edit/syntax.c

   1 /* editor syntax highlighting.
   2
   3    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   4    2007 Free Software Foundation, Inc.
   5
   6    Authors: 1998 Paul Sheer
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22 */
  23
  24 /** \file
  25  *  \brief Source: editor syntax highlighting
  26  *  \author Paul Sheer
  27  *  \date 1996, 1997
  28  *
  29  *  Mispelled words are flushed from the syntax highlighting rules
  30  *  when they have been around longer than
  31  *  TRANSIENT_WORD_TIME_OUT seconds. At a cursor rate of 30
  32  *  chars per second and say 3 chars + a space per word, we can
  33  *  accumulate 450 words absolute max with a value of 60. This is
  34  *  below this limit of 1024 words in a context.
  35  */
  36
  37 #include <config.h>
  38
  39 #include <stdio.h>
  40 #include <stdarg.h>
  41 #include <sys/types.h>
  42 #include <unistd.h>
  43 #include <string.h>
  44 #include <ctype.h>
  45 #include <errno.h>
  46 #include <sys/stat.h>
  47 #include <stdlib.h>
  48
  49 #include "../src/global.h"
  50
  51 #include "edit-impl.h"
  52 #include "edit-widget.h"
  53
  54 #include "../src/search/search.h"       /* search engine */
  55
  56 #include "../src/tty/color.h"
  57
  58 #include "edit-impl.h"
  59 #include "edit-widget.h"
  60
  61 #include "../src/main.h"                /* mc_home */
  62 #include "../src/wtools.h"              /* message() */
  63 #include "../src/strutil.h"             /* utf string functions */
  64
  65 /* bytes */
  66 #define SYNTAX_MARKER_DENSITY 512
  67
  68 #define TRANSIENT_WORD_TIME_OUT 60
  69
  70 #define UNKNOWN_FORMAT "unknown"
  71
  72 #define MAX_WORDS_PER_CONTEXT   1024
  73 #define MAX_CONTEXTS            128
  74
  75 #define RULE_ON_LEFT_BORDER 1
  76 #define RULE_ON_RIGHT_BORDER 2
  77
  78 #define SYNTAX_TOKEN_STAR       '\001'
  79 #define SYNTAX_TOKEN_PLUS       '\002'
  80 #define SYNTAX_TOKEN_BRACKET    '\003'
  81 #define SYNTAX_TOKEN_BRACE      '\004'
  82
  83 struct key_word {
  84     char *keyword;
  85     unsigned char first;
  86     char *whole_word_chars_left;
  87     char *whole_word_chars_right;
  88     int line_start;
  89     int color;
  90 };
  91
  92 struct context_rule {
  93     char *left;
  94     unsigned char first_left;
  95     char *right;
  96     unsigned char first_right;
  97     char line_start_left;
  98     char line_start_right;
  99     int between_delimiters;
 100     char *whole_word_chars_left;
 101     char *whole_word_chars_right;
 102     char *keyword_first_chars;
 103     int spelling;
 104     /* first word is word[1] */
 105     struct key_word **keyword;
 106 };
 107
 108 struct _syntax_marker {
 109     long offset;
 110     struct syntax_rule rule;
 111     struct _syntax_marker *next;
 112 };
 113
 114 int option_syntax_highlighting = 1;
 115 int option_auto_syntax = 1;
 116 char *option_syntax_type = NULL;
 117
 118 static gint
 119 mc_defines_destroy (gpointer key, gpointer value, gpointer data)
 120 {
 121     char **values = value;
 122
 123     (void) data;
 124
 125     g_free (key);
 126     while (*values)
 127         g_free (*values++);
 128     g_free (value);
 129
 130     return FALSE;
 131 }
 132
 133 /* Completely destroys the defines tree */
 134 static inline void
 135 destroy_defines (GTree **defines)
 136 {
 137     g_tree_traverse (*defines, mc_defines_destroy, G_POST_ORDER, NULL);
 138     g_tree_destroy (*defines);
 139     *defines = 0;
 140 }
 141
 142 static void
 143 subst_defines (GTree *defines, char **argv, char **argv_end)
 144 {
 145     char **t, **p;
 146     int argc;
 147
 148     while (*argv && argv < argv_end) {
 149         if ((t = g_tree_lookup (defines, *argv))) {
 150             int count = 0;
 151
 152             /* Count argv array members */
 153             argc = 0;
 154             for (p = &argv[1]; *p; p++)
 155                 argc++;
 156
 157             /* Count members of definition array */
 158             for (p = t; *p; p++)
 159                 count++;
 160             p = &argv[count + argc];
 161
 162             /* Buffer overflow or infinitive loop in define */
 163             if (p >= argv_end)
 164                 break;
 165
 166             /* Move rest of argv after definition members */
 167             while (argc >= 0)
 168                 *p-- = argv[argc-- + 1];
 169
 170             /* Copy definition members to argv */
 171             for (p = argv; *t; *p++ = *t++);
 172         }
 173         argv++;
 174     }
 175 }
 176
 177 static long
 178 compare_word_to_right (WEdit *edit, long i, const char *text,
 179                        const char *whole_left, const char *whole_right,
 180                        int line_start)
 181 {
 182     const unsigned char *p, *q;
 183     int c, d, j;
 184
 185     if (!*text)
 186         return -1;
 187     c = edit_get_byte (edit, i - 1);
 188     if (line_start)
 189         if (c != '\n')
 190             return -1;
 191     if (whole_left)
 192         if (strchr (whole_left, c))
 193             return -1;
 194
 195     for (p = (unsigned char *) text, q = p + str_term_width1 ((char *) p); p < q; p++, i++) {
