Annotation of libwww/LineMode/src/GridText.c, revision 1.38
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.
1.38 ! frystyk 6: ** @(#) $Id: Date Author State $
1.13 frystyk 7: **
1.30 frystyk 8: ** This is the definition of the HyperDoc object and the HText interface
9: ** which is used in the current Library HTML parser
1.1 timbl 10: */
11:
1.16 frystyk 12: #include <assert.h>
13:
14: #include "WWWLib.h"
1.33 frystyk 15: #include "WWWCache.h"
16: #include "WWWRules.h"
1.19 frystyk 17: #include "HTBrowse.h"
1.16 frystyk 18: #include "HTFont.h"
19: #include "GridStyle.h"
20: #include "GridText.h"
1.1 timbl 21:
1.23 frystyk 22: #include "HTReqMan.h"
23:
1.11 howcome 24: /* HWL 18/7/94: applied patch from agl@glas2.glas.apc.org (Anton Tropashko) */
25: #ifdef CYRILLIC
26: #include "a_stdio.h"
27: #endif
28:
1.1 timbl 29: #define MAX_LINE HTScreenWidth /* No point in accumulating more */
1.16 frystyk 30: #define LOADED_LIMIT 6 /* For now, save last five texts */
1.1 timbl 31:
32: #ifdef CURSES
33: #define DISPLAY_LINES (HTScreenHeight)
34: #define TITLE_LINES 0
35: #else
1.19 frystyk 36: #define DISPLAY_LINES (HTScreenHeight - 2) /* Exclude prompt line */
1.1 timbl 37: #define TITLE_LINES 1
38: #endif
39:
1.19 frystyk 40: struct _HTStream { /* only know it as object */
1.37 frystyk 41: const HTStreamClass * isa;
1.19 frystyk 42: /* ... */
43: };
1.1 timbl 44:
45: /* From default style sheet:
46: */
47: extern HTStyleSheet * styleSheet; /* Default or overridden */
48:
49: /* Exports
50: */
51: PUBLIC HText * HTMainText = 0; /* Equivalent of main window */
52: PUBLIC HTParentAnchor * HTMainAnchor = 0; /* Anchor for HTMainText */
53:
54: typedef struct _line {
55: struct _line *next;
56: struct _line *prev;
57: short unsigned offset; /* Implicit initial spaces */
58: short unsigned size; /* Number of characters */
59: BOOL split_after; /* Can we split after? */
60: BOOL bullet; /* Do we bullet? */
61: char data[1]; /* Space for terminator at least! */
62: } HTLine;
63:
64: #define LINE_SIZE(l) (sizeof(HTLine)+(l)) /* allow for terminator */
65:
66: typedef struct _TextAnchor {
67: struct _TextAnchor * next;
68: int number; /* For user interface */
69: int start; /* Characters */
70: int extent; /* Characters */
71: HTChildAnchor * anchor;
72: } TextAnchor;
73:
74:
75: /* Notes on struct _Htext:
76: ** next_line is valid iff state is false.
77: ** top_of_screen line means the line at the top of the screen
78: ** or just under the title if there is one.
