The Battle for Wesnoth  1.15.0-dev
llex.cpp
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1 /*
2 ** $Id: llex.c,v 2.96.1.1 2017/04/19 17:20:42 roberto Exp $
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 static void save (LexState *ls, int c) {
58  Mbuffer *b = ls->buff;
59  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  b->buffer[luaZ_bufflen(b)++] = cast(char, c);
67 }
68 
69 
70 void luaX_init (lua_State *L) {
71  int i;
72  TString *e = luaS_newliteral(L, LUA_ENV); /* create env name */
73  luaC_fix(L, obj2gco(e)); /* never collect this name */
74  for (i=0; i<NUM_RESERVED; i++) {
75  TString *ts = luaS_new(L, luaX_tokens[i]);
76  luaC_fix(L, obj2gco(ts)); /* reserved words are never collected */
77  ts->extra = cast_byte(i+1); /* reserved word */
78  }
79 }
80 
81 
82 const char *luaX_token2str (LexState *ls, int token) {
83  if (token < FIRST_RESERVED) { /* single-byte symbols? */
84  lua_assert(token == cast_uchar(token));
85  return luaO_pushfstring(ls->L, "'%c'", token);
86  }
87  else {
88  const char *s = luaX_tokens[token - FIRST_RESERVED];
89  if (token < TK_EOS) /* fixed format (symbols and reserved words)? */
90  return luaO_pushfstring(ls->L, "'%s'", s);
91  else /* names, strings, and numerals */
92  return s;
93  }
94 }
95 
96 
97 static const char *txtToken (LexState *ls, int token) {
98  switch (token) {
99  case TK_NAME: case TK_STRING:
100  case TK_FLT: case TK_INT:
101  save(ls, '\0');
102  return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff));
103  default:
104  return luaX_token2str(ls, token);
105  }
106 }
107 
108 
109 static l_noret lexerror (LexState *ls, const char *msg, int token) {
110  msg = luaG_addinfo(ls->L, msg, ls->source, ls->linenumber);
111  if (token)
112  luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token));
113  luaD_throw(ls->L, LUA_ERRSYNTAX);
114 }
115 
116 
117 l_noret luaX_syntaxerror (LexState *ls, const char *msg) {
118  lexerror(ls, msg, ls->t.token);
119 }
120 
121 
122 /*
123 ** creates a new string and anchors it in scanner's table so that
124 ** it will not be collected until the end of the compilation
125 ** (by that time it should be anchored somewhere)
126 */
127 TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
128  lua_State *L = ls->L;
129  TValue *o; /* entry for 'str' */
130  TString *ts = luaS_newlstr(L, str, l); /* create new string */
131  setsvalue2s(L, L->top++, ts); /* temporarily anchor it in stack */
132  o = luaH_set(L, ls->h, L->top - 1);
133  if (ttisnil(o)) { /* not in use yet? */
134  /* boolean value does not need GC barrier;
135  table has no metatable, so it does not need to invalidate cache */
136  setbvalue(o, 1); /* t[string] = true */
137  luaC_checkGC(L);
138  }
139  else { /* string already present */
140  ts = tsvalue(keyfromval(o)); /* re-use value previously stored */
141  }
142  L->top--; /* remove string from stack */
143  return ts;
144 }
145 
146 
147 /*
148 ** increment line number and skips newline sequence (any of
149 ** \n, \r, \n\r, or \r\n)
150 */
151 static void inclinenumber (LexState *ls) {
152  int old = ls->current;
154  next(ls); /* skip '\n' or '\r' */
155  if (currIsNewline(ls) && ls->current != old)
156  next(ls); /* skip '\n\r' or '\r\n' */
157  if (++ls->linenumber >= MAX_INT)
158  lexerror(ls, "chunk has too many lines", 0);
159 }
160 
161 
162 void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,
163  int firstchar) {
164  ls->t.token = 0;
165  ls->L = L;
166  ls->current = firstchar;
167  ls->lookahead.token = TK_EOS; /* no look-ahead token */
168  ls->z = z;
169  ls->fs = NULL;
170  ls->linenumber = 1;
171  ls->lastline = 1;
172  ls->source = source;
173  ls->envn = luaS_newliteral(L, LUA_ENV); /* get env name */
174  luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
175 }
176 
177 
178 
179 /*
180 ** =======================================================
181 ** LEXICAL ANALYZER
182 ** =======================================================
183 */
184 
185 
186 static int check_next1 (LexState *ls, int c) {
187  if (ls->current == c) {
188  next(ls);
189  return 1;
190  }
191  else return 0;
192 }
193 
194 
195 /*
196 ** Check whether current char is in set 'set' (with two chars) and
197 ** saves it
198 */
199 static int check_next2 (LexState *ls, const char *set) {
200  lua_assert(set[2] == '\0');
201  if (ls->current == set[0] || ls->current == set[1]) {
202  save_and_next(ls);
203  return 1;
204  }
205  else return 0;
206 }
207 
208 
209 /* LUA_NUMBER */
210 /*
211 ** this function is quite liberal in what it accepts, as 'luaO_str2num'
212 ** will reject ill-formed numerals.
