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LibJS: Implement for statement

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This commit is contained in:
Conrad Pankoff 2020-03-12 23:12:12 +11:00 • committed by Andreas Kling
parent e88f2f15ee
commit 097e1af4e8
6 changed files with 119 additions and 0 deletions
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50
Libraries/LibJS/Parser.cpp
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@ -66,6 +66,8 @@ NonnullOwnPtr<Statement> Parser::parse_statement()
return parse_return_statement();
case TokenType::Var:
return parse_variable_declaration();
case TokenType::For:
return parse_for_statement();
default:
m_has_errors = true;
expected("statement (missing switch case)");
@ -251,6 +253,53 @@ NonnullOwnPtr<VariableDeclaration> Parser::parse_variable_declaration()
return make<VariableDeclaration>(make<Identifier>(name), move(initializer), DeclarationType::Var);
}
NonnullOwnPtr<ForStatement> Parser::parse_for_statement()
{
consume(TokenType::For);
consume(TokenType::ParenOpen);
OwnPtr<Statement> init = nullptr;
switch (m_current_token.type()) {
case TokenType::Var:
init = parse_variable_declaration();
break;
case TokenType::Semicolon:
break;
default:
init = parse_statement();
break;
}
consume(TokenType::Semicolon);
OwnPtr<Expression> test = nullptr;
switch (m_current_token.type()) {
case TokenType::Semicolon:
break;
default:
test = parse_expression();
break;
}
consume(TokenType::Semicolon);
OwnPtr<Expression> update = nullptr;
switch (m_current_token.type()) {
case TokenType::Semicolon:
break;
default:
update = parse_expression();
break;
}
consume(TokenType::ParenClose);
auto body = parse_block_statement();
return make<ForStatement>(move(init), move(test), move(update), move(body));
}
bool Parser::match(TokenType type) const
{
return m_current_token.type() == type;
@ -306,6 +355,7 @@ bool Parser::match_statement() const
|| type == TokenType::If
|| type == TokenType::Try
|| type == TokenType::While
|| type == TokenType::For
|| type == TokenType::Const
|| type == TokenType::CurlyOpen
|| type == TokenType::Var;