Agda.TypeChecking.Coverage.SplitTree

Split tree for transforming pattern clauses into case trees.

The coverage checker generates a split tree from the clauses. The clause compiler uses it to transform clauses to case trees.

The initial problem is a set of clauses. The root node designates on which argument to split and has subtrees for all the constructors. Splitting continues until there is only a single clause left at each leaf of the split tree.

Documentation

type SplitTree = SplitTree' SplitTag

type SplitTrees = SplitTrees' SplitTag

data SplitTree' a

Abstract case tree shape.

Constructors

SplittingDone

No more splits coming. We are at a single, all-variable clause.

Fields

• splitBindings :: Int

  The number of variables bound in the clause

SplitAt

A split is necessary.

Fields

• splitArg :: Arg Int

  Arg. no to split at.

• splitTrees :: SplitTrees' a

  Sub split trees.

Instances

Pretty a => Pretty (SplitTree' a)

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

pretty :: SplitTree' a -> Doc

prettyPrec :: Int -> SplitTree' a -> Doc

prettyList :: [SplitTree' a] -> Doc

type SplitTrees' a = [(a, SplitTree' a)]

Split tree branching. A finite map from constructor names to splittrees A list representation seems appropriate, since we are expecting not so many constructors per data type, and there is no need for random access.

data SplitTag

Tag for labeling branches of a split tree. Each branch is associated to either a constructor or a literal, or is a catchall branch (currently only used for splitting on a literal type).

Constructors

SplitCon QName

SplitLit Literal

SplitCatchall

Instances

Eq SplitTag

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

(==) :: SplitTag -> SplitTag -> Bool

(/=) :: SplitTag -> SplitTag -> Bool

Ord SplitTag

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

compare :: SplitTag -> SplitTag -> Ordering

(<) :: SplitTag -> SplitTag -> Bool

(<=) :: SplitTag -> SplitTag -> Bool

(>) :: SplitTag -> SplitTag -> Bool

(>=) :: SplitTag -> SplitTag -> Bool

max :: SplitTag -> SplitTag -> SplitTag

min :: SplitTag -> SplitTag -> SplitTag

Show SplitTag

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

showsPrec :: Int -> SplitTag -> ShowS

show :: SplitTag -> String

showList :: [SplitTag] -> ShowS

Pretty SplitTag

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

pretty :: SplitTag -> Doc

prettyPrec :: Int -> SplitTag -> Doc

prettyList :: [SplitTag] -> Doc

PrettyTCM SplitTag

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

prettyTCM :: SplitTag -> TCM Doc

Printing a split tree

data SplitTreeLabel a

Constructors

SplitTreeLabel

Fields

• lblConstructorName :: Maybe a

  Nothing for root of split tree

• lblSplitArg :: Maybe (Arg Int)
• lblBindings :: Maybe Int

Instances

Pretty a => Pretty (SplitTreeLabel a)

Defined in Agda.TypeChecking.Coverage.SplitTree

Methods

pretty :: SplitTreeLabel a -> Doc

prettyPrec :: Int -> SplitTreeLabel a -> Doc

prettyList :: [SplitTreeLabel a] -> Doc

toTree :: SplitTree' a -> Tree (SplitTreeLabel a)

Convert a split tree into a Tree (for printing).

toTrees :: SplitTrees' a -> Forest (SplitTreeLabel a)