Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/tokenizer.h

-// Copyright (c) 2013 The Chromium 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 TOOLS_GN_TOKENIZER_H_
-#define TOOLS_GN_TOKENIZER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/strings/string_piece.h"
-#include "tools/gn/err.h"
-#include "tools/gn/token.h"
-
-class InputFile;
-
-class Tokenizer {
- public:
-  static std::vector<Token> Tokenize(const InputFile* input_file, Err* err);
-
-  // Counts lines in the given buffer (the first line is "1") and returns
-  // the byte offset of the beginning of that line, or (size_t)-1 if there
-  // aren't that many lines in the file. Note that this will return the byte
-  // one past the end of the input if the last character is a newline.
-  //
-  // This is a helper function for error output so that the tokenizer's
-  // notion of lines can be used elsewhere.
-  static size_t ByteOffsetOfNthLine(const base::StringPiece& buf, int n);
-
-  // Returns true if the given offset of the string piece counts as a newline.
-  // The offset must be in the buffer.
-  static bool IsNewline(const base::StringPiece& buffer, size_t offset);
-
-  static bool IsIdentifierFirstChar(char c) {
-    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_';
-  }
-
-  static bool IsIdentifierContinuingChar(char c) {
-    // Also allow digits after the first char.
-    return IsIdentifierFirstChar(c) || (c >= '0' && c <= '9');
-  }
-
- private:
-  // InputFile must outlive the tokenizer and all generated tokens.
-  explicit Tokenizer(const InputFile* input_file, Err* err);
-  ~Tokenizer();
-
-  std::vector<Token> Run();
-
-  void AdvanceToNextToken();
-  Token::Type ClassifyCurrent() const;
-  void AdvanceToEndOfToken(const Location& location, Token::Type type);
-
-  bool IsCurrentWhitespace() const;
-  bool IsCurrentNewline() const;
-  bool IsCurrentStringTerminator(char quote_char) const;
-
-  bool CanIncrement() const { return cur_ < input_.size(); }
-
-  // Increments the current location by one.
-  void Advance();
-
-  // Returns the current character in the file as a location.
-  Location GetCurrentLocation() const;
-
-  Err GetErrorForInvalidToken(const Location& location) const;
-
-  bool done() const { return at_end() || has_error(); }
-
-  bool at_end() const { return cur_ == input_.size(); }
-  char cur_char() const { return input_[cur_]; }
-
-  bool has_error() const { return err_->has_error(); }
-
-  const InputFile* input_file_;
-  const base::StringPiece input_;
-  Err* err_;
-  size_t cur_;  // Byte offset into input buffer.
-
-  int line_number_;
-  int char_in_line_;
-
-  DISALLOW_COPY_AND_ASSIGN(Tokenizer);
-};
-
-#endif  // TOOLS_GN_TOKENIZER_H_