gsoc2013-evolution - Google Summer of Code 2013 - GNOME

about summary refs log tree commit diff stats

diff options

-rw-r--r--

2 files changed, 2 insertions, 2 deletions

'#n143'>143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>  
 *
 *
 * Authors:
 * Developed by Jon Trowbridge <trow@ximian.com>
 * Rewritten significantly to handle multiple strings and improve performance
 * by Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "e-searching-tokenizer.h"

#include "libedataserver/e-memory.h"
#include "libedataserver/e-msgport.h"

#define d(x)

enum {
    MATCH_SIGNAL,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0, };

static void     e_searching_tokenizer_begin      (HTMLTokenizer *, char *);
static void     e_searching_tokenizer_end        (HTMLTokenizer *);
static char    *e_searching_tokenizer_peek_token (HTMLTokenizer *);
static char    *e_searching_tokenizer_next_token (HTMLTokenizer *);
static gboolean e_searching_tokenizer_has_more   (HTMLTokenizer *);

static HTMLTokenizer *e_searching_tokenizer_clone (HTMLTokenizer *);

/*
  static const gchar *space_tags[] = { "br", NULL };*/

static HTMLTokenizerClass *parent_class = NULL;

/** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/

/* ???
typedef struct _SharedState SharedState;
struct _SharedState {
    gint refs;
    gchar *str_primary;
    gchar *str_secondary;
    gboolean case_sensitive_primary;
    gboolean case_sensitive_secondary;
};
*/

/* ********************************************************************** */


#if 0
static SharedState *
shared_state_new (void)
{
    SharedState *shared = g_new0 (SharedState, 1);
    shared->refs = 1;
    return shared;
}

static void
shared_state_ref (SharedState *shared)
{
    g_return_if_fail (shared != NULL);
    g_return_if_fail (shared->refs > 0);
    ++shared->refs;
}

static void
shared_state_unref (SharedState *shared)
{
    if (shared) {
        g_return_if_fail (shared->refs > 0);
        --shared->refs;
        if (shared->refs == 0) {
            g_free (shared->str_primary);
            g_free (shared->str_secondary);
            g_free (shared);
        }
    }
}
#endif

/** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/

/* ********************************************************************** */

/* Utility functions */

/* This is faster and safer than glib2's utf8 abomination, but isn't exported from camel as yet */
static inline guint32
camel_utf8_getc(const unsigned char **ptr)
{
    register unsigned char *p = (unsigned char *)*ptr;
    register unsigned char c, r;
    register guint32 v, m;

again:
    r = *p++;
loop:
    if (r < 0x80) {
        *ptr = p;
        v = r;
    } else if (r < 0xfe) { /* valid start char? */
        v = r;
        m = 0x7f80; /* used to mask out the length bits */
        do {
            c = *p++;
            if ((c & 0xc0) != 0x80) {
                r = c;
                goto loop;
            }
            v = (v<<6) | (c & 0x3f);
            r<<=1;
            m<<=5;
        } while (r & 0x40);

        *ptr = p;

        v &= ~m;
    } else {
        goto again;
    }

    return v;
}


/* note: our tags of interest are 7 bit ascii, only, no need to do any fancy utf8 stuff */
/* tags should be upper case
   if this list gets longer than 10 entries, consider binary search */
static char *ignored_tags[] = { "B", "I", "FONT", "TT", "EM", /* and more? */};

static int
ignore_tag (const char *tag)
{
    char *t = alloca(strlen(tag)+1), c, *out;
    const char *in;
    int i;

    /* we could use a aho-corasick matcher here too ... but we wont */

    /* normalise tag into 't'.
       Note we use the property that the only tags we're interested in
       are 7 bit ascii to shortcut and simplify case insensitivity */
    in = tag+2;     /* skip: TAG_ESCAPE '<' */
    if (*in == '/')
        in++;
    out = t;
    while ((c = *in++)) {
        if (c >= 'A' && c <= 'Z')
            *out++ = c;
        else if (c >= 'a' && c <= 'z')
            *out++ = c & 0xdf; /* convert ASCII to upper case */
        else
            /* maybe should check for > or ' ' etc? */
            break;
    }
    *out = 0;

    for (i=0;i<sizeof(ignored_tags)/sizeof(ignored_tags[0]);i++) {
        if (strcmp(t, ignored_tags[i]) == 0)
            return 1;
    }

    return 0;
}

/* ********************************************************************** */

/* Aho-Corasick search tree implmeentation */

/* next state if we match a character */
struct _match {
    struct _match *next;
    guint32 ch;
    struct _state *match;
};

