Exemplo n.º 1
0
Arquivo: llex.c Projeto: bcrist/lua
/*
** this function is quite liberal in what it accepts, as 'luaO_str2num'
** will reject ill-formed numerals.
*/
static int read_numeral (LexState *ls, SemInfo *seminfo) {
  TValue obj;
  const char *expo = "Ee";
  int first = ls->current;
  lua_assert(lisdigit(ls->current));
  save_and_next(ls);
  if (first == '0' && check_next2(ls, "xX"))  /* hexadecimal? */
    expo = "Pp";
  for (;;) {
    if (check_next2(ls, expo))  /* exponent part? */
      check_next2(ls, "-+");  /* optional exponent sign */
    if (lisxdigit(ls->current))
      save_and_next(ls);
    else if (ls->current == '.')
      save_and_next(ls);
    else break;
  }
  save(ls, '\0');
  if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0)  /* format error? */
    lexerror(ls, "malformed number", TK_FLT);
  if (ttisinteger(&obj)) {
    seminfo->i = ivalue(&obj);
    return TK_INT;
  }
  else {
    lua_assert(ttisfloat(&obj));
    seminfo->r = fltvalue(&obj);
    return TK_FLT;
  }
}
Exemplo n.º 2
0
/* LUA_NUMBER */
static void read_numeral (LexState *LS, int comma, SemInfo *seminfo) {
  size_t l = 0;
  checkbuffer(LS, l);
  if (comma) save(LS, '.', l);
  while (isdigit(LS->current)) {
    checkbuffer(LS, l);
    save_and_next(LS, l);
  }
  if (LS->current == '.') {
    save_and_next(LS, l);
    if (LS->current == '.') {
      save_and_next(LS, l);
      save(LS, '\0', l);
      luaX_lexerror(LS,
                 "ambiguous syntax (decimal point x string concatenation)",
                 TK_NUMBER);
    }
  }
  while (isdigit(LS->current)) {
    checkbuffer(LS, l);
    save_and_next(LS, l);
  }
  if (LS->current == 'e' || LS->current == 'E') {
    save_and_next(LS, l);  /* read `E' */
    if (LS->current == '+' || LS->current == '-')
      save_and_next(LS, l);  /* optional exponent sign */
    while (isdigit(LS->current)) {
      checkbuffer(LS, l);
      save_and_next(LS, l);
    }
  }
  save(LS, '\0', l);
  if (!luaO_str2d(luaZ_buffer(LS->buff), &seminfo->r))
    luaX_lexerror(LS, "malformed number", TK_NUMBER);
}
Exemplo n.º 3
0
/*
** change all characters 'from' in buffer to 'to'
*/
static void buffreplace (LexState *ls, char from, char to) {
  if (from != to) {
    size_t n = luaZ_bufflen(ls->buff);
    char *p = luaZ_buffer(ls->buff);
    while (n--)
      if (p[n] == from) p[n] = to;
  }
}
Exemplo n.º 4
0
static const char *txtToken (LexState *ls, int token) {
  switch (token) {
    case TK_NAME: case TK_STRING:
    case TK_FLT: case TK_INT:
      save(ls, '\0');
      return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff));
    default:
      return luaX_token2str(ls, token);
  }
}
Exemplo n.º 5
0
static void read_string (LexState *LS, int del, SemInfo *seminfo) {
  size_t l = 0;
  checkbuffer(LS, l);
  save_and_next(LS, l);
  while (LS->current != del) {
    checkbuffer(LS, l);
    switch (LS->current) {
      case EOZ:
        save(LS, '\0', l);
        luaX_lexerror(LS, "unfinished string", TK_EOS);
        break;  /* to avoid warnings */
      case '\n':
        save(LS, '\0', l);
        luaX_lexerror(LS, "unfinished string", TK_STRING);
        break;  /* to avoid warnings */
      case '\\':
        next(LS);  /* do not save the `\' */
        switch (LS->current) {
          case 'a': save(LS, '\a', l); next(LS); break;
          case 'b': save(LS, '\b', l); next(LS); break;
          case 'f': save(LS, '\f', l); next(LS); break;
