d7482997 |
1 | /* |
2 | * misc.c: miscellaneous useful items |
3 | */ |
4 | |
5 | #include "halibut.h" |
6 | |
7 | struct stackTag { |
8 | void **data; |
9 | int sp; |
10 | int size; |
11 | }; |
12 | |
13 | stack stk_new(void) { |
14 | stack s; |
15 | |
16 | s = mknew(struct stackTag); |
17 | s->sp = 0; |
18 | s->size = 0; |
19 | s->data = NULL; |
20 | |
21 | return s; |
22 | } |
23 | |
24 | void stk_free(stack s) { |
25 | sfree(s->data); |
26 | sfree(s); |
27 | } |
28 | |
29 | void stk_push(stack s, void *item) { |
30 | if (s->size <= s->sp) { |
31 | s->size = s->sp + 32; |
32 | s->data = resize(s->data, s->size); |
33 | } |
34 | s->data[s->sp++] = item; |
35 | } |
36 | |
37 | void *stk_pop(stack s) { |
38 | if (s->sp > 0) |
39 | return s->data[--s->sp]; |
40 | else |
41 | return NULL; |
42 | } |
43 | |
44 | /* |
45 | * Small routines to amalgamate a string from an input source. |
46 | */ |
47 | const rdstring empty_rdstring = {0, 0, NULL}; |
48 | const rdstringc empty_rdstringc = {0, 0, NULL}; |
49 | |
50 | void rdadd(rdstring *rs, wchar_t c) { |
51 | if (rs->pos >= rs->size-1) { |
52 | rs->size = rs->pos + 128; |
53 | rs->text = resize(rs->text, rs->size); |
54 | } |
55 | rs->text[rs->pos++] = c; |
56 | rs->text[rs->pos] = 0; |
57 | } |
58 | void rdadds(rdstring *rs, wchar_t *p) { |
59 | int len = ustrlen(p); |
60 | if (rs->pos >= rs->size - len) { |
61 | rs->size = rs->pos + len + 128; |
62 | rs->text = resize(rs->text, rs->size); |
63 | } |
64 | ustrcpy(rs->text + rs->pos, p); |
65 | rs->pos += len; |
66 | } |
67 | wchar_t *rdtrim(rdstring *rs) { |
68 | rs->text = resize(rs->text, rs->pos + 1); |
69 | return rs->text; |
70 | } |
71 | |
72 | void rdaddc(rdstringc *rs, char c) { |
73 | if (rs->pos >= rs->size-1) { |
74 | rs->size = rs->pos + 128; |
75 | rs->text = resize(rs->text, rs->size); |
76 | } |
77 | rs->text[rs->pos++] = c; |
78 | rs->text[rs->pos] = 0; |
79 | } |
80 | void rdaddsc(rdstringc *rs, char *p) { |
81 | int len = strlen(p); |
82 | if (rs->pos >= rs->size - len) { |
83 | rs->size = rs->pos + len + 128; |
84 | rs->text = resize(rs->text, rs->size); |
85 | } |
86 | strcpy(rs->text + rs->pos, p); |
87 | rs->pos += len; |
88 | } |
89 | char *rdtrimc(rdstringc *rs) { |
90 | rs->text = resize(rs->text, rs->pos + 1); |
91 | return rs->text; |
92 | } |
93 | |
94 | int compare_wordlists(word *a, word *b) { |
95 | int t; |
96 | while (a && b) { |
97 | if (a->type != b->type) |
98 | return (a->type < b->type ? -1 : +1); /* FIXME? */ |
99 | t = a->type; |
100 | if ((t != word_Normal && t != word_Code && |
101 | t != word_WeakCode && t != word_Emph) || |
102 | a->alt || b->alt) { |
103 | int c; |
104 | if (a->text && b->text) { |
105 | c = ustricmp(a->text, b->text); |
106 | if (c) |
107 | return c; |
108 | } |
109 | c = compare_wordlists(a->alt, b->alt); |
110 | if (c) |
111 | return c; |
112 | a = a->next; |
113 | b = b->next; |
114 | } else { |
115 | wchar_t *ap = a->text, *bp = b->text; |
116 | while (*ap && *bp) { |
117 | wchar_t ac = utolower(*ap), bc = utolower(*bp); |
118 | if (ac != bc) |
119 | return (ac < bc ? -1 : +1); |
120 | if (!*++ap && a->next && a->next->type == t && !a->next->alt) |
121 | a = a->next, ap = a->text; |
122 | if (!*++bp && b->next && b->next->type == t && !b->next->alt) |
123 | b = b->next, bp = b->text; |
124 | } |
125 | if (*ap || *bp) |
126 | return (*ap ? +1 : -1); |
127 | a = a->next; |
128 | b = b->next; |
129 | } |
130 | } |
131 | |
132 | if (a || b) |
133 | return (a ? +1 : -1); |
134 | else |
135 | return 0; |
136 | } |
137 | |
138 | void mark_attr_ends(paragraph *sourceform) { |
139 | paragraph *p; |
140 | word *w, *wp; |
141 | for (p = sourceform; p; p = p->next) { |
142 | wp = NULL; |
143 | for (w = p->words; w; w = w->next) { |
144 | if (isattr(w->type)) { |
145 | int before = (wp && isattr(wp->type) && |
146 | sameattr(wp->type, w->type)); |
147 | int after = (w->next && isattr(w->next->type) && |
148 | sameattr(w->next->type, w->type)); |
149 | w->aux |= (before ? |
150 | (after ? attr_Always : attr_Last) : |
151 | (after ? attr_First : attr_Only)); |
152 | } |
153 | wp = w; |
154 | } |
155 | } |
156 | } |
157 | |
158 | wrappedline *wrap_para(word *text, int width, int subsequentwidth, |
159 | int (*widthfn)(word *)) { |
160 | wrappedline *head = NULL, **ptr = &head; |
161 | int nwords, wordsize; |
162 | struct wrapword { |
