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0fc6e47b KB |
1 | /*- |
2 | * Copyright (c) 1980 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
252367af | 6 | */ |
3279b357 | 7 | |
72fbef68 | 8 | #ifndef lint |
0fc6e47b KB |
9 | static char sccsid[] = "@(#)yylex.c 5.2 (Berkeley) %G%"; |
10 | #endif /* not lint */ | |
3279b357 PK |
11 | |
12 | #include "whoami.h" | |
13 | #include "0.h" | |
72fbef68 | 14 | #include "tree_ty.h" /* must be included for yy.h */ |
3279b357 PK |
15 | #include "yy.h" |
16 | ||
17 | /* | |
18 | * Scanner | |
19 | */ | |
20 | int yylacnt; | |
21 | ||
22 | #define YYLASIZ 10 | |
23 | ||
24 | struct yytok Yla[YYLASIZ]; | |
25 | ||
26 | unyylex(y) | |
72fbef68 | 27 | struct yytok *y; |
3279b357 PK |
28 | { |
29 | ||
30 | if (yylacnt == YYLASIZ) | |
31 | panic("unyylex"); | |
72fbef68 | 32 | copy((char *) &Yla[yylacnt], (char *) y, sizeof Yla[0]); |
3279b357 PK |
33 | yylacnt++; |
34 | ||
35 | } | |
36 | ||
37 | yylex() | |
38 | { | |
39 | register c; | |
72fbef68 | 40 | register int **ip; |
3279b357 PK |
41 | register char *cp; |
42 | int f; | |
43 | char delim; | |
44 | ||
45 | if (yylacnt != 0) { | |
46 | yylacnt--; | |
72fbef68 | 47 | copy((char *) &Y, (char *) &Yla[yylacnt], sizeof Y); |
3279b357 PK |
48 | return (yychar); |
49 | } | |
50 | if (c = yysavc) | |
51 | yysavc = 0; | |
52 | else | |
53 | c = readch(); | |
54 | #ifdef PXP | |
55 | yytokcnt++; | |
56 | #endif | |
57 | ||
58 | next: | |
59 | /* | |
60 | * skip white space | |
61 | */ | |
62 | #ifdef PXP | |
63 | yywhcnt = 0; | |
64 | #endif | |
65 | while (c == ' ' || c == '\t') { | |
66 | #ifdef PXP | |
67 | if (c == '\t') | |
68 | yywhcnt++; | |
69 | yywhcnt++; | |
70 | #endif | |
71 | c = readch(); | |
72 | } | |
73 | yyecol = yycol; | |
74 | yyeline = yyline; | |
75 | yyefile = filename; | |
76 | yyeseqid = yyseqid; | |
77 | yyseekp = yylinpt; | |
78 | cp = token; | |
79 | yylval = yyline; | |
80 | switch (c) { | |
81 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': | |
82 | case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n': | |
83 | case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u': | |
84 | case 'v': case 'w': case 'x': case 'y': case 'z': | |
85 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': | |
86 | case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': | |
87 | case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U': | |
88 | case 'V': case 'W': case 'X': case 'Y': case 'Z': | |
89 | do { | |
90 | *cp++ = c; | |
91 | c = readch(); | |
92 | } while (alph(c) || digit(c)); | |
93 | *cp = 0; | |
94 | if (opt('s')) | |
95 | for (cp = token; *cp; cp++) | |
96 | if (*cp >= 'A' && *cp <= 'Z') { | |
6cbd3a07 | 97 | *cp |= ' '; |
3279b357 PK |
98 | } |
99 | yysavc = c; | |
72fbef68 RT |
100 | ip = (int **) hash((char *) 0, 1); |
101 | if (*ip < (int *) yykey || *ip >= (int *) lastkey) { | |
102 | yylval = (int) *ip; | |
3279b357 PK |
103 | return (YID); |
104 | } | |
