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LibJS: Implement ConditionalExpression (ternary "?:" operator)

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This commit is contained in:
Andreas Kling 2020-04-03 12:14:28 +02:00
parent 522d8c5d71
commit 0622181d1f
5 changed files with 83 additions and 1 deletions
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14
Libraries/LibJS/Parser.cpp
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@ -516,6 +516,8 @@ NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expre
case TokenType::DoublePipe:
consume();
return create_ast_node<LogicalExpression>(LogicalOp::Or, move(lhs), parse_expression(min_precedence, associativity));
case TokenType::QuestionMark:
return parse_conditional_expression(move(lhs));
default:
m_parser_state.m_has_errors = true;
expected("secondary expression (missing switch case)");
@ -660,6 +662,15 @@ NonnullRefPtr<BreakStatement> Parser::parse_break_statement()
return create_ast_node<BreakStatement>();
}
NonnullRefPtr<ConditionalExpression> Parser::parse_conditional_expression(NonnullRefPtr<Expression> test)
{
consume(TokenType::QuestionMark);
auto consequent = parse_expression(0);
consume(TokenType::Colon);
auto alternate = parse_expression(0);
return create_ast_node<ConditionalExpression>(move(test), move(consequent), move(alternate));
}
NonnullRefPtr<TryStatement> Parser::parse_try_statement()
{
consume(TokenType::Try);
@ -865,7 +876,8 @@ bool Parser::match_secondary_expression() const
|| type == TokenType::BracketOpen
|| type == TokenType::PlusPlus
|| type == TokenType::MinusMinus
|| type == TokenType::Instanceof;
|| type == TokenType::Instanceof
|| type == TokenType::QuestionMark;
}
bool Parser::match_statement() const