_encoding) {
+                       runparams.encoding = prev_encoding;
+                       if (!runparams.isFullUnicode())
+                               os << setEncoding(prev_encoding->iconvName());
+               }
        }
 
        if (par != paragraphs.end())
@@ -260,79 +308,139 @@ TeXEnvironment(Buffer const & buf,
 } // namespace anon
 
 
-int latexOptArgInsets(Paragraph const & par, odocstream & os,
-       OutputParams const & runparams, int number)
+int latexArgInsets(Paragraph const & par, odocstream & os,
+       OutputParams const & runparams, unsigned int reqargs,
+       unsigned int optargs)
 {
-       int lines = 0;
+       unsigned int totalargs = reqargs + optargs;
+       list<InsetArgument const *> ilist;
 
        InsetList::const_iterator it = par.insetList().begin();
        InsetList::const_iterator end = par.insetList().end();
-       for (; it != end && number > 0 ; ++it) {
-               if (it->inset->lyxCode() == OPTARG_CODE) {
-                       InsetOptArg * ins =
-                               static_cast<InsetOptArg *>(it->inset);
-                       lines += ins->latexOptional(os, runparams);
-                       --number;
+       for (; it != end; ++it) {
+               if (it->inset->lyxCode() == ARG_CODE) {
+                       if (ilist.size() >= totalargs) {
+                               LYXERR0("WARNING: Found extra argument inset.");
+                               continue;
+                       }
+                       InsetArgument const * ins =
+                               static_cast<InsetArgument const *>(it->inset);
+                       ilist.push_back(ins);
+               }
+       }
+
+       if (!reqargs && ilist.size() == 0)
+               return 0;
+
+       int lines = 0;
+       bool const have_optional_args = ilist.size() > reqargs;
+       if (have_optional_args) {
+               unsigned int todo = ilist.size() - reqargs;
+               for (unsigned int i = 0; i < todo; ++i) {
+                       InsetArgument const * ins = ilist.front();
+                       ilist.pop_front();
+                       lines += ins->latexArgument(os, runparams, true);
+               }
+       }
+
+       // we should now have no more insets than there are required
+       // arguments.
+       LASSERT(ilist.size() <= reqargs, /* */);
+       if (!reqargs)
+               return lines;
+
+       for (unsigned int i = 0; i < reqargs; ++i) {
+               if (ilist.empty())
+                       // a required argument wasn't given, so we output {}
+                       os << "{}";
+               else {
+                       InsetArgument const * ins = ilist.front();
+                       ilist.pop_front();
+                       lines += ins->latexArgument(os, runparams, false);
                }
        }
        return lines;
 }
 
 
-namespace {
-
-ParagraphList::const_iterator
-TeXOnePar(Buffer const & buf,
+// FIXME: this should be anonymous
+ParagraphList::const_iterator TeXOnePar(Buffer const & buf,
          Text const & text,
          ParagraphList::const_iterator const pit,
          odocstream & os, TexRow & texrow,
          OutputParams const & runparams_in,
-         string const & everypar)
+         string const & everypar,
+         int start_pos, int end_pos)
 {
        LYXERR(Debug::LATEX, "TeXOnePar...     " << &*pit << " '"
                << everypar << "'");
+
        BufferParams const & bparams = buf.params();
+       // FIXME This check should not really be needed.
+       // Perhaps we should issue an error if it is.
+       Layout const style = text.inset().forcePlainLayout() ?
+               bparams.documentClass().plainLayout() : pit->layout();
+
        ParagraphList const & paragraphs = text.paragraphs();
+       ParagraphList::const_iterator const priorpit = 
+               pit == paragraphs.begin() ? pit : boost::prior(pit);
+       ParagraphList::const_iterator const nextpit = 
+               pit == paragraphs.end() ? pit : boost::next(pit);
 
-       ParagraphList::const_iterator priorpit = pit;
-       if (priorpit != paragraphs.begin())
-               --priorpit;
-       ParagraphList::const_iterator nextpit = pit;
-       if (nextpit != paragraphs.end())
-               ++nextpit;
+       if (style.inpreamble)
+               return nextpit;
 
        OutputParams runparams = runparams_in;
        runparams.isLastPar = nextpit == paragraphs.end();
 
