source: webkit/trunk/JavaScriptCore/wrec/WREC.cpp@ 38929

/*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#include "config.h"
#include "WREC.h"

#if ENABLE(WREC)

#include "CharacterClassConstructor.h"
#include "Interpreter.h"
#include "WRECFunctors.h"
#include "WRECParser.h"
#include "pcre_internal.h"

using namespace WTF;

namespace JSC { namespace WREC {

// This limit comes from the limit set in PCRE
static const int MaxPatternSize = (1 << 16);

CompiledRegExp Generator::compileRegExp(Interpreter* interpreter, const UString& pattern, unsigned* numSubpatterns_ptr, const char** error_ptr, bool ignoreCase, bool multiline)
{
    if (pattern.size() > MaxPatternSize) {
        *error_ptr = "Regular expression too large.";
        return 0;
    }

    Parser parser(pattern, ignoreCase, multiline, interpreter->assemblerBuffer());
    Generator& generator = parser.generator();
    MacroAssembler::JumpList failures;

    generator.generateEnter();
    generator.generateSaveIndex();

    Label beginPattern(&generator);
    parser.parsePattern(failures);
    generator.generateReturnSuccess();

    failures.link();
    generator.generateJumpIfEndOfInput(failures);
    generator.generateIncrementIndex();
    parser.parsePattern(failures);
    generator.generateReturnSuccess();

    failures.link();
    generator.generateIncrementIndex();
    generator.generateJumpIfNotEndOfInput(beginPattern);
    generator.generateReturnFailure();

    if (parser.error()) {
        *error_ptr = "Regular expression malformed.";
        return 0;
    }

    *numSubpatterns_ptr = parser.numSubpatterns();
    return reinterpret_cast<CompiledRegExp>(generator.copyCode());
}

} } // namespace JSC::WREC

#endif // ENABLE(WREC)