166 lines
3.5 KiB
C
166 lines
3.5 KiB
C
/*
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* Copyright 2011 Jacek Caban for CodeWeavers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <assert.h>
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#include "vbscript.h"
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#include "parse.h"
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#include "parser.tab.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
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static const WCHAR callW[] = {'c','a','l','l',0};
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static const struct {
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const WCHAR *word;
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int token;
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} keywords[] = {
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{callW, tCALL}
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};
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static inline BOOL is_identifier_char(WCHAR c)
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{
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return isalnumW(c) || c == '_';
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}
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static int check_keyword(parser_ctx_t *ctx, const WCHAR *word)
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{
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const WCHAR *p1 = ctx->ptr;
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const WCHAR *p2 = word;
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WCHAR c;
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while(p1 < ctx->end && *p2) {
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c = tolowerW(*p1);
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if(c != *p2)
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return c - *p2;
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p1++;
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p2++;
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}
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if(*p2 || (p1 < ctx->end && is_identifier_char(*p1)))
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return 1;
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ctx->ptr = p1;
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return 0;
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}
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static int check_keywords(parser_ctx_t *ctx)
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{
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int min = 0, max = sizeof(keywords)/sizeof(keywords[0])-1, r, i;
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while(min <= max) {
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i = (min+max)/2;
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r = check_keyword(ctx, keywords[i].word);
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if(!r)
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return keywords[i].token;
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if(r > 0)
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min = i+1;
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else
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max = i-1;
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}
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return 0;
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}
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static int parse_identifier(parser_ctx_t *ctx, const WCHAR **ret)
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{
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const WCHAR *ptr = ctx->ptr++;
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WCHAR *str;
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int len;
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while(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr))
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ctx->ptr++;
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len = ctx->ptr-ptr;
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str = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
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if(!str)
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return 0;
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memcpy(str, ptr, (len+1)*sizeof(WCHAR));
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str[len] = 0;
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*ret = str;
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return tIdentifier;
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}
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static int parse_next_token(void *lval, parser_ctx_t *ctx)
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{
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WCHAR c;
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while(*ctx->ptr == ' ' || *ctx->ptr == '\t' || *ctx->ptr == '\r')
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ctx->ptr++;
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if(ctx->ptr == ctx->end)
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return ctx->last_token == tNL ? tEOF : tNL;
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c = *ctx->ptr;
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if(isalphaW(c)) {
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int ret = check_keywords(ctx);
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if(!ret)
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return parse_identifier(ctx, lval);
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return ret;
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}
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switch(c) {
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case '\n':
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ctx->ptr++;
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return tNL;
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case '\'':
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ctx->ptr = strchrW(ctx->ptr, '\n');
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if(ctx->ptr)
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ctx->ptr++;
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else
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ctx->ptr = ctx->end;
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return tNL;
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case '(':
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case ')':
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case ',':
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case '=':
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case '+':
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case '-':
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case '*':
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case '/':
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case '^':
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case '\\':
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case '.':
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return *ctx->ptr++;
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default:
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FIXME("Unhandled char %c in %s\n", *ctx->ptr, debugstr_w(ctx->ptr));
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}
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return 0;
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}
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int parser_lex(void *lval, parser_ctx_t *ctx)
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{
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int ret;
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while(1) {
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ret = parse_next_token(lval, ctx);
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if(ret != tNL || ctx->last_token != tNL)
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break;
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ctx->last_nl = ctx->ptr-ctx->code;
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}
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return (ctx->last_token = ret);
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}
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