/* tree state node */
struct _state {
    struct _match *matches;
    unsigned int final;     /* max no of chars we just matched */
    struct _state *fail;        /* where to try next if we fail */
    struct _state *next;        /* next on this level? */
};

/* base tree structure */
struct _trie {
    struct _state root;
    int max_depth;

    EMemChunk *state_chunks;
    EMemChunk *match_chunks;
};

/* will be enabled only if debug is enabled */
#if d(1) -1 != -1
static void
dump_trie(struct _state *s, int d)
{
    char *p = alloca(d*2+1);
    struct _match *m;

    memset(p, ' ', d*2);
    p[d*2]=0;

    printf("%s[state] %p: %d  fail->%p\n", p, s, s->final, s->fail);
    m = s->matches;
    while (m) {
        printf(" %s'%c' -> %p\n", p, m->ch, m->match);
        if (m->match)
            dump_trie(m->match, d+1);
        m = m->next;
    }
}
#endif

/* This builds an Aho-Corasick search trie for a set of utf8 words */
/* See
    http://www-sr.informatik.uni-tuebingen.de/~buehler/AC/AC.html
   for a neat demo */

static inline struct _match *
g(struct _state *q, guint32 c)
{
    struct _match *m = q->matches;

    while (m && m->ch != c)
        m = m->next;

    return m;
}

static struct _trie *
build_trie(int nocase, int len, unsigned char **words)
{
    struct _state *q, *qt, *r;
    const unsigned char *word;
    struct _match *m, *n = NULL;
    int i, depth;
    guint32 c;
    struct _trie *trie;
    int state_depth_max, state_depth_size;
    struct _state **state_depth;

    trie = g_malloc(sizeof(*trie));
    trie->root.matches = NULL;
    trie->root.final = 0;
    trie->root.fail = NULL;
    trie->root.next = NULL;

    trie->state_chunks = e_memchunk_new(8, sizeof(struct _state));
    trie->match_chunks = e_memchunk_new(8, sizeof(struct _match));

    /* This will correspond to the length of the longest pattern */
    state_depth_size = 0;
    state_depth_max = 64;
    state_depth = g_malloc(sizeof(*state_depth[0])*64);
    state_depth[0] = NULL;

    /* Step 1: Build trie */

    /* This just builds a tree that merges all common prefixes into the same branch */

    for (i=0;i<len;i++) {
        word = words[i];
        q = &trie->root;
        depth = 0;
        while ((c = camel_utf8_getc (&word))) {
            if (nocase)
                c = g_unichar_tolower(c);
            m = g(q, c);
            if (m == NULL) {
                m = e_memchunk_alloc(trie->match_chunks);
                m->ch = c;
                m->next = q->matches;
                q->matches = m;
                q = m->match = e_memchunk_alloc(trie->state_chunks);
                q->matches = NULL;
                q->fail = &trie->root;
                q->final = 0;
                if (state_depth_max < depth) {
                    state_depth_max += 64;
                    state_depth = g_realloc(state_depth, sizeof(*state_depth[0])*state_depth_max);
                }
                if (state_depth_size < depth) {
                    state_depth[depth] = NULL;
                    state_depth_size = depth;
                }
                q->next = state_depth[depth];
                state_depth[depth] = q;
            } else {
                q = m->match;
            }
            depth++;
        }
        q->final = depth;
    }

    d(printf("Dumping trie:\n"));
    d(dump_trie(&trie->root, 0));

