Annotation of libwww/LineMode/src/GridText.c, revision 1.34
1.13 frystyk 1: /* GridText.c
2: ** CHARACTER GRID HYPERTEXT OBJECT
3: **
1.17 frystyk 4: ** (c) COPYRIGHT MIT 1995.
1.13 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
6: **
1.30 frystyk 7: ** This is the definition of the HyperDoc object and the HText interface
8: ** which is used in the current Library HTML parser
1.1 timbl 9: */
10:
1.16 frystyk 11: #include <assert.h>
12:
13: #include "WWWLib.h"
1.33 frystyk 14: #include "WWWCache.h"
15: #include "WWWRules.h"
1.19 frystyk 16: #include "HTBrowse.h"
1.16 frystyk 17: #include "HTFont.h"
18: #include "GridStyle.h"
19: #include "GridText.h"
1.1 timbl 20:
1.23 frystyk 21: #include "HTReqMan.h"
22:
1.11 howcome 23: /* HWL 18/7/94: applied patch from agl@glas2.glas.apc.org (Anton Tropashko) */
24: #ifdef CYRILLIC
25: #include "a_stdio.h"
26: #endif
27:
1.1 timbl 28: #define MAX_LINE HTScreenWidth /* No point in accumulating more */
1.16 frystyk 29: #define LOADED_LIMIT 6 /* For now, save last five texts */
1.1 timbl 30:
31: #ifdef CURSES
32: #define DISPLAY_LINES (HTScreenHeight)
33: #define TITLE_LINES 0
34: #else
1.19 frystyk 35: #define DISPLAY_LINES (HTScreenHeight - 2) /* Exclude prompt line */
1.1 timbl 36: #define TITLE_LINES 1
37: #endif
38:
1.19 frystyk 39: struct _HTStream { /* only know it as object */
40: CONST HTStreamClass * isa;
41: /* ... */
42: };
1.1 timbl 43:
44: /* From default style sheet:
45: */
46: extern HTStyleSheet * styleSheet; /* Default or overridden */
47:
48: /* Exports
49: */
50: PUBLIC HText * HTMainText = 0; /* Equivalent of main window */
51: PUBLIC HTParentAnchor * HTMainAnchor = 0; /* Anchor for HTMainText */
52:
53: typedef struct _line {
54: struct _line *next;
55: struct _line *prev;
56: short unsigned offset; /* Implicit initial spaces */
57: short unsigned size; /* Number of characters */
58: BOOL split_after; /* Can we split after? */
59: BOOL bullet; /* Do we bullet? */
60: char data[1]; /* Space for terminator at least! */
61: } HTLine;
62:
63: #define LINE_SIZE(l) (sizeof(HTLine)+(l)) /* allow for terminator */
64:
65: typedef struct _TextAnchor {
66: struct _TextAnchor * next;
67: int number; /* For user interface */
68: int start; /* Characters */
69: int extent; /* Characters */
70: HTChildAnchor * anchor;
71: } TextAnchor;
72:
73:
74: /* Notes on struct _Htext:
75: ** next_line is valid iff state is false.
76: ** top_of_screen line means the line at the top of the screen
77: ** or just under the title if there is one.
78: */
79: struct _HText {
80: HTParentAnchor * node_anchor;
81: char * title;
82: HTLine * last_line;
83: int lines; /* Number of them */
84: int chars; /* Number of them */
85: TextAnchor * first_anchor; /* Singly linked list */
86: TextAnchor * last_anchor;
87: int last_anchor_number; /* user number */
88: /* For Internal use: */
89: HTStyle * style; /* Current style */
90: int display_on_the_fly; /* Lines left */
1.3 timbl 91: BOOL all_pages; /* Loop on the fly */
1.1 timbl 92: int top_of_screen; /* Line number */
93: HTLine * top_of_screen_line; /* Top */
94: HTLine * next_line; /* Bottom + 1 */
95: int permissible_split; /* in last line */
96: BOOL in_line_1; /* of paragraph */
97: BOOL stale; /* Must refresh */
98:
99: HTStream* target; /* Output stream */
100: HTStreamClass targetClass; /* Output routines */
101: };
102:
103:
104: #define PUTC(c) (*text->targetClass.put_character)(text->target, c)
105: #define PUTS(s) (*text->targetClass.put_string)(text->target, s)
106:
107: /* Boring static variable used for moving cursor across
108: */
109:
110: #define SPACES(n) (&space_string[HTScreenWidth - (n)])
111: /* String containing blank spaces only */
112: PRIVATE char * space_string;
113:
114: PRIVATE HTStyle default_style =
115: { 0, "(Unstyled)", "",
116: (HTFont)0, 1.0, HT_BLACK, 0, 0,
117: 0, 0, 0, HT_LEFT, 1, 0, 0,
118: NO, NO, 0, 0, 0 };
119:
120:
1.29 frystyk 121: PUBLIC void clear_screen (void); /* Forward */
1.1 timbl 122:
123: PRIVATE HTList * loaded_texts; /* A list of all those in memory */
124:
125: /* Creation Method
126: ** ---------------
1.3 timbl 127: **
