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LibJS: Implement parsing and evaluation for AssignmentPatterns

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e.g. `[...foo] = bar` can now be evaluated :^)
This commit is contained in:
Ali Mohammad Pur 2021-07-11 01:16:17 +04:30 • committed by Linus Groh
parent 7fc6cd6b20
commit 1a9518ebe3
7 changed files with 104 additions and 40 deletions
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76
Userland/Libraries/LibJS/AST.cpp
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@ -1484,11 +1484,18 @@ Value AssignmentExpression::execute(Interpreter& interpreter, GlobalObject& glob
{
InterpreterNodeScope node_scope { interpreter, *this };
#define EXECUTE_LHS() \
do { \
if (auto* ptr = m_lhs.get_pointer<NonnullRefPtr<Expression>>()) { \
lhs_result = (*ptr)->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
} \
} while (0)
#define EXECUTE_LHS_AND_RHS() \
do { \
lhs_result = m_lhs->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
EXECUTE_LHS(); \
rhs_result = m_rhs->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
@ -1548,25 +1555,19 @@ Value AssignmentExpression::execute(Interpreter& interpreter, GlobalObject& glob
rhs_result = unsigned_right_shift(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::AndAssignment:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
EXECUTE_LHS();
if (!lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::OrAssignment:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
EXECUTE_LHS();
if (lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::NullishAssignment:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
EXECUTE_LHS();
if (!lhs_result.is_nullish())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
@ -1575,26 +1576,42 @@ Value AssignmentExpression::execute(Interpreter& interpreter, GlobalObject& glob
if (interpreter.exception())
return {};
auto reference = m_lhs->to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
return m_lhs.visit(
[&](NonnullRefPtr<Expression>& lhs) -> JS::Value {
auto reference = lhs->to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
if (m_op == AssignmentOp::Assignment) {
rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
if (m_op == AssignmentOp::Assignment) {
rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
if (reference.is_unresolvable()) {
interpreter.vm().throw_exception<ReferenceError>(global_object, ErrorType::InvalidLeftHandAssignment);
return {};
}
if (reference.is_unresolvable()) {
interpreter.vm().throw_exception<ReferenceError>(global_object, ErrorType::InvalidLeftHandAssignment);
return {};
}
reference.put_value(global_object, rhs_result);
if (interpreter.exception())
return {};
reference.put_value(global_object, rhs_result);
if (interpreter.exception())
return {};
return rhs_result;
return rhs_result;
},
[&](NonnullRefPtr<BindingPattern>& pattern) -> JS::Value {
VERIFY(m_op == AssignmentOp::Assignment);
rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
interpreter.vm().assign(pattern, rhs_result, global_object);
if (interpreter.exception())
return {};
return rhs_result;
});
}
Value UpdateExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
@ -1693,7 +1710,7 @@ void AssignmentExpression::dump(int indent) const
ASTNode::dump(indent);
print_indent(indent + 1);
outln("{}", op_string);
m_lhs->dump(indent + 1);
m_lhs.visit([&](auto& lhs) { lhs->dump(indent + 1); });
m_rhs->dump(indent + 1);
}
@ -2395,5 +2412,4 @@ void ScopeNode::add_hoisted_function(NonnullRefPtr<FunctionDeclaration> hoisted_
{
m_hoisted_functions.append(hoisted_function);
}
}