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reactos/dll/win32/vbscript/lex.c

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/*
* Copyright 2011 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
*/
#ifdef __REACTOS__
#include <wine/config.h>
#include <wine/port.h>
#endif
#include <assert.h>
#include <limits.h>
#include <math.h>
#include "vbscript.h"
#include "parse.h"
#include "parser.tab.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
static const WCHAR andW[] = {'a','n','d',0};
static const WCHAR byrefW[] = {'b','y','r','e','f',0};
static const WCHAR byvalW[] = {'b','y','v','a','l',0};
static const WCHAR callW[] = {'c','a','l','l',0};
static const WCHAR caseW[] = {'c','a','s','e',0};
static const WCHAR classW[] = {'c','l','a','s','s',0};
static const WCHAR constW[] = {'c','o','n','s','t',0};
static const WCHAR defaultW[] = {'d','e','f','a','u','l','t',0};
static const WCHAR dimW[] = {'d','i','m',0};
static const WCHAR doW[] = {'d','o',0};
static const WCHAR eachW[] = {'e','a','c','h',0};
static const WCHAR elseW[] = {'e','l','s','e',0};
static const WCHAR elseifW[] = {'e','l','s','e','i','f',0};
static const WCHAR emptyW[] = {'e','m','p','t','y',0};
static const WCHAR endW[] = {'e','n','d',0};
static const WCHAR eqvW[] = {'e','q','v',0};
static const WCHAR errorW[] = {'e','r','r','o','r',0};
static const WCHAR exitW[] = {'e','x','i','t',0};
static const WCHAR explicitW[] = {'e','x','p','l','i','c','i','t',0};
static const WCHAR falseW[] = {'f','a','l','s','e',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 getW[] = {'g','e','t',0};
static const WCHAR gotoW[] = {'g','o','t','o',0};
static const WCHAR ifW[] = {'i','f',0};
static const WCHAR impW[] = {'i','m','p',0};
static const WCHAR inW[] = {'i','n',0};
static const WCHAR isW[] = {'i','s',0};
static const WCHAR letW[] = {'l','e','t',0};
static const WCHAR loopW[] = {'l','o','o','p',0};
static const WCHAR meW[] = {'m','e',0};
static const WCHAR modW[] = {'m','o','d',0};
static const WCHAR newW[] = {'n','e','w',0};
static const WCHAR nextW[] = {'n','e','x','t',0};
static const WCHAR notW[] = {'n','o','t',0};
static const WCHAR nothingW[] = {'n','o','t','h','i','n','g',0};
static const WCHAR nullW[] = {'n','u','l','l',0};
static const WCHAR onW[] = {'o','n',0};
static const WCHAR optionW[] = {'o','p','t','i','o','n',0};
static const WCHAR orW[] = {'o','r',0};
static const WCHAR privateW[] = {'p','r','i','v','a','t','e',0};
static const WCHAR propertyW[] = {'p','r','o','p','e','r','t','y',0};
static const WCHAR publicW[] = {'p','u','b','l','i','c',0};
static const WCHAR remW[] = {'r','e','m',0};
static const WCHAR resumeW[] = {'r','e','s','u','m','e',0};
static const WCHAR selectW[] = {'s','e','l','e','c','t',0};
static const WCHAR setW[] = {'s','e','t',0};
static const WCHAR stepW[] = {'s','t','e','p',0};
static const WCHAR stopW[] = {'s','t','o','p',0};
static const WCHAR subW[] = {'s','u','b',0};
static const WCHAR thenW[] = {'t','h','e','n',0};
static const WCHAR toW[] = {'t','o',0};
static const WCHAR trueW[] = {'t','r','u','e',0};
static const WCHAR untilW[] = {'u','n','t','i','l',0};
