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//Copyright (C) 2016 LunarG, Inc.
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#include "hlslAttributes.h"
#include <cstdlib>
#include <cctype>

namespace glslang {
    // Map the given string to an attribute enum from TAttributeType,
    // or EatNone if invalid.
    TAttributeType TAttributeMap::attributeFromName(const TString& name)
    {
        // These are case insensitive.
        TString lowername(name);
        std::transform(lowername.begin(), lowername.end(), lowername.begin(), ::tolower);

        if (lowername == "allow_uav_condition")
            return EatAllow_uav_condition;
        else if (lowername == "branch")
            return EatBranch;
        else if (lowername == "call")
            return EatCall;
        else if (lowername == "domain")
            return EatDomain;
        else if (lowername == "earlydepthstencil")
            return EatEarlyDepthStencil;
        else if (lowername == "fastopt")
            return EatFastOpt;
        else if (lowername == "flatten")
            return EatFlatten;
        else if (lowername == "forcecase")
            return EatForceCase;
        else if (lowername == "instance")
            return EatInstance;
        else if (lowername == "maxtessfactor")
            return EatMaxTessFactor;
        else if (lowername == "maxvertexcount")
            return EatMaxVertexCount;
        else if (lowername == "numthreads")
            return EatNumThreads;
        else if (lowername == "outputcontrolpoints")
            return EatOutputControlPoints;
        else if (lowername == "outputtopology")
            return EatOutputTopology;
        else if (lowername == "partitioning")
            return EatPartitioning;
        else if (lowername == "patchconstantfunc")
            return EatPatchConstantFunc;
        else if (lowername == "unroll")
            return EatUnroll;
        else
            return EatNone;
    }

    // Look up entry, inserting if it's not there, and if name is a valid attribute name
    // as known by attributeFromName.
    TAttributeType TAttributeMap::setAttribute(const TString* name, TIntermAggregate* value)
    {
        if (name == nullptr)
            return EatNone;

        const TAttributeType attr = attributeFromName(*name);

        if (attr != EatNone)
            attributes[attr] = value;
 
        return attr;
    }

    // Look up entry (const version), and return aggregate node.  This cannot change the map.
    const TIntermAggregate* TAttributeMap::operator[](TAttributeType attr) const
    {
        const auto entry = attributes.find(attr);

        return (entry == attributes.end()) ? nullptr : entry->second;
    }
    
} // end namespace glslang