 196         switch (*p) {
 197         case SYNTAX_TOKEN_STAR:
 198             if (++p > q)
 199                 return -1;
 200             for (;;) {
 201                 c = edit_get_byte (edit, i);
 202                 if (!*p)
 203                     if (whole_right)
 204                         if (!strchr (whole_right, c))
 205                             break;
 206                 if (c == *p)
 207                     break;
 208                 if (c == '\n')
 209                     return -1;
 210                 i++;
 211             }
 212             break;
 213         case SYNTAX_TOKEN_PLUS:
 214             if (++p > q)
 215                 return -1;
 216             j = 0;
 217             for (;;) {
 218                 c = edit_get_byte (edit, i);
 219                 if (c == *p) {
 220                     j = i;
 221                     if (*p == *text && !p[1])   /* handle eg '+' and @+@ keywords properly */
 222                         break;
 223                 }
 224                 if (j && strchr ((char *) p + 1, c))    /* c exists further down, so it will get matched later */
 225                     break;
 226                 if (c == '\n' || c == '\t' || c == ' ') {
 227                     if (!*p) {
 228                         i--;
 229                         break;
 230                     }
 231                     if (!j)
 232                         return -1;
 233                     i = j;
 234                     break;
 235                 }
 236                 if (whole_right)
 237                     if (!strchr (whole_right, c)) {
 238                         if (!*p) {
 239                             i--;
 240                             break;
 241                         }
 242                         if (!j)
 243                             return -1;
 244                         i = j;
 245                         break;
 246                     }
 247                 i++;
 248             }
 249             break;
 250         case SYNTAX_TOKEN_BRACKET:
 251             if (++p > q)
 252                 return -1;
 253             c = -1;
 254             for (;; i++) {
 255                 d = c;
 256                 c = edit_get_byte (edit, i);
 257                 for (j = 0; p[j] != SYNTAX_TOKEN_BRACKET && p[j]; j++)
 258                     if (c == p[j])
 259                         goto found_char2;
 260                 break;
 261               found_char2:
 262                 ; /* dummy command */
 263             }
 264             i--;
 265             while (*p != SYNTAX_TOKEN_BRACKET && p <= q)
 266                 p++;
 267             if (p > q)
 268                 return -1;
 269             if (p[1] == d)
 270                 i--;
 271             break;
 272         case SYNTAX_TOKEN_BRACE:
 273             if (++p > q)
 274                 return -1;
 275             c = edit_get_byte (edit, i);
 276             for (; *p != SYNTAX_TOKEN_BRACE && *p; p++)
 277                 if (c == *p)
 278                     goto found_char3;
 279             return -1;
 280           found_char3:
 281             while (*p != SYNTAX_TOKEN_BRACE && p < q)
 282                  p++;
 283             break;
 284         default:
 285             if (*p != edit_get_byte (edit, i))
 286                 return -1;
 287         }
 288     }
 289     if (whole_right)
 290         if (strchr (whole_right, edit_get_byte (edit, i)))
 291             return -1;
 292     return i;
 293 }
 294
 295 static inline const char *xx_strchr (const unsigned char *s, int c)
 296 {
 297     while (*s >= '\005' && *s != (unsigned char) c) {
 298         s++;
 299     }
 300     return (const char *) s;
 301 }
 302
 303 static inline struct syntax_rule apply_rules_going_right (WEdit * edit, long i, struct syntax_rule rule)
 304 {
 305     struct context_rule *r;
 306     int contextchanged = 0, c;
 307     int found_right = 0, found_left = 0, keyword_foundleft = 0, keyword_foundright = 0;
 308     int is_end;
 309     long end = 0;
 310     struct syntax_rule _rule = rule;
 311
 312     if (!(c = edit_get_byte (edit, i)))
 313         return rule;
 314     is_end = (rule.end == (unsigned char) i);
 315
 316 /* check to turn off a keyword */
 317     if (_rule.keyword) {
 318         if (edit_get_byte (edit, i - 1) == '\n')
 319             _rule.keyword = 0;
 320         if (is_end) {
 321             _rule.keyword = 0;
 322             keyword_foundleft = 1;
 323         }
 324     }
 325
 326 /* check to turn off a context */
 327     if (_rule.context && !_rule.keyword) {
 328         long e;
 329         r = edit->rules[_rule.context];
 330         if (r->first_right == c && !(rule.border & RULE_ON_RIGHT_BORDER) && (e = compare_word_to_right (edit, i, r->right, r->whole_word_chars_left, r->whole_word_chars_right, r->line_start_right)) > 0) {
 331             _rule.end = e;
 332             found_right = 1;
 333             _rule.border = RULE_ON_RIGHT_BORDER;
 334             if (r->between_delimiters)
 335                 _rule.context = 0;
