// 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.

#include "tools/gn/value.h"

#include "base/strings/string_number_conversions.h"

Value::Value()
    : type_(NONE),
      boolean_value_(false),
      int_value_(0),
      scope_value_(NULL),
      origin_(NULL) {
}

Value::Value(const ParseNode* origin, Type t)
    : type_(t),
      boolean_value_(false),
      int_value_(0),
      scope_value_(NULL),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, bool bool_val)
    : type_(BOOLEAN),
      boolean_value_(bool_val),
      int_value_(0),
      scope_value_(NULL),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, int64 int_val)
    : type_(INTEGER),
      boolean_value_(false),
      int_value_(int_val),
      scope_value_(NULL),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, std::string str_val)
    : type_(STRING),
      string_value_(),
      boolean_value_(false),
      int_value_(0),
      scope_value_(NULL),
      origin_(origin) {
  string_value_.swap(str_val);
}

Value::Value(const ParseNode* origin, const char* str_val)
    : type_(STRING),
      string_value_(str_val),
      boolean_value_(false),
      int_value_(0),
      scope_value_(NULL),
      origin_(origin) {
}

Value::Value(const ParseNode* origin, Scope* scope)
    : type_(SCOPE),
      string_value_(),
      boolean_value_(false),
      int_value_(0),
      scope_value_(scope),
      origin_(origin) {
}

Value::~Value() {
}

void Value::RecursivelySetOrigin(const ParseNode* origin) {
  set_origin(origin);
  if (type_ == Value::LIST) {
    for (size_t i = 0; i < list_value_.size(); i++)
      list_value_[i].RecursivelySetOrigin(origin);
  }
}

// static
const char* Value::DescribeType(Type t) {
  switch (t) {
    case NONE:
      return "none";
    case BOOLEAN:
      return "boolean";
    case INTEGER:
      return "integer";
    case STRING:
      return "string";
    case LIST:
      return "list";
    case SCOPE:
      return "scope";
    default:
      NOTREACHED();
      return "UNKNOWN";
  }
}

std::string Value::ToString(bool quote_string) const {
  switch (type_) {
    case NONE:
      return "<void>";
    case BOOLEAN:
      return boolean_value_ ? "true" : "false";
    case INTEGER:
      return base::Int64ToString(int_value_);
    case STRING:
      if (quote_string)
        return "\"" + string_value_ + "\"";
      return string_value_;
    case LIST: {
      std::string result = "[";
      for (size_t i = 0; i < list_value_.size(); i++) {
        if (i > 0)
          result += ", ";
        result += list_value_[i].ToString(true);
      }
      result.push_back(']');
      return result;
    }
    case SCOPE:
      return std::string("<scope>");
  }
  return std::string();
}

bool Value::VerifyTypeIs(Type t, Err* err) const {
  if (type_ == t)
    return true;

  *err = Err(origin(), std::string("This is not a ") + DescribeType(t) + ".");
  return false;
}

bool Value::operator==(const Value& other) const {
  if (type_ != other.type_)
    return false;

  switch (type_) {
    case Value::BOOLEAN:
      return boolean_value() == other.boolean_value();
    case Value::INTEGER:
      return int_value() == other.int_value();
    case Value::STRING:
      return string_value() == other.string_value();
    case Value::LIST:
      if (list_value().size() != other.list_value().size())
        return false;
      for (size_t i = 0; i < list_value().size(); i++) {
        if (list_value()[i] != other.list_value()[i])
          return false;
      }
      return true;
    case Value::SCOPE:
      // Its not clear what people mean when comparing scope values, so we test
      // for scope identity and not contents equality.
      return scope_value() == other.scope_value();
    default:
      return false;
  }
}

bool Value::operator!=(const Value& other) const {
  return !operator==(other);
}