79: */
80: struct _HText {
81: HTParentAnchor * node_anchor;
82: char * title;
83: HTLine * last_line;
84: int lines; /* Number of them */
85: int chars; /* Number of them */
86: TextAnchor * first_anchor; /* Singly linked list */
87: TextAnchor * last_anchor;
88: int last_anchor_number; /* user number */
89: /* For Internal use: */
90: HTStyle * style; /* Current style */
91: int display_on_the_fly; /* Lines left */
1.3 timbl 92: BOOL all_pages; /* Loop on the fly */
1.1 timbl 93: int top_of_screen; /* Line number */
94: HTLine * top_of_screen_line; /* Top */
95: HTLine * next_line; /* Bottom + 1 */
96: int permissible_split; /* in last line */
97: BOOL in_line_1; /* of paragraph */
98: BOOL stale; /* Must refresh */
99:
100: HTStream* target; /* Output stream */
101: HTStreamClass targetClass; /* Output routines */
1.36 eric 102: LineMode * pLm;
1.1 timbl 103: };
104:
105:
106: #define PUTC(c) (*text->targetClass.put_character)(text->target, c)
107: #define PUTS(s) (*text->targetClass.put_string)(text->target, s)
108:
109: /* Boring static variable used for moving cursor across
110: */
111:
112: #define SPACES(n) (&space_string[HTScreenWidth - (n)])
113: /* String containing blank spaces only */
114: PRIVATE char * space_string;
115:
116: PRIVATE HTStyle default_style =
117: { 0, "(Unstyled)", "",
118: (HTFont)0, 1.0, HT_BLACK, 0, 0,
119: 0, 0, 0, HT_LEFT, 1, 0, 0,
120: NO, NO, 0, 0, 0 };
121:
122:
1.29 frystyk 123: PUBLIC void clear_screen (void); /* Forward */
1.1 timbl 124:
125: PRIVATE HTList * loaded_texts; /* A list of all those in memory */
126:
127: /* Creation Method
128: ** ---------------
1.3 timbl 129: **
130: ** Interactive version
131: **
1.1 timbl 132: */
1.36 eric 133: extern LineMode * Context_getLineMode(HTRequest * request);
1.31 frystyk 134: PUBLIC HText * HText_new (HTRequest * request, HTParentAnchor * anchor)
1.1 timbl 135: {
136: HTLine * line;
1.34 frystyk 137: HText * self;
1.37 frystyk 138: if ((self = (HText *) HT_CALLOC(1, sizeof(*self))) == NULL)
1.34 frystyk 139: /* HT_OUTOFMEM("HText"); */
140: return self;
1.1 timbl 141:
1.36 eric 142: self->pLm = Context_getLineMode(request);
1.1 timbl 143: if (!loaded_texts) loaded_texts = HTList_new();
144: HTList_addObject(loaded_texts, self);
145: if (HTList_count(loaded_texts) >= LOADED_LIMIT) {
1.20 frystyk 146: if (CACHE_TRACE)
1.36 eric 147: HTTrace("MemoryCache. Freeing off cached doc.\n");
1.1 timbl 148: HText_free((HText *)HTList_removeFirstObject(loaded_texts));
149: }
150:
1.34 frystyk 151: if ((line = self->last_line = (HTLine *) HT_MALLOC(LINE_SIZE(MAX_LINE))) == NULL)
152: HT_OUTOFMEM("HText_New");
1.1 timbl 153: line->next = line->prev = line;
154: line->offset = line->size = 0;
155: self->lines = self->chars = 0;
156: self->title = 0;
157: self->first_anchor = self->last_anchor = 0;
158: self->style = &default_style;
159: self->top_of_screen = 0;
160: self->node_anchor = anchor;
161: self->last_anchor_number = 0; /* Numbering of them for references */
162: self->stale = YES;
163:
164: self->target = NULL;
165:
1.31 frystyk 166: HTAnchor_setDocument(anchor, (void *) self);
1.1 timbl 167:
168: clear_screen();
169: HTMainText = self;
170: HTMainAnchor = anchor;
171: self->display_on_the_fly = DISPLAY_LINES;
1.3 timbl 172: self->all_pages = NO; /* One page at a time on the fly */
1.1 timbl 173:
174: if (!space_string) { /* Make a blank line */
175: char *p;
1.34 frystyk 176: if ((space_string = (char *) HT_MALLOC(HTScreenWidth+1)) == NULL)
177: HT_OUTOFMEM("HText_New");
1.1 timbl 178: for (p=space_string; p<space_string+HTScreenWidth; p++)
179: *p = ' '; /* Used for printfs later */
180: space_string[HTScreenWidth] = '\0';
181: }
182:
183: return self;
184: }
185:
186:
187: /* Creation Method 2
188: ** ---------------
189: **
1.4 timbl 190: ** Non-interative OR interactive if stream is NULL
1.1 timbl 191: ** Stream is assumed open and left open.
