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