src/tex2lyx/math.C

   1 /** The .tex to .lyx converter
   2     \author André Pönitz (2003)
   3  */
   4
   5 // {[(
   6
   7 #include <config.h>
   8
   9 #include "Lsstream.h"
  10 #include "tex2lyx.h"
  11
  12 #include <iostream>
  13 #include <vector>
  14
  15 using std::cerr;
  16 using std::endl;
  17 using std::ostream;
  18 using std::vector;
  19
  20
  21 bool is_math_env(string const & name)
  22 {
  23         static char const * known_math_envs[] = { "equation", "equation*",
  24         "eqnarray", "eqnarray*", "align", "align*", 0};
  25
  26         for (char const ** what = known_math_envs; *what; ++what)
  27                 if (*what == name)
  28                         return true;
  29         return false;
  30 }
  31
  32
  33 void parse_math(Parser & p, ostream & os, unsigned flags, const mode_type mode)
  34 {
  35         while (p.good()) {
  36                 Token const & t = p.get_token();
  37
  38 #ifdef FILEDEBUG
  39                 cerr << "t: " << t << " flags: " << flags << "\n";
  40 #endif
  41
  42                 if (flags & FLAG_ITEM) {
  43                         if (t.cat() == catSpace)
  44                                 continue;
  45
  46                         flags &= ~FLAG_ITEM;
  47                         if (t.cat() == catBegin) {
  48                                 // skip the brace and collect everything to the next matching
  49                                 // closing brace
  50                                 flags |= FLAG_BRACE_LAST;
  51                                 continue;
  52                         }
  53
  54                         // handle only this single token, leave the loop if done
  55                         flags |= FLAG_LEAVE;
  56                 }
  57
  58
  59                 //
  60                 // cat codes
  61                 //
  62                 if (t.cat() == catMath) {
  63                         if (mode == MATHTEXT_MODE) {
  64                                 // we are inside some text mode thingy, so opening new math is allowed
  65                                 Token const & n = p.get_token();
  66                                 if (n.cat() == catMath) {
  67                                         // TeX's $$...$$ syntax for displayed math
  68                                         os << "\\[";
  69                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  70                                         os << "\\]";
  71                                         p.get_token(); // skip the second '$' token
  72                                 } else {
  73                                         // simple $...$  stuff
  74                                         p.putback();
  75                                         os << '$';
  76                                         parse_math(p, os, FLAG_SIMPLE, MATH_MODE);
  77                                         os << '$';
  78                                 }
  79                         }
  80
  81                         else if (flags & FLAG_SIMPLE) {
  82                                 // this is the end of the formula
  83                                 return;
  84                         }
  85
  86                         else {
  87                                 cerr << "\nmode: " << mode << endl;
  88                                 p.error("something strange in the parser\n");
  89                                 break;
  90                         }
  91                 }
  92
  93                 else if (t.cat() == catLetter ||
  94                                t.cat() == catSpace ||
  95                                t.cat() == catSuper ||
  96                                t.cat() == catSub ||
  97                                t.cat() == catOther ||
  98                                t.cat() == catAlign ||
  99                                t.cat() == catActive ||
 100                                t.cat() == catParameter)
 101                         os << t.character();
 102
 103                 else if (t.cat() == catNewline) {
 104                         //if (p.next_token().cat() == catNewline) {
 105                         //      p.get_token();
 106                         //      handle_par(os);
 107                         //} else {
 108                                 os << "\n "; // note the space
 109                         //}
 110                 }
 111
 112                 else if (t.cat() == catBegin) {
 113                         os << '{';
 114                         parse_math(p, os, FLAG_BRACE_LAST, mode);
 115                         os << '}';
 116                 }
 117
 118                 else if (t.cat() == catEnd) {
 119                         if (flags & FLAG_BRACE_LAST)
 120                                 return;
 121                         os << "unexpected '}' in math\n";
 122                 }
 123
 124                 else if (t.cat() == catComment)
 125                         handle_comment(p);
 126
 127                 //
 128                 // control sequences
 129                 //
 130
 131                 else if (t.cs() == "(") {
 132                         os << "\\(";
 133                         parse_math(p, os, FLAG_SIMPLE2, MATH_MODE);
 134                         os << "\\)";
 135                 }
 136
 137                 else if (t.cs() == "[") {
 138                         // special handling of a few common SW user quirks
 139                         p.skip_spaces();
 140                         //if (p.next_token().cs() ==
 141                         os << "\\[";
 142                         parse_math(p, os, FLAG_EQUATION, MATH_MODE);
 143                         os << "\\]";
 144                 }
 145
 146                 else if (t.cs() == "protect")
 147                         // ignore \\protect, will hopefully be re-added during output
 148                         ;
 149
 150                 else if (t.cs() == "begin") {
 151                         string const name = p.getArg('{', '}');
 152                         active_environments.push_back(name);
 153                         os << "\\begin{" << name << "}";
 154                         if (name == "tabular")
 155                                 parse_math(p, os, FLAG_END, MATHTEXT_MODE);
 156                         else
 157                                 parse_math(p, os, FLAG_END, mode);
 158                         os << "\\end{" << name << "}";
 159                 }
 160
 161                 else if (t.cs() == "end") {
 162                         if (flags & FLAG_END) {
 163                                 // eat environment name
 164                                 string const name = p.getArg('{', '}');
 165                                 if (name != active_environment())
 166                                         p.error("\\end{" + name + "} does not match \\begin{"
 167                                                 + active_environment() + "}");
 168                                 active_environments.pop_back();
 169                                 return;
 170                         }
 171                         p.error("found 'end' unexpectedly");
 172                 }
 173
 174                 else if (t.cs() == ")") {
 175                         if (flags & FLAG_SIMPLE2)
 176                                 return;
 177                         p.error("found '\\)' unexpectedly");
 178                 }
 179
 180                 else if (t.cs() == "]") {
 181                         if (flags & FLAG_EQUATION)
 182                                 return;
 183                         p.error("found '\\]' unexpectedly");
 184                 }
 185
 186                 else if (t.cs() == "textrm" || t.cs() == "textsf" || t.cs() == "textbf"
 187                                 || t.cs() == "texttt" || t.cs() == "textsc") {
 188                         os << '\\' << t.cs() << '{';
 189                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 190                         os << '}';
 191                 }
 192
 193                 else if (t.cs() == "mbox") {
 194                         os << "\\mbox{";
 195                         parse_math(p, os, FLAG_ITEM, MATHTEXT_MODE);
 196                         os << '}';
 197                 }
 198
 199                 else if (t.cs() == "\"") {
 200                         string const name = p.verbatim_item();
 201                              if (name == "a") os << 'ä';
 202                         else if (name == "o") os << 'ö';
 203                         else if (name == "u") os << 'ü';
 204                         else if (name == "A") os << 'Ä';
 205                         else if (name == "O") os << 'Ö';
 206                         else if (name == "U") os << 'Ü';
 207                         else os << "\"{" << name << "}";
 208                 }
 209
 210                 else if (t.cs() == "ss")
 211                         os << "ß";
 212
 213                 else
 214                         os << t.asInput();
 215
 216                 if (flags & FLAG_LEAVE) {
 217                         flags &= ~FLAG_LEAVE;
 218                         break;
 219                 }
 220         }
 221 }
 222
 223
 224
 225
 226 // }])