213 */
214 static int read_numeral (LexState *ls, SemInfo *seminfo) {
215  TValue obj;
216  const char *expo = "Ee";
217  int first = ls->current;
219  save_and_next(ls);
220  if (first == '0' && check_next2(ls, "xX")) /* hexadecimal? */
221  expo = "Pp";
222  for (;;) {
223  if (check_next2(ls, expo)) /* exponent part? */
224  check_next2(ls, "-+"); /* optional exponent sign */
225  if (lisxdigit(ls->current))
226  save_and_next(ls);
227  else if (ls->current == '.')
228  save_and_next(ls);
229  else break;
230  }
231  save(ls, '\0');
232  if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0) /* format error? */
233  lexerror(ls, "malformed number", TK_FLT);
234  if (ttisinteger(&obj)) {
235  seminfo->i = ivalue(&obj);
236  return TK_INT;
237  }
238  else {
239  lua_assert(ttisfloat(&obj));
240  seminfo->r = fltvalue(&obj);
241  return TK_FLT;
242  }
243 }
244 
245 
246 /*
247 ** skip a sequence '[=*[' or ']=*]'; if sequence is well formed, return
248 ** its number of '='s; otherwise, return a negative number (-1 iff there
249 ** are no '='s after initial bracket)
250 */
251 static int skip_sep (LexState *ls) {
252  int count = 0;
253  int s = ls->current;
254  lua_assert(s == '[' || s == ']');
255  save_and_next(ls);
256  while (ls->current == '=') {
257  save_and_next(ls);
258  count++;
259  }
260  return (ls->current == s) ? count : (-count) - 1;
261 }
262 
263 
264 static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
265  int line = ls->linenumber; /* initial line (for error message) */
266  save_and_next(ls); /* skip 2nd '[' */
267  if (currIsNewline(ls)) /* string starts with a newline? */
268  inclinenumber(ls); /* skip it */
269  for (;;) {
270  switch (ls->current) {
271  case EOZ: { /* error */
272  const char *what = (seminfo ? "string" : "comment");
273  const char *msg = luaO_pushfstring(ls->L,
274  "unfinished long %s (starting at line %d)", what, line);
275  lexerror(ls, msg, TK_EOS);
276  break; /* to avoid warnings */
277  }
278  case ']': {
279  if (skip_sep(ls) == sep) {
280  save_and_next(ls); /* skip 2nd ']' */
281  goto endloop;
282  }
283  break;
284  }
285  case '\n': case '\r': {
286  save(ls, '\n');
287  inclinenumber(ls);
288  if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */
289  break;
290  }
291  default: {
292  if (seminfo) save_and_next(ls);
293  else next(ls);
294  }
295  }
296  } endloop:
297  if (seminfo)
298  seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + (2 + sep),
299  luaZ_bufflen(ls->buff) - 2*(2 + sep));
300 }
301 
302 
303 static void esccheck (LexState *ls, int c, const char *msg) {
304  if (!c) {
305  if (ls->current != EOZ)
306  save_and_next(ls); /* add current to buffer for error message */
307  lexerror(ls, msg, TK_STRING);
308  }
309 }
310 
311 
312 static int gethexa (LexState *ls) {
313  save_and_next(ls);
314  esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected");
315  return luaO_hexavalue(ls->current);
316 }
317 
318 
319 static int readhexaesc (LexState *ls) {
320  int r = gethexa(ls);
321  r = (r << 4) + gethexa(ls);
322  luaZ_buffremove(ls->buff, 2); /* remove saved chars from buffer */
323  return r;
324 }
325 
326 
327 static unsigned long readutf8esc (LexState *ls) {
328  unsigned long r;
329  int i = 4; /* chars to be removed: '\', 'u', '{', and first digit */
330  save_and_next(ls); /* skip 'u' */
331  esccheck(ls, ls->current == '{', "missing '{'");
332  r = gethexa(ls); /* must have at least one digit */
333  while ((save_and_next(ls), lisxdigit(ls->current))) {
334  i++;
335  r = (r << 4) + luaO_hexavalue(ls->current);
336  esccheck(ls, r <= 0x10FFFF, "UTF-8 value too large");
337  }
338  esccheck(ls, ls->current == '}', "missing '}'");
339  next(ls); /* skip '}' */
340  luaZ_buffremove(ls->buff, i); /* remove saved chars from buffer */
341  return r;
342 }
343 
344 
345 static void utf8esc (LexState *ls) {
346  char buff[UTF8BUFFSZ];
347  int n = luaO_utf8esc(buff, readutf8esc(ls));
348  for (; n > 0; n--) /* add 'buff' to string */
349  save(ls, buff[UTF8BUFFSZ - n]);
350 }
351 
352 
353 static int readdecesc (LexState *ls) {
354  int i;
355  int r = 0; /* result accumulator */
356  for (i = 0; i < 3 && lisdigit(ls->current); i++) { /* read up to 3 digits */
357  r = 10*r + ls->current - '0';
358  save_and_next(ls);
359  }
360  esccheck(ls, r <= UCHAR_MAX, "decimal escape too large");