128: ** Interactive version
129: **
1.1 timbl 130: */
1.31 frystyk 131: PUBLIC HText * HText_new (HTRequest * request, HTParentAnchor * anchor)
1.1 timbl 132: {
133: HTLine * line;
1.34 ! frystyk 134: HText * self;
! 135: if ((self = (HText *) HT_MALLOC(sizeof(*self))) == NULL)
! 136: /* HT_OUTOFMEM("HText"); */
! 137: return self;
1.1 timbl 138:
139: if (!loaded_texts) loaded_texts = HTList_new();
140: HTList_addObject(loaded_texts, self);
141: if (HTList_count(loaded_texts) >= LOADED_LIMIT) {
1.20 frystyk 142: if (CACHE_TRACE)
1.26 frystyk 143: TTYPrint(TDEST, "MemoryCache. Freeing off cached doc.\n");
1.1 timbl 144: HText_free((HText *)HTList_removeFirstObject(loaded_texts));
145: }
146:
1.34 ! frystyk 147: if ((line = self->last_line = (HTLine *) HT_MALLOC(LINE_SIZE(MAX_LINE))) == NULL)
! 148: HT_OUTOFMEM("HText_New");
1.1 timbl 149: line->next = line->prev = line;
150: line->offset = line->size = 0;
151: self->lines = self->chars = 0;
152: self->title = 0;
153: self->first_anchor = self->last_anchor = 0;
154: self->style = &default_style;
155: self->top_of_screen = 0;
156: self->node_anchor = anchor;
157: self->last_anchor_number = 0; /* Numbering of them for references */
158: self->stale = YES;
159:
160: self->target = NULL;
161:
1.31 frystyk 162: HTAnchor_setDocument(anchor, (void *) self);
1.1 timbl 163:
164: clear_screen();
165: HTMainText = self;
166: HTMainAnchor = anchor;
167: self->display_on_the_fly = DISPLAY_LINES;
1.3 timbl 168: self->all_pages = NO; /* One page at a time on the fly */
1.1 timbl 169:
170: if (!space_string) { /* Make a blank line */
171: char *p;
1.34 ! frystyk 172: if ((space_string = (char *) HT_MALLOC(HTScreenWidth+1)) == NULL)
! 173: HT_OUTOFMEM("HText_New");
1.1 timbl 174: for (p=space_string; p<space_string+HTScreenWidth; p++)
175: *p = ' '; /* Used for printfs later */
176: space_string[HTScreenWidth] = '\0';
177: }
178:
179: return self;
180: }
181:
182:
183: /* Creation Method 2
184: ** ---------------
185: **
1.4 timbl 186: ** Non-interative OR interactive if stream is NULL
1.1 timbl 187: ** Stream is assumed open and left open.
188: */
1.31 frystyk 189: PUBLIC HText * HText_new2 (HTRequest * request,
190: HTParentAnchor * anchor,
191: HTStream * stream)
1.1 timbl 192: {
1.31 frystyk 193: HText * me = HText_new(request, anchor);
1.1 timbl 194:
195: if (stream) {
1.3 timbl 196: me->target = stream;
197: me->targetClass = *stream->isa; /* copy action procedures */
1.4 timbl 198: me->all_pages = YES; /* Display whole file on the fly */
1.3 timbl 199: }
200: return me;
1.1 timbl 201: }
202:
1.31 frystyk 203: /* Free a data object
204: ** ------------------
205: ** Removes the data object from the anchor
1.1 timbl 206: */
1.29 frystyk 207: PUBLIC void hyperfree (HText * self)
1.1 timbl 208: {
209: while(YES) { /* Free off line array */
210: HTLine * l = self->last_line;
211: l->next->prev = l->prev;
212: l->prev->next = l->next; /* Unlink l */
213: self->last_line = l->prev;
1.34 ! frystyk 214: HT_FREE(l);
1.1 timbl 215: if (l == self->last_line) break; /* empty */
216: };
217:
218: while(self->first_anchor) { /* Free off anchor array */
219: TextAnchor * l = self->first_anchor;
220: self->first_anchor = l->next;
1.34 ! frystyk 221: HT_FREE(l);
1.1 timbl 222: }
1.34 ! frystyk 223: HT_FREE(self);
1.8 frystyk 224: if (self == HTMainText) /* Henrik 24/02-94 */
225: HTMainText = NULL;
1.18 frystyk 226: }
227:
228:
229: /* Free Entire Text
230: ** ----------------
231: */
1.29 frystyk 232: PUBLIC void HText_free (HText * self)
1.18 frystyk 233: {
1.31 frystyk 234: HTAnchor_setDocument(self->node_anchor, NULL);
1.18 frystyk 235: hyperfree(self);
1.1 timbl 236: }
237:
238:
239: /* Display Methods
240: ** ---------------
241: */
1.22 frystyk 242:
1.1 timbl 243: /* Clear the screen (on screen-mode systems)
244: ** ----------------
245: */
1.29 frystyk 246: PUBLIC void clear_screen (void)
1.1 timbl 247: {
1.25 frystyk 248: if (WWWTRACE)
1.22 frystyk 249: return; /* in trace mode, don't clear trace away */
1.1 timbl 250: #ifdef CURSES
251: if (w_text != NULL) {
1.22 frystyk 252: wmove(w_text,0,0);
253: wclear(w_text);
1.1 timbl 254: }
