Annotation of libwww/Library/src/SGML.c, revision 1.15
1.1 timbl 1: /* General SGML Parser code SGML.c
2: ** ========================
3: **
1.2 timbl 4: ** This module implements an HTStream object. To parse an
1.1 timbl 5: ** SGML file, create this object which is a parser. The object
1.2 timbl 6: ** is (currently) created by being passed a DTD structure,
7: ** and a target HTStructured oject at which to throw the parsed stuff.
1.1 timbl 8: **
1.2 timbl 9: ** 6 Feb 93 Binary seraches used. Intreface modified.
1.1 timbl 10: */
11: #include "SGML.h"
12:
13: #include <ctype.h>
14: #include <stdio.h>
15: #include "HTUtils.h"
16: #include "HTChunk.h"
17: #include "tcp.h" /* For FROMASCII */
18:
1.2 timbl 19: #define INVALID (-1)
20:
1.1 timbl 21: /* The State (context) of the parser
22: **
1.2 timbl 23: ** This is passed with each call to make the parser reentrant
1.1 timbl 24: **
25: */
26:
1.2 timbl 27: #define MAX_ATTRIBUTES 20 /* Max number of attributes per element */
28:
29:
30: /* Element Stack
31: ** -------------
32: ** This allows us to return down the stack reselcting styles.
33: ** As we return, attribute values will be garbage in general.
34: */
35: typedef struct _HTElement HTElement;
36: struct _HTElement {
37: HTElement * next; /* Previously nested element or 0 */
38: HTTag* tag; /* The tag at this level */
39: };
40:
41:
42: /* Internal Context Data Structure
43: ** -------------------------------
44: */
45: struct _HTStream {
46:
47: CONST HTStreamClass * isa; /* inherited from HTStream */
48:
49: CONST SGML_dtd *dtd;
50: HTStructuredClass *actions; /* target class */
51: HTStructured *target; /* target object */
52:
1.1 timbl 53: HTTag *current_tag;
1.2 timbl 54: int current_attribute_number;
1.1 timbl 55: HTChunk *string;
56: HTElement *element_stack;
1.12 timbl 57: enum sgml_state { S_text, S_literal, S_tag, S_tag_gap,
1.1 timbl 58: S_attr, S_attr_gap, S_equals, S_value,
59: S_ero, S_cro,
1.13 timbl 60: #ifdef ISO_2022_JP
61: S_esc, S_dollar, S_paren, S_nonascii_text,
62: #endif
1.1 timbl 63: S_squoted, S_dquoted, S_end, S_entity, S_junk_tag} state;
1.2 timbl 64: #ifdef CALLERDATA
1.1 timbl 65: void * callerData;
1.2 timbl 66: #endif
67: BOOL present[MAX_ATTRIBUTES]; /* Flags: attribute is present? */
68: char * value[MAX_ATTRIBUTES]; /* malloc'd strings or NULL if none */
69: } ;
70:
71:
72: #define PUTC(ch) ((*context->actions->put_character)(context->target, ch))
73:
1.1 timbl 74:
75:
76: /* Handle Attribute
77: ** ----------------
78: */
79: /* PUBLIC CONST char * SGML_default = ""; ?? */
80:
81: #ifdef __STDC__
1.2 timbl 82: PRIVATE void handle_attribute_name(HTStream * context, const char * s)
1.1 timbl 83: #else
84: PRIVATE void handle_attribute_name(context, s)
1.2 timbl 85: HTStream * context;
1.1 timbl 86: char *s;
87: #endif
88: {
1.2 timbl 89:
90: HTTag * tag = context->current_tag;
91: attr* attributes = tag->attributes;
92:
93: int high, low, i, diff; /* Binary search for attribute name */
94: for(low=0, high=tag->number_of_attributes;
95: high > low ;
96: diff < 0 ? (low = i+1) : (high = i) ) {
97: i = (low + (high-low)/2);
98: diff = strcasecomp(attributes[i].name, s);
99: if (diff==0) { /* success: found it */
100: context->current_attribute_number = i;
101: context->present[i] = YES;
102: if (context->value[i]) {
103: free(context->value[i]);
104: context->value[i] = NULL;
105: }
106: return;
107: } /* if */
108:
109: } /* for */
110:
111: if (TRACE)
112: fprintf(stderr, "SGML: Unknown attribute %s for tag %s\n",
113: s, context->current_tag->name);
114: context->current_attribute_number = INVALID; /* Invalid */
1.1 timbl 115: }
116:
117:
118: /* Handle attribute value
119: ** ----------------------
120: */
