capture_expr - syntax

func capture_expr(source_id: Int, source: String, input: TokenRange, context: &SyntaxContext) -> SyntaxResult<Expr>

Validates input as exactly one expression and captures its canonical tokens.

Every identifier receives the supplied use-site context and original source provenance. No source text is re-lexed because input already owns tokens.

View Source

pub func capture_expr(source_id: Int, source: String, input: TokenRange, context: &SyntaxContext) -> SyntaxResult<Expr> {
	let outcome = parse_expr_tokens(source: source, input: input)
	if let .some(failure) = parse_failure(outcome: outcome, fallback: input.span) {
		return SyntaxResult<Expr>(value: .none, failure: .some(failure))
	}
	let raw = raw_from_range(source_id: source_id, source: source, input: input, category: .expr, context: context, origin: .use_site)
	SyntaxResult<Expr>(value: .some(Syntax<Expr>(raw: raw)), failure: .none)
}