src/preproc/eqn/eqn.y

   1 /* Copyright (C) 1989, 1990, 1991, 1992, 2004 Free Software Foundation, Inc.
   2      Written by James Clark (jjc@jclark.com)
   3
   4 This file is part of groff.
   5
   6 groff is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License along
  17 with groff; see the file COPYING.  If not, write to the Free Software
  18 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  19 %{
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 #include "lib.h"
  25 #include "box.h"
  26 extern int non_empty_flag;
  27 int yylex();
  28 void yyerror(const char *);
  29 %}
  30
  31 %union {
  32         char *str;
  33         box *b;
  34         pile_box *pb;
  35         matrix_box *mb;
  36         int n;
  37         column *col;
  38 }
  39
  40 %token OVER
  41 %token SMALLOVER
  42 %token SQRT
  43 %token SUB
  44 %token SUP
  45 %token LPILE
  46 %token RPILE
  47 %token CPILE
  48 %token PILE
  49 %token LEFT
  50 %token RIGHT
  51 %token TO
  52 %token FROM
  53 %token SIZE
  54 %token FONT
  55 %token ROMAN
  56 %token BOLD
  57 %token ITALIC
  58 %token FAT
  59 %token ACCENT
  60 %token BAR
  61 %token UNDER
  62 %token ABOVE
  63 %token <str> TEXT
  64 %token <str> QUOTED_TEXT
  65 %token FWD
  66 %token BACK
  67 %token DOWN
  68 %token UP
  69 %token MATRIX
  70 %token COL
  71 %token LCOL
  72 %token RCOL
  73 %token CCOL
  74 %token MARK
  75 %token LINEUP
  76 %token TYPE
  77 %token VCENTER
  78 %token PRIME
  79 %token SPLIT
  80 %token NOSPLIT
  81 %token UACCENT
  82 %token SPECIAL
  83
  84 /* these are handled in the lexer */
  85 %token SPACE
  86 %token GFONT
  87 %token GSIZE
  88 %token DEFINE
  89 %token NDEFINE
  90 %token TDEFINE
  91 %token SDEFINE
  92 %token UNDEF
  93 %token IFDEF
  94 %token INCLUDE
  95 %token DELIM
  96 %token CHARTYPE
  97 %token SET
  98 %token GRFONT
  99 %token GBFONT
 100
 101 /* The original eqn manual says that `left' is right associative. It's lying.
 102 Consider `left ( ~ left ( ~ right ) right )'. */
 103
 104 %right LEFT
 105 %left RIGHT
 106 %right LPILE RPILE CPILE PILE TEXT QUOTED_TEXT MATRIX MARK LINEUP '^' '~' '\t' '{' SPLIT NOSPLIT
 107 %right FROM TO
 108 %left SQRT OVER SMALLOVER
 109 %right SUB SUP
 110 %right ROMAN BOLD ITALIC FAT FONT SIZE FWD BACK DOWN UP TYPE VCENTER SPECIAL
 111 %right BAR UNDER PRIME
 112 %left ACCENT UACCENT
 113
 114 %type <b> mark from_to sqrt_over script simple equation nonsup
 115 %type <n> number
 116 %type <str> text delim
 117 %type <pb> pile_element_list pile_arg
 118 %type <mb> column_list
 119 %type <col> column column_arg column_element_list
 120
 121 %%
 122 top:
 123         /* empty */
 124         | equation
 125                 { $1->top_level(); non_empty_flag = 1; }
 126         ;
 127
 128 equation:
 129         mark
 130                 { $$ = $1; }
 131         | equation mark
 132                 {
 133                   list_box *lb = $1->to_list_box();
 134                   if (!lb)
 135                     lb = new list_box($1);
 136                   lb->append($2);
 137                   $$ = lb;
 138                 }
 139         ;
 140
 141 mark:
 142         from_to
 143                 { $$ = $1; }
 144         | MARK mark
 145                 { $$ = make_mark_box($2); }
 146         | LINEUP mark
 147                 { $$ = make_lineup_box($2); }
 148         ;
 149
 150 from_to:
 151         sqrt_over  %prec FROM
 152                 { $$ = $1; }
 153         | sqrt_over TO from_to
 154                 { $$ = make_limit_box($1, 0, $3); }
 155         | sqrt_over FROM sqrt_over
 156                 { $$ = make_limit_box($1, $3, 0); }
 157         | sqrt_over FROM sqrt_over TO from_to
 158                 { $$ = make_limit_box($1, $3, $5); }
 159         | sqrt_over FROM sqrt_over FROM from_to
 160                 { $$ = make_limit_box($1, make_limit_box($3, $5, 0), 0); }
 161         ;
 162
 163 sqrt_over:
 164         script
 165                 { $$ = $1; }
 166         | SQRT sqrt_over
 167                 { $$ = make_sqrt_box($2); }
 168         | sqrt_over OVER sqrt_over
 169                 { $$ = make_over_box($1, $3); }
 170         | sqrt_over SMALLOVER sqrt_over
 171                 { $$ = make_small_over_box($1, $3); }
 172         ;
 173
 174 script:
 175         nonsup
 176                 { $$ = $1; }
 177         | simple SUP script
 178                 { $$ = make_script_box($1, 0, $3); }
 179         ;
 180
 181 nonsup:
 182         simple  %prec SUP
 183                 { $$ = $1; }
 184         | simple SUB nonsup
 185                 { $$ = make_script_box($1, $3, 0); }
 186         | simple SUB simple SUP script
 187                 { $$ = make_script_box($1, $3, $5); }
 188         ;
 189
 190 simple:
 191         TEXT
 192                 { $$ = split_text($1); }