121: #ifdef __STDC__
1.2 timbl 122: PRIVATE void handle_attribute_value(HTStream * context, const char * s)
1.1 timbl 123: #else
124: PRIVATE void handle_attribute_value(context, s)
1.2 timbl 125: HTStream * context;
1.1 timbl 126: char *s;
127: #endif
128: {
1.2 timbl 129: if (context->current_attribute_number != INVALID) {
130: StrAllocCopy(context->value[context->current_attribute_number], s);
1.1 timbl 131: } else {
132: if (TRACE) fprintf(stderr, "SGML: Attribute value %s ignored\n", s);
133: }
1.2 timbl 134: context->current_attribute_number = INVALID; /* can't have two assignments! */
1.1 timbl 135: }
136:
1.2 timbl 137:
1.1 timbl 138: /* Handle entity
139: ** -------------
140: **
141: ** On entry,
142: ** s contains the entity name zero terminated
143: ** Bugs:
144: ** If the entity name is unknown, the terminator is treated as
145: ** a printable non-special character in all cases, even if it is '<'
146: */
147: #ifdef __STDC__
1.2 timbl 148: PRIVATE void handle_entity(HTStream * context, char term)
1.1 timbl 149: #else
150: PRIVATE void handle_entity(context, term)
1.2 timbl 151: HTStream * context;
1.1 timbl 152: char term;
153: #endif
154: {
1.2 timbl 155:
1.3 timbl 156: CONST char ** entities = context->dtd->entity_names;
1.1 timbl 157: CONST char *s = context->string->data;
1.2 timbl 158:
159: int high, low, i, diff;
160: for(low=0, high = context->dtd->number_of_entities;
161: high > low ;
162: diff < 0 ? (low = i+1) : (high = i)) { /* Binary serach */
163: i = (low + (high-low)/2);
164: diff = strcmp(entities[i], s); /* Csse sensitive! */
165: if (diff==0) { /* success: found it */
166: (*context->actions->put_entity)(context->target, i);
167: return;
1.1 timbl 168: }
169: }
170: /* If entity string not found, display as text */
171: if (TRACE)
172: fprintf(stderr, "SGML: Unknown entity %s\n", s);
1.2 timbl 173: PUTC('&');
1.1 timbl 174: {
175: CONST char *p;
176: for (p=s; *p; p++) {
1.2 timbl 177: PUTC(*p);
1.1 timbl 178: }
179: }
1.2 timbl 180: PUTC(term);
1.1 timbl 181: }
182:
1.2 timbl 183:
1.1 timbl 184: /* End element
1.2 timbl 185: ** -----------
1.1 timbl 186: */
187: #ifdef __STDC__
1.2 timbl 188: PRIVATE void end_element(HTStream * context, HTTag * old_tag)
1.1 timbl 189: #else
190: PRIVATE void end_element(context, old_tag)
191: HTTag * old_tag;
1.2 timbl 192: HTStream * context;
1.1 timbl 193: #endif
194: {
195: if (TRACE) fprintf(stderr, "SGML: End </%s>\n", old_tag->name);
1.2 timbl 196: if (old_tag->contents == SGML_EMPTY) {
1.1 timbl 197: if (TRACE) fprintf(stderr,"SGML: Illegal end tag </%s> found.\n",
198: old_tag->name);
199: return;
200: }
201: while (context->element_stack) {/* Loop is error path only */
202: HTElement * N = context->element_stack;
203: HTTag * t = N->tag;
204:
205: if (old_tag != t) { /* Mismatch: syntax error */
206: if (context->element_stack->next) { /* This is not the last level */
207: if (TRACE) fprintf(stderr,
208: "SGML: Found </%s> when expecting </%s>. </%s> assumed.\n",
209: old_tag->name, t->name, t->name);
210: } else { /* last level */
211: if (TRACE) fprintf(stderr,
212: "SGML: Found </%s> when expecting </%s>. </%s> Ignored.\n",
213: old_tag->name, t->name, old_tag->name);
214: return; /* Ignore */
215: }
216: }
217:
218: context->element_stack = N->next; /* Remove from stack */
219: free(N);
1.2 timbl 220: (*context->actions->end_element)(context->target,
221: t - context->dtd->tags);
1.1 timbl 222: if (old_tag == t) return; /* Correct sequence */
223:
224: /* Syntax error path only */
225:
226: }
1.5 timbl 227: if (TRACE) fprintf(stderr,
1.1 timbl 228: "SGML: Extra end tag </%s> found and ignored.\n", old_tag->name);
229: }
230:
231:
232: /* Start a element
233: */
