Annotation of OpenXM_contrib2/asir2000/gc5.3/cord/de.c, Revision 1.1
1.1 ! noro 1: /*
! 2: * Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
! 3: *
! 4: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
! 5: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
! 6: *
! 7: * Permission is hereby granted to use or copy this program
! 8: * for any purpose, provided the above notices are retained on all copies.
! 9: * Permission to modify the code and to distribute modified code is granted,
! 10: * provided the above notices are retained, and a notice that the code was
! 11: * modified is included with the above copyright notice.
! 12: *
! 13: * Author: Hans-J. Boehm (boehm@parc.xerox.com)
! 14: */
! 15: /*
! 16: * A really simple-minded text editor based on cords.
! 17: * Things it does right:
! 18: * No size bounds.
! 19: * Inbounded undo.
! 20: * Shouldn't crash no matter what file you invoke it on (e.g. /vmunix)
! 21: * (Make sure /vmunix is not writable before you try this.)
! 22: * Scrolls horizontally.
! 23: * Things it does wrong:
! 24: * It doesn't handle tabs reasonably (use "expand" first).
! 25: * The command set is MUCH too small.
! 26: * The redisplay algorithm doesn't let curses do the scrolling.
! 27: * The rule for moving the window over the file is suboptimal.
! 28: */
! 29: /* Boehm, February 6, 1995 12:27 pm PST */
! 30:
! 31: /* Boehm, May 19, 1994 2:20 pm PDT */
! 32: #include <stdio.h>
! 33: #include "gc.h"
! 34: #include "cord.h"
! 35:
! 36: #ifdef THINK_C
! 37: #define MACINTOSH
! 38: #include <ctype.h>
! 39: #endif
! 40:
! 41: #if defined(__BORLANDC__) && !defined(WIN32)
! 42: /* If this is DOS or win16, we'll fail anyway. */
! 43: /* Might as well assume win32. */
! 44: # define WIN32
! 45: #endif
! 46:
! 47: #if defined(WIN32)
! 48: # include <windows.h>
! 49: # include "de_win.h"
! 50: #elif defined(MACINTOSH)
! 51: # include <console.h>
! 52: /* curses emulation. */
! 53: # define initscr()
! 54: # define endwin()
! 55: # define nonl()
! 56: # define noecho() csetmode(C_NOECHO, stdout)
! 57: # define cbreak() csetmode(C_CBREAK, stdout)
! 58: # define refresh()
! 59: # define addch(c) putchar(c)
! 60: # define standout() cinverse(1, stdout)
! 61: # define standend() cinverse(0, stdout)
! 62: # define move(line,col) cgotoxy(col + 1, line + 1, stdout)
! 63: # define clrtoeol() ccleol(stdout)
! 64: # define de_error(s) { fprintf(stderr, s); getchar(); }
! 65: # define LINES 25
! 66: # define COLS 80
! 67: #else
! 68: # include <curses.h>
! 69: # define de_error(s) { fprintf(stderr, s); sleep(2); }
! 70: #endif
! 71: #include "de_cmds.h"
! 72:
! 73: /* List of line number to position mappings, in descending order. */
! 74: /* There may be holes. */
! 75: typedef struct LineMapRep {
! 76: int line;
! 77: size_t pos;
! 78: struct LineMapRep * previous;
! 79: } * line_map;
! 80:
! 81: /* List of file versions, one per edit operation */
! 82: typedef struct HistoryRep {
! 83: CORD file_contents;
! 84: struct HistoryRep * previous;
! 85: line_map map; /* Invalid for first record "now" */
! 86: } * history;
! 87:
! 88: history now = 0;
! 89: CORD current; /* == now -> file_contents. */
! 90: size_t current_len; /* Current file length. */
! 91: line_map current_map = 0; /* Current line no. to pos. map */
! 92: size_t current_map_size = 0; /* Number of current_map entries. */
! 93: /* Not always accurate, but reset */
! 94: /* by prune_map. */
! 95: # define MAX_MAP_SIZE 3000
! 96:
! 97: /* Current display position */
! 98: int dis_line = 0;
! 99: int dis_col = 0;
! 100:
! 101: # define ALL -1
! 102: # define NONE - 2
! 103: int need_redisplay = 0; /* Line that needs to be redisplayed. */
! 104:
! 105:
! 106: /* Current cursor position. Always within file. */
! 107: int line = 0;
! 108: int col = 0;
! 109: size_t file_pos = 0; /* Character position corresponding to cursor. */