    /* Step 2: Build failure graph */

    /* This searches for the longest substring which is a prefix of another string and
       builds a graph of failure links so you can find multiple substrings concurrently,
       using aho-corasick's algorithm */

    for (i=0;i<state_depth_size;i++) {
        q = state_depth[i];
        while (q) {
            m = q->matches;
            while (m) {
                c = m->ch;
                qt = m->match;
                r = q->fail;
                while (r && (n = g(r, c)) == NULL)
                    r = r->fail;
                if (r != NULL) {
                    qt->fail = n->match;
                    if (qt->fail->final > qt->final)
                        qt->final = qt->fail->final;
                } else {
                    if ((n = g(&trie->root, c)))
                        qt->fail = n->match;
                    else
                        qt->fail = &trie->root;
                }
                m = m->next;
            }
            q = q->next;
        }
    }

    d(printf("After failure analysis\n"));
    d(dump_trie(&trie->root, 0));

    g_free(state_depth);

    trie->max_depth = state_depth_size;

    return trie;
}

static void
free_trie(struct _trie *t)
{
    e_memchunk_destroy(t->match_chunks);
    e_memchunk_destroy(t->state_chunks);

    g_free(t);
}

/* ********************************************************************** */

/* html token searcher */

struct _token {
    struct _token *next;
    struct _token *prev;
    unsigned int offset;
    /* we need to copy the token for memory management, so why not copy it whole */
    char tok[1];
};

/* stack of submatches currently being scanned, used for merging */
struct _submatch {
    unsigned int offstart, offend; /* in bytes */
};

/* flags for new func */
#define SEARCH_CASE (1)
#define SEARCH_BOLD (2)

struct _searcher {
    struct _trie *t;

    char *(*next_token)();  /* callbacks for more tokens */
    void *next_data;

    int words;      /* how many words */
    char *tags, *tage;  /* the tag we used to highlight */

    int flags;      /* case sensitive or not */

    struct _state *state;   /* state is the current trie state */

    int matchcount;

    EDList input;       /* pending 'input' tokens, processed but might match */
    EDList output;      /* output tokens ready for source */

    struct _token *current; /* for token output memory management */

    guint32 offset;     /* current offset through searchable stream? */
    guint32 offout;     /* last output position */

    unsigned int lastp; /* current position in rotating last buffer */
    guint32 *last;      /* buffer that goes back last 'n' positions */
    guint32 last_mask;  /* bitmask for efficient rotation calculation */

    unsigned int submatchp; /* submatch stack */
    struct _submatch *submatches;
};

static void
searcher_set_tokenfunc(struct _searcher *s, char *(*next)(), void *data)
{
    s->next_token = next;
    s->next_data = data;
}

static struct _searcher *
searcher_new (int flags, int argc, unsigned char **argv, const char *tags, const char *tage)
{
    int i, m;
    struct _searcher *s;

    s = g_malloc(sizeof(*s));

    s->t = build_trie((flags&SEARCH_CASE) == 0, argc, argv);
    s->words = argc;
    s->tags = g_strdup(tags);
    s->tage = g_strdup(tage);
    s->flags = flags;
    s->state = &s->t->root;
    s->matchcount = 0;

    e_dlist_init(&s->input);
    e_dlist_init(&s->output);
    s->current = NULL;

    s->offset = 0;
    s->offout = 0;

    /* rotating queue of previous character positions */
    m = s->t->max_depth+1;
    i = 2;
    while (i<m)
        i<<=2;
    s->last = g_malloc(sizeof(s->last[0])*i);
    s->last_mask = i-1;
    s->lastp = 0;

    /* a stack of possible submatches */
    s->submatchp = 0;
    s->submatches = g_malloc(sizeof(s->submatches[0])*argc+1);

    return s;
}

static void
searcher_free(struct _searcher *s)
{
    struct _token *t;

    while ((t = (struct _token *)e_dlist_remhead(&s->input)))
        g_free(t);
    while ((t = (struct _token *)e_dlist_remhead(&s->output)))
        g_free(t);
    g_free(s->tags);
    g_free(s->tage);
    g_free(s->last);
    g_free(s->submatches);
    free_trie(s->t);
    g_free(s);
}
static struct _token *
append_token(EDList *list, const char *tok, int len)
{
    struct _token *token;

    if (len == -1)
        len = strlen(tok);
    token = g_malloc(sizeof(*token) + len+1);
    token->offset = 0;  /* set by caller when required */
    memcpy(token->tok, tok, len);
    token->tok[len] = 0;
    e_dlist_addtail(list, (EDListNode *)token);

    return token;
}

#define free_token(x) (g_free(x))

static void
output_token(struct _searcher *s, struct _token *token)
{
    int offend;
    int left, pre;

