static int read_id_or_reserved(lexer_state *ls, token_info *info)
{
while(lisalnum(ls->current)) save_and_next(ls);
// check for reserved words
for(int i = 0; i < NUM_TOK; ++i) {
if(!strcmp(ls->buf->buf, tokens[i]))
return FIRST_TOK + i;
}
// not a reserved word, must be an id
info->string = strdup(ls->buf->buf);
return TK_ID;
}
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));
}
static size_t readname (LexState *LS, char ch) {
size_t l = 0;
checkbuffer(LS, l);
if (ch != 0)
{
checkbuffer(LS, l);
save(LS, ch, l);
}
do {
checkbuffer(LS, l);
save_and_next(LS, l);
} while (lex_isalnum(LS->current) || LS->current == '_');
save(LS, '\0', l);
return l-1;
}
static void read_long_string (LexState *LS, SemInfo *seminfo) {
lua_State *L = LS->L;
int cont = 0;
size_t l = 0;
checkbuffer(L, 10, l);
save(L, '[', l); /* save first '[' */
save_and_next(L, LS, l); /* pass the second '[' */
for (;;) {
checkbuffer(L, 10, l);
switch (LS->current) {
case EOZ:
save(L, '\0', l);
if (seminfo)
luaX_error(LS, "unfinished long string", TK_STRING);
else
luaX_error(LS, "unfinished comment", TK_EOS);
break; /* to avoid warnings */
case '[':
save_and_next(L, LS, l);
if (LS->current == '[') {
cont++;
save_and_next(L, LS, l);
}
continue;
case ']':
save_and_next(L, LS, l);
if (LS->current == ']') {
if (cont == 0) goto endloop;
cont--;
save_and_next(L, LS, l);
}
continue;
case '\n':
save(L, '\n', l);
inclinenumber(LS);
if (LS->current == '\r') next(LS);
continue;
case '\r':
save(L, '\n', l);
inclinenumber(LS);
if (LS->current == '\n') next(LS);
continue;
default:
if (seminfo) /* no need to save complete comment */
save(L, LS->current, l);
next(LS);
}
} endloop:
save_and_next(L, LS, l); /* skip the second ']' */
save(L, '\0', l);
if (seminfo)
seminfo->ts = luaS_newlstr(L, L->Mbuffer+2, l-5);
}
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);
}
/* Parse a number literal. */
static void lex_number(LexState *ls, TValue *tv)
{
int c;
lua_assert(lj_char_isdigit(ls->current));
do {
c = ls->current;
save_and_next(ls);
} while (lj_char_isident(ls->current) || ls->current == '.' ||
((ls->current == '-' || ls->current == '+') &&
((c & ~0x20) == 'E' || (c & ~0x20) == 'P')));
#if LJ_HASFFI
c &= ~0x20;
if ((c == 'I' || c == 'L' || c == 'U') && !ctype_ctsG(G(ls->L)))
lex_loadffi(ls->L);
if (c == 'I') /* Parse imaginary part of complex number. */
ls->sb.n--;
#endif
save(ls, '\0');
#if LJ_HASFFI
if ((c == 'L' || c == 'U') && lex_number64(ls, tv)) { /* Parse 64 bit int. */
return;
} else
#endif
if (lj_str_numconv(ls->sb.buf, tv)) {
#if LJ_HASFFI
if (c == 'I') { /* Return cdata holding a complex number. */
GCcdata *cd = lj_cdata_new_(ls->L, CTID_COMPLEX_DOUBLE, 2*sizeof(double));
((double *)cdataptr(cd))[0] = 0;
((double *)cdataptr(cd))[1] = numberVnum(tv);
lj_parse_keepcdata(ls, tv, cd);
}
#endif
if (LJ_DUALNUM && tvisnum(tv)) {
int32_t k = lj_num2int(numV(tv));
if ((lua_Number)k == numV(tv)) /* -0 cannot end up here. */
setintV(tv, k);
}
return;
}
lj_lex_error(ls, TK_number, LJ_ERR_XNUMBER);
}
static int read_long_string(LexState *LS, YYSTYPE *l) {
int cont = 0;
while (1) {
switch (LS->current) {
case EOZ:
save(0);
return WRONGTOKEN;
case '[':
save_and_next(LS);
if (LS->current == '[') {
cont++;
save_and_next(LS);
}
continue;
case ']':
save_and_next(LS);
if (LS->current == ']') {
if (cont == 0)
goto endloop;
cont--;
save_and_next(LS);
}
continue;
case '\n':