1.22 frystyk 255: #endif /* Not CURSES */
1.1 timbl 256: if (HTMainText) HTMainText->stale = YES;
257: }
258:
259:
260: /* Output a line
261: ** -------------
262: */
1.29 frystyk 263: PRIVATE void display_line (HText * text, HTLine * line)
1.1 timbl 264: {
265: #ifdef CURSES
266: int y, x;
267:
268: waddstr(w_text, SPACES(line->offset));
269: waddstr(w_text, line->data);
270: getyx(w_text, y, x);
271: if (y < DISPLAY_LINES-1) {
272: wmove(w_text, ++y, 0);
273: }
274: #else
275: if (!text->target)
1.11 howcome 276: {
277: #ifdef CYRILLIC
278: /* HWL 18/7/94: applied patch from agl@glas2.glas.apc.org (Anton Tropashko) */
279: a_print(SPACES(line->offset),H,stdout);
280: a_print(line->data,H,stdout);
281: fputc('\n',stdout);
282: #else
1.26 frystyk 283: TTYPrint(STDOUT, "%s%s\n", SPACES(line->offset), line->data);
1.11 howcome 284: #endif
285: }
1.1 timbl 286: else {
287: PUTS(SPACES(line->offset));
288: PUTS(line->data);
289: PUTC('\n');
290: }
291: #endif
292:
293: }
294:
295: /* Output the title line
296: ** ---------------------
297: */
1.29 frystyk 298: PRIVATE void display_title (HText * text)
1.1 timbl 299: {
300: CONST char * title = HTAnchor_title(text->node_anchor);
301: char percent[20], format[20];
302: if (text->lines > (DISPLAY_LINES-1)) {
303: #ifdef NOPE
304: sprintf(percent, " (p%d of %d)",
305: (text->top_of_screen/(DISPLAY_LINES-1)) + 1,
306: (text->lines-1)/(DISPLAY_LINES-1) + 1);
307: sprintf(percent, " (%d%%)",
308: 100*(text->top_of_screen+DISPLAY_LINES-1)/ /* Seen */
309: (text->lines)); /* Total */
310: #else
311: sprintf(percent, " (%d/%d)",
312: text->top_of_screen+DISPLAY_LINES-1, /* Seen */
313: text->lines); /* Total */
314: #endif
315: } else {
316: percent[0] = 0; /* Null string */
317: }
318:
319: sprintf(format, "%%%d.%ds%%s\n", /* Generate format string */
320: (int)(HTScreenWidth-strlen(percent)),
321: (int)(HTScreenWidth-strlen(percent)) );
322: #ifdef CURSES
323: mvwprintw(w_top, 0, 0, format, title, percent);
324: wrefresh(w_top);
325: #else
1.26 frystyk 326: if (!text->target) TTYPrint(STDOUT, format, title, percent);
1.1 timbl 327: else {
1.34 ! frystyk 328: char * line;
! 329: if ((line = (char *) HT_MALLOC(HTScreenWidth+10)) == NULL)
! 330: HT_OUTOFMEM("display_titile");
1.1 timbl 331: sprintf(line, format, title, percent);
332: PUTS(line);
1.34 ! frystyk 333: HT_FREE(line);
1.1 timbl 334: }
335: #endif
336: }
337:
338:
339: /* Fill the screen with blank after the file
340: ** --------------------------
341: */
1.29 frystyk 342: PRIVATE void fill_screen (HText * text, int n)
1.1 timbl 343: {
344: if (n<=0 || n>1000) return; /* Large value means no pagination */
345: if (text->target) return;
346: #ifdef CURSES
347: waddstr(w_text, end_mark);
348: wclrtobot(w_text);
349: wrefresh(w_text);
350: #else
351: #ifndef VIOLA
1.26 frystyk 352: if (!text->target) TTYPrint(STDOUT, "%s\n", end_mark);
1.1 timbl 353: else { PUTS(end_mark); PUTC('\n'); }
354: n--;
355:
356: for (; n; n--) {
1.26 frystyk 357: if (!text->target) TTYPrint(STDOUT, "\n");
1.1 timbl 358: else PUTC('\n');
359: }
360: #endif
361: #endif /* Not CURSES */
362: }
363:
364:
365: /* Output a page
366: ** -------------
367: */
1.29 frystyk 368: PRIVATE void display_page (HText * text, int line_number)
1.1 timbl 369: {
370: HTLine * line = text->last_line->prev;
371: int i;
372: CONST char * title = HTAnchor_title(text->node_anchor);
373: int lines_of_text = title ? (DISPLAY_LINES-TITLE_LINES) : DISPLAY_LINES;
374: int last_screen = text->lines - lines_of_text;
375:
376: /* Constrain the line number to be within the document
377: */
378: if (text->lines <= lines_of_text) line_number = 0;
379: else if (line_number>last_screen) line_number = last_screen;
380: else if (line_number < 0) line_number = 0;
381:
382: for(i=0, line = text->last_line->next; /* Find line */
383: i<line_number && (line!=text->last_line);
384: i++, line=line->next) /* Loop */ assert(line->next != NULL);
385:
386: while((line!=text->last_line) && (line->size==0)) { /* Skip blank lines */
387: assert(line->next != NULL);
388: line = line->next;
389: line_number ++;
390: }
391:
392: /* Can we just scroll to it?
