1997-09-17 03:25:59 +08:00
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/*
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2009-02-20 01:33:51 +08:00
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** $Id: llex.c,v 2.30 2009/02/11 18:25:20 roberto Exp roberto $
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1999-02-26 05:07:26 +08:00
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** Lexical Analyzer
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1997-09-17 03:25:59 +08:00
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** See Copyright Notice in lua.h
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*/
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1996-05-30 22:04:07 +08:00
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1993-12-23 05:15:16 +08:00
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2005-12-07 23:33:27 +08:00
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#include <locale.h>
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1993-12-29 00:42:29 +08:00
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#include <string.h>
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1993-12-23 05:15:16 +08:00
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2002-12-05 01:38:31 +08:00
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#define llex_c
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2004-05-01 04:13:38 +08:00
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#define LUA_CORE
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2002-12-05 01:38:31 +08:00
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2000-06-12 21:52:05 +08:00
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#include "lua.h"
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2009-02-20 01:33:51 +08:00
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#include "lctype.h"
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2002-05-08 01:36:56 +08:00
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#include "ldo.h"
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1997-09-17 03:25:59 +08:00
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#include "llex.h"
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#include "lobject.h"
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#include "lparser.h"
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1997-11-20 01:29:23 +08:00
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#include "lstate.h"
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1997-09-17 03:25:59 +08:00
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#include "lstring.h"
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2006-03-10 02:15:48 +08:00
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#include "ltable.h"
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1997-09-17 03:25:59 +08:00
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#include "lzio.h"
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1993-12-23 05:15:16 +08:00
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1995-09-16 04:48:26 +08:00
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1996-05-30 22:04:07 +08:00
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2003-08-28 22:38:46 +08:00
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#define next(ls) (ls->current = zgetc(ls->z))
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1997-09-17 03:25:59 +08:00
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2003-10-04 00:05:34 +08:00
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1997-09-17 03:25:59 +08:00
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2003-08-28 22:38:46 +08:00
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#define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r')
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2003-08-21 22:16:43 +08:00
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1998-05-27 21:08:34 +08:00
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1999-07-23 03:29:42 +08:00
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/* ORDER RESERVED */
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2007-02-08 01:49:18 +08:00
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static const char *const luaX_tokens [] = {
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2001-11-29 04:13:13 +08:00
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"and", "break", "do", "else", "elseif",
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2002-09-03 19:57:38 +08:00
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"end", "false", "for", "function", "if",
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2001-11-29 04:13:13 +08:00
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"in", "local", "nil", "not", "or", "repeat",
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2004-12-04 04:54:12 +08:00
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"return", "then", "true", "until", "while",
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2007-02-08 01:49:18 +08:00
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"..", "...", "==", ">=", "<=", "~=", "<eof>",
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"<number>", "<name>", "<string>"
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2001-02-24 01:17:25 +08:00
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};
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1998-05-27 21:08:34 +08:00