static const WCHAR wendW[] = {'w','e','n','d',0};
static const WCHAR whileW[] = {'w','h','i','l','e',0};
static const WCHAR xorW[] = {'x','o','r',0};
static const struct {
const WCHAR *word;
int token;
} keywords[] = {
{andW, tAND},
{byrefW, tBYREF},
{byvalW, tBYVAL},
{callW, tCALL},
{caseW, tCASE},
{classW, tCLASS},
{constW, tCONST},
{defaultW, tDEFAULT},
{dimW, tDIM},
{doW, tDO},
{eachW, tEACH},
{elseW, tELSE},
{elseifW, tELSEIF},
{emptyW, tEMPTY},
{endW, tEND},
{eqvW, tEQV},
{errorW, tERROR},
{exitW, tEXIT},
{explicitW, tEXPLICIT},
{falseW, tFALSE},
{forW, tFOR},
{functionW, tFUNCTION},
{getW, tGET},
{gotoW, tGOTO},
{ifW, tIF},
{impW, tIMP},
{inW, tIN},
{isW, tIS},
{letW, tLET},
{loopW, tLOOP},
{meW, tME},
{modW, tMOD},
{newW, tNEW},
{nextW, tNEXT},
{notW, tNOT},
{nothingW, tNOTHING},
{nullW, tNULL},
{onW, tON},
{optionW, tOPTION},
{orW, tOR},
{privateW, tPRIVATE},
{propertyW, tPROPERTY},
{publicW, tPUBLIC},
{remW, tREM},
{resumeW, tRESUME},
{selectW, tSELECT},
{setW, tSET},
{stepW, tSTEP},
{stopW, tSTOP},
{subW, tSUB},
{thenW, tTHEN},
{toW, tTO},
{trueW, tTRUE},
{untilW, tUNTIL},
{wendW, tWEND},
{whileW, tWHILE},
{xorW, tXOR}
};
static inline BOOL is_identifier_char(WCHAR c)
{
return iswalnum(c) || c == '_';
}
static int check_keyword(parser_ctx_t *ctx, const WCHAR *word, const WCHAR **lval)
{
const WCHAR *p1 = ctx->ptr;
const WCHAR *p2 = word;
WCHAR c;
while(p1 < ctx->end && *p2) {
c = towlower(*p1);
if(c != *p2)
return c - *p2;
p1++;
p2++;
}
if(*p2 || (p1 < ctx->end && is_identifier_char(*p1)))
return 1;
ctx->ptr = p1;
*lval = word;
return 0;
}
static int check_keywords(parser_ctx_t *ctx, const WCHAR **lval)
{
int min = 0, max = ARRAY_SIZE(keywords)-1, r, i;
while(min <= max) {
i = (min+max)/2;
r = check_keyword(ctx, keywords[i].word, lval);
if(!r)
return keywords[i].token;
if(r > 0)
min = i+1;
else
max = i-1;
}
return 0;
}
static int parse_identifier(parser_ctx_t *ctx, const WCHAR **ret)
{
const WCHAR *ptr = ctx->ptr++;
WCHAR *str;
int len;
while(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr))
ctx->ptr++;
len = ctx->ptr-ptr;
str = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
if(!str)
return 0;
memcpy(str, ptr, (len+1)*sizeof(WCHAR));
str[len] = 0;
*ret = str;
return tIdentifier;
}
static int parse_string_literal(parser_ctx_t *ctx, const WCHAR **ret)
{
const WCHAR *ptr = ++ctx->ptr;
WCHAR *rptr;
int len = 0;
while(ctx->ptr < ctx->end) {
if(*ctx->ptr == '\n' || *ctx->ptr == '\r') {
FIXME("newline inside string literal\n");
return 0;
}
if(*ctx->ptr == '"') {
if(ctx->ptr[1] != '"')
break;
len--;
ctx->ptr++;
}
ctx->ptr++;
}
if(ctx->ptr == ctx->end) {
FIXME("unterminated string literal\n");
return 0;
}
len += ctx->ptr-ptr;
*ret = rptr = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
if(!rptr)
return 0;
while(ptr < ctx->ptr) {
if(*ptr == '"')
ptr++;
*rptr++ = *ptr++;
}
*rptr = 0;
ctx->ptr++;
return tString;
}
static int parse_numeric_literal(parser_ctx_t *ctx, void **ret)
{
BOOL use_int = TRUE;
LONGLONG d = 0, hlp;
int exp = 0;
double r;
if(*ctx->ptr == '0' && !('0' <= ctx->ptr[1] && ctx->ptr[1] <= '9') && ctx->ptr[1] != '.')