393: */
394: #ifndef VM /* No scrolling */
395: if (!text->stale && (line_number>=text->top_of_screen) &&
396: (line_number < text->top_of_screen + DISPLAY_LINES)) { /* Yes */
397: lines_of_text = line_number - text->top_of_screen;
398: line = text->next_line;
399: text->top_of_screen = line_number;
400: #ifdef CURSES
401: scrollok(w_text, TRUE);
402: for (i = 0; i < lines_of_text; i++) {
403: scroll(w_text);
404: }
405: #endif
406: } else
407: #endif
408: {
409: clear_screen(); /* No */
410: text->top_of_screen = line_number;
411: if (title) display_title(text);
412: }
413:
414: /* Bug: when we scroll to a part slightly futher down a page which previously
415: fitted all on one screen including the [End], the code below will add an
416: extra [End] to the screen, giving a total of two, one underneath the other.
417: */
418:
419: /* print it
420: */
421: if (line) {
422: for(i=0;
423: (i< lines_of_text) && (line != text->last_line); i++) {
424: assert(line != NULL);
425: display_line(text, line);
426: line = line->next;
427: }
428: fill_screen(text, lines_of_text - i);
429: }
430:
431: text->next_line = line; /* Line after screen */
432: text->stale = NO; /* Display is up-to-date */
433: }
434:
435:
436: /* Object Building methods
437: ** -----------------------
438: **
439: ** These are used by a parser to build the text in an object
440: */
1.29 frystyk 441: PUBLIC void HText_beginAppend (HText * text)
1.1 timbl 442: {
443: text->permissible_split = 0;
444: text->in_line_1 = YES;
445: }
446:
447:
448: /* Add a new line of text
449: ** ----------------------
450: **
451: ** On entry,
452: **
453: ** split is zero for newline function, else number of characters
454: ** before split.
455: ** text->display_on_the_fly
456: ** may be set to indicate direct output of the finished line.
1.3 timbl 457: ** text->all_pages
458: ** if set indicates all pages are to be done on the fly.
1.1 timbl 459: ** On exit,
460: ** A new line has been made, justified according to the
461: ** current style. Text after the split (if split nonzero)
462: ** is taken over onto the next line.
463: **
464: ** If display_on_the_fly is set, then it is decremented and
465: ** the finished line is displayed.
466: */
467: #define new_line(text) split_line(text, 0)
468:
1.29 frystyk 469: PRIVATE void split_line (HText * text, int split)
1.1 timbl 470: {
471: HTStyle * style = text->style;
472: int spare;
1.14 frystyk 473: int indent = (int) (text->in_line_1 ? text->style->indent1st
474: : text->style->leftIndent);
1.7 frystyk 475:
1.1 timbl 476: /* Make new line
477: */
478: HTLine * previous = text->last_line;
1.34 ! frystyk 479: HTLine * line;
! 480: if ((line = (HTLine *) HT_MALLOC(LINE_SIZE(MAX_LINE))) == NULL)
! 481: HT_OUTOFMEM("split_line");
! 482:
1.1 timbl 483: text->lines++;
484:
485: previous->next->prev = line;
486: line->prev = previous;
487: line->next = previous->next;
488: previous->next = line;
489: text->last_line = line;
490: line->size = 0;
491: line->offset = 0;
492:
493: /* Split at required point
494: */
495: if (split) { /* Delete space at "split" splitting line */
496: char * p;
497: previous->data[previous->size] = 0;
498: for (p = &previous->data[split]; *p; p++)
499: if (*p != ' ') break;
500: strcpy(line->data, p);
501: line->size = strlen(line->data);
502: previous->size = split;
503: }
504:
505: /* Economise on space.
506: ** Not on the RS6000 due to a chaotic bug in realloc argument passing.
507: ** Same problem with Ultrix (4.2) : realloc() is not declared properly.
