1: # The LearningOnline Network
2: # entity -> tex.
3: #
4: # $Id:
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: # http://www.lon-capa.org/
26: #
27: #
28: package Apache::entities;
29: use strict;
30: #
31: # This file contains a table driven entity-->latex converter.
32: #
33: # Assumptions:
34: # The number of entities in a resource is small compared with the
35: # number of possible entities that might be translated.
36: # Therefore the strategy is to match a general entity pattern
37: # &.+; over and over, pull out the match look it up in an entity -> tex hash
38: # and do the replacement.
39: #
40: # In order to simplify the hash, the following reductions are done:
41: # &#d+; have the &# and ; stripped and is converted to an int.
42: # &#.+; have the &#x and ; stripped and is converted to an int as a hex
43: # value.
44: # All others have the & and ; stripped.
45:
46:
47: # The hash: Add new conversions here; leave off the leading & and the trailing ;
48: # all numeric entities need only appear as their decimal versions
49: # (e.g. no need for 1234 is sufficient, no need for 0x4d2 as well.
50: #
51: # This entity table is mercilessly cribbed from the HTML pocket reference
52: # table starting at pg 82. In most cases the LaTeX equivalent codes come from
53: # the original massive regular expression replacements originally by
54: # A. Sakharuk in lonprintout.pm
55: #
56: # I also want to acknowledge
57: # ISO Character entities and their LaTeX equivalents by
58: # Vidar Bronken Gundersen, and Rune Mathisen
59: # http://www.bitjungle.com/isoent-ref.pdf
60: #
61:
62: # Note numerical entities are essentially unicode character codes.
63: #
64: package Apache::entities;
65:
66: my %entities = (
67:
68: # ---- ASCII code page: ----------------
69:
70: # Translation to empty strings:
71:
72: 7 => "",
73: 9 => "",
74: 10 => "",
75: 13 => "",
76:
77: # Translations to simple characters:
78:
79: 32 => " ",
80: 33 => "!",
81: 34 => '"',
82: 'quot' => '"',
83: 35 => '\\\#',
84: 36 => '\\\$',
85: 37 => '\\%',
86: 38 => '\\&',
87: 'amp' => '\\&',
88: 39 => '\'', # Apostrophe
89: 40 => '(',
90: 41 => ')',
91: 42 => '\*',
92: 43 => '\+',
93: 44 => ',', # comma
94: 45 => '-',
95: 46 => '\.',
96: 47 => '\/',
97: 48 => '0',
98: 49 => '1',
99: 50 => '2',
100: 51 => '3',
101: 52 => '4',
102: 53 => '5',
103: 54 => '6',
104: 55 => '7',
105: 56 => '8',
106: 57 => '9',
107: 58 => ':',
108: 59 => ';',
109: 60 => '\\ensuremath\{<\}',
110: 'lt' => '\\ensuremath\{<\}',
111: 61 => '\\ensuremath\{=\}',
112: 62 => '\\ensuremath\{>\}',
113: 'gt' => '\\ensuremath\{>\}',
114: 63 => '\?',
115: 64 => '@',
116: 65 => 'A',
117: 66 => 'B',
118: 67 => 'C',
119: 68 => 'D',
120: 69 => 'E',
121: 70 => 'F',
122: 71 => 'G',
123: 72 => 'H',
124: 73 => 'I',
125: 74 => 'J',
126: 75 => 'K',
127: 76 => 'L',
128: 77 => 'M',
129: 78 => 'N',
130: 79 => 'O',
131: 80 => 'P',
132: 81 => 'Q',
133: 82 => 'R',
134: 83 => 'S',
135: 84 => 'T',
136: 85 => 'U',
137: 86 => 'V',
138: 87 => 'W',
139: 88 => 'X',
140: 89 => 'Y',
141: 90 => 'Z',
142: 91 => '[',
143: 92 => '\\ensuremath\{\\setminus\}', # \setminus is \ with special spacing.
144: 93 => ']',
145: 94 => '\\ensuremath\{\\wedge\}',
146: 95 => '\\underline\{\\makebox[2mm]\\{\\strut\}\}', # Underline 2mm of space for _
147: 96 => '`',
148: 97 => 'a',
149: 98 => 'b',
150: 99 => 'c',
151: 100 => 'd',
152: 101 => 'e',
153: 102 => 'f',
154: 103 => 'g',
155: 104 => 'h',
156: 105 => 'i',
157: 106 => 'j',
158: 107 => 'k',
159: 108 => 'l',
160: 109 => 'm',
161: 110 => 'n',
162: 111 => 'o',
163: 112 => 'p',
164: 113 => 'q',
165: 114 => 'r',
166: 115 => 's',
167: 116 => 't',
168: 117 => 'u',
169: 118 => 'v',
170: 119 => 'w',
171: 120 => 'x',
172: 121 => 'y',
173: 122 => 'z',
174: 123 => '\\{',
175: 124 => '\|',
176: 125 => '\\}',
177: 126 => '\~',
178:
179: # Controls and Latin-1 supplement. Note that some entities that have
180: # visible effect are not printing unicode characters. Specifically
181: # ‚- 
182:
183: 130 => ',',
184: 131 => '\\textflorin ',
185: 132 => ',,', # Low double left quotes.
186: 133 => '\\ensuremath\{\\ldots\}',
187: 134 => '\\ensuremath\{\\dagger\}',
188: 135 => '\\ensuremath\{\\ddagger\}',
189: 136 => '\\ensuremath\{\\wedge\}',
190: 137 => '\\textperthousand ',
191: 138 => '\\v\{S\}',
192: 139 => '\\ensuremath\{<\}',
193: 140 => '\{\\OE\}',
194:
195: # There's a gap here in my entity table
196:
197: 145 => '\`',
198: 146 => '\'',
199: 147 => '\`\`',
200: 148 => '\'\'',
201: 149 => '\\ensuremath\{\\bullet\}',
202: 150 => '--',
203: 151 => '---',
204: 152 => '\\ensuremath\{\\sim\}',
205: 153 => '\\texttrademark',
206: 154 => '\\v\{s\}',
207: 155 => '\\ensuremath\{>\}',
208: 156 => '\\oe ',
209:
210: # Another short gap:
211:
212: 159 => '\\"Y',
213: 160 => '~',
214: 'nbsp' => '~',
215: 161 => '\\textexclamdown ',
216: 'iexcl' => '\\textexclamdown ',
217: 162 => '\\textcent ',
218: 'cent' => '\\textcent ',
219: 163 => '\\pounds ',
220: 'pound' => '\\pounds ',
221: 164 => '\\textcurrency ',
222: 'curren' => '\\textcurrency ',
223: 165 => '\\textyen ',
224: 'yen' => '\\textyen ',
225: 166 => '\\textbrokenbar ',
226: 'brvbar' => '\\textbrokenbar ',
227: 167 => '\\textsection ',
228: 'sect' => '\\textsection ',
229: 168 => '\\texthighdieresis ',
230: 'uml' => '\\texthighdieresis ',
231: 169 => '\\copyright ',
232: 'copy' => '\\copyright ',
233: 170 => '\\textordfeminine ',
234: 'ordf' => '\\textordfeminine ',
235: 171 => '\\ensuremath\{\ll\}', # approximation of left angle quote.