163 | word *begin, *end; |
164 | int width; |
165 | int spacewidth; |
166 | int cost; |
167 | int nwords; |
168 | } *wrapwords; |
169 | int i, j, n; |
170 | |
171 | /* |
172 | * Break the line up into wrappable components. |
173 | */ |
174 | nwords = wordsize = 0; |
175 | wrapwords = NULL; |
176 | while (text) { |
177 | if (nwords >= wordsize) { |
178 | wordsize = nwords + 64; |
179 | wrapwords = srealloc(wrapwords, wordsize * sizeof(*wrapwords)); |
180 | } |
181 | wrapwords[nwords].width = 0; |
182 | wrapwords[nwords].begin = text; |
183 | while (text) { |
184 | wrapwords[nwords].width += widthfn(text); |
185 | wrapwords[nwords].end = text->next; |
186 | if (text->next && (text->next->type == word_WhiteSpace || |
187 | text->next->type == word_EmphSpace || |
188 | text->breaks)) |
189 | break; |
190 | text = text->next; |
191 | } |
192 | if (text && text->next && (text->next->type == word_WhiteSpace || |
193 | text->next->type == word_EmphSpace)) { |
194 | wrapwords[nwords].spacewidth = widthfn(text->next); |
195 | text = text->next; |
196 | } else { |
197 | wrapwords[nwords].spacewidth = 0; |
198 | } |
199 | nwords++; |
200 | if (text) |
201 | text = text->next; |
202 | } |
203 | |
204 | /* |
205 | * Perform the dynamic wrapping algorithm: work backwards from |
206 | * nwords-1, determining the optimal wrapping for each terminal |
207 | * subsequence of the paragraph. |
208 | */ |
209 | for (i = nwords; i-- ;) { |
210 | int best = -1; |
211 | int bestcost = 0; |
212 | int cost; |
213 | int linelen = 0, spacewidth = 0; |
214 | int seenspace; |
215 | int thiswidth = (i == 0 ? width : subsequentwidth); |
216 | |
217 | j = 0; |
218 | seenspace = 0; |
219 | while (i+j < nwords) { |
220 | /* |
221 | * See what happens if we put j+1 words on this line. |
222 | */ |
223 | if (spacewidth) |
224 | seenspace = 1; |
225 | linelen += spacewidth + wrapwords[i+j].width; |
226 | spacewidth = wrapwords[i+j].spacewidth; |
227 | j++; |
228 | if (linelen > thiswidth) { |
229 | /* |
230 | * If we're over the width limit, abandon ship, |
231 | * _unless_ there is no best-effort yet (which will |
232 | * only happen if the first word is too long all by |
233 | * itself). |
234 | */ |
235 | if (best > 0) |
236 | break; |
237 | } |
238 | if (i+j == nwords) { |
239 | /* |
240 | * Special case: if we're at the very end of the |
241 | * paragraph, we don't score penalty points for the |
242 | * white space left on the line. |
243 | */ |
244 | cost = 0; |
245 | } else { |
246 | cost = (thiswidth-linelen) * (thiswidth-linelen); |
247 | cost += wrapwords[i+j].cost; |
248 | } |
249 | /* |
250 | * We compare bestcost >= cost, not bestcost > cost, |
251 | * because in cases where the costs are identical we |
252 | * want to try to look like the greedy algorithm, |
253 | * because readers are likely to have spent a lot of |
254 | * time looking at greedy-wrapped paragraphs and |
255 | * there's no point violating the Principle of Least |
256 | * Surprise if it doesn't actually gain anything. |
257 | */ |
258 | if (best < 0 || bestcost >= cost) { |
259 | bestcost = cost; |
260 | best = j; |
261 | } |
262 | } |
263 | /* |
264 | * Now we know the optimal answer for this terminal |
265 | * subsequence, so put it in wrapwords. |
266 | */ |
267 | wrapwords[i].cost = bestcost; |
268 | wrapwords[i].nwords = best; |
269 | } |
270 | |
271 | /* |
272 | * We've wrapped the paragraph. Now build the output |
273 | * `wrappedline' list. |
274 | */ |
275 | i = 0; |
276 | while (i < nwords) { |
277 | wrappedline *w = mknew(wrappedline); |
278 | *ptr = w; |
279 | ptr = &w->next; |
280 | w->next = NULL; |
281 | |
282 | n = wrapwords[i].nwords; |
283 | w->begin = wrapwords[i].begin; |
284 | w->end = wrapwords[i+n-1].end; |
285 | |
286 | /* |
287 | * Count along the words to find nspaces and shortfall. |
288 | */ |
289 | w->nspaces = 0; |
290 | w->shortfall = width; |
291 | for (j = 0; j < n; j++) { |
292 | w->shortfall -= wrapwords[i+j].width; |
293 | if (j < n-1 && wrapwords[i+j].spacewidth) { |
294 | w->nspaces++; |
295 | w->shortfall -= wrapwords[i+j].spacewidth; |
296 | } |
297 | } |
298 | i += n; |
299 | } |
300 | |
301 | sfree(wrapwords); |
302 | |
303 | return head; |
304 | } |
305 | |
306 | void wrap_free(wrappedline *w) { |
307 | while (w) { |
308 | wrappedline *t = w->next; |
309 | sfree(w); |
310 | w = t; |
311 | } |
312 | } |