508: */
1.16 frystyk 509: #ifndef AIX
510: #ifndef ultrix
1.1 timbl 511: while ((previous->size > 0) &&
512: (previous->data[previous->size-1] == ' ')) /* Strip trailers */
513: previous->size--;
1.7 frystyk 514:
1.34 ! frystyk 515: if ((previous = (HTLine *) HT_REALLOC(previous, LINE_SIZE(previous->size))) == NULL)
! 516: HT_OUTOFMEM("split_line");
1.16 frystyk 517: #endif /* ultrix */
518: #endif /* AIX */
1.1 timbl 519:
520: previous->prev->next = previous; /* Link in new line */
521: previous->next->prev = previous; /* Could be same node of course */
522:
523: /* Terminate finished line for printing
524: */
525: previous->data[previous->size] = 0;
1.7 frystyk 526:
1.1 timbl 527: /* Align left, right or center
528: */
529:
1.14 frystyk 530: spare = (int) (HTScreenWidth - style->rightIndent + style->leftIndent -
531: previous->size); /* @@ first line indent */
1.1 timbl 532:
533: switch (style->alignment) {
534: case HT_CENTER :
535: previous->offset = previous->offset + indent + spare/2;
536: break;
537: case HT_RIGHT :
538: previous->offset = previous->offset + indent + spare;
539: break;
540: case HT_LEFT :
541: case HT_JUSTIFY : /* Not implemented */
542: default:
543: previous->offset = previous->offset + indent;
544: break;
545: } /* switch */
546:
547: text->chars = text->chars + previous->size + 1; /* 1 for the line */
548: text->in_line_1 = NO; /* unless caller sets it otherwise */
549:
550: /* If displaying as we go, output it:
551: */
552: if (text->display_on_the_fly) {
553: if (text->display_on_the_fly == DISPLAY_LINES) { /* First line */
554: if (previous->size == 0) {
555: text->top_of_screen++; /* Scroll white space off top */
556: return;
557: }
558: if (HTAnchor_title(text->node_anchor)) { /* Title exists */
559: display_title(text);
560: text->display_on_the_fly--;
561: }
562: }
563: display_line(text, previous);
564: text->display_on_the_fly--;
1.3 timbl 565:
566: /* Loop to top of next page? */
567: if (!text->display_on_the_fly && text->all_pages) {
568: PUTS("\f\n"); /* Form feed on its own line a la rfc1111 */
569: text->display_on_the_fly = DISPLAY_LINES;
570: }
1.1 timbl 571: }
572: } /* split_line */
573:
574:
575: /* Allow vertical blank space
576: ** --------------------------
577: */
1.29 frystyk 578: PRIVATE void blank_lines (HText * text, int newlines)
1.1 timbl 579: {
580: if (text->last_line->size == 0) { /* No text on current line */
581: HTLine * line = text->last_line->prev;
582: while ((line!=text->last_line) && (line->size == 0)) {
583: if (newlines==0) break;
584: newlines--; /* Don't bother: already blank */
585: line = line->prev;
586: }
587: } else {
588: newlines++; /* Need also to finish this line */
589: }
590:
591: for(;newlines;newlines--) {
592: new_line(text);
593: }
594: text->in_line_1 = YES;
595: }
596:
597:
598: /* New paragraph in current style
599: ** ------------------------------
600: ** See also: setStyle.
601: */
602:
1.29 frystyk 603: PUBLIC void HText_appendParagraph (HText * text)
1.1 timbl 604: {
1.14 frystyk 605: int after = (int) text->style->spaceAfter;
606: int before = (int) text->style->spaceBefore;
1.1 timbl 607: blank_lines(text, after>before ? after : before);
608: }
609:
610:
611: /* Set Style
612: ** ---------
613: **
614: ** Does not filter unnecessary style changes.
615: */
1.29 frystyk 616: PUBLIC void HText_setStyle (HText * text, HTStyle * style)
1.1 timbl 617: {
618: int after, before;
619:
620: if (!style) return; /* Safety */
1.14 frystyk 621: after = (int) text->style->spaceAfter;
622: before = (int) style->spaceBefore;
1.20 frystyk 623: if (SGML_TRACE)
1.26 frystyk 624: TTYPrint(TDEST, "HTML: Change to style %s\n", style->name);
1.1 timbl 625: blank_lines (text, after>before ? after : before);
626: text->style = style;
627: }
628:
629:
630: /* Append a character to the text object
631: ** -------------------------------------
632: */
1.29 frystyk 633: PUBLIC void HText_appendCharacter (HText * text, char ch)
1.1 timbl 634: {
635: HTLine * line = text->last_line;
636: HTStyle * style = text->style;
1.14 frystyk 637: int indent = (int)(text->in_line_1 ? style->indent1st : style->leftIndent);
1.1 timbl 638:
639: /* New Line
640: */
641: if (ch == '\n') {
642: new_line(text);
643: text->in_line_1 = YES; /* First line of new paragraph */
644: return;
645: }
646:
647: /* Tabs
648: */
649:
650: if (ch == '\t') {
651: HTTabStop * tab;
652: int target; /* Where to tab to */
653: int here = line->size + line->offset +indent;
654: if (style->tabs) { /* Use tab table */
655: for (tab = style->tabs;
656: tab->position <= here;
657: tab++)
658: if (!tab->position) {
659: new_line(text);
660: return;
661: }
1.14 frystyk 662: target = (int) tab->position;
1.1 timbl 663: } else if (text->in_line_1) { /* Use 2nd indent */