! 110:
! 111: /* Invalidate line map for lines > i */
! 112: void invalidate_map(int i)
! 113: {
! 114: while(current_map -> line > i) {
! 115: current_map = current_map -> previous;
! 116: current_map_size--;
! 117: }
! 118: }
! 119:
! 120: /* Reduce the number of map entries to save space for huge files. */
! 121: /* This also affects maps in histories. */
! 122: void prune_map()
! 123: {
! 124: line_map map = current_map;
! 125: int start_line = map -> line;
! 126:
! 127: current_map_size = 0;
! 128: for(; map != 0; map = map -> previous) {
! 129: current_map_size++;
! 130: if (map -> line < start_line - LINES && map -> previous != 0) {
! 131: map -> previous = map -> previous -> previous;
! 132: }
! 133: }
! 134: }
! 135: /* Add mapping entry */
! 136: void add_map(int line, size_t pos)
! 137: {
! 138: line_map new_map = GC_NEW(struct LineMapRep);
! 139:
! 140: if (current_map_size >= MAX_MAP_SIZE) prune_map();
! 141: new_map -> line = line;
! 142: new_map -> pos = pos;
! 143: new_map -> previous = current_map;
! 144: current_map = new_map;
! 145: current_map_size++;
! 146: }
! 147:
! 148:
! 149:
! 150: /* Return position of column *c of ith line in */
! 151: /* current file. Adjust *c to be within the line.*/
! 152: /* A 0 pointer is taken as 0 column. */
! 153: /* Returns CORD_NOT_FOUND if i is too big. */
! 154: /* Assumes i > dis_line. */
! 155: size_t line_pos(int i, int *c)
! 156: {
! 157: int j;
! 158: size_t cur;
! 159: size_t next;
! 160: line_map map = current_map;
! 161:
! 162: while (map -> line > i) map = map -> previous;
! 163: if (map -> line < i - 2) /* rebuild */ invalidate_map(i);
! 164: for (j = map -> line, cur = map -> pos; j < i;) {
! 165: cur = CORD_chr(current, cur, '\n');
! 166: if (cur == current_len-1) return(CORD_NOT_FOUND);
! 167: cur++;
! 168: if (++j > current_map -> line) add_map(j, cur);
! 169: }
! 170: if (c != 0) {
! 171: next = CORD_chr(current, cur, '\n');
! 172: if (next == CORD_NOT_FOUND) next = current_len - 1;
! 173: if (next < cur + *c) {
! 174: *c = next - cur;
! 175: }
! 176: cur += *c;
! 177: }
! 178: return(cur);
! 179: }
! 180:
! 181: void add_hist(CORD s)
! 182: {
! 183: history new_file = GC_NEW(struct HistoryRep);
! 184:
! 185: new_file -> file_contents = current = s;
! 186: current_len = CORD_len(s);
! 187: new_file -> previous = now;
! 188: if (now != 0) now -> map = current_map;
! 189: now = new_file;
! 190: }
! 191:
! 192: void del_hist(void)
! 193: {
! 194: now = now -> previous;
! 195: current = now -> file_contents;
! 196: current_map = now -> map;
! 197: current_len = CORD_len(current);
! 198: }
! 199:
! 200: /* Current screen_contents; a dynamically allocated array of CORDs */
! 201: CORD * screen = 0;
! 202: int screen_size = 0;
! 203:
! 204: # ifndef WIN32
! 205: /* Replace a line in the curses stdscr. All control characters are */
! 206: /* displayed as upper case characters in standout mode. This isn't */
! 207: /* terribly appropriate for tabs. */
! 208: void replace_line(int i, CORD s)
! 209: {
! 210: register int c;
! 211: CORD_pos p;
! 212: size_t len = CORD_len(s);
! 213:
! 214: if (screen == 0 || LINES > screen_size) {
! 215: screen_size = LINES;
! 216: screen = (CORD *)GC_MALLOC(screen_size * sizeof(CORD));
! 217: }
! 218: # if !defined(MACINTOSH)
! 219: /* A gross workaround for an apparent curses bug: */
! 220: if (i == LINES-1 && len == COLS) {
! 221: s = CORD_substr(s, 0, CORD_len(s) - 1);
! 222: }
! 223: # endif
! 224: if (CORD_cmp(screen[i], s) != 0) {
! 225: move(i, 0); clrtoeol(); move(i,0);
! 226:
! 227: CORD_FOR (p, s) {
! 228: c = CORD_pos_fetch(p) & 0x7f;
! 229: if (iscntrl(c)) {
! 230: standout(); addch(c + 0x40); standend();
! 231: } else {
! 232: addch(c);
! 233: }
! 234: }
! 235: screen[i] = s;
! 236: }
! 237: }
! 238: #else
! 239: # define replace_line(i,s) invalidate_line(i)