234: #ifdef __STDC__
1.2 timbl 235: PRIVATE void start_element(HTStream * context)
1.1 timbl 236: #else
237: PRIVATE void start_element(context)
1.2 timbl 238: HTStream * context;
1.1 timbl 239: #endif
240: {
241: HTTag * new_tag = context->current_tag;
242:
243: if (TRACE) fprintf(stderr, "SGML: Start <%s>\n", new_tag->name);
1.2 timbl 244: (*context->actions->start_element)(
245: context->target,
246: new_tag - context->dtd->tags,
247: context->present,
1.3 timbl 248: (CONST char**) context->value); /* coerce type for think c */
1.2 timbl 249: if (new_tag->contents != SGML_EMPTY) { /* i.e. tag not empty */
1.1 timbl 250: HTElement * N = (HTElement *)malloc(sizeof(HTElement));
251: if (N == NULL) outofmem(__FILE__, "start_element");
252: N->next = context->element_stack;
253: N->tag = new_tag;
254: context->element_stack = N;
255: }
256: }
257:
258:
1.2 timbl 259: /* Find Tag in DTD tag list
260: ** ------------------------
1.1 timbl 261: **
262: ** On entry,
1.2 timbl 263: ** dtd points to dtd structire including valid tag list
264: ** string points to name of tag in question
1.1 timbl 265: **
1.2 timbl 266: ** On exit,
267: ** returns:
1.7 timbl 268: ** NULL tag not found
269: ** else address of tag structure in dtd
1.2 timbl 270: */
1.11 timbl 271: PUBLIC HTTag * SGMLFindTag ARGS2(CONST SGML_dtd*, dtd, CONST char *, string)
1.2 timbl 272: {
273: int high, low, i, diff;
274: for(low=0, high=dtd->number_of_tags;
275: high > low ;
276: diff < 0 ? (low = i+1) : (high = i)) { /* Binary serach */
277: i = (low + (high-low)/2);
1.3 timbl 278: diff = strcasecomp(dtd->tags[i].name, string); /* Case insensitive */
1.2 timbl 279: if (diff==0) { /* success: found it */
1.7 timbl 280: return &dtd->tags[i];
1.2 timbl 281: }
282: }
1.7 timbl 283: return NULL;
1.2 timbl 284: }
285:
286: /*________________________________________________________________________
287: ** Public Methods
1.1 timbl 288: */
289:
1.2 timbl 290:
291: /* Could check that we are back to bottom of stack! @@ */
1.1 timbl 292:
1.8 timbl 293: PUBLIC void SGML_free ARGS1(HTStream *, context)
294: {
1.14 frystyk 295: int cnt;
296:
1.15 ! frystyk 297: while (context->element_stack) { /* Make sure, that all tags are gone */
! 298: HTElement *ptr = context->element_stack;
! 299:
! 300: if(TRACE) fprintf(stderr, "SGML: Non-matched tag found: <%s>\n",
! 301: context->element_stack->tag->name);
! 302: context->element_stack = ptr->next;
! 303: free(ptr);
! 304: }
1.8 timbl 305: (*context->actions->free)(context->target);
306: HTChunkFree(context->string);
1.15 ! frystyk 307: for(cnt=0; cnt<MAX_ATTRIBUTES; cnt++) /* Leak fix Henrik 18/02-94 */
1.14 frystyk 308: if(context->value[cnt])
309: free(context->value[cnt]);
1.8 timbl 310: free(context);
1.1 timbl 311: }
312:
1.8 timbl 313: PUBLIC void SGML_abort ARGS2(HTStream *, context, HTError, e)
1.1 timbl 314: {
1.14 frystyk 315: int cnt;
316:
1.15 ! frystyk 317: while (context->element_stack) { /* Make sure, that all tags are gone */
! 318: HTElement *ptr = context->element_stack;
! 319:
! 320: if(TRACE) fprintf(stderr, "SGML: Non-matched tag found: <%s>\n",
! 321: context->element_stack->tag->name);
! 322: context->element_stack = ptr->next;
! 323: free(ptr);
! 324: }
1.8 timbl 325: (*context->actions->abort)(context->target, e);
1.1 timbl 326: HTChunkFree(context->string);
1.14 frystyk 327: for(cnt=0; cnt<MAX_ATTRIBUTES; cnt++) /* Leak fix Henrik 18/02-94 */
328: if(context->value[cnt])
329: free(context->value[cnt]);
1.1 timbl 330: free(context);
331: }
332:
1.2 timbl 333:
1.1 timbl 334: /* Read and write user callback handle
335: ** -----------------------------------
336: **
337: ** The callbacks from the SGML parser have an SGML context parameter.