664: if (here >= style->leftIndent) {
665: new_line(text); /* wrap */
666: return;
667: } else {
1.14 frystyk 668: target = (int) style->leftIndent;
1.1 timbl 669: }
670: } else { /* Default tabs align with left indent mod 8 */
671: #ifdef DEFAULT_TABS_8
672: target = ((line->offset + line->size + 8) & (-8))
673: + style->leftIndent;
674: #else
675: new_line(text);
676: return;
677: #endif
678: }
679: if (target > HTScreenWidth - style->rightIndent) {
680: new_line(text);
681: return;
682: } else {
683: text->permissible_split = line->size; /* Can split here */
684: if (line->size == 0) line->offset = line->offset + target - here;
685: else for(; here<target; here++) {
686: line->data[line->size++] = ' '; /* Put character into line */
687: }
688: return;
689: }
690: /*NOTREACHED*/
691: } /* if tab */
692:
693:
694: if (ch==' ') {
695: text->permissible_split = line->size; /* Can split here */
696: }
697:
698: /* Check for end of line
699: */
700: if (indent + line->offset + line->size + style->rightIndent
701: >= HTScreenWidth) {
702: if (style->wordWrap) {
1.7 frystyk 703: if(text->permissible_split > line->size) /* HENRIK 21/02-94 */
704: text->permissible_split = line->size;
1.1 timbl 705: split_line(text, text->permissible_split);
706: if (ch==' ') return; /* Ignore space causing split */
707: } else new_line(text);
708: }
709:
710: /* Insert normal characters
711: */
712: if (ch == HT_NON_BREAK_SPACE) {
713: ch = ' ';
714: }
715: {
716: HTLine * line = text->last_line; /* May have changed */
717: HTFont font = style->font;
718: line->data[line->size++] = /* Put character into line */
719: font & HT_CAPITALS ? TOUPPER(ch) : ch;
720: if (font & HT_DOUBLE) /* Do again if doubled */
721: HText_appendCharacter(text, HT_NON_BREAK_SPACE);
722: /* NOT a permissible split */
723: }
724: }
725:
726: /* Anchor handling
727: ** ---------------
728: */
729: /* Start an anchor field
730: */
1.29 frystyk 731: PUBLIC void HText_beginAnchor (HText * text, HTChildAnchor * anc)
1.1 timbl 732: {
1.2 timbl 733: char marker[100];
1.34 ! frystyk 734: TextAnchor * a;
! 735: if ((a = (TextAnchor *) HT_MALLOC(sizeof(*a))) == NULL)
! 736: HT_OUTOFMEM("HText_beginAnchor");
1.1 timbl 737:
738: if (a == NULL) outofmem(__FILE__, "HText_beginAnchor");
739: a->start = text->chars + text->last_line->size;
740: a->extent = 0;
741: if (text->last_anchor) {
742: text->last_anchor->next = a;
743: } else {
744: text->first_anchor = a;
745: }
746: a->next = 0;
747: a->anchor = anc;
748: text->last_anchor = a;
749:
750: if (HTAnchor_followMainLink((HTAnchor*)anc)) {
751: a->number = ++(text->last_anchor_number);
752: } else {
753: a->number = 0;
754: }
1.2 timbl 755:
756: if (start_reference && a->number && display_anchors) {
757: /* If it goes somewhere */
758: sprintf(marker, start_reference, a->number);
759: HText_appendText(text, marker);
760: }
1.1 timbl 761: }
762:
763:
1.29 frystyk 764: PUBLIC void HText_endAnchor (HText * text)
1.1 timbl 765: {
766: TextAnchor * a = text->last_anchor;
767: char marker[100];
768: if (a->number && display_anchors) { /* If it goes somewhere */
1.2 timbl 769: sprintf(marker, end_reference, a->number);
1.1 timbl 770: HText_appendText(text, marker);
771: }
772: a->extent = text->chars + text->last_line->size - a->start;
773: }
774:
775:
1.5 timbl 776: /* IMAGES
777: */
1.29 frystyk 778: PUBLIC void HText_appendImage (
779: HText * text,
780: HTChildAnchor * anc,
781: CONST char * alt,
782: CONST char * alignment,
783: BOOL isMap)
1.5 timbl 784: {
1.9 frystyk 785: HText_appendText(text, alt? alt : "[IMAGE]");
1.5 timbl 786: }
787:
1.29 frystyk 788: PUBLIC void HText_appendText (HText * text, CONST char * str)
1.1 timbl 789: {
790: CONST char * p;
791: for(p=str; *p; p++) {
792: HText_appendCharacter(text, *p);
793: }
794: }
795:
796:
1.29 frystyk 797: PUBLIC void HText_endAppend (HText * text)
1.1 timbl 798: {
799: new_line(text);
800:
801: if (text->display_on_the_fly) { /* Not finished? */
802: fill_screen(text, text->display_on_the_fly); /* Finish it */
803: text->display_on_the_fly = 0;
804: text->next_line = text->last_line; /* Bug fix after EvA 920117 */
805: text->stale = NO;
806: }
807: }
808:
809:
810:
1.20 frystyk 811: /* Dump diagnostics to TDEST
1.1 timbl 812: */
1.29 frystyk 813: PUBLIC void HText_dump (HText * text)
1.1 timbl 814: {
1.26 frystyk 815: TTYPrint(TDEST, "HText: Dump called\n");
1.1 timbl 816: }
817:
818:
819: /* Return the anchor associated with this node
820: */
1.29 frystyk 821: PUBLIC HTParentAnchor * HText_nodeAnchor (HText * text)
1.1 timbl 822: {
823: return text->node_anchor;
824: }
825:
826: /* GridText specials
827: ** =================
828: */
829: /* Return the anchor with index N
830: **
831: ** The index corresponds to the number we print in the anchor.
