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 #include <vector>
  19
  20 using std::cerr;
  21 using std::endl;
  22 using std::ostream;
  23 using std::string;
  24 using std::vector;
  25
  26
  27 bool is_math_env(string const & name)
  28 {
  29         static char const * known_math_envs[] = { "equation", "equation*",
  30         "eqnarray", "eqnarray*", "align", "align*", "gather", "gather*",
  31         "multline", "multline*", 0};
  32
  33         for (char const ** what = known_math_envs; *what; ++what)
  34                 if (*what == name)
  35                         return true;
  36         return false;
  37 }
  38
  39
  40 void parse_math(Parser & p, ostream & os, unsigned flags, const mode_type mode)
  41 {
  42         while (p.good()) {
  43                 Token const & t = p.get_token();
  44
  45 #ifdef FILEDEBUG
  46                 cerr << "t: " << t << " flags: " << flags << "\n";
  47 #endif
  48
  49                 if (flags & FLAG_ITEM) {
  50                         if (t.cat() == catSpace)
  51                                 continue;
  52
  53                         flags &= ~FLAG_ITEM;
  54                         if (t.cat() == catBegin) {
  55                                 // skip the brace and collect everything to the next matching
  56                                 // closing brace
  57                                 flags |= FLAG_BRACE_LAST;
  58                                 continue;
  59                         }
  60
  61                         // handle only this single token, leave the loop if done
  62                         flags |= FLAG_LEAVE;
  63                 }
  64
  65
  66                 //
  67                 // cat codes
  68                 //
  69                 if (t.cat() == catMath) {
  70                         if (mode == MATHTEXT_MODE) {
  71                                 // we are inside some text mode thingy, so opening new math is allowed
  72                                 Token const & n = p.get_token();
  73                                 if (n.cat() == catMath) {
  74                                         // TeX's $$...$$ syntax for displayed math
  75                                         os << "\\[";
  76                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  77                                         os << "\\]";
  78                                         p.get_token(); // skip the second '$' token
  79                                 } else {
  80                                         // simple $...$  stuff
  81                                         p.putback();
  82                                         os << '$';
  83                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  84                                         os << '$';
  85                                 }
  86                         }
  87
  88                         else if (flags & FLAG_SIMPLE) {
  89                                 // this is the end of the formula
  90                                 return;
  91                         }
  92
  93                         else {
  94                                 cerr << "\nmode: " << mode << endl;
  95                                 p.error("something strange in the parser\n");
  96                                 break;
  97                         }
  98                 }
  99
 100                 else if (t.cat() == catLetter ||
 101                                t.cat() == catSpace ||
 102                                t.cat() == catSuper ||
 103                                t.cat() == catSub ||
 104                                t.cat() == catOther ||
 105                                t.cat() == catAlign ||
 106                                t.cat() == catActive ||
 107                                t.cat() == catParameter)
 108                         os << t.character();
 109
 110                 else if (t.cat() == catNewline) {
 111                         //if (p.next_token().cat() == catNewline) {
 112                         //      p.get_token();
 113                         //      handle_par(os);
 114                         //} else {
 115                                 os << "\n "; // note the space
 116                         //}
 117                 }
 118
 119                 else if (t.cat() == catBegin) {
 120                         os << '{';
 121                         parse_math(p, os, FLAG_BRACE_LAST, mode);
 122                         os << '}';
 123                 }
 124
 125                 else if (t.cat() == catEnd) {
 126                         if (flags & FLAG_BRACE_LAST)
 127                                 return;
 128                         os << "unexpected '}' in math\n";
 129                 }
 130
 131                 else if (t.cat() == catComment)
 132                         handle_comment(p);
 133
 134                 //
 135                 // control sequences
 136                 //
 137
 138                 else if (t.cs() == "(") {
 139                         os << "\\(";
 140                         parse_math(p, os, FLAG_SIMPLE2, MATH_MODE);
 141                         os << "\\)";
 142                 }
 143
 144                 else if (t.cs() == "[") {
 145                         // special handling of a few common SW user quirks
 146                         p.skip_spaces();
 147                         //if (p.next_token().cs() ==
 148                         os << "\\[";
 149                         parse_math(p, os, FLAG_EQUATION, MATH_MODE);
 150                         os << "\\]";
 151                 }
 152
 153                 else if (t.cs() == "protect")
 154                         // ignore \\protect, will hopefully be re-added during output
 155                         ;
 156
 157                 else if (t.cs() == "begin") {
 158                         string const name = p.getArg('{', '}');
 159                         active_environments.push_back(name);
 160                         os << "\\begin{" << name << "}";
 161                         if (name == "tabular")
 162                                 parse_math(p, os, FLAG_END, MATHTEXT_MODE);
 163                         else
 164                                 parse_math(p, os, FLAG_END, mode);
 165                         os << "\\end{" << name << "}";
 166                 }
 167
 168                 else if (t.cs() == "end") {
 169                         if (flags & FLAG_END) {
 170                                 // eat environment name
 171                                 string const name = p.getArg('{', '}');
 172                                 if (name != active_environment())
 173                                         p.error("\\end{" + name + "} does not match \\begin{"
 174                                                 + active_environment() + "}");
 175                                 active_environments.pop_back();
 176                                 return;
 177                         }
 178                         p.error("found 'end' unexpectedly");
 179                 }
 180
 181                 else if (t.cs() == ")") {
 182                         if (flags & FLAG_SIMPLE2)
 183                                 return;
 184                         p.error("found '\\)' unexpectedly");
 185                 }
 186
 187                 else if (t.cs() == "]") {
 188                         if (flags & FLAG_EQUATION)
 189                                 return;
 190                         p.error("found '\\]' unexpectedly");
 191                 }
 192
 193                 else if (t.cs() == "textrm" || t.cs() == "textsf" || t.cs() == "textbf"
 194                                 || t.cs() == "texttt" || t.cs() == "textsc") {
 195                         os << '\\' << t.cs() << '{';
 196                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 197                         os << '}';
 198                 }
 199
 200                 else if (t.cs() == "mbox") {
 201                         os << "\\mbox{";
 202                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 203                         os << '}';
 204                 }
 205
 206                 else if (t.cs() == "\"") {
 207                         string const name = p.verbatim_item();
 208                              if (name == "a") os << 'ä';
 209                         else if (name == "o") os << 'ö';
 210                         else if (name == "u") os << 'ü';
 211                         else if (name == "A") os << 'Ä';
 212                         else if (name == "O") os << 'Ö';
 213                         else if (name == "U") os << 'Ü';
 214                         else os << "\"{" << name << "}";
 215                 }
 216
 217                 else if (t.cs() == "ss")
 218                         os << "ß";
 219
 220                 else
 221                         os << t.asInput();
 222
 223                 if (flags & FLAG_LEAVE) {
 224                         flags &= ~FLAG_LEAVE;
 225                         break;
 226                 }
 227         }
 228 }
 229
 230
 231
 232
 233 // }])