192: */
1.31 frystyk 193: PUBLIC HText * HText_new2 (HTRequest * request,
194: HTParentAnchor * anchor,
195: HTStream * stream)
1.1 timbl 196: {
1.31 frystyk 197: HText * me = HText_new(request, anchor);
1.1 timbl 198:
199: if (stream) {
1.3 timbl 200: me->target = stream;
201: me->targetClass = *stream->isa; /* copy action procedures */
1.4 timbl 202: me->all_pages = YES; /* Display whole file on the fly */
1.3 timbl 203: }
204: return me;
1.1 timbl 205: }
206:
1.31 frystyk 207: /* Free a data object
208: ** ------------------
209: ** Removes the data object from the anchor
1.1 timbl 210: */
1.37 frystyk 211: PUBLIC void hyper_free (HText * self)
1.1 timbl 212: {
1.35 frystyk 213: if (self) {
214: while (1) { /* Free off line array */
215: HTLine * last = self->last_line;
216: if (last) {
217: last->next->prev = last->prev;
218: last->prev->next = last->next;
219: self->last_line = last->prev;
220: if (last == self->last_line) break;
221: HT_FREE(last);
222: }
223: break;
224: }
225: while (self->first_anchor) { /* Free off anchor array */
226: TextAnchor * last = self->first_anchor;
227: self->first_anchor = last->next;
228: HT_FREE(last);
229: }
230: if (self == HTMainText) HTMainText = NULL;
231: HT_FREE(self);
232: }
1.18 frystyk 233: }
234:
235:
236: /* Free Entire Text
237: ** ----------------
238: */
1.29 frystyk 239: PUBLIC void HText_free (HText * self)
1.18 frystyk 240: {
1.35 frystyk 241: if (self) {
242: HTAnchor_setDocument(self->node_anchor, NULL);
1.37 frystyk 243: hyper_free(self);
1.35 frystyk 244: }
1.1 timbl 245: }
246:
247:
248: /* Display Methods
249: ** ---------------
250: */
1.22 frystyk 251:
1.1 timbl 252: /* Clear the screen (on screen-mode systems)
253: ** ----------------
254: */
1.29 frystyk 255: PUBLIC void clear_screen (void)
1.1 timbl 256: {
1.25 frystyk 257: if (WWWTRACE)
1.22 frystyk 258: return; /* in trace mode, don't clear trace away */
1.1 timbl 259: #ifdef CURSES
260: if (w_text != NULL) {
1.22 frystyk 261: wmove(w_text,0,0);
262: wclear(w_text);
1.1 timbl 263: }
1.22 frystyk 264: #endif /* Not CURSES */
1.1 timbl 265: if (HTMainText) HTMainText->stale = YES;
266: }
267:
268:
269: /* Output a line
270: ** -------------
271: */
1.29 frystyk 272: PRIVATE void display_line (HText * text, HTLine * line)
1.1 timbl 273: {
274: #ifdef CURSES
275: int y, x;
276:
277: waddstr(w_text, SPACES(line->offset));
278: waddstr(w_text, line->data);
279: getyx(w_text, y, x);
280: if (y < DISPLAY_LINES-1) {
281: wmove(w_text, ++y, 0);
282: }
283: #else
284: if (!text->target)
1.11 howcome 285: {
286: #ifdef CYRILLIC
287: /* HWL 18/7/94: applied patch from agl@glas2.glas.apc.org (Anton Tropashko) */
288: a_print(SPACES(line->offset),H,stdout);
289: a_print(line->data,H,stdout);
290: fputc('\n',stdout);
291: #else
1.36 eric 292: OutputData(LineMode_getView(text->pLm), "%s%s\n", SPACES(line->offset), line->data);
1.11 howcome 293: #endif
294: }
1.1 timbl 295: else {
296: PUTS(SPACES(line->offset));
297: PUTS(line->data);
298: PUTC('\n');
299: }
300: #endif
301:
302: }
303:
304: /* Output the title line
305: ** ---------------------
306: */
1.29 frystyk 307: PRIVATE void display_title (HText * text)