832: */
1.29 frystyk 833: PUBLIC HTChildAnchor * HText_childNumber (HText * text, int number)
1.1 timbl 834: {
835: TextAnchor * a;
836: for (a = text->first_anchor; a; a = a->next) {
837: if (a->number == number) return a->anchor;
838: }
839: return (HTChildAnchor *)0; /* Fail */
840: }
841:
1.29 frystyk 842: PUBLIC void HText_setStale (HText * text)
1.1 timbl 843: {
1.16 frystyk 844: if (text)
845: text->stale = YES;
1.1 timbl 846: }
847:
1.29 frystyk 848: PUBLIC void HText_refresh (HText * text)
1.1 timbl 849: {
1.16 frystyk 850: if (text && text->stale)
851: display_page(text, text->top_of_screen);
1.1 timbl 852: }
853:
1.29 frystyk 854: PUBLIC int HText_sourceAnchors (HText * text)
1.1 timbl 855: {
1.16 frystyk 856: return (text ? text->last_anchor_number : -1);
1.1 timbl 857: }
858:
1.29 frystyk 859: PUBLIC BOOL HText_canScrollUp (HText * text)
1.1 timbl 860: {
1.16 frystyk 861: return (text && text->top_of_screen != 0);
1.1 timbl 862: }
863:
1.29 frystyk 864: PUBLIC BOOL HText_canScrollDown (HText * text)
1.1 timbl 865: {
1.16 frystyk 866: return (text && (text->top_of_screen + DISPLAY_LINES -
867: (text->title ? TITLE_LINES : 0)) < text->lines);
1.1 timbl 868: }
869:
870: /* Scroll actions
871: */
1.29 frystyk 872: PUBLIC void HText_scrollTop (HText * text)
1.1 timbl 873: {
874: display_page(text, 0);
875: }
876:
1.29 frystyk 877: PUBLIC void HText_scrollDown (HText * text)
1.1 timbl 878: {
879: display_page(text, text->top_of_screen + DISPLAY_LINES -1);
880: }
881:
1.29 frystyk 882: PUBLIC void HText_scrollUp (HText * text)
1.1 timbl 883: {
884: display_page(text, text->top_of_screen - DISPLAY_LINES +1);
885: }
886:
1.29 frystyk 887: PUBLIC void HText_scrollBottom (HText * text)
1.1 timbl 888: {
889: display_page(text, text->lines - DISPLAY_LINES +1);
890: }
891:
892:
893: /* Browsing functions
894: ** ==================
895: */
896:
897: /* Bring to front and highlight it
898: */
899:
1.29 frystyk 900: PRIVATE int line_for_char (HText * text, int char_num)
1.1 timbl 901: {
902: int line_number =0;
903: int characters = 0;
904: HTLine * line = text->last_line->next;
905: for(;;) {
906: if (line == text->last_line) return 0; /* Invalid */
907: characters = characters + line->size + 1;
908: if (characters > char_num) return line_number;
909: line_number ++;
910: line = line->next;
911: }
912: }
913:
1.29 frystyk 914: PUBLIC BOOL HText_select (HText * text)
1.1 timbl 915: {
1.13 frystyk 916: if (text) {
1.1 timbl 917: HTMainText = text;
918: HTMainAnchor = text->node_anchor;
919: display_page(text, text->top_of_screen);
1.13 frystyk 920: return YES;
1.1 timbl 921: }
1.20 frystyk 922: if (SGML_TRACE)
1.26 frystyk 923: TTYPrint(TDEST, "HText: Nothing to select!\n");
1.13 frystyk 924: return NO;
1.1 timbl 925: }
926:
1.29 frystyk 927: PUBLIC BOOL HText_selectAnchor (HText * text, HTChildAnchor * anchor)
1.1 timbl 928: {
929: TextAnchor * a;
930:
931: for(a=text->first_anchor; a; a=a->next) {
932: if (a->anchor == anchor) break;
933: }
934: if (!a) {
1.20 frystyk 935: if (SGML_TRACE)
1.26 frystyk 936: TTYPrint(TDEST, "HText: No such anchor in this text!\n");
1.1 timbl 937: return NO;
938: }
939:
940: if (text != HTMainText) { /* Comment out by ??? */
941: HTMainText = text; /* Put back in by tbl 921208 */
942: HTMainAnchor = text->node_anchor;
943: }
944:
945: {
1.20 frystyk 946: int l = line_for_char(text, a->start);
947: if (SGML_TRACE)
1.26 frystyk 948: TTYPrint(TDEST,"HText: Selecting anchor [%d] at char %d, line %d\n",
1.20 frystyk 949: a->number, a->start, l);
1.1 timbl 950:
951: if ( !text->stale &&
1.20 frystyk 952: (l >= text->top_of_screen) &&
953: ( l < text->top_of_screen + DISPLAY_LINES-1))
954: return YES;
1.1 timbl 955: display_page(text, l - (DISPLAY_LINES/3)); /* Scroll to it */
956: }
957: return YES;
958: }
959:
960:
961: /* Editing functions - NOT IMPLEMENTED
962: ** =================
963: **
964: ** These are called from the application. There are many more functions
965: ** not included here from the orginal text object.
966: */
967:
968: /* Style handling:
969: */
970: /* Apply this style to the selection
971: */
1.29 frystyk 972: PUBLIC void HText_applyStyle (HText * me, HTStyle * style)
1.1 timbl 973: {
974:
975: }
976:
977:
978: /* Update all text with changed style.