    if (token->tok[0] == TAG_ESCAPE) {
        if (token->offset >= s->offout) {
            d(printf("moving tag token '%s' from input to output\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
            e_dlist_addtail(&s->output, (EDListNode *)token);
        } else {
            d(printf("discarding tag token '%s' from input\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
            free_token(token);
        }
    } else {
        offend = token->offset + strlen(token->tok);
        left = offend-s->offout;
        if (left > 0) {
            pre = s->offout - token->offset;
            if (pre>0)
                memmove(token->tok, token->tok+pre, left+1);
            d(printf("adding partial remaining/failed '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
            s->offout = offend;
            e_dlist_addtail(&s->output, (EDListNode *)token);
        } else {
            d(printf("discarding whole token '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
            free_token(token);
        }
    }
}

static struct _token *
find_token(struct _searcher *s, int start)
{
    register struct _token *token;

    /* find token which is start token, from end of list back */
    token = (struct _token *)s->input.tailpred;
    while (token->prev) {
        if (token->offset <= start)
            return token;
        token = token->prev;
    }

    return NULL;
}

static void
output_match(struct _searcher *s, unsigned int start, unsigned int end)
{
    register struct _token *token;
    struct _token *starttoken, *endtoken;
    char b[8];

    d(printf("output match: %d-%d  at %d\n", start, end, s->offout));

    starttoken = find_token(s, start);
    endtoken = find_token(s, end);

    if (starttoken == NULL || endtoken == NULL) {
        d(printf("Cannot find match history for match %d-%d\n", start, end));
        return;
    }

    d(printf("start in token '%s'\n", starttoken->tok[0]==TAG_ESCAPE?starttoken->tok+1:starttoken->tok));
    d(printf("end in token   '%s'\n", endtoken->tok[0]==TAG_ESCAPE?endtoken->tok+1:endtoken->tok));

    /* output pending stuff that didn't match afterall */
    while ((struct _token *)s->input.head != starttoken) {
        token = (struct _token *)e_dlist_remhead(&s->input);
        d(printf("appending failed match '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
        output_token(s, token);
    }

    /* output any pre-match text */
    if (s->offout < start) {
        token = append_token(&s->output, starttoken->tok + (s->offout-starttoken->offset), start-s->offout);
        d(printf("adding pre-match text '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
        s->offout = start;
    }

    /* output highlight/bold */
    if (s->flags & SEARCH_BOLD) {
        sprintf(b, "%c<b>", (char)TAG_ESCAPE);
        append_token(&s->output, b, -1);
    }
    if (s->tags)
        append_token(&s->output, s->tags, -1);

    /* output match node(s) */
    if (starttoken != endtoken) {
        while ((struct _token *)s->input.head != endtoken) {
            token = (struct _token *)e_dlist_remhead(&s->input);
            d(printf("appending (partial) match node (head) '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
            output_token(s, token);
        }
    }

    /* any remaining partial content */
    if (s->offout < end) {
        token = append_token(&s->output, endtoken->tok+(s->offout-endtoken->offset), end-s->offout);
        d(printf("appending (partial) match node (tail) '%s'\n", token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));
        s->offout = end;
    }

    /* end highlight */
    if (s->tage)
        append_token(&s->output, s->tage, -1);

    /* and close bold if we need to */
    if (s->flags & SEARCH_BOLD) {
        sprintf(b, "%c</b>", (char)TAG_ESCAPE);
        append_token(&s->output, b, -1);
    }
}

/* output any sub-pending blocks */
static void
output_subpending(struct _searcher *s)
{
    int i;

    for (i=s->submatchp-1;i>=0;i--)
        output_match(s, s->submatches[i].offstart, s->submatches[i].offend);
    s->submatchp = 0;
}

/* returns true if a merge took place */
static int
merge_subpending(struct _searcher *s, int offstart, int offend)
{
    int i;

    /* merges overlapping or abutting match strings */
    if (s->submatchp &&
        s->submatches[s->submatchp-1].offend >= offstart) {