1.1 timbl 308: {
1.37 frystyk 309: const char * title = HTAnchor_title(text->node_anchor);
1.1 timbl 310: char percent[20], format[20];
311: if (text->lines > (DISPLAY_LINES-1)) {
312: #ifdef NOPE
313: sprintf(percent, " (p%d of %d)",
314: (text->top_of_screen/(DISPLAY_LINES-1)) + 1,
315: (text->lines-1)/(DISPLAY_LINES-1) + 1);
316: sprintf(percent, " (%d%%)",
317: 100*(text->top_of_screen+DISPLAY_LINES-1)/ /* Seen */
318: (text->lines)); /* Total */
319: #else
320: sprintf(percent, " (%d/%d)",
321: text->top_of_screen+DISPLAY_LINES-1, /* Seen */
322: text->lines); /* Total */
323: #endif
324: } else {
325: percent[0] = 0; /* Null string */
326: }
327:
328: sprintf(format, "%%%d.%ds%%s\n", /* Generate format string */
329: (int)(HTScreenWidth-strlen(percent)),
330: (int)(HTScreenWidth-strlen(percent)) );
331: #ifdef CURSES
332: mvwprintw(w_top, 0, 0, format, title, percent);
333: wrefresh(w_top);
334: #else
1.36 eric 335: if (!text->target) OutputData(LineMode_getView(text->pLm), format, title, percent);
1.1 timbl 336: else {
1.34 frystyk 337: char * line;
338: if ((line = (char *) HT_MALLOC(HTScreenWidth+10)) == NULL)
339: HT_OUTOFMEM("display_titile");
1.1 timbl 340: sprintf(line, format, title, percent);
341: PUTS(line);
1.34 frystyk 342: HT_FREE(line);
1.1 timbl 343: }
344: #endif
345: }
346:
347:
348: /* Fill the screen with blank after the file
349: ** --------------------------
350: */
1.29 frystyk 351: PRIVATE void fill_screen (HText * text, int n)
1.1 timbl 352: {
353: if (n<=0 || n>1000) return; /* Large value means no pagination */
354: if (text->target) return;
355: #ifdef CURSES
356: waddstr(w_text, end_mark);
357: wclrtobot(w_text);
358: wrefresh(w_text);
359: #else
360: #ifndef VIOLA
1.36 eric 361: if (!text->target) OutputData(LineMode_getView(text->pLm), "%s\n", end_mark);
1.1 timbl 362: else { PUTS(end_mark); PUTC('\n'); }
363: n--;
364:
365: for (; n; n--) {
1.36 eric 366: if (!text->target) OutputData(LineMode_getView(text->pLm), "\n");
1.1 timbl 367: else PUTC('\n');
368: }
369: #endif
370: #endif /* Not CURSES */
371: }
372:
373:
374: /* Output a page
375: ** -------------
376: */
1.29 frystyk 377: PRIVATE void display_page (HText * text, int line_number)
1.1 timbl 378: {
379: HTLine * line = text->last_line->prev;
380: int i;
1.37 frystyk 381: const char * title = HTAnchor_title(text->node_anchor);
1.1 timbl 382: int lines_of_text = title ? (DISPLAY_LINES-TITLE_LINES) : DISPLAY_LINES;
383: int last_screen = text->lines - lines_of_text;
384:
385: /* Constrain the line number to be within the document
386: */
387: if (text->lines <= lines_of_text) line_number = 0;
388: else if (line_number>last_screen) line_number = last_screen;
389: else if (line_number < 0) line_number = 0;
390:
391: for(i=0, line = text->last_line->next; /* Find line */
392: i<line_number && (line!=text->last_line);
393: i++, line=line->next) /* Loop */ assert(line->next != NULL);
394:
395: while((line!=text->last_line) && (line->size==0)) { /* Skip blank lines */
396: assert(line->next != NULL);
397: line = line->next;
398: line_number ++;
399: }
400:
401: /* Can we just scroll to it?