! 240: #endif
! 241:
! 242: /* Return up to COLS characters of the line of s starting at pos, */
! 243: /* returning only characters after the given column. */
! 244: CORD retrieve_line(CORD s, size_t pos, unsigned column)
! 245: {
! 246: CORD candidate = CORD_substr(s, pos, column + COLS);
! 247: /* avoids scanning very long lines */
! 248: int eol = CORD_chr(candidate, 0, '\n');
! 249: int len;
! 250:
! 251: if (eol == CORD_NOT_FOUND) eol = CORD_len(candidate);
! 252: len = (int)eol - (int)column;
! 253: if (len < 0) len = 0;
! 254: return(CORD_substr(s, pos + column, len));
! 255: }
! 256:
! 257: # ifdef WIN32
! 258: # define refresh();
! 259:
! 260: CORD retrieve_screen_line(int i)
! 261: {
! 262: register size_t pos;
! 263:
! 264: invalidate_map(dis_line + LINES); /* Prune search */
! 265: pos = line_pos(dis_line + i, 0);
! 266: if (pos == CORD_NOT_FOUND) return(CORD_EMPTY);
! 267: return(retrieve_line(current, pos, dis_col));
! 268: }
! 269: # endif
! 270:
! 271: /* Display the visible section of the current file */
! 272: void redisplay(void)
! 273: {
! 274: register int i;
! 275:
! 276: invalidate_map(dis_line + LINES); /* Prune search */
! 277: for (i = 0; i < LINES; i++) {
! 278: if (need_redisplay == ALL || need_redisplay == i) {
! 279: register size_t pos = line_pos(dis_line + i, 0);
! 280:
! 281: if (pos == CORD_NOT_FOUND) break;
! 282: replace_line(i, retrieve_line(current, pos, dis_col));
! 283: if (need_redisplay == i) goto done;
! 284: }
! 285: }
! 286: for (; i < LINES; i++) replace_line(i, CORD_EMPTY);
! 287: done:
! 288: refresh();
! 289: need_redisplay = NONE;
! 290: }
! 291:
! 292: int dis_granularity;
! 293:
! 294: /* Update dis_line, dis_col, and dis_pos to make cursor visible. */
! 295: /* Assumes line, col, dis_line, dis_pos are in bounds. */
! 296: void normalize_display()
! 297: {
! 298: int old_line = dis_line;
! 299: int old_col = dis_col;
! 300:
! 301: dis_granularity = 1;
! 302: if (LINES > 15 && COLS > 15) dis_granularity = 2;
! 303: while (dis_line > line) dis_line -= dis_granularity;
! 304: while (dis_col > col) dis_col -= dis_granularity;
! 305: while (line >= dis_line + LINES) dis_line += dis_granularity;
! 306: while (col >= dis_col + COLS) dis_col += dis_granularity;
! 307: if (old_line != dis_line || old_col != dis_col) {
! 308: need_redisplay = ALL;
! 309: }
! 310: }
! 311:
! 312: # if defined(WIN32)
! 313: # elif defined(MACINTOSH)
! 314: # define move_cursor(x,y) cgotoxy(x + 1, y + 1, stdout)
! 315: # else
! 316: # define move_cursor(x,y) move(y,x)
! 317: # endif
! 318:
! 319: /* Adjust display so that cursor is visible; move cursor into position */
! 320: /* Update screen if necessary. */
! 321: void fix_cursor(void)
! 322: {
! 323: normalize_display();
! 324: if (need_redisplay != NONE) redisplay();
! 325: move_cursor(col - dis_col, line - dis_line);
! 326: refresh();
! 327: # ifndef WIN32
! 328: fflush(stdout);
! 329: # endif
! 330: }
! 331:
! 332: /* Make sure line, col, and dis_pos are somewhere inside file. */
! 333: /* Recompute file_pos. Assumes dis_pos is accurate or past eof */
! 334: void fix_pos()
! 335: {
! 336: int my_col = col;
! 337:
! 338: if ((size_t)line > current_len) line = current_len;
! 339: file_pos = line_pos(line, &my_col);
! 340: if (file_pos == CORD_NOT_FOUND) {
! 341: for (line = current_map -> line, file_pos = current_map -> pos;
! 342: file_pos < current_len;
! 343: line++, file_pos = CORD_chr(current, file_pos, '\n') + 1);
! 344: line--;
! 345: file_pos = line_pos(line, &col);
! 346: } else {
! 347: col = my_col;
! 348: }
! 349: }
! 350:
! 351: #if defined(WIN32)
! 352: # define beep() Beep(1000 /* Hz */, 300 /* msecs */)
! 353: #elif defined(MACINTOSH)
! 354: # define beep() SysBeep(1)
! 355: #else
! 356: /*
! 357: * beep() is part of some curses packages and not others.