-       if (runparams.verbatim) {
+       bool const maintext = text.isMainText();
+       // we are at the beginning of an inset and CJK is already open;
+       // we count inheritation levels to get the inset nesting right.
+       if (pit == paragraphs.begin() && !maintext
+           && (cjk_inherited_ > 0 || open_encoding_ == CJK)) {
+               cjk_inherited_ += 1;
+               open_encoding_ = none;
+       }
+
+       if (text.inset().getLayout().isPassThru()) {
                int const dist = distance(paragraphs.begin(), pit);
-               Font const outerfont = outerFont(dist, paragraphs);
+               Font const outerfont = text.outerFont(dist);
 
-               // No newline if only one paragraph in this lyxtext
+               // No newline before first paragraph in this lyxtext
                if (dist > 0) {
                        os << '\n';
                        texrow.newline();
+                       if (!text.inset().getLayout().parbreakIsNewline()) {
+                               os << '\n';
+                               texrow.newline();
+                       }
                }
 
-               /*bool need_par = */ pit->latex(bparams, outerfont,
-                       os, texrow, runparams);
+               pit->latex(bparams, outerfont, os, texrow,
+                          runparams, start_pos, end_pos);
                return nextpit;
        }
 
-       // FIXME This check should not really be needed.
-       // Perhaps we should issue an error if it is.
-       Layout const style = pit->forcePlainLayout() ?
-               bparams.documentClass().plainLayout() : pit->layout();
-
-       runparams.moving_arg |= style.needprotect;
+       if (style.pass_thru) {
+               int const dist = distance(paragraphs.begin(), pit);
+               Font const outerfont = text.outerFont(dist);
+               pit->latex(bparams, outerfont, os, texrow,
+                          runparams, start_pos, end_pos);
+               os << '\n';
+               texrow.newline();
+               if (!style.parbreak_is_newline) {
+                       os << '\n';
+                       texrow.newline();
+               } else if (nextpit != paragraphs.end()) {
+                       Layout const nextstyle = text.inset().forcePlainLayout() ?
+                               bparams.documentClass().plainLayout() : nextpit->layout();
+                       if (nextstyle.name() != style.name()) {
+                               os << '\n';
+                               texrow.newline();
+                       }
+               }
 
-       bool const maintext = text.isMainText(buf);
-       // we are at the beginning of an inset and CJK is already open;
-       // we count inheritation levels to get the inset nesting right.
-       if (pit == paragraphs.begin() && !maintext
-           && (cjk_inherited_ > 0 || open_encoding_ == CJK)) {
-               cjk_inherited_ += 1;
-               open_encoding_ = none;
+               return nextpit;
        }
 
        // This paragraph's language
@@ -344,14 +452,39 @@ TeXOnePar(Buffer const & buf,
        Language const * const outer_language =
                (runparams.local_font != 0) ?
                        runparams.local_font->language() : doc_language;
-       // The previous language that was in effect is either the language of
-       // the previous paragraph, if there is one, or else the outer language
-       // if there is no previous paragraph
-       Language const * const prev_language =
-               (pit != paragraphs.begin()) ?
-                       priorpit->getParLanguage(bparams) : outer_language;
 
