kc3-lang/angle/src/compiler/preprocessor/new/Input.h

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• Author : alokp@chromium.org
  Date : 2011-08-07 05:36:04
  Hash : 4e4b807d
  Message : Beginnings of a new preprocessor. Review URL: http://codereview.appspot.com/4830050 git-svn-id: https://angleproject.googlecode.com/svn/trunk@718 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/preprocessor/new/Input.h

• //
  // 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.
  //
  
  #ifndef COMPILER_PREPROCESSOR_INPUT_H_
  #define COMPILER_PREPROCESSOR_INPUT_H_
  
  namespace pp
  {
  
  // Reads the given set of strings into input buffer.
  // Strips comments.
  class Input
  {
    public:
      Input(int count, const char* const string[], const int length[]);
  
      enum Error
      {
          kErrorNone,
          kErrorUnexpectedEOF
      };
      Error error() const { return mError; }
  
      // Returns the index of string currently being scanned.
      int stringIndex() const { return mIndex; }
      // Returns true if EOF has reached.
      bool eof() const;
  
      // Reads up to bufSize characters into buf.
      // Returns the number of characters read.
      // It replaces each comment by a whitespace. It reads only one string
      // at a time so that the lexer has opportunity to update the string number
      // for meaningful diagnostic messages.
      int read(char* buf, int bufSize);
  
  private:
      enum State
      {
          kStateInitial,
          kStateLineComment,
          kStateBlockComment
      };
  
      int getChar();
      int peekChar();
      // Switches input buffer to the next non-empty string.
      // This is called when the current string is fully read.
      void switchToNextString();
      // Returns true if the given string is empty.
      bool isStringEmpty(int index);
      // Return the length of the given string.
      // Returns a negative value for null-terminated strings.
      int stringLength(int index);
  
      // Input.
      int mCount;
      const char* const* mString;
      const int* mLength;
  
      // Current read position.
      int mIndex;   // Index of string currently being scanned.
      int mSize;    // Size of string already scanned.
  
      // Current error and state.
      Error mError;
      State mState;
  };
  
  }  // namespace pp
  #endif  // COMPILER_PREPROCESSOR_INPUT_H_