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LibJS: Correctly parse yield-from expressions

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This commit implements parsing for `yield *expr`, and the multiple
ways something can or can't be parsed like that.
Also makes yield-from a TODO in the bytecode generator.
Behold, the glory of javascript syntax:
```js
// 'yield' = expression in generators.
function* foo() {
    yield
    *bar; // <- Syntax error here, expression can't start with *
}

// 'yield' = identifier anywhere else.
function foo() {
    yield
    *bar; // Perfectly fine, this is just `yield * bar`
}
```
This commit is contained in:
Ali Mohammad Pur 2021-06-14 15:46:41 +04:30 • committed by Linus Groh
parent d374295a26
commit 3194177dce
5 changed files with 67 additions and 42 deletions
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7
Userland/Libraries/LibJS/Parser.h
View file

@ -44,6 +44,11 @@ public:
Vector<FunctionNode::Parameter> parse_formal_parameters(int& function_length, u8 parse_options = 0);
RefPtr<BindingPattern> parse_binding_pattern();
struct PrimaryExpressionParseResult {
NonnullRefPtr<Expression> result;
bool should_continue_parsing_as_expression { true };
};
NonnullRefPtr<Declaration> parse_declaration();
NonnullRefPtr<Statement> parse_statement();
NonnullRefPtr<BlockStatement> parse_block_statement();
@ -66,7 +71,7 @@ public:
NonnullRefPtr<DebuggerStatement> parse_debugger_statement();
NonnullRefPtr<ConditionalExpression> parse_conditional_expression(NonnullRefPtr<Expression> test);
NonnullRefPtr<Expression> parse_expression(int min_precedence, Associativity associate = Associativity::Right, const Vector<TokenType>& forbidden = {});
NonnullRefPtr<Expression> parse_primary_expression();
PrimaryExpressionParseResult parse_primary_expression();
NonnullRefPtr<Expression> parse_unary_prefixed_expression();
NonnullRefPtr<RegExpLiteral> parse_regexp_literal();
NonnullRefPtr<ObjectExpression> parse_object_expression();