kc3-lang/angle/src/compiler/preprocessor/MacroExpander.h

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• Author : daniel@transgaming.com
  Date : 2012-10-26 18:58:24
  Hash : b401a92b
  Message : Move the new preprocessor out of the 'new' directory. TRAC #21966 Signed-off-by: Daniel Koch Author: Nicolas Capens git-svn-id: https://angleproject.googlecode.com/svn/trunk@1326 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/preprocessor/MacroExpander.h

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifndef COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_
  #define COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_
  
  #include <cassert>
  #include <memory>
  #include <vector>
  
  #include "Lexer.h"
  #include "Macro.h"
  #include "pp_utils.h"
  
  namespace pp
  {
  
  class Diagnostics;
  
  class MacroExpander : public Lexer
  {
    public:
      MacroExpander(Lexer* lexer, MacroSet* macroSet, Diagnostics* diagnostics);
      virtual ~MacroExpander();
  
      virtual void lex(Token* token);
  
    private:
      PP_DISALLOW_COPY_AND_ASSIGN(MacroExpander);
  
      void getToken(Token* token);
      void ungetToken(const Token& token);
      bool isNextTokenLeftParen();
  
      bool pushMacro(const Macro& macro, const Token& identifier);
      void popMacro();
  
      bool expandMacro(const Macro& macro,
                       const Token& identifier,
                       std::vector<Token>* replacements);
  
      typedef std::vector<Token> MacroArg;
      bool collectMacroArgs(const Macro& macro,
                            const Token& identifier,
                            std::vector<MacroArg>* args);
      void replaceMacroParams(const Macro& macro,
                              const std::vector<MacroArg>& args,
                              std::vector<Token>* replacements);
  
      struct MacroContext
      {
          const Macro* macro;
          size_t index;
          std::vector<Token> replacements;
  
          MacroContext() : macro(0), index(0) { }
          bool empty() const { return index == replacements.size(); }
          const Token& get() { return replacements[index++]; }
          void unget() { assert(index > 0); --index; }
      };
  
      Lexer* mLexer;
      MacroSet* mMacroSet;
      Diagnostics* mDiagnostics;
  
      std::auto_ptr<Token> mReserveToken;
      std::vector<MacroContext*> mContextStack;
  };
  
  }  // namespace pp
  #endif  // COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_