105 | yylval = yyline; | |
106 | /* | |
107 | * For keywords | |
108 | * the lexical token | |
109 | * is magically retrieved | |
110 | * from the keyword table. | |
111 | */ | |
112 | return ((*ip)[1]); | |
113 | case '0': case '1': case '2': case '3': case '4': | |
114 | case '5': case '6': case '7': case '8': case '9': | |
115 | f = 0; | |
116 | do { | |
117 | *cp++ = c; | |
118 | c = readch(); | |
119 | } while (digit(c)); | |
120 | if (c == 'b' || c == 'B') { | |
121 | /* | |
122 | * nonstandard - octal constants | |
123 | */ | |
124 | if (opt('s')) { | |
125 | standard(); | |
126 | yerror("Octal constants are non-standard"); | |
127 | } | |
128 | *cp = 0; | |
129 | yylval = copystr(token); | |
130 | return (YBINT); | |
131 | } | |
132 | if (c == '.') { | |
133 | c = readch(); | |
134 | if (c == '.') { | |
135 | *cp = 0; | |
136 | yysavc = YDOTDOT; | |
137 | yylval = copystr(token); | |
138 | return (YINT); | |
139 | } | |
140 | infpnumb: | |
141 | f++; | |
142 | *cp++ = '.'; | |
143 | if (!digit(c)) { | |
144 | yyset(); | |
145 | recovered(); | |
146 | yerror("Digits required after decimal point"); | |
147 | *cp++ = '0'; | |
148 | } else | |
149 | while (digit(c)) { | |
150 | *cp++ = c; | |
151 | c = readch(); | |
152 | } | |
153 | } | |
154 | if (c == 'e' || c == 'E') { | |
155 | f++; | |
156 | *cp++ = c; | |
157 | if ((c = yysavc) == 0) | |
158 | c = readch(); | |
159 | if (c == '+' || c == '-') { | |
160 | *cp++ = c; | |
161 | c = readch(); | |
162 | } | |
163 | if (!digit(c)) { | |
164 | yyset(); | |
165 | yerror("Digits required in exponent"); | |
166 | *cp++ = '0'; | |
167 | } else | |
168 | while (digit(c)) { | |
169 | *cp++ = c; | |
170 | c = readch(); | |
171 | } | |
172 | } | |
173 | *cp = 0; | |
174 | yysavc = c; | |
175 | yylval = copystr(token); | |
176 | if (f) | |
177 | return (YNUMB); | |
178 | return (YINT); | |
179 | case '"': | |
180 | case '`': | |
eb936799 | 181 | case '#': |
3279b357 PK |
182 | if (!any(bufp + 1, c)) |
183 | goto illch; | |
184 | if (!dquote) { | |
185 | recovered(); | |
186 | dquote++; | |
187 | yerror("Character/string delimiter is '"); | |
188 | } | |
189 | case '\'': | |
3279b357 PK |
190 | delim = c; |
191 | do { | |
192 | do { | |
193 | c = readch(); | |
194 | if (c == '\n') { | |
72fbef68 | 195 | yerror("Unmatched %c for string", (char *) delim); |
3279b357 PK |
196 | if (cp == token) |
197 | *cp++ = ' ', cp++; | |
198 | break; | |
199 | } | |
200 | *cp++ = c; | |
201 | } while (c != delim); | |
202 | c = readch(); | |
203 | } while (c == delim); | |
204 | *--cp = 0; | |
205 | if (cp == token) { | |
206 | yerror("Null string not allowed"); | |
207 | *cp++ = ' '; | |
208 | *cp++ = 0; | |
209 | } | |
210 | yysavc = c; | |
211 | yylval = copystr(token); | |
212 | return (YSTRING); | |
213 | case '.': | |
214 | c = readch(); | |
215 | if (c == '.') | |
216 | return (YDOTDOT); | |
217 | if (digit(c)) { | |
218 | recovered(); | |
219 | yerror("Digits required before decimal point"); | |