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1997-09-17 03:25:59 +08:00
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2004-12-01 23:46:18 +08:00
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#define save_and_next(ls) (save(ls, ls->current), next(ls))
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2007-10-26 00:45:47 +08:00
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static void lexerror (LexState *ls, const char *msg, int token);
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2004-12-01 23:46:18 +08:00
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static void save (LexState *ls, int c) {
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Mbuffer *b = ls->buff;
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if (b->n + 1 > b->buffsize) {
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size_t newsize;
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if (b->buffsize >= MAX_SIZET/2)
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2007-10-26 00:45:47 +08:00
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lexerror(ls, "lexical element too long", 0);
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2004-12-01 23:46:18 +08:00
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newsize = b->buffsize * 2;
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luaZ_resizebuffer(ls->L, b, newsize);
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}
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b->buffer[b->n++] = cast(char, c);
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}
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1999-11-22 21:12:07 +08:00
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void luaX_init (lua_State *L) {
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2000-03-03 22:58:26 +08:00
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int i;
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2000-02-09 00:39:42 +08:00
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for (i=0; i<NUM_RESERVED; i++) {
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2004-12-02 20:59:10 +08:00
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TString *ts = luaS_new(L, luaX_tokens[i]);
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2002-08-16 22:45:55 +08:00
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luaS_fix(ts); /* reserved words are never collected */
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2004-12-02 20:59:10 +08:00
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lua_assert(strlen(luaX_tokens[i])+1 <= TOKEN_LEN);
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2005-12-23 00:19:56 +08:00
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ts->tsv.reserved = cast_byte(i+1); /* reserved word */
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1998-05-27 21:08:34 +08:00
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}
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}
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2003-09-05 04:00:28 +08:00
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const char *luaX_token2str (LexState *ls, int token) {
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if (token < FIRST_RESERVED) {
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2004-11-25 03:16:03 +08:00
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lua_assert(token == cast(unsigned char, token));
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2009-02-20 01:33:51 +08:00
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return (lisprint(token)) ? luaO_pushfstring(ls->L, LUA_QL("%c"), token) :
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2007-08-10 04:29:15 +08:00
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luaO_pushfstring(ls->L, "char(%d)", token);
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2007-02-08 01:49:18 +08:00
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}
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else {
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const char *s = luaX_tokens[token - FIRST_RESERVED];
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if (token < TK_EOS)
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return luaO_pushfstring(ls->L, LUA_QS, s);
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else
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return s;
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2003-09-05 04:00:28 +08:00
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}
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}
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static const char *txtToken (LexState *ls, int token) {
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switch (token) {
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2002-05-08 01:36:56 +08:00
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case TK_NAME:
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case TK_STRING:
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case TK_NUMBER:
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2003-08-28 22:38:46 +08:00
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save(ls, '\0');
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2007-02-08 01:49:18 +08:00
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return luaO_pushfstring(ls->L, LUA_QS, luaZ_buffer(ls->buff));
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2002-05-08 01:36:56 +08:00
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default:
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2003-09-05 04:00:28 +08:00
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return luaX_token2str(ls, token);
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1997-09-17 03:25:59 +08:00
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}
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1998-05-27 21:08:34 +08:00
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}
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2007-10-26 00:45:47 +08:00
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static void lexerror (LexState *ls, const char *msg, int token) {
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2008-12-26 19:55:57 +08:00
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char buff[LUA_IDSIZE];
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luaO_chunkid(buff, getstr(ls->source), LUA_IDSIZE);
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2004-03-13 03:53:56 +08:00
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msg = luaO_pushfstring(ls->L, "%s:%d: %s", buff, ls->linenumber, msg);
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if (token)
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2007-02-08 01:49:18 +08:00
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luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token));
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2003-10-20 20:24:34 +08:00
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luaD_throw(ls->L, LUA_ERRSYNTAX);
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2001-11-17 00:29:10 +08:00
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}
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2003-09-05 04:00:28 +08:00
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void luaX_syntaxerror (LexState *ls, const char *msg) {
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2007-10-26 00:45:47 +08:00
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lexerror(ls, msg, ls->t.token);
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1997-09-17 03:25:59 +08:00
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}
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1997-04-12 23:01:49 +08:00
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2003-08-28 22:38:46 +08:00
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TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
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lua_State *L = ls->L;
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2006-07-11 23:53:29 +08:00
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TValue *o; /* entry for `str' */
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2003-08-28 05:01:44 +08:00
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TString *ts = luaS_newlstr(L, str, l);
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2006-07-11 23:53:29 +08:00
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setsvalue2s(L, L->top++, ts); /* anchor string */
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o = luaH_setstr(L, ls->fs->h, ts);
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2003-08-28 05:01:44 +08:00
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if (ttisnil(o))
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setbvalue(o, 1); /* make sure `str' will not be collected */
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2006-07-11 23:53:29 +08:00
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L->top--;
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2003-08-28 05:01:44 +08:00
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return ts;
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}
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2003-08-28 22:38:46 +08:00
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static void inclinenumber (LexState *ls) {
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int old = ls->current;
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lua_assert(currIsNewline(ls));
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next(ls); /* skip `\n' or `\r' */
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if (currIsNewline(ls) && ls->current != old)
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next(ls); /* skip `\n\r' or `\r\n' */
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2004-03-13 03:53:56 +08:00
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if (++ls->linenumber >= MAX_INT)
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luaX_syntaxerror(ls, "chunk has too many lines");
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2000-05-26 22:04:04 +08:00
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}
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2003-08-28 22:38:46 +08:00
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void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
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2005-12-08 23:50:54 +08:00
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ls->decpoint = '.';
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2003-08-28 22:38:46 +08:00
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ls->L = L;
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ls->lookahead.token = TK_EOS; /* no look-ahead token */
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ls->z = z;
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ls->fs = NULL;
