src/tex2lyx/math.C

   1 /**
   2  * \file math.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author André Pönitz
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 // {[(
  12
  13 #include <config.h>
  14
  15 #include "tex2lyx.h"
  16
  17 #include <iostream>
  18
  19 using std::cerr;
  20 using std::endl;
  21
  22 using std::ostream;
  23 using std::string;
  24
  25
  26 bool is_math_env(string const & name)
  27 {
  28         static char const * known_math_envs[] = { "equation", "equation*",
  29         "eqnarray", "eqnarray*", "align", "align*", "gather", "gather*",
  30         "multline", "multline*", "math", "displaymath", "flalign", "flalign*",
  31         // These require extra args
  32         "alignat", "alignat*", "xalignat", "xalignat*", "xxalignat",
  33         0};
  34
  35         for (char const ** what = known_math_envs; *what; ++what)
  36                 if (*what == name)
  37                         return true;
  38         return false;
  39 }
  40
  41
  42 void parse_math(Parser & p, ostream & os, unsigned flags, const mode_type mode)
  43 {
  44         while (p.good()) {
  45                 Token const & t = p.get_token();
  46
  47 #ifdef FILEDEBUG
  48                 cerr << "t: " << t << " flags: " << flags << "\n";
  49 #endif
  50
  51                 if (flags & FLAG_ITEM) {
  52                         if (t.cat() == catSpace)
  53                                 continue;
  54
  55                         flags &= ~FLAG_ITEM;
  56                         if (t.cat() == catBegin) {
  57                                 // skip the brace and collect everything to the next matching
  58                                 // closing brace
  59                                 flags |= FLAG_BRACE_LAST;
  60                                 continue;
  61                         }
  62
  63                         // handle only this single token, leave the loop if done
  64                         flags |= FLAG_LEAVE;
  65                 }
  66
  67
  68                 //
  69                 // cat codes
  70                 //
  71                 if (t.cat() == catMath) {
  72                         if (mode == MATHTEXT_MODE) {
  73                                 // we are inside some text mode thingy, so opening new math is allowed
  74                                 Token const & n = p.get_token();
  75                                 if (n.cat() == catMath) {
  76                                         // TeX's $$...$$ syntax for displayed math
  77                                         os << "\\[";
  78                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  79                                         os << "\\]";
  80                                         p.get_token(); // skip the second '$' token
  81                                 } else {
  82                                         // simple $...$  stuff
  83                                         p.putback();
  84                                         os << '$';
  85                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  86                                         os << '$';
  87                                 }
  88                         }
  89
  90                         else if (flags & FLAG_SIMPLE) {
  91                                 // this is the end of the formula
  92                                 return;
  93                         }
  94
  95                         else {
  96                                 cerr << "\nmode: " << mode << endl;
  97                                 p.error("something strange in the parser\n");
  98                                 break;
  99                         }
 100                 }
 101
 102                 else if (t.cat() == catLetter ||
 103                                t.cat() == catSuper ||
 104                                t.cat() == catSub ||
 105                                t.cat() == catOther ||
 106                                t.cat() == catAlign ||
 107                                t.cat() == catActive ||
 108                                t.cat() == catParameter)
 109                         os << t.character();
 110
 111                 else if (t.cat() == catBegin) {
 112                         os << '{';
 113                         parse_math(p, os, FLAG_BRACE_LAST, mode);
 114                         os << '}';
 115                 }
 116
 117                 else if (t.cat() == catEnd) {
 118                         if (flags & FLAG_BRACE_LAST)
 119                                 return;
 120                         os << "unexpected '}' in math\n";
 121                 }
 122
 123                 else if (t.cat() == catComment) {
 124                         if (t.cs().size())
 125                                 cerr << "Ignoring comment: " << t.asInput();
 126                         else
 127                                 // "%\n" combination
 128                                 p.skip_spaces();
 129                 }
 130
 131                 //
 132                 // control sequences
 133                 //
 134
 135                 else if (t.cs() == "(") {
 136                         os << "\\(";
 137                         parse_math(p, os, FLAG_SIMPLE2, MATH_MODE);
 138                         os << "\\)";
 139                 }
 140
 141                 else if (t.cs() == "[") {
 142                         // special handling of a few common SW user quirks
 143                         p.skip_spaces();
 144                         //if (p.next_token().cs() ==
 145                         os << "\\[";
 146                         parse_math(p, os, FLAG_EQUATION, MATH_MODE);
 147                         os << "\\]";
 148                 }
 149
 150                 else if (t.cs() == "protect")
 151                         // ignore \\protect, will hopefully be re-added during output
 152                         ;
 153
 154                 else if (t.cs() == "begin") {
 155                         string const name = p.getArg('{', '}');
 156                         active_environments.push_back(name);
 157                         os << "\\begin{" << name << "}";
 158                         if (name == "tabular")
 159                                 parse_math(p, os, FLAG_END, MATHTEXT_MODE);
 160                         else
 161                                 parse_math(p, os, FLAG_END, mode);
 162                         os << "\\end{" << name << "}";
 163                         active_environments.pop_back();
 164                 }
 165
 166                 else if (t.cs() == "end") {
 167                         if (flags & FLAG_END) {
 168                                 // eat environment name
 169                                 string const name = p.getArg('{', '}');
 170                                 if (name != active_environment())
 171                                         p.error("\\end{" + name + "} does not match \\begin{"
 172                                                 + active_environment() + "}");
 173                                 return;
 174                         }
 175                         p.error("found 'end' unexpectedly");
 176                 }
 177
 178                 else if (t.cs() == ")") {
 179                         if (flags & FLAG_SIMPLE2)
 180                                 return;
 181                         p.error("found '\\)' unexpectedly");
 182                 }
 183
 184                 else if (t.cs() == "]") {
 185                         if (flags & FLAG_EQUATION)
 186                                 return;
 187                         p.error("found '\\]' unexpectedly");
 188                 }
 189
 190                 else if (t.cs() == "textrm" || t.cs() == "textsf" || t.cs() == "textbf"
 191                                 || t.cs() == "texttt" || t.cs() == "textsc"
 192                                 || t.cs() == "text" || t.cs() == "intertext") {
 193                         os << '\\' << t.cs() << '{';
 194                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 195                         os << '}';
 196                 }
 197
 198                 else if (t.cs() == "mbox" || t.cs() == "fbox") {
 199                         os << "\\" << t.cs() << '{';
 200                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 201                         os << '}';
 202                 }
 203
 204                 else if (t.cs() == "\"") {
 205                         string const name = p.verbatim_item();
 206                              if (name == "a") os << 'ä';
 207                         else if (name == "o") os << 'ö';
 208                         else if (name == "u") os << 'ü';
 209                         else if (name == "A") os << 'Ä';
 210                         else if (name == "O") os << 'Ö';
 211                         else if (name == "U") os << 'Ü';
 212                         else os << "\"{" << name << "}";
 213                 }
 214
 215                 else if (t.cs() == "ss")
 216                         os << "ß";
 217
 218                 else
 219                         os << t.asInput();
 220
 221                 if (flags & FLAG_LEAVE) {
 222                         flags &= ~FLAG_LEAVE;
 223                         break;
 224                 }
 225         }
 226 }
 227
 228
 229
 230
 231 // }])