236: 'laquo' => '\\ensuremath\{\ll\}', # ""
237: 172 => '\\ensuremath\{\\neg\}',
238: 'not' => '\\ensuremath\{\\neg\}',
239: 173 => ' - ',
240: 'shy' => ' - ',
241: 174 => '\\textregistered ',
242: 'reg' => '\\textregistered ',
243: 175 => '\\ensuremath\{^\{-\}\}',
244: 'macr' => '\\ensuremath\{^\{-\}\}',
245: 176 => '\\ensuremath\{^\{\\circ\}\}',
246: 'deg' => '\\ensuremath\{^\{\\circ\}\}',
247: 177 => '\\ensuremath\{\\pm\}',
248: 'plusmn' => '\\ensuremath\{\\pm\}',
249: 178 => '\\ensuremath\{^2\}',
250: 'sup2' => '\\ensuremath\{^2\}',
251: 179 => '\\ensuremath\{^3\}',
252: 'sup3' => '\\ensuremath\{^3\}',
253: 180 => '\\textacute ',
254: 'acute' => '\\textacute ',
255: 181 => '\\ensuremath\{\\mu\}',
256: 'micro' => '\\ensuremath\{\\mu\}',
257: 182 => '\\P ',
258: para => '\\P ',
259: 183 => '\\ensuremath\{\\cdot\}',
260: 'middot' => '\\ensuremath\{\\cdot\}',
261: 184 => '\\c\{\\strut\}',
262: 'cedil' => '\\c\{\\strut\}',
263: 185 => '\\ensuremath\{^1\}',
264: sup1 => '\\ensuremath\{^1\}',
265: 186 => '\\textordmasculine ',
266: 'ordm' => '\\textordmasculine ',
267: 187 => '\\ensuremath\{\\gg\}',
268: 'raquo' => '\\ensuremath\{\\gg\}',
269: 188 => '\\textonequarter ',
270: 'frac14' => '\\textonequarter ',
271: 189 => '\\textonehalf' ,
272: 'frac12' => '\\textonehalf' ,
273: 190 => '\\textthreequarters ',
274: 'frac34' => '\\textthreequarters ',
275: 191 => '\\textquestiondown ',
276: 'iquest' => '\\textquestiondown ',
277: 192 => '\\\`\{A\}',
278: 'Agrave' => '\\\`\{A\}',
279: 193 => '\\\'\{A\}',
280: 'Aacute' => '\\\'\{A\}',
281: 194 => '\\^\{A\}',
282: 'Acirc' => '\\^\{A\}',
283: 195 => '\\~{A}',
284: 'Atilde'=> '\\~{A}',
285: 196 => '\\\"{A}',
286: 'Auml' => '\\\"{A}',
287: 197 => '{\\AA}',
288: 'Aring' => '{\\AA}',
289: 198 => '{\\AE}',
290: 'AElig' => '{\\AE}',
291: 199 => '\\c{c}',
292: 'Ccedil'=> '\\c{c}',
293: '200' => '\\\`{E}',
294: 'Egrave'=> '\\\`{E}',
295: 201 => '\\\'{E}',
296: 'Eacute'=> '\\\'{E}',
297: 202 => '\\\^{E}',
298: 'Ecirc' => '\\\^{E}',
299: 203 => '\\\"{E}',
300: 'Euml' => '\\\"{E}',
301: 204 => '\\\`{I}',
302: 'Igrave'=> '\\\`{I}',
303: 205 => '\\\'{I}',
304: 'Iacute'=> '\\\'{I}',
305: 206 => '\\\^{I}',
306: 'Icirc' => '\\\^{I}',
307: 207 => '\\\"{I}',
308: 'Iuml' => '\\\"{I}',
309: 208 => '\\OE',
310: 'ETH' => '\\OE',
311: 209 => '\\~{N}',
312: 'Ntilde'=> '\\~{N}',
313: 210 => '\\\`{O}',
314: 'Ograve'=> '\\\`{O}',
315: 211 => '\\\'{O}',
316: 'Oacute'=> '\\\'{O}',
317: 212 => '\\\^{O}',
318: 'Ocirc' => '\\\^{O}',
319: 213 => '\\~{O}',
320: 'Otilde'=> '\\~{O}',
321: 214 => '\\\"{O}',
322: 'Ouml' => '\\\"{O}',
323: 215 => '\\ensuremath\{\\times\}',
324: 'times' => '\\ensuremath\{\\times\}',
325: 216 => '\\O',
326: 'Oslash'=> '\\O',
327: 217 => '\\\`{U}',
328: 'Ugrave'=> '\\\`{U}',
329: 218 => '\\\'{U}',
330: 'Uacute'=> '\\\'{U}',
331: 219 => '\\\^{U}',
332: 'Ucirc' => '\\\^{U}',
333: 220 => '\\\"{U}',
334: 'Uuml' => '\\\"{U}',
335: 221 => '\\\'{Y}',
336: 'Yacute'=> '\\\'{Y}',
337: 222 => '\\TH',
338: 'THORN' => '\\TH',
339: 223 => '{\\sz}',
340: 'szlig' => '{\\sz}',
341: 224 => '\\\`{a}',
342: 'agrave'=> '\\\`{a}',
343: 225 => '\\\'{a}',
344: 'aacute'=> '\\\'{a}',
345: 226 => '\\\^{a}',
346: 'acirc' => '\\\^{a}',
347: 227 => '\\\~{a}',
348: 'atilde'=> '\\\~{a}',
349: 228 => '\\\"{a}',
350: 'auml' => '\\\"{a}',
351: 229 => '\\aa',
352: 'aring' => '\\aa',
353: 230 => '\\ae',
354: 'aelig' => '\\ae',
355: 231 => '\\c{c}',
356: 'ccedil'=> '\\c{c}',
357: 232 => '\\\`{e}',
358: 'egrave'=> '\\\`{e}',
359: 233 => '\\\'{e}',
360: 'eacute'=> '\\\'{e}',
361: 234 => '\\\^{e}',
362: 'ecirc' => '\\\^{e}',
363: 235 => '\\\"{e}',
364: 'euml' => '\\\"{e}',
365: 236 => '\\\`{i}',
366: 'igrave'=> '\\\`{i}',
367: 237 => '\\\'{i}',
368: 'iacute'=> '\\\'{i}',
369: 238 => '\\\^{i}',
370: 'icirc' => '\\\^{i}',
371: 239 => '\\\"{i}',
372: 'iuml' => '\\\"{i}',
373: 240 => '\\dh',
374: 'eth' => '\\dh',
375: 241 => '\\\~{n}',
376: 'ntilde'=> '\\\~{n}',
377: 242 => '\\\`{o}',
378: 'ograve'=> '\\\`{o}',
