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Sophie

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haskell-hxt-8.3.2-1mdv2010.1.x86_64.rpm

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>Control.Arrow.ArrowIf</TITLE
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>hxt-8.3.2: A collection of tools for processing XML with Haskell.</TD
><TD CLASS="topbut"
><A HREF="index.html"
>Contents</A
></TD
><TD CLASS="topbut"
><A HREF="doc-index.html"
>Index</A
></TD
></TR
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><TR
><TD CLASS="modulebar"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
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><TD
><FONT SIZE="6"
>Control.Arrow.ArrowIf</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>portable</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>experimental</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>Uwe Schmidt (uwe\@fh-wedel.de)</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
><P
>Version    : $Id: ArrowIf.hs,v 1.8 2006<EM
>05</EM
>04 14:17:53 hxml Exp $
</P
><P
>Conditionals for List Arrows
</P
><P
>This module defines conditional combinators for list arrows.
</P
><P
>The empty list as result represents False, none empty lists True.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
> <A HREF="Control-Arrow-ArrowList.html#t%3AArrowList"
>ArrowList</A
> a =&gt; <A HREF="#t%3AArrowIf"
>ArrowIf</A
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3AifA"
>ifA</A
> ::  a b c -&gt; a b d -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AifP"
>ifP</A
> ::  (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b d -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Aneg"
>neg</A
> ::  a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Awhen"
>when</A
> ::  a b b -&gt; a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwhenP"
>whenP</A
> ::  a b b -&gt; (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwhenNot"
>whenNot</A
> ::  a b b -&gt; a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwhenNotP"
>whenNotP</A
> ::  a b b -&gt; (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Aguards"
>guards</A
> ::  a b c -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AguardsP"
>guardsP</A
> ::  (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AfilterA"
>filterA</A
> ::  a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Acontaining"
>containing</A
> ::  a b c -&gt; a c d -&gt; a b c</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AnotContaining"
>notContaining</A
> ::  a b c -&gt; a c d -&gt; a b c</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AorElse"
>orElse</A
> ::  a b c -&gt; a b c -&gt; a b c</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AchoiceA"
>choiceA</A
> ::  [<A HREF="Control-Arrow-ArrowIf.html#t%3AIfThen"
>IfThen</A
> (a b c) (a b d)] -&gt; a b d</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AtagA"
>tagA</A
> ::  a b c -&gt; a b (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Either.html#t%3AEither"
>Either</A
> b b)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AspanA"
>spanA</A
> ::  a b b -&gt; a [b] ([b], [b])</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3ApartitionA"
>partitionA</A
> ::  a b b -&gt; a [b] ([b], [b])</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AIfThen"
>IfThen</A
> a b = a <A HREF="#v%3A%3A-%3E"
>:-&gt;</A
> b</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
> <A HREF="Control-Arrow-ArrowList.html#t%3AArrowList"
>ArrowList</A
> a =&gt; <A NAME="t:ArrowIf"
><A NAME="t%3AArrowIf"
></A
></A
><B
>ArrowIf</B
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
><P
>The interface for arrows as conditionals.
</P
><P
>Requires list arrows because False is represented as empty list, True as none empty lists.
</P
><P
>Only <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AifA"
>ifA</A
></TT
> and <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AorElse"
>orElse</A
></TT
> don't have default implementations
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="section4"
>Methods</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A NAME="v:ifA"
><A NAME="v%3AifA"
></A
></A
><B
>ifA</B
> ::  a b c -&gt; a b d -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="doc"
>if lifted to arrows
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:ifP"
><A NAME="v%3AifP"
></A
></A
><B
>ifP</B
> ::  (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b d -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="doc"
>shortcut: <TT
> ifP p = ifA (isA p) </TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:neg"
><A NAME="v%3Aneg"
></A
></A
><B
>neg</B
> ::  a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
>negation: <TT
> neg f = ifA f none this </TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:when"
><A NAME="v%3Awhen"
></A
></A
><B
>when</B
> ::  a b b -&gt; a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
><TT
> f `when` g </TT
> : when the predicate g holds, f is applied, else the identity filter this
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:whenP"
><A NAME="v%3AwhenP"
></A
></A
><B
>whenP</B
> ::  a b b -&gt; (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
>shortcut: <TT
> f `whenP` p = f `when` (isA p) </TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:whenNot"
><A NAME="v%3AwhenNot"
></A
></A
><B
>whenNot</B
> ::  a b b -&gt; a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
><TT
> f `whenNot` g </TT
