mirror of https://github.com/lua/lua
new escape sequence '\*' + several comments + moving options from
switch default into cases (as now locale is fixed)
This commit is contained in:
Roberto Ierusalimschy
parent
cf22133b69
commit
d8d81ba891
104
llex.c
104
llex.c
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@ -1,5 +1,5 @@
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/*
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** $Id: llex.c,v 2.35 2010/02/27 21:16:24 roberto Exp roberto $
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** $Id: llex.c,v 2.36 2010/04/05 16:35:37 roberto Exp roberto $
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** Lexical Analyzer
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** See Copyright Notice in lua.h
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*/
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@ -117,21 +117,30 @@ void luaX_syntaxerror (LexState *ls, const char *msg) {
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}
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/*
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** creates a new string and anchors it in function's table so that
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** it will not be collected until the end of the function's compilation
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** (by that time it should be anchored in function's prototype)
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*/
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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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TValue *o; /* entry for `str' */
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TString *ts = luaS_newlstr(L, str, l);
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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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TString *ts = luaS_newlstr(L, str, l); /* create new string */
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setsvalue2s(L, L->top++, ts); /* temporarily anchor it in stack */
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o = luaH_setstr(L, ls->fs->h, ts);
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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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setbvalue(o, 1); /* t[string] = true */
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luaC_checkGC(L);
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}
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L->top--;
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L->top--; /* remove string from stack */
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return ts;
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}
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/*
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** increment line number and skips newline sequence (any of
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** \n, \r, \n\r, or \r\n)
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*/
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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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@ -152,7 +161,7 @@ void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
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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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ls->envn = luaS_new(L, "_ENV");
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ls->envn = luaS_new(L, "_ENV"); /* create env name */
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luaS_fix(ls->envn); /* never collect this name */
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luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
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next(ls); /* read first char */
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@ -176,6 +185,9 @@ static int check_next (LexState *ls, const char *set) {
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}
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/*
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** change all characters 'from' in buffer to 'to'
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*/
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static void buffreplace (LexState *ls, char from, char to) {
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size_t n = luaZ_bufflen(ls->buff);
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char *p = luaZ_buffer(ls->buff);
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@ -188,11 +200,14 @@ static void buffreplace (LexState *ls, char from, char to) {
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#define getlocaledecpoint() (localeconv()->decimal_point[0])
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#endif
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/*
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** in case of format error, try to change decimal point separator to
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** the one defined in the current locale and check again
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*/
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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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ls->decpoint = getlocaledecpoint();
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buffreplace(ls, old, ls->decpoint); /* try updated decimal separator */
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buffreplace(ls, old, ls->decpoint); /* try new 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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@ -218,6 +233,10 @@ static void read_numeral (LexState *ls, SemInfo *seminfo) {
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}
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/*
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** skip a sequence '[=*=[' or ']=*]' and return its number of '='s or
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** -1 if sequence is malformed
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*/
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static int skip_sep (LexState *ls) {
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int count = 0;
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int s = ls->current;
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@ -248,8 +267,7 @@ static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
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}
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break;
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}
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case '\n':
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case '\r': {
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case '\n': case '\r': {
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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 */
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@ -310,7 +328,7 @@ static int readdecesc (LexState *ls) {
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static void read_string (LexState *ls, int del, SemInfo *seminfo) {
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save_and_next(ls);
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save_and_next(ls); /* keep delimiter (for error messages) */
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while (ls->current != del) {
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switch (ls->current) {
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case EOZ:
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@ -335,6 +353,14 @@ static void read_string (LexState *ls, int del, SemInfo *seminfo) {
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case '\n':
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case '\r': save(ls, '\n'); inclinenumber(ls); continue;
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case EOZ: continue; /* will raise an error next loop */
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case '*': { /* skip following span of spaces */
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next(ls); /* skip the '*' */
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while (lisspace(ls->current)) {
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if (currIsNewline(ls)) inclinenumber(ls);
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else next(ls);
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}
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continue; /* do not save 'c' */
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}
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default: {
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if (!lisdigit(ls->current))
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c = ls->current; /* handles \\, \", \', and \? */
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@ -361,31 +387,34 @@ static int llex (LexState *ls, SemInfo *seminfo) {
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luaZ_resetbuffer(ls->buff);
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for (;;) {
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switch (ls->current) {
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case '\n':
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case '\r': {
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case '\n': case '\r': { /* line breaks */
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inclinenumber(ls);
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break;
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}
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case '-': {
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case ' ': case '\f': case '\t': case '\v': { /* spaces */
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next(ls);
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break;
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}
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case '-': { /* '-' or '--' (comment) */
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next(ls);
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if (ls->current != '-') return '-';
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/* else is a comment */
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next(ls);
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if (ls->current == '[') {
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if (ls->current == '[') { /* long comment? */
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int sep = skip_sep(ls);
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luaZ_resetbuffer(ls->buff); /* `skip_sep' may dirty the buffer */
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if (sep >= 0) {
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read_long_string(ls, NULL, sep); /* long comment */
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luaZ_resetbuffer(ls->buff);
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read_long_string(ls, NULL, sep); /* skip long comment */
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luaZ_resetbuffer(ls->buff); /* previous call may dirty the buff. */
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break;
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}
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}
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/* else short comment */
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while (!currIsNewline(ls) && ls->current != EOZ)
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next(ls);
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next(ls); /* skip until end of line (or end of file) */
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break;
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}
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case '[': {
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case '[': { /* long string or simply '[' */
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int sep = skip_sep(ls);
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if (sep >= 0) {
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read_long_string(ls, seminfo, sep);
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@ -414,39 +443,30 @@ static int llex (LexState *ls, SemInfo *seminfo) {
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if (ls->current != '=') return '~';
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else { next(ls); return TK_NE; }
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}
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case '"':
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case '\'': {
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case '"': case '\'': { /* short literal strings */
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read_string(ls, ls->current, seminfo);
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return TK_STRING;
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}
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case '.': {
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case '.': { /* '.', '..', '...', or number */
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save_and_next(ls);
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if (check_next(ls, ".")) {
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if (check_next(ls, "."))
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return TK_DOTS; /* ... */
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else return TK_CONCAT; /* .. */
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return TK_DOTS; /* '...' */
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else return TK_CONCAT; /* '..' */
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}
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else if (!lisdigit(ls->current)) return '.';
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else {
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read_numeral(ls, seminfo);
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return TK_NUMBER;
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}
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/* else go through */
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}
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9': {
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read_numeral(ls, seminfo);
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return TK_NUMBER;
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}
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case EOZ: {
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return TK_EOS;
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}
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default: {
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if (lisspace(ls->current)) {
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lua_assert(!currIsNewline(ls));
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next(ls);
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break;
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}
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else if (lisdigit(ls->current)) {
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read_numeral(ls, seminfo);
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return TK_NUMBER;
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}
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else if (lislalpha(ls->current)) {
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/* identifier or reserved word */
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if (lislalpha(ls->current)) { /* identifier or reserved word? */
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TString *ts;
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do {
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save_and_next(ls);
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@ -460,10 +480,10 @@ static int llex (LexState *ls, SemInfo *seminfo) {
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return TK_NAME;
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}
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}
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else {
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else { /* single-char tokens (+ - / ...) */
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int c = ls->current;
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next(ls);
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return c; /* single-char tokens (+ - / ...) */
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return c;
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}
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}
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}
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