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Re: [xsl] Challenge: do better than my implementation of "update map" and "print map"


Subject: Re: [xsl] Challenge: do better than my implementation of "update map" and "print map"
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Thu, 29 Aug 2013 22:33:17 -0700

 Roger,

This is a good exercise in Functional programming. Note the three
different ways for assembling the map to be printed -- in the code
below:

<xsl:stylesheet  version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:f="function"
 xmlns:map="http://www.w3.org/2005/xpath-functions/map">

 <xsl:output method="text"/>

     <!-- Test the two map functions -->
     <xsl:template match="/">
         <xsl:variable name="m" select="map{'Linda' := 'Rosie'}" />
         <xsl:variable name="m1" select="map:entry('Sally', 'Betsy')" />
         <xsl:variable name="m2" select="map:entry('Barb', 'Sue')" />
         <xsl:variable name="m3" select="map:entry('Nadia', 'Valerie')" />
         <xsl:variable name="m4" select="map:entry('Faye', 'Carol')" />

         <xsl:sequence select="f:print-map(map:new(($m, $m1, $m2, $m3,
$m4)))" />

==========================================
         <xsl:variable name="vMapEntries" select=
         "map-pairs(map:entry(?,?), ('Linda', 'Sally', 'Barb', 'Nadia','Faye'),
                    ('Rosie', 'Betsy', 'Sue', 'Valerie', 'Carol')
                    )"/>

         <xsl:sequence select="f:print-map(map:new($vMapEntries))" />

==========================================
         <xsl:sequence select=
         "f:print-map(fold-left(f:add-entry-to-map#2, map:new(),
$vMapEntries))" />
     </xsl:template>



     <xsl:function name="f:add-entry-to-map" as="map(xs:anyAtomicType,
item()*)">
         <xsl:param name="key" as="xs:string" />
         <xsl:param name="value" as="item()" />
         <xsl:param name="m" as="map(xs:anyAtomicType, item()*)" />

         <xsl:sequence select="map:new(($m, map:entry($key, $value)))" />
     </xsl:function>

     <xsl:function name="f:add-entry-to-map" as="map(xs:anyAtomicType,
item()*)">
         <xsl:param name="m1" as="map(xs:anyAtomicType, item()*)" />
         <xsl:param name="m2" as="map(xs:anyAtomicType, item()*)" />

         <xsl:sequence select="map:new(($m1, $m2))" />
     </xsl:function>

     <xsl:function name="f:print-map" as="item()*">
         <xsl:param name="m" as="map(xs:anyAtomicType, item()*)" />

         <xsl:sequence select="map:keys($m) ! (., '-', map:get($m, .))"/>
     </xsl:function>
 </xsl:stylesheet>

Result:

Linda - Rosie Sally - Betsy Nadia - Valerie Barb - Sue Faye - Carol
==========================================
         Linda - Rosie Sally - Betsy Nadia - Valerie Barb - Sue Faye - Carol
==========================================
         Linda - Rosie Nadia - Valerie Sally - Betsy Barb - Sue Faye - Carol

On Thu, Aug 29, 2013 at 2:16 AM, Costello, Roger L. <costello@xxxxxxxxx> wrote:
> Wow!
>
> Thank you Sean, Dimitre, and Wolfgang.
>
> You are awesome.
>
> Okay, we now have two very fine functions on maps:
>
> 1. Update an existing map with another key/value pair
>
> 2. Print the contents of a map
>
> Below is a complete, working stylesheet which tests the two map functions.
>
> /Roger
> ------------------------------------------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>                 xmlns:map="http://www.w3.org/2005/xpath-functions/map"
>                 xmlns:xs="http://www.w3.org/2001/XMLSchema"
>                 xmlns:f="function"
>                 version="3.0">
>
>     <xsl:template match="/">
>         <xsl:variable name="m" select="map{'Linda' := 'Rosie'}" />
>
>         <xsl:variable name="m1" select="f:add-entry-to-map('Sally', 'Betsy', $m)" />
>         <xsl:variable name="m2" select="f:add-entry-to-map('Barb', 'Sue', $m1)" />
>         <xsl:variable name="m3" select="f:add-entry-to-map('Nadia', 'Valerie', $m2)" />
>         <xsl:variable name="m4" select="f:add-entry-to-map('Faye', 'Carol', $m3)" />
>
>         <xsl:sequence select="f:print-map($m4)" />
>
>         <!-- The output is:
>                Linda - Rosie
>                Sally - Betsy
>                Barb - Sue
>                Nadia - Valerie
>                Faye - Carol
>         -->
>
>     </xsl:template>
>
>     <xsl:function name="f:add-entry-to-map" as="map(xs:anyAtomicType, item()*)">
>         <xsl:param name="key" as="xs:anyAtomicType" />
>         <xsl:param name="value" as="item()*" />
>         <xsl:param name="m" as="map(xs:anyAtomicType, item()*)" />
>
>         <xsl:sequence select="map:new(($m, map:entry($key, $value)), map:collation($m) )" />
>
>     </xsl:function>
>
>     <xsl:function name="f:print-map" as="xs:string*">
>         <xsl:param name="m" as="map(xs:anyAtomicType, item()*)" />
>
>         <xsl:sequence select="map:keys($m) ! (., ' - ', map:get($m, .))"/>
>
>     </xsl:function>
>
> </xsl:stylesheet>
>



-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.


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