Source/JavaScriptCore/parser/ParserModes.h

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 *
 * Redistribution and use in source and binary forms, with or without
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#ifndef ParserModes_h
#define ParserModes_h

#include "Identifier.h"

namespace JSC {

enum class JSParserStrictMode { NotStrict, Strict };
enum class JSParserBuiltinMode { NotBuiltin, Builtin };
enum class JSParserCodeType { Program, Function, Module };

enum class ConstructorKind { None, Base, Derived };
enum class SuperBinding { Needed, NotNeeded };

enum DebuggerMode { DebuggerOff, DebuggerOn };

enum class FunctionMode { FunctionExpression, FunctionDeclaration, MethodDefinition };

enum class SourceParseMode : uint8_t {
    NormalFunctionMode,
    GeneratorBodyMode,
    GeneratorWrapperFunctionMode,
    GetterMode,
    SetterMode,
    MethodMode,
    ArrowFunctionMode,
    ProgramMode,
    ModuleAnalyzeMode,
    ModuleEvaluateMode
};

inline bool isFunctionParseMode(SourceParseMode parseMode)
{
    switch (parseMode) {
    case SourceParseMode::NormalFunctionMode:
    case SourceParseMode::GeneratorBodyMode:
    case SourceParseMode::GeneratorWrapperFunctionMode:
    case SourceParseMode::GetterMode:
    case SourceParseMode::SetterMode:
    case SourceParseMode::MethodMode:
    case SourceParseMode::ArrowFunctionMode:
        return true;

    case SourceParseMode::ProgramMode:
    case SourceParseMode::ModuleAnalyzeMode:
    case SourceParseMode::ModuleEvaluateMode:
        return false;
    }
    RELEASE_ASSERT_NOT_REACHED();
    return false;
}

inline bool isModuleParseMode(SourceParseMode parseMode)
{
    switch (parseMode) {
    case SourceParseMode::ModuleAnalyzeMode:
    case SourceParseMode::ModuleEvaluateMode:
        return true;

    case SourceParseMode::NormalFunctionMode:
    case SourceParseMode::GeneratorBodyMode:
    case SourceParseMode::GeneratorWrapperFunctionMode:
    case SourceParseMode::GetterMode:
    case SourceParseMode::SetterMode:
    case SourceParseMode::MethodMode:
    case SourceParseMode::ArrowFunctionMode:
    case SourceParseMode::ProgramMode:
        return false;
    }
    RELEASE_ASSERT_NOT_REACHED();
    return false;
}

inline bool isProgramParseMode(SourceParseMode parseMode)
{
    switch (parseMode) {
    case SourceParseMode::ProgramMode:
        return true;

    case SourceParseMode::NormalFunctionMode:
    case SourceParseMode::GeneratorBodyMode:
    case SourceParseMode::GeneratorWrapperFunctionMode:
    case SourceParseMode::GetterMode:
    case SourceParseMode::SetterMode:
    case SourceParseMode::MethodMode:
    case SourceParseMode::ArrowFunctionMode:
    case SourceParseMode::ModuleAnalyzeMode:
    case SourceParseMode::ModuleEvaluateMode:
        return false;
    }
    RELEASE_ASSERT_NOT_REACHED();
    return false;
}

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

    if (functionMode != 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 uint16_t CodeFeatures;

const CodeFeatures NoFeatures =                       0;
const CodeFeatures EvalFeature =                 1 << 0;
const CodeFeatures ArgumentsFeature =            1 << 1;
const CodeFeatures WithFeature =                 1 << 2;
const CodeFeatures ThisFeature =                 1 << 3;
const CodeFeatures StrictModeFeature =           1 << 4;
const CodeFeatures ShadowsArgumentsFeature =     1 << 5;
const CodeFeatures ArrowFunctionFeature =        1 << 6;
const CodeFeatures ArrowFunctionContextFeature = 1 << 7;
const CodeFeatures SuperCallFeature =            1 << 8;
const CodeFeatures SuperPropertyFeature =        1 << 9;
const CodeFeatures NewTargetFeature =            1 << 10;

const CodeFeatures AllFeatures = EvalFeature | ArgumentsFeature | WithFeature | ThisFeature | StrictModeFeature | ShadowsArgumentsFeature | ArrowFunctionFeature | ArrowFunctionContextFeature |
    SuperCallFeature | SuperPropertyFeature | NewTargetFeature;

typedef uint8_t InnerArrowFunctionCodeFeatures;
    
const InnerArrowFunctionCodeFeatures NoInnerArrowFunctionFeatures =                0;
const InnerArrowFunctionCodeFeatures EvalInnerArrowFunctionFeature =          1 << 0;
const InnerArrowFunctionCodeFeatures ArgumentsInnerArrowFunctionFeature =     1 << 1;
const InnerArrowFunctionCodeFeatures ThisInnerArrowFunctionFeature =          1 << 2;
const InnerArrowFunctionCodeFeatures SuperCallInnerArrowFunctionFeature =     1 << 3;
const InnerArrowFunctionCodeFeatures SuperPropertyInnerArrowFunctionFeature = 1 << 4;
const InnerArrowFunctionCodeFeatures NewTargetInnerArrowFunctionFeature =     1 << 5;
    
const InnerArrowFunctionCodeFeatures AllInnerArrowFunctionCodeFeatures = EvalInnerArrowFunctionFeature | ArgumentsInnerArrowFunctionFeature | ThisInnerArrowFunctionFeature | SuperCallInnerArrowFunctionFeature | SuperPropertyInnerArrowFunctionFeature | NewTargetInnerArrowFunctionFeature;
} // namespace JSC

#endif // ParserModes_h