save('\n');
inclinenumber(LS);
continue;
default:
save_and_next(LS);
}
}
endloop:
save_and_next(LS); // pass the second ']'
Mbuffer[Mbuffnext - 2] = 0; // erases ']]'
l->pTStr = luaS_new(Mbuffbase + 2);
Mbuffer[Mbuffnext - 2] = ']'; // restores ']]'
return STRING;
}
static int gethexa (LexState *ls) {
save_and_next(ls);
esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected");
return luaO_hexavalue(ls->current);
}
static int llex(LexState *ls, TValue *tv)
{
lj_str_resetbuf(&ls->sb);
for (;;) {
if (lj_char_isident(ls->current)) {
GCstr *s;
if (lj_char_isdigit(ls->current)) { /* Numeric literal. */
lex_number(ls, tv);
return TK_number;
}
/* Identifier or reserved word. */
do {
save_and_next(ls);
} while (lj_char_isident(ls->current));
s = lj_parse_keepstr(ls, ls->sb.buf, ls->sb.n);
setstrV(ls->L, tv, s);
if (s->reserved > 0) /* Reserved word? */
return TK_OFS + s->reserved;
return TK_name;
}
switch (ls->current) {
case '\n':
case '\r':
inclinenumber(ls);
continue;
case ' ':
case '\t':
case '\v':
case '\f':
next(ls);
continue;
case '-':
next(ls);
if (ls->current != '-') return '-';
/* else is a comment */
next(ls);
if (ls->current == '[') {
int sep = skip_sep(ls);
lj_str_resetbuf(&ls->sb); /* `skip_sep' may dirty the buffer */
if (sep >= 0) {
read_long_string(ls, NULL, sep); /* long comment */
lj_str_resetbuf(&ls->sb);
continue;
}
}
/* else short comment */
while (!currIsNewline(ls) && ls->current != END_OF_STREAM)
next(ls);
continue;
case '[': {
int sep = skip_sep(ls);
if (sep >= 0) {
read_long_string(ls, tv, sep);
return TK_string;
} else if (sep == -1) {
return '[';
} else {
lj_lex_error(ls, TK_string, LJ_ERR_XLDELIM);
continue;
}
}
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 ':':
next(ls);
if (ls->current != ':') return ':'; else { next(ls); return TK_label; }
case '"':
case '\'':
read_string(ls, ls->current, tv);
return TK_string;
case '.':
save_and_next(ls);
if (ls->current == '.') {
next(ls);
if (ls->current == '.') {
next(ls);
return TK_dots; /* ... */
}
return TK_concat; /* .. */
} else if (!lj_char_isdigit(ls->current)) {
return '.';
} else {
lex_number(ls, tv);
return TK_number;
}
case END_OF_STREAM:
return TK_eof;
default: {
int c = ls->current;
next(ls);
return c; /* Single-char tokens (+ - / ...). */
}
}
}
}
static void read_string(LexState *ls, int delim, TValue *tv)
{
save_and_next(ls);
while (ls->current != delim) {
switch (ls->current) {
case END_OF_STREAM:
lj_lex_error(ls, TK_eof, LJ_ERR_XSTR);
continue;
case '\n':
case '\r':
lj_lex_error(ls, TK_string, LJ_ERR_XSTR);
continue;
case '\\': {
int c = next(ls); /* Skip the '\\'. */
switch (c) {
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 'x': /* Hexadecimal escape '\xXX'. */
c = (next(ls) & 15u) << 4;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 4;
}
c += (next(ls) & 15u);
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9;
}
break;
case 'z': /* Skip whitespace. */
next(ls);
while (lj_char_isspace(ls->current))
if (currIsNewline(ls)) inclinenumber(ls); else next(ls);
continue;
case '\n': case '\r': save(ls, '\n'); inclinenumber(ls); continue;
case '\\': case '\"': case '\'': break;
case END_OF_STREAM: continue;
default:
if (!lj_char_isdigit(c))
goto err_xesc;
c -= '0'; /* Decimal escape '\ddd'. */
if (lj_char_isdigit(next(ls))) {
c = c*10 + (ls->current - '0');
if (lj_char_isdigit(next(ls))) {
c = c*10 + (ls->current - '0');
