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---|---|---|---|---|
1 | /* | |||
2 | ** $Id: llex.c $ | |||
3 | ** Lexical Analyzer | |||
4 | ** See Copyright Notice in lua.h | |||
5 | */ | |||
6 | ||||
7 | #define llex_c | |||
8 | #define LUA_CORE | |||
9 | ||||
10 | #include "lprefix.h" | |||
11 | ||||
12 | ||||
13 | #include <locale.h> | |||
14 | #include <string.h> | |||
15 | ||||
16 | #include "lua.h" | |||
17 | ||||
18 | #include "lctype.h" | |||
19 | #include "ldebug.h" | |||
20 | #include "ldo.h" | |||
21 | #include "lgc.h" | |||
22 | #include "llex.h" | |||
23 | #include "lobject.h" | |||
24 | #include "lparser.h" | |||
25 | #include "lstate.h" | |||
26 | #include "lstring.h" | |||
27 | #include "ltable.h" | |||
28 | #include "lzio.h" | |||
29 | ||||
30 | ||||
31 | ||||
32 | #define next(ls) (ls->current = zgetc(ls->z)) | |||
33 | ||||
34 | ||||
35 | ||||
36 | #define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r') | |||
37 | ||||
38 | ||||
39 | /* ORDER RESERVED */ | |||
40 | static const char *const luaX_tokens [] = { | |||
41 | "and", "break", "do", "else", "elseif", | |||
42 | "end", "false", "for", "function", "goto", "if", | |||
43 | "in", "local", "nil", "not", "or", "repeat", | |||
44 | "return", "then", "true", "until", "while", | |||
45 | "//", "..", "...", "==", ">=", "<=", "~=", | |||
46 | "<<", ">>", "::", "<eof>", | |||
47 | "<number>", "<integer>", "<name>", "<string>" | |||
48 | }; | |||
49 | ||||
50 | ||||
51 | #define save_and_next(ls) (save(ls, ls->current), next(ls)) | |||
52 | ||||
53 | ||||
54 | static l_noret lexerror (LexState *ls, const char *msg, int token); | |||
55 | ||||
56 | ||||
57 | 40591 | static void save (LexState *ls, int c) { | ||
58 | 40591 | Mbuffer *b = ls->buff; | ||
59 |
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40591 | if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) { |
60 | size_t newsize; | |||
61 | ✗ | if (luaZ_sizebuffer(b) >= MAX_SIZE/2) | ||
62 | ✗ | lexerror(ls, "lexical element too long", 0); | ||
63 | ✗ | newsize = luaZ_sizebuffer(b) * 2; | ||
64 | ✗ | luaZ_resizebuffer(ls->L, b, newsize); | ||
65 | } | |||
66 | 40591 | b->buffer[luaZ_bufflen(b)++] = cast_char(c); | ||
67 | 40591 | } | ||
68 | ||||
69 | ||||
70 | 309 | void luaX_init (lua_State *L) { | ||
71 | int i; | |||
72 | 309 | TString *e = luaS_newliteral(L, LUA_ENV); /* create env name */ | ||
73 | 309 | luaC_fix(L, obj2gco(e)); /* never collect this name */ | ||
74 |
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7107 | for (i=0; i<NUM_RESERVED; i++) { |
75 | 6798 | TString *ts = luaS_new(L, luaX_tokens[i]); | ||
76 | 6798 | luaC_fix(L, obj2gco(ts)); /* reserved words are never collected */ | ||
77 | 6798 | ts->extra = cast_byte(i+1); /* reserved word */ | ||
78 | } | |||
79 | 309 | } | ||
80 | ||||
81 | ||||
82 | 1 | const char *luaX_token2str (LexState *ls, int token) { | ||
83 |
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1 | if (token < FIRST_RESERVED) { /* single-byte symbols? */ |
84 | ✗ | if (lisprint(token)) | ||
85 | ✗ | return luaO_pushfstring(ls->L, "'%c'", token); | ||
86 | else /* control character */ | |||
87 | ✗ | return luaO_pushfstring(ls->L, "'<\\%d>'", token); | ||
88 | } | |||
89 | else { | |||
90 | 1 | const char *s = luaX_tokens[token - FIRST_RESERVED]; | ||
91 |
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1 | if (token < TK_EOS) /* fixed format (symbols and reserved words)? */ |
92 | ✗ | return luaO_pushfstring(ls->L, "'%s'", s); | ||
93 | else /* names, strings, and numerals */ | |||
94 | 1 | return s; | ||
95 | } | |||
96 | } | |||
97 | ||||
98 | ||||
99 | 1 | static const char *txtToken (LexState *ls, int token) { | ||
100 |
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1 | switch (token) { | |
101 | ✗ | case TK_NAME: case TK_STRING: | ||
102 | case TK_FLT: case TK_INT: | |||