379: 243 => '\\\'{o}',
380: 'oacute'=> '\\\'{o}',
381: 244 => '\\\^{o}',
382: 'ocirc' => '\\\^{o}',
383: 245 => '\\\~{o}',
384: 'otilde'=> '\\\~{o}',
385: 246 => '\\\"{o}',
386: 'ouml' => '\\\"{o}',
387: 247 => '\\ensuremath\{\\div\}',
388: 'divide'=> '\\ensuremath\{\\div\}',
389: 248 => '{\\o}',
390: 'oslash'=> '{\\o}',
391: 249 => '\\\`{u}',
392: 'ugrave'=> '\\\`{u}',
393: 250 => '\\\'{u}',
394: 'uacute'=> '\\\'{u}',
395: 251 => '\\\^{u}',
396: 'ucirc' => '\\\^{u}',
397: 252 => '\\\"{u}',
398: 'uuml' => '\\\"{u}',
399: 253 => '\\\'{y}',
400: 'yacute'=> '\\\'{y}',
401: 254 => '\\th',
402: 'thorn' => '\\th',
403: 255 => '\\\"{y}',
404: 'yuml' => '\\\"{y}',
405:
406: # hbar entity number comes from the unicode charater:
407: # see e.g. http://www.unicode.org/charts/PDF/U0100.pdf
408: # ISO also documents a 'planck' entity.
409:
410: 295 => '\\ensuremath\{\hbar\}',
411: 'planck' => '\\ensuremath\{\hbar\}',
412:
413: # Latin extended-A HTML 4.01 entities:
414:
415: 338 => '\\OE',
416: 'OElig' => '\\OE',
417: 339 => '\\oe',
418: 'oelig' => '\\oe',
419: 352 => '\\v{S}',
420: 'Scaron' => '\\v{S}',
421: 353 => '\\v{s}',
422: 'scaron' => '\\v{s}',
423: 376 => '\\\"{Y}',
424: 'Yuml' => '\\\"{Y}',
425:
426:
427: # Latin extended B HTML 4.01 entities
428:
429: 402 => '\\ensuremath{f}',
430: 'fnof' => '\\ensuremath{f}',
431:
432: # Spacing modifier letters:
433:
434: 710 => '\^{}',
435: 'circ' => '\^{}',
436: 732 => '\~{}',
437: 'tilde' => '\~{}',
438:
439: # Greek uppercase:
440:
441: 913 => '\\ensuremath\{\\mathrm\{A\}\}',
442: 'Alpha' => '\\ensuremath\{\\mathrm\{A\}\}',
443: 914 => '\\ensuremath\{\\mathrm\{B\}\}',
444: 'Beta' => '\\ensuremath\{\\mathrm\{B\}\}',
445: 915 => '\\ensuremath\{\\Gamma\}',
446: 'Gamma' => '\\ensuremath\{\\Gamma\}',
447: 916 => '\\ensuremath\{\\Delta\}',
448: 'Delta' => '\\ensuremath\{\\Delta\}',
449: 917 => '\\ensuremath\{\\mathrm\{E\}\}',
450: 'Epsilon'=> '\\ensuremath\{\\mathrm\{E\}\}',
451: 918 => '\\ensuremath\{\\mathrm\{Z\}\}',
452: 'Zeta' => '\\ensuremath\{\\mathrm\{Z\}\}',
453: 919 => '\\ensuremath\{\\mathrm\{H\}\}',
454: 'Eta' => '\\ensuremath\{\\mathrm\{H\}\}',
455: 920 => '\\ensuremath\{\\Theta\}',
456: 'Theta' => '\\ensuremath\{\\Theta\}',
457: 921 => '\\ensuremath\{\\mathrm\{I\}\}',
458: 'Iota' => '\\ensuremath\{\\mathrm\{I\}\}',
459: 922 => '\\ensuremath\{\\mathrm\{K\}\}',
460: 'Kappa' => '\\ensuremath\{\\mathrm\{K\}\}',
461: 923 => '\\ensuremath\{\\Lambda\}',
462: 'Lambda' => '\\ensuremath\{\\Lambda\}',
463: 924 => '\\ensuremath\{\\mathrm\{M\}\}',
464: 'Mu' => '\\ensuremath\{\\mathrm\{M\}\}',
465: 925 => '\\ensuremath\{\\mathrm\{N\}\}',
466: 'Nu' => '\\ensuremath\{\\mathrm\{N\}\}',
467: 926 => '\\ensuremath\{\\mathrm\{\\Xi\}',
468: 'Xi' => '\\ensuremath\{\\mathrm\{\\Xi\}',
469: 927 => '\\ensuremath\{\\mathrm\{O\}\}',
470: 'Omicron'=> '\\ensuremath\{\\mathrm\{O\}\}',
471: 928 => '\\ensuremath\{\\Pi\}',
472: 'Pi' => '\\ensuremath\{\\Pi\}',
473: 929 => '\\ensuremath\{\\mathrm\{P\}\}',
474: 'Rho' => '\\ensuremath\{\\mathrm\{P\}\}',
475:
476: # Skips 930
477:
478: 931 => '\\ensuremath\{\Sigma\}',
479: 'Sigma' => '\\ensuremath\{\Sigma\}',
480: 932 => '\\ensuremath\{\\mathrm\{T\}\}',
481: 'Tau' => '\\ensuremath\{\\mathrm\{T\}\}',
482: 933 => '\\ensuremath\{\\Upsilon\}',
483: 'Upsilon'=> '\\ensuremath\{\\Upsilon\}',
484: 934 => '\\ensuremath\{\\Phi\}',
485: 'Phi' => '\\ensuremath\{\\Phi\}',
486: 935 => '\\ensuremath\{\\mathrm\{X\}\}',
487: 'Chi' => '\\ensuremath\{\\mathrm\{X\}\}',
488: 936 => '\\ensuremath\{\\Psi\}',
489: 'Psi' => '\\ensuermath\{\\Psi\}',
490: 937 => '\\ensuremath\{\\Omega\}',
491: 'Omega' => '\\ensuremath\{\\Omega\}',
492:
493:
494: # Greek lowercase:
495:
496: 945 => '\\ensuremath\{\\alpha\}',
497: 'alpha' => '\\ensuremath\{\\alpha\}',
498: 946 => '\\ensuremath\{\\beta\}',
499: 'beta' => '\\ensuremath\{\\beta\}',
500: 947 => '\\ensuremath\{\\gamma\}',
501: 'gamma' => '\\ensuremath\{\\gamma\}',
502: 948 => '\\ensuremath\{\\delta\}',
503: 'delta' => '\\ensuremath\{\\delta\}',
