//
//Copyright (C) 2016 Google, Inc.
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//
// This holds context specific to the GLSL scanner, which
// sits between the preprocessor scanner and parser.
//

#ifndef HLSLSCANCONTEXT_H_
#define HLSLSCANCONTEXT_H_

#include "../glslang/MachineIndependent/ParseHelper.h"
#include "hlslTokens.h"

namespace glslang {

class TPpContext;
class TPpToken;

struct HlslToken {
    TSourceLoc loc;
    EHlslTokenClass tokenClass;
    bool isType;
    union {
        glslang::TString *string;
        int i;
        unsigned int u;
        bool b;
        double d;
    };
    glslang::TSymbol* symbol;
};

class HlslScanContext {
public:
    HlslScanContext(TParseContextBase& parseContext, TPpContext& ppContext)
        : parseContext(parseContext), ppContext(ppContext), afterType(false), field(false) { }
    virtual ~HlslScanContext() { }

    static void fillInKeywordMap();
    static void deleteKeywordMap();

    void tokenize(HlslToken&);

protected:
    HlslScanContext(HlslScanContext&);
    HlslScanContext& operator=(HlslScanContext&);

    EHlslTokenClass tokenizeClass(HlslToken&);
    EHlslTokenClass tokenizeIdentifier();
    EHlslTokenClass identifierOrType();
    EHlslTokenClass reservedWord();
    EHlslTokenClass identifierOrReserved(bool reserved);
    EHlslTokenClass nonreservedKeyword(int version);

    TParseContextBase& parseContext;
    TPpContext& ppContext;
    bool afterType;           // true if we've recognized a type, so can only be looking for an identifier
    bool field;               // true if we're on a field, right after a '.'
    TSourceLoc loc;
    TPpToken* ppToken;
    HlslToken* parserToken;

    const char* tokenText;
    EHlslTokenClass keyword;
};

} // end namespace glslang

#endif // HLSLSCANCONTEXT_H_