103 | ✗ | save(ls, '\0'); | ||
104 | ✗ | return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff)); | ||
105 |
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1 | default: | |
106 | 1 | return luaX_token2str(ls, token); | ||
107 | } | |||
108 | } | |||
109 | ||||
110 | ||||
111 | 1 | static l_noret lexerror (LexState *ls, const char *msg, int token) { | ||
112 | 1 | msg = luaG_addinfo(ls->L, msg, ls->source, ls->linenumber); | ||
113 |
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1 | if (token) |
114 | 1 | luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token)); | ||
115 | 1 | luaD_throw(ls->L, LUA_ERRSYNTAX); | ||
116 | } | |||
117 | ||||
118 | ||||
119 | 1 | l_noret luaX_syntaxerror (LexState *ls, const char *msg) { | ||
120 | 1 | lexerror(ls, msg, ls->t.token); | ||
121 | } | |||
122 | ||||
123 | ||||
124 | /* | |||
125 | ** Creates a new string and anchors it in scanner's table so that it | |||
126 | ** will not be collected until the end of the compilation; by that time | |||
127 | ** it should be anchored somewhere. It also internalizes long strings, | |||
128 | ** ensuring there is only one copy of each unique string. The table | |||
129 | ** here is used as a set: the string enters as the key, while its value | |||
130 | ** is irrelevant. We use the string itself as the value only because it | |||
131 | ** is a TValue readily available. Later, the code generation can change | |||
132 | ** this value. | |||
133 | */ | |||
134 | 5228 | TString *luaX_newstring (LexState *ls, const char *str, size_t l) { | ||
135 | 5228 | lua_State *L = ls->L; | ||
136 | 5228 | TString *ts = luaS_newlstr(L, str, l); /* create new string */ | ||
137 | 5228 | const TValue *o = luaH_getstr(ls->h, ts); | ||
138 |
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5228 | if (!ttisnil(o)) /* string already present? */ |
139 | 3224 | ts = keystrval(nodefromval(o)); /* get saved copy */ | ||
140 | else { /* not in use yet */ | |||
141 | 2004 | TValue *stv = s2v(L->top.p++); /* reserve stack space for string */ | ||
142 | 2004 | setsvalue(L, stv, ts); /* temporarily anchor the string */ | ||
143 | 2004 | luaH_finishset(L, ls->h, stv, o, stv); /* t[string] = string */ | ||
144 | /* table is not a metatable, so it does not need to invalidate cache */ | |||
145 |
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2004 | luaC_checkGC(L); | |
146 | 2004 | L->top.p--; /* remove string from stack */ | ||
147 | } | |||
148 | 5228 | return ts; | ||
149 | } | |||
150 | ||||
151 | ||||
152 | /* | |||
153 | ** increment line number and skips newline sequence (any of | |||
154 | ** \n, \r, \n\r, or \r\n) | |||
155 | */ | |||
156 | 1108 | static void inclinenumber (LexState *ls) { | ||
157 | 1108 | int old = ls->current; | ||
158 | lua_assert(currIsNewline(ls)); | |||
159 |
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1108 | next(ls); /* skip '\n' or '\r' */ | |
160 |
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1108 | if (currIsNewline(ls) && ls->current != old) |
161 | ✗ | next(ls); /* skip '\n\r' or '\r\n' */ | ||
162 |
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1108 | if (++ls->linenumber >= MAX_INT) |
163 | ✗ | lexerror(ls, "chunk has too many lines", 0); | ||
164 | 1108 | } | ||
165 | ||||
166 | ||||
167 | 309 | void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source, | ||
168 | int firstchar) { | |||
169 | 309 | ls->t.token = 0; | ||
170 | 309 | ls->L = L; | ||
171 | 309 | ls->current = firstchar; | ||
172 | 309 | ls->lookahead.token = TK_EOS; /* no look-ahead token */ | ||
173 | 309 | ls->z = z; | ||
174 | 309 | ls->fs = NULL; | ||
175 | 309 | ls->linenumber = 1; | ||
176 | 309 | ls->lastline = 1; | ||
177 | 309 | ls->source = source; | ||
178 | 309 | ls->envn = luaS_newliteral(L, LUA_ENV); /* get env name */ | ||
179 | 309 | luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */ | ||