        /* go from end, any that match 'invalidate' follow-on ones too */
        for (i=s->submatchp-1;i>=0;i--) {
            if (s->submatches[i].offend >= offstart) {
                if (offstart < s->submatches[i].offstart)
                    s->submatches[i].offstart = offstart;
                s->submatches[i].offend = offend;
                if (s->submatchp > i)
                    s->submatchp = i+1;
            }
        }
        return 1;
    }

    return 0;
}

static void
push_subpending(struct _searcher *s, int offstart, int offend)
{
    /* This is really an assertion, we just ignore the last pending match instead of crashing though */
    if (s->submatchp >= s->words) {
        d(printf("ERROR: submatch pending stack overflow\n"));
        s->submatchp = s->words-1;
    }

    s->submatches[s->submatchp].offstart = offstart;
    s->submatches[s->submatchp].offend = offend;
    s->submatchp++;
}

/* move any (partial) tokens from input to output if they are beyond the current output position */
static void
output_pending(struct _searcher *s)
{
    struct _token *token;

    while ( (token = (struct _token *)e_dlist_remhead(&s->input)) )
        output_token(s, token);
}

/* flushes any nodes we cannot possibly match anymore */
static void
flush_extra(struct _searcher *s)
{
    unsigned int start;
    int i;
    struct _token *starttoken, *token;

    /* find earliest char that can be in contention */
    start = s->offset - s->t->max_depth;
    for (i=0;i<s->submatchp;i++)
        if (s->submatches[i].offstart < start)
            start = s->submatches[i].offstart;

    /* now, flush out any tokens which are before this point */
    starttoken = find_token(s, start);
    if (starttoken == NULL)
        return;

    while ((struct _token *)s->input.head != starttoken) {
        token = (struct _token *)e_dlist_remhead(&s->input);
        output_token(s, token);
    }
}

static char *
searcher_next_token(struct _searcher *s)
{
    struct _token *token;
    const unsigned char *tok, *stok, *pre_tok;
    struct _trie *t = s->t;
    struct _state *q = s->state;
    struct _match *m = NULL;
    int offstart, offend;
    guint32 c;

    while (e_dlist_empty(&s->output)) {
        /* get next token */
        tok = (unsigned char *)s->next_token(s->next_data);
        if (tok == NULL) {
            output_subpending(s);
            output_pending(s);
            break;
        }

        /* we dont always have to copy each token, e.g. if we dont match anything */
        token = append_token(&s->input, (char *)tok, -1);
        token->offset = s->offset;
        tok = (unsigned char *)token->tok;

        d(printf("new token %d '%s'\n", token->offset, token->tok[0]==TAG_ESCAPE?token->tok+1:token->tok));

        /* tag test, reset state on unknown tags */
        if (tok[0] == TAG_ESCAPE) {
            if (!ignore_tag ((char *)tok)) {
                /* force reset */
                output_subpending(s);
                output_pending(s);
                q = &t->root;
            }

            continue;
        }

        /* process whole token */
        pre_tok = stok = tok;
        while ((c = camel_utf8_getc (&tok))) {
            if ((s->flags & SEARCH_CASE) == 0)
                c = g_unichar_tolower(c);
            while (q && (m = g(q, c)) == NULL)
                q = q->fail;
            if (q == NULL) {
                /* mismatch ... reset state */
                output_subpending(s);
                q = &t->root;
            } else if (m != NULL) {
                /* keep track of previous offsets of utf8 chars, rotating buffer */
                s->last[s->lastp] = s->offset + (pre_tok-stok);
                s->lastp = (s->lastp+1)&s->last_mask;

                q = m->match;
                /* we have a match of q->final characters for a matching word */
                if (q->final) {
                    s->matchcount++;

                    /* use the last buffer to find the real offset of this char */
                    offstart = s->last[(s->lastp - q->final)&s->last_mask];
                    offend = s->offset + (tok - stok);

                    if (q->matches == NULL) {
                        if (s->submatchp == 0) {
                            /* nothing pending, always put something in so we can try merge */
                            push_subpending(s, offstart, offend);
                        } else if (!merge_subpending(s, offstart, offend)) {
                            /* can't merge, output what we have, and start againt */
                            output_subpending(s);
                            push_subpending(s, offstart, offend);
                            /*output_match(s, offstart, offend);*/
                        } else if (e_dlist_length(&s->input) > 8) {
                            /* we're continuing to match and merge, but we have a lot of stuff
                               waiting, so flush it out now since this is a safe point to do it */
                            output_subpending(s);
                        }
                    } else {
                        /* merge/add subpending */
                        if (!merge_subpending(s, offstart, offend))
                            push_subpending(s, offstart, offend);
                    }
                }
            }
            pre_tok = tok;
        }

        s->offset += (pre_tok-stok);

        flush_extra(s);
    }

    s->state = q;

    if (s->current)
        free_token(s->current);

    s->current = token = (struct _token *)e_dlist_remhead(&s->output);

    return token?token->tok:NULL;
}

static char *
searcher_peek_token(struct _searcher *s)
{
    char *tok;