338: ** These calls allow the caller to associate his own context with a
339: ** particular SGML context.
340: */
341:
1.2 timbl 342: #ifdef CALLERDATA
343: PUBLIC void* SGML_callerData ARGS1(HTStream *, context)
1.1 timbl 344: {
345: return context->callerData;
346: }
347:
1.2 timbl 348: PUBLIC void SGML_setCallerData ARGS2(HTStream *, context, void*, data)
1.1 timbl 349: {
350: context->callerData = data;
351: }
1.2 timbl 352: #endif
1.1 timbl 353:
1.2 timbl 354: PUBLIC void SGML_character ARGS2(HTStream *, context, char,c)
1.1 timbl 355:
356: {
1.2 timbl 357: CONST SGML_dtd *dtd = context->dtd;
1.1 timbl 358: HTChunk *string = context->string;
359:
360: switch(context->state) {
361: case S_text:
1.13 timbl 362: #ifdef ISO_2022_JP
363: if (c=='\033') {
364: context->state = S_esc;
365: PUTC(c);
366: break;
367: }
368: #endif /* ISO_2022_JP */
1.6 timbl 369: if (c=='&' && (!context->element_stack || (
370: context->element_stack->tag &&
371: ( context->element_stack->tag->contents == SGML_MIXED
372: || context->element_stack->tag->contents ==
373: SGML_RCDATA)
374: ))) {
1.1 timbl 375: string->size = 0;
376: context->state = S_ero;
377:
378: } else if (c=='<') {
379: string->size = 0;
380: context->state = (context->element_stack &&
1.13 timbl 381: context->element_stack->tag &&
382: context->element_stack->tag->contents == SGML_LITERAL) ?
1.12 timbl 383: S_literal : S_tag;
1.2 timbl 384: } else PUTC(c);
1.1 timbl 385: break;
1.13 timbl 386:
387: #ifdef ISO_2022_JP
388: case S_esc:
389: if (c=='$') {
390: context->state = S_dollar;
391: } else if (c=='(') {
392: context->state = S_paren;
393: } else {
394: context->state = S_text;
395: }
396: PUTC(c);
397: break;
398: case S_dollar:
399: if (c=='@' || c=='B') {
400: context->state = S_nonascii_text;
401: } else {
402: context->state = S_text;
403: }
404: PUTC(c);
405: break;
406: case S_paren:
407: if (c=='B' || c=='J') {
408: context->state = S_text;
409: } else {
410: context->state = S_text;
411: }
412: PUTC(c);
413: break;
414: case S_nonascii_text:
415: if (c=='\033') {
416: context->state = S_esc;
417: PUTC(c);
418: } else {
419: PUTC(c);
420: }
421: break;
422: #endif /* ISO_2022_JP */
1.1 timbl 423:
1.12 timbl 424: /* In literal mode, waits only for specific end tag!
1.2 timbl 425: ** Only foir compatibility with old servers.