180 | 309 | } | ||
181 | ||||
182 | ||||
183 | ||||
184 | /* | |||
185 | ** ======================================================= | |||
186 | ** LEXICAL ANALYZER | |||
187 | ** ======================================================= | |||
188 | */ | |||
189 | ||||
190 | ||||
191 | 1486 | static int check_next1 (LexState *ls, int c) { | ||
192 |
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1486 | if (ls->current == c) { |
193 |
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330 | next(ls); | |
194 | 330 | return 1; | ||
195 | } | |||
196 | 1156 | else return 0; | ||
197 | } | |||
198 | ||||
199 | ||||
200 | /* | |||
201 | ** Check whether current char is in set 'set' (with two chars) and | |||
202 | ** saves it | |||
203 | */ | |||
204 | 4282 | static int check_next2 (LexState *ls, const char *set) { | ||
205 | lua_assert(set[2] == '\0'); | |||
206 |
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4282 | if (ls->current == set[0] || ls->current == set[1]) { |
207 |
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584 | save_and_next(ls); | |
208 | 584 | return 1; | ||
209 | } | |||
210 | 3698 | else return 0; | ||
211 | } | |||
212 | ||||
213 | ||||
214 | /* LUA_NUMBER */ | |||
215 | /* | |||
216 | ** This function is quite liberal in what it accepts, as 'luaO_str2num' | |||
217 | ** will reject ill-formed numerals. Roughly, it accepts the following | |||
218 | ** pattern: | |||
219 | ** | |||
220 | ** %d(%x|%.|([Ee][+-]?))* | 0[Xx](%x|%.|([Pp][+-]?))* | |||
221 | ** | |||
222 | ** The only tricky part is to accept [+-] only after a valid exponent | |||
223 | ** mark, to avoid reading '3-4' or '0xe+1' as a single number. | |||
224 | ** | |||
225 | ** The caller might have already read an initial dot. | |||
226 | */ | |||
227 | 1782 | static int read_numeral (LexState *ls, SemInfo *seminfo) { | ||
228 | TValue obj; | |||
229 | 1782 | const char *expo = "Ee"; | ||
230 | 1782 | int first = ls->current; | ||
231 | lua_assert(lisdigit(ls->current)); | |||
232 |
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1782 | save_and_next(ls); | |
233 |
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1782 | if (first == '0' && check_next2(ls, "xX")) /* hexadecimal? */ |
234 | 584 | expo = "Pp"; | ||
235 | for (;;) { | |||
236 |
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3546 | if (check_next2(ls, expo)) /* exponent mark? */ |
237 | ✗ | check_next2(ls, "-+"); /* optional exponent sign */ | ||
238 |
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3546 | else if (lisxdigit(ls->current) || ls->current == '.') /* '%x|%.' */ |
239 |
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1764 | save_and_next(ls); | |
240 | else break; | |||
241 | } | |||
242 |
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1782 | if (lislalpha(ls->current)) /* is numeral touching a letter? */ |
243 | ✗ | save_and_next(ls); /* force an error */ | ||
244 | 1782 | save(ls, '\0'); | ||
245 |
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1782 | if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0) /* format error? */ |
246 | ✗ | lexerror(ls, "malformed number", TK_FLT); | ||
247 |
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1782 | if (ttisinteger(&obj)) { |
248 | 1715 | seminfo->i = ivalue(&obj); | ||
249 | 1715 | return TK_INT; | ||
250 | } | |||
251 | else { | |||
252 | lua_assert(ttisfloat(&obj)); | |||
253 | 67 | seminfo->r = fltvalue(&obj); | ||
254 | 67 | return TK_FLT; | ||
255 | } | |||
256 | } | |||
257 | ||||
258 | ||||
259 | /* | |||
260 | ** read a sequence '[=*[' or ']=*]', leaving the last bracket. If | |||
261 | ** sequence is well formed, return its number of '='s + 2; otherwise, | |||
262 | ** return 1 if it is a single bracket (no '='s and no 2nd bracket); | |||
263 | ** otherwise (an unfinished '[==...') return 0. | |||
264 | */ | |||
