diff options
Diffstat (limited to 'Libraries')
| -rw-r--r-- | Libraries/LibJS/AST.cpp | 20 | ||||
| -rw-r--r-- | Libraries/LibJS/AST.h | 1 | ||||
| -rw-r--r-- | Libraries/LibJS/Parser.cpp | 6 |
3 files changed, 26 insertions, 1 deletions
diff --git a/Libraries/LibJS/AST.cpp b/Libraries/LibJS/AST.cpp index d1e9d53828..a815a6715a 100644 --- a/Libraries/LibJS/AST.cpp +++ b/Libraries/LibJS/AST.cpp @@ -199,6 +199,23 @@ Value UnaryExpression::execute(Interpreter& interpreter) const return bitwise_not(lhs_result); case UnaryOp::Not: return Value(!lhs_result.to_boolean()); + case UnaryOp::Typeof: + switch (lhs_result.type()) { + case Value::Type::Undefined: + return js_string(interpreter.heap(), "undefined"); + case Value::Type::Null: + // yes, this is on purpose. yes, this is how javascript works. + // yes, it's silly. + return js_string(interpreter.heap(), "object"); + case Value::Type::Number: + return js_string(interpreter.heap(), "number"); + case Value::Type::String: + return js_string(interpreter.heap(), "string"); + case Value::Type::Object: + return js_string(interpreter.heap(), "object"); + case Value::Type::Boolean: + return js_string(interpreter.heap(), "boolean"); + } } ASSERT_NOT_REACHED(); @@ -318,6 +335,9 @@ void UnaryExpression::dump(int indent) const case UnaryOp::Not: op_string = "!"; break; + case UnaryOp::Typeof: + op_string = "typeof "; + break; } print_indent(indent); diff --git a/Libraries/LibJS/AST.h b/Libraries/LibJS/AST.h index 2cf5ed32bd..b71ed57732 100644 --- a/Libraries/LibJS/AST.h +++ b/Libraries/LibJS/AST.h @@ -309,6 +309,7 @@ private: enum class UnaryOp { BitwiseNot, Not, + Typeof, }; class UnaryExpression : public Expression { diff --git a/Libraries/LibJS/Parser.cpp b/Libraries/LibJS/Parser.cpp index 754b251caa..dbc307ba4e 100644 --- a/Libraries/LibJS/Parser.cpp +++ b/Libraries/LibJS/Parser.cpp @@ -254,6 +254,9 @@ NonnullOwnPtr<Expression> Parser::parse_unary_prefixed_expression() case TokenType::Tilde: consume(); return make<UnaryExpression>(UnaryOp::BitwiseNot, parse_primary_expression()); + case TokenType::Typeof: + consume(); + return make<UnaryExpression>(UnaryOp::Typeof, parse_primary_expression()); default: m_has_errors = true; expected("primary expression (missing switch case)"); @@ -532,7 +535,8 @@ bool Parser::match_unary_prefixed_expression() const return type == TokenType::PlusPlus || type == TokenType::MinusMinus || type == TokenType::ExclamationMark - || type == TokenType::Tilde; + || type == TokenType::Tilde + || type == TokenType::Typeof; } bool Parser::match_secondary_expression() const |