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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.List.Lens</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (C) 2012-14 Edward Kmett</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Traversals for manipulating parts of a list.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-16"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>prefixed</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>suffixed</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripSuffix</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Deprecated</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>strippingPrefix</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>strippingSuffix</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>guard</span><span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-comment'>-- $setup</span>
<a name="line-30"></a><span class='hs-comment'>-- >>> :set -XNoOverloadedStrings</span>
<a name="line-31"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Expr</span>
<a name="line-32"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Vars as Vars hiding (f,g)</span>
<a name="line-33"></a><span class='hs-comment'>-- >>> let f :: Expr -> Expr; f = Debug.SimpleReflect.Vars.f</span>
<a name="line-34"></a><span class='hs-comment'>-- >>> let g :: Expr -> Expr; g = Debug.SimpleReflect.Vars.g</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="prefixed"></a><span class='hs-comment'>-- | A 'Prism' stripping a prefix from a list when used as a 'Traversal', or</span>
<a name="line-37"></a><span class='hs-comment'>-- prepending that prefix when run backwards:</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- >>> "preview" ^? prefixed "pre"</span>
<a name="line-40"></a><span class='hs-comment'>-- Just "view"</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- >>> "review" ^? prefixed "pre"</span>
<a name="line-43"></a><span class='hs-comment'>-- Nothing</span>
<a name="line-44"></a><span class='hs-comment'>--</span>
<a name="line-45"></a><span class='hs-comment'>-- >>> prefixed "pre" # "amble"</span>
<a name="line-46"></a><span class='hs-comment'>-- "preamble"</span>
<a name="line-47"></a><span class='hs-definition'>prefixed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Prism'</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-48"></a><span class='hs-definition'>prefixed</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism'</span> <span class='hs-layout'>(</span><span class='hs-varid'>ps</span> <span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stripPrefix</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-comment'>{-# INLINE prefixed #-}</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="suffixed"></a><span class='hs-comment'>-- | A 'Prism' stripping a suffix from a list when used as a 'Traversal', or</span>
<a name="line-52"></a><span class='hs-comment'>-- appending that suffix when run backwards:</span>
<a name="line-53"></a><span class='hs-comment'>--</span>
<a name="line-54"></a><span class='hs-comment'>-- >>> "review" ^? suffixed "view"</span>
<a name="line-55"></a><span class='hs-comment'>-- Just "re"</span>
<a name="line-56"></a><span class='hs-comment'>--</span>
<a name="line-57"></a><span class='hs-comment'>-- >>> "review" ^? suffixed "tire"</span>
<a name="line-58"></a><span class='hs-comment'>-- Nothing</span>
<a name="line-59"></a><span class='hs-comment'>--</span>
<a name="line-60"></a><span class='hs-comment'>-- >>> suffixed ".o" # "hello"</span>
<a name="line-61"></a><span class='hs-comment'>-- "hello.o"</span>
<a name="line-62"></a><span class='hs-definition'>suffixed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Prism'</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-63"></a><span class='hs-definition'>suffixed</span> <span class='hs-varid'>qs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism'</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span> <span class='hs-varid'>qs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stripSuffix</span> <span class='hs-varid'>qs</span><span class='hs-layout'>)</span>
<a name="line-64"></a><span class='hs-comment'>{-# INLINE suffixed #-}</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-67"></a><span class='hs-comment'>-- Util</span>
<a name="line-68"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="stripSuffix"></a><span class='hs-definition'>stripSuffix</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-71"></a><span class='hs-definition'>stripSuffix</span> <span class='hs-varid'>qs</span> <span class='hs-varid'>xs0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>xs0</span> <span class='hs-varid'>zs</span>
<a name="line-72"></a> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-varid'>zs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>drp</span> <span class='hs-varid'>qs</span> <span class='hs-varid'>xs0</span>
<a name="line-74"></a> <span class='hs-varid'>drp</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>drp</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>xs</span>
<a name="line-75"></a> <span class='hs-varid'>drp</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xs</span>
<a name="line-76"></a> <span class='hs-varid'>drp</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-77"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-78"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>xs</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zipWith</span> <span class='hs-varid'>const</span> <span class='hs-varid'>xs0</span> <span class='hs-varid'>zs</span> <span class='hs-varop'><$</span> <span class='hs-varid'>guard</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span> <span class='hs-varop'>==</span> <span class='hs-varid'>qs</span><span class='hs-layout'>)</span>
<a name="line-79"></a> <span class='hs-varid'>go</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <span class='hs-comment'>-- impossible</span>
<a name="line-80"></a><span class='hs-comment'>{-# INLINE stripSuffix #-}</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="strippingPrefix"></a><span class='hs-comment'>-- | This is a deprecated alias for 'prefixed'.</span>
<a name="line-83"></a><span class='hs-definition'>strippingPrefix</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Prism'</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-84"></a><span class='hs-definition'>strippingPrefix</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prefixed</span>
<a name="line-85"></a><span class='hs-comment'>{-# INLINE strippingPrefix #-}</span>
<a name="line-86"></a><span class='hs-comment'>{-# DEPRECATED strippingPrefix "Use 'prefixed'." #-}</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="strippingSuffix"></a><span class='hs-comment'>-- | This is a deprecated alias for 'suffixed'.</span>
<a name="line-89"></a><span class='hs-definition'>strippingSuffix</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Prism'</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-90"></a><span class='hs-definition'>strippingSuffix</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>suffixed</span>
<a name="line-91"></a><span class='hs-comment'>{-# INLINE strippingSuffix #-}</span>
<a name="line-92"></a><span class='hs-comment'>{-# DEPRECATED strippingSuffix "Use 'suffixed'." #-}</span>
<a name="line-93"></a>
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