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LibJS: Handle "for" statements with empty initializer and updater

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This commit is contained in:
Andreas Kling 2020-03-25 16:14:18 +01:00
parent 30d24af54a
commit 6c9d2cfa5e
3 changed files with 26 additions and 2 deletions
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2
Libraries/LibJS/AST.cpp
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@ -126,7 +126,7 @@ Value ForStatement::execute(Interpreter& interpreter) const
{
RefPtr<BlockStatement> wrapper;
if (m_init->is_variable_declaration() && static_cast<const VariableDeclaration*>(m_init.ptr())->declaration_type() != DeclarationType::Var) {
if (m_init && m_init->is_variable_declaration() && static_cast<const VariableDeclaration*>(m_init.ptr())->declaration_type() != DeclarationType::Var) {
wrapper = create_ast_node<BlockStatement>();
interpreter.enter_scope(*wrapper, {}, ScopeType::Block);
}

2
Libraries/LibJS/Parser.cpp
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@ -612,7 +612,7 @@ NonnullRefPtr<ForStatement> Parser::parse_for_statement()
RefPtr<Expression> update;
switch (m_current_token.type()) {
case TokenType::Semicolon:
case TokenType::ParenClose:
break;
default:
update = parse_expression(0);

24
Libraries/LibJS/Tests/for-basic.js Normal file
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@ -0,0 +1,24 @@
function assert(x) { if (!x) throw 1; }
try {
var a = [];
for (var i = 0; i < 3; ++i) {
a.push(i);
}
assert(a.length === 3);
assert(a[0] === 0);
assert(a[1] === 1);
assert(a[2] === 2);
for (; a.length < 6;) {
a.push('x');
}
assert(a.length === 6);
assert(a[3] === 'x');
assert(a[4] === 'x');
assert(a[5] === 'x');
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}