Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Runtime/Reference.h

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * 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 <AK/String.h>
+#include <LibJS/Runtime/PropertyName.h>
+#include <LibJS/Runtime/Value.h>
+
+namespace JS {
+
+class Reference {
+public:
+    Reference() { }
+    Reference(Value base, const PropertyName& name, bool strict = false)
+        : m_base(base)
+        , m_name(name)
+        , m_strict(strict)
+    {
+    }
+
+    enum LocalVariableTag { LocalVariable };
+    Reference(LocalVariableTag, const String& name, bool strict = false)
+        : m_base(js_null())
+        , m_name(name)
+        , m_strict(strict)
+        , m_local_variable(true)
+    {
+    }
+
+    enum GlobalVariableTag { GlobalVariable };
+    Reference(GlobalVariableTag, const String& name, bool strict = false)
+        : m_base(js_null())
+        , m_name(name)
+        , m_strict(strict)
+        , m_global_variable(true)
+    {
+    }
+
+    Value base() const { return m_base; }
+    const PropertyName& name() const { return m_name; }
+    bool is_strict() const { return m_strict; }
+
+    bool is_unresolvable() const { return m_base.is_undefined(); }
+    bool is_property() const
+    {
+        return m_base.is_object() || has_primitive_base();
+    }
+
+    bool has_primitive_base() const
+    {
+        return m_base.is_boolean() || m_base.is_string() || m_base.is_number();
+    }
+
+    bool is_local_variable() const
+    {
+        return m_local_variable;
+    }
+
+    bool is_global_variable() const
+    {
+        return m_global_variable;
+    }
+
+    void put(GlobalObject&, Value);
+    Value get(GlobalObject&);
+
+private:
+    void throw_reference_error(GlobalObject&);
+
+    Value m_base { js_undefined() };
+    PropertyName m_name;
+    bool m_strict { false };
+    bool m_local_variable { false };
+    bool m_global_variable { false };
+};
+
+}