JavaScriptCore-7600.1.4.15.12.tar.gz

[apple/javascriptcore.git] / parser / ParserModes.h

/*
 * Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
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 *
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#ifndef ParserModes_h
#define ParserModes_h

#include "Identifier.h"

namespace JSC {

enum JSParserStrictness { JSParseNormal, JSParseBuiltin, JSParseStrict };
enum JSParserMode { JSParseProgramCode, JSParseFunctionCode };

enum ProfilerMode { ProfilerOff, ProfilerOn };
enum DebuggerMode { DebuggerOff, DebuggerOn };

enum FunctionMode { FunctionExpression, FunctionDeclaration };

inline bool functionNameIsInScope(const Identifier& name, FunctionMode functionMode)
{
    if (name.isNull())
        return false;

    if (functionMode != FunctionExpression)
        return false;

    return true;
}

inline bool functionNameScopeIsDynamic(bool usesEval, bool isStrictMode)
{
    // If non-strict eval is in play, a function gets a separate object in the scope chain for its name.
    // This enables eval to declare and then delete a name that shadows the function's name.

    if (!usesEval)
        return false;

    if (isStrictMode)
        return false;

    return true;
}

typedef unsigned CodeFeatures;

const CodeFeatures NoFeatures = 0;
const CodeFeatures EvalFeature = 1 << 0;
const CodeFeatures ArgumentsFeature = 1 << 1;
const CodeFeatures WithFeature = 1 << 2;
const CodeFeatures CatchFeature = 1 << 3;
const CodeFeatures ThisFeature = 1 << 4;
const CodeFeatures StrictModeFeature = 1 << 5;
const CodeFeatures ShadowsArgumentsFeature = 1 << 6;
const CodeFeatures ModifiedParameterFeature = 1 << 7;

const CodeFeatures AllFeatures = EvalFeature | ArgumentsFeature | WithFeature | CatchFeature | ThisFeature | StrictModeFeature | ShadowsArgumentsFeature | ModifiedParameterFeature;

} // namespace JSC

#endif // ParserModes_h