265 | 293 | static size_t skip_sep (LexState *ls) { | ||
266 | 293 | size_t count = 0; | ||
267 | 293 | int s = ls->current; | ||
268 | lua_assert(s == '[' || s == ']'); | |||
269 |
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293 | save_and_next(ls); | |
270 |
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293 | while (ls->current == '=') { |
271 | ✗ | save_and_next(ls); | ||
272 | ✗ | count++; | ||
273 | } | |||
274 | 293 | return (ls->current == s) ? count + 2 | ||
275 |
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586 | : (count == 0) ? 1 | |
276 | 293 | : 0; | ||
277 | } | |||
278 | ||||
279 | ||||
280 | ✗ | static void read_long_string (LexState *ls, SemInfo *seminfo, size_t sep) { | ||
281 | ✗ | int line = ls->linenumber; /* initial line (for error message) */ | ||
282 | ✗ | save_and_next(ls); /* skip 2nd '[' */ | ||
283 | ✗ | if (currIsNewline(ls)) /* string starts with a newline? */ | ||
284 | ✗ | inclinenumber(ls); /* skip it */ | ||
285 | for (;;) { | |||
286 | ✗ | switch (ls->current) { | ||
287 | ✗ | case EOZ: { /* error */ | ||
288 | ✗ | const char *what = (seminfo ? "string" : "comment"); | ||
289 | ✗ | const char *msg = luaO_pushfstring(ls->L, | ||
290 | "unfinished long %s (starting at line %d)", what, line); | |||
291 | ✗ | lexerror(ls, msg, TK_EOS); | ||
292 | break; /* to avoid warnings */ | |||
293 | } | |||
294 | ✗ | case ']': { | ||
295 | ✗ | if (skip_sep(ls) == sep) { | ||
296 | ✗ | save_and_next(ls); /* skip 2nd ']' */ | ||
297 | ✗ | goto endloop; | ||
298 | } | |||
299 | ✗ | break; | ||
300 | } | |||
301 | ✗ | case '\n': case '\r': { | ||
302 | ✗ | save(ls, '\n'); | ||
303 | ✗ | inclinenumber(ls); | ||
304 | ✗ | if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */ | ||
305 | ✗ | break; | ||
306 | } | |||
307 | ✗ | default: { | ||
308 | ✗ | if (seminfo) save_and_next(ls); | ||
309 | ✗ | else next(ls); | ||
310 | } | |||
311 | } | |||
312 | ✗ | } endloop: | ||
313 | ✗ | if (seminfo) | ||
314 | ✗ | seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + sep, | ||
315 | ✗ | luaZ_bufflen(ls->buff) - 2 * sep); | ||
316 | ✗ | } | ||
317 | ||||
318 | ||||
319 | ✗ | static void esccheck (LexState *ls, int c, const char *msg) { | ||
320 | ✗ | if (!c) { | ||
321 | ✗ | if (ls->current != EOZ) | ||
322 | ✗ | save_and_next(ls); /* add current to buffer for error message */ | ||
323 | ✗ | lexerror(ls, msg, TK_STRING); | ||
324 | } | |||
325 | ✗ | } | ||
326 | ||||
327 | ||||
328 | ✗ | static int gethexa (LexState *ls) { | ||
329 | ✗ | save_and_next(ls); | ||
330 | ✗ | esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected"); | ||
331 | ✗ | return luaO_hexavalue(ls->current); | ||
332 | } | |||
333 | ||||
334 | ||||
335 | ✗ | static int readhexaesc (LexState *ls) { | ||
336 | ✗ | int r = gethexa(ls); | ||
337 | ✗ | r = (r << 4) + gethexa(ls); | ||
338 | ✗ | luaZ_buffremove(ls->buff, 2); /* remove saved chars from buffer */ | ||
339 | ✗ | return r; | ||
340 | } | |||
341 | ||||
342 | ||||
343 | ✗ | static unsigned long readutf8esc (LexState *ls) { | ||
344 | unsigned long r; | |||
345 | ✗ | int i = 4; /* chars to be removed: '\', 'u', '{', and first digit */ | ||
346 | ✗ | save_and_next(ls); /* skip 'u' */ | ||
347 | ✗ | esccheck(ls, ls->current == '{', "missing '{'"); | ||
348 | ✗ | r = gethexa(ls); /* must have at least one digit */ | ||
349 | ✗ | while (cast_void(save_and_next(ls)), lisxdigit(ls->current)) { | ||
350 | ✗ | i++; | ||
351 | ✗ | esccheck(ls, r <= (0x7FFFFFFFu >> 4), "UTF-8 value too large"); | ||
352 | ✗ | r = (r << 4) + luaO_hexavalue(ls->current); | ||
353 | } | |||
354 | ✗ | esccheck(ls, ls->current == '}', "missing '}'"); | ||
355 | ✗ | next(ls); /* skip '}' */ | ||
356 | ✗ | luaZ_buffremove(ls->buff, i); /* remove saved chars from buffer */ | ||
357 | ✗ | return r; | ||
358 | } | |||
359 | ||||
360 | ||||
361 | ✗ | static void utf8esc (LexState *ls) { | ||