1.1 timbl 426: */
1.12 timbl 427: case S_literal :
1.1 timbl 428: HTChunkPutc(string, c);
429: if ( TOUPPER(c) != ((string->size ==1) ? '/'
430: : context->element_stack->tag->name[string->size-2])) {
431: int i;
432:
1.12 timbl 433: /* If complete match, end literal */
1.1 timbl 434: if ((c=='>') && (!context->element_stack->tag->name[string->size-2])) {
435: end_element(context, context->element_stack->tag);
436: string->size = 0;
1.2 timbl 437: context->current_attribute_number = INVALID;
1.1 timbl 438: context->state = S_text;
439: break;
440: } /* If Mismatch: recover string. */
1.2 timbl 441: PUTC( '<');
1.1 timbl 442: for (i=0; i<string->size; i++) /* recover */
1.2 timbl 443: PUTC(
1.1 timbl 444: string->data[i]);
445: context->state = S_text;
446: }
447:
448: break;
449:
450: /* Character reference or Entity
451: */
452: case S_ero:
453: if (c=='#') {
454: context->state = S_cro; /* &# is Char Ref Open */
455: break;
456: }
457: context->state = S_entity; /* Fall through! */
458:
459: /* Handle Entities
460: */
461: case S_entity:
462: if (isalnum(c))
463: HTChunkPutc(string, c);
464: else {
465: HTChunkTerminate(string);
466: handle_entity(context, c);
467: context->state = S_text;
468: }
469: break;
470:
471: /* Character reference
472: */
473: case S_cro:
474: if (isalnum(c))
475: HTChunkPutc(string, c); /* accumulate a character NUMBER */
476: else {
477: int value;
478: HTChunkTerminate(string);
479: if (sscanf(string->data, "%d", &value)==1)
1.2 timbl 480: PUTC(FROMASCII((char)value));
1.1 timbl 481: context->state = S_text;
482: }
483: break;
484:
485: /* Tag
486: */
487: case S_tag: /* new tag */
488: if (isalnum(c))
489: HTChunkPutc(string, c);
490: else { /* End of tag name */
1.7 timbl 491: HTTag * t;
1.1 timbl 492: if (c=='/') {
493: if (TRACE) if (string->size!=0)
494: fprintf(stderr,"SGML: `<%s/' found!\n", string->data);
495: context->state = S_end;
496: break;
497: }
498: HTChunkTerminate(string) ;
1.2 timbl 499:
1.10 timbl 500: t = SGMLFindTag(dtd, string->data);
1.7 timbl 501: if (!t) {
1.2 timbl 502: if(TRACE) fprintf(stderr, "SGML: *** Unknown element %s\n",
1.1 timbl 503: string->data);
504: context->state = (c=='>') ? S_text : S_junk_tag;
505: break;
506: }
1.7 timbl 507: context->current_tag = t;
1.2 timbl 508:
509: /* Clear out attributes
510: */
1.1 timbl 511:
1.2 timbl 512: {
513: int i;
514: for (i=0; i< context->current_tag->number_of_attributes; i++)
515: context->present[i] = NO;
1.1 timbl 516: }
517: string->size = 0;
1.2 timbl 518: context->current_attribute_number = INVALID;
1.1 timbl 519:
520: if (c=='>') {
521: if (context->current_tag->name) start_element(context);
522: context->state = S_text;
523: } else {
524: context->state = S_tag_gap;
525: }
526: }
527: break;
528:
529:
530: case S_tag_gap: /* Expecting attribute or > */
531: if (WHITE(c)) break; /* Gap between attributes */
532: if (c=='>') { /* End of tag */
533: if (context->current_tag->name) start_element(context);
534: context->state = S_text;
535: break;
536: }
537: HTChunkPutc(string, c);
538: context->state = S_attr; /* Get attribute */
539: break;
540:
541: /* accumulating value */
542: case S_attr:
543: if (WHITE(c) || (c=='>') || (c=='=')) { /* End of word */
544: HTChunkTerminate(string) ;
545: handle_attribute_name(context, string->data);
546: string->size = 0;
547: if (c=='>') { /* End of tag */
548: if (context->current_tag->name) start_element(context);
549: context->state = S_text;
550: break;
551: }
552: context->state = (c=='=' ? S_equals: S_attr_gap);
553: } else {
554: HTChunkPutc(string, c);
555: }
556: break;
557:
558: case S_attr_gap: /* Expecting attribute or = or > */
559: if (WHITE(c)) break; /* Gap after attribute */
560: if (c=='>') { /* End of tag */
561: if (context->current_tag->name) start_element(context);
562: context->state = S_text;
563: break;
564: } else if (c=='=') {
565: context->state = S_equals;
566: break;
567: }
568: HTChunkPutc(string, c);
569: context->state = S_attr; /* Get next attribute */
570: break;
571:
572: case S_equals: /* After attr = */
573: if (WHITE(c)) break; /* Before attribute value */
574: if (c=='>') { /* End of tag */
1.5 timbl 575: if (TRACE) fprintf(stderr, "SGML: found = but no value\n");
1.1 timbl 576: if (context->current_tag->name) start_element(context);