504: 949 => '\\ensuremath\{\\epsilon\}',
505: 'epsilon'=> '\\ensuremath\{\\epsilon\}',
506: 950 => '\\ensuremath\{\\zeta\}',
507: 'zeta' => '\\ensuremath\{\\zeta\}',
508: 951 => '\\ensuremath\{\\eta\}',
509: 'eta' => '\\ensuremath\{\\eta\}',
510: 952 => '\\ensuremath\{\\theta\}',
511: 'theta' => '\\ensuremath\{\\theta\}',
512: 953 => '\\ensuremath\{\\iota\}',
513: 'iota' => '\\ensuremath\{\\iota\}',
514: 954 => '\\ensuremath\{\\kappa\}',
515: 'kappa' => '\\ensuremath\{\\kappa\}',
516: 955 => '\\ensuremath\{\\lambda\}',
517: 'lambda' => '\\ensuremath\{\\lambda\}',
518: 956 => '\\ensuremath\{\\mu\}',
519: 'mu' => '\\ensuremath\{\\mu\}',
520: 957 => '\\ensuremath\{\\nu\}',
521: 'nu' => '\\ensuremath\{\\nu\}',
522: 958 => '\\ensuremath\{\\xi\}',
523: 'xi' => '\\ensuremath\{\\xi\}',
524: 959 => '\\ensuremath\{o\}',
525: 'omicron'=> '\\ensuremath\{o\}',
526: 960 => '\\ensuremath\{\\pi\}',
527: 'pi' => '\\ensuremath\{\\pi\}',
528: 961 => '\\ensuremath\{\\rho\}',
529: 'rho' => '\\ensuremath\{\\rho\}',
530: 962 => '\\ensuremath\{\\varsigma\}',
531: 'sigmaf' => '\\ensuremath\{\\varsigma\}',
532: 963 => '\\ensuremath\{\\sigma\}',
533: 'sigma' => '\\ensuremath\{\\sigma\}',
534: 964 => '\\ensuremath\{\\tau\}',
535: 'tau' => '\\ensuremath\{\\tau\}',
536: 965 => '\\ensuremath\{\\upsilon\}',
537: 'upsilon'=> '\\ensuremath\{\\upsilon\}',
538: 966 => '\\ensuremath\{\\phi\}',
539: 'phi' => '\\ensuremath\{\\phi\}',
540: 967 => '\\ensuremath\{\\chi\}',
541: 'chi' => '\\ensuremath\{\\chi\}',
542: 968 => '\\ensuremath\{\\psi\}',
543: 'psi' => '\\ensuremath\{\\psi\}',
544: 969 => '\\ensuremath\{\\omega\}',
545: 'omega' => '\\ensuremath\{\\omega\}',
546: 977 => '\\ensuremath\{\\vartheta\}',
547: 'thetasym'=>'\\ensuremath\{\\vartheta\}',
548: 978 => '\\ensuremath\{\\varUpsilon\}',
549: 'upsih' => '\\ensuremath\{\\varUpsilon\}',
550: 982 => '\\ensuremath\{\\varpi\}',
551: 'piv' => '\\ensuremath\{\\varpi\}',
552:
553:
554: # The general punctuation set:
555:
556: 8194, => '\\hspace{.5em}',
557: 'enspc' => '\\hspace{.5em}',
558: 8195 => '\\hspace{1.0em}',
559: 'emspc' => '\\hspace{1.0em}',
560: 8201 => '\\hspace{0.167em}',
561: 'thinsp' => '\\hspace{0.167em}',
562: 8204 => '\{\}',
563: 'zwnj' => '\{\}',
564: 8205 => '',
565: 'zwj' => '',
566: 8206 => '',
567: 'lrm' => '',
568: 8207 => '',
569: 'rlm' => '',
570: 8211 => '--',
571: 'ndash' => '--',
572: 8212 => '---',
573: 'mdash' => '---',
574: 8216 => '`',
575: 'lsquo' => '`',
576: 8217 => "'",
577: 'rsquo' => "'",
578: 8218 => '\\quotesinglebase',
579: 'sbquo' => '\\quotesinglebase',
580: 8220 => '``',
581: 'ldquo' => '``',
582: 8221 => "''",
583: 'rdquo' => "''",
584: 8222 => '\\quotedblbase',
585: 'bdquo' => '\\quotedblbase',
586: 8224 => '\\dagger',
587: 'dagger' => '\\dagger',
588: '8225' => '\\ddag',
589: 'Dagger' => '\\ddag',
590: 8226 => '\\textbullet',
591: 'bull' => '\\textbullet',
592: 8230 => '\\textellipsis',
593: 'hellep' => '\\textellipsis',
594: 8240 => '\\textperthousand',
595: permil => '\\textperthousand',
596: 8242 => '\\textquotesingle',
597: 'prime' => '\\textquotesingle',
598: 8243 => '\\textquotedbl',
599: 'Prime' => '\\textquotedbl',
600: 8249 => '\\guilsingleleft',
601: 'lsaquo' => '\\guilsingleleft',
602: 8250 => '\\guilsingleright',
603: 'rsaquo' => '\\guilsingleright',
604: 8254 => '\\textasciimacron',
605: oline => '\\textasciimacron',
606: 8260 => '\\textfractionsolidus',
607: 'frasl' => '\\textfractionsolidus',
608: 8364 => '\\texteuro',
609: 'euro' => '\\texteuro',
610:
611: # Letter like symbols
612:
613:
614: 8472 => '\\ensuremath\{\\wp\}',
615: 'weierp' => '\\ensuremath\{\\wp\}',
616: 8465 => '\\ensuremath\{\\Im\}',
617: 'image' => '\\ensuremath\{\\Im\}',
618: 8476 => '\\ensuremath{\\Re\}',
619: 'real' => '\\ensuremath{\\Re\}',
620: 8482 => '\\texttrademark',
621: 'trade' => '\\texttrademark',
622: 8501 => '\\ensuremath{\\aleph\}',
623: 'alefsym'=> '\\ensuremath{\\aleph\}',
624:
625: # Arrows and then some (harpoons from Hon Kie).