if (c > 255) {
err_xesc:
lj_lex_error(ls, TK_string, LJ_ERR_XESC);
}
next(ls);
}
}
save(ls, c);
continue;
}
save(ls, c);
next(ls);
continue;
}
default:
save_and_next(ls);
break;
}
}
save_and_next(ls); /* skip delimiter */
setstrV(ls->L, tv, lj_parse_keepstr(ls, ls->sb.buf + 1, ls->sb.n - 2));
}
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 */
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 = 2;
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')));
save(LS, c, l);
}
break;
}
default: {
if (!lex_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 && lex_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);
}
static void read_string(LexState *ls)
{
save_and_next(ls);
while (ls->current != '"') {
switch (ls->current) {
case END_OF_STREAM:
lj_lex_error(ls, TK_eof, LJ_ERR_XSTR);
continue;
case '\\': {
int c = next(ls); /* Skip the '\\'. */
switch (c) {
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 'x': /* Hexadecimal escape '\xXX'. */
c = (next(ls) & 15u) << 4;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 4;
}
c += (next(ls) & 15u);
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9;
}
break;
case 'u': /* Unicode escape '\uXXXX'. */
c = (next(ls) & 15u) << 12;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 12;
}
c += (next(ls) & 15u) << 8;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 8;
}
c += (next(ls) & 15u) << 4;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 4;
}
c += (next(ls) & 15u);
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9;
}
if (c >= 0x0800) {
save(ls, 0xE0 | (c >> 12));
save(ls, 0x80 | ((c >> 6) & 0x3f));
c = 0x80 | (c & 0x3f);
}
else if (c >= 0x0080) {
save(ls, 0xC0 | (c >> 6));
c = 0x80 | (c & 0x3f);
}
break;
case 'U': /* Unicode escape '\UXXXXXXXX'. */
c = (next(ls) & 15u) << 28;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 28;
}
c += (next(ls) & 15u) << 24;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 24;
}
c += (next(ls) & 15u) << 20;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 20;
}
c += (next(ls) & 15u) << 16;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 16;
}
c += (next(ls) & 15u) << 12;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 12;
}
c += (next(ls) & 15u) << 8;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 8;
}
c += (next(ls) & 15u) << 4;
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9 << 4;
}
c += (next(ls) & 15u);
if (!lj_char_isdigit(ls->current)) {
if (!lj_char_isxdigit(ls->current)) goto err_xesc;
c += 9;
}
if (c >= 0x4000000) {
save(ls, 0xFC | (c >> 30));
save(ls, 0x80 | ((c >> 24) & 0x3f));
save(ls, 0x80 | ((c >> 18) & 0x3f));
save(ls, 0x80 | ((c >> 12) & 0x3f));
save(ls, 0x80 | ((c >> 6) & 0x3f));
c = 0x80 | (c & 0x3f);
}
else if (c >= 0x200000) {
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);
unsigned char b_current = (unsigned char)LS->current;
if (b_current & 0x80)
{
save_and_next(LS, l);
save_and_next(LS, l);
}
else
{
switch (b_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);
}
int luaX_lex (LexState *LS) {
luaL_resetbuffer();
for (;;) {
switch (LS->current) {
case ' ': case '\t': case '\r': /* CR: to avoid problems with DOS */
next(LS);
continue;
case '\n':
inclinenumber(LS);
continue;
case '-':
save_and_next(LS);
if (LS->current != '-') return '-';
do { next(LS); } while (LS->current != '\n' && LS->current != EOZ);
luaL_resetbuffer();
continue;
