kc3-lang/angle/src/compiler/preprocessor/Preprocessor.cpp

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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/Preprocessor.cpp

• //
  // Copyright (c) 2011 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.
  //
  
  #include "Preprocessor.h"
  
  #include <cassert>
  #include <sstream>
  
  #include "Diagnostics.h"
  #include "DirectiveParser.h"
  #include "Macro.h"
  #include "MacroExpander.h"
  #include "Token.h"
  #include "Tokenizer.h"
  
  namespace pp
  {
  
  struct PreprocessorImpl
  {
      Diagnostics* diagnostics;
      MacroSet macroSet;
      Tokenizer tokenizer;
      DirectiveParser directiveParser;
      MacroExpander macroExpander;
  
      PreprocessorImpl(Diagnostics* diag,
                       DirectiveHandler* directiveHandler) :
          diagnostics(diag),
          tokenizer(diag),
          directiveParser(&tokenizer, &macroSet, diag, directiveHandler),
          macroExpander(&directiveParser, &macroSet, diag)
      {
      }
  };
  
  Preprocessor::Preprocessor(Diagnostics* diagnostics,
                             DirectiveHandler* directiveHandler)
  {
      mImpl = new PreprocessorImpl(diagnostics, directiveHandler);
  }
  
  Preprocessor::~Preprocessor()
  {
      delete mImpl;
  }
  
  bool Preprocessor::init(int count,
                          const char* const string[],
                          const int length[])
  {
      static const int kGLSLVersion = 100;
  
      // Add standard pre-defined macros.
      predefineMacro("__LINE__", 0);
      predefineMacro("__FILE__", 0);
      predefineMacro("__VERSION__", kGLSLVersion);
      predefineMacro("GL_ES", 1);
  
      return mImpl->tokenizer.init(count, string, length);
  }
  
  void Preprocessor::predefineMacro(const char* name, int value)
  {
      std::ostringstream stream;
      stream << value;
  
      Token token;
      token.type = Token::CONST_INT;
      token.text = stream.str();
  
      Macro macro;
      macro.predefined = true;
      macro.type = Macro::kTypeObj;
      macro.name = name;
      macro.replacements.push_back(token);
  
      mImpl->macroSet[name] = macro;
  }
  
  void Preprocessor::lex(Token* token)
  {
      bool validToken = false;
      while (!validToken)
      {
          mImpl->macroExpander.lex(token);
          switch (token->type)
          {
            // We should not be returning internal preprocessing tokens.
            // Convert preprocessing tokens to compiler tokens or report
            // diagnostics.
            case Token::PP_HASH:
              assert(false);
              break;
            case Token::CONST_INT:
            {
              int val = 0;
              if (!token->iValue(&val))
              {
                  // Do not mark the token as invalid.
                  // Just emit the diagnostic and reset value to 0.
                  mImpl->diagnostics->report(Diagnostics::INTEGER_OVERFLOW,
                                             token->location, token->text);
                  token->text.assign("0");
              }
              validToken = true;
              break;
            }
            case Token::CONST_FLOAT:
            {
              float val = 0;
              if (!token->fValue(&val))
              {
                  // Do not mark the token as invalid.
                  // Just emit the diagnostic and reset value to 0.0.
                  mImpl->diagnostics->report(Diagnostics::FLOAT_OVERFLOW,
                                             token->location, token->text);
                  token->text.assign("0.0");
              }
              validToken = true;
              break;
            }
            case Token::PP_NUMBER:
              mImpl->diagnostics->report(Diagnostics::INVALID_NUMBER,
                                         token->location, token->text);
              break;
            case Token::PP_OTHER:
              mImpl->diagnostics->report(Diagnostics::INVALID_CHARACTER,
                                         token->location, token->text);
              break;
            default:
              validToken = true;
              break;
          }
      }
  }
  
  }  // namespace pp