1 files changed, 71 insertions, 0 deletions
diff --git a/src/base/PropertyTree.cpp b/src/base/PropertyTree.cpp
new file mode 100644
index 00000000..8303a706
--- /dev/null
+++ b/src/base/PropertyTree.cpp
@@ -0,0 +1,71 @@
+#include "cru/base/PropertyTree.h"
+#include <unordered_map>
+#include "cru/base/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