220 | *cp++ = '0'; | |
221 | goto infpnumb; | |
222 | } | |
223 | yysavc = c; | |
224 | return ('.'); | |
225 | case '{': | |
226 | /* | |
227 | * { ... } comment | |
228 | */ | |
229 | #ifdef PXP | |
230 | getcm(c); | |
231 | #endif | |
232 | #ifdef PI | |
233 | c = options(); | |
234 | while (c != '}') { | |
235 | if (c <= 0) | |
236 | goto nonterm; | |
237 | if (c == '{') { | |
238 | warning(); | |
239 | yyset(); | |
240 | yerror("{ in a { ... } comment"); | |
241 | } | |
242 | c = readch(); | |
243 | } | |
244 | #endif | |
245 | c = readch(); | |
246 | goto next; | |
247 | case '(': | |
248 | if ((c = readch()) == '*') { | |
249 | /* | |
250 | * (* ... *) comment | |
251 | */ | |
252 | #ifdef PXP | |
253 | getcm(c); | |
254 | c = readch(); | |
255 | goto next; | |
256 | #endif | |
257 | #ifdef PI | |
258 | c = options(); | |
259 | for (;;) { | |
260 | if (c < 0) { | |
261 | nonterm: | |
262 | yerror("Comment does not terminate - QUIT"); | |
263 | pexit(ERRS); | |
264 | } | |
265 | if (c == '(' && (c = readch()) == '*') { | |
266 | warning(); | |
267 | yyset(); | |
268 | yerror("(* in a (* ... *) comment"); | |
269 | } | |
270 | if (c == '*') { | |
271 | if ((c = readch()) != ')') | |
272 | continue; | |
273 | c = readch(); | |
274 | goto next; | |
275 | } | |
276 | c = readch(); | |
277 | } | |
278 | #endif | |
279 | } | |
280 | yysavc = c; | |
281 | c = '('; | |
282 | case ';': | |
283 | case ',': | |
284 | case ':': | |
285 | case '=': | |
286 | case '*': | |
287 | case '+': | |
288 | case '/': | |
289 | case '-': | |
3279b357 PK |
290 | case ')': |
291 | case '[': | |
292 | case ']': | |
293 | case '<': | |
294 | case '>': | |
3279b357 PK |
295 | case '^': |
296 | return (c); | |
eb936799 PK |
297 | case '~': |
298 | case '|': | |
299 | case '&': | |
300 | if ( opt('s') ) { | |
301 | yyset(); | |
302 | standard(); | |
72fbef68 | 303 | yerror("%c is non-standard", (char *) c); |
eb936799 PK |
304 | } |
305 | return c; | |
3279b357 PK |
306 | default: |
307 | switch (c) { | |
308 | case YDOTDOT: | |
309 | return (c); | |
310 | case '\n': | |
311 | c = readch(); | |
312 | #ifdef PXP | |
313 | yytokcnt++; | |
314 | #endif | |
315 | goto next; | |
316 | case '\f': | |
317 | c = readch(); | |
318 | goto next; | |
319 | } | |
320 | if (c <= 0) | |
321 | return (YEOF); | |
322 | illch: | |
323 | do | |
324 | yysavc = readch(); | |
325 | while (yysavc == c); | |
326 | yylval = c; | |
327 | return (YILLCH); | |
328 | } | |
329 | } | |
330 | ||
331 | yyset() | |
332 | { | |
333 | ||
334 | yyecol = yycol; | |
335 | yyeline = yyline; | |
336 | yyefile = filename; | |
337 | yyseekp = yylinpt; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Setuflg trims the current | |
342 | * input line to at most 72 chars | |
343 | * for the u option. | |
344 | */ | |
345 | setuflg() | |
346 | { | |
347 | ||
348 | if (charbuf[71] != '\n') { | |
349 | charbuf[72] = '\n'; | |
350 | charbuf[73] = 0; | |
351 | } | |
352 | } |