402: */
403: #ifndef VM /* No scrolling */
404: if (!text->stale && (line_number>=text->top_of_screen) &&
405: (line_number < text->top_of_screen + DISPLAY_LINES)) { /* Yes */
406: lines_of_text = line_number - text->top_of_screen;
407: line = text->next_line;
408: text->top_of_screen = line_number;
409: #ifdef CURSES
410: scrollok(w_text, TRUE);
411: for (i = 0; i < lines_of_text; i++) {
412: scroll(w_text);
413: }
414: #endif
415: } else
416: #endif
417: {
418: clear_screen(); /* No */
419: text->top_of_screen = line_number;
420: if (title) display_title(text);
421: }
422:
423: /* Bug: when we scroll to a part slightly futher down a page which previously
424: fitted all on one screen including the [End], the code below will add an
425: extra [End] to the screen, giving a total of two, one underneath the other.
426: */
427:
428: /* print it
429: */
430: if (line) {
431: for(i=0;
432: (i< lines_of_text) && (line != text->last_line); i++) {
433: assert(line != NULL);
434: display_line(text, line);
435: line = line->next;
436: }
437: fill_screen(text, lines_of_text - i);
438: }
439:
440: text->next_line = line; /* Line after screen */
441: text->stale = NO; /* Display is up-to-date */
442: }
443:
444:
445: /* Object Building methods
446: ** -----------------------
447: **
448: ** These are used by a parser to build the text in an object
449: */
1.29 frystyk 450: PUBLIC void HText_beginAppend (HText * text)
1.1 timbl 451: {
452: text->permissible_split = 0;
453: text->in_line_1 = YES;
454: }
455:
456:
457: /* Add a new line of text
458: ** ----------------------
459: **
460: ** On entry,
461: **
462: ** split is zero for newline function, else number of characters
463: ** before split.
464: ** text->display_on_the_fly
465: ** may be set to indicate direct output of the finished line.
1.3 timbl 466: ** text->all_pages
467: ** if set indicates all pages are to be done on the fly.
1.1 timbl 468: ** On exit,
469: ** A new line has been made, justified according to the
470: ** current style. Text after the split (if split nonzero)
471: ** is taken over onto the next line.
472: **
473: ** If display_on_the_fly is set, then it is decremented and
474: ** the finished line is displayed.
475: */
476: #define new_line(text) split_line(text, 0)
477:
1.29 frystyk 478: PRIVATE void split_line (HText * text, int split)
1.1 timbl 479: {
480: HTStyle * style = text->style;
481: int spare;
1.14 frystyk 482: int indent = (int) (text->in_line_1 ? text->style->indent1st
483: : text->style->leftIndent);
1.7 frystyk 484:
1.1 timbl 485: /* Make new line
486: */
487: HTLine * previous = text->last_line;
1.34 frystyk 488: HTLine * line;
489: if ((line = (HTLine *) HT_MALLOC(LINE_SIZE(MAX_LINE))) == NULL)
490: HT_OUTOFMEM("split_line");
491:
1.1 timbl 492: text->lines++;
493:
494: previous->next->prev = line;
495: line->prev = previous;
496: line->next = previous->next;
497: previous->next = line;
498: text->last_line = line;
499: line->size = 0;
500: line->offset = 0;
501:
502: /* Split at required point
503: */
504: if (split) { /* Delete space at "split" splitting line */
505: char * p;
506: previous->data[previous->size] = 0;
507: for (p = &previous->data[split]; *p; p++)
508: if (*p != ' ') break;
509: strcpy(line->data, p);
510: line->size = strlen(line->data);
511: previous->size = split;
512: }
513:
514: while ((previous->size > 0) &&
1.37 frystyk 515: (previous->data[previous->size-1] == ' ')) /* Strip trailers */
1.1 timbl 516: previous->size--;
1.7 frystyk 517:
1.37 frystyk 518: if ((previous = (HTLine *) HT_REALLOC(previous,
519: LINE_SIZE(previous->size)))==NULL)
1.34 frystyk 520: HT_OUTOFMEM("split_line");
1.1 timbl 521:
522: previous->prev->next = previous; /* Link in new line */
523: previous->next->prev = previous; /* Could be same node of course */
524:
525: /* Terminate finished line for printing
526: */
527: previous->data[previous->size] = 0;
1.7 frystyk 528:
1.1 timbl 529: /* Align left, right or center
530: */
531:
1.14 frystyk 532: spare = (int) (HTScreenWidth - style->rightIndent + style->leftIndent -
533: previous->size); /* @@ first line indent */
1.1 timbl 534:
535: switch (style->alignment) {
536: case HT_CENTER :
537: previous->offset = previous->offset + indent + spare/2;
538: break;
539: case HT_RIGHT :
540: previous->offset = previous->offset + indent + spare;
541: break;
542: case HT_LEFT :
543: case HT_JUSTIFY : /* Not implemented */
544: default:
545: previous->offset = previous->offset + indent;
546: break;
547: } /* switch */
548:
549: text->chars = text->chars + previous->size + 1; /* 1 for the line */
550: text->in_line_1 = NO; /* unless caller sets it otherwise */
551:
552: /* If displaying as we go, output it:
553: */
554: if (text->display_on_the_fly) {
555: if (text->display_on_the_fly == DISPLAY_LINES) { /* First line */
556: if (previous->size == 0) {
557: text->top_of_screen++; /* Scroll white space off top */
558: return;
559: }
560: if (HTAnchor_title(text->node_anchor)) { /* Title exists */
561: display_title(text);
562: text->display_on_the_fly--;
563: }
564: }
565: display_line(text, previous);
566: text->display_on_the_fly--;
1.3 timbl 567:
568: /* Loop to top of next page? */
569: if (!text->display_on_the_fly && text->all_pages) {
570: PUTS("\f\n"); /* Form feed on its own line a la rfc1111 */
571: text->display_on_the_fly = DISPLAY_LINES;
572: }
1.1 timbl 573: }
574: } /* split_line */
575:
576:
577: /* Allow vertical blank space
578: ** --------------------------
579: */
1.29 frystyk 580: PRIVATE void blank_lines (HText * text, int newlines)
1.1 timbl 581: {
582: if (text->last_line->size == 0) { /* No text on current line */
583: HTLine * line = text->last_line->prev;
584: while ((line!=text->last_line) && (line->size == 0)) {
585: if (newlines==0) break;
586: newlines--; /* Don't bother: already blank */
587: line = line->prev;
588: }
589: } else {
590: newlines++; /* Need also to finish this line */
591: }
592:
593: for(;newlines;newlines--) {
594: new_line(text);
595: }
596: text->in_line_1 = YES;
597: }
598:
599:
600: /* New paragraph in current style
601: ** ------------------------------
602: ** See also: setStyle.
603: */
604:
1.29 frystyk 605: PUBLIC void HText_appendParagraph (HText * text)
1.1 timbl 606: {
1.14 frystyk 607: int after = (int) text->style->spaceAfter;
608: int before = (int) text->style->spaceBefore;
1.1 timbl 609: blank_lines(text, after>before ? after : before);
610: }
611:
612:
613: /* Set Style
614: ** ---------
615: **
616: ** Does not filter unnecessary style changes.
617: */
1.29 frystyk 618: PUBLIC void HText_setStyle (HText * text, HTStyle * style)
1.1 timbl 619: {
620: int after, before;
621:
622: if (!style) return; /* Safety */
1.14 frystyk 623: after = (int) text->style->spaceAfter;
624: before = (int) style->spaceBefore;
1.20 frystyk 625: if (SGML_TRACE)
1.36 eric 626: HTTrace("HTML: Change to style %s\n", style->name);
1.1 timbl 627: blank_lines (text, after>before ? after : before);
628: text->style = style;
629: }
630:
631:
632: /* Append a character to the text object
633: ** -------------------------------------
634: */
1.29 frystyk 635: PUBLIC void HText_appendCharacter (HText * text, char ch)
1.1 timbl 636: {
637: HTLine * line = text->last_line;
638: HTStyle * style = text->style;
1.14 frystyk 639: int indent = (int)(text->in_line_1 ? style->indent1st : style->leftIndent);
1.1 timbl 640:
641: /* New Line
642: */
643: if (ch == '\n') {
644: new_line(text);
645: text->in_line_1 = YES; /* First line of new paragraph */
646: return;
647: }
648:
649: /* Tabs
650: */
651:
652: if (ch == '\t') {
653: HTTabStop * tab;
654: int target; /* Where to tab to */
