hlslScanContext.h

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

#ifndef HLSLSCANCONTEXT_H_
#define HLSLSCANCONTEXT_H_

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

namespace glslang {

class TPpContext;
class TPpToken;


//
// Everything needed to fully describe a token.
//
struct HlslToken {
 HlslToken() : string(nullptr) { loc.init(); }
 TSourceLoc loc; // location of token in the source
 EHlslTokenClass tokenClass; // what kind of token it is
 union { // what data the token holds
 glslang::TString *string; // for identifiers
 int i; // for literals
 unsigned int u;
 bool b;
 double d;
 };
};

//
// The state of scanning and translating raw tokens to slightly richer
// semantics, like knowing if an identifier is an existing symbol, or
// user-defined type.
//
class HlslScanContext {
public:
 HlslScanContext(TParseContextBase& _parseContext, TPpContext& ppContext)
 : _parseContext(_parseContext), ppContext(ppContext) { }
 virtual ~HlslScanContext() { }

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

 void tokenize(HlslToken&);
 glslang::TBuiltInVariable mapSemantic(const char*);

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;
 TSourceLoc loc;
 TPpToken* ppToken;
 HlslToken* parserToken;

 const char* tokenText;
 EHlslTokenClass keyword;
};

} // end namespace glslang

#endif // HLSLSCANCONTEXT_H_