361  luaZ_buffremove(ls->buff, i); /* remove read digits from buffer */
362  return r;
363 }
364 
365 
366 static void read_string (LexState *ls, int del, SemInfo *seminfo) {
367  save_and_next(ls); /* keep delimiter (for error messages) */
368  while (ls->current != del) {
369  switch (ls->current) {
370  case EOZ:
371  lexerror(ls, "unfinished string", TK_EOS);
372  break; /* to avoid warnings */
373  case '\n':
374  case '\r':
375  lexerror(ls, "unfinished string", TK_STRING);
376  break; /* to avoid warnings */
377  case '\\': { /* escape sequences */
378  int c; /* final character to be saved */
379  save_and_next(ls); /* keep '\\' for error messages */
380  switch (ls->current) {
381  case 'a': c = '\a'; goto read_save;
382  case 'b': c = '\b'; goto read_save;
383  case 'f': c = '\f'; goto read_save;
384  case 'n': c = '\n'; goto read_save;
385  case 'r': c = '\r'; goto read_save;
386  case 't': c = '\t'; goto read_save;
387  case 'v': c = '\v'; goto read_save;
388  case 'x': c = readhexaesc(ls); goto read_save;
389  case 'u': utf8esc(ls); goto no_save;
390  case '\n': case '\r':
391  inclinenumber(ls); c = '\n'; goto only_save;
392  case '\\': case '\"': case '\'':
393  c = ls->current; goto read_save;
394  case EOZ: goto no_save; /* will raise an error next loop */
395  case 'z': { /* zap following span of spaces */
396  luaZ_buffremove(ls->buff, 1); /* remove '\\' */
397  next(ls); /* skip the 'z' */
398  while (lisspace(ls->current)) {
399  if (currIsNewline(ls)) inclinenumber(ls);
400  else next(ls);
401  }
402  goto no_save;
403  }
404  default: {
405  esccheck(ls, lisdigit(ls->current), "invalid escape sequence");
406  c = readdecesc(ls); /* digital escape '\ddd' */
407  goto only_save;
408  }
409  }
410  read_save:
411  next(ls);
412  /* go through */
413  only_save:
414  luaZ_buffremove(ls->buff, 1); /* remove '\\' */
415  save(ls, c);
416  /* go through */
417  no_save: break;
418  }
419  default:
420  save_and_next(ls);
421  }
422  }
423  save_and_next(ls); /* skip delimiter */
424  seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,
425  luaZ_bufflen(ls->buff) - 2);
426 }
427 
428 
429 static int llex (LexState *ls, SemInfo *seminfo) {
430  luaZ_resetbuffer(ls->buff);
431  for (;;) {
432  switch (ls->current) {
433  case '\n': case '\r': { /* line breaks */
434  inclinenumber(ls);
435  break;
436  }
437  case ' ': case '\f': case '\t': case '\v': { /* spaces */
438  next(ls);
439  break;
440  }
441  case '-': { /* '-' or '--' (comment) */
442  next(ls);
443  if (ls->current != '-') return '-';
444  /* else is a comment */
445  next(ls);
446  if (ls->current == '[') { /* long comment? */
447  int sep = skip_sep(ls);
448  luaZ_resetbuffer(ls->buff); /* 'skip_sep' may dirty the buffer */
449  if (sep >= 0) {
450  read_long_string(ls, NULL, sep); /* skip long comment */
451  luaZ_resetbuffer(ls->buff); /* previous call may dirty the buff. */
452  break;
453  }
454  }
455  /* else short comment */
456  while (!currIsNewline(ls) && ls->current != EOZ)
457  next(ls); /* skip until end of line (or end of file) */
458  break;
459  }
460  case '[': { /* long string or simply '[' */
461  int sep = skip_sep(ls);
462  if (sep >= 0) {
463  read_long_string(ls, seminfo, sep);
464  return TK_STRING;
465  }
466  else if (sep != -1) /* '[=...' missing second bracket */
467  lexerror(ls, "invalid long string delimiter", TK_STRING);
468  return '[';
469  }
470  case '=': {
471  next(ls);
472  if (check_next1(ls, '=')) return TK_EQ;
473  else return '=';
474  }
475  case '<': {
476  next(ls);
477  if (check_next1(ls, '=')) return TK_LE;
478  else if (check_next1(ls, '<')) return TK_SHL;
479  else return '<';
480  }
481  case '>': {
482  next(ls);
483  if (check_next1(ls, '=')) return TK_GE;
484  else if (check_next1(ls, '>')) return TK_SHR;
485  else return '>';
486  }
487  case '/': {
488  next(ls);
489  if (check_next1(ls, '/')) return TK_IDIV;
490  else return '/';
491  }
492  case '~': {
493  next(ls);
494  if (check_next1(ls, '=')) return TK_NE;
495  else return '~';
496  }
497  case ':': {
498  next(ls);
499  if (check_next1(ls, ':')) return TK_DBCOLON;
500  else return ':';
501  }
502  case '"': case '\'': { /* short literal strings */
503  read_string(ls, ls->current, seminfo);
504  return TK_STRING;
505  }
506  case '.': { /* '.', '..', '...', or number */
507  save_and_next(ls);
508  if (check_next1(ls, '.')) {
509  if (check_next1(ls, '.'))
