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LibJS: Implement rest parameters

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This commit is contained in:
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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27
Libraries/LibJS/Parser.cpp
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@ -282,8 +282,13 @@ RefPtr<FunctionExpression> Parser::try_parse_arrow_function_expression(bool expe
Vector<FunctionNode::Parameter> parameters;
bool parse_failed = false;
bool has_rest_parameter = false;
while (true) {
if (match(TokenType::Comma)) {
if (has_rest_parameter) {
parse_failed = true;
break;
}
consume(TokenType::Comma);
} else if (match(TokenType::Identifier)) {
auto parameter_name = consume(TokenType::Identifier).value();
@ -293,6 +298,15 @@ RefPtr<FunctionExpression> Parser::try_parse_arrow_function_expression(bool expe
default_value = parse_expression(0);
}
parameters.append({ parameter_name, default_value });
} else if (match(TokenType::TripleDot)) {
consume();
if (has_rest_parameter) {
parse_failed = true;
break;
}
has_rest_parameter = true;
auto parameter_name = consume(TokenType::Identifier).value();
parameters.append({ parameter_name, nullptr, true });
} else if (match(TokenType::ParenClose)) {
if (expect_parens) {
consume(TokenType::ParenClose);
@ -359,7 +373,7 @@ NonnullRefPtr<Expression> Parser::parse_primary_expression()
switch (m_parser_state.m_current_token.type()) {
case TokenType::ParenOpen: {
consume(TokenType::ParenOpen);
if (match(TokenType::ParenClose) || match(TokenType::Identifier)) {
if (match(TokenType::ParenClose) || match(TokenType::Identifier) || match(TokenType::TripleDot)) {
auto arrow_function_result = try_parse_arrow_function_expression(true);
if (!arrow_function_result.is_null()) {
return arrow_function_result.release_nonnull();
@ -818,7 +832,13 @@ NonnullRefPtr<FunctionNodeType> Parser::parse_function_node(bool needs_function_
}
consume(TokenType::ParenOpen);
Vector<FunctionNode::Parameter> parameters;
while (match(TokenType::Identifier)) {
while (match(TokenType::Identifier) || match(TokenType::TripleDot)) {
if (match(TokenType::TripleDot)) {
consume();
auto parameter_name = consume(TokenType::Identifier).value();
parameters.append({ parameter_name, nullptr, true });
break;
}
auto parameter_name = consume(TokenType::Identifier).value();
RefPtr<Expression> default_value;
if (match(TokenType::Equals)) {
@ -826,9 +846,8 @@ NonnullRefPtr<FunctionNodeType> Parser::parse_function_node(bool needs_function_
default_value = parse_expression(0);
}
parameters.append({ parameter_name, default_value });
if (match(TokenType::ParenClose)) {
if (match(TokenType::ParenClose))
break;
}
consume(TokenType::Comma);
}
consume(TokenType::ParenClose);