626:
627: 8592 => '\\textleftarrow',
628: 'larr' => '\\textleftarrow',
629: 8593 => '\\textuparrow',
630: 'uarr' => '\\textuparrow',
631: 8594 => '\\textrightarrow',
632: 'rarr' => '\\textrightarrow',
633: 8595 => '\\textdownarrow',
634: 'darr' => '\\textdownarrow',
635: 8596 => '\\ensuremath\{\\leftrightarrow\}',
636: 'harr' => '\\ensuremath\{\\leftrightarrow\}',
637: 8598 => '\\ensuremath\{\\nwarrow\}',
638: 8599 => '\\ensuremath\{\\nearrow\}',
639: 8600 => '\\ensuremath\{\\searrow\}',
640: 8601 => '\\ensuremath\{\\swarrow\}',
641: 8605 => '\\ensuremath\{\\leadsto\}',
642: 8614 => '\\ensuremath\{\\mapsto\}',
643: 8617 => '\\ensuremath\{\\hookleftarrow\}',
644: 8618 => '\\ensuremath\{\\hookrightarrow\}',
645: 8629 => '\\ensuremath\{\\hookleftarrow\}', # not an exact match but best I know.
646: 'crarr' => '\\ensuremath\{\\hookleftarrow\}', # not an exact match but best I know.
647: 8636 => '\\ensuremath\{\\leftharpoonup\}',
648: 8637 => '\\ensuremath\{\\leftharpoondown\}',
649: 8640 => '\\ensuremath\{\\rightharpoonup\}',
650: 8641 => '\\ensuremath\{\\rightharpoondown\}',
651: 8652 => '\\ensuremath\{\\rightleftharpoons\}',
652: 8656 => '\\ensuremath\{\\Leftarrow\}',
653: 'lArr' => '\\ensuremath\{\\Leftarrow\}',
654: 8657 => '\\ensuremath\{\\Uparrow\}',
655: 'uArr' => '\\ensuremath\{\\Uparrow\}',
656: 8658 => '\\ensuremath\{\\Rightarrow\}',
657: 'rArr' => '\\ensuremath\{\\Rightarrow\}',
658: 8659 => '\\ensuremath\{\\Downarrow\}',
659: 'dArr' => '\\ensuremath\{\\Downarrow\}',
660: 8660 => '\\ensuremath\{\\Leftrightarrow\}',
661: 'hArr' => '\\ensuremath\{\\Leftrightarrow\}',
662: 8661 => '\\ensuremath\{\\Updownarrow\}',
663: 'vArr' => '\\ensuremath\{\\Updownarrow\}',
664: 8666 => '\\ensuremath\{\\Lleftarrow\}',
665: 'lAarr' => '\\ensuremath\{\\Lleftarrow\}',
666: 8667 => '\\ensuremath\{\\Rrightarrow\}',
667: 'rAarr' => '\\ensuremath\{\\Rrightarrow\}',
668: 8669 => '\\ensuremath\{\\rightsquigarrow\}',
669: 'rarrw' => '\\ensuremath\{\\rightsquigarrow\}',
670:
671:
672: # Mathematical operators.
