Sweden-Number/dlls/jscript/lex.c

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/*
* Copyright 2008 Jacek Caban for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <math.h>
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#include <limits.h>
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#include "jscript.h"
#include "activscp.h"
#include "objsafe.h"
#include "engine.h"
#include "parser.tab.h"
#include "wine/debug.h"
#include "wine/unicode.h"
WINE_DEFAULT_DEBUG_CHANNEL(jscript);
#define LONGLONG_MAX (((LONGLONG)0x7fffffff<<32)|0xffffffff)
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static const WCHAR breakW[] = {'b','r','e','a','k',0};
static const WCHAR caseW[] = {'c','a','s','e',0};
static const WCHAR catchW[] = {'c','a','t','c','h',0};
static const WCHAR continueW[] = {'c','o','n','t','i','n','u','e',0};
static const WCHAR defaultW[] = {'d','e','f','a','u','l','t',0};
static const WCHAR deleteW[] = {'d','e','l','e','t','e',0};
static const WCHAR doW[] = {'d','o',0};
static const WCHAR elseW[] = {'e','l','s','e',0};
static const WCHAR falseW[] = {'f','a','l','s','e',0};
static const WCHAR finallyW[] = {'f','i','n','a','l','l','y',0};
static const WCHAR forW[] = {'f','o','r',0};
static const WCHAR functionW[] = {'f','u','n','c','t','i','o','n',0};
static const WCHAR ifW[] = {'i','f',0};
static const WCHAR inW[] = {'i','n',0};
static const WCHAR instanceofW[] = {'i','n','s','t','a','n','c','e','o','f',0};
static const WCHAR newW[] = {'n','e','w',0};
static const WCHAR nullW[] = {'n','u','l','l',0};
static const WCHAR returnW[] = {'r','e','t','u','r','n',0};
static const WCHAR switchW[] = {'s','w','i','t','c','h',0};
static const WCHAR thisW[] = {'t','h','i','s',0};
static const WCHAR throwW[] = {'t','h','r','o','w',0};
static const WCHAR trueW[] = {'t','r','u','e',0};
static const WCHAR tryW[] = {'t','r','y',0};
static const WCHAR typeofW[] = {'t','y','p','e','o','f',0};
static const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
static const WCHAR varW[] = {'v','a','r',0};
static const WCHAR voidW[] = {'v','o','i','d',0};
static const WCHAR whileW[] = {'w','h','i','l','e',0};
static const WCHAR withW[] = {'w','i','t','h',0};
static const struct {
const WCHAR *word;
int token;
} keywords[] = {
{breakW, kBREAK},
{caseW, kCASE},
{catchW, kCATCH},
{continueW, kCONTINUE},
{defaultW, kDEFAULT},
{deleteW, kDELETE},
{doW, kDO},
{elseW, kELSE},
{falseW, kFALSE},
{finallyW, kFINALLY},
{forW, kFOR},
{functionW, kFUNCTION},
{ifW, kIF},
{inW, kIN},
{instanceofW, kINSTANCEOF},
{newW, kNEW},
{nullW, kNULL},
{returnW, kRETURN},
{switchW, kSWITCH},
{thisW, kTHIS},
{throwW, kTHROW},
{trueW, kTRUE},
{tryW, kTRY},
{typeofW, kTYPEOF},
{undefinedW, kUNDEFINED},
{varW, kVAR},
{voidW, kVOID},
{whileW, kWHILE},
{withW, kWITH}
};
static int lex_error(parser_ctx_t *ctx, HRESULT hres)
{
ctx->hres = hres;
return -1;
}
static int check_keyword(parser_ctx_t *ctx, const WCHAR *word, const WCHAR **lval)
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{
const WCHAR *p1 = ctx->ptr;
const WCHAR *p2 = word;
while(p1 < ctx->end && *p2) {
if(*p1 != *p2)
return *p1 - *p2;
p1++;
p2++;
}
if(*p2 || (p1 < ctx->end && isalnumW(*p1)))
return 1;
*lval = ctx->ptr;
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ctx->ptr = p1;
return 0;
}
/* ECMA-262 3rd Edition 7.3 */
static BOOL is_endline(WCHAR c)
{