-       if (par_language->babel() != prev_language->babel()
+       // The previous language that was in effect is the language of the
+       // previous paragraph, unless the previous paragraph is inside an
+       // environment with nesting depth greater than (or equal to, but with
+       // a different layout) the current one. If there is no previous
+       // paragraph, the previous language is the outer language.
+       bool const use_prev_env_language = prev_env_language_ != 0
+                       && priorpit->layout().isEnvironment()
+                       && (priorpit->getDepth() > pit->getDepth()
+                           || (priorpit->getDepth() == pit->getDepth()
+                               && priorpit->layout() != pit->layout()));
+       Language const * const prev_language =
+               (pit != paragraphs.begin())
+               ? (use_prev_env_language ? prev_env_language_
+                                        : priorpit->getParLanguage(bparams))
+               : outer_language;
+
+       string par_lang = par_language->babel();
+       string prev_lang = prev_language->babel();
+       string doc_lang = doc_language->babel();
+       string outer_lang = outer_language->babel();
+       string lang_begin_command = lyxrc.language_command_begin;
+       string lang_end_command = lyxrc.language_command_end;
+
+       if (runparams.use_polyglossia) {
+               par_lang = getPolyglossiaEnvName(par_language);
+               prev_lang = getPolyglossiaEnvName(prev_language);
+               doc_lang = getPolyglossiaEnvName(doc_language);
+               outer_lang = getPolyglossiaEnvName(outer_language);
+               lang_begin_command = "\\begin{$$lang}";
+               lang_end_command = "\\end{$$lang}";
+       }
+       if (par_lang != prev_lang
            // check if we already put language command in TeXEnvironment()
            && !(style.isEnvironment()
                 && (pit == paragraphs.begin() ||
@@ -359,13 +492,13 @@ TeXOnePar(Buffer const & buf,
                      priorpit->getDepth() <= pit->getDepth())
                     || priorpit->getDepth() < pit->getDepth())))
        {
-               if (!lyxrc.language_command_end.empty() &&
-                   prev_language->babel() != outer_language->babel() &&
-                   !prev_language->babel().empty())
+               if (!lang_end_command.empty() &&
+                   prev_lang != outer_lang &&
+                   !prev_lang.empty())
                {
-                       os << from_ascii(subst(lyxrc.language_command_end,
+                       os << from_ascii(subst(lang_end_command,
                                "$$lang",
-                               prev_language->babel()))
+                               prev_lang))
                           // the '%' is necessary to prevent unwanted whitespace
                           << "%\n";
                        texrow.newline();
@@ -376,29 +509,30 @@ TeXOnePar(Buffer const & buf,
                // the previous one, if the current language is different than the
                // outer_language (which is currently in effect once the previous one
                // is closed).
-               if ((lyxrc.language_command_end.empty() ||
-                    par_language->babel() != outer_language->babel()) &&
-                   !par_language->babel().empty()) {
+               if ((lang_end_command.empty() ||
+                    par_lang != outer_lang) &&
+                   !par_lang.empty()) {
                        // If we're inside an inset, and that inset is within an \L or \R
                        // (or equivalents), then within the inset, too, any opposite
                        // language paragraph should appear within an \L or \R (in addition
                        // to, outside of, the normal language switch commands).
                        // This behavior is not correct for ArabTeX, though.
-                       if (    // not for ArabTeX
-                                       (par_language->lang() != "arabic_arabtex" &&
-                                        outer_language->lang() != "arabic_arabtex") &&
-                                       // are we in an inset?
-                                       runparams.local_font != 0 &&
-                                       // is the inset within an \L or \R?
-                                       //
-                                       // FIXME: currently, we don't check this; this means that
-                                       // we'll have unnnecessary \L and \R commands, but that
-                                       // doesn't seem to hurt (though latex will complain)
-                                       //
-                                       // is this paragraph in the opposite direction?
-                                       runparams.local_font->isRightToLeft() !=
-                                               par_language->rightToLeft()
-                               ) {
+                       if (!runparams.use_polyglossia &&
+                           // not for ArabTeX
+                           (par_language->lang() != "arabic_arabtex" &&
+                            outer_language->lang() != "arabic_arabtex") &&
+                           // are we in an inset?
+                           runparams.local_font != 0 &&
+                           // is the inset within an \L or \R?
+                           //
+                           // FIXME: currently, we don't check this; this means that
+                           // we'll have unnnecessary \L and \R commands, but that
+                           // doesn't seem to hurt (though latex will complain)
+                           //
+                           // is this paragraph in the opposite direction?
+                           runparams.local_font->isRightToLeft() !=
+                                 par_language->rightToLeft()
+                           ) {
                                // FIXME: I don't have a working copy of the Arabi package, so
                                // I'm not sure if the farsi and arabic_arabi stuff is correct
                                // or not...
@@ -419,11 +553,16 @@ TeXOnePar(Buffer const & buf,
                        // With CJK, the CJK tag has to be closed first (see below)
                        if (runparams.encoding->package() != Encoding::CJK) {
                                os << from_ascii(subst(
-                                       lyxrc.language_command_begin,
+                                       lang_begin_command,
                                        "$$lang",
-                                       par_language->babel()))
+                                       par_lang));
+                               if (runparams.use_polyglossia
+                                   && !par_language->polyglossiaOpts().empty())
+                                               os << "["
+                                                 << from_ascii(par_language->polyglossiaOpts())
+                                                 << "]";
                                   // the '%' is necessary to prevent unwanted whitespace
-                                  << "%\n";
+                               os << "%\n";
                                texrow.newline();
                        }
                }
@@ -437,7 +576,9 @@ TeXOnePar(Buffer const & buf,
                // Look ahead for future encoding changes.
                // We try to output them at the beginning of the paragraph,
                // since the \inputencoding command is not allowed e.g. in
-               // sections.
+               // sections. For this reason we only set runparams.moving_arg
+               // after checking for the encoding change, otherwise the
+               // change would be always avoided by switchEncoding().
                for (pos_type i = 0; i < pit->size(); ++i) {
                        char_type const c = pit->getChar(i);
                        Encoding const * const encoding =
@@ -454,11 +595,8 @@ TeXOnePar(Buffer const & buf,
                        // With CJK, only add switch if we have CJK content at the beginning
                        // of the paragraph
                        if (encoding->package() != Encoding::CJK || i == 0) {
-                               OutputParams tmp_rp = runparams;
-                               runparams.moving_arg = false;
                                pair<bool, int> enc_switch = switchEncoding(os, bparams, runparams,
                                        *encoding);
-                               runparams = tmp_rp;
                                // the following is necessary after a CJK environment in a multilingual
                                // context (nesting issue).
                                if (par_language->encoding()->package() == Encoding::CJK &&
@@ -477,9 +615,9 @@ TeXOnePar(Buffer const & buf,
                                        // With CJK, the CJK tag had to be closed first (see above)
                                        if (runparams.encoding->package() == Encoding::CJK) {
                                                os << from_ascii(subst(
-                                                       lyxrc.language_command_begin,
+                                                       lang_begin_command,
                                                        "$$lang",
-                                                       par_language->babel()))
+                                                       par_lang))
                                                // the '%' is necessary to prevent unwanted whitespace
                                                << "%\n";
                                                texrow.newline();
@@ -491,6 +629,9 @@ TeXOnePar(Buffer const & buf,
                }
        }
 