673:
674:
675: 'forall' => '\\ensuremath\{\\forall\}',
676: 8704 => '\\ensuremath\{\\forall\}',
677: 'comp' => '\\ensuremath\{\\complement\}',
678: 8705 => '\\ensuremath\{\\complement\}',
679: 'part' => '\\ensuremath\{\\partial\}',
680: 8706 => '\\ensuremath\{\\partial\}',
681: 'exist' => '\\ensuremath\{\\exists\}',
682: 8707 => '\\ensuremath\{\\exists\}',
683: 'nexist' => '\\ensuremath\{\\nexists\}',
684: 8708 => '\\ensuremath\{\\nexists\}',
685: 'empty' => '\\ensuremath\{\\emptysset\}',
686: 8709 => '\\ensuremath\{\\emptysset\}',
687: 8710 => '\\ensuremath\{\\Delta\}',
688: 'nabla' => '\\ensuremath\{\\nabla\}',
689: 8711 => '\\ensuremath\{\\nabla\}',
690: 'isin' => '\\ensuremath\{\\in\}',
691: 8712 => '\\ensuremath\{\\in\}',
692: 'notin' => '\\ensuremath\{\\notin\}',
693: 8713 => '\\ensuremath\{\\notin\}',
694: ni => '\\ensuremath\{\\ni\}',
695: 8715 => '\\ensuremath\{\\ni\}',
696: 8716 => '\\ensuremath\{\\not\\ni\}',
697: 'prod' => '\\ensuremath\{\\prod\}',
698: 8719 => '\\ensuremath\{\\prod\}',
699: 8720 => '\\ensuremath\{\\coprod\}',
700: 'sum' => '\\ensuremath\{\\sum\}',
701: 8721 => '\\ensuremath\{\\sum\}',
702: 'minus' => '\\ensuremath\{-\}',
703: 8722 => '\\ensuremath\{-\}',
704: 8723 => '\\ensuremath\{\\mp\}',
705: 8724 => '\\ensuremath\{\\dotplus\}',
706: 8725 => '\\ensuremath\{\\diagup\}',
707: 8726 => '\\ensuremath\{\\smallsetminus\}',
708: 'lowast' => '\\ensuremath\{*\}',
709: 8727 => '\\ensuremath\{*\}',
710: 8728 => '\\ensuremath\{\\circ\}',
711: 8729 => '\\ensuremath\{\\bullet\}',
712: 'radic' => '\\ensuremath\{\\surd\}',
713: 8730 => '\\ensuremath\{\\surd\}',
714: 8731 => '\\ensuremath\{\\sqrt[3]\{\}\}',
715: 8732 => '\\ensuremath\{\\sqrt[4]\{\}\}',
716: 'prop' => '\\ensuremath\{\\propto\}',
717: 8733 => '\\ensuremath\{\\propto\}',
718: 'infin' => '\\ensuremath\{\\infty\}',
719: 8734 => '\\ensuremath\{\\infty\}',
720: 'ang90' => '\\ensuremath\{\\sqangle\}',
721: 8735 => '\\ensuremath\{\\sqangle\}',
722: 'ang' => '\\ensuremath\{\\angle\}',
723: 8736 => '\\ensuremath\{\\angle\}',
724: 'angmsd' => '\\ensuremath\{\\measuredangle\}',
725: 8737 => '\\ensuremath\{\\measuredangle\}',
726: 'angsph' => '\\ensuremath\{\\sphiericalangle\}',
727: 8738 => '\\ensuremath\{\\sphiericalangle\}',
728: 8739 => '\\ensuremath\{\\vert\}',
729: 8740 => '\\ensuremath\{\\Vert\}',
730: 'and' => '\\ensuremath\{\\land\}',
731: 8743 => '\\ensuremath\{\\land\}',
732: 'or' => '\\ensuremath\{\\lor\}',
733: 8744 => '\\ensuremath\{\\lor\}',
734: 'cap' => '\\ensuremath\{\\cap\}',
735: 8745 => '\\ensuremath\{\\cap\}',
736: 'cup' => '\\ensuremath\{\\cup\}',
737: 8746 => '\\ensuremath\{\\cup\}',
738: 'int' => '\\ensuremath\{\\int\}',
739: 8747 => '\\ensuremath\{\\int\}',
740: 'conint' => '\\ensuremath\{\\oint\}',
741: 8750 => '\\ensuremath\{\\oint\}',
742: 'there4' => '\\ensuremath\{\\therefore\}',
743: 8756 => '\\ensuremath\{\\therefore\}',
744: 'becaus' => '\\ensuremath\{\\because\}',
745: 8757 => '\\ensuremath\{\\because\}',
746: 8758 => '\\ensuremath\{:\}',
747: 8759 => '\\ensuremath\{::\}',
748: 'sim' => '\\ensuremath\{\\sim\}',
749: 8764 => '\\ensuremath\{\\sim\}',
750: 8765 => '\\ensuremath\{\\backsim\}',
751: 'wreath' => '\\ensuremath\{\\wr\}',
752: 8768 => '\\ensuremath\{\\wr\}',
753: 'nsim' => '\\ensuremath\{\\not\sim\}',
754: 8769 => '\\ensuremath\{\\not\sim\}',
755: # 'asymp' => '\\ensuremath\{\\asymp\}', ≈ is actually a different glyph.
756: 8771 => '\\ensuremath\{\\asymp\}',
757: 8772 => '\\ensuremath\{\\not\\asymp\}',
758: 'cong' => '\\ensuremath\{\\cong\}',
759: 8773 => '\\ensuremath\{\\cong\}',
760: 8775 => '\\ensuremath\{\\ncong\}',
761: 8778 => '\\ensuremath\{\\approxeq\}',
762: 8784 => '\\ensuremath\{\\doteq\}',
763: 8785 => '\\ensuremath\{\\doteqdot\}',
764: 8786 => '\\ensuremath\{\\fallingdotseq\}',
765: 8787 => '\\ensuremath\{\\risingdotseq\}',
766: 8788 => '\\ensuremath\{:=\}',
767: 8789 => '\\ensuremath\{=:\}',
768: 8790 => '\\ensuremath\{\\eqcirc\}',
769: 8791 => '\\ensuremath\{\\circeq\}',
770: 'wedgeq' => '\\ensuremath\{\\stackrel\{\\wedge\}\{=\}\}',
771: 8792 => '\\ensuremath\{\\stackrel\{\\wedge\}\{=\}\}',
772: 8794 => '\\ensuremath\{\\stackrel\{\\vee\}\{=\}\}',
773: 8795 => '\\ensuremath\{\\stackrel\{\\star}\{=\}\}',
774: 8796 => '\\ensuremath\{\\triangleeq\}',
775: 8797 => '\\ensuremath\{\\stackrel\{def\}\{=\}\}',
776: 8798 => '\\ensuremath\{\\stackrel\{m\}\{=\}\}',
777: 8799 => '\\ensuremath\{\\stackrel\{?\}\{=\}\}',
778: 'ne' => '\\ensuremath\{\\neq\}',
779: 8800 => '\\ensuremath\{\\neq\}',
780: 'equiv' => '\\ensuremath\{\\equiv\}',
781: 8801 => '\\ensuremath\{\\equiv\}',
782: 8802 => '\\ensuremath\{\\not\\equiv\}',
783: 'le' => '\\ensuremath\{\\leq\}',