return c == '\n' || c == '\r' || c == 0x2028 || c == 0x2029;
}
static BOOL is_identifier_char(WCHAR c)
{
return isalnumW(c) || c == '$' || c == '_' || c == '\\';
}
static int hex_to_int(WCHAR c)
{
if('0' <= c && c <= '9')
return c-'0';
if('a' <= c && c <= 'f')
return c-'a'+10;
if('A' <= c && c <= 'F')
return c-'A'+10;
return -1;
}
static int check_keywords(parser_ctx_t *ctx, const WCHAR **lval)
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{
int min = 0, max = sizeof(keywords)/sizeof(keywords[0])-1, r, i;
while(min <= max) {
i = (min+max)/2;
r = check_keyword(ctx, keywords[i].word, lval);
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if(!r)
return keywords[i].token;
if(r > 0)
min = i+1;
else
max = i-1;
}
return 0;
}
static void skip_spaces(parser_ctx_t *ctx)
{
while(ctx->ptr < ctx->end && isspaceW(*ctx->ptr)) {
if(is_endline(*ctx->ptr++))
ctx->nl = TRUE;
}
}
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static BOOL skip_html_comment(parser_ctx_t *ctx)
{
const WCHAR html_commentW[] = {'<','!','-','-',0};
if(!ctx->is_html || ctx->ptr+3 >= ctx->end ||
memcmp(ctx->ptr, html_commentW, sizeof(WCHAR)*4))
return FALSE;
ctx->nl = TRUE;
while(ctx->ptr < ctx->end && !is_endline(*ctx->ptr++));
return TRUE;
}
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static BOOL skip_comment(parser_ctx_t *ctx)
{
if(ctx->ptr+1 >= ctx->end || *ctx->ptr != '/')
return FALSE;
switch(ctx->ptr[1]) {
case '*':
ctx->ptr += 2;
while(ctx->ptr+1 < ctx->end && (ctx->ptr[0] != '*' || ctx->ptr[1] != '/'))
ctx->ptr++;
if(ctx->ptr[0] == '*' && ctx->ptr[1] == '/') {
ctx->ptr += 2;
}else {
WARN("unexpected end of file (missing end of comment)\n");
ctx->ptr = ctx->end;
}
break;
case '/':
ctx->ptr += 2;
while(ctx->ptr < ctx->end && !is_endline(*ctx->ptr))
ctx->ptr++;
break;
default:
return FALSE;
}
return TRUE;
}
static BOOL unescape(WCHAR *str)
{
WCHAR *pd, *p, c;
int i;
pd = p = str;
while(*p) {
if(*p != '\\') {
*pd++ = *p++;
continue;
}
p++;
c = 0;
switch(*p) {
case '\'':
case '\"':
case '\\':
c = *p;
break;
case 'b':
c = '\b';
break;
case 't':
c = '\t';
break;
case 'n':
c = '\n';
break;
case 'v':
c = '\v';
break;
case 'f':
c = '\f';
break;
case 'r':
c = '\r';
break;
case 'x':
i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c = i << 4;
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i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c += i;
break;
case 'u':
i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c = i << 12;
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i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c += i << 8;
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i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c += 1 << 4;
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i = hex_to_int(*++p);
if(i == -1)
return FALSE;
c += i;
break;
default:
if(isdigitW(*p)) {
c = *p++ - '0';
while(isdigitW(*p))
c = c*10 + (*p++ - '0');
*pd++ = c;
continue;
}
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c = *p;
}
*pd++ = c;
p++;
}
*pd = 0;
return TRUE;
}
static int parse_identifier(parser_ctx_t *ctx, const WCHAR **ret)
{
const WCHAR *ptr = ctx->ptr++;
WCHAR *wstr;
int len;
while(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr))
ctx->ptr++;
len = ctx->ptr-ptr;
*ret = wstr = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
memcpy(wstr, ptr, (len+1)*sizeof(WCHAR));
