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#include "cru/common/PropertyTree.h"
#include <unordered_map>
#include "cru/common/Exception.h"
namespace cru {
String PropertySubTreeRef::CombineKey(StringView left, StringView right) {
return PropertyTree::CombineKey(left, right);
}
PropertySubTreeRef::PropertySubTreeRef(PropertyTree* tree, String path)
: tree_(tree), path_(std::move(path)) {
Expects(tree);
}
PropertySubTreeRef PropertySubTreeRef::GetParent() const {
for (Index i = path_.size() - 1; i >= 0; i--) {
if (path_[i] == '.') {
return PropertySubTreeRef(tree_, path_.substr(0, i));
}
}
return PropertySubTreeRef(tree_, {});
}
PropertySubTreeRef PropertySubTreeRef::GetChild(const String& key) const {
return PropertySubTreeRef(tree_, CombineKey(path_, key));
}
String PropertySubTreeRef::GetValue(const String& key) const {
return tree_->GetValue(CombineKey(path_, key));
}
void PropertySubTreeRef::SetValue(const String& key, String value) {
tree_->SetValue(CombineKey(path_, key), std::move(value));
}
void PropertySubTreeRef::DeleteValue(const String& key) {
tree_->DeleteValue(CombineKey(path_, key));
}
String PropertyTree::CombineKey(StringView left, StringView right) {
return String(left) + String(left.empty() ? u"" : u".") + String(right);
}
PropertyTree::PropertyTree(std::unordered_map<String, String> values)
: values_(std::move(values)) {}
String PropertyTree::GetValue(const String& key) const {
auto it = values_.find(key);
if (it == values_.end()) {
throw Exception(u"Property tree has no value.");
}
return it->second;
}
void PropertyTree::SetValue(const String& key, String value) {
values_[key] = std::move(value);
}
void PropertyTree::DeleteValue(const String& key) {
auto it = values_.find(key);
if (it != values_.end()) {
values_.erase(it);
}
}
PropertySubTreeRef PropertyTree::GetSubTreeRef(const String& path) {
return PropertySubTreeRef(this, path);
}
} // namespace cru
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