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LibJS: Distinguish between statement and declaration

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This separates matching/parsing of statements and declarations and
fixes a few edge cases where the parser would incorrectly accept a
declaration where only a statement is allowed - for example:

    if (foo) const a = 1;
    for (var bar;;) function b() {}
    while (baz) class c {}
This commit is contained in:
Linus Groh
2020-10-22 23:30:07 +01:00
committed by Andreas Kling
parent f8ae6fa713
commit 80bb62b9cc
4 changed files with 73 additions and 30 deletions
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2
Libraries/LibJS/Parser.h
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@@ -60,6 +60,7 @@ public:
NonnullRefPtr<FunctionNodeType> parse_function_node(u8 parse_options = FunctionNodeParseOptions::CheckForFunctionAndName);
Vector<FunctionNode::Parameter> parse_function_parameters(int& function_length, u8 parse_options = 0);
NonnullRefPtr<Declaration> parse_declaration();
NonnullRefPtr<Statement> parse_statement();
NonnullRefPtr<BlockStatement> parse_block_statement();
NonnullRefPtr<BlockStatement> parse_block_statement(bool& is_strict);
@@ -147,6 +148,7 @@ private:
bool match_unary_prefixed_expression() const;
bool match_secondary_expression(Vector<TokenType> forbidden = {}) const;
bool match_statement() const;
bool match_declaration() const;
bool match_variable_declaration() const;
bool match_identifier_name() const;
bool match_property_key() const;