wstr[len] = 0;
/* FIXME: unescape */
return tIdentifier;
}
static int parse_string_literal(parser_ctx_t *ctx, const WCHAR **ret, WCHAR endch)
{
const WCHAR *ptr = ++ctx->ptr;
WCHAR *wstr;
int len;
while(ctx->ptr < ctx->end && *ctx->ptr != endch) {
if(*ctx->ptr++ == '\\')
ctx->ptr++;
}
if(ctx->ptr == ctx->end) {
WARN("unexpected end of file\n");
return lex_error(ctx, E_FAIL);
}
len = ctx->ptr-ptr;
*ret = wstr = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
memcpy(wstr, ptr, (len+1)*sizeof(WCHAR));
wstr[len] = 0;
ctx->ptr++;
if(!unescape(wstr)) {
WARN("unescape failed\n");
return lex_error(ctx, E_FAIL);
}
return tStringLiteral;
}
static literal_t *alloc_int_literal(parser_ctx_t *ctx, LONG l)
{
literal_t *ret = parser_alloc(ctx, sizeof(literal_t));
ret->vt = VT_I4;
ret->u.lval = l;
return ret;
}
static int parse_double_literal(parser_ctx_t *ctx, LONG int_part, literal_t **literal)
{
LONGLONG d, hlp;
int exp = 0;
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if(ctx->ptr == ctx->end || (!isdigitW(*ctx->ptr) &&
*ctx->ptr!='.' && *ctx->ptr!='e' && *ctx->ptr!='E')) {
ERR("Illegal character\n");
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return 0;
}
d = int_part;
while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
hlp = d*10 + *(ctx->ptr++) - '0';
if(d>LONGLONG_MAX/10 || hlp<0) {
exp++;
break;
}
else
d = hlp;
}
while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
exp++;
ctx->ptr++;
}
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if(*ctx->ptr == '.') ctx->ptr++;
while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
hlp = d*10 + *(ctx->ptr++) - '0';
if(d>LONGLONG_MAX/10 || hlp<0)
break;
d = hlp;
exp--;
}
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while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
ctx->ptr++;
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if(ctx->ptr < ctx->end && (*ctx->ptr == 'e' || *ctx->ptr == 'E')) {
int sign = 1, e = 0;
ctx->ptr++;
if(ctx->ptr < ctx->end) {
if(*ctx->ptr == '+') {
ctx->ptr++;
}else if(*ctx->ptr == '-') {
sign = -1;
ctx->ptr++;
}else if(!isdigitW(*ctx->ptr)) {
WARN("Expected exponent part\n");
return lex_error(ctx, E_FAIL);
}
}
if(ctx->ptr == ctx->end) {
WARN("unexpected end of file\n");
return lex_error(ctx, E_FAIL);
}
while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
if(e > INT_MAX/10 || (e = e*10 + *ctx->ptr++ - '0')<0)
e = INT_MAX;
}
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e *= sign;
if(exp<0 && e<0 && e+exp>0) exp = INT_MIN;
else if(exp>0 && e>0 && e+exp<0) exp = INT_MAX;
else exp += e;
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}
*literal = parser_alloc(ctx, sizeof(literal_t));
(*literal)->vt = VT_R8;
(*literal)->u.dval = (double)d*pow(10, exp);
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return tNumericLiteral;
}
static int parse_numeric_literal(parser_ctx_t *ctx, literal_t **literal)
{
LONG l, d;
l = *ctx->ptr++ - '0';
if(ctx->ptr == ctx->end) {
*literal = alloc_int_literal(ctx, l);
return tNumericLiteral;
}
if(!l) {
if(*ctx->ptr == 'x' || *ctx->ptr == 'X') {
if(++ctx->ptr == ctx->end) {
ERR("unexpexted end of file\n");
return 0;
}
while(ctx->ptr < ctx->end && (d = hex_to_int(*ctx->ptr)) != -1) {
l = l*16 + d;
ctx->ptr++;
}
if(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr)) {
WARN("unexpected identifier char\n");
return lex_error(ctx, E_FAIL);
}