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ls->linenumber = 1;
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ls->lastline = 1;
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ls->source = source;
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2004-12-01 23:46:18 +08:00
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luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
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2003-08-28 22:38:46 +08:00
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next(ls); /* read first char */
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2000-05-26 22:04:04 +08:00
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}
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1998-12-28 04:25:20 +08:00
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1997-09-17 03:25:59 +08:00
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/*
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** =======================================================
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1999-12-15 02:33:29 +08:00
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** LEXICAL ANALYZER
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1997-09-17 03:25:59 +08:00
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** =======================================================
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*/
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2000-09-12 01:38:42 +08:00
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2005-11-09 03:45:14 +08:00
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static int check_next (LexState *ls, const char *set) {
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2006-09-19 00:06:41 +08:00
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if (ls->current == '\0' || !strchr(set, ls->current))
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2005-11-09 03:45:14 +08:00
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return 0;
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save_and_next(ls);
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return 1;
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}
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2005-12-08 23:50:54 +08:00
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static void buffreplace (LexState *ls, char from, char to) {
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2006-02-07 02:28:16 +08:00
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size_t n = luaZ_bufflen(ls->buff);
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2005-12-07 23:33:27 +08:00
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char *p = luaZ_buffer(ls->buff);
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while (n--)
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if (p[n] == from) p[n] = to;
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}
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2003-08-28 22:38:46 +08:00
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2007-09-14 21:27:04 +08:00
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#if !defined(getlocaledecpoint)
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#define getlocaledecpoint() (localeconv()->decimal_point[0])
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#endif
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2005-12-08 23:50:54 +08:00
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static void trydecpoint (LexState *ls, SemInfo *seminfo) {
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/* format error: try to update decimal point separator */
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char old = ls->decpoint;
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2007-09-14 21:27:04 +08:00
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ls->decpoint = getlocaledecpoint();
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2005-12-08 23:50:54 +08:00
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buffreplace(ls, old, ls->decpoint); /* try updated decimal separator */
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if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) {
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/* format error with correct decimal point: no more options */
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buffreplace(ls, ls->decpoint, '.'); /* undo change (for error message) */
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2007-10-26 00:45:47 +08:00
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lexerror(ls, "malformed number", TK_NUMBER);
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2005-12-08 23:50:54 +08:00
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}
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}
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2000-09-12 01:38:42 +08:00
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/* LUA_NUMBER */
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2003-08-28 22:38:46 +08:00
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static void read_numeral (LexState *ls, SemInfo *seminfo) {
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2009-02-20 01:33:51 +08:00
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lua_assert(lisdigit(ls->current));
|
2005-11-09 03:45:14 +08:00
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do {
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2003-08-28 22:38:46 +08:00