 336         } else if (is_end && rule.border & RULE_ON_RIGHT_BORDER) {
 337
 338 /* always turn off a context at 4 */
 339             found_left = 1;
 340             _rule.border = 0;
 341             if (!keyword_foundleft)
 342                 _rule.context = 0;
 343         } else if (is_end && rule.border & RULE_ON_LEFT_BORDER) {
 344
 345 /* never turn off a context at 2 */
 346             found_left = 1;
 347             _rule.border = 0;
 348         }
 349     }
 350
 351 /* check to turn on a keyword */
 352     if (!_rule.keyword) {
 353         const char *p;
 354
 355         p = (r = edit->rules[_rule.context])->keyword_first_chars;
 356         if (p)
 357         while (*(p = xx_strchr ((unsigned char *) p + 1, c))) {
 358             struct key_word *k;
 359             int count;
 360             long e;
 361
 362             count = p - r->keyword_first_chars;
 363             k = r->keyword[count];
 364             e = compare_word_to_right (edit, i, k->keyword, k->whole_word_chars_left, k->whole_word_chars_right, k->line_start);
 365             if (e > 0) {
 366                 end = e;
 367                 _rule.end = e;
 368                 _rule.keyword = count;
 369                 keyword_foundright = 1;
 370                 break;
 371             }
 372         }
 373     }
 374 /* check to turn on a context */
 375     if (!_rule.context) {
 376         if (!found_left && is_end) {
 377             if (rule.border & RULE_ON_RIGHT_BORDER) {
 378                 _rule.border = 0;
 379                 _rule.context = 0;
 380                 contextchanged = 1;
 381                 _rule.keyword = 0;
 382
 383             } else if (rule.border & RULE_ON_LEFT_BORDER) {
 384                 r = edit->rules[_rule._context];
 385                 _rule.border = 0;
 386                 if (r->between_delimiters) {
 387                     long e;
 388                     _rule.context = _rule._context;
 389                     contextchanged = 1;
 390                     _rule.keyword = 0;
 391                     if (r->first_right == c && (e = compare_word_to_right (edit, i, r->right, r->whole_word_chars_left, r->whole_word_chars_right, r->line_start_right)) >= end) {
 392                         _rule.end = e;
 393                         found_right = 1;
 394                         _rule.border = RULE_ON_RIGHT_BORDER;
 395                         _rule.context = 0;
 396                     }
 397                 }
 398             }
 399         }
 400
 401         if (!found_right) {
 402             int count;
 403             struct context_rule **rules = edit->rules;
 404
 405             for (count = 1; rules[count]; count++) {
 406                 r = rules[count];
 407                 if (r->first_left == c) {
 408                     long e;
 409
 410                     e = compare_word_to_right (edit, i, r->left, r->whole_word_chars_left, r->whole_word_chars_right, r->line_start_left);
 411                     if (e >= end && (!_rule.keyword || keyword_foundright)) {
 412                         _rule.end = e;
 413                         found_right = 1;
 414                         _rule.border = RULE_ON_LEFT_BORDER;
 415                         _rule._context = count;
 416                         if (!r->between_delimiters)
 417                             if (!_rule.keyword) {
 418                                 _rule.context = count;
 419                                 contextchanged = 1;
 420                             }
 421                         break;
 422                     }
 423                 }
 424             }
 425         }
 426     }
 427
 428 /* check again to turn on a keyword if the context switched */
 429     if (contextchanged && !_rule.keyword) {
 430         const char *p;
 431
 432         p = (r = edit->rules[_rule.context])->keyword_first_chars;
 433         while (*(p = xx_strchr ((unsigned char *) p + 1, c))) {
 434             struct key_word *k;
 435             int count;
 436             long e;
 437
 438             count = p - r->keyword_first_chars;
 439             k = r->keyword[count];
 440             e = compare_word_to_right (edit, i, k->keyword, k->whole_word_chars_left, k->whole_word_chars_right, k->line_start);
 441             if (e > 0) {
 442                 _rule.end = e;
 443                 _rule.keyword = count;
 444                 break;
 445             }
 446         }
 447     }
 448     return _rule;
 449 }
 450
 451 static struct syntax_rule edit_get_rule (WEdit * edit, long byte_index)
 452 {
 453     long i;
 454
 455     if (byte_index > edit->last_get_rule) {
 456         for (i = edit->last_get_rule + 1; i <= byte_index; i++) {
 457             edit->rule = apply_rules_going_right (edit, i, edit->rule);
 458             if (i > (edit->syntax_marker ? edit->syntax_marker->offset + SYNTAX_MARKER_DENSITY : SYNTAX_MARKER_DENSITY)) {
 459                 struct _syntax_marker *s;
 460
 461                 s = edit->syntax_marker;
 462                 edit->syntax_marker = g_malloc0 (sizeof (struct _syntax_marker));
 463                 edit->syntax_marker->next = s;
