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24cce3674b
This patch teaches UpdateExpression how to use a Reference. Some other changes were necessary to keep tests working: A Reference can now also refer to a local or global variable. This is not fully aligned with the spec since we don't have a Record concept.
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/Reference.h>
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namespace JS {
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void Reference::put(Interpreter& interpreter, Value value)
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{
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// NOTE: The caller is responsible for doing an exception check after assign().
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if (is_unresolvable()) {
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throw_reference_error(interpreter);
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return;
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}
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if (is_local_variable() || is_global_variable()) {
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if (is_local_variable())
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interpreter.set_variable(m_name.to_string(), value);
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else
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interpreter.global_object().put(m_name, value);
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return;
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}
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auto* object = base().to_object(interpreter.heap());
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if (!object)
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return;
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object->put(m_name, value);
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}
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void Reference::throw_reference_error(Interpreter& interpreter)
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{
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auto property_name = m_name.to_string();
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String message;
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if (property_name.is_empty())
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message = "Unresolvable reference";
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else
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message = String::format("'%s' not known", property_name.characters());
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interpreter.throw_exception<ReferenceError>(message);
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}
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Value Reference::get(Interpreter& interpreter)
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{
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// NOTE: The caller is responsible for doing an exception check after fetch().
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if (is_unresolvable()) {
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throw_reference_error(interpreter);
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return {};
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}
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if (is_local_variable() || is_global_variable()) {
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Value value;
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if (is_local_variable())
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value = interpreter.get_variable(m_name.to_string());
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else
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value = interpreter.global_object().get(m_name);
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if (interpreter.exception())
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return {};
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if (value.is_empty()) {
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throw_reference_error(interpreter);
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return {};
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}
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return value;
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}
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auto* object = base().to_object(interpreter.heap());
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if (!object)
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return {};
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return object->get(m_name).value_or(js_undefined());
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}
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}
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