MissingH-1.1.0.1: Large utility librarySource codeContentsIndex
Data.Map.Utils
Portabilityportable
Stabilityprovisional
MaintainerJohn Goerzen <jgoerzen@complete.org>
Contents
Basic Utilities
Conversions
Description

This module provides various helpful utilities for dealing with Data.Maps.

Written by John Goerzen, jgoerzen@complete.org

Synopsis
flipM :: (Ord key, Ord val) => Map key val -> Map val [key]
flippedLookupM :: (Ord val, Ord key) => val -> Map key val -> [key]
forceLookupM :: (Show key, Ord key) => String -> key -> Map key elt -> elt
strToM :: (Read a, Read b, Ord a) => String -> Map a b
strFromM :: (Show a, Show b, Ord a) => Map a b -> String
Basic Utilities
flipM :: (Ord key, Ord val) => Map key val -> Map val [key]Source
Flips a Map. See flipAL for more on the similar function for lists.
flippedLookupM :: (Ord val, Ord key) => val -> Map key val -> [key]Source
Returns a list of all keys in the Map whose value matches the parameter. If the value does not occur in the Map, the empty list is returned.
forceLookupM :: (Show key, Ord key) => String -> key -> Map key elt -> eltSource
Performs a lookup, and raises an exception (with an error message prepended with the given string) if the key could not be found.
Conversions
strToM :: (Read a, Read b, Ord a) => String -> Map a bSource

Converts a String into a String, String Map. See strToAL for more on the similar function for association lists.

This implementation is simple: 

strToM = Data.Map.fromList . strToAL

This function is designed to work with Map String String objects, but may work with other key/value combinations if they have simple representations.

strFromM :: (Show a, Show b, Ord a) => Map a b -> StringSource

Converts a String, String Map into a string representation. See strFromAL for more on the similar function for association lists. This implementation is simple: 

strFromM = strFromAL . Data.Map.toList

This function is designed to work with Map String String objects, but may also work with other objects with simple representations.

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