case '[':
save_and_next(LS);
if (LS->current != '[') return '[';
else {
save_and_next(LS); /* pass the second '[' */
return read_long_string(LS);
}
case '=':
save_and_next(LS);
if (LS->current != '=') return '=';
else { save_and_next(LS); return EQ; }
case '<':
save_and_next(LS);
if (LS->current != '=') return '<';
else { save_and_next(LS); return LE; }
case '>':
save_and_next(LS);
if (LS->current != '=') return '>';
else { save_and_next(LS); return GE; }
case '~':
save_and_next(LS);
if (LS->current != '=') return '~';
else { save_and_next(LS); return NE; }
case '"':
case '\'': {
int del = LS->current;
save_and_next(LS);
while (LS->current != del) {
switch (LS->current) {
case EOZ:
case '\n':
luaX_error(LS, "unfinished string");
return EOS; /* to avoid warnings */
case '\\':
next(LS); /* do not save the '\' */
switch (LS->current) {
case 'a': save('\a'); next(LS); break;
case 'b': save('\b'); next(LS); break;
case 'f': save('\f'); next(LS); break;
case 'n': save('\n'); next(LS); break;
case 'r': save('\r'); next(LS); break;
case 't': save('\t'); next(LS); break;
case 'v': save('\v'); next(LS); break;
case '\n': save('\n'); inclinenumber(LS); break;
default : {
if (isdigit(LS->current)) {
int c = 0;
int i = 0;
do {
c = 10*c + (LS->current-'0');
next(LS);
} while (++i<3 && isdigit(LS->current));
if (c != (unsigned char)c)
luaX_error(LS, "escape sequence too large");
save(c);
}
else { /* handles \, ", ', and ? */
save(LS->current);
next(LS);
}
break;
}
}
break;
default:
save_and_next(LS);
}
}
save_and_next(LS); /* skip delimiter */
LS->seminfo.ts = luaS_newlstr(L->Mbuffer+(L->Mbuffbase+1),
L->Mbuffnext-L->Mbuffbase-2);
return STRING;
}
case '.':
save_and_next(LS);
if (LS->current == '.')
{
save_and_next(LS);
if (LS->current == '.')
{
save_and_next(LS);
return DOTS; /* ... */
}
else return CONC; /* .. */
}
else if (!isdigit(LS->current)) return '.';
goto fraction; /* LS->current is a digit: goes through to number */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
do {
save_and_next(LS);
} while (isdigit(LS->current));
if (LS->current == '.') {
save_and_next(LS);
if (LS->current == '.') {
save('.');
luaX_error(LS,
"ambiguous syntax (decimal point x string concatenation)");
}
}
fraction:
while (isdigit(LS->current))
save_and_next(LS);
if (toupper(LS->current) == 'E') {
save_and_next(LS); /* read 'E' */
save_and_next(LS); /* read '+', '-' or first digit */
while (isdigit(LS->current))
save_and_next(LS);
}
save('\0');
LS->seminfo.r = luaO_str2d(L->Mbuffer+L->Mbuffbase);
if (LS->seminfo.r < 0)
luaX_error(LS, "invalid numeric format");
return NUMBER;
case EOZ:
if (LS->iflevel > 0)
luaX_error(LS, "input ends inside a $if");
return EOS;
default:
if (LS->current != '_' && !isalpha(LS->current)) {
int c = LS->current;
if (iscntrl(c))
luaX_invalidchar(LS, c);
save_and_next(LS);
return c;
}
else { /* identifier or reserved word */
TaggedString *ts;
do {
save_and_next(LS);
} while (isalnum(LS->current) || LS->current == '_');
save('\0');
ts = luaS_new(L->Mbuffer+L->Mbuffbase);
if (ts->head.marked >= FIRST_RESERVED)
return ts->head.marked; /* reserved word */
LS->seminfo.ts = ts;
return NAME;
}
}
}
}
int32 luaY_lex(YYSTYPE *l) {
LexState *LS = lua_state->lexstate;
double a;
luaL_resetbuffer();
if (lua_debug)
luaY_codedebugline(LS->linelasttoken);
LS->linelasttoken = LS->linenumber;
while (1) {
switch (LS->current) {
case ' ':