          case 'n': save(LS, '\n', l); next(LS); break;
          case 'r': save(LS, '\r', l); next(LS); break;
          case 't': save(LS, '\t', l); next(LS); break;
          case 'v': save(LS, '\v', l); next(LS); break;
          case '\n': save(LS, '\n', l); inclinenumber(LS); break;
          case EOZ: break;  /* will raise an error next loop */
          default: {
            if (!isdigit(LS->current))
              save_and_next(LS, l);  /* handles \\, \", \', and \? */
            else {  /* \xxx */
              int c = 0;
              int i = 0;
              do {
                c = 10*c + (LS->current-'0');
                next(LS);
              } while (++i<3 && isdigit(LS->current));
              if (c > UCHAR_MAX) {
                save(LS, '\0', l);
                luaX_lexerror(LS, "escape sequence too large", TK_STRING);
              }
              save(LS, c, l);
            }
          }
        }
        break;
      default:
        save_and_next(LS, l);
    }
  }
  save_and_next(LS, l);  /* skip delimiter */
  save(LS, '\0', l);
  seminfo->ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff) + 1, l - 3);
}
Exemplo n.º 6
0
void luaX_syntaxerror (LexState *ls, const char *msg) {
  const char *lasttoken;
  switch (ls->t.token) {
    case TK_NAME:
      lasttoken = getstr(ls->t.seminfo.ts);
      break;
    case TK_STRING:
    case TK_NUMBER:
      lasttoken = luaZ_buffer(ls->buff);
      break;
    default:
      lasttoken = luaX_token2str(ls, ls->t.token);
      break;
  }
  luaX_error(ls, msg, lasttoken);
}
Exemplo n.º 7
0
static void read_long_string (LexState *LS, SemInfo *seminfo) {
  int cont = 0;
  size_t l = 0;
  checkbuffer(LS, l);
  save(LS, '[', l);  /* save first `[' */
  save_and_next(LS, l);  /* pass the second `[' */
  if (LS->current == '\n')  /* string starts with a newline? */
    inclinenumber(LS);  /* skip it */
  for (;;) {
    checkbuffer(LS, l);
    switch (LS->current) {
      case EOZ:
        save(LS, '\0', l);
        luaX_lexerror(LS, (seminfo) ? "unfinished long string" :
                                   "unfinished long comment", TK_EOS);
        break;  /* to avoid warnings */
      case '[':
        save_and_next(LS, l);
        if (LS->current == '[') {
          cont++;
          save_and_next(LS, l);
        }
        continue;
      case ']':
        save_and_next(LS, l);
        if (LS->current == ']') {
          if (cont == 0) goto endloop;
          cont--;
          save_and_next(LS, l);
        }
        continue;
      case '\n':
        save(LS, '\n', l);
        inclinenumber(LS);
        if (!seminfo) l = 0;  /* reset buffer to avoid wasting space */
        continue;
      default:
        save_and_next(LS, l);
    }
  } endloop:
  save_and_next(LS, l);  /* skip the second `]' */
  save(LS, '\0', l);
  if (seminfo)
    seminfo->ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff) + 2, l - 5);
}
Exemplo n.º 8
0
static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
    int line = ls->linenumber;  /* initial line (for error message) */
    save_and_next(ls);  /* skip 2nd '[' */
    if (currIsNewline(ls))  /* string starts with a newline? */
        inclinenumber(ls);  /* skip it */
    for (;;) {
        switch (ls->current) {
        case EOZ: {  /* error */
            const char *what = (seminfo ? "string" : "comment");
            const char *msg = luaO_pushfstring(ls->L,
                                               "unfinished long %s (starting at line %d)", what, line);
