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 "Language.h"
  28 #include "LaTeXFeatures.h"
  29 #include "Layout.h"
  30 #include "Font.h"
  31 #include "LyXRC.h"
  32 #include "Row.h"
  33 #include "OutputParams.h"
  34 #include "paragraph_funcs.h"
  35 #include "sgml.h"
  36 #include "TextClass.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/lassert.h"
  46 #include "support/convert.h"
  47 #include "support/debug.h"
  48 #include "support/gettext.h"
  49 #include "support/lstrings.h"
  50 #include "support/textutils.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 using namespace std;
  61 using namespace lyx::support;
  62
  63 namespace lyx {
  64
  65
  66 ParagraphMetrics::ParagraphMetrics(Paragraph const & par) :
  67         position_(-1), par_(&par)
  68 {}
  69
  70
  71 ParagraphMetrics & ParagraphMetrics::operator=(
  72         ParagraphMetrics const & pm)
  73 {
  74         rows_ = pm.rows_;
  75         dim_ = pm.dim_;
  76         par_ = pm.par_;
  77         position_ = pm.position_;
  78         return *this;
  79 }
  80
  81
  82 void ParagraphMetrics::reset(Paragraph const & par)
  83 {
  84         par_ = &par;
  85         dim_ = Dimension();
  86         //position_ = -1;
  87 }
  88
  89
  90 size_t ParagraphMetrics::computeRowSignature(Row const & row,
  91                 BufferParams const & bparams) const
  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, sizeof(char_type));
  97                 if (bparams.trackChanges) {
  98                         Change change = par_->lookupChange(i);
  99                         char_type const b[] = { change.type };
 100                         // 1 byte is enough to encode Change::Type
 101                         crc.process_bytes(b, 1);
 102                 }
 103         }
 104
 105         Dimension const & d = row.dimension();
 106         char_type const b[] = { row.sel_beg, row.sel_end,
 107                 row.begin_margin_sel, row.end_margin_sel, d.wid, d.asc, d.des};
 108         // Each of the variable to process is 4 bytes: 4x7 = 28
 109         crc.process_bytes(b, 28);
 110
 111         return crc.checksum();
 112 }
 113
 114
 115 void ParagraphMetrics::setPosition(int position)
 116 {
 117         position_ = position;
 118 }
 119
 120
 121 Dimension const & ParagraphMetrics::insetDimension(Inset const * inset) const
 122 {
 123         InsetDims::const_iterator it = inset_dims_.find(inset);
 124         if (it != inset_dims_.end())
 125                 return it->second;
 126
 127         static Dimension dummy;
 128         return dummy;
 129 }
 130
 131
 132 void ParagraphMetrics::setInsetDimension(Inset const * inset,
 133                 Dimension const & dim)
 134 {
 135         inset_dims_[inset] = dim;
 136 }
 137
 138
 139 Row & ParagraphMetrics::getRow(pos_type pos, bool boundary)
 140 {
 141         LASSERT(!rows().empty(), /**/);
 142
 143         // If boundary is set we should return the row on which
 144         // the character before is inside.
 145         if (pos > 0 && boundary)
 146                 --pos;
 147
 148         RowList::iterator rit = rows_.end();
 149         RowList::iterator const begin = rows_.begin();
 150
 151         for (--rit; rit != begin && rit->pos() > pos; --rit)
 152                 ;
 153
 154         return *rit;
 155 }
 156
 157
 158 Row const & ParagraphMetrics::getRow(pos_type pos, bool boundary) const
 159 {
 160         LASSERT(!rows().empty(), /**/);
 161
 162         // If boundary is set we should return the row on which
 163         // the character before is inside.