 464                 edit->syntax_marker->offset = i;
 465                 edit->syntax_marker->rule = edit->rule;
 466             }
 467         }
 468     } else if (byte_index < edit->last_get_rule) {
 469         struct _syntax_marker *s;
 470
 471         for (;;) {
 472             if (!edit->syntax_marker) {
 473                 memset (&edit->rule, 0, sizeof (edit->rule));
 474                 for (i = -1; i <= byte_index; i++)
 475                     edit->rule = apply_rules_going_right (edit, i, edit->rule);
 476                 break;
 477             }
 478             if (byte_index >= edit->syntax_marker->offset) {
 479                 edit->rule = edit->syntax_marker->rule;
 480                 for (i = edit->syntax_marker->offset + 1; i <= byte_index; i++)
 481                     edit->rule = apply_rules_going_right (edit, i, edit->rule);
 482                 break;
 483             }
 484             s = edit->syntax_marker->next;
 485             MC_PTR_FREE (edit->syntax_marker);
 486             edit->syntax_marker = s;
 487         }
 488     }
 489     edit->last_get_rule = byte_index;
 490     return edit->rule;
 491 }
 492
 493 static void translate_rule_to_color (WEdit * edit, struct syntax_rule rule, int *color)
 494 {
 495     struct key_word *k;
 496
 497     k = edit->rules[rule.context]->keyword[rule.keyword];
 498     *color = k->color;
 499 }
 500
 501 void edit_get_syntax_color (WEdit * edit, long byte_index, int *color)
 502 {
 503     if (edit->rules && byte_index < edit->last_byte &&
 504                          option_syntax_highlighting && tty_use_colors ()) {
 505         translate_rule_to_color (edit, edit_get_rule (edit, byte_index), color);
 506     } else {
 507         *color = tty_use_colors () ? EDITOR_NORMAL_COLOR_INDEX : 0;
 508     }
 509 }
 510
 511
 512 /*
 513    Returns 0 on error/eof or a count of the number of bytes read
 514    including the newline. Result must be free'd.
 515    In case of an error, *line will not be modified.
 516  */
 517 static int read_one_line (char **line, FILE * f)
 518 {
 519     GString *p = g_string_new ("");
 520     int c, r = 0;
 521
 522     for (;;) {
 523         c = fgetc (f);
 524         if (c == EOF) {
 525             if (ferror (f)) {
 526                 if (errno == EINTR)
 527                     continue;
 528                 r = 0;
 529             }
 530             break;
 531         }
 532         r++;
 533         /* handle all of \r\n, \r, \n correctly. */
 534         if (c == '\r') {
 535             if ( (c = fgetc (f)) == '\n')
 536                 r++;
 537             else
 538                 ungetc (c, f);
 539             break;
 540         }
 541         if (c == '\n')
 542             break;
 543
 544         g_string_append_c (p, c);
 545     }
 546     if (r != 0) {
 547         *line = p->str;
 548         g_string_free (p, FALSE);
 549     } else {
 550         g_string_free (p, TRUE);
 551     }
 552     return r;
 553 }
 554
 555 static char *convert (char *s)
 556 {
 557     char *r, *p;
 558
 559     p = r = s;
 560     while (*s) {
 561         switch (*s) {
 562         case '\\':
 563             s++;
 564             switch (*s) {
 565             case ' ':
 566                 *p = ' ';
 567                 s--;
 568                 break;
 569             case 'n':
 570                 *p = '\n';
 571                 break;
 572             case 'r':
 573                 *p = '\r';
 574                 break;
 575             case 't':
 576                 *p = '\t';
 577                 break;
 578             case 's':
 579                 *p = ' ';
 580                 break;
 581             case '*':
 582                 *p = '*';
 583                 break;
 584             case '\\':
 585                 *p = '\\';
 586                 break;
 587             case '[':
 588             case ']':
 589                 *p = SYNTAX_TOKEN_BRACKET;
 590                 break;
 591             case '{':
 592             case '}':
 593                 *p = SYNTAX_TOKEN_BRACE;
 594                 break;
 595             case 0:
 596                 *p = *s;
 597                 return r;
 598             default:
 599                 *p = *s;
 600                 break;
 601             }
 602             break;
 603         case '*':
 604             *p = SYNTAX_TOKEN_STAR;
 605             break;
 606         case '+':
 607             *p = SYNTAX_TOKEN_PLUS;
 608             break;
 609         default:
 610             *p = *s;
 611             break;
 612         }
 613         s++;
 614         p++;
 615     }
 616     *p = '\0';
 617     return r;
 618 }
 619
 620 #define whiteness(x) ((x) == '\t' || (x) == '\n' || (x) == ' ')
 621
 622 static int get_args (char *l, char **args, int args_size)
 623 {
 624     int argc = 0;
 625
 626     while (argc < args_size) {
 627         char *p = l;
 628         while (*p && whiteness (*p))
 629             p++;
 630         if (!*p)
 631             break;
 632         for (l = p + 1; *l && !whiteness (*l); l++);
 633         if (*l)
 634             *l++ = '\0';
 635         args[argc++] = convert (p);
