Agda- A dependently typed functional programming language and proof assistant

Safe HaskellNone



Tools for DisplayTerm and DisplayForm.



displayFormArities :: QName -> TCM [Int] Source

Get the arities of all display forms for a name.

displayForm :: QName -> Args -> TCM (Maybe DisplayTerm) Source

Find a matching display form for q vs. In essence this tries to reqwrite q vs with any display form q ps --> dt and returns the instantiated dt if successful. First match wins.

matchDisplayForm :: DisplayForm -> Args -> MaybeT TCM DisplayTerm Source

Match a DisplayForm q ps = v against q vs. Return the DisplayTerm v[us] if the match was successful, i.e., vs / ps = Just us.

class Match a where Source

Class Match for matching a term p in the role of a pattern against a term v.

The 0th variable in p plays the role of a place holder (pattern variable). Each occurrence of var 0 in p stands for a different pattern variable.

The result of matching, if successful, is a list of solutions for the pattern variables, in left-to-right order.

The 0th variable is in scope in the input v, but should not actually occur! In the output solution, the 0th variable is no longer in scope. (It has been substituted by IMPOSSIBLE which corresponds to a raise by -1).


match :: a -> a -> MaybeT TCM [Term] Source