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save_and_next(ls);
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2009-02-20 01:33:51 +08:00
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} while (lisdigit(ls->current) || ls->current == '.');
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2006-01-24 04:06:19 +08:00
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if (check_next(ls, "Ee")) /* `E'? */
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2005-11-09 03:45:14 +08:00
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check_next(ls, "+-"); /* optional exponent sign */
|
2009-02-20 01:33:51 +08:00
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while (lisalnum(ls->current) || ls->current == '_')
|
2006-01-24 04:06:19 +08:00
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save_and_next(ls);
|
2003-08-28 22:38:46 +08:00
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save(ls, '\0');
|
2005-12-08 23:50:54 +08:00
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buffreplace(ls, '.', ls->decpoint); /* follow locale for decimal point */
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if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) /* format error? */
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trydecpoint(ls, seminfo); /* try to update decimal point separator */
|
2000-09-12 01:38:42 +08:00
|
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}
|
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2004-09-22 22:02:00 +08:00
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static int skip_sep (LexState *ls) {
|
2003-08-30 00:48:14 +08:00
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int count = 0;
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int s = ls->current;
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lua_assert(s == '[' || s == ']');
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save_and_next(ls);
|
2004-09-22 22:02:00 +08:00
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while (ls->current == '=') {
|
2003-08-30 00:48:14 +08:00
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save_and_next(ls);
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count++;
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}
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return (ls->current == s) ? count : (-count) - 1;
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}
|
|
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|
2004-09-22 22:02:00 +08:00
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static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
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2003-08-30 00:48:14 +08:00
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save_and_next(ls); /* skip 2nd `[' */
|
2003-08-28 22:38:46 +08:00
|
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if (currIsNewline(ls)) /* string starts with a newline? */
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inclinenumber(ls); /* skip it */
|
1998-12-03 23:45:15 +08:00
|
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for (;;) {
|
2003-08-28 22:38:46 +08:00
|
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switch (ls->current) {
|
1997-06-17 00:50:22 +08:00
|
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case EOZ:
|
2007-10-26 00:45:47 +08:00
|
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lexerror(ls, (seminfo) ? "unfinished long string" :
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"unfinished long comment", TK_EOS);
|
2000-01-26 02:44:21 +08:00
|
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|
break; /* to avoid warnings */
|
2005-04-28 02:37:51 +08:00
|
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|
case ']': {
|
2004-09-22 22:02:00 +08:00
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|
if (skip_sep(ls) == sep) {
|
2003-08-30 00:48:14 +08:00
|
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|
save_and_next(ls); /* skip 2nd `]' */
|
2005-04-28 02:37:51 +08:00
|
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goto endloop;
|
1995-07-07 01:47:08 +08:00
|
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|
}
|
2005-04-28 02:37:51 +08:00
|
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|
break;
|
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|
}
|
2001-11-29 04:13:13 +08:00
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|
case '\n':
|
2005-04-28 02:37:51 +08:00
|
|
|
case '\r': {
|
2003-08-28 22:38:46 +08:00
|
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|
save(ls, '\n');
|
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|
inclinenumber(ls);
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if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */
|
2005-04-28 02:37:51 +08:00
|
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|
break;
|
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|
}
|
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|
default: {
|
2003-08-28 22:38:46 +08:00
|
|
|
if (seminfo) save_and_next(ls);
|
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|
else next(ls);
|
2005-04-28 02:37:51 +08:00
|
|
|
}
|
1995-07-07 01:47:08 +08:00
|
|
|
}
|
1996-05-30 22:04:07 +08:00
|
|
|
} endloop:
|
2002-03-09 03:07:01 +08:00
|
|
|
if (seminfo)
|
2004-09-22 22:02:00 +08:00
|
|
|
seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + (2 + sep),
|
|
|
|
luaZ_bufflen(ls->buff) - 2*(2 + sep));
|
2000-01-26 02:44:21 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2003-08-28 22:38:46 +08:00