 193         | QUOTED_TEXT
 194                 { $$ = new quoted_text_box($1); }
 195         | SPLIT QUOTED_TEXT
 196                 { $$ = split_text($2); }
 197         | NOSPLIT TEXT
 198                 { $$ = new quoted_text_box($2); }
 199         | '^'
 200                 { $$ = new half_space_box; }
 201         | '~'
 202                 { $$ = new space_box; }
 203         | '\t'
 204                 { $$ = new tab_box; }
 205         | '{' equation '}'
 206                 { $$ = $2; }
 207         | PILE pile_arg
 208                 { $2->set_alignment(CENTER_ALIGN); $$ = $2; }
 209         | LPILE pile_arg
 210                 { $2->set_alignment(LEFT_ALIGN); $$ = $2; }
 211         | RPILE pile_arg
 212                 { $2->set_alignment(RIGHT_ALIGN); $$ = $2; }
 213         | CPILE pile_arg
 214                 { $2->set_alignment(CENTER_ALIGN); $$ = $2; }
 215         | MATRIX '{' column_list '}'
 216                 { $$ = $3; }
 217         | LEFT delim equation RIGHT delim
 218                 { $$ = make_delim_box($2, $3, $5); }
 219         | LEFT delim equation
 220                 { $$ = make_delim_box($2, $3, 0); }
 221         | simple BAR
 222                 { $$ = make_overline_box($1); }
 223         | simple UNDER
 224                 { $$ = make_underline_box($1); }
 225         | simple PRIME
 226                 { $$ = make_prime_box($1); }
 227         | simple ACCENT simple
 228                 { $$ = make_accent_box($1, $3); }
 229         | simple UACCENT simple
 230                 { $$ = make_uaccent_box($1, $3); }
 231         | ROMAN simple
 232                 { $$ = new font_box(strsave(get_grfont()), $2); }
 233         | BOLD simple
 234                 { $$ = new font_box(strsave(get_gbfont()), $2); }
 235         | ITALIC simple
 236                 { $$ = new font_box(strsave(get_gfont()), $2); }
 237         | FAT simple
 238                 { $$ = new fat_box($2); }
 239         | FONT text simple
 240                 { $$ = new font_box($2, $3); }
 241         | SIZE text simple
 242                 { $$ = new size_box($2, $3); }
 243         | FWD number simple
 244                 { $$ = new hmotion_box($2, $3); }
 245         | BACK number simple
 246                 { $$ = new hmotion_box(-$2, $3); }
 247         | UP number simple
 248                 { $$ = new vmotion_box($2, $3); }
 249         | DOWN number simple
 250                 { $$ = new vmotion_box(-$2, $3); }
 251         | TYPE text simple
 252                 { $3->set_spacing_type($2); $$ = $3; }
 253         | VCENTER simple
 254                 { $$ = new vcenter_box($2); }
 255         | SPECIAL text simple
 256                 { $$ = make_special_box($2, $3); }
 257         ;
 258
 259 number:
 260         text
 261                 {
 262                   int n;
 263                   if (sscanf($1, "%d", &n) == 1)
 264                     $$ = n;
 265                   a_delete $1;
 266                 }
 267         ;
 268
 269 pile_element_list:
 270         equation
 271                 { $$ = new pile_box($1); }
 272         | pile_element_list ABOVE equation
 273                 { $1->append($3); $$ = $1; }
 274         ;
 275
 276 pile_arg:
 277         '{' pile_element_list '}'
 278                 { $$ = $2; }
 279         | number '{' pile_element_list '}'
 280                 { $3->set_space($1); $$ = $3; }
 281         ;
 282
 283 column_list:
 284         column
 285                 { $$ = new matrix_box($1); }
 286         | column_list column
 287                 { $1->append($2); $$ = $1; }
 288         ;
 289
 290 column_element_list:
 291         equation
 292                 { $$ = new column($1); }
 293         | column_element_list ABOVE equation
 294                 { $1->append($3); $$ = $1; }
 295         ;
 296
 297 column_arg:
 298         '{' column_element_list '}'
 299                 { $$ = $2; }
 300         | number '{' column_element_list '}'
 301                 { $3->set_space($1); $$ = $3; }
 302         ;
 303
 304 column:
 305         COL column_arg
 306                 { $2->set_alignment(CENTER_ALIGN); $$ = $2; }
 307         | LCOL column_arg
 308                 { $2->set_alignment(LEFT_ALIGN); $$ = $2; }
 309         | RCOL column_arg
 310                 { $2->set_alignment(RIGHT_ALIGN); $$ = $2; }
 311         | CCOL column_arg
 312                 { $2->set_alignment(CENTER_ALIGN); $$ = $2; }
 313         ;
 314
 315 text:   TEXT
 316                 { $$ = $1; }
 317         | QUOTED_TEXT
 318                 { $$ = $1; }
 319         ;
 320
 321 delim:
 322         text
 323                 { $$ = $1; }
 324         | '{'
 325                 { $$ = strsave("{"); }
 326         | '}'
 327                 { $$ = strsave("}"); }
 328         ;
 329
 330 %%