> : when the predicate g does not hold, f is applied, else the identity filter this
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:whenNotP"
><A NAME="v%3AwhenNotP"
></A
></A
><B
>whenNotP</B
> ::  a b b -&gt; (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
>like <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AwhenP"
>whenP</A
></TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:guards"
><A NAME="v%3Aguards"
></A
></A
><B
>guards</B
> ::  a b c -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="doc"
><TT
> g `guards` f </TT
> : when the predicate g holds, f is applied, else none
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:guardsP"
><A NAME="v%3AguardsP"
></A
></A
><B
>guardsP</B
> ::  (b -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
>) -&gt; a b d -&gt; a b d</TD
></TR
><TR
><TD CLASS="doc"
>like <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AwhenP"
>whenP</A
></TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:filterA"
><A NAME="v%3AfilterA"
></A
></A
><B
>filterA</B
> ::  a b c -&gt; a b b</TD
></TR
><TR
><TD CLASS="doc"
>shortcut for <TT
> f <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3Aguards"
>guards</A
></TT
> this </TT
>
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:containing"
><A NAME="v%3Acontaining"
></A
></A
><B
>containing</B
> ::  a b c -&gt; a c d -&gt; a b c</TD
></TR
><TR
><TD CLASS="doc"
><P
><TT
> f `containing` g </TT
> : keep only those results from f for which g holds
</P
><P
>definition: <TT
> f `containing` g = f &gt;&gt;&gt; g `guards` this </TT
>
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:notContaining"
><A NAME="v%3AnotContaining"
></A
></A
><B
>notContaining</B
> ::  a b c -&gt; a c d -&gt; a b c</TD
></TR
><TR
><TD CLASS="doc"
><P
><TT
> f `notContaining` g </TT
> : keep only those results from f for which g does not hold
</P
><P
>definition: <TT
> f `notContaining` g = f &gt;&gt;&gt; ifA g none this </TT
>
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:orElse"
><A NAME="v%3AorElse"
></A
></A
><B
>orElse</B
> ::  a b c -&gt; a b c -&gt; a b c</TD
></TR
><TR
><TD CLASS="doc"
><TT
> f `orElse` g </TT
> : directional choice: if f succeeds, the result of f is the result, else g is applied
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:choiceA"
><A NAME="v%3AchoiceA"
></A
></A
><B
>choiceA</B
> ::  [<A HREF="Control-Arrow-ArrowIf.html#t%3AIfThen"
>IfThen</A
> (a b c) (a b d)] -&gt; a b d</TD
></TR
><TR
><TD CLASS="doc"
><P
>generalisation of <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AorElse"
>orElse</A
></TT
> for multi way branches like in case expressions.
</P
><P
>An auxiliary data type <TT
><A HREF="Control-Arrow-ArrowIf.html#t%3AIfThen"
>IfThen</A
></TT
> with an infix constructor ':-&gt;' is used for writing multi way branches
</P
><P
>example: <TT
> choiceA [ p1 :-&gt; e1, p2 :-&gt; e2, this :-&gt; default ] </TT
>
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:tagA"
><A NAME="v%3AtagA"
></A
></A
><B
>tagA</B
> ::  a b c -&gt; a b (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Either.html#t%3AEither"
>Either</A
> b b)</TD
></TR
><TR
><TD CLASS="doc"
>tag a value with Left or Right, if arrow has success, input is tagged with Left, else with Right
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:spanA"
><A NAME="v%3AspanA"
></A
></A
><B
>spanA</B
> ::  a b b -&gt; a [b] ([b], [b])</TD
></TR
><TR
><TD CLASS="doc"
><P
>split a list value with an arrow and returns a pair of lists.
 This is the arrow version of <TT
><A HREF="/usr/share/doc/ghc/libraries/base/Data-List.html#v%3Aspan"
>span</A
></TT
>. The arrow is deterministic.
</P
><P
>example: <TT
> runLA (spanA (isA (/= '-'))) &quot;abc-def&quot; </TT
> gives <TT
> [(&quot;abc&quot;,&quot;-def&quot;)] </TT
> as result
</P
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:partitionA"
><A NAME="v%3ApartitionA"
></A
></A
><B
>partitionA</B
> ::  a b b -&gt; a [b] ([b], [b])</TD
></TR
><TR
><TD CLASS="doc"
><P
>partition a list of values into a pair of lists
</P
><P
>This is the arrow Version of <TT
><A HREF="/usr/share/doc/ghc/libraries/base/Data-List.html#v%3Apartition"
>partition</A
></TT
>
</P
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:ArrowIf')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:ArrowIf" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Control-Arrow-ArrowIf.html#t%3AArrowIf"
>ArrowIf</A
> <A HREF="Control-Arrow-ListArrow.html#t%3ALA"
>LA</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Arrow-ArrowIf.html#t%3AArrowIf"
>ArrowIf</A
> <A HREF="Control-Arrow-IOListArrow.html#t%3AIOLA"
>IOLA</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Arrow-ArrowIf.html#t%3AArrowIf"
>ArrowIf</A
> (<A HREF="Control-Arrow-StateListArrow.html#t%3ASLA"
>SLA</A
> s)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Arrow-ArrowIf.html#t%3AArrowIf"
>ArrowIf</A
> (<A HREF="Control-Arrow-IOStateListArrow.html#t%3AIOSLA"
>IOSLA</A
> s)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:IfThen"
><A NAME="t%3AIfThen"
></A
></A
><B
>IfThen</B
> a b </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>an auxiliary data type for <TT
><A HREF="Control-Arrow-ArrowIf.html#v%3AchoiceA"
>choiceA</A
></TT
>
</TD
></TR
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
>a <A NAME="v::->"
><A NAME="v%3A%3A-%3E"
></A
></A
><B
>:-&gt;</B
> b</TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.5.0</TD
></TR
></TABLE
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