 636     }
 637     args[argc] = (char *) NULL;
 638     return argc;
 639 }
 640
 641 #define free_args(x)
 642 #define break_a {result=line;break;}
 643 #define check_a {if(!*a){result=line;break;}}
 644 #define check_not_a {if(*a){result=line;break;}}
 645
 646 static int
 647 this_try_alloc_color_pair (const char *fg, const char *bg)
 648 {
 649     char f[80], b[80], *p;
 650
 651     if (bg)
 652         if (!*bg)
 653             bg = 0;
 654     if (fg)
 655         if (!*fg)
 656             fg = 0;
 657     if (fg) {
 658         g_strlcpy (f, fg, sizeof (f));
 659         p = strchr (f, '/');
 660         if (p)
 661             *p = '\0';
 662         fg = f;
 663     }
 664     if (bg) {
 665         g_strlcpy (b, bg, sizeof (b));
 666         p = strchr (b, '/');
 667         if (p)
 668             *p = '\0';
 669         bg = b;
 670     }
 671     return tty_try_alloc_color_pair (fg, bg);
 672 }
 673
 674 static char *error_file_name = 0;
 675
 676 static FILE *open_include_file (const char *filename)
 677 {
 678     FILE *f;
 679
 680     MC_PTR_FREE (error_file_name);
 681     error_file_name = g_strdup (filename);
 682     if (*filename == PATH_SEP)
 683         return fopen (filename, "r");
 684
 685     g_free (error_file_name);
 686     error_file_name = g_strconcat (home_dir, PATH_SEP_STR EDIT_DIR PATH_SEP_STR,
 687                                    filename, (char *) NULL);
 688     f = fopen (error_file_name, "r");
 689     if (f)
 690         return f;
 691
 692     g_free (error_file_name);
 693     error_file_name = g_strconcat (mc_home, PATH_SEP_STR, "syntax", PATH_SEP_STR,
 694                                    filename, (char *) NULL);
 695
 696     if ((f = fopen (error_file_name, "r"))) {
 697         g_free (error_file_name);
 698         return f;
 699     }
 700     g_free (error_file_name);
 701     error_file_name = g_strconcat (mc_home_alt, PATH_SEP_STR "syntax" PATH_SEP_STR,
 702                                    filename, (char *) NULL);
 703
 704     return fopen (error_file_name, "r");
 705 }
 706
 707 /* returns line number on error */
 708 static int
 709 edit_read_syntax_rules (WEdit *edit, FILE *f, char **args, int args_size)
 710 {
 711     FILE *g = 0;
 712     char *fg, *bg;
 713     char last_fg[32] = "", last_bg[32] = "";
 714     char whole_right[512];
 715     char whole_left[512];
 716     char *l = 0;
 717     int save_line = 0, line = 0;
 718     struct context_rule **r, *c = 0;
 719     int num_words = -1, num_contexts = -1;
 720     int result = 0;
 721     int argc;
 722     int i, j;
 723     int alloc_contexts = MAX_CONTEXTS,
 724         alloc_words_per_context = MAX_WORDS_PER_CONTEXT,
 725         max_alloc_words_per_context = MAX_WORDS_PER_CONTEXT;
 726
 727     args[0] = 0;
 728
 729     strcpy (whole_left, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_01234567890");
 730     strcpy (whole_right, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_01234567890");
 731
 732     r = edit->rules = g_malloc0 (alloc_contexts * sizeof (struct context_rule *));
 733
 734     if (!edit->defines)
 735         edit->defines = g_tree_new ((GCompareFunc) strcmp);
 736
 737     for (;;) {
 738         char **a;
 739
 740         line++;
 741         l = 0;
 742         if (!read_one_line (&l, f)) {
 743             if (g) {
 744                 fclose (f);
 745                 f = g;
 746                 g = 0;
 747                 line = save_line + 1;
 748                 MC_PTR_FREE (error_file_name);
 749                 MC_PTR_FREE (l);
 750                 if (!read_one_line (&l, f))
 751                     break;
 752             } else {
 753                 break;
 754             }
 755         }
 756         argc = get_args (l, args, args_size);
 757         a = args + 1;
 758         if (!args[0]) {
 759             /* do nothing */
 760         } else if (!strcmp (args[0], "include")) {
 761             if (g || argc != 2) {
 762                 result = line;
 763                 break;
 764             }
 765             g = f;
 766             f = open_include_file (args[1]);
 767             if (!f) {
 768                 MC_PTR_FREE (error_file_name);
 769                 result = line;
 770                 break;
 771             }
 772             save_line = line;
 773             line = 0;
 774         } else if (!strcmp (args[0], "wholechars")) {
 775             check_a;
 776             if (!strcmp (*a, "left")) {
 777                 a++;
 778                 g_strlcpy (whole_left, *a, sizeof (whole_left));
 779             } else if (!strcmp (*a, "right")) {
 780                 a++;
 781                 g_strlcpy (whole_right, *a, sizeof (whole_right));
 782             } else {
 783                 g_strlcpy (whole_left, *a, sizeof (whole_left));
 784                 g_strlcpy (whole_right, *a, sizeof (whole_right));
 785             }
 786             a++;
 787             check_not_a;
 788         } else if (!strcmp (args[0], "context")) {
 789             check_a;
 790             if (num_contexts == -1) {
 791                 if (strcmp (*a, "default")) {   /* first context is the default */