            lexerror(ls, msg, TK_EOS);
            break;  /* to avoid warnings */
        }
        case ']': {
            if (skip_sep(ls) == sep) {
                save_and_next(ls);  /* skip 2nd ']' */
                goto endloop;
            }
            break;
        }
        case '\n':
        case '\r': {
            save(ls, '\n');
            inclinenumber(ls);
            if (!seminfo) luaZ_resetbuffer(ls->buff);  /* avoid wasting space */
            break;
        }
        default: {
            if (seminfo) save_and_next(ls);
            else next(ls);
        }
        }
    }
endloop:
    if (seminfo)
        seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + (2 + sep),
                                     luaZ_bufflen(ls->buff) - 2*(2 + sep));
}
Exemplo n.º 9
0
static int llex (LexState *ls, SemInfo *seminfo) {
  luaZ_resetbuffer(ls->buff);
  for (;;) {
    switch (ls->current) {
      case '\n': case '\r': {  /* line breaks */
        inclinenumber(ls);
        break;
      }
      case ' ': case '\f': case '\t': case '\v': {  /* spaces */
        next(ls);
        break;
      }
      case '-': {  /* '-' or '--' (comment) */
        next(ls);
        if (ls->current != '-') return '-';
        /* else is a comment */
        next(ls);
        if (ls->current == '[') {  /* long comment? */
          int sep = skip_sep(ls);
          luaZ_resetbuffer(ls->buff);  /* 'skip_sep' may dirty the buffer */
          if (sep >= 0) {
            read_long_string(ls, NULL, sep);  /* skip long comment */
            luaZ_resetbuffer(ls->buff);  /* previous call may dirty the buff. */
            break;
          }
        }
        /* else short comment */
        while (!currIsNewline(ls) && ls->current != EOZ)
          next(ls);  /* skip until end of line (or end of file) */
        break;
      }
      case '[': {  /* long string or simply '[' */
        int sep = skip_sep(ls);
        if (sep >= 0) {
          read_long_string(ls, seminfo, sep);
          return TK_STRING;
        }
        else if (sep != -1)  /* '[=...' missing second bracket */
          lexerror(ls, "invalid long string delimiter", TK_STRING);
        return '[';
      }
      case '=': {
        next(ls);
        if (check_next1(ls, '=')) return TK_EQ;
        else return '=';
      }
      case '<': {
        next(ls);
        if (check_next1(ls, '=')) return TK_LE;
        else if (check_next1(ls, '<')) return TK_SHL;
        else return '<';
      }
      case '>': {
        next(ls);
        if (check_next1(ls, '=')) return TK_GE;
        else if (check_next1(ls, '>')) return TK_SHR;
        else return '>';
      }
      case '/': {
        next(ls);
        if (check_next1(ls, '/')) return TK_IDIV;
        else return '/';
      }
      case '~': {
        next(ls);
        if (check_next1(ls, '=')) return TK_NE;
        else return '~';
      }
      case ':': {
        next(ls);
        if (check_next1(ls, ':')) return TK_DBCOLON;
        else return ':';
      }
      case '"': case '\'': {  /* short literal strings */
        read_string(ls, ls->current, seminfo);
        return TK_STRING;
      }
      case '`': {  /* relative paths */
        read_string(ls, ls->current, seminfo);
        return TK_PATH;
      }
      case '.': {  /* '.', '..', '...', or number */
        save_and_next(ls);
        if (check_next1(ls, '.')) {
          if (check_next1(ls, '.'))