return *ctx->ptr++;
while(ctx->ptr < ctx->end && iswdigit(*ctx->ptr)) {
hlp = d*10 + *(ctx->ptr++) - '0';
if(d>MAXLONGLONG/10 || hlp<0) {
exp++;
break;
}
else
d = hlp;
}
while(ctx->ptr < ctx->end && iswdigit(*ctx->ptr)) {
exp++;
ctx->ptr++;
}
if(*ctx->ptr == '.') {
use_int = FALSE;
ctx->ptr++;
while(ctx->ptr < ctx->end && iswdigit(*ctx->ptr)) {
hlp = d*10 + *(ctx->ptr++) - '0';
if(d>MAXLONGLONG/10 || hlp<0)
break;
d = hlp;
exp--;
}
while(ctx->ptr < ctx->end && iswdigit(*ctx->ptr))
ctx->ptr++;
}
if(*ctx->ptr == 'e' || *ctx->ptr == 'E') {
int e = 0, sign = 1;
ctx->ptr++;
if(*ctx->ptr == '-') {
ctx->ptr++;
sign = -1;
}else if(*ctx->ptr == '+') {
ctx->ptr++;
}
if(!iswdigit(*ctx->ptr)) {
FIXME("Invalid numeric literal\n");
return 0;
}
use_int = FALSE;
do {
e = e*10 + *(ctx->ptr++) - '0';
if(sign == -1 && -e+exp < -(INT_MAX/100)) {
/* The literal will be rounded to 0 anyway. */
while(iswdigit(*ctx->ptr))
ctx->ptr++;
*(double*)ret = 0;
return tDouble;
}
if(sign*e + exp > INT_MAX/100) {
FIXME("Invalid numeric literal\n");
return 0;
}
} while(iswdigit(*ctx->ptr));
exp += sign*e;
}
if(use_int && (LONG)d == d) {
*(LONG*)ret = d;
return tInt;
}
r = exp>=0 ? d*pow(10, exp) : d/pow(10, -exp);
if(isinf(r)) {
FIXME("Invalid numeric literal\n");
return 0;
}
*(double*)ret = r;
return tDouble;
}
static int hex_to_int(WCHAR c)
{
if('0' <= c && c <= '9')
return c-'0';
if('a' <= c && c <= 'f')
return c+10-'a';
if('A' <= c && c <= 'F')
return c+10-'A';
return -1;
}
static int parse_hex_literal(parser_ctx_t *ctx, LONG *ret)
{
const WCHAR *begin = ctx->ptr;
LONG l = 0, d;
while((d = hex_to_int(*++ctx->ptr)) != -1)
l = l*16 + d;
if(begin + 9 /* max digits+1 */ < ctx->ptr || (*ctx->ptr != '&' && is_identifier_char(*ctx->ptr))) {
FIXME("invalid literal\n");
return 0;
}
if(*ctx->ptr == '&')
ctx->ptr++;
*ret = l;
return tInt;
}
static void skip_spaces(parser_ctx_t *ctx)
{
while(*ctx->ptr == ' ' || *ctx->ptr == '\t')
ctx->ptr++;
}
static int comment_line(parser_ctx_t *ctx)
{
static const WCHAR newlineW[] = {'\n','\r',0};
ctx->ptr = wcspbrk(ctx->ptr, newlineW);
if(ctx->ptr)
ctx->ptr++;
else
ctx->ptr = ctx->end;
return tNL;
}
static int parse_next_token(void *lval, parser_ctx_t *ctx)
{
WCHAR c;
skip_spaces(ctx);
if(ctx->ptr == ctx->end)
return ctx->last_token == tNL ? tEOF : tNL;
c = *ctx->ptr;
if('0' <= c && c <= '9')
return parse_numeric_literal(ctx, lval);
if(iswalpha(c)) {
int ret = check_keywords(ctx, lval);
if(!ret)
return parse_identifier(ctx, lval);
if(ret != tREM)
return ret;
c = '\'';
}
switch(c) {
case '\n':
case '\r':
ctx->ptr++;
return tNL;
case '\'':
return comment_line(ctx);
case ':':
case ')':
case ',':
case '=':
case '+':
case '*':
case '/':
case '^':
case '\\':
case '.':
case '_':
return *ctx->ptr++;
case '-':
if(ctx->is_html && ctx->ptr[1] == '-' && ctx->ptr[2] == '>')
return comment_line(ctx);
ctx->ptr++;
return '-';
case '(':
/* NOTE:
* We resolve empty brackets in lexer instead of parser to avoid complex conflicts
* in call statement special case |f()| without 'call' keyword
*/
ctx->ptr++;
skip_spaces(ctx);
if(*ctx->ptr == ')') {
ctx->ptr++;
return tEMPTYBRACKETS;
}
return '(';
case '"':
return parse_string_literal(ctx, lval);
case '&':
if(*++ctx->ptr == 'h' || *ctx->ptr == 'H')
return parse_hex_literal(ctx, lval);
return '&';
case '<':
switch(*++ctx->ptr) {
case '>':
ctx->ptr++;
return tNEQ;
case '=':
ctx->ptr++;
return tLTEQ;
case '!':
if(ctx->is_html && ctx->ptr[1] == '-' && ctx->ptr[2] == '-')
return comment_line(ctx);
}
return '<';
case '>':
if(*++ctx->ptr == '=') {
ctx->ptr++;
return tGTEQ;
}
return '>';
default:
FIXME("Unhandled char %c in %s\n", *ctx->ptr, debugstr_w(ctx->ptr));
}
return 0;
}
int parser_lex(void *lval, parser_ctx_t *ctx)
{
int ret;
if (ctx->last_token == tEXPRESSION)
{
ctx->last_token = tNL;
return tEXPRESSION;
}
while(1) {
ret = parse_next_token(lval, ctx);
if(ret == '_') {
skip_spaces(ctx);
if(*ctx->ptr != '\n' && *ctx->ptr != '\r') {
FIXME("'_' not followed by newline\n");
return 0;
}
if(*ctx->ptr == '\r')
ctx->ptr++;
if(*ctx->ptr == '\n')
ctx->ptr++;
continue;
}
if(ret != tNL || ctx->last_token != tNL)
break;
ctx->last_nl = ctx->ptr-ctx->code;
}
return (ctx->last_token = ret);
}
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