*literal = alloc_int_literal(ctx, l);
return tNumericLiteral;
}
if(isdigitW(*ctx->ptr) || is_identifier_char(*ctx->ptr)) {
WARN("wrong char after zero\n");
return lex_error(ctx, E_FAIL);
}
*literal = alloc_int_literal(ctx, 0);
}
while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
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{
d = l*10 + *(ctx->ptr)-'0';
/* Check for integer overflow */
if (l > INT_MAX/10 || d < 0)
return parse_double_literal(ctx, l, literal);
l = d;
ctx->ptr++;
}
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if(ctx->ptr < ctx->end) {
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if(*ctx->ptr == '.' || *ctx->ptr == 'e' || *ctx->ptr == 'E')
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return parse_double_literal(ctx, l, literal);
if(is_identifier_char(*ctx->ptr)) {
WARN("unexpected identifier char\n");
return lex_error(ctx, E_FAIL);
}
}
*literal = alloc_int_literal(ctx, l);
return tNumericLiteral;
}
int parser_lex(void *lval, parser_ctx_t *ctx)
{
int ret;
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ctx->nl = ctx->ptr == ctx->begin;
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do {
skip_spaces(ctx);
if(ctx->ptr == ctx->end)
return 0;
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}while(skip_comment(ctx) || skip_html_comment(ctx));
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if(isalphaW(*ctx->ptr)) {
ret = check_keywords(ctx, lval);
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if(ret)
return ret;
return parse_identifier(ctx, lval);
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}
if(isdigitW(*ctx->ptr))
return parse_numeric_literal(ctx, lval);
switch(*ctx->ptr) {
case '{':
case '(':
case ')':
case '[':
case ']':
case ';':
case ',':
case '~':
case '?':
case ':':
return *ctx->ptr++;
case '}':
*(const WCHAR**)lval = ctx->ptr++;
return '}';
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case '.':
if(++ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
return parse_double_literal(ctx, 0, lval);
return '.';
case '<':
if(++ctx->ptr == ctx->end) {
*(int*)lval = EXPR_LESS;
return tRelOper;
}
switch(*ctx->ptr) {
case '=': /* <= */
ctx->ptr++;
*(int*)lval = EXPR_LESSEQ;
return tRelOper;
case '<': /* << */
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* <<= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNLSHIFT;
return tAssignOper;
}
*(int*)lval = EXPR_LSHIFT;
return tShiftOper;
default: /* < */
*(int*)lval = EXPR_LESS;
return tRelOper;
}
case '>':
if(++ctx->ptr == ctx->end) { /* > */
*(int*)lval = EXPR_GREATER;
return tRelOper;
}
switch(*ctx->ptr) {
case '=': /* >= */
ctx->ptr++;
*(int*)lval = EXPR_GREATEREQ;
return tRelOper;
case '>': /* >> */
if(++ctx->ptr < ctx->end) {
if(*ctx->ptr == '=') { /* >>= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNRSHIFT;
return tAssignOper;
}
if(*ctx->ptr == '>') { /* >>> */
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* >>>= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNRRSHIFT;
return tAssignOper;
}
*(int*)lval = EXPR_RRSHIFT;
return tRelOper;
}
}
*(int*)lval = EXPR_RSHIFT;
return tShiftOper;
default:
*(int*)lval = EXPR_GREATER;
return tRelOper;
}
case '+':
ctx->ptr++;
if(ctx->ptr < ctx->end) {
switch(*ctx->ptr) {
case '+': /* ++ */
ctx->ptr++;
return tINC;
case '=': /* += */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNADD;
return tAssignOper;
