--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/liblua/llex.c Mon Feb 15 19:49:20 2010 +0000
@@ -0,0 +1,461 @@
+/*
+** $Id: llex.c,v 2.20.1.1 2007/12/27 13:02:25 roberto Exp $
+** Lexical Analyzer
+** See Copyright Notice in lua.h
+*/
+
+
+#include <ctype.h>
+#include <locale.h>
+#include <string.h>
+
+#define llex_c
+#define LUA_CORE
+
+#include "lua.h"
+
+#include "ldo.h"
+#include "llex.h"
+#include "lobject.h"
+#include "lparser.h"
+#include "lstate.h"
+#include "lstring.h"
+#include "ltable.h"
+#include "lzio.h"
+
+
+
+#define next(ls) (ls->current = zgetc(ls->z))
+
+
+
+
+#define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r')
+
+
+/* ORDER RESERVED */
+const char *const luaX_tokens [] = {
+ "and", "break", "do", "else", "elseif",
+ "end", "false", "for", "function", "if",
+ "in", "local", "nil", "not", "or", "repeat",
+ "return", "then", "true", "until", "while",
+ "..", "...", "==", ">=", "<=", "~=",
+ "<number>", "<name>", "<string>", "<eof>",
+ NULL
+};
+
+
+#define save_and_next(ls) (save(ls, ls->current), next(ls))
+
+
+static void save (LexState *ls, int c) {
+ Mbuffer *b = ls->buff;
+ if (b->n + 1 > b->buffsize) {
+ size_t newsize;
+ if (b->buffsize >= MAX_SIZET/2)
+ luaX_lexerror(ls, "lexical element too long", 0);
+ newsize = b->buffsize * 2;
+ luaZ_resizebuffer(ls->L, b, newsize);
+ }
+ b->buffer[b->n++] = cast(char, c);
+}
+
+
+void luaX_init (lua_State *L) {
+ int i;
+ for (i=0; i<NUM_RESERVED; i++) {
+ TString *ts = luaS_new(L, luaX_tokens[i]);
+ luaS_fix(ts); /* reserved words are never collected */
+ lua_assert(strlen(luaX_tokens[i])+1 <= TOKEN_LEN);
+ ts->tsv.reserved = cast_byte(i+1); /* reserved word */
+ }
+}
+
+
+#define MAXSRC 80
+
+
+const char *luaX_token2str (LexState *ls, int token) {
+ if (token < FIRST_RESERVED) {
+ lua_assert(token == cast(unsigned char, token));
+ return (iscntrl(token)) ? luaO_pushfstring(ls->L, "char(%d)", token) :
+ luaO_pushfstring(ls->L, "%c", token);
+ }
+ else
+ return luaX_tokens[token-FIRST_RESERVED];
+}
+
+
+static const char *txtToken (LexState *ls, int token) {
+ switch (token) {
+ case TK_NAME:
+ case TK_STRING:
+ case TK_NUMBER:
+ save(ls, '\0');
+ return luaZ_buffer(ls->buff);
+ default:
+ return luaX_token2str(ls, token);
+ }
+}
+
+
+void luaX_lexerror (LexState *ls, const char *msg, int token) {
+ char buff[MAXSRC];
+ luaO_chunkid(buff, getstr(ls->source), MAXSRC);
+ msg = luaO_pushfstring(ls->L, "%s:%d: %s", buff, ls->linenumber, msg);
+ if (token)
+ luaO_pushfstring(ls->L, "%s near " LUA_QS, msg, txtToken(ls, token));
+ luaD_throw(ls->L, LUA_ERRSYNTAX);
+}
+
+
+void luaX_syntaxerror (LexState *ls, const char *msg) {
+ luaX_lexerror(ls, msg, ls->t.token);
+}
+
+
+TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
+ lua_State *L = ls->L;
+ TString *ts = luaS_newlstr(L, str, l);
+ TValue *o = luaH_setstr(L, ls->fs->h, ts); /* entry for `str' */
+ if (ttisnil(o))
+ setbvalue(o, 1); /* make sure `str' will not be collected */
+ return ts;
+}
+
+
+static void inclinenumber (LexState *ls) {
+ int old = ls->current;
+ lua_assert(currIsNewline(ls));
+ next(ls); /* skip `\n' or `\r' */
+ if (currIsNewline(ls) && ls->current != old)
+ next(ls); /* skip `\n\r' or `\r\n' */
+ if (++ls->linenumber >= MAX_INT)
+ luaX_syntaxerror(ls, "chunk has too many lines");