 792                     break_a;
 793                 }
 794                 a++;
 795                 c = r[0] = g_malloc0 (sizeof (struct context_rule));
 796                 c->left = g_strdup (" ");
 797                 c->right = g_strdup (" ");
 798                 num_contexts = 0;
 799             } else {
 800                 /* Terminate previous context.  */
 801                 r[num_contexts - 1]->keyword[num_words] = NULL;
 802                 c = r[num_contexts] = g_malloc0 (sizeof (struct context_rule));
 803                 if (!strcmp (*a, "exclusive")) {
 804                     a++;
 805                     c->between_delimiters = 1;
 806                 }
 807                 check_a;
 808                 if (!strcmp (*a, "whole")) {
 809                     a++;
 810                     c->whole_word_chars_left = g_strdup (whole_left);
 811                     c->whole_word_chars_right = g_strdup (whole_right);
 812                 } else if (!strcmp (*a, "wholeleft")) {
 813                     a++;
 814                     c->whole_word_chars_left = g_strdup (whole_left);
 815                 } else if (!strcmp (*a, "wholeright")) {
 816                     a++;
 817                     c->whole_word_chars_right = g_strdup (whole_right);
 818                 }
 819                 check_a;
 820                 if (!strcmp (*a, "linestart")) {
 821                     a++;
 822                     c->line_start_left = 1;
 823                 }
 824                 check_a;
 825                 c->left = g_strdup (*a++);
 826                 check_a;
 827                 if (!strcmp (*a, "linestart")) {
 828                     a++;
 829                     c->line_start_right = 1;
 830                 }
 831                 check_a;
 832                 c->right = g_strdup (*a++);
 833                 c->first_left = *c->left;
 834                 c->first_right = *c->right;
 835             }
 836             c->keyword = g_malloc (alloc_words_per_context * sizeof (struct key_word *));
 837             num_words = 1;
 838             c->keyword[0] = g_malloc0 (sizeof (struct key_word));
 839             subst_defines (edit->defines, a, &args[1024]);
 840             fg = *a;
 841             if (*a)
 842                 a++;
 843             bg = *a;
 844             if (*a)
 845                 a++;
 846             g_strlcpy (last_fg, fg ? fg : "", sizeof (last_fg));
 847             g_strlcpy (last_bg, bg ? bg : "", sizeof (last_bg));
 848             c->keyword[0]->color = this_try_alloc_color_pair (fg, bg);
 849             c->keyword[0]->keyword = g_strdup (" ");
 850             check_not_a;
 851
 852             alloc_words_per_context = MAX_WORDS_PER_CONTEXT;
 853             if (++num_contexts >= alloc_contexts) {
 854                 struct context_rule **tmp;
 855
 856                 alloc_contexts += 128;
 857                 tmp = g_realloc (r, alloc_contexts * sizeof (struct context_rule *));
 858                 r = tmp;
 859             }
 860         } else if (!strcmp (args[0], "spellcheck")) {
 861             if (!c) {
 862                 result = line;
 863                 break;
 864             }
 865             c->spelling = 1;
 866         } else if (!strcmp (args[0], "keyword")) {
 867             struct key_word *k;
 868
 869             if (num_words == -1)
 870                 break_a;
 871             check_a;
 872             k = r[num_contexts - 1]->keyword[num_words] = g_malloc0 (sizeof (struct key_word));
 873             if (!strcmp (*a, "whole")) {
 874                 a++;
 875                 k->whole_word_chars_left = g_strdup (whole_left);
 876                 k->whole_word_chars_right = g_strdup (whole_right);
 877             } else if (!strcmp (*a, "wholeleft")) {
 878                 a++;
 879                 k->whole_word_chars_left = g_strdup (whole_left);
 880             } else if (!strcmp (*a, "wholeright")) {
 881                 a++;
 882                 k->whole_word_chars_right = g_strdup (whole_right);
 883             }
 884             check_a;
 885             if (!strcmp (*a, "linestart")) {
 886                 a++;
 887                 k->line_start = 1;
 888             }
 889             check_a;
 890             if (!strcmp (*a, "whole")) {
 891                 break_a;
 892             }
 893             k->keyword = g_strdup (*a++);
 894             k->first = *k->keyword;
 895             subst_defines (edit->defines, a, &args[1024]);
 896             fg = *a;
 897             if (*a)
 898                 a++;
 899             bg = *a;
 900             if (*a)
 901                 a++;
 902             if (!fg)
 903                 fg = last_fg;
 904             if (!bg)
 905                 bg = last_bg;
 906             k->color = this_try_alloc_color_pair (fg, bg);
 907             check_not_a;
 908
 909             if (++num_words >= alloc_words_per_context) {
 910                 struct key_word **tmp;
 911
 912                 alloc_words_per_context += 1024;
 913
 914                 if (alloc_words_per_context > max_alloc_words_per_context)