577: context->state = S_text;
578: break;
579:
580: } else if (c=='\'') {
581: context->state = S_squoted;
582: break;
583:
584: } else if (c=='"') {
585: context->state = S_dquoted;
586: break;
587: }
588: HTChunkPutc(string, c);
589: context->state = S_value;
590: break;
591:
592: case S_value:
593: if (WHITE(c) || (c=='>')) { /* End of word */
594: HTChunkTerminate(string) ;
595: handle_attribute_value(context, string->data);
596: string->size = 0;
597: if (c=='>') { /* End of tag */
598: if (context->current_tag->name) start_element(context);
599: context->state = S_text;
600: break;
601: }
602: else context->state = S_tag_gap;
603: } else {
604: HTChunkPutc(string, c);
605: }
606: break;
607:
608: case S_squoted: /* Quoted attribute value */
609: if (c=='\'') { /* End of attribute value */
610: HTChunkTerminate(string) ;
611: handle_attribute_value(context, string->data);
612: string->size = 0;
613: context->state = S_tag_gap;
614: } else {
615: HTChunkPutc(string, c);
616: }
617: break;
618:
619: case S_dquoted: /* Quoted attribute value */
620: if (c=='"') { /* End of attribute value */
621: HTChunkTerminate(string) ;
622: handle_attribute_value(context, string->data);
623: string->size = 0;
624: context->state = S_tag_gap;
625: } else {
626: HTChunkPutc(string, c);
627: }
628: break;
629:
630: case S_end: /* </ */
631: if (isalnum(c))
632: HTChunkPutc(string, c);
633: else { /* End of end tag name */
1.7 timbl 634: HTTag * t;
1.1 timbl 635: HTChunkTerminate(string) ;
1.7 timbl 636: if (!*string->data) { /* Empty end tag */
637: t = context->element_stack->tag;
638: } else {
1.10 timbl 639: t = SGMLFindTag(dtd, string->data);
1.1 timbl 640: }
1.7 timbl 641: if (!t) {
1.1 timbl 642: if(TRACE) fprintf(stderr,
643: "Unknown end tag </%s>\n", string->data);
1.2 timbl 644: } else {
1.7 timbl 645: context->current_tag = t;
1.2 timbl 646: end_element( context, context->current_tag);
1.1 timbl 647: }
1.2 timbl 648:
1.1 timbl 649: string->size = 0;
1.2 timbl 650: context->current_attribute_number = INVALID;
1.7 timbl 651: if (c!='>') {
652: if (TRACE && !WHITE(c))
653: fprintf(stderr,"SGML: `</%s%c' found!\n",
654: string->data, c);
655: context->state = S_junk_tag;
656: } else {
657: context->state = S_text;
658: }
1.1 timbl 659: }
660: break;
661:
662:
663: case S_junk_tag:
664: if (c=='>') {
665: context->state = S_text;
666: }
667:
668: } /* switch on context->state */
669:
670: } /* SGML_character */
1.2 timbl 671:
672:
673: PUBLIC void SGML_string ARGS2(HTStream *, context, CONST char*, str)
674: {
675: CONST char *p;
676: for(p=str; *p; p++)
677: SGML_character(context, *p);
678: }
679:
680:
681: PUBLIC void SGML_write ARGS3(HTStream *, context, CONST char*, str, int, l)
682: {
683: CONST char *p;
684: CONST char *e = str+l;
685: for(p=str; p<e; p++)
686: SGML_character(context, *p);
687: }
688:
689: /*_______________________________________________________________________
690: */
691:
692: /* Structured Object Class
693: ** -----------------------
694: */
695: PUBLIC CONST HTStreamClass SGMLParser =
696: {
697: "SGMLParser",
698: SGML_free,
1.8 timbl 699: SGML_abort,
1.9 timbl 700: SGML_character,
701: SGML_string,
702: SGML_write,
1.2 timbl 703: };
704:
705: /* Create SGML Engine
706: ** ------------------
707: **
708: ** On entry,
709: ** dtd represents the DTD, along with
710: ** actions is the sink for the data as a set of routines.
711: **
712: */
713:
714: PUBLIC HTStream* SGML_new ARGS2(
715: CONST SGML_dtd *, dtd,
716: HTStructured *, target)
717: {
718: int i;
719: HTStream* context = (HTStream *) malloc(sizeof(*context));
720: if (!context) outofmem(__FILE__, "SGML_begin");
721:
722: context->isa = &SGMLParser;
723: context->string = HTChunkCreate(128); /* Grow by this much */
724: context->dtd = dtd;
725: context->target = target;
726: context->actions = (HTStructuredClass*)(((HTStream*)target)->isa);
727: /* Ugh: no OO */
728: context->state = S_text;
729: context->element_stack = 0; /* empty */
730: #ifdef CALLERDATA
731: context->callerData = (void*) callerData;
732: #endif
733: for(i=0; i<MAX_ATTRIBUTES; i++) context->value[i] = 0;
734:
735: return context;
736: }
1.14 frystyk 737:
738:
739:
740:
741:
742:
743:
744:
745:
746:
747:
1.2 timbl 748:
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