            return TK_DOTS;   /* '...' */
          else return TK_CONCAT;   /* '..' */
        }
        else if (!lisdigit(ls->current)) return '.';
        else return read_numeral(ls, seminfo);
      }
      case '0': case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9': {
        return read_numeral(ls, seminfo);
      }
      case EOZ: {
        return TK_EOS;
      }
      default: {
        if (lislalpha(ls->current)) {  /* identifier or reserved word? */
          TString *ts;
          do {
            save_and_next(ls);
          } while (lislalnum(ls->current));
          ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
                                  luaZ_bufflen(ls->buff));
          seminfo->ts = ts;
          if (isreserved(ts))  /* reserved word? */
            return ts->extra - 1 + FIRST_RESERVED;
          else {
            return TK_NAME;
          }
        }
        else {  /* single-char tokens (+ - / ...) */
          int c = ls->current;
          next(ls);
          return c;
        }
      }
    }
  }
}
Exemplo n.º 10
0
static void read_string (LexState *ls, int del, SemInfo *seminfo) {
  save_and_next(ls);  /* keep delimiter (for error messages) */
  while (ls->current != del) {
    switch (ls->current) {
      case EOZ:
        lexerror(ls, "unfinished string", TK_EOS);
        break;  /* to avoid warnings */
      case '\n':
      case '\r':
        lexerror(ls, "unfinished string", TK_STRING);
        break;  /* to avoid warnings */
      case '\\': {  /* escape sequences */
        int c;  /* final character to be saved */
        save_and_next(ls);  /* keep '\\' for error messages */
        switch (ls->current) {
          case 'a': c = '\a'; goto read_save;
          case 'b': c = '\b'; goto read_save;
          case 'f': c = '\f'; goto read_save;
          case 'n': c = '\n'; goto read_save;
          case 'r': c = '\r'; goto read_save;
          case 't': c = '\t'; goto read_save;
          case 'v': c = '\v'; goto read_save;
          case 'x': c = readhexaesc(ls); goto read_save;
          case 'u': utf8esc(ls);  goto no_save;
          case '\n': case '\r':
            inclinenumber(ls); c = '\n'; goto only_save;
          case '\\': case '\"': case '\'':
            c = ls->current; goto read_save;
          case EOZ: goto no_save;  /* will raise an error next loop */
          case 'z': {  /* zap following span of spaces */
            luaZ_buffremove(ls->buff, 1);  /* remove '\\' */
            next(ls);  /* skip the 'z' */
            while (lisspace(ls->current)) {
              if (currIsNewline(ls)) inclinenumber(ls);
              else next(ls);
            }
            goto no_save;
          }
          default: {
            esccheck(ls, lisdigit(ls->current), "invalid escape sequence");
            c = readdecesc(ls);  /* digital escape '\ddd' */
            goto only_save;
          }
        }
       read_save:
         next(ls);
         /* go through */
       only_save:
         luaZ_buffremove(ls->buff, 1);  /* remove '\\' */
         save(ls, c);
         /* go through */
       no_save: break;
      }
      default:
        save_and_next(ls);
    }
  }
  save_and_next(ls);  /* skip delimiter */
  seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,
                                   luaZ_bufflen(ls->buff) - 2);
}
Exemplo n.º 11
0
int luaX_lex (LexState *LS, SemInfo *seminfo) {
  for (;;) {
    switch (LS->current) {

      case '\n': {
        inclinenumber(LS);
        continue;
      }
      case '-': {
        next(LS);
        if (LS->current != '-') return '-';
        /* else is a comment */
        next(LS);
        if (LS->current == '[' && (next(LS), LS->current == '['))