 915                     max_alloc_words_per_context = alloc_words_per_context;
 916
 917                 tmp = g_realloc (c->keyword, alloc_words_per_context * sizeof (struct key_word *));
 918                 c->keyword = tmp;
 919             }
 920         } else if (*(args[0]) == '#') {
 921             /* do nothing for comment */
 922         } else if (!strcmp (args[0], "file")) {
 923             break;
 924         } else if (!strcmp (args[0], "define")) {
 925             char *key = *a++;
 926             char **argv;
 927
 928             if (argc < 3)
 929                 break_a;
 930             if ((argv = g_tree_lookup (edit->defines, key))) {
 931                 mc_defines_destroy (NULL, argv, NULL);
 932             } else {
 933                 key = g_strdup (key);
 934             }
 935             argv = g_new (char *, argc - 1);
 936             g_tree_insert (edit->defines, key, argv);
 937             while (*a) {
 938                 *argv++ = g_strdup (*a++);
 939             };
 940             *argv = NULL;
 941         } else {                /* anything else is an error */
 942             break_a;
 943         }
 944         free_args (args);
 945         MC_PTR_FREE (l);
 946     }
 947     free_args (args);
 948     MC_PTR_FREE (l);
 949
 950     /* Terminate context array.  */
 951     if (num_contexts > 0) {
 952         r[num_contexts - 1]->keyword[num_words] = NULL;
 953         r[num_contexts] = NULL;
 954     }
 955
 956     if (!edit->rules[0])
 957         MC_PTR_FREE (edit->rules);
 958
 959     if (result)
 960         return result;
 961
 962     if (num_contexts == -1) {
 963         return line;
 964     }
 965
 966     {
 967         char *first_chars, *p;
 968
 969         first_chars = g_malloc (max_alloc_words_per_context + 2);
 970
 971         for (i = 0; edit->rules[i]; i++) {
 972             c = edit->rules[i];
 973             p = first_chars;
 974             *p++ = (char) 1;
 975             for (j = 1; c->keyword[j]; j++)
 976                 *p++ = c->keyword[j]->first;
 977             *p = '\0';
 978             c->keyword_first_chars = g_strdup (first_chars);
 979         }
 980
 981         g_free (first_chars);
 982     }
 983
 984     return result;
 985 }
 986
 987 void edit_free_syntax_rules (WEdit * edit)
 988 {
 989     int i, j;
 990
 991     if (!edit)
 992         return;
 993     if (edit->defines)
 994         destroy_defines (&edit->defines);
 995     if (!edit->rules)
 996         return;
 997
 998     edit_get_rule (edit, -1);
 999     MC_PTR_FREE (edit->syntax_type);
1000     edit->syntax_type = 0;
1001
1002     for (i = 0; edit->rules[i]; i++) {
1003         if (edit->rules[i]->keyword) {
1004             for (j = 0; edit->rules[i]->keyword[j]; j++) {
1005                 MC_PTR_FREE (edit->rules[i]->keyword[j]->keyword);
1006                 MC_PTR_FREE (edit->rules[i]->keyword[j]->whole_word_chars_left);
1007                 MC_PTR_FREE (edit->rules[i]->keyword[j]->whole_word_chars_right);
1008                 MC_PTR_FREE (edit->rules[i]->keyword[j]);
1009             }
1010         }
1011         MC_PTR_FREE (edit->rules[i]->left);
1012         MC_PTR_FREE (edit->rules[i]->right);
1013         MC_PTR_FREE (edit->rules[i]->whole_word_chars_left);
1014         MC_PTR_FREE (edit->rules[i]->whole_word_chars_right);
1015         MC_PTR_FREE (edit->rules[i]->keyword);
1016         MC_PTR_FREE (edit->rules[i]->keyword_first_chars);
1017         MC_PTR_FREE (edit->rules[i]);
1018     }
1019
1020     while (edit->syntax_marker) {
1021         struct _syntax_marker *s = edit->syntax_marker->next;
1022         MC_PTR_FREE (edit->syntax_marker);
1023         edit->syntax_marker = s;
1024     }
1025
1026     MC_PTR_FREE (edit->rules);
1027 }
1028
1029 /* returns -1 on file error, line number on error in file syntax */
1030 static int
1031 edit_read_syntax_file (WEdit * edit, char ***pnames, const char *syntax_file,
1032                        const char *editor_file, const char *first_line,
1033                        const char *type)
1034 {
1035 #define NENTRIES 30
1036     FILE *f, *g = NULL;
1037     char *args[1024], *l = 0;
1038     int line = 0;
1039     int result = 0;
1040     int count = 0;
1041     char *lib_file;
1042     int found = 0;
1043     char **tmpnames = NULL;
1044
1045     f = fopen (syntax_file, "r");
1046     if (!f){
1047         lib_file = concat_dir_and_file (mc_home, "Syntax");
1048         f = fopen (lib_file, "r");
1049         g_free (lib_file);
1050         if (!f)
1051             return -1;
1052     }
1053
1054     args[0] = 0;
1055     for (;;) {
1056         line++;
1057         MC_PTR_FREE (l);
1058         if (!read_one_line (&l, f))
1059             break;
1060         (void)get_args (l, args, 1023); /* Final NULL */
1061         if (!args[0])
1062             continue;
1063
1064 /* Looking for `include ...` lines before first `file ...` ones */
1065         if (!found && !strcmp (args[0], "include")) {
1066             if (g)
1067                 continue;
1068             if (!args[1] || !(g = open_include_file (args[1]))) {
