Local equations

abstract production id
lhs::Expr ::= n::String
  local refs :: [Decorated Dcl] =
    lookupName(n, lhs.env);


The preferred form of local declarations is shown above, as one production statement.

Production attributes (local visible to all aspects, not just the current production body) can be declared in the same way, except using production instead of local.

Legacy syntax

The old form of local declaration is two-part. First, the local is declared:

local attribute <name> :: <type>;

The name of the attribute and its type (following the has-type symbol ::) is similar to the name/type specifications in production signatures. This attribute can be referenced inside the production body. The separate definition of its value has the form

<name> = <expression>;

Higher-order attributes

If the local attribute is a higher order attribute (its type is a nonterminal), then inherited attributes can be set on it just like they are set for the nonterminal children on the right-hand side of the production.

  local chain :: IOChain = print("hello, world");
  chain.inputIOToken = ioin;

Collection attributes

Currently, production attributes can be collections, but the legacy syntax must be used.

  production attribute contribs :: [Stmt] with ++;
  contribs := [];