+       runparams.moving_arg |= style.needprotect;
+       Encoding const * const prev_encoding = runparams.encoding;
+
        bool const useSetSpace = bparams.documentClass().provides("SetSpace");
        if (pit->allowParagraphCustomization()) {
                if (pit->params().startOfAppendix()) {
@@ -518,9 +659,8 @@ TeXOnePar(Buffer const & buf,
                os << '\\' << from_ascii(style.latexname());
 
                // Separate handling of optional argument inset.
-               if (style.optionalargs > 0) {
-                       int ret = latexOptArgInsets(*pit, os, runparams,
-                                                   style.optionalargs);
+               if (style.optargs != 0 || style.reqargs != 0) {
+                       int ret = latexArgInsets(*pit, os, runparams, style.reqargs, style.optargs);
                        while (ret > 0) {
                                texrow.newline();
                                --ret;
@@ -540,13 +680,12 @@ TeXOnePar(Buffer const & buf,
                break;
        }
 
-       Font const outerfont = outerFont(distance(paragraphs.begin(), pit),
-                         paragraphs);
+       Font const outerfont = text.outerFont(distance(paragraphs.begin(), pit));
 
        // FIXME UNICODE
        os << from_utf8(everypar);
-       bool need_par = pit->latex(bparams, outerfont,
-                                            os, texrow, runparams);
+       pit->latex(bparams, outerfont, os, texrow,
+                                                runparams, start_pos, end_pos);
 
        // Make sure that \\par is done with the font of the last
        // character if this has another size as the default.
@@ -567,13 +706,16 @@ TeXOnePar(Buffer const & buf,
        if (style.resfont.size() != font.fontInfo().size()
            && nextpit != paragraphs.end()
            && !is_command) {
-               if (!need_par)
-                       os << '{';
+               os << '{';
                os << "\\" << from_ascii(font.latexSize()) << " \\par}";
-       } else if (need_par) {
-               os << "\\par}";
-       } else if (is_command)
+       } else if (is_command) {
                os << '}';
+               if (runparams.encoding != prev_encoding) {
+                       runparams.encoding = prev_encoding;
+                       if (!runparams.isFullUnicode())
+                               os << setEncoding(prev_encoding->iconvName());
+               }
+       }
 
        bool pending_newline = false;
        switch (style.latextype) {
@@ -586,14 +728,13 @@ TeXOnePar(Buffer const & buf,
        case LATEX_ENVIRONMENT: {
                // if its the last paragraph of the current environment
                // skip it otherwise fall through
-               ParagraphList::const_iterator next = nextpit;
-
-               if (next != paragraphs.end() && (next->layout() != pit->layout()
-                       || next->params().depth() != pit->params().depth()))
+               if (nextpit != paragraphs.end() && 
+                   (nextpit->layout() != pit->layout()
+                    || nextpit->params().depth() != pit->params().depth()))
                        break;
        }
 
