Commit | Line | Data |
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3279b357 PK |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | ||
31cef89c | 3 | static char sccsid[] = "@(#)yylex.c 1.1 8/27/80"; |
3279b357 PK |
4 | |
5 | #include "whoami.h" | |
6 | #include "0.h" | |
7 | #include "yy.h" | |
8 | ||
9 | /* | |
10 | * Scanner | |
11 | */ | |
12 | int yylacnt; | |
13 | ||
14 | #define YYLASIZ 10 | |
15 | ||
16 | struct yytok Yla[YYLASIZ]; | |
17 | ||
18 | unyylex(y) | |
19 | struct yylex *y; | |
20 | { | |
21 | ||
22 | if (yylacnt == YYLASIZ) | |
23 | panic("unyylex"); | |
24 | copy(&Yla[yylacnt], y, sizeof Yla[0]); | |
25 | yylacnt++; | |
26 | ||
27 | } | |
28 | ||
29 | yylex() | |
30 | { | |
31 | register c; | |
32 | register **ip; | |
33 | register char *cp; | |
34 | int f; | |
35 | char delim; | |
36 | ||
37 | if (yylacnt != 0) { | |
38 | yylacnt--; | |
39 | copy(&Y, &Yla[yylacnt], sizeof Y); | |
40 | return (yychar); | |
41 | } | |
42 | if (c = yysavc) | |
43 | yysavc = 0; | |
44 | else | |
45 | c = readch(); | |
46 | #ifdef PXP | |
47 | yytokcnt++; | |
48 | #endif | |
49 | ||
50 | next: | |
51 | /* | |
52 | * skip white space | |
53 | */ | |
54 | #ifdef PXP | |
55 | yywhcnt = 0; | |
56 | #endif | |
57 | while (c == ' ' || c == '\t') { | |
58 | #ifdef PXP | |
59 | if (c == '\t') | |
60 | yywhcnt++; | |
61 | yywhcnt++; | |
62 | #endif | |
63 | c = readch(); | |
64 | } | |
65 | yyecol = yycol; | |
66 | yyeline = yyline; | |
67 | yyefile = filename; | |
68 | yyeseqid = yyseqid; | |
69 | yyseekp = yylinpt; | |
70 | cp = token; | |
71 | yylval = yyline; | |
72 | switch (c) { | |
73 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': | |
74 | case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n': | |
75 | case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u': | |
76 | case 'v': case 'w': case 'x': case 'y': case 'z': | |
77 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': | |
78 | case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': | |
79 | case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U': | |
80 | case 'V': case 'W': case 'X': case 'Y': case 'Z': | |
81 | do { | |
82 | *cp++ = c; | |
83 | c = readch(); | |
84 | } while (alph(c) || digit(c)); | |
85 | *cp = 0; | |
86 | if (opt('s')) | |
87 | for (cp = token; *cp; cp++) | |
88 | if (*cp >= 'A' && *cp <= 'Z') { | |
89 | *cp =| ' '; | |
90 | } | |
91 | yysavc = c; | |
92 | ip = hash(0, 1); | |
93 | if (*ip < yykey || *ip >= lastkey) { | |
94 | yylval = *ip; | |
95 | return (YID); | |
96 | } | |
97 | yylval = yyline; | |
98 | /* | |
99 | * For keywords | |
100 | * the lexical token | |
101 | * is magically retrieved | |
102 | * from the keyword table. | |
103 | */ | |
104 | return ((*ip)[1]); | |
105 | case '0': case '1': case '2': case '3': case '4': | |
106 | case '5': case '6': case '7': case '8': case '9': | |
107 | f = 0; | |
108 | do { | |
109 | *cp++ = c; | |
110 | c = readch(); | |
111 | } while (digit(c)); | |
112 | if (c == 'b' || c == 'B') { | |
113 | /* | |
114 | * nonstandard - octal constants | |
115 | */ | |
116 | if (opt('s')) { | |
117 | standard(); | |
118 | yerror("Octal constants are non-standard"); | |
119 | } | |
120 | *cp = 0; | |
121 | yylval = copystr(token); | |
122 | return (YBINT); | |
123 | } | |
124 | if (c == '.') { | |
125 | c = readch(); | |
126 | if (c == '.') { | |
127 | *cp = 0; | |
128 | yysavc = YDOTDOT; | |
129 | yylval = copystr(token); | |
130 | return (YINT); | |
131 | } | |
132 | infpnumb: | |
133 | f++; | |
134 | *cp++ = '.'; | |
135 | if (!digit(c)) { | |
136 | yyset(); | |
137 | recovered(); | |
138 | yerror("Digits required after decimal point"); | |
139 | *cp++ = '0'; | |
140 | } else | |
141 | while (digit(c)) { | |
142 | *cp++ = c; | |
143 | c = readch(); | |
144 | } | |
145 | } | |
146 | if (c == 'e' || c == 'E') { | |
147 | f++; | |
148 | *cp++ = c; | |
149 | if ((c = yysavc) == 0) | |
150 | c = readch(); | |
151 | if (c == '+' || c == '-') { | |
152 | *cp++ = c; | |
153 | c = readch(); | |
154 | } | |
155 | if (!digit(c)) { | |
156 | yyset(); | |
