LibJS: Add JSON.stringify

1 files changed, 59 insertions, 0 deletions

diff --git a/Libraries/LibJS/Runtime/JSONObject.h b/Libraries/LibJS/Runtime/JSONObject.h
new file mode 100644
index 0000000000..fa5491b210
--- /dev/null
+++ b/Libraries/LibJS/Runtime/JSONObject.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Object.h>
+
+namespace JS {
+
+class JSONObject final : public Object {
+public:
+    JSONObject();
+    virtual ~JSONObject() override;
+
+private:
+    struct StringifyState {
+        Function* replacer_function { nullptr };
+        HashTable<Object*> seen_objects;
+        String indent { String::empty() };
+        String gap;
+        Optional<Vector<String>> property_list;
+    };
+
+    virtual const char* class_name() const override { return "JSONObject"; }
+
+    // Stringify helpers
+    static String serialize_json_property(Interpreter&, StringifyState&, const PropertyName& key, Object* holder);
+    static String serialize_json_object(Interpreter&, StringifyState&, Object&);
+    static String serialize_json_array(Interpreter&, StringifyState&, Object&);
+    static String quote_json_string(String);
+
+    static Value stringify(Interpreter&);
+    static Value parse(Interpreter&);
+};
+
+}