-               // fall through possible
+       // fall through possible
        default:
                // we don't need it for the last paragraph!!!
                if (nextpit != paragraphs.end())
@@ -617,6 +758,7 @@ TeXOnePar(Buffer const & buf,
        // needed if we're within an \L or \R that we may have opened above (not
        // necessarily in this paragraph) and are about to close.
        bool closing_rtl_ltr_environment =
+               !runparams.use_polyglossia &&
                // not for ArabTeX
                (par_language->lang() != "arabic_arabtex" &&
                 outer_language->lang() != "arabic_arabtex") &&
@@ -626,9 +768,9 @@ TeXOnePar(Buffer const & buf,
                // are we about to close the language?
                ((nextpit != paragraphs.end() &&
                  par_language->babel() !=
-                       (nextpit->getParLanguage(bparams))->babel()) ||
-                (nextpit == paragraphs.end() &&
-                 par_language->babel() != outer_language->babel()));
+                   (nextpit->getParLanguage(bparams))->babel()) ||
+                 (nextpit == paragraphs.end() &&
+                   par_language->babel() != outer_language->babel()));
 
        if (closing_rtl_ltr_environment || (nextpit == paragraphs.end()
            && par_language->babel() != outer_language->babel())) {
@@ -642,19 +784,29 @@ TeXOnePar(Buffer const & buf,
                }
                // when the paragraph uses CJK, the language has to be closed earlier
                if (font.language()->encoding()->package() != Encoding::CJK) {
-                       if (lyxrc.language_command_end.empty()) {
-                               if (!prev_language->babel().empty()) {
+                       if (lang_end_command.empty()) {
+                               // If this is a child, we should restore the
+                               // master language after the last paragraph.
+                               Language const * const current_language =
+                                       (nextpit == paragraphs.end()
+                                       && runparams.master_language)
+                                               ? runparams.master_language
+                                               : outer_language;
+                               string const current_lang = runparams.use_polyglossia ?
+                                       getPolyglossiaEnvName(current_language)
+                                       : current_language->babel();
+                               if (!current_lang.empty()) {
                                        os << from_ascii(subst(
-                                               lyxrc.language_command_begin,
+                                               lang_begin_command,
                                                "$$lang",
-                                               prev_language->babel()));
+                                               current_lang));
                                        pending_newline = true;
                                }
-                       } else if (!par_language->babel().empty()) {
+                       } else if (!par_lang.empty()) {
                                os << from_ascii(subst(
-                                       lyxrc.language_command_end,
+                                       lang_end_command,
                                        "$$lang",
-                                       par_language->babel()));
+                                       par_lang));
                                pending_newline = true;
                        }
                }
@@ -671,9 +823,9 @@ TeXOnePar(Buffer const & buf,
        // also if the next paragraph is a multilingual environment (because of nesting)
        if (nextpit != paragraphs.end() && open_encoding_ == CJK &&
            (nextpit->getParLanguage(bparams)->encoding()->package() != Encoding::CJK ||
-            nextpit->layout().isEnvironment() && nextpit->isMultiLingual(bparams))
-            // in environments, CJK has to be closed later (nesting!)
-            && !style.isEnvironment()) {
+            (nextpit->layout().isEnvironment() && nextpit->isMultiLingual(bparams)))
+            // inbetween environments, CJK has to be closed later (nesting!)
+            && (!style.isEnvironment() || !nextpit->layout().isEnvironment())) {
                os << "\\end{CJK}\n";
                open_encoding_ = none;
        }
@@ -713,9 +865,12 @@ TeXOnePar(Buffer const & buf,
        // If this is the last paragraph, and a local_font was set upon entering
        // the inset, and we're using "auto" or "default" encoding, the encoding
        // should be set back to that local_font's encoding.
+       // However, do not change the encoding when a fully unicode aware backend
+       // such as XeTeX is used.
        if (nextpit == paragraphs.end() && runparams_in.local_font != 0
            && runparams_in.encoding != runparams_in.local_font->language()->encoding()
-           && (bparams.inputenc == "auto" || bparams.inputenc == "default")) {
+           && (bparams.inputenc == "auto" || bparams.inputenc == "default")
+           && (!runparams.isFullUnicode())) {
                runparams_in.encoding = runparams_in.local_font->language()->encoding();
                os << setEncoding(runparams_in.encoding->iconvName());
        }
@@ -724,13 +879,22 @@ TeXOnePar(Buffer const & buf,
                runparams_in.encoding = runparams.encoding;
 
