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LibJS: Implement rest parameters

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Linus Groh 2020-05-04 16:05:13 +01:00 • committed by Andreas Kling
parent 9df71afdb3
commit 454c1e6bbe
5 changed files with 98 additions and 10 deletions
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18
Libraries/LibJS/Runtime/ScriptFunction.cpp
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@ -27,6 +27,7 @@
#include <AK/Function.h>
#include <LibJS/AST.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ScriptFunction.h>
@ -99,10 +100,19 @@ Value ScriptFunction::call(Interpreter& interpreter)
for (size_t i = 0; i < m_parameters.size(); ++i) {
auto parameter = parameters()[i];
auto value = js_undefined();
if (i < argument_values.size() && !argument_values[i].is_undefined()) {
value = argument_values[i];
} else if (parameter.default_value) {
value = parameter.default_value->execute(interpreter);
if (parameter.is_rest) {
auto* array = Array::create(interpreter.global_object());
for (size_t rest_index = i; rest_index < argument_values.size(); ++rest_index)
array->elements().append(argument_values[rest_index]);
value = Value(array);
} else {
if (i < argument_values.size() && !argument_values[i].is_undefined()) {
value = argument_values[i];
} else if (parameter.default_value) {
value = parameter.default_value->execute(interpreter);
if (interpreter.exception())
return {};
}
}
arguments.append({ parameter.name, value });
interpreter.current_environment()->set(parameter.name, { value, DeclarationKind::Var });