|
|
|
static void read_string (LexState *ls, int del, SemInfo *seminfo) {
|
|
|
|
save_and_next(ls);
|
|
|
|
while (ls->current != del) {
|
|
|
|
switch (ls->current) {
|
2002-05-08 01:36:56 +08:00
|
|
|
case EOZ:
|
2007-10-26 00:45:47 +08:00
|
|
|
lexerror(ls, "unfinished string", TK_EOS);
|
2003-08-28 22:38:46 +08:00
|
|
|
continue; /* to avoid warnings */
|
2002-05-08 01:36:56 +08:00
|
|
|
case '\n':
|
2003-08-21 22:16:43 +08:00
|
|
|
case '\r':
|
2007-10-26 00:45:47 +08:00
|
|
|
lexerror(ls, "unfinished string", TK_STRING);
|
2003-08-28 22:38:46 +08:00
|
|
|
continue; /* to avoid warnings */
|
|
|
|
case '\\': {
|
|
|
|
int c;
|
|
|
|
next(ls); /* do not save the `\' */
|
|
|
|
switch (ls->current) {
|
|
|
|
case 'a': c = '\a'; break;
|
|
|
|
case 'b': c = '\b'; break;
|
|
|
|
case 'f': c = '\f'; break;
|
|
|
|
case 'n': c = '\n'; break;
|
|
|
|
case 'r': c = '\r'; break;
|
|
|
|
case 't': c = '\t'; break;
|
|
|
|
case 'v': c = '\v'; break;
|
2009-02-12 02:25:20 +08:00
|
|
|
case '\n':
|
2003-08-28 22:38:46 +08:00
|
|
|
case '\r': save(ls, '\n'); inclinenumber(ls); continue;
|
|
|
|
case EOZ: continue; /* will raise an error next loop */
|
2001-02-24 01:17:25 +08:00
|
|
|
default: {
|
2009-02-20 01:33:51 +08:00
|
|
|
if (!lisdigit(ls->current))
|
2003-08-28 22:38:46 +08:00
|
|
|
save_and_next(ls); /* handles \\, \", \', and \? */
|
2001-02-24 01:17:25 +08:00
|
|
|
else { /* \xxx */
|
|
|
|
int i = 0;
|
2003-08-28 22:38:46 +08:00
|
|
|
c = 0;
|
2001-02-24 01:17:25 +08:00
|
|
|
do {
|
2003-08-28 22:38:46 +08:00
|
|
|
c = 10*c + (ls->current-'0');
|
|
|
|
next(ls);
|
2009-02-20 01:33:51 +08:00
|
|
|
} while (++i<3 && lisdigit(ls->current));
|
2003-08-28 22:38:46 +08:00
|
|
|
if (c > UCHAR_MAX)
|
2007-10-26 00:45:47 +08:00
|
|
|
lexerror(ls, "escape sequence too large", TK_STRING);
|
2003-08-28 22:38:46 +08:00
|
|
|
save(ls, c);
|
2000-09-12 01:38:42 +08:00
|
|
|
}
|
2003-08-28 22:38:46 +08:00
|
|
|
continue;
|
2000-01-26 02:44:21 +08:00
|
|
|
}
|
|
|
|
}
|
2003-08-28 22:38:46 +08:00
|
|
|
save(ls, c);
|
|
|
|
next(ls);
|
|
|
|
continue;
|
|
|
|
}
|
2000-01-26 02:44:21 +08:00
|
|
|
default:
|
2003-08-28 22:38:46 +08:00
|
|
|
save_and_next(ls);
|
2000-01-26 02:44:21 +08:00
|
|
|
}
|
|
|
|
}
|
2003-08-28 22:38:46 +08:00
|
|
|
save_and_next(ls); /* skip delimiter */
|
|
|
|
seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,
|
|
|
|
luaZ_bufflen(ls->buff) - 2);
|
1995-07-07 01:47:08 +08:00
|
|
|
}
|
|
|
|
|
1997-09-17 03:25:59 +08:00
|
|
|
|
2005-12-07 23:43:05 +08:00
|
|
|
static int llex (LexState *ls, SemInfo *seminfo) {
|
2003-08-28 22:38:46 +08:00
|
|
|
luaZ_resetbuffer(ls->buff);
|
1998-12-03 23:45:15 +08:00
|
|
|
for (;;) {
|
2003-08-28 22:38:46 +08:00
|
|
|
switch (ls->current) {
|
2003-08-21 22:16:43 +08:00
|
|
|
case '\n':
|
|
|
|
case '\r': {
|
2003-08-28 22:38:46 +08:00
|
|
|
inclinenumber(ls);
|
1998-01-09 22:44:55 +08:00
|
|
|
continue;
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '-': {
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
|
|
|
if (ls->current != '-') return '-';
|
2002-03-09 03:07:01 +08:00
|
|
|
/* else is a comment */
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
2003-08-30 00:48:14 +08:00
|
|
|
if (ls->current == '[') {
|
2004-09-22 22:02:00 +08:00
|
|
|
int sep = skip_sep(ls);
|
|
|
|
luaZ_resetbuffer(ls->buff); /* `skip_sep' may dirty the buffer */
|
|
|
|
if (sep >= 0) {
|
|
|
|
read_long_string(ls, NULL, sep); /* long comment */
|
2003-08-30 00:48:14 +08:00
|
|
|
luaZ_resetbuffer(ls->buff);
|
|
|
|
continue;
|
|
|
|
}
|
2003-08-28 22:38:46 +08:00
|
|
|
}
|
2003-08-30 00:48:14 +08:00
|
|
|
/* else short comment */
|
|
|
|
while (!currIsNewline(ls) && ls->current != EOZ)
|
|
|
|
next(ls);
|
1993-12-23 05:15:16 +08:00
|
|
|
continue;
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '[': {
|
2004-09-22 22:02:00 +08:00
|
|
|
int sep = skip_sep(ls);
|
|
|
|
if (sep >= 0) {
|
|
|
|
read_long_string(ls, seminfo, sep);
|
2000-03-11 02:37:44 +08:00
|
|
|
return TK_STRING;
|
1995-07-07 01:47:08 +08:00
|
|
|
}
|
2004-09-22 22:02:00 +08:00
|
|
|
else if (sep == -1) return '[';
|
2007-10-26 00:45:47 +08:00
|
|
|
else lexerror(ls, "invalid long string delimiter", TK_STRING);
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '=': {
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
|
|
|
if (ls->current != '=') return '=';
|
|
|
|
else { next(ls); return TK_EQ; }
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '<': {
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
|
|
|
if (ls->current != '=') return '<';
|
|
|
|
else { next(ls); return TK_LE; }
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '>': {
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
|
|
|
if (ls->current != '=') return '>';
|
|
|
|
else { next(ls); return TK_GE; }
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '~': {
|
2003-08-28 22:38:46 +08:00
|
|
|
next(ls);
|
|
|
|
if (ls->current != '=') return '~';
|
|
|
|
else { next(ls); return TK_NE; }
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
2001-11-29 04:13:13 +08:00
|
|
|
case '"':
|
2002-06-04 04:12:21 +08:00
|
|
|
case '\'': {
|
2003-08-28 22:38:46 +08:00
|
|
|
read_string(ls, ls->current, seminfo);
|
2000-03-11 02:37:44 +08:00
|
|
|
return TK_STRING;
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case '.': {
|
2003-08-28 22:38:46 +08:00
|
|
|
save_and_next(ls);
|
2005-11-09 03:45:14 +08:00
|
|
|
if (check_next(ls, ".")) {
|
|
|
|
if (check_next(ls, "."))