157 | yerror("Digits required in exponent"); | |
158 | *cp++ = '0'; | |
159 | } else | |
160 | while (digit(c)) { | |
161 | *cp++ = c; | |
162 | c = readch(); | |
163 | } | |
164 | } | |
165 | *cp = 0; | |
166 | yysavc = c; | |
167 | yylval = copystr(token); | |
168 | if (f) | |
169 | return (YNUMB); | |
170 | return (YINT); | |
171 | case '"': | |
172 | case '`': | |
173 | if (!any(bufp + 1, c)) | |
174 | goto illch; | |
175 | if (!dquote) { | |
176 | recovered(); | |
177 | dquote++; | |
178 | yerror("Character/string delimiter is '"); | |
179 | } | |
180 | case '\'': | |
181 | case '#': | |
182 | delim = c; | |
183 | do { | |
184 | do { | |
185 | c = readch(); | |
186 | if (c == '\n') { | |
187 | yerror("Unmatched %c for string", delim); | |
188 | if (cp == token) | |
189 | *cp++ = ' ', cp++; | |
190 | break; | |
191 | } | |
192 | *cp++ = c; | |
193 | } while (c != delim); | |
194 | c = readch(); | |
195 | } while (c == delim); | |
196 | *--cp = 0; | |
197 | if (cp == token) { | |
198 | yerror("Null string not allowed"); | |
199 | *cp++ = ' '; | |
200 | *cp++ = 0; | |
201 | } | |
202 | yysavc = c; | |
203 | yylval = copystr(token); | |
204 | return (YSTRING); | |
205 | case '.': | |
206 | c = readch(); | |
207 | if (c == '.') | |
208 | return (YDOTDOT); | |
209 | if (digit(c)) { | |
210 | recovered(); | |
211 | yerror("Digits required before decimal point"); | |
212 | *cp++ = '0'; | |
213 | goto infpnumb; | |
214 | } | |
215 | yysavc = c; | |
216 | return ('.'); | |
217 | case '{': | |
218 | /* | |
219 | * { ... } comment | |
220 | */ | |
221 | #ifdef PXP | |
222 | getcm(c); | |
223 | #endif | |
224 | #ifdef PI | |
225 | c = options(); | |
226 | while (c != '}') { | |
227 | if (c <= 0) | |
228 | goto nonterm; | |
229 | if (c == '{') { | |
230 | warning(); | |
231 | yyset(); | |
232 | yerror("{ in a { ... } comment"); | |
233 | } | |
234 | c = readch(); | |
235 | } | |
236 | #endif | |
237 | c = readch(); | |
238 | goto next; | |
239 | case '(': | |
240 | if ((c = readch()) == '*') { | |
241 | /* | |
242 | * (* ... *) comment | |
243 | */ | |
244 | #ifdef PXP | |
245 | getcm(c); | |
246 | c = readch(); | |
247 | goto next; | |
248 | #endif | |
249 | #ifdef PI | |
250 | c = options(); | |
251 | for (;;) { | |
252 | if (c < 0) { | |
253 | nonterm: | |
254 | yerror("Comment does not terminate - QUIT"); | |
255 | pexit(ERRS); | |
256 | } | |
257 | if (c == '(' && (c = readch()) == '*') { | |
258 | warning(); | |
259 | yyset(); | |
260 | yerror("(* in a (* ... *) comment"); | |
261 | } | |
262 | if (c == '*') { | |
263 | if ((c = readch()) != ')') | |
264 | continue; | |
265 | c = readch(); | |
266 | goto next; | |
267 | } | |
268 | c = readch(); | |
269 | } | |
270 | #endif | |
271 | } | |
272 | yysavc = c; | |
273 | c = '('; | |
274 | case ';': | |
275 | case ',': | |
276 | case ':': | |
277 | case '=': | |
278 | case '*': | |
279 | case '+': | |
280 | case '/': | |
281 | case '-': | |
282 | case '|': | |
283 | case '&': | |
284 | case ')': | |
285 | case '[': | |
286 | case ']': | |
287 | case '<': | |
288 | case '>': | |
289 | case '~': | |
290 | case '^': | |
291 | return (c); | |
292 | default: | |
293 | switch (c) { | |
294 | case YDOTDOT: | |
295 | return (c); | |
296 | case '\n': | |
297 | c = readch(); | |
298 | #ifdef PXP | |
299 | yytokcnt++; | |
300 | #endif | |
301 | goto next; | |
302 | case '\f': | |
303 | c = readch(); | |
304 | goto next; | |
305 | } | |
306 | if (c <= 0) | |
307 | return (YEOF); | |
308 | illch: | |
309 | do | |
310 | yysavc = readch(); | |
311 | while (yysavc == c); | |
312 | yylval = c; | |
313 | return (YILLCH); | |
314 | } | |
315 | } | |
316 | ||
317 | yyset() | |
318 | { | |
319 | ||
320 | yyecol = yycol; | |
321 | yyeline = yyline; | |
322 | yyefile = filename; | |
323 | yyseekp = yylinpt; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Setuflg trims the current | |
328 | * input line to at most 72 chars | |
329 | * for the u option. | |
330 | */ | |
331 | setuflg() | |
332 | { | |
333 | ||
334 | if (charbuf[71] != '\n') { | |
335 | charbuf[72] = '\n'; | |
336 | charbuf[73] = 0; | |
337 | } | |
338 | } |