          read_long_string(LS, NULL);  /* long comment */
        else  /* short comment */
          while (LS->current != '\n' && LS->current != EOZ)
            next(LS);
        continue;
      }
      case '[': {
        next(LS);
        if (LS->current != '[') return '[';
        else {
          read_long_string(LS, seminfo);
          return TK_STRING;
        }
      }
      case '=': {
        next(LS);
        if (LS->current != '=') return '=';
        else { next(LS); return TK_EQ; }
      }
      case '<': {
        next(LS);
		if (LS->current == '<') { next(LS); return TK_SHL; }
        else if (LS->current != '=') return '<';
        else { next(LS); return TK_LE; }
      }
      case '>': {
        next(LS);
		if (LS->current == '>') { next(LS); return TK_SHR; }
        else if (LS->current != '=') return '>';
        else { next(LS); return TK_GE; }
      }
      case '~': {
        next(LS);
        if (LS->current != '=') return '~';
        else { next(LS); return TK_NE; }
      }
      case '"':
      case '\'': {
        read_string(LS, LS->current, seminfo);
        return TK_STRING;
      }
      case '.': {
        next(LS);
        if (LS->current == '.') {
          next(LS);
          if (LS->current == '.') {
            next(LS);
            return TK_DOTS;   /* ... */
          }
          else return TK_CONCAT;   /* .. */
        }
        else if (!lex_isdigit(LS->current)) return '.';
        else {
          return read_numeral(LS, 1, seminfo);
        }
      }
      case EOZ: {
        return TK_EOS;
      }
      default: {
        if (isspace(LS->current)) {
          next(LS);
          continue;
        }
        else if (lex_isdigit(LS->current)) {
          return (read_numeral(LS, 0, seminfo));
        }
        else if (lex_isalpha(LS->current) || LS->current == '_') {
		  char saveCh = 0;
		  size_t l;
		  TString *ts;
		  if (LS->current == 'L')
		  {
			  next(LS);
			  if (LS->current == '"')
			  {
				  read_wstring(LS, LS->current, seminfo);
				  return TK_WSTRING;
			  }
			  saveCh = 'L';
		  }
          /* identifier or reserved word */
          l = readname(LS, saveCh);
          ts = luaS_newlstr(LS->L, luaZ_buffer(LS->buff), l);
          if (ts->tsv.reserved > 0)  /* reserved word? */
            return ts->tsv.reserved - 1 + FIRST_RESERVED;
          seminfo->ts = ts;
          return TK_NAME;
        }
        else {
          int c = LS->current;
          if (iscntrl(c))
            luaX_error(LS, "invalid control char",
                           luaO_pushfstring(LS->L, "char(%d)", c));
          next(LS);
          return c;  /* single-char tokens (+ - / ...) */
        }
      }
    }
  }
}
Exemplo n.º 12
0
static void read_wstring (LexState *LS, int del, SemInfo *seminfo) {
  size_t l = 0;
  checkbuffer(LS, l * 2);
  wsave_and_next(LS, l);
  while (LS->current != del) {
    checkbuffer(LS, l * 2);
    switch (LS->current) {
      case EOZ:
        wsave(LS, '\0', l);
        luaX_lexerror(LS, "unfinished string", TK_EOS);
        break;  /* to avoid warnings */
      case '\n':
        wsave(LS, '\0', l);
        luaX_lexerror(LS, "unfinished string", TK_STRING);
        break;  /* to avoid warnings */
      case '\\':
        next(LS);  /* do not save the `\' */
        switch (LS->current) {
          case 'a': wsave(LS, '\a', l); next(LS); break;
          case 'b': wsave(LS, '\b', l); next(LS); break;
          case 'f': wsave(LS, '\f', l); next(LS); break;
          case 'n': wsave(LS, '\n', l); next(LS); break;
          case 'r': wsave(LS, '\r', l); next(LS); break;
          case 't': wsave(LS, '\t', l); next(LS); break;
          case 'v': wsave(LS, '\v', l); next(LS); break;
          case '\n': wsave(LS, '\n', l); inclinenumber(LS); break;