1069                 result = line;
1070                 break;
1071             }
1072             goto found_type;
1073         }
1074
1075 /* looking for `file ...' lines only */
1076         if (strcmp (args[0], "file")) {
1077             continue;
1078         }
1079         found = 1;
1080
1081 /* must have two args or report error */
1082         if (!args[1] || !args[2]) {
1083             result = line;
1084             break;
1085         }
1086         if (pnames && *pnames) {
1087
1088 /* 1: just collecting a list of names of rule sets */
1089 /* Reallocate the list if required */
1090             if (count % NENTRIES == 0) {
1091                 if ((tmpnames = (char**) g_realloc (*pnames, (count + NENTRIES
1092                     + 1) * sizeof (char*))) != NULL)
1093                     *pnames = tmpnames;
1094                 else
1095                     abort ();
1096             }
1097             (*pnames)[count++] = g_strdup (args[2]);
1098             (*pnames)[count] = NULL;
1099         } else if (type) {
1100
1101 /* 2: rule set was explicitly specified by the caller */
1102             if (!strcmp (type, args[2]))
1103                 goto found_type;
1104         } else if (editor_file && edit) {
1105
1106 /* 3: auto-detect rule set from regular expressions */
1107             int q;
1108             q = mc_search(args[1], editor_file, MC_SEARCH_T_REGEX);
1109 /* does filename match arg 1 ? */
1110             if (!q && args[3]) {
1111 /* does first line match arg 3 ? */
1112                 q = mc_search(args[3], first_line, MC_SEARCH_T_REGEX);
1113             }
1114             if (q) {
1115                 int line_error;
1116                 char *syntax_type;
1117               found_type:
1118                 syntax_type = args[2];
1119                 line_error = edit_read_syntax_rules (edit, g ? g : f, args, 1023);
1120                 if (line_error) {
1121                     if (!error_file_name)       /* an included file */
1122                         result = line + line_error;
1123                     else
1124                         result = line_error;
1125                 } else {
1126                     MC_PTR_FREE (edit->syntax_type);
1127                     edit->syntax_type = g_strdup (syntax_type);
1128 /* if there are no rules then turn off syntax highlighting for speed */
1129                     if (!g && !edit->rules[1])
1130                         if (!edit->rules[0]->keyword[1] && !edit->rules[0]->spelling) {
1131                             edit_free_syntax_rules (edit);
1132                             break;
1133                         }
1134                 }
1135                 if (g) {
1136                     fclose (g);
1137                     g = NULL;
1138                 } else {
1139                     break;
1140                 }
1141             }
1142         }
1143     }
1144     MC_PTR_FREE (l);
1145     fclose (f);
1146     return result;
1147 }
1148
1149 static char *get_first_editor_line (WEdit * edit)
1150 {
1151     int i;
1152     static char s[256];
1153
1154     s[0] = '\0';
1155     if (!edit)
1156         return s;
1157     for (i = 0; i < 255; i++) {
1158         s[i] = edit_get_byte (edit, i);
1159         if (s[i] == '\n') {
1160             s[i] = '\0';
1161             break;
1162         }
1163     }
1164     s[255] = '\0';
1165     return s;
1166 }
1167
1168 /*
1169  * Load rules into edit struct.  Either edit or *pnames must be NULL.  If
1170  * edit is NULL, a list of types will be stored into names.  If type is
1171  * NULL, then the type will be selected according to the filename.
1172  */
1173 void
1174 edit_load_syntax (WEdit *edit, char ***pnames, const char *type)
1175 {
1176     int r;
1177     char *f = NULL;
1178
1179     if (option_auto_syntax)
1180         type = NULL;
1181
1182     edit_free_syntax_rules (edit);
1183
1184     if (!tty_use_colors ())
1185         return;
1186
1187     if (!option_syntax_highlighting && (!pnames || !*pnames))
1188         return;
1189
1190     if (edit) {
1191         if (!edit->filename)
1192             return;
1193         if (!*edit->filename && !type)
1194             return;
1195     }
1196     f = concat_dir_and_file (home_dir, EDIT_SYNTAX_FILE);
1197     r = edit_read_syntax_file (edit, pnames, f, edit ? edit->filename : 0,
1198                                get_first_editor_line (edit), type);
1199     if (r == -1) {
1200         edit_free_syntax_rules (edit);
1201         message (D_ERROR, _(" Load syntax file "),
1202                  _(" Cannot open file %s \n %s "), f,
1203                  unix_error_string (errno));
1204     } else if (r) {
1205         edit_free_syntax_rules (edit);
1206         message (D_ERROR, _(" Load syntax file "),
1207                  _(" Error in file %s on line %d "),
1208                  error_file_name ? error_file_name : f, r);
1209         MC_PTR_FREE (error_file_name);
1210     } else {
1211         /* succeeded */
1212     }
1213     g_free (f);
1214 }
1215
1216 const char *
1217 edit_get_syntax_type (const WEdit *edit)
1218 {
1219     return edit->syntax_type;
1220 }