510  return TK_DOTS; /* '...' */
511  else return TK_CONCAT; /* '..' */
512  }
513  else if (!lisdigit(ls->current)) return '.';
514  else return read_numeral(ls, seminfo);
515  }
516  case '0': case '1': case '2': case '3': case '4':
517  case '5': case '6': case '7': case '8': case '9': {
518  return read_numeral(ls, seminfo);
519  }
520  case EOZ: {
521  return TK_EOS;
522  }
523  default: {
524  if (lislalpha(ls->current)) { /* identifier or reserved word? */
525  TString *ts;
526  do {
527  save_and_next(ls);
528  } while (lislalnum(ls->current));
529  ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
530  luaZ_bufflen(ls->buff));
531  seminfo->ts = ts;
532  if (isreserved(ts)) /* reserved word? */
533  return ts->extra - 1 + FIRST_RESERVED;
534  else {
535  return TK_NAME;
536  }
537  }
538  else { /* single-char tokens (+ - / ...) */
539  int c = ls->current;
540  next(ls);
541  return c;
542  }
543  }
544  }
545  }
546 }
547 
548 
549 void luaX_next (LexState *ls) {
550  ls->lastline = ls->linenumber;
551  if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */
552  ls->t = ls->lookahead; /* use this one */
553  ls->lookahead.token = TK_EOS; /* and discharge it */
554  }
555  else
556  ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */
557 }
558 
559 
562  ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
563  return ls->lookahead.token;
564 }
565 
static unsigned long readutf8esc(LexState *ls)
Definition: llex.cpp:327
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Definition: llex.cpp:251
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Definition: llex.cpp:97
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Definition: llex.cpp:162
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Definition: llex.h:64
Definition: llex.h:33
static int llex(LexState *ls, SemInfo *seminfo)
Definition: llex.cpp:429
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Definition: llimits.h:117
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Definition: llex.cpp:82
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Definition: llex.cpp:214
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Definition: lctype.h:88
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Definition: ldo.cpp:110
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Definition: lobject.h:169
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Definition: llex.cpp:319
Definition: lzio.h:55
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Definition: llex.cpp:40
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Definition: llimits.h:89
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Definition: function.cpp:933
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Definition: lgc.cpp:194
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Definition: llex.h:70
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Definition: llex.cpp:353
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Definition: llex.h:58
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Definition: lua.h:50
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Definition: lzio.h:24
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Definition: llex.cpp:57
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Definition: llimits.h:51
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Definition: lobject.cpp:468
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Definition: lobject.cpp:331
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Definition: llex.h:44
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Definition: llex.cpp:345
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Definition: lobject.cpp:163
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Definition: llex.cpp:560
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Definition: llex.cpp:32
#define NUM_RESERVED
Definition: llex.h:40
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Definition: llex.cpp:151
Definition: llex.h:33
#define FIRST_RESERVED
Definition: llex.h:14
struct lua_State * L
Definition: llex.h:65
#define EOZ
Definition: lzio.h:16
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Definition: lgc.h:115
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Definition: lctype.h:83
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Definition: llex.h:68
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Definition: llex.h:18
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Definition: lzio.h:32
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Definition: llex.cpp:51
Definition: lzio.h:23
#define e
Definition: llex.h:36
Definition: llex.h:34
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Definition: llex.h:45
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Definition: lstring.cpp:199
Definition: llex.h:33
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Definition: lobject.h:272
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Definition: ldebug.cpp:628
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Definition: llex.h:67
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Definition: lctype.h:86
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Definition: lzio.h:33
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Definition: llimits.h:42
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Definition: llex.cpp:199
Definition: llex.h:36
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Definition: lzio.h:31
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Definition: llex.h:66
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Definition: llex.h:61