 164         if (pos > 0 && boundary)
 165                 --pos;
 166
 167         RowList::const_iterator rit = rows_.end();
 168         RowList::const_iterator const begin = rows_.begin();
 169
 170         for (--rit; rit != begin && rit->pos() > pos; --rit)
 171                 ;
 172
 173         return *rit;
 174 }
 175
 176
 177 size_t ParagraphMetrics::pos2row(pos_type pos) const
 178 {
 179         LASSERT(!rows().empty(), /**/);
 180
 181         RowList::const_iterator rit = rows_.end();
 182         RowList::const_iterator const begin = rows_.begin();
 183
 184         for (--rit; rit != begin && rit->pos() > pos; --rit)
 185                 ;
 186
 187         return rit - begin;
 188 }
 189
 190
 191 void ParagraphMetrics::dump() const
 192 {
 193         lyxerr << "Paragraph::dump: rows.size(): " << rows_.size() << endl;
 194         for (size_t i = 0; i != rows_.size(); ++i) {
 195                 lyxerr << "  row " << i << ":   ";
 196                 rows_[i].dump();
 197         }
 198 }
 199
 200 int ParagraphMetrics::rightMargin(BufferView const & bv) const
 201 {
 202         BufferParams const & params = bv.buffer().params();
 203         DocumentClass const & tclass = params.documentClass();
 204         frontend::FontMetrics const & fm = theFontMetrics(params.getFont());
 205         int const r_margin =
 206                 bv.rightMargin()
 207                 + fm.signedWidth(tclass.rightmargin())
 208                 + fm.signedWidth(par_->layout().rightmargin)
 209                 * 4 / (par_->getDepth() + 4);
 210
 211         return r_margin;
 212 }
 213
 214
 215 int ParagraphMetrics::singleWidth(pos_type pos, Font const & font) const
 216 {
 217         // The most special cases are handled first.
 218         if (Inset const * inset = par_->getInset(pos))
 219                 return insetDimension(inset).wid;
 220
 221         char_type c = par_->getChar(pos);
 222
 223         if (c == '\t')
 224                 return 4 * theFontMetrics(font).width(' ');
 225
 226         if (!isPrintable(c))
 227                 return theFontMetrics(font).width(c);
 228
 229         Language const * language = font.language();
 230         if (language->rightToLeft()) {
 231                 if (language->lang() == "arabic_arabtex" ||
 232                         language->lang() == "arabic_arabi" ||
 233                         language->lang() == "farsi") {
 234                                 if (Encodings::isArabicComposeChar(c))
 235                                         return 0;
 236                                 c = par_->transformChar(c, pos);
 237                 } else if (language->lang() == "hebrew" &&
 238                                 Encodings::isHebrewComposeChar(c)) {
 239                         return 0;
 240                 }
 241         }
 242         return theFontMetrics(font).width(c);
 243 }
 244
 245
 246 bool ParagraphMetrics::hfillExpansion(Row const & row, pos_type pos) const
 247 {
 248         if (!par_->isHfill(pos))
 249                 return false;
 250
 251         LASSERT(pos >= row.pos() && pos < row.endpos(), /**/);
 252
 253         // expand at the end of a row only if there is another hfill on the same row
 254         if (pos == row.endpos() - 1) {
 255                 for (pos_type i = row.pos(); i < pos; i++) {
 256                         if (par_->isHfill(i))
 257                                 return true;
 258                 }
 259                 return false;
 260         }
 261
 262         // expand at the beginning of a row only if it is the first row of a paragraph
 263         if (pos == row.pos()) {
 264                 return pos == 0;
 265         }
 266
 267         // do not expand in some labels
 268         if (par_->layout().margintype != MARGIN_MANUAL && pos < par_->beginOfBody())
 269                 return false;
 270
 271         // if there is anything between the first char of the row and
 272         // the specified position that is neither a newline nor an hfill,
 273         // the hfill will be expanded, otherwise it won't
 274         for (pos_type i = row.pos(); i < pos; i++) {
 275                 if (!par_->isNewline(i) && !par_->isHfill(i))
 276                         return true;
 277         }
 278         return false;
 279 }
 280
 281 } // namespace lyx