 
-       // we don't need it for the last paragraph!!!
-       // Note from JMarc: we will re-add a \n explicitely in
+       // we don't need a newline for the last paragraph!!!
+       // Note from JMarc: we will re-add a \n explicitly in
        // TeXEnvironment, because it is needed in this case
        if (nextpit != paragraphs.end()) {
                Layout const & next_layout = nextpit->layout();
-               // no blank lines before environments!
-               if (!next_layout.isEnvironment() || style == next_layout) {
+               if (style == next_layout
+                   // no blank lines before environments!
+                   || !next_layout.isEnvironment()
+                   // unless there's a depth change
+                   // FIXME What we really want to do here is put every \begin and \end
+                   // tag on a new line (which was not the case with nested environments).
+                   // But in the present state of play, we don't have access to the
+                   // information whether the current TeX row is empty or not.
+                   // For some ideas about how to fix this, see this thread:
+                   // http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg145787.html
+                   || nextpit->params().depth() != pit->params().depth()) {
                        os << '\n';
                        texrow.newline();
                }
@@ -742,8 +906,6 @@ TeXOnePar(Buffer const & buf,
        return nextpit;
 }
 
-} // anon namespace
-
 
 // LaTeX all paragraphs
 void latexParagraphs(Buffer const & buf,
@@ -772,7 +934,7 @@ void latexParagraphs(Buffer const & buf,
                const_cast<OutputParams&>(runparams).par_end = 0;
        }
 
-       bool const maintext = text.isMainText(buf);
+       bool const maintext = text.isMainText();
        bool const is_child = buf.masterBuffer() != &buf;
 
        // Open a CJK environment at the beginning of the main buffer
@@ -785,16 +947,27 @@ void latexParagraphs(Buffer const & buf,
                texrow.newline();
                open_encoding_ = CJK;
        }
-       // if "auto begin" is switched off, explicitely switch the
+       // if "auto begin" is switched off, explicitly switch the
        // language on at start
+       string const mainlang = runparams.use_polyglossia ?
+               getPolyglossiaEnvName(bparams.language)
+               : bparams.language->babel();
+       string const lang_begin_command = runparams.use_polyglossia ?
+               "\\begin{$$lang}" : lyxrc.language_command_begin;
+
        if (maintext && !lyxrc.language_auto_begin &&
-           !bparams.language->babel().empty()) {
+           !mainlang.empty()) {
                // FIXME UNICODE
-               os << from_utf8(subst(lyxrc.language_command_begin,
+               os << from_utf8(subst(lang_begin_command,
                                        "$$lang",
-                                       bparams.language->babel()))
-                       << '\n';
-       texrow.newline();
+                                       mainlang));
+               if (runparams.use_polyglossia
+                   && !bparams.language->polyglossiaOpts().empty())
+                       os << "["
+                           << from_ascii(bparams.language->polyglossiaOpts())
+                           << "]";
+               os << '\n';
+               texrow.newline();
        }
 
        ParagraphList::const_iterator lastpar;
@@ -803,9 +976,8 @@ void latexParagraphs(Buffer const & buf,
                lastpar = par;
                // FIXME This check should not be needed. We should
                // perhaps issue an error if it is.
-               Layout const & layout = par->forcePlainLayout() ?
-                               tclass.plainLayout() :
-                               par->layout();
+               Layout const & layout = text.inset().forcePlainLayout() ?
+                               tclass.plainLayout() : par->layout();
 
                if (layout.intitle) {
                        if (already_title) {
@@ -860,13 +1032,15 @@ void latexParagraphs(Buffer const & buf,
                texrow.newline();
        }
 
-       // if "auto end" is switched off, explicitely close the language at the end
+       // if "auto end" is switched off, explicitly close the language at the end
        // but only if the last par is in a babel language
-       if (maintext && !lyxrc.language_auto_end && !bparams.language->babel().empty() &&
+       string const lang_end_command = runparams.use_polyglossia ?
+               "\\end{$$lang}" : lyxrc.language_command_end;
+       if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
                lastpar->getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
-               os << from_utf8(subst(lyxrc.language_command_end,
+               os << from_utf8(subst(lang_end_command,
                                        "$$lang",
-                                       bparams.language->babel()))
+                                       mainlang))
                        << '\n';
                texrow.newline();
        }
@@ -938,7 +1112,7 @@ pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
                                count += 7;
                        }
                        if (runparams.local_font != 0
-                           && oldEnc.package() == Encoding::CJK) {
+                           &&  oldEnc.package() == Encoding::CJK) {
                                // within insets, \inputenc switches need
                                // to be embraced within \bgroup...\egroup;
                                // else CJK fails.