784: 8804 => '\\ensuremath\{\\leq\}',
785: 'ge' => '\\ensuremath\{\\geq\}',
786: 8805 => '\\ensuremath\{\\geq\}',
787: 8806 => '\\ensuremath\{\\leqq\}',
788: 8807 => '\\ensuremath\{\\geqq\}',
789: 8810 => '\\ensuremath\{\\ll\}',
790: 8811 => '\\ensuremath\{\\gg\}',
791: 'twixt' => '\\ensuremath\{\\between\}',
792: 8812 => '\\ensuremath\{\\between\}',
793: 8813 => '\\ensuremath\{\\not\\asymp\}',
794: 8814 => '\\ensuremath\{\\not<\}',
795: 8815 => '\\ensuremath\{\\not>\}',
796: 8816 => '\\ensuremath\{\\not\\leqslant\}',
797: 8817 => '\\ensuremath\{\\not\\geqslant\}',
798: 8818 => '\\ensuremath\{\\lessim\}',
799: 8819 => '\\ensuremath\{\\gtrsim\}',
800: 8820 => '\\ensuremath\{\\stackrel\{<\}\{>\}\}',
801: 8821 => '\\ensuremath\{\\stackrel\{>\}\{<\}\}',
802: 8826 => '\\ensuremath\{\\prec\}',
803: 8827 => '\\ensuremath\{\\succ\}',
804: 8828 => '\\ensuremath\{\\preceq\}',
805: 8829 => '\\ensuremath\{\\succeq\}',
806: 8830 => '\\ensuremath\{\\not\\prec\}',
807: 8831 => '\\ensuremath\{\\not\\succ\}',
808: 'sub' => '\\ensuremath\{\\subset\}',
809: 8834 => '\\ensuremath\{\\subset\}',
810: 'sup' => '\\ensuremath\{\\supset\}',
811: 8835 => '\\ensuremath\{\\supset\}',
812: 'nsub' => '\\ensuremath\{\\not\\subset\}',
813: 8836 => '\\ensuremath\{\\not\\subset\}',
814: 8837 => '\\ensuremath\{\\not\\supset\}',
815: 'sube' => '\\ensuremath\{\\subseteq\}',
816: 8838 => '\\ensuremath\{\\subseteq\}',
817: 'supe' => '\\ensuermath\{\\supseteq\}',
818: 8839 => '\\ensuermath\{\\supseteq\}',
819: 8840 => '\\ensuremath\{\\nsubseteq\}',
820: 8841 => '\\ensuremath\{\\nsupseteq\}',
821: 8842 => '\\ensuremath\{\\subsetneq\}',
822: 8843 => '\\ensuremath\{\\supsetneq\}',
823: 8847 => '\\ensuremath\{\\sqsubset\}',
824: 8848 => '\\ensuremath\{\\sqsupset\}',
825: 8849 => '\\ensuremath\{\\sqsubseteq\}',
826: 8850 => '\\ensuremath\{\\sqsupseteq\}',
827: 8851 => '\\ensuremath\{\\sqcap\}',
828: 8852 => '\\ensuremath\{\\sqcup\}',
829: 'oplus' => '\\ensuremath\{\\oplus\}',
830: 8853 => '\\ensuremath\{\\oplus\}',
831: 8854 => '\\ensuremath\{\\ominus\}',
832: 'otimes' => '\\ensuremath\{\\otimes\}',
833: 8855 => '\\ensuremath\{\\otimes\}',
834: 8856 => '\\ensuremath\{\\oslash\}',
835: 8857 => '\\ensuremath\{\\odot\}',
836: 8858 => '\\ensuremath\{\\circledcirc\}',
837: 8859 => '\\ensuremath\{\\circledast\}',
838: 8861 => '\\ensuremath\{\\ominus\}', # Close enough for government work.
839: 8862 => '\\ensuremath\{\\boxplus\}',
840: 8863 => '\\ensuremath\{\\boxminus\}',
841: 8864 => '\\ensuremath\{\\boxtimes\}',
842: 8865 => '\\ensuremath\{\\boxdot\}',
843: 'vdash' => '\\ensuremath\{\\vdash\}',
844: 8866 => '\\ensuremath\{\\vdash\}',
845: 'dashv' => '\\ensuremath\{\\dashv\}',
846: 8867 => '\\ensuremath\{\\dashv\}',
847: 'perp' => '\\ensuremath\{\\perp\}',
848: 8869 => '\\ensuremath\{\\perp\}',
849: 8871 => '\\ensuremath\{\\models\}',
850: 8872 => '\\ensuremath\{\\vDash\}',
851: 8873 => '\\ensuremath\{\\Vdash\}',
852: 8874 => '\\ensuremath\{\\Vvdash\}',
853: 8876 => '\\ensuremath\{\\nvdash\}',
854: 8877 => '\\ensuremath\{\\nvDash\}',
855: 8878 => '\\ensuremath\{\\nVdash\}',
856: 8880 => '\\ensuremath\{\\prec\}',
857: 8881 => '\\ensuremath\{\\succ\}',
858: 8882 => '\\ensuremath\{\\vartriangleleft\}',
859: 8883 => '\\ensuremath\{\\vartriangleright\}',
860: 8884 => '\\ensuremath\{\\trianglelefteq\}',
861: 8885 => '\\ensuremath\{\\trianglerighteq\}',
862: 8891 => '\\ensuremath\{\\veebar\}',
863: 8896 => '\\ensuremath\{\\land\}',
864: 8897 => '\\ensuremath\{\\lor\}',
865: 8898 => '\\ensuremath\{\\cap\}',
866: 8899 => '\\ensuremath\{\\cup\}',
867: 8900 => '\\ensuremath\{\\diamond\}',
868: 'sdot' => '\\ensuremath\{\\cdot\}',
869: 8901 => '\\ensuremath\{\\cdot\}',
870: 8902 => '\\ensuremath\{\\star\}',
871: 8903 => '\\ensuremath\{\\divideontimes\}',
872: 8904 => '\\ensuremath\{\\bowtie\}',
873: 8905 => '\\ensuremath\{\\ltimes\}',
874: 8906 => '\\ensuremath\{\\rtimes\}',
875: 8907 => '\\ensuremath\{\\leftthreetimes\}',
876: 8908 => '\\ensuremath\{\\rightthreetimes\}',
877: 8909 => '\\ensuremath\{\\simeq\}',
878: 8910 => '\\ensuremath\{\\curlyvee\}',
879: 8911 => '\\ensuremath\{\\curlywedge\}',
880: 8912 => '\\ensuremath\{\\Subset\}',
881: 8913 => '\\ensuremath\{\\Supset\}',
882: 8914 => '\\ensuremath\{\\Cap\}',
883: 8915 => '\\ensuremath\{\\Cup\}',
884: 8916 => '\\ensuremath\{\\pitchfork\}',
885: 8918 => '\\ensuremath\{\\lessdot\}',
886: 8919 => '\\ensuremath\{\\gtrdot\}',
887: 8920 => '\\ensuremath\{\\lll\}',
888: 8921 => '\\ensuremath\{\\ggg\}',
889: 8922 => '\\ensuremath\{\\gtreqless\}',
890: 8923 => '\\ensuremath\{\\lesseqgtr\}',
891: 8924 => '\\ensuremath\{\\eqslantless\}',
892: 8925 => '\\ensuremath\{\\eqslantgtr\}',
893: 8926 => '\\ensuremath\{\\curlyeqprec\}',