979: */
1.29 frystyk 980: PUBLIC void HText_updateStyle (HText * me, HTStyle * style)
1.1 timbl 981: {
982:
983: }
984:
985:
986: /* Return style of selection
987: */
1.29 frystyk 988: PUBLIC HTStyle * HText_selectionStyle (
989: HText * me,
990: HTStyleSheet * sheet)
1.1 timbl 991: {
992: return 0;
993: }
994:
995:
996: /* Paste in styled text
997: */
1.29 frystyk 998: PUBLIC void HText_replaceSel (
999: HText * me,
1000: CONST char * aString,
1001: HTStyle * aStyle)
1.1 timbl 1002: {
1003: }
1004:
1005:
1006: /* Apply this style to the selection and all similarly formatted text
1007: ** (style recovery only)
1008: */
1.29 frystyk 1009: PUBLIC void HTextApplyToSimilar (HText * me, HTStyle * style)
1.1 timbl 1010: {
1011:
1012: }
1013:
1014:
1015: /* Select the first unstyled run.
1016: ** (style recovery only)
1017: */
1.29 frystyk 1018: PUBLIC void HTextSelectUnstyled (HText * me, HTStyleSheet * sheet)
1.1 timbl 1019: {
1020:
1021: }
1022:
1023:
1024: /* Anchor handling:
1025: */
1.29 frystyk 1026: PUBLIC void HText_unlinkSelection (HText * me)
1.1 timbl 1027: {
1028:
1029: }
1030:
1.29 frystyk 1031: PUBLIC HTAnchor * HText_referenceSelected (HText * me)
1.1 timbl 1032: {
1033: return 0;
1034: }
1035:
1036:
1037: #ifdef CURSES
1.29 frystyk 1038: PUBLIC int HText_getTopOfScreen (HText * text)
1.1 timbl 1039: {
1040: return text->top_of_screen;
1041: }
1042:
1.29 frystyk 1043: PUBLIC int HText_getLines (HText * text)
1.1 timbl 1044: {
1045: return text->lines;
1046: }
1047: #endif
1.29 frystyk 1048: PUBLIC HTAnchor * HText_linkSelTo (HText * me, HTAnchor * anchor)
1.1 timbl 1049: {
1050: return 0;
1051: }
1052:
1.20 frystyk 1053: /*
1.24 frystyk 1054: ** Returns YES: keep header, NO: discard
1055: */
1056: PUBLIC BOOL HTHeaderParser (HTRequest *request, char *header)
1057: {
1058: if (STREAM_TRACE)
1.26 frystyk 1059: TTYPrint(TDEST, "MIMEExtra... we are now in callback\n");
1.24 frystyk 1060: return YES;
1061: }
1062:
1063: /*
1.20 frystyk 1064: ** Check if document is already loaded. As the application handles the
1065: ** memory cache, we call the application to ask. Also check if it has
1066: ** expired in which case we reload it (either from disk cache or remotely)
1067: */
1.24 frystyk 1068: PUBLIC int HTMemoryCache (HTRequest * request, HTExpiresMode mode,
1069: char * notification)
1.20 frystyk 1070: {
1.27 frystyk 1071: HTParentAnchor *anchor = HTRequest_anchor(request);
1.20 frystyk 1072: HText *text;
1073: if (!request)
1074: return HT_ERROR;
1.27 frystyk 1075: if ((text = (HText *) HTAnchor_document(anchor))) {
1076: if (HTRequest_reloadMode(request) != HT_MEM_REFRESH) {
1.20 frystyk 1077: if (CACHE_TRACE)
1.26 frystyk 1078: TTYPrint(TDEST,"HTMemCache.. Document already in memory\n");
1.20 frystyk 1079: if (mode != HT_EXPIRES_IGNORE) {
1.27 frystyk 1080: if (!HTCache_isValid(anchor)) {
1.29 frystyk 1081: if (mode == HT_EXPIRES_NOTIFY) {
1082: if (WWWTRACE) TTYPrint(TDEST, "%s\n", notification);
1083: } else {
1.20 frystyk 1084: if (CACHE_TRACE)
1.26 frystyk 1085: TTYPrint(TDEST,
1.20 frystyk 1086: "HTMemCache.. Expired - autoreload\n");
1.32 frystyk 1087: HTRequest_addRqHd(request, HT_C_IMS);
1.20 frystyk 1088: #ifndef HT_SHARED_DISK_CACHE
1.27 frystyk 1089: HTRequest_setReloadMode(request, HT_CACHE_REFRESH);
1.20 frystyk 1090: #endif
1091: return HT_ERROR; /* Must go get it */
1092: }
1093: }
1094: }
1.1 timbl 1095:
1.20 frystyk 1096: /*
1097: ** If we can use object then select it and return
1098: ** This should be a callback to the app mem cache handler
1099: */
1100: if (request->childAnchor)
1101: HText_selectAnchor(text, request->childAnchor);
1102: else
1103: HText_select(text);
1104: return HT_LOADED;
1105: } else { /* If refresh version in memory */
1.32 frystyk 1106: HTRequest_addRqHd(request, HT_C_IMS);
1.20 frystyk 1107: }
1108: } else { /* Don't reuse any old metainformation */
1.27 frystyk 1109: HTAnchor_clearHeader(anchor);
1.20 frystyk 1110: }
1111: return HT_ERROR;
1112: }
1.26 frystyk 1113:
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to GridText.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / LineMode / src