362 | char buff[UTF8BUFFSZ]; | |||
363 | ✗ | int n = luaO_utf8esc(buff, readutf8esc(ls)); | ||
364 | ✗ | for (; n > 0; n--) /* add 'buff' to string */ | ||
365 | ✗ | save(ls, buff[UTF8BUFFSZ - n]); | ||
366 | ✗ | } | ||
367 | ||||
368 | ||||
369 | ✗ | static int readdecesc (LexState *ls) { | ||
370 | int i; | |||
371 | ✗ | int r = 0; /* result accumulator */ | ||
372 | ✗ | for (i = 0; i < 3 && lisdigit(ls->current); i++) { /* read up to 3 digits */ | ||
373 | ✗ | r = 10*r + ls->current - '0'; | ||
374 | ✗ | save_and_next(ls); | ||
375 | } | |||
376 | ✗ | esccheck(ls, r <= UCHAR_MAX, "decimal escape too large"); | ||
377 | ✗ | luaZ_buffremove(ls->buff, i); /* remove read digits from buffer */ | ||
378 | ✗ | return r; | ||
379 | } | |||
380 | ||||
381 | ||||
382 | 154 | static void read_string (LexState *ls, int del, SemInfo *seminfo) { | ||
383 |
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154 | save_and_next(ls); /* keep delimiter (for error messages) */ | |
384 |
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535 | while (ls->current != del) { |
385 |
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381 | switch (ls->current) { | |
386 | ✗ | case EOZ: | ||
387 | ✗ | lexerror(ls, "unfinished string", TK_EOS); | ||
388 | break; /* to avoid warnings */ | |||
389 | ✗ | case '\n': | ||
390 | case '\r': | |||
391 | ✗ | lexerror(ls, "unfinished string", TK_STRING); | ||
392 | break; /* to avoid warnings */ | |||
393 | ✗ | case '\\': { /* escape sequences */ | ||
394 | int c; /* final character to be saved */ | |||
395 | ✗ | save_and_next(ls); /* keep '\\' for error messages */ | ||
396 | ✗ | switch (ls->current) { | ||
397 | ✗ | case 'a': c = '\a'; goto read_save; | ||
398 | ✗ | case 'b': c = '\b'; goto read_save; | ||
399 | ✗ | case 'f': c = '\f'; goto read_save; | ||
400 | ✗ | case 'n': c = '\n'; goto read_save; | ||
401 | ✗ | case 'r': c = '\r'; goto read_save; | ||
402 | ✗ | case 't': c = '\t'; goto read_save; | ||
403 | ✗ | case 'v': c = '\v'; goto read_save; | ||
404 | ✗ | case 'x': c = readhexaesc(ls); goto read_save; | ||
405 | ✗ | case 'u': utf8esc(ls); goto no_save; | ||
406 | ✗ | case '\n': case '\r': | ||
407 | ✗ | inclinenumber(ls); c = '\n'; goto only_save; | ||
408 | ✗ | case '\\': case '\"': case '\'': | ||
409 | ✗ | c = ls->current; goto read_save; | ||
410 | ✗ | case EOZ: goto no_save; /* will raise an error next loop */ | ||
411 | ✗ | case 'z': { /* zap following span of spaces */ | ||
412 | ✗ | luaZ_buffremove(ls->buff, 1); /* remove '\\' */ | ||
413 | ✗ | next(ls); /* skip the 'z' */ | ||
414 | ✗ | while (lisspace(ls->current)) { | ||
415 | ✗ | if (currIsNewline(ls)) inclinenumber(ls); | ||
416 | ✗ | else next(ls); | ||
417 | } | |||
418 | ✗ | goto no_save; | ||
419 | } | |||
420 | ✗ | default: { | ||
421 | ✗ | esccheck(ls, lisdigit(ls->current), "invalid escape sequence"); | ||
422 | ✗ | c = readdecesc(ls); /* digital escape '\ddd' */ | ||
423 | ✗ | goto only_save; | ||
424 | } | |||
425 | } | |||
426 | ✗ | read_save: | ||
427 | ✗ | next(ls); | ||
428 | /* go through */ | |||
429 | ✗ | only_save: | ||
430 | ✗ | luaZ_buffremove(ls->buff, 1); /* remove '\\' */ | ||
431 | ✗ | save(ls, c); | ||
432 | /* go through */ | |||
433 | ✗ | no_save: break; | ||
434 | } | |||
435 |
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381 | default: | |
436 |
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381 | save_and_next(ls); | |
437 | } | |||
438 | } | |||
439 |
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154 | save_and_next(ls); /* skip delimiter */ | |
440 | 308 | seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1, | ||
441 | 154 | luaZ_bufflen(ls->buff) - 2); | ||
442 | 154 | } | ||
443 | ||||
444 | ||||
445 | 13251 | static int llex (LexState *ls, SemInfo *seminfo) { | ||
446 | 13251 | luaZ_resetbuffer(ls->buff); | ||
447 | for (;;) { | |||