|
2000-03-11 02:37:44 +08:00
|
|
|
return TK_DOTS; /* ... */
|
2000-04-07 21:11:49 +08:00
|
|
|
else return TK_CONCAT; /* .. */
|
1993-12-23 05:15:16 +08:00
|
|
|
}
|
2009-02-20 01:33:51 +08:00
|
|
|
else if (!lisdigit(ls->current)) return '.';
|
2000-09-12 01:38:42 +08:00
|
|
|
else {
|
2003-08-28 22:38:46 +08:00
|
|
|
read_numeral(ls, seminfo);
|
2000-09-12 01:38:42 +08:00
|
|
|
return TK_NUMBER;
|
|
|
|
}
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
|
|
|
case EOZ: {
|
2000-03-11 02:37:44 +08:00
|
|
|
return TK_EOS;
|
2002-06-04 04:12:21 +08:00
|
|
|
}
|
2001-02-24 01:17:25 +08:00
|
|
|
default: {
|
2009-02-20 01:33:51 +08:00
|
|
|
if (lisspace(ls->current)) {
|
2003-08-28 22:38:46 +08:00
|
|
|
lua_assert(!currIsNewline(ls));
|
|
|
|
next(ls);
|
2002-06-04 04:12:21 +08:00
|
|
|
continue;
|
|
|
|
}
|
2009-02-20 01:33:51 +08:00
|
|
|
else if (lisdigit(ls->current)) {
|
2003-08-28 22:38:46 +08:00
|
|
|
read_numeral(ls, seminfo);
|
2001-02-24 01:17:25 +08:00
|
|
|
return TK_NUMBER;
|
1997-07-02 03:32:41 +08:00
|
|
|
}
|
2009-02-20 01:33:51 +08:00
|
|
|
else if (lisalpha(ls->current) || ls->current == '_') {
|
2001-02-24 01:17:25 +08:00
|
|
|
/* identifier or reserved word */
|
2003-08-28 22:38:46 +08:00
|
|
|
TString *ts;
|
|
|
|
do {
|
|
|
|
save_and_next(ls);
|
2009-02-20 01:33:51 +08:00
|
|
|
} while (lisalnum(ls->current) || ls->current == '_');
|
2003-08-28 22:38:46 +08:00
|
|
|
ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
|
|
|
|
luaZ_bufflen(ls->buff));
|
2002-08-16 22:45:55 +08:00
|
|
|
if (ts->tsv.reserved > 0) /* reserved word? */
|
|
|
|
return ts->tsv.reserved - 1 + FIRST_RESERVED;
|
2003-09-05 04:00:28 +08:00
|
|
|
else {
|
|
|
|
seminfo->ts = ts;
|
|
|
|
return TK_NAME;
|
|
|
|
}
|
1997-07-02 03:32:41 +08:00
|
|
|
}
|
2001-02-24 01:17:25 +08:00
|
|
|
else {
|
2003-08-28 22:38:46 +08:00
|
|
|
int c = ls->current;
|
|
|
|
next(ls);
|
2001-02-24 01:17:25 +08:00
|
|
|
return c; /* single-char tokens (+ - / ...) */
|
|
|
|
}
|
|
|
|
}
|
1993-12-23 05:15:16 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
1996-05-30 22:04:07 +08:00
|
|
|
|
2005-12-07 23:43:05 +08:00
|
|
|
|
|
|
|
void luaX_next (LexState *ls) {
|
|
|
|
ls->lastline = ls->linenumber;
|
|
|
|
if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */
|
|
|
|
ls->t = ls->lookahead; /* use this one */
|
|
|
|
ls->lookahead.token = TK_EOS; /* and discharge it */
|
|
|
|
}
|
|
|
|
else
|
|
|
|
ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-05-12 01:28:56 +08:00
|
|
|
int luaX_lookahead (LexState *ls) {
|
2005-12-07 23:43:05 +08:00
|
|
|
lua_assert(ls->lookahead.token == TK_EOS);
|
|
|
|
ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
|
2007-05-12 01:28:56 +08:00
|
|
|
return ls->lookahead.token;
|
2005-12-07 23:43:05 +08:00
|
|
|
}
|
|
|
|
|