Source/JavaScriptCore/yarr/YarrSyntaxChecker.cpp

/*
 * Copyright (C) 2011, 2016 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
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 * 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 "YarrSyntaxChecker.h"

#include "YarrFlags.h"
#include "YarrParser.h"
#include <wtf/Optional.h>

namespace JSC { namespace Yarr {

class SyntaxChecker {
public:
    void assertionBOL() {}
    void assertionEOL() {}
    void assertionWordBoundary(bool) {}
    void atomPatternCharacter(UChar32) {}
    void atomBuiltInCharacterClass(BuiltInCharacterClassID, bool) {}
    void atomCharacterClassBegin(bool = false) {}
    void atomCharacterClassAtom(UChar) {}
    void atomCharacterClassRange(UChar, UChar) {}
    void atomCharacterClassBuiltIn(BuiltInCharacterClassID, bool) {}
    void atomCharacterClassEnd() {}
    void atomParenthesesSubpatternBegin(bool = true, Optional<String> = WTF::nullopt) {}
    void atomParentheticalAssertionBegin(bool = false) {}
    void atomParenthesesEnd() {}
    void atomBackReference(unsigned) {}
    void atomNamedBackReference(const String&) {}
    bool isValidNamedForwardReference(const String&) { return true; }
    void atomNamedForwardReference(const String&) {}
    void quantifyAtom(unsigned, unsigned, bool) {}
    void disjunction() {}
};

ErrorCode checkSyntax(const String& pattern, const String& flags)
{
    SyntaxChecker syntaxChecker;

    auto parsedFlags = parseFlags(flags);
    if (!parsedFlags)
        return ErrorCode::InvalidRegularExpressionFlags;

    return parse(syntaxChecker, pattern, parsedFlags->contains(Flags::Unicode));
}

}} // JSC::Yarr