radiance · commit

lang: Parse array elements in normal context

8bbc22f37c716cccdc90b8b5a73e3526ac60703c5b69ec67dc4202c2c1de7892

Array elements inherited the enclosing condition context, where
an opening brace terminates the condition. Record literals inside
bracketed arrays were consequently rejected as condition bodies.

Parse the contents of an array literal in normal expression context
and restore the enclosing context after its closing bracket.

Assisted-by: Codex:gpt-5.6-sol

Alexis Sellier committed 1 month ago 1 parent 0268ebd6

lib/std/lang/parser.rad +5 -0

/// Parse an array literal: `[a, b, c]` or `[item; count]`.
fn parseArrayLiteral(p: *mut Parser) -> *ast::Node
    throws (ParseError)
{
    try expect(p, scanner::TokenKind::LBracket, "expected `[`");
    let saved = p.context;
    set p.context = Context::Normal;
    if consume(p, scanner::TokenKind::RBracket) { // Empty array: `[]`.
        let empty: *mut [*ast::Node] = &mut [];
        set p.context = saved;
        return node(p, ast::NodeValue::ArrayLit(empty));
    }
    let firstExpr = try parseExpr(p);

    if consume(p, scanner::TokenKind::Semicolon) {
        // Array repeat literal: `[item; count]`.
        let count = try parseExpr(p);
        try expect(p, scanner::TokenKind::RBracket, "expected `]` after array repeat count");
        set p.context = saved;

        return node(p, ast::NodeValue::ArrayRepeatLit(
            ast::ArrayRepeatLit { item: firstExpr, count }
        ));
    }

    while consume(p, scanner::TokenKind::Comma) and not check(p, scanner::TokenKind::RBracket) {
        let elem = try parseExpr(p);
        items.append(elem, p.allocator);
    }
    try expect(p, scanner::TokenKind::RBracket, "expected `]` after array elements");
    set p.context = saved;

    return node(p, ast::NodeValue::ArrayLit(items));
}

/// Parse a function call expression.

test/tests/parser.condition.array.record.rad added +11 -0

1	+	//! returns: 0
2	+	//! Bracketed array elements may contain record literals in a condition.
3	+
4	+	record Box { value: i32 }
5	+
6	+	@default fn main() -> i32 {
7	+	if [Box { value: 1 }][0].value == 1 {
8	+	return 0;
9	+	}
10	+	return 1;
11	+	}

241	241		/// Parse an array literal: `[a, b, c]` or `[item; count]`.
242	242		fn parseArrayLiteral(p: mut Parser) -> ast::Node
243	243		throws (ParseError)
244	244		{
245	245		try expect(p, scanner::TokenKind::LBracket, "expected `[`");
	246	+	let saved = p.context;
	247	+	set p.context = Context::Normal;
246	248		if consume(p, scanner::TokenKind::RBracket) { // Empty array: `[]`.
247	249		let empty: mut [ast::Node] = &mut [];
	250	+	set p.context = saved;
248	251		return node(p, ast::NodeValue::ArrayLit(empty));
249	252		}
250	253		let firstExpr = try parseExpr(p);
251	254
252	255		if consume(p, scanner::TokenKind::Semicolon) {
253	256		// Array repeat literal: `[item; count]`.
254	257		let count = try parseExpr(p);
255	258		try expect(p, scanner::TokenKind::RBracket, "expected `]` after array repeat count");
	259	+	set p.context = saved;
256	260
257	261		return node(p, ast::NodeValue::ArrayRepeatLit(
258	262		ast::ArrayRepeatLit { item: firstExpr, count }
259	263		));
260	264		}

264	268		while consume(p, scanner::TokenKind::Comma) and not check(p, scanner::TokenKind::RBracket) {
265	269		let elem = try parseExpr(p);
266	270		items.append(elem, p.allocator);
267	271		}
268	272		try expect(p, scanner::TokenKind::RBracket, "expected `]` after array elements");
	273	+	set p.context = saved;
269	274
270	275		return node(p, ast::NodeValue::ArrayLit(items));
271	276		}
272	277
273	278		/// Parse a function call expression.