tools/gn/value.cc

   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 #include "tools/gn/value.h"
   6
   7 #include "base/strings/string_number_conversions.h"
   8 #include "base/strings/string_util.h"
   9 #include "tools/gn/scope.h"
  10
  11 Value::Value()
  12     : type_(NONE),
  13       boolean_value_(false),
  14       int_value_(0),
  15       origin_(NULL) {
  16 }
  17
  18 Value::Value(const ParseNode* origin, Type t)
  19     : type_(t),
  20       boolean_value_(false),
  21       int_value_(0),
  22       origin_(origin) {
  23 }
  24
  25 Value::Value(const ParseNode* origin, bool bool_val)
  26     : type_(BOOLEAN),
  27       boolean_value_(bool_val),
  28       int_value_(0),
  29       origin_(origin) {
  30 }
  31
  32 Value::Value(const ParseNode* origin, int64 int_val)
  33     : type_(INTEGER),
  34       boolean_value_(false),
  35       int_value_(int_val),
  36       origin_(origin) {
  37 }
  38
  39 Value::Value(const ParseNode* origin, std::string str_val)
  40     : type_(STRING),
  41       string_value_(),
  42       boolean_value_(false),
  43       int_value_(0),
  44       origin_(origin) {
  45   string_value_.swap(str_val);
  46 }
  47
  48 Value::Value(const ParseNode* origin, const char* str_val)
  49     : type_(STRING),
  50       string_value_(str_val),
  51       boolean_value_(false),
  52       int_value_(0),
  53       origin_(origin) {
  54 }
  55
  56 Value::Value(const ParseNode* origin, scoped_ptr<Scope> scope)
  57     : type_(SCOPE),
  58       string_value_(),
  59       boolean_value_(false),
  60       int_value_(0),
  61       scope_value_(scope.Pass()),
  62       origin_(origin) {
  63 }
  64
  65 Value::Value(const Value& other)
  66     : type_(other.type_),
  67       string_value_(other.string_value_),
  68       boolean_value_(other.boolean_value_),
  69       int_value_(other.int_value_),
  70       list_value_(other.list_value_),
  71       origin_(other.origin_) {
  72   if (type() == SCOPE && other.scope_value_.get())
  73     scope_value_ = other.scope_value_->MakeClosure();
  74 }
  75
  76 Value::~Value() {
  77 }
  78
  79 Value& Value::operator=(const Value& other) {
  80   type_ = other.type_;
  81   string_value_ = other.string_value_;
  82   boolean_value_ = other.boolean_value_;
  83   int_value_ = other.int_value_;
  84   list_value_ = other.list_value_;
  85   if (type() == SCOPE && other.scope_value_.get())
  86     scope_value_ = other.scope_value_->MakeClosure();
  87   origin_ = other.origin_;
  88   return *this;
  89 }
  90
  91 void Value::RecursivelySetOrigin(const ParseNode* origin) {
  92   set_origin(origin);
  93   if (type_ == Value::LIST) {
  94     for (size_t i = 0; i < list_value_.size(); i++)
  95       list_value_[i].RecursivelySetOrigin(origin);
  96   }
  97 }
  98
  99 // static
 100 const char* Value::DescribeType(Type t) {
 101   switch (t) {
 102     case NONE:
 103       return "none";
 104     case BOOLEAN:
 105       return "boolean";
 106     case INTEGER:
 107       return "integer";
 108     case STRING:
 109       return "string";
 110     case LIST:
 111       return "list";
 112     case SCOPE:
 113       return "scope";
 114     default:
 115       NOTREACHED();
 116       return "UNKNOWN";
 117   }
 118 }
 119
 120 void Value::SetScopeValue(scoped_ptr<Scope> scope) {
 121   DCHECK(type_ == SCOPE);
 122   scope_value_ = scope.Pass();
 123 }
 124
 125 std::string Value::ToString(bool quote_string) const {
 126   switch (type_) {
 127     case NONE:
 128       return "<void>";
 129     case BOOLEAN:
 130       return boolean_value_ ? "true" : "false";
 131     case INTEGER:
 132       return base::Int64ToString(int_value_);
 133     case STRING:
 134       if (quote_string) {
 135         std::string escaped = string_value_;
 136         // First escape all special uses of a backslash.
 137         ReplaceSubstringsAfterOffset(&escaped, 0, "\\$", "\\\\$");
 138         ReplaceSubstringsAfterOffset(&escaped, 0, "\\\"", "\\\\\"");
 139
 140         // Now escape special chars.
 141         ReplaceSubstringsAfterOffset(&escaped, 0, "$", "\\$");
 142         ReplaceSubstringsAfterOffset(&escaped, 0, "\"", "\\\"");
 143         return "\"" + escaped + "\"";
 144       }
 145       return string_value_;
 146     case LIST: {
 147       std::string result = "[";
 148       for (size_t i = 0; i < list_value_.size(); i++) {
 149         if (i > 0)
 150           result += ", ";
 151         result += list_value_[i].ToString(true);
 152       }
 153       result.push_back(']');
 154       return result;
 155     }
 156     case SCOPE:
 157       return std::string("<scope>");
 158   }
 159   return std::string();
 160 }
 161
 162 bool Value::VerifyTypeIs(Type t, Err* err) const {
 163   if (type_ == t)
 164     return true;
 165
 166   *err = Err(origin(), std::string("This is not a ") + DescribeType(t) + ".");
 167   return false;
 168 }
 169
 170 bool Value::operator==(const Value& other) const {
 171   if (type_ != other.type_)
 172     return false;
 173
 174   switch (type_) {
 175     case Value::BOOLEAN:
 176       return boolean_value() == other.boolean_value();
 177     case Value::INTEGER:
 178       return int_value() == other.int_value();
 179     case Value::STRING:
 180       return string_value() == other.string_value();
 181     case Value::LIST:
 182       if (list_value().size() != other.list_value().size())
 183         return false;
 184       for (size_t i = 0; i < list_value().size(); i++) {
 185         if (list_value()[i] != other.list_value()[i])
 186           return false;
 187       }
 188       return true;
 189     case Value::SCOPE:
 190       // Scopes are always considered not equal because there's currently
 191       // no use case for comparing them, and it requires a bunch of complex
 192       // iteration code.
 193       return false;
 194     default:
 195       return false;
 196   }
 197 }
 198
 199 bool Value::operator!=(const Value& other) const {
 200   return !operator==(other);
 201 }