    /* we just get it and then put it back, it's fast enuf */
    tok = searcher_next_token(s);
    if (tok) {
        /* need to clear this so we dont free it while its still active */
        e_dlist_addhead(&s->output, (EDListNode *)s->current);
        s->current = NULL;
    }

    return tok;
}

static int
searcher_pending(struct _searcher *s)
{
    return !(e_dlist_empty(&s->input) && e_dlist_empty(&s->output));
}

/* ********************************************************************** */

struct _search_info {
    GPtrArray *strv;
    char *colour;
    unsigned int size:8;
    unsigned int flags:8;
};

/** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/

static struct _search_info *
search_info_new(void)
{
    struct _search_info *s;

    s = g_malloc0(sizeof(struct _search_info));
    s->strv = g_ptr_array_new();

    return s;
}

static void
search_info_set_flags(struct _search_info *si, unsigned int flags, unsigned int mask)
{
    si->flags = (si->flags & ~mask) | (flags & mask);
}

static void
search_info_set_colour(struct _search_info *si, const char *colour)
{
    g_free(si->colour);
    si->colour = g_strdup(colour);
}

static void
search_info_add_string(struct _search_info *si, const char *s)
{
    const unsigned char *start;
    guint32 c;

    if (s && s[0]) {
        const unsigned char *us = (unsigned char *) s;
        /* strip leading whitespace */
        start = us;
        while ((c = camel_utf8_getc (&us))) {
            if (!g_unichar_isspace (c)) {
                break;
            }
            start = us;
        }
        /* should probably also strip trailing, but i'm lazy today */
        if (start[0])
            g_ptr_array_add(si->strv, g_strdup ((char *)start));
    }
}

static void
search_info_clear(struct _search_info *si)
{
    int i;

    for (i=0;i<si->strv->len;i++)
        g_free(si->strv->pdata[i]);

    g_ptr_array_set_size(si->strv, 0);
}

static void
search_info_free(struct _search_info *si)
{
    int i;

    for (i=0;i<si->strv->len;i++)
        g_free(si->strv->pdata[i]);

    g_ptr_array_free(si->strv, TRUE);
    g_free(si->colour);
    g_free(si);
}

static struct _search_info *
search_info_clone(struct _search_info *si)
{
    struct _search_info *out;
    int i;

    out = search_info_new();
    for (i=0;i<si->strv->len;i++)
        g_ptr_array_add(out->strv, g_strdup(si->strv->pdata[i]));
    out->colour = g_strdup(si->colour);
    out->flags = si->flags;
    out->size = si->size;

    return out;
}

static struct _searcher *
search_info_to_searcher(struct _search_info *si)
{
    char *tags, *tage;
    char *col;

    if (si->strv->len == 0)
        return NULL;

    if (si->colour == NULL)
        col = "red";
    else
        col = si->colour;

    tags = alloca(20+strlen(col));
    sprintf(tags, "%c<font color=\"%s\">", TAG_ESCAPE, col);
    tage = alloca(20);
    sprintf(tage, "%c</font>", TAG_ESCAPE);

    return searcher_new (si->flags, si->strv->len, (unsigned char **)si->strv->pdata, tags, tage);
}

/* ********************************************************************** */

struct _ESearchingTokenizerPrivate {
    struct _search_info *primary, *secondary;
    struct _searcher *engine;
};

/** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/

static void
e_searching_tokenizer_finalise (GObject *obj)
{
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (obj);
    struct _ESearchingTokenizerPrivate *p = st->priv;

    search_info_free (p->primary);
    search_info_free (p->secondary);
    if (p->engine)
        searcher_free(p->engine);