655: int here = line->size + line->offset +indent;
656: if (style->tabs) { /* Use tab table */
657: for (tab = style->tabs;
658: tab->position <= here;
659: tab++)
660: if (!tab->position) {
661: new_line(text);
662: return;
663: }
1.14 frystyk 664: target = (int) tab->position;
1.1 timbl 665: } else if (text->in_line_1) { /* Use 2nd indent */
666: if (here >= style->leftIndent) {
667: new_line(text); /* wrap */
668: return;
669: } else {
1.14 frystyk 670: target = (int) style->leftIndent;
1.1 timbl 671: }
672: } else { /* Default tabs align with left indent mod 8 */
673: #ifdef DEFAULT_TABS_8
674: target = ((line->offset + line->size + 8) & (-8))
675: + style->leftIndent;
676: #else
677: new_line(text);
678: return;
679: #endif
680: }
681: if (target > HTScreenWidth - style->rightIndent) {
682: new_line(text);
683: return;
684: } else {
685: text->permissible_split = line->size; /* Can split here */
686: if (line->size == 0) line->offset = line->offset + target - here;
687: else for(; here<target; here++) {
688: line->data[line->size++] = ' '; /* Put character into line */
689: }
690: return;
691: }
692: /*NOTREACHED*/
693: } /* if tab */
694:
695:
696: if (ch==' ') {
697: text->permissible_split = line->size; /* Can split here */
698: }
699:
700: /* Check for end of line
701: */
702: if (indent + line->offset + line->size + style->rightIndent
703: >= HTScreenWidth) {
704: if (style->wordWrap) {
1.7 frystyk 705: if(text->permissible_split > line->size) /* HENRIK 21/02-94 */
706: text->permissible_split = line->size;
1.1 timbl 707: split_line(text, text->permissible_split);
708: if (ch==' ') return; /* Ignore space causing split */
709: } else new_line(text);
710: }
711:
712: /* Insert normal characters
713: */
714: if (ch == HT_NON_BREAK_SPACE) {
715: ch = ' ';
716: }
717: {
718: HTLine * line = text->last_line; /* May have changed */
719: HTFont font = style->font;
720: line->data[line->size++] = /* Put character into line */
721: font & HT_CAPITALS ? TOUPPER(ch) : ch;
722: if (font & HT_DOUBLE) /* Do again if doubled */
723: HText_appendCharacter(text, HT_NON_BREAK_SPACE);
724: /* NOT a permissible split */
725: }
726: }
727:
728: /* Anchor handling
729: ** ---------------
730: */
731: /* Start an anchor field
732: */
1.29 frystyk 733: PUBLIC void HText_beginAnchor (HText * text, HTChildAnchor * anc)
1.1 timbl 734: {
1.2 timbl 735: char marker[100];
1.34 frystyk 736: TextAnchor * a;
737: if ((a = (TextAnchor *) HT_MALLOC(sizeof(*a))) == NULL)
738: HT_OUTOFMEM("HText_beginAnchor");
1.1 timbl 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,
1.37 frystyk 781: const char * alt,
782: const char * alignment,
1.29 frystyk 783: BOOL isMap)
1.5 timbl 784: {
1.9 frystyk 785: HText_appendText(text, alt? alt : "[IMAGE]");
1.5 timbl 786: }
787:
1.37 frystyk 788: PUBLIC void HText_appendText (HText * text, const char * str)
1.1 timbl 789: {
1.37 frystyk 790: const char * p;
1.1 timbl 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: {
1.36 eric 815: HTTrace("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)
1.36 eric 923: HTTrace("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)
1.36 eric 936: HTTrace("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)
1.36 eric 948: HTTrace("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,
1.37 frystyk 1000: const char * aString,
1.29 frystyk 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)
1.36 eric 1059: HTTrace("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)
1.36 eric 1078: HTTrace("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) {
1.36 eric 1082: if (WWWTRACE) HTTrace("%s\n", notification);
1.29 frystyk 1083: } else {
1.20 frystyk 1084: if (CACHE_TRACE)
1.36 eric 1085: HTTrace(
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:
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