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

trunk/src/tools/gn/parser.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_PARSER_H_
-#define TOOLS_GN_PARSER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/gtest_prod_util.h"
-#include "base/memory/scoped_ptr.h"
-#include "tools/gn/err.h"
-#include "tools/gn/parse_tree.h"
-
-// Parses a series of tokens. The resulting AST will refer to the tokens passed
-// to the input, so the tokens an the file data they refer to must outlive your
-// use of the ParseNode.
-class Parser {
- public:
-  // Will return a null pointer and set the err on error.
-  static scoped_ptr<ParseNode> Parse(const std::vector<Token>& tokens,
-                                     Err* err);
-
-  // Alternative to parsing that assumes the input is an expression.
-  static scoped_ptr<ParseNode> ParseExpression(const std::vector<Token>& tokens,
-                                               Err* err);
-
- private:
-  // Vector must be valid for lifetime of call.
-  Parser(const std::vector<Token>& tokens, Err* err);
-  ~Parser();
-
-  scoped_ptr<AccessorNode> ParseAccessor();
-  scoped_ptr<BlockNode> ParseBlock(bool need_braces);
-  scoped_ptr<ConditionNode> ParseCondition();
-  scoped_ptr<ParseNode> ParseExpression();
-  scoped_ptr<ParseNode> ParseExpressionExceptBinaryOperators();
-  scoped_ptr<FunctionCallNode> ParseFunctionCall();
-  scoped_ptr<ListNode> ParseList(const Token& expected_begin,
-                                 const Token& expected_end);
-  scoped_ptr<ParseNode> ParseParenExpression();
-  scoped_ptr<UnaryOpNode> ParseUnaryOp();
-
-  bool IsToken(Token::Type type, char* str) const;
-
-  // Gets an error corresponding to the last token. When we hit an EOF
-  // usually we've already gone beyond the end (or maybe there are no tokens)
-  // so there is some tricky logic to report this.
-  Err MakeEOFError(const std::string& message,
-                   const std::string& help = std::string()) const;
-
-  const Token& cur_token() const { return tokens_[cur_]; }
-
-  bool done() const { return at_end() || has_error(); }
-  bool at_end() const { return cur_ >= tokens_.size(); }
-  bool has_error() const { return err_->has_error(); }
-
-  const Token& next_token() const { return tokens_[cur_ + 1]; }
-  bool has_next_token() const { return cur_ + 1 < tokens_.size(); }
-
-  const std::vector<Token>& tokens_;
-
-  Err* err_;
-
-  // Current index into the tokens.
-  size_t cur_;
-
-  FRIEND_TEST_ALL_PREFIXES(Parser, BinaryOp);
-  FRIEND_TEST_ALL_PREFIXES(Parser, Block);
-  FRIEND_TEST_ALL_PREFIXES(Parser, Condition);
-  FRIEND_TEST_ALL_PREFIXES(Parser, Expression);
-  FRIEND_TEST_ALL_PREFIXES(Parser, FunctionCall);
-  FRIEND_TEST_ALL_PREFIXES(Parser, List);
-  FRIEND_TEST_ALL_PREFIXES(Parser, ParenExpression);
-  FRIEND_TEST_ALL_PREFIXES(Parser, UnaryOp);
-
-  DISALLOW_COPY_AND_ASSIGN(Parser);
-};
-
-#endif  // TOOLS_GN_PARSER_H_