! 358: * We try to match the type of the builtin one, if any.
! 359: */
! 360: #ifdef __STDC__
! 361: int beep(void)
! 362: #else
! 363: int beep()
! 364: #endif
! 365: {
! 366: putc('\007', stderr);
! 367: return(0);
! 368: }
! 369: #endif
! 370:
! 371: # define NO_PREFIX -1
! 372: # define BARE_PREFIX -2
! 373: int repeat_count = NO_PREFIX; /* Current command prefix. */
! 374:
! 375: int locate_mode = 0; /* Currently between 2 ^Ls */
! 376: CORD locate_string = CORD_EMPTY; /* Current search string. */
! 377:
! 378: char * arg_file_name;
! 379:
! 380: #ifdef WIN32
! 381: /* Change the current position to whatever is currently displayed at */
! 382: /* the given SCREEN coordinates. */
! 383: void set_position(int c, int l)
! 384: {
! 385: line = l + dis_line;
! 386: col = c + dis_col;
! 387: fix_pos();
! 388: move_cursor(col - dis_col, line - dis_line);
! 389: }
! 390: #endif /* WIN32 */
! 391:
! 392: /* Perform the command associated with character c. C may be an */
! 393: /* integer > 256 denoting a windows command, one of the above control */
! 394: /* characters, or another ASCII character to be used as either a */
! 395: /* character to be inserted, a repeat count, or a search string, */
! 396: /* depending on the current state. */
! 397: void do_command(int c)
! 398: {
! 399: int i;
! 400: int need_fix_pos;
! 401: FILE * out;
! 402:
! 403: if ( c == '\r') c = '\n';
! 404: if (locate_mode) {
! 405: size_t new_pos;
! 406:
! 407: if (c == LOCATE) {
! 408: locate_mode = 0;
! 409: locate_string = CORD_EMPTY;
! 410: return;
! 411: }
! 412: locate_string = CORD_cat_char(locate_string, (char)c);
! 413: new_pos = CORD_str(current, file_pos - CORD_len(locate_string) + 1,
! 414: locate_string);
! 415: if (new_pos != CORD_NOT_FOUND) {
! 416: need_redisplay = ALL;
! 417: new_pos += CORD_len(locate_string);
! 418: for (;;) {
! 419: file_pos = line_pos(line + 1, 0);
! 420: if (file_pos > new_pos) break;
! 421: line++;
! 422: }
! 423: col = new_pos - line_pos(line, 0);
! 424: file_pos = new_pos;
! 425: fix_cursor();
! 426: } else {
! 427: locate_string = CORD_substr(locate_string, 0,
! 428: CORD_len(locate_string) - 1);
! 429: beep();
! 430: }
! 431: return;
! 432: }
! 433: if (c == REPEAT) {
! 434: repeat_count = BARE_PREFIX; return;
! 435: } else if (c < 0x100 && isdigit(c)){
! 436: if (repeat_count == BARE_PREFIX) {
! 437: repeat_count = c - '0'; return;
! 438: } else if (repeat_count != NO_PREFIX) {
! 439: repeat_count = 10 * repeat_count + c - '0'; return;
! 440: }
! 441: }
! 442: if (repeat_count == NO_PREFIX) repeat_count = 1;
! 443: if (repeat_count == BARE_PREFIX && (c == UP || c == DOWN)) {
! 444: repeat_count = LINES - dis_granularity;
! 445: }
! 446: if (repeat_count == BARE_PREFIX) repeat_count = 8;
! 447: need_fix_pos = 0;
! 448: for (i = 0; i < repeat_count; i++) {
! 449: switch(c) {
! 450: case LOCATE:
! 451: locate_mode = 1;
! 452: break;
! 453: case TOP:
! 454: line = col = file_pos = 0;
! 455: break;
! 456: case UP:
! 457: if (line != 0) {
! 458: line--;
! 459: need_fix_pos = 1;
! 460: }
! 461: break;
! 462: case DOWN:
! 463: line++;
! 464: need_fix_pos = 1;
! 465: break;
! 466: case LEFT:
! 467: if (col != 0) {
! 468: col--; file_pos--;
! 469: }
! 470: break;
! 471: case RIGHT:
! 472: if (CORD_fetch(current, file_pos) == '\n') break;
! 473: col++; file_pos++;
! 474: break;
! 475: case UNDO:
! 476: del_hist();
