| regex-base-0.72.0.1: Replaces/Enhances Text.Regex | Source code | Contents | Index

Text.Regex.Base.RegexLike

Portability | non-portable (MPTC+FD)
Stability | experimental
Maintainer | libraries@haskell.org, textregexlazy@personal.mightyreason.com

Contents

Type aliases
Data types
Classes

Description

Classes and instances for Regex matching.

All the classes are declared here, and some common type aliases, and the MatchResult data type.

The only instances here are for Extract String and Extract ByteString. There are no data values. The `RegexContext` instances are in Text.Regex.Base.Context, except for ones which run afoul of a repeated variable (RegexContext regex a a), which are defined in each modules' String and ByteString modules.

Synopsis

type MatchOffset = Int
type MatchLength = Int
type MatchArray = Array Int (MatchOffset, MatchLength)
type MatchText source = Array Int (source, (MatchOffset, MatchLength))

data MatchResult a = MR {

mrBefore :: a
mrMatch :: a
mrAfter :: a
mrSubList :: [a]
mrSubs :: (Array Int a)

}

class RegexOptions regex compOpt execOpt | regex -> compOpt execOpt, compOpt -> regex execOpt, execOpt -> regex compOpt where

blankCompOpt :: compOpt
blankExecOpt :: execOpt
defaultCompOpt :: compOpt
defaultExecOpt :: execOpt
setExecOpts :: execOpt -> regex -> regex
getExecOpts :: regex -> execOpt

class RegexOptions regex compOpt execOpt => RegexMaker regex compOpt execOpt source | regex -> compOpt execOpt, compOpt -> regex execOpt, execOpt -> regex compOpt where

makeRegex :: source -> regex
makeRegexOpts :: compOpt -> execOpt -> source -> regex

class Extract source => RegexLike regex source where

matchAll :: regex -> source -> [MatchArray]
matchOnce :: regex -> source -> Maybe MatchArray
matchCount :: regex -> source -> Int
matchTest :: regex -> source -> Bool
matchAllText :: regex -> source -> [MatchText source]
matchOnceText :: regex -> source -> Maybe (source, MatchText source, source)

class RegexLike regex source => RegexContext regex source target where

match :: regex -> source -> target
matchM :: Monad m => regex -> source -> m target

class Extract source where

before :: Int -> source -> source
after :: Int -> source -> source
empty :: source
extract :: (Int, Int) -> source -> source

Type aliases

type MatchOffset = Int | Source

0 based index from start of source, or (-1) for unused

type MatchLength = Int | Source

non-negative length of a match

type MatchArray = Array Int (MatchOffset, MatchLength) | Source

0 based array, with 0th index indicating the full match. If the full match location is not available, represent as (0,0).

type MatchText source = Array Int (source, (MatchOffset, MatchLength)) | Source

Data types

data MatchResult a | Source

This is the same as the type from JRegex.
Constructors

MR |

mrBefore :: a |
mrMatch :: a |
mrAfter :: a |
mrSubList :: [a] |
mrSubs :: (Array Int a) |

Instances

RegexLike a b => RegexContext a b (MatchResult b)

Classes

class RegexOptions regex compOpt execOpt | regex -> compOpt execOpt, compOpt -> regex execOpt, execOpt -> regex compOpt where | Source

Rather than carry them around spearately, the options for how to execute a regex are kept as part of the regex. There are two types of options. Those that can only be specified at compilation time and never changed are CompOpt. Those that can be changed later and affect how matching is performed are ExecOpt. The actually types for these depend on the backend.
Methods

blankCompOpt | Source

:: compOpt | no options set at all in the backend

blankExecOpt | Source

:: execOpt | no options set at all in the backend

defaultCompOpt | Source

:: compOpt | reasonable options (extended,caseSensitive,multiline regex)

defaultExecOpt | Source

:: execOpt | reasonable options (extended,caseSensitive,multiline regex)

setExecOpts :: execOpt -> regex -> regex | Source

forget old flags and use new ones

getExecOpts :: regex -> execOpt | Source

retrieve the current flags

class RegexOptions regex compOpt execOpt => RegexMaker regex compOpt execOpt source | regex -> compOpt execOpt, compOpt -> regex execOpt, execOpt -> regex compOpt where | Source

RegexMaker captures the creation of the compiled regular expression from a source type and an option type. The `makeRegex` function has a default implementation that depends on makeRegexOpts and used `defaultCompOpt` and `defaultExecOpt`.
Methods

makeRegex :: source -> regex | Source

make using the defaultCompOpt and defaultExecOpt

makeRegexOpts :: compOpt -> execOpt -> source -> regex | Source

Specify your own options

class Extract source => RegexLike regex source where | Source

RegexLike is parametrized on a regular expression type and a source type to run the matching on. There are default implementations: matchTest and matchOnceText using matchOnce; matchCount and matchAllText using matchAll. matchOnce uses matchOnceText and matchAll uses matchAllText. So a minimal complete instance need to provide (matchOnce or matchOnceText) and (matchAll or matchAllText).
Methods

matchAll :: regex -> source -> [MatchArray] | Source

matchOnce :: regex -> source -> Maybe MatchArray | Source

This can return an array of (offset,length) index pairs for the match and captured substrings.

matchCount :: regex -> source -> Int | Source

matchTest :: regex -> source -> Bool | Source

matchAllText :: regex -> source -> [MatchText source] | Source

matchOnceText :: regex -> source -> Maybe (source, MatchText source, source) | Source

This can return a tuple of three items: the source before the match, an array of the match and captured substrings (with their indices), and the source after the match.

class RegexLike regex source => RegexContext regex source target where | Source

RegexContext is the polymorphic interface to do matching
Methods

match :: regex -> source -> target | Source

matchM :: Monad m => regex -> source -> m target | Source

Instances

RegexLike a b => RegexContext a b Bool
RegexLike a b => RegexContext a b Int
RegexLike a b => RegexContext a b MatchArray
RegexLike a b => RegexContext a b ()
RegexLike a b => RegexContext a b (MatchOffset, MatchLength)
RegexLike a b => RegexContext a b (b, MatchText b, b)
RegexLike a b => RegexContext a b (b, b, b)
RegexLike a b => RegexContext a b (b, b, b, [b])
RegexLike a b => RegexContext a b (MatchResult b)
RegexLike a b => RegexContext a b [Array Int b]
RegexLike a b => RegexContext a b [MatchArray]
RegexLike a b => RegexContext a b [MatchText b]
RegexLike a b => RegexContext a b [(MatchOffset, MatchLength)]
RegexLike a b => RegexContext a b [[b]]
RegexLike a b => RegexContext a b [b]
RegexLike a b => RegexContext a b (Array Int b)

class Extract source where | Source

Extract allows for indexing operations on String or ByteString.
Methods

before :: Int -> source -> source | Source

before is a renamed take

after :: Int -> source -> source | Source

after is a renamed drop

empty :: source | Source

For when there is no match, this can construct an empty data value

extract :: (Int, Int) -> source -> source | Source

extract takes an offset and length and has a default implementation of `extract (off,len) source = before len (after off source)`

Instances

Extract ByteString
Extract String

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