src/ParagraphMetrics.cpp

   1 /**
   2  * \file Paragraph.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup
   7  * \author Lars Gullik Bjønnes
   8  * \author Jean-Marc Lasgouttes
   9  * \author Angus Leeming
  10  * \author John Levon
  11  * \author André Pönitz
  12  * \author Dekel Tsur
  13  * \author Jürgen Vigna
  14  *
  15  * Full author contact details are available in file CREDITS.
  16  */
  17
  18 #include <config.h>
  19
  20 #include "ParagraphMetrics.h"
  21
  22 #include "Buffer.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "Counters.h"
  26 #include "Encoding.h"
  27 #include "debug.h"
  28 #include "gettext.h"
  29 #include "Language.h"
  30 #include "LaTeXFeatures.h"
  31 #include "Font.h"
  32 #include "LyXRC.h"
  33 #include "Row.h"
  34 #include "OutputParams.h"
  35 #include "paragraph_funcs.h"
  36 #include "sgml.h"
  37 #include "TexRow.h"
  38 #include "VSpace.h"
  39
  40 #include "frontends/FontMetrics.h"
  41
  42 #include "insets/InsetBibitem.h"
  43 #include "insets/InsetOptArg.h"
  44
  45 #include "support/lstrings.h"
  46 #include "support/textutils.h"
  47 #include "support/convert.h"
  48 #include "support/unicode.h"
  49
  50 #include <boost/bind.hpp>
  51 #include <boost/crc.hpp>
  52
  53 #include <algorithm>
  54 #include <list>
  55 #include <stack>
  56 #include <sstream>
  57
  58
  59 namespace lyx {
  60
  61 using lyx::support::contains;
  62 using lyx::support::rsplit;
  63 using support::subst;
  64
  65 using std::distance;
  66 using std::endl;
  67 using std::list;
  68 using std::stack;
  69 using std::string;
  70 using std::ostream;
  71 using std::ostringstream;
  72
  73
  74 ParagraphMetrics::ParagraphMetrics(Paragraph const & par): par_(&par)
  75 {
  76 }
  77
  78
  79 ParagraphMetrics & ParagraphMetrics::operator=(
  80         ParagraphMetrics const & pm)
  81 {
  82         rows_ = pm.rows_;
  83         dim_ = pm.dim_;
  84         par_ = pm.par_;
  85         return *this;
  86 }
  87
  88
  89 void ParagraphMetrics::reset(Paragraph const & par)
  90 {
  91         par_ = &par;
  92         dim_ = Dimension();
  93         rows_.clear();
  94 }
  95
  96
  97 size_type ParagraphMetrics::calculateRowSignature(Row const & row)
  98 {
  99         boost::crc_32_type crc;
 100         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 101                 char_type const b[] = { par_->getChar(i) };
 102                 crc.process_bytes(b, 1);
 103         }
 104         return crc.checksum();
 105 }
 106
 107
 108 void ParagraphMetrics::updateRowChangeStatus()
 109 {
 110         size_t const size = rows_.size();
 111         row_change_status_.resize(size);
 112         row_signature_.resize(size);
 113
 114         for (size_t i = 0; i != size; ++i) {
 115                 // Row signature; has row changed since last update?
 116                 size_type const row_sig = calculateRowSignature(rows_[i]);
 117                 row_change_status_[i] = row_signature_[i] != row_sig;
 118                 row_signature_[i] = row_sig;
 119         }
 120 }
 121
 122
 123 Row & ParagraphMetrics::getRow(pos_type pos, bool boundary)
 124 {
 125         BOOST_ASSERT(!rows().empty());
 126
 127         // If boundary is set we should return the row on which
 128         // the character before is inside.
 129         if (pos > 0 && boundary)
 130                 --pos;
 131
 132         RowList::iterator rit = rows_.end();
 133         RowList::iterator const begin = rows_.begin();
 134
 135         for (--rit; rit != begin && rit->pos() > pos; --rit)
 136                 ;
 137
 138         return *rit;
 139 }
 140
 141
 142 Row const & ParagraphMetrics::getRow(pos_type pos, bool boundary) const
 143 {
 144         BOOST_ASSERT(!rows().empty());
 145
 146         // If boundary is set we should return the row on which
 147         // the character before is inside.
 148         if (pos > 0 && boundary)
 149                 --pos;
 150
 151         RowList::const_iterator rit = rows_.end();
 152         RowList::const_iterator const begin = rows_.begin();
 153
 154         for (--rit; rit != begin && rit->pos() > pos; --rit)
 155                 ;
 156
 157         return *rit;
 158 }
 159
 160
 161 size_t ParagraphMetrics::pos2row(pos_type pos) const
 162 {
 163         BOOST_ASSERT(!rows().empty());
 164
 165         RowList::const_iterator rit = rows_.end();
 166         RowList::const_iterator const begin = rows_.begin();
 167
 168         for (--rit; rit != begin && rit->pos() > pos; --rit)
 169                 ;
 170
 171         return rit - begin;
 172 }
 173
 174
 175 void ParagraphMetrics::dump() const
 176 {
 177         lyxerr << "Paragraph::dump: rows.size(): " << rows_.size() << endl;
 178         for (size_t i = 0; i != rows_.size(); ++i) {
 179                 lyxerr << "  row " << i << ":   ";
 180                 rows_[i].dump();
 181         }
 182 }
 183
 184 int ParagraphMetrics::rightMargin(Buffer const & buffer) const
 185 {
 186         BufferParams const & params = buffer.params();
 187         TextClass const & tclass = params.getTextClass();
 188         frontend::FontMetrics const & fm = theFontMetrics(params.getFont());
 189         int const r_margin =
 190                 lyx::rightMargin()
 191                 + fm.signedWidth(tclass.rightmargin())
 192                 + fm.signedWidth(par_->layout()->rightmargin)
 193                 * 4 / (par_->getDepth() + 4);
 194
 195         return r_margin;
 196 }
 197
 198
 199 int ParagraphMetrics::singleWidth(pos_type pos, Font const & font) const
 200 {
 201         char_type c = par_->getChar(pos);
 202
 203         // The most special cases are handled first.
 204         if (c == Paragraph::META_INSET)
 205                 return par_->getInset(pos)->width();
 206
 207         if (!isPrintable(c))
 208                 return theFontMetrics(font).width(c);
 209
 210         Language const * language = font.language();
 211         if (language->rightToLeft()) {
 212                 if (language->lang() == "arabic_arabtex" ||
 213                         language->lang() == "arabic_arabi" ||
 214                         language->lang() == "farsi") {
 215                                 if (Encodings::isComposeChar_arabic(c))
 216                                         return 0;
 217                                 c = par_->transformChar(c, pos);
 218                 } else if (language->lang() == "hebrew" &&
 219                         Encodings::isComposeChar_hebrew(c))
 220                         return 0;
 221         }
 222         return theFontMetrics(font).width(c);
 223 }
 224
 225
 226 } // namespace lyx