    /* again wtf?
    shared_state_unref (st->priv->shared);
    */

    g_free (p);

    if (G_OBJECT_CLASS (parent_class)->finalize)
        G_OBJECT_CLASS (parent_class)->finalize(obj);
}

static void
e_searching_tokenizer_class_init (ESearchingTokenizerClass *klass)
{
    GObjectClass *obj_class = (GObjectClass *) klass;
    HTMLTokenizerClass *tok_class = HTML_TOKENIZER_CLASS (klass);

    parent_class = g_type_class_ref (HTML_TYPE_TOKENIZER);

    signals[MATCH_SIGNAL] =
        g_signal_new ("match",
                  E_TYPE_SEARCHING_TOKENIZER,
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ESearchingTokenizerClass, match),
                  NULL,
                  NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    obj_class->finalize = e_searching_tokenizer_finalise;

    tok_class->begin = e_searching_tokenizer_begin;
    tok_class->end = e_searching_tokenizer_end;

    tok_class->peek_token = e_searching_tokenizer_peek_token;
    tok_class->next_token = e_searching_tokenizer_next_token;
    tok_class->has_more = e_searching_tokenizer_has_more;
    tok_class->clone = e_searching_tokenizer_clone;
}

static void
e_searching_tokenizer_init (ESearchingTokenizer *st)
{
    struct _ESearchingTokenizerPrivate *p;

    p = st->priv = g_new0 (struct _ESearchingTokenizerPrivate, 1);

    p->primary = search_info_new();
    search_info_set_flags(p->primary, SEARCH_BOLD, SEARCH_CASE|SEARCH_BOLD);
    search_info_set_colour(p->primary, "red");

    p->secondary = search_info_new();
    search_info_set_flags(p->secondary, SEARCH_BOLD, SEARCH_CASE|SEARCH_BOLD);
    search_info_set_colour(p->secondary, "purple");
}

GType
e_searching_tokenizer_get_type (void)
{
    static GType type = 0;

    if (!type) {
        static const GTypeInfo info = {
            sizeof (ESearchingTokenizerClass),
            NULL, NULL,
            (GClassInitFunc) e_searching_tokenizer_class_init,
            NULL, NULL,
            sizeof (ESearchingTokenizer),
            0,
            (GInstanceInitFunc) e_searching_tokenizer_init,
        };

        type = g_type_register_static (HTML_TYPE_TOKENIZER, "ESearchingTokenizer", &info, 0);
    }

    return type;
}

HTMLTokenizer *
e_searching_tokenizer_new (void)
{
    return (HTMLTokenizer *) g_object_new (E_TYPE_SEARCHING_TOKENIZER, NULL);
}

/** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/

/* blah blah the htmltokeniser doesn't like being asked
   for a token if it doens't hvae any! */
static char *get_token(HTMLTokenizer *t)
{
    HTMLTokenizerClass *klass = HTML_TOKENIZER_CLASS (parent_class);

    return klass->has_more(t) ? klass->next_token(t) : NULL;
}

static void
e_searching_tokenizer_begin (HTMLTokenizer *t, char *content_type)
{
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (t);
    struct _ESearchingTokenizerPrivate *p = st->priv;

    /* reset search */
    if (p->engine) {
        searcher_free(p->engine);
        p->engine = NULL;
    }

    if ((p->engine = search_info_to_searcher(p->primary))
        || (p->engine = search_info_to_searcher(p->secondary))) {
        /*HTMLTokenizerClass *klass = HTML_TOKENIZER_CLASS (parent_class);*/

        /*searcher_set_tokenfunc(p->engine, klass->next_token, st);*/
        searcher_set_tokenfunc(p->engine, get_token, st);
    }
    /* else - no engine, no search active */

    HTML_TOKENIZER_CLASS (parent_class)->begin (t, content_type);
}

static void
e_searching_tokenizer_end (HTMLTokenizer *t)
{
    /* so end gets called before any get/next tokens.
       I dont get it.  */
#if 0
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (t);
    struct _ESearchingTokenizerPrivate *p = st->priv;

    /* not sure if we should reset search every time ... *shrug* */
    if (p->engine) {
        searcher_free(p->engine);
        p->engine = NULL;
    }
#endif