! 477: need_redisplay = ALL; need_fix_pos = 1;
! 478: break;
! 479: case BS:
! 480: if (col == 0) {
! 481: beep();
! 482: break;
! 483: }
! 484: col--; file_pos--;
! 485: /* fall through: */
! 486: case DEL:
! 487: if (file_pos == current_len-1) break;
! 488: /* Can't delete trailing newline */
! 489: if (CORD_fetch(current, file_pos) == '\n') {
! 490: need_redisplay = ALL; need_fix_pos = 1;
! 491: } else {
! 492: need_redisplay = line - dis_line;
! 493: }
! 494: add_hist(CORD_cat(
! 495: CORD_substr(current, 0, file_pos),
! 496: CORD_substr(current, file_pos+1, current_len)));
! 497: invalidate_map(line);
! 498: break;
! 499: case WRITE:
! 500: {
! 501: CORD name = CORD_cat(CORD_from_char_star(arg_file_name),
! 502: ".new");
! 503:
! 504: if ((out = fopen(CORD_to_const_char_star(name), "wb")) == NULL
! 505: || CORD_put(current, out) == EOF) {
! 506: de_error("Write failed\n");
! 507: need_redisplay = ALL;
! 508: } else {
! 509: fclose(out);
! 510: }
! 511: }
! 512: break;
! 513: default:
! 514: {
! 515: CORD left_part = CORD_substr(current, 0, file_pos);
! 516: CORD right_part = CORD_substr(current, file_pos, current_len);
! 517:
! 518: add_hist(CORD_cat(CORD_cat_char(left_part, (char)c),
! 519: right_part));
! 520: invalidate_map(line);
! 521: if (c == '\n') {
! 522: col = 0; line++; file_pos++;
! 523: need_redisplay = ALL;
! 524: } else {
! 525: col++; file_pos++;
! 526: need_redisplay = line - dis_line;
! 527: }
! 528: break;
! 529: }
! 530: }
! 531: }
! 532: if (need_fix_pos) fix_pos();
! 533: fix_cursor();
! 534: repeat_count = NO_PREFIX;
! 535: }
! 536:
! 537: /* OS independent initialization */
! 538:
! 539: void generic_init(void)
! 540: {
! 541: FILE * f;
! 542: CORD initial;
! 543:
! 544: if ((f = fopen(arg_file_name, "rb")) == NULL) {
! 545: initial = "\n";
! 546: } else {
! 547: initial = CORD_from_file(f);
! 548: if (initial == CORD_EMPTY
! 549: || CORD_fetch(initial, CORD_len(initial)-1) != '\n') {
! 550: initial = CORD_cat(initial, "\n");
! 551: }
! 552: }
! 553: add_map(0,0);
! 554: add_hist(initial);
! 555: now -> map = current_map;
! 556: now -> previous = now; /* Can't back up further: beginning of the world */
! 557: need_redisplay = ALL;
! 558: fix_cursor();
! 559: }
! 560:
! 561: #ifndef WIN32
! 562:
! 563: main(argc, argv)
! 564: int argc;
! 565: char ** argv;
! 566: {
! 567: int c;
! 568:
! 569: #if defined(MACINTOSH)
! 570: console_options.title = "\pDumb Editor";
! 571: cshow(stdout);
! 572: GC_init();
! 573: argc = ccommand(&argv);
! 574: #endif
! 575:
! 576: if (argc != 2) goto usage;
! 577: arg_file_name = argv[1];
! 578: setvbuf(stdout, GC_MALLOC_ATOMIC(8192), _IOFBF, 8192);
! 579: initscr();
! 580: noecho(); nonl(); cbreak();
! 581: generic_init();
! 582: while ((c = getchar()) != QUIT) {
! 583: if (c == EOF) break;
! 584: do_command(c);
! 585: }
! 586: done:
! 587: move(LINES-1, 0);
! 588: clrtoeol();
! 589: refresh();
! 590: nl();
! 591: echo();
! 592: endwin();
! 593: exit(0);
! 594: usage:
! 595: fprintf(stderr, "Usage: %s file\n", argv[0]);
! 596: fprintf(stderr, "Cursor keys: ^B(left) ^F(right) ^P(up) ^N(down)\n");
! 597: fprintf(stderr, "Undo: ^U Write to <file>.new: ^W");
! 598: fprintf(stderr, "Quit:^D Repeat count: ^R[n]\n");
! 599: fprintf(stderr, "Top: ^T Locate (search, find): ^L text ^L\n");
! 600: exit(1);
! 601: }
! 602:
! 603: #endif /* !WIN32 */
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