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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_GN_TOKEN_H_
      6 #define TOOLS_GN_TOKEN_H_
      7 
      8 #include "base/strings/string_piece.h"
      9 #include "tools/gn/location.h"
     10 
     11 class Token {
     12  public:
     13   enum Type {
     14     INVALID,
     15     INTEGER,    // 123
     16     STRING,     // "blah"
     17     TRUE_TOKEN,  // Not "TRUE" to avoid collisions with #define in windows.h.
     18     FALSE_TOKEN,
     19 
     20     // Various operators.
     21     EQUAL,
     22     PLUS,
     23     MINUS,
     24     PLUS_EQUALS,
     25     MINUS_EQUALS,
     26     EQUAL_EQUAL,
     27     NOT_EQUAL,
     28     LESS_EQUAL,
     29     GREATER_EQUAL,
     30     LESS_THAN,
     31     GREATER_THAN,
     32     BOOLEAN_AND,
     33     BOOLEAN_OR,
     34     BANG,
     35 
     36     LEFT_PAREN,
     37     RIGHT_PAREN,
     38     LEFT_BRACKET,
     39     RIGHT_BRACKET,
     40     LEFT_BRACE,
     41     RIGHT_BRACE,
     42 
     43     IF,
     44     ELSE,
     45     IDENTIFIER, // foo
     46     COMMA,  // ,
     47     COMMENT,    // #...\n
     48 
     49     UNCLASSIFIED_OPERATOR,  // TODO(scottmg): This shouldn't be necessary.
     50 
     51     NUM_TYPES
     52   };
     53 
     54   Token();
     55   Token(const Location& location, Type t, const base::StringPiece& v);
     56 
     57   Type type() const { return type_; }
     58   const base::StringPiece& value() const { return value_; }
     59   const Location& location() const { return location_; }
     60   LocationRange range() const {
     61     return LocationRange(location_,
     62                          Location(location_.file(), location_.line_number(),
     63                                   location_.char_offset() +
     64                                       static_cast<int>(value_.size())));
     65   }
     66 
     67   // Helper functions for comparing this token to something.
     68   bool IsIdentifierEqualTo(const char* v) const;
     69   bool IsStringEqualTo(const char* v) const;
     70 
     71   // For STRING tokens, returns the string value (no quotes at end, does
     72   // unescaping).
     73   std::string StringValue() const;
     74 
     75  private:
     76   Type type_;
     77   base::StringPiece value_;
     78   Location location_;
     79 };
     80 
     81 #endif  // TOOLS_GN_TOKEN_H_
     82