case '\t':
case '\r': // CR: to avoid problems with DOS
next(LS);
continue;
case '\n':
inclinenumber(LS);
LS->linelasttoken = LS->linenumber;
continue;
case '-':
save_and_next(LS);
if (LS->current != '-')
return '-';
do {
next(LS);
} while (LS->current != '\n' && LS->current != EOZ);
luaL_resetbuffer();
continue;
case '[':
save_and_next(LS);
if (LS->current != '[')
return '[';
else {
save_and_next(LS); // pass the second '['
return read_long_string(LS, l);
}
case '=':
save_and_next(LS);
if (LS->current != '=')
return '=';
else {
save_and_next(LS);
return EQ;
}
case '<':
save_and_next(LS);
if (LS->current != '=')
return '<';
else {
save_and_next(LS);
return LE;
}
case '>':
save_and_next(LS);
if (LS->current != '=')
return '>';
else {
save_and_next(LS);
return GE;
}
case '~':
save_and_next(LS);
if (LS->current != '=')
return '~';
else {
save_and_next(LS);
return NE;
}
case '"':
case '\'':
{
int32 del = LS->current;
save_and_next(LS);
while (LS->current != del) {
switch (LS->current) {
case EOZ:
case '\n':
save(0);
return WRONGTOKEN;
case '\\':
next(LS); // do not save the '\'
switch (LS->current) {
case 'n':
save('\n');
next(LS);
break;
case 't':
save('\t');
next(LS);
break;
case 'r':
save('\r');
next(LS);
break;
case '\n':
save('\n');
inclinenumber(LS);
break;
default :
save_and_next(LS); break;
}
break;
default:
save_and_next(LS);
}
}
next(LS); // skip delimiter
save(0);
l->pTStr = luaS_new(Mbuffbase + 1);
Mbuffer[Mbuffnext - 1] = del; // restore delimiter
return STRING;
}
case '.':
save_and_next(LS);
if (LS->current == '.') {
save_and_next(LS);
if (LS->current == '.') {
save_and_next(LS);
return DOTS; // ...
} else
return CONC; // ..
} else if (!Common::isDigit(LS->current))
return '.';
// LS->current is a digit: goes through to number/
a = 0.0;
goto fraction;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
a = 0.0;
do {
a = 10.0 * a + (LS->current - '0');
save_and_next(LS);
} while (Common::isDigit(LS->current));
if (LS->current == '.') {
save_and_next(LS);
if (LS->current == '.') {
save(0);
luaY_error("ambiguous syntax (decimal point x string concatenation)");
}
}
fraction:
{
double da = 0.1;
while (Common::isDigit(LS->current)) {
a += (LS->current - '0') * da;
da /= 10.0;
save_and_next(LS);
}
if (toupper(LS->current) == 'E') {
int32 e = 0;
int32 neg;
double ea;
save_and_next(LS);
neg = (LS->current == '-');
if (LS->current == '+' || LS->current == '-')
save_and_next(LS);
if (!Common::isDigit(LS->current)) {
save(0);
return WRONGTOKEN;
}
do {
e = 10 * e + (LS->current - '0');
save_and_next(LS);
} while (Common::isDigit(LS->current));
for (ea = neg ? 0.1 : 10.0; e > 0; e >>= 1) {
if (e & 1)
a *= ea;
ea *= ea;
}
}
l->vReal = a;
return NUMBER;
}
case EOZ:
save(0);
if (LS->iflevel > 0)
luaY_syntaxerror("input ends inside a $if", "");
return 0;
default:
if (LS->current != '_' && !Common::isAlpha(LS->current)) {
int32 c = LS->current;
save_and_next(LS);
return c;
} else { // identifier or reserved word
TaggedString *ts;
do {
save_and_next(LS);
} while (Common::isAlnum(LS->current) || LS->current == '_');
save(0);
ts = luaS_new(Mbuffbase);
if (ts->head.marked >= 255)
return ts->head.marked; // reserved word
l->pTStr = ts;
return NAME;
}
}
}
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);
}
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;
}
}
}
}
}
/* 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;
}
}