}
}
return '+';
case '-':
ctx->ptr++;
if(ctx->ptr < ctx->end) {
switch(*ctx->ptr) {
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case '-': /* -- or --> */
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ctx->ptr++;
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if(ctx->is_html && ctx->nl && ctx->ptr < ctx->end && *ctx->ptr == '>') {
ctx->ptr++;
return tHTMLCOMMENT;
}
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return tDEC;
case '=': /* -= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNSUB;
return tAssignOper;
}
}
return '-';
case '*':
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* *= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNMUL;
return tAssignOper;
}
return '*';
case '%':
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* %= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNMOD;
return tAssignOper;
}
return '%';
case '&':
if(++ctx->ptr < ctx->end) {
switch(*ctx->ptr) {
case '=': /* &= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNAND;
return tAssignOper;
case '&': /* && */
ctx->ptr++;
return tANDAND;
}
}
return '&';
case '|':
if(++ctx->ptr < ctx->end) {
switch(*ctx->ptr) {
case '=': /* |= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNOR;
return tAssignOper;
case '|': /* || */
ctx->ptr++;
return tOROR;
}
}
return '|';
case '^':
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* ^= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNXOR;
return tAssignOper;
}
return '^';
case '!':
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* != */
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* !== */
ctx->ptr++;
*(int*)lval = EXPR_NOTEQEQ;
return tEqOper;
}
*(int*)lval = EXPR_NOTEQ;
return tEqOper;
}
return '!';
case '=':
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* == */
if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* === */
ctx->ptr++;
*(int*)lval = EXPR_EQEQ;
return tEqOper;
}
*(int*)lval = EXPR_EQ;
return tEqOper;
}
return '=';
case '/':
if(++ctx->ptr < ctx->end) {
if(*ctx->ptr == '=') { /* /= */
ctx->ptr++;
*(int*)lval = EXPR_ASSIGNDIV;
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return tAssignOper;
}
}
return '/';
case '\"':
case '\'':
return parse_string_literal(ctx, lval, *ctx->ptr);
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case '_':
case '$':
return parse_identifier(ctx, lval);
}
WARN("unexpected char '%c' %d\n", *ctx->ptr, *ctx->ptr);
return 0;
}
static void add_object_literal(parser_ctx_t *ctx, DispatchEx *obj)
{
obj_literal_t *literal = parser_alloc(ctx, sizeof(obj_literal_t));
literal->obj = obj;
literal->next = ctx->obj_literals;
ctx->obj_literals = literal;
}
literal_t *parse_regexp(parser_ctx_t *ctx)
{
const WCHAR *re, *flags;
DispatchEx *regexp;
literal_t *ret;
DWORD re_len;
HRESULT hres;
TRACE("\n");
re = ctx->ptr;
while(ctx->ptr < ctx->end && *ctx->ptr != '/') {
if(*ctx->ptr++ == '\\' && ctx->ptr < ctx->end)
ctx->ptr++;
}
if(ctx->ptr == ctx->end) {
WARN("unexpected end of file\n");
return NULL;
}
re_len = ctx->ptr-re;
flags = ++ctx->ptr;
while(ctx->ptr < ctx->end && isalnumW(*ctx->ptr))
ctx->ptr++;
hres = create_regexp_str(ctx->script, re, re_len, flags, ctx->ptr-flags, &regexp);
if(FAILED(hres))
return NULL;
add_object_literal(ctx, regexp);
ret = parser_alloc(ctx, sizeof(literal_t));
ret->vt = VT_DISPATCH;
ret->u.disp = (IDispatch*)_IDispatchEx_(regexp);
return ret;
}