    HTML_TOKENIZER_CLASS (parent_class)->end (t);
}

static char *
e_searching_tokenizer_peek_token (HTMLTokenizer *tok)
{
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (tok);

    /* If no search is active, just use the default method. */
    if (st->priv->engine == NULL)
        return HTML_TOKENIZER_CLASS (parent_class)->peek_token (tok);

    return searcher_peek_token(st->priv->engine);
}

static char *
e_searching_tokenizer_next_token (HTMLTokenizer *tok)
{
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (tok);
    int oldmatched;
    char *token;

    /* If no search is active, just use the default method. */
    if (st->priv->engine == NULL)
        return HTML_TOKENIZER_CLASS (parent_class)->next_token (tok);

    oldmatched = st->priv->engine->matchcount;

    token = searcher_next_token(st->priv->engine);

    /* not sure if this has to be accurate or just say we had some matches */
    if (oldmatched != st->priv->engine->matchcount)
        g_signal_emit (st, signals[MATCH_SIGNAL], 0);

    return token;
}

static gboolean
e_searching_tokenizer_has_more (HTMLTokenizer *tok)
{
    ESearchingTokenizer *st = E_SEARCHING_TOKENIZER (tok);

    return (st->priv->engine != NULL && searcher_pending(st->priv->engine))
        || HTML_TOKENIZER_CLASS (parent_class)->has_more (tok);
}

/* proxy matched event, not sure what its for otherwise */
static void
matched (ESearchingTokenizer *st)
{
    /*++st->priv->match_count;*/
    g_signal_emit (st, signals[MATCH_SIGNAL], 0);
}

static HTMLTokenizer *
e_searching_tokenizer_clone (HTMLTokenizer *tok)
{
    ESearchingTokenizer *orig_st = E_SEARCHING_TOKENIZER (tok);
    ESearchingTokenizer *new_st = E_SEARCHING_TOKENIZER (e_searching_tokenizer_new ());

    search_info_free(new_st->priv->primary);
    search_info_free(new_st->priv->secondary);

    new_st->priv->primary = search_info_clone(orig_st->priv->primary);
    new_st->priv->secondary = search_info_clone(orig_st->priv->secondary);

    /* what the fucking what???? */
#if 0
    shared_state_ref (orig_st->priv->shared);
    shared_state_unref (new_st->priv->shared);
    new_st->priv->shared = orig_st->priv->shared;
#endif

    g_signal_connect_swapped (new_st, "match", G_CALLBACK(matched), orig_st);

    return HTML_TOKENIZER (new_st);
}
/* ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** */

void
e_searching_tokenizer_set_primary_search_string (ESearchingTokenizer *st, const gchar *search_str)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_clear(st->priv->primary);
    search_info_add_string(st->priv->primary, search_str);
}

void
e_searching_tokenizer_add_primary_search_string (ESearchingTokenizer *st, const gchar *search_str)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_add_string(st->priv->primary, search_str);
}

void
e_searching_tokenizer_set_primary_case_sensitivity (ESearchingTokenizer *st, gboolean iscase)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_set_flags(st->priv->primary, iscase?SEARCH_CASE:0, SEARCH_CASE);
}

void
e_searching_tokenizer_set_secondary_search_string (ESearchingTokenizer *st, const gchar *search_str)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_clear(st->priv->secondary);
    search_info_add_string(st->priv->secondary, search_str);
}

void
e_searching_tokenizer_add_secondary_search_string (ESearchingTokenizer *st, const gchar *search_str)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_add_string(st->priv->secondary, search_str);
}

void
e_searching_tokenizer_set_secondary_case_sensitivity (ESearchingTokenizer *st, gboolean iscase)
{
    g_return_if_fail (st && E_IS_SEARCHING_TOKENIZER (st));

    search_info_set_flags(st->priv->secondary, iscase?SEARCH_CASE:0, SEARCH_CASE);
}

/* Note: only returns the primary search string count */
gint
e_searching_tokenizer_match_count (ESearchingTokenizer *st)
{
    g_return_val_if_fail (E_IS_SEARCHING_TOKENIZER (st), -1);

    if (st->priv->engine && st->priv->primary->strv->len)
        return st->priv->engine->matchcount;

    return 0;
}


context:
space:
mode: