Struct QueryDesugarTransform 

pub struct QueryDesugarTransform;

Rewrites -> query/dispatch sugar into explicit query()/query_all() calls.

The parser produces BinOp(Query, lhs, rhs) for all -> expressions without interpreting selector/query semantics. This pass rewrites query/dispatch forms before the evaluator runs, leaving only plain expr |> fn_value pipes for eval.

Rewrite rules (implemented)

"selector" -> handler
    →  query("selector", handler)        // if selector matches #id pattern
    →  query_all("selector", handler)    // otherwise

Deferred (pending Query HostCall + small extra rewrite rules)

"selector" -> method(args)
    →  query("selector", fn(r) { r.method(args) })

scope -> "selector" -> handler
    →  scope.query("selector", handler)

These do not need a dedicated Expression::MethodCall AST node — methods are already represented as CallExpression with callee = BinOp(Dot, ..). They need: (1) a Query HostCall on the host, (2) detection of Call-shaped rhs in the existing BinOp(Query, ..) rewrite. See docs/meow_meow/task/query-engine-and-mms-query-host-calls.md.

Selector heuristic: starts with # and contains no spaces or combinators → single (query); otherwise → multiple (query_all). Callers can override with the explicit query()/query_all() function forms.

Implementations

impl QueryDesugarTransform

pub fn apply(stmts: &mut Vec<Statement>)