448 |
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25344 | switch (ls->current) { | |
449 |
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1108 | case '\n': case '\r': { /* line breaks */ | |
450 | 1108 | inclinenumber(ls); | ||
451 | 1108 | break; | ||
452 | } | |||
453 |
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10975 | case ' ': case '\f': case '\t': case '\v': { /* spaces */ | |
454 |
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10975 | next(ls); | |
455 | 10975 | break; | ||
456 | } | |||
457 |
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229 | case '-': { /* '-' or '--' (comment) */ | |
458 |
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229 | next(ls); | |
459 |
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229 | if (ls->current != '-') return '-'; |
460 | /* else is a comment */ | |||
461 |
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10 | next(ls); | |
462 |
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10 | if (ls->current == '[') { /* long comment? */ |
463 | ✗ | size_t sep = skip_sep(ls); | ||
464 | ✗ | luaZ_resetbuffer(ls->buff); /* 'skip_sep' may dirty the buffer */ | ||
465 | ✗ | if (sep >= 2) { | ||
466 | ✗ | read_long_string(ls, NULL, sep); /* skip long comment */ | ||
467 | ✗ | luaZ_resetbuffer(ls->buff); /* previous call may dirty the buff. */ | ||
468 | ✗ | break; | ||
469 | } | |||
470 | } | |||
471 | /* else short comment */ | |||
472 |
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248 | while (!currIsNewline(ls) && ls->current != EOZ) |
473 |
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238 | next(ls); /* skip until end of line (or end of file) */ | |
474 | 10 | break; | ||
475 | } | |||
476 |
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293 | case '[': { /* long string or simply '[' */ | |
477 | 293 | size_t sep = skip_sep(ls); | ||
478 |
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293 | if (sep >= 2) { |
479 | ✗ | read_long_string(ls, seminfo, sep); | ||
480 | ✗ | return TK_STRING; | ||
481 | } | |||
482 |
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293 | else if (sep == 0) /* '[=...' missing second bracket? */ |
483 | ✗ | lexerror(ls, "invalid long string delimiter", TK_STRING); | ||
484 | 293 | return '['; | ||
485 | } | |||
486 |
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682 | case '=': { | |
487 |
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682 | next(ls); | |
488 |
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682 | if (check_next1(ls, '=')) return TK_EQ; /* '==' */ |
489 | 656 | else return '='; | ||
490 | } | |||
491 |
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77 | case '<': { | |
492 |
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77 | next(ls); | |
493 |
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77 | if (check_next1(ls, '=')) return TK_LE; /* '<=' */ |
494 |
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77 | else if (check_next1(ls, '<')) return TK_SHL; /* '<<' */ |
495 | ✗ | else return '<'; | ||
496 | } | |||
497 |
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152 | case '>': { | |
498 |
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152 | next(ls); | |
499 |
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152 | if (check_next1(ls, '=')) return TK_GE; /* '>=' */ |
500 |
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152 | else if (check_next1(ls, '>')) return TK_SHR; /* '>>' */ |
501 | 57 | else return '>'; | ||
502 | } | |||
503 |
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43 | case '/': { | |
504 |
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43 | next(ls); | |
505 |
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43 | if (check_next1(ls, '/')) return TK_IDIV; /* '//' */ |
506 | 43 | else return '/'; | ||
507 | } | |||
508 |