+}
+
+
+void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
+ ls->decpoint = '.';
+ ls->L = L;
+ ls->lookahead.token = TK_EOS; /* no look-ahead token */
+ ls->z = z;
+ ls->fs = NULL;
+ ls->linenumber = 1;
+ ls->lastline = 1;
+ ls->source = source;
+ luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
+ next(ls); /* read first char */
+}
+
+
+
+/*
+** =======================================================
+** LEXICAL ANALYZER
+** =======================================================
+*/
+
+
+
+static int check_next (LexState *ls, const char *set) {
+ if (!strchr(set, ls->current))
+ return 0;
+ save_and_next(ls);
+ return 1;
+}
+
+
+static void buffreplace (LexState *ls, char from, char to) {
+ size_t n = luaZ_bufflen(ls->buff);
+ char *p = luaZ_buffer(ls->buff);
+ while (n--)
+ if (p[n] == from) p[n] = to;
+}
+
+
+static void trydecpoint (LexState *ls, SemInfo *seminfo) {
+ /* format error: try to update decimal point separator */
+ struct lconv *cv = localeconv();
+ char old = ls->decpoint;
+ ls->decpoint = (cv ? cv->decimal_point[0] : '.');
+ buffreplace(ls, old, ls->decpoint); /* try updated decimal separator */
+ if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) {
+ /* format error with correct decimal point: no more options */
+ buffreplace(ls, ls->decpoint, '.'); /* undo change (for error message) */
+ luaX_lexerror(ls, "malformed number", TK_NUMBER);
+ }
+}
+
+
+/* LUA_NUMBER */
+static void read_numeral (LexState *ls, SemInfo *seminfo) {
+ lua_assert(isdigit(ls->current));
+ do {
+ save_and_next(ls);
+ } while (isdigit(ls->current) || ls->current == '.');
+ if (check_next(ls, "Ee")) /* `E'? */
+ check_next(ls, "+-"); /* optional exponent sign */
+ while (isalnum(ls->current) || ls->current == '_')
+ save_and_next(ls);
+ save(ls, '\0');
+ buffreplace(ls, '.', ls->decpoint); /* follow locale for decimal point */
+ if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) /* format error? */
+ trydecpoint(ls, seminfo); /* try to update decimal point separator */
+}
+
+
+static int skip_sep (LexState *ls) {
+ int count = 0;
+ int s = ls->current;
+ lua_assert(s == '[' || s == ']');
+ save_and_next(ls);
+ while (ls->current == '=') {
+ save_and_next(ls);
+ count++;
+ }
+ return (ls->current == s) ? count : (-count) - 1;
+}
+
+
+static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
+ int cont = 0;
+ (void)(cont); /* avoid warnings when `cont' is not used */
+ save_and_next(ls); /* skip 2nd `[' */
+ if (currIsNewline(ls)) /* string starts with a newline? */
+ inclinenumber(ls); /* skip it */
+ for (;;) {
+ switch (ls->current) {
+ case EOZ:
+ luaX_lexerror(ls, (seminfo) ? "unfinished long string" :
+ "unfinished long comment", TK_EOS);
+ break; /* to avoid warnings */
+#if defined(LUA_COMPAT_LSTR)
+ case '[': {
+ if (skip_sep(ls) == sep) {
+ save_and_next(ls); /* skip 2nd `[' */
+ cont++;
+#if LUA_COMPAT_LSTR == 1
+ if (sep == 0)
+ luaX_lexerror(ls, "nesting of [[...]] is deprecated", '[');
+#endif
+ }
+ break;
+ }
+#endif
+ case ']': {
+ if (skip_sep(ls) == sep) {
+ save_and_next(ls); /* skip 2nd `]' */
+#if defined(LUA_COMPAT_LSTR) && LUA_COMPAT_LSTR == 2
+ cont--;
+ if (sep == 0 && cont >= 0) break;
+#endif
+ 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));
+}
