Compute the weight of object object. weight is a complexity measure used to compare mathematical objects. Weight is a memoized function: it remembers its results between calls.

Return t if tree rooted here is balanced, i.e., all the children have the same weight.

Define the special patterns that should be looked for when processing object. Methods on this function for specific object types specify such patterns in the form of a case statement, with one case for each pattern to be identified. Rendering rules that should be applied when special patterns are seen, can be defined. Example: If we specify ’half as the special pattern for , then we can define a rendering rule named ’half for object math-object. Activating style use-special-patterns and executing turn-on-special-pattern with argument math-object results in the newly defined rule being used when rendering expressions containing . This function is memoized: it remembers its results between computations.

Render object object in audio. An around method on this function for the principal object type, document, calls the currently active rule for object. Primary methods on read-aloud for object serve as default rendering rules. Rendering rules should use read-aloud, rather than a specific rule, to render sub-objects —unless a specific rendering is to be hard-wired into the rule.

Return names of currently active rendering styles.

Activate style style.

Deactivate style style.

Activate rule rule-name for object object-name.

Deactivate currently active rule for object object-name.

Methods on this generic function define named rendering rules. object-name is the name of a document object type. rule-name is a symbol that names the rule. Rendering rules are methods on this generic function that specialize on both object type and rule name. Users of AS TE R should use the interface provided by Lisp macro def-reading-rule when defining new rules.

This macro provides a transparent interface to the underlying implementation of rendering rules. object-name names the object type, rule-name is the name of the rendering rule, and body is the body of the rendering rule. This macro expands to the appropriate method on generic function reading-rule.

Remove rendering rule rule-name for object object-name. This macro provides an easy-to-use interface to the CLOS function remove-method.

Trace rendering rule rule-name for object object-name. This macro provides an easy-to-use interface to the CLOS function remove-method.

Return documentation for rendering rule named rule-name for object type object-name.

Turn on special patterns for object type object-name. If special patterns are turned on, a known special pattern is seen and rendering style use-special-patterns is active then AS TE R uses a rule that is appropriate for this context.

Turn off special patterns for object object-name.