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LibJS: Implement 'new.target'

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This adds a new MetaProperty AST node which will be used for
'new.target' and 'import.meta' meta properties. The parser now
distinguishes between "in function context" and "in arrow function
context" (which is required for this).
When encountering TokenType::New we will attempt to parse it as meta
property and resort to regular new expression parsing if that fails,
much like the parsing of labelled statements.
This commit is contained in:
Linus Groh 2020-11-02 21:27:42 +00:00 • committed by Andreas Kling
parent e07a39c816
commit 39a1c9d827
6 changed files with 109 additions and 10 deletions
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8
Libraries/LibJS/Parser.h
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@ -81,7 +81,6 @@ public:
NonnullRefPtr<WhileStatement> parse_while_statement();
NonnullRefPtr<DebuggerStatement> parse_debugger_statement();
NonnullRefPtr<ConditionalExpression> parse_conditional_expression(NonnullRefPtr<Expression> test);
NonnullRefPtr<Expression> parse_expression(int min_precedence, Associativity associate = Associativity::Right, Vector<TokenType> forbidden = {});
NonnullRefPtr<Expression> parse_primary_expression();
NonnullRefPtr<Expression> parse_unary_prefixed_expression();
@ -93,13 +92,15 @@ public:
NonnullRefPtr<Expression> parse_secondary_expression(NonnullRefPtr<Expression>, int min_precedence, Associativity associate = Associativity::Right);
NonnullRefPtr<CallExpression> parse_call_expression(NonnullRefPtr<Expression>);
NonnullRefPtr<NewExpression> parse_new_expression();
RefPtr<FunctionExpression> try_parse_arrow_function_expression(bool expect_parens);
RefPtr<Statement> try_parse_labelled_statement();
NonnullRefPtr<ClassDeclaration> parse_class_declaration();
NonnullRefPtr<ClassExpression> parse_class_expression(bool expect_class_name);
NonnullRefPtr<Expression> parse_property_key();
NonnullRefPtr<AssignmentExpression> parse_assignment_expression(AssignmentOp, NonnullRefPtr<Expression> lhs, int min_precedence, Associativity);
RefPtr<FunctionExpression> try_parse_arrow_function_expression(bool expect_parens);
RefPtr<Statement> try_parse_labelled_statement();
RefPtr<MetaProperty> try_parse_new_target_expression();
struct Position {
size_t line;
size_t column;
@ -181,6 +182,7 @@ private:
bool m_allow_super_property_lookup { false };
bool m_allow_super_constructor_call { false };
bool m_in_function_context { false };
bool m_in_arrow_function_context { false };
bool m_in_break_context { false };
bool m_in_continue_context { false };
bool m_string_legacy_octal_escape_sequence_in_scope { false };