894: 8927 => '\\ensuremath\{\\curlyeqsucc\}',
895: 8928 => '\\ensuremath\{\\not\\preccurlyeq\}',
896: 8929 => '\\ensuremath\{\\not\\succurlyeq\}',
897: 8930 => '\\ensuremath\{\\not\\sqsupseteq\}',
898: 8931 => '\\ensuremath\{\\not\\sqsubseteq\}',
899: 8938 => '\\ensuremath\{\\not\\vartriangleleft\}',
900: 8939 => '\\ensuremath\{\\not\vartriangleright\}',
901: 8940 => '\\ensuremath\{\\not\trianglelefteq\}',
902: 8941 => '\\ensuremath\{\\not\trianglerighteq\}',
903: 8942 => '\\ensuremath\{\\vdots\}',
904: 8960 => '\\ensuremath\{\\varnothing\}',
905: 'lceil' => '\\ensuremath\{\\lceil\}',
906: 8968 => '\\ensuremath\{\\lceil\}',
907: 'rceil' => '\\ensuremath\{\\rceil\}',
908: 8969 => '\\ensuremath\{\\rceil\}',
909: 'lfloor' => '\\ensuremath\{\\lfloor\}',
910: 8970 => '\\ensuremath\{\\lfloor\}',
911: 'rfloor' => '\\ensuremath\{\\rfloor}',
912: 8971 => '\\ensuremath\{\\rfloor}',
913: 'lang' => '\\ensuremath\{\\langle\}',
914: 9001 => '\\ensuremath\{\\langle\}',
915: 'rang' => '\\ensuremath\{\\rangle\}',
916: 9002 => '\\ensuremath\{\\rangle\}',
917: 'loz' => '\\ensuremath\{\\lozenge\}',
918: 9674 => '\\ensuremath\{\\lozenge\}',
919: 'spades' => '\\ensuremath\{\\spadesuit\}',
920: 9824 => '\\ensuremath\{\\spadesuit\}',
921: 9825 => '\\ensuremath\{\\heartsuit\}',
922: 9826 => '\\ensuremath\{\\diamondsuit\}',
923: 'clubs' => '\\ensuremath\{\\clubsuit\}',
924: 9827 => '\\ensuremath\{\\clubsuit\}',
925: 'diams' => '\\ensuremath\{\\blacklozenge\}',
926: 9830 => '\\ensuremath\{\\blacklozenge\}'
927:
928: );
929:
930: #
931: # Convert a numerical entity (that does not exist in our hash)
932: # to its UTF-8 equivalent representation.
933: # This allows us to support, to some extent, any entity for which
934: # dvipdf can find a gylph (given that LaTeX is now UTF-8 clean).
935: #
936: # Parameters:
937: # unicode - The unicode for the character. This is assumed to
938: # be a decimal value
939: # Returns:
940: # The UTF-8 equiavalent of the value.
941: #
942: sub entity_to_utf8 {
943: my ($unicode) = @_;
944:
945: return pack("U", $unicode);
946: }
947:
948:
949: #
950: # Convert an entity to the corresponding LateX if possible.
951: # If not possible, and the entity is numeric,
952: # the entity is treated like a Unicode character and converted
953: # to UTF-8 which should display as long as dvipdf can find the
954: # appropriate glyph.
955: #
956: # The entity is assumed to have already had the
957: # &# ; or & ; removed
958: #
959: # Parameters:
960: # entity - Name of entity to convert.
961: # Returns:
962: # One of the following:
963: # - Latex string that produces the entity.
964: # - UTF-8 equivalent of a numeric entity for which we don't have a latex string.
965: # - ' ' for text entities for which there's no latex equivalent.
966: #
967: sub entity_to_latex {
968: my ($entity) = @_;
969:
970: # Try to look up the entity (text or numeric) in the hash:
971:
972:
973: my $latex = $entities{"$entity"};
974: if (defined $latex) {
975: return $latex;
976: }
977: # If the text is purely numeric we can do the UTF-8 conversion:
978:
979: if ($entity =~ /^\d$/) {
980: return &entity_to_utf8($entity);
981: }
982: # Can't do the conversion`< ...
983:
984: return " ";
985: }
986:
987: #
988: # Convert all the entities in a string.
989: # We locate all the entities, pass them into entity_to_latex and
990: # and replace occurences in the input string.
991: # The assumption is that there are few entities in any string/document
992: # so this looping is not too bad. The advantage of looping vs. regexping is
993: # that we now can use lookup tables for the translation in entity_to_latex above.
994: #
995: # Parameters:
996: # input - Input string/document
997: # Returns
998: # input with entities replaced by latexable stuff (UTF-8 encodings or
999: # latex control strings to produce the entity.
1000: #
1001: #
1002: sub replace_entities {
1003: my ($input) = @_;
1004: my $start;
1005: my $end;
1006: my $entity;
1007: my $latex;
1008:
1009: # First the &#nnn; entities:
1010:
1011: while ($input =~ /(&\#\d+;)/) {
1012: ($start) = @-;
1013: ($end) = @+;
1014: $entity = substr($input, $start+2, $end-$start-3);
1015: $latex = &entity_to_latex($entity);
1016: substr($input, $start, $end-$start) = $latex;
1017: }
1018: # Now the &text; entites;
1019:
1020: while ($input =~/(&\w+;)/) {
1021: ($start) = @-;
1022: ($end) = @+;
1023: $entity = substr($input, $start+1, $end-$start-2);
1024: $latex = &entity_to_latex($entity);
1025: substr($input, $start, $end-$start) = $latex;
1026:
1027: }
1028: return $input;
1029: }
1030:
1031: 1;
1032:
1033: __END__
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