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91 | case '~': { | |
509 |
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91 | next(ls); | |
510 |
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91 | if (check_next1(ls, '=')) return TK_NE; /* '~=' */ |
511 | 22 | else return '~'; | ||
512 | } | |||
513 |
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20 | case ':': { | |
514 |
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20 | next(ls); | |
515 |
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20 | if (check_next1(ls, ':')) return TK_DBCOLON; /* '::' */ |
516 | 20 | else return ':'; | ||
517 | } | |||
518 |
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154 | case '"': case '\'': { /* short literal strings */ | |
519 | 154 | read_string(ls, ls->current, seminfo); | ||
520 | 154 | return TK_STRING; | ||
521 | } | |||
522 |
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129 | case '.': { /* '.', '..', '...', or number */ | |
523 |
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129 | save_and_next(ls); | |
524 |
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129 | if (check_next1(ls, '.')) { |
525 |
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63 | if (check_next1(ls, '.')) |
526 | ✗ | return TK_DOTS; /* '...' */ | ||
527 | 63 | else return TK_CONCAT; /* '..' */ | ||
528 | } | |||
529 |
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66 | else if (!lisdigit(ls->current)) return '.'; |
530 | ✗ | else return read_numeral(ls, seminfo); | ||
531 | } | |||
532 |
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1782 | case '0': case '1': case '2': case '3': case '4': | |
533 | case '5': case '6': case '7': case '8': case '9': { | |||
534 |
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1782 | return read_numeral(ls, seminfo); | |
535 | } | |||
536 |
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|
309 | case EOZ: { | |
537 | 309 | return TK_EOS; | ||
538 | } | |||
539 |
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9300 | default: { | |
540 |
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9300 | if (lislalpha(ls->current)) { /* identifier or reserved word? */ |
541 | TString *ts; | |||
542 | do { | |||
543 |
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33568 | save_and_next(ls); | |
544 |
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33568 | } while (lislalnum(ls->current)); |
545 | 5059 | ts = luaX_newstring(ls, luaZ_buffer(ls->buff), | ||
546 | 5059 | luaZ_bufflen(ls->buff)); | ||
547 | 5059 | seminfo->ts = ts; | ||
548 |
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5059 | if (isreserved(ts)) /* reserved word? */ |
549 | 1707 | return ts->extra - 1 + FIRST_RESERVED; | ||
550 | else { | |||
551 | 3352 | return TK_NAME; | ||
552 | } | |||
553 | } | |||
554 | else { /* single-char tokens ('+', '*', '%', '{', '}', ...) */ | |||
555 | 4241 | int c = ls->current; | ||
556 |
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4241 | next(ls); | |
557 | 4241 | return c; | ||
558 | } | |||
559 | } | |||
560 | } | |||
561 | } | |||
562 | } | |||
563 | ||||
564 | ||||
565 | 13251 | void luaX_next (LexState *ls) { | ||
566 | 13251 | ls->lastline = ls->linenumber; | ||
567 |
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13251 | if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */ |
568 | ✗ | ls->t = ls->lookahead; /* use this one */ | ||
569 | ✗ | ls->lookahead.token = TK_EOS; /* and discharge it */ | ||
570 | } | |||
571 | else | |||
572 | 13251 | ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */ | ||
573 | 13251 | } | ||
574 | ||||
575 | ||||
576 | ✗ | int luaX_lookahead (LexState *ls) { | ||
577 | lua_assert(ls->lookahead.token == TK_EOS); | |||
578 | ✗ | ls->lookahead.token = llex(ls, &ls->lookahead.seminfo); | ||
579 | ✗ | return ls->lookahead.token; | ||
580 | } | |||
581 | ||||
582 |