idris-0.11.1: Functional Programming Language with Dependent Types

Safe HaskellNone



The coverage and totality checkers for Idris are in this module.



mkPatTm :: PTerm -> Idris Term Source

Generate a pattern from an impossible LHS.

We need this to eliminate the pattern clauses which have been provided explicitly from new clause generation.

genClauses :: FC -> Name -> [Term] -> [PTerm] -> Idris [PTerm] Source

Given a list of LHSs, generate a extra clauses which cover the remaining cases. The ones which haven't been provided are marked absurd so that the checker will make sure they can't happen.

This will only work after the given clauses have been typechecked and the names are fully explicit!

validCoverageCase :: Context -> Err -> Bool Source

Does this error result rule out a case as valid when coverage checking?

recoverableCoverage :: Context -> Err -> Bool Source

Check whether an error is recoverable in the sense needed for coverage checking.

upd :: t -> PArg' t -> PArg' t Source

checkPositive Source


:: [Name]

the group of type declarations

-> (Name, Type)

the constructor

-> Idris Totality 

Check if, in a given group of type declarations mut_ns, the constructor cn : ty is strictly positive, and update the context accordingly

calcTotality :: FC -> Name -> [([Name], Term, Term)] -> Idris Totality Source

Calculate the totality of a function from its patterns. Either follow the size change graph (if inductive) or check for productivity (if coinductive)

buildSCG :: (FC, Name) -> Idris () Source

Calculate the size change graph for this definition

SCG for a function f consists of a list of: (g, [(a1, sizechange1), (a2, sizechange2), ..., (an, sizechangen)])

where g is a function called a1 ... an are the arguments of f in positions 1..n of g sizechange1 ... sizechange2 is how their size has changed wrt the input to f Nothing, if the argument is unrelated to the input

buildSCG' :: IState -> Name -> [(Term, Term)] -> [Name] -> [SCGEntry] Source

collapseNothing :: [(Maybe a, b)] -> [(Maybe a, b)] Source