          case EOZ: break;  /* will raise an error next loop */
          case 'x': {
			  int ch;
			  next(LS);
			  ch = tolower(LS->current);
              if (!lex_isdigit(ch) && !(ch >= 'a' && ch <= 'f') )
		          save(LS, 'x', l);  /* handles \\, \", \', and \? */
			  else {  /* \xxx */
				  int c = 0;
				  int i = 0;
				  int numDigits = 4;
				  do {
					  ch = tolower(LS->current);
					  if (lex_isdigit(ch))
					    c = 16*c + (ch-'0');
					  else if (ch >= 'a' && ch <= 'f')
						c = 16*c + (ch-'a') + 10;
					  next(LS);
					  ch = tolower(LS->current);
				  } while (++i<numDigits && (lex_isdigit(ch) || (ch >= 'a' && ch <= 'f')));
				  wsave(LS, c, l);
			  }
			  break;
          }
          default: {
            if (!lex_isdigit(LS->current))
              wsave_and_next(LS, l);  /* handles \\, \", \', and \? */
            else {  /* \xxx */
              int c = 0;
              int i = 0;
              do {
                c = 10*c + (LS->current-'0');
                next(LS);
              } while (++i<3 && lex_isdigit(LS->current));
              if (c > UCHAR_MAX) {
                wsave(LS, '\0', l);
                luaX_lexerror(LS, "escape sequence too large", TK_STRING);
              }
              wsave(LS, c, l);
            }
          }
        }
        break;
      default:
        wsave_and_next(LS, l);
    }
  }
  wsave_and_next(LS, l);  /* skip delimiter */
  wsave(LS, '\0', l);
  seminfo->ts = luaS_newlwstr(LS->L, (const lua_WChar*)(luaZ_buffer(LS->buff) + 1 * 2), (l - 3 * 2) / 2);
}
Exemplo n.º 13
0
/* LUA_NUMBER */
static int read_numeral (LexState *LS, int period, SemInfo *seminfo) {
  int isReal = 0;
  int startsWithZero = LS->current == '0';
  size_t l = 0;
  checkbuffer(LS, l);
  if (period) {
	save(LS, '.', l);
	isReal = 1;
  }
  if (startsWithZero) {
	next(LS);
	if (LS->current == 'x') {
	  /* Process a hex number */
	  int ch = 0;
      int c = 0;
      int i = 0;
      int numDigits = 8;
	  next(LS);
      do {
        ch = tolower(LS->current);
        if (lex_isdigit(ch))
          c = 16*c + (ch-'0');
        else if (ch >= 'a' && ch <= 'f')
          c = 16*c + (ch-'a') + 10;
        next(LS);
        ch = tolower(LS->current);
      } while (++i<numDigits && (lex_isdigit(ch) || (ch >= 'a' && ch <= 'f')));
	  seminfo->r = c;
	  return TK_NUMBER;
	} else {
      checkbuffer(LS, 1);
      save(LS, '0', l);
	}
  }
  while (lex_isdigit(LS->current)) {
    checkbuffer(LS, l);
    save_and_next(LS, l);
  }
  if (LS->current == '.') {
    isReal = 1;
    save_and_next(LS, l);
    if (LS->current == '.') {
      save_and_next(LS, l);
      save(LS, '\0', l);
      luaX_lexerror(LS,
                 "ambiguous syntax (decimal point x string concatenation)",
                 TK_NUMBER);
    }
  }
  while (lex_isdigit(LS->current)) {
    checkbuffer(LS, l);
    save_and_next(LS, l);
  }
  if (LS->current == 'e' || LS->current == 'E') {
    isReal = 1;
    save_and_next(LS, l);  /* read `E' */
    if (LS->current == '+' || LS->current == '-')
      save_and_next(LS, l);  /* optional exponent sign */
    while (lex_isdigit(LS->current)) {
      checkbuffer(LS, l);
      save_and_next(LS, l);
    }
  }
  save(LS, '\0', l);
  if (isReal) {
    if (!luaO_str2d(luaZ_buffer(LS->buff), &seminfo->r))
      luaX_lexerror(LS, "malformed number", TK_NUMBER);
	return TK_NUMBER;
  } else {
    if (!luaO_str2d(luaZ_buffer(LS->buff), &seminfo->r))
      luaX_lexerror(LS, "malformed integer", TK_NUMBER);
	return TK_NUMBER;
  }
}
Exemplo n.º 14
0
static void luaX_lexerror (LexState *ls, const char *s, int token) {
  if (token == TK_EOS)
    luaX_error(ls, s, luaX_token2str(ls, token));
  else
    luaX_error(ls, s, luaZ_buffer(ls->buff));
}