+
+
+static void read_string (LexState *ls, int del, SemInfo *seminfo) {
+ save_and_next(ls);
+ while (ls->current != del) {
+ switch (ls->current) {
+ case EOZ:
+ luaX_lexerror(ls, "unfinished string", TK_EOS);
+ continue; /* to avoid warnings */
+ case '\n':
+ case '\r':
+ luaX_lexerror(ls, "unfinished string", TK_STRING);
+ 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;
+ case '\n': /* go through */
+ case '\r': save(ls, '\n'); inclinenumber(ls); continue;
+ case EOZ: continue; /* will raise an error next loop */
+ default: {
+ if (!isdigit(ls->current))
+ save_and_next(ls); /* handles \\, \", \', and \? */
+ else { /* \xxx */
+ int i = 0;
+ c = 0;
+ do {
+ c = 10*c + (ls->current-'0');
+ next(ls);
+ } while (++i<3 && isdigit(ls->current));
+ if (c > UCHAR_MAX)
+ luaX_lexerror(ls, "escape sequence too large", TK_STRING);
+ save(ls, c);
+ }
+ continue;
+ }
+ }
+ save(ls, c);
+ next(ls);
+ continue;
+ }
+ 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);
+}
+
+
+static int llex (LexState *ls, SemInfo *seminfo) {
+ luaZ_resetbuffer(ls->buff);
+ for (;;) {
+ switch (ls->current) {
+ case '\n':
+ case '\r': {
+ inclinenumber(ls);
+ continue;
+ }
+ case '-': {
+ next(ls);
+ if (ls->current != '-') return '-';
+ /* else is a comment */
+ next(ls);
+ if (ls->current == '[') {
+ 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 */
+ luaZ_resetbuffer(ls->buff);
+ continue;
+ }
+ }
+ /* else short comment */
+ while (!currIsNewline(ls) && ls->current != EOZ)
+ next(ls);
+ continue;
+ }
+ case '[': {
+ int sep = skip_sep(ls);
+ if (sep >= 0) {
+ read_long_string(ls, seminfo, sep);
+ return TK_STRING;
+ }
+ else if (sep == -1) return '[';
+ else luaX_lexerror(ls, "invalid long string delimiter", TK_STRING);
+ }
+ case '=': {
+ next(ls);
+ if (ls->current != '=') return '=';
+ else { next(ls); return TK_EQ; }
+ }
+ case '<': {
+ next(ls);
+ if (ls->current != '=') return '<';
+ else { next(ls); return TK_LE; }
+ }
+ case '>': {
+ next(ls);
+ 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 '.': {
+ save_and_next(ls);
+ if (check_next(ls, ".")) {
+ if (check_next(ls, "."))
+ return TK_DOTS; /* ... */
+ else return TK_CONCAT; /* .. */
+ }
+ else if (!isdigit(ls->current)) return '.';
+ else {
+ read_numeral(ls, seminfo);
+ return TK_NUMBER;
+ }
+ }
+ case EOZ: {
+ return TK_EOS;
+ }
+ default: {
+ if (isspace(ls->current)) {
+ lua_assert(!currIsNewline(ls));
+ next(ls);
+ continue;
+ }
+ else if (isdigit(ls->current)) {
+ read_numeral(ls, seminfo);
+ return TK_NUMBER;
+ }
+ else if (isalpha(ls->current) || ls->current == '_') {
+ /* identifier or reserved word */
+ TString *ts;
+ do {
+ save_and_next(ls);
+ } while (isalnum(ls->current) || ls->current == '_');
+ ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
+ luaZ_bufflen(ls->buff));
+ if (ts->tsv.reserved > 0) /* reserved word? */
+ return ts->tsv.reserved - 1 + FIRST_RESERVED;
+ else {
+ seminfo->ts = ts;
+ return TK_NAME;
+ }
+ }
+ else {
+ int c = ls->current;
+ next(ls);
+ return c; /* single-char tokens (+ - / ...) */
+ }
+ }
+ }
+ }
+}
+
+
+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 */
+}
+
+
+void luaX_lookahead (LexState *ls) {
+ lua_assert(ls->lookahead.token == TK_EOS);
+ ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
+}
+