tools/gn/value.h

   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_VALUE_H_
   6 #define TOOLS_GN_VALUE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/logging.h"
  10 #include "base/strings/string_piece.h"
  11 #include "tools/gn/err.h"
  12
  13 class ParseNode;
  14
  15 // Represents a variable value in the interpreter.
  16 class Value {
  17  public:
  18   enum Type {
  19     NONE = 0,
  20     BOOLEAN,
  21     INTEGER,
  22     STRING,
  23     LIST
  24   };
  25
  26   Value();
  27   Value(const ParseNode* origin, Type t);
  28   Value(const ParseNode* origin, bool bool_val);
  29   Value(const ParseNode* origin, int64 int_val);
  30   Value(const ParseNode* origin, std::string str_val);
  31   Value(const ParseNode* origin, const char* str_val);
  32   ~Value();
  33
  34   Type type() const { return type_; }
  35
  36   // Returns a string describing the given type.
  37   static const char* DescribeType(Type t);
  38
  39   // Returns the node that made this. May be NULL.
  40   const ParseNode* origin() const { return origin_; }
  41   void set_origin(const ParseNode* o) { origin_ = o; }
  42
  43   bool& boolean_value() {
  44     DCHECK(type_ == BOOLEAN);
  45     return boolean_value_;
  46   }
  47   const bool& boolean_value() const {
  48     DCHECK(type_ == BOOLEAN);
  49     return boolean_value_;
  50   }
  51
  52   int64& int_value() {
  53     DCHECK(type_ == INTEGER);
  54     return int_value_;
  55   }
  56   const int64& int_value() const {
  57     DCHECK(type_ == INTEGER);
  58     return int_value_;
  59   }
  60
  61   std::string& string_value() {
  62     DCHECK(type_ == STRING);
  63     return string_value_;
  64   }
  65   const std::string& string_value() const {
  66     DCHECK(type_ == STRING);
  67     return string_value_;
  68   }
  69
  70   std::vector<Value>& list_value() {
  71     DCHECK(type_ == LIST);
  72     return list_value_;
  73   }
  74   const std::vector<Value>& list_value() const {
  75     DCHECK(type_ == LIST);
  76     return list_value_;
  77   }
  78
  79   // Converts the given value to a string. Returns true if strings should be
  80   // quoted or the ToString of a string should be the string itself.
  81   std::string ToString(bool quote_strings) const;
  82
  83   // Verifies that the value is of the given type. If it isn't, returns
  84   // false and sets the error.
  85   bool VerifyTypeIs(Type t, Err* err) const;
  86
  87   // Compares values. Only the "value" is compared, not the origin.
  88   bool operator==(const Value& other) const;
  89   bool operator!=(const Value& other) const;
  90
  91  private:
  92   Type type_;
  93   std::string string_value_;
  94   bool boolean_value_;
  95   int64 int_value_;
  96   std::vector<Value> list_value_;
  97   const ParseNode* origin_;
  98 };
  99
 100 #endif  // TOOLS_GN_VALUE_H_