/usr/share/yelp-xsl/xslt/mallard/common/mal-if.xsl is in yelp-xsl 3.10.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:mal="http://projectmallard.org/1.0/"
xmlns:if="http://projectmallard.org/if/1.0/"
xmlns:str="http://exslt.org/strings"
exclude-result-prefixes="mal if str"
version="1.0">
<!--!!==========================================================================
Mallard Conditionals
Support for run-time conditional processing.
:Revision:version="3.8" date="2012-11-05" status="final"
This stylesheet contains utilities for handling conditional processing
in Mallard documents.
-->
<!--@@==========================================================================
mal.if.target
The list of supported target tokens.
:Revision:version="3.8" date="2012-11-05" status="final"
This parameter takes a space-separated list of tokens to enable for conditional
processing. It is used by the template *{mal.if.test}. This parameter is meant
to hold tokens starting with #{target:}. It should usually be set by the primary
importing stylesheet.
-->
<xsl:param name="mal.if.target" select="''"/>
<!--@@==========================================================================
mal.if.platform
The list of supported platform tokens.
:Revision:version="3.8" date="2012-11-05" status="final"
This parameter takes a space-separated list of tokens to enable for conditional
processing. It is used by the template *{mal.if.test}. This parameter is meant
to hold tokens starting with #{platform:}. It should usually be set by hand or
by a customization stylesheet.
-->
<xsl:param name="mal.if.platform" select="''"/>
<!--@@==========================================================================
mal.if.features
The list of supported feature tokens.
:Revision:version="3.8" date="2012-11-05" status="final"
This parameter takes a space-separated list of tokens to enable for conditional
processing. It is used by the template *{mal.if.test}. This parameter is meant
to hold tokens that specify the capabilities of these stylesheets. It should
usually be set by the primary importing stylesheet.
-->
<xsl:param name="mal.if.features" select="'
mallard:1.0
'"/>
<!--@@==========================================================================
mal.if.custom
A custom list of supported tokens.
:Revision:version="3.8" date="2012-11-05" status="final"
This parameter takes a space-separated list of tokens to enable for conditional
processing. It is used by the template *{mal.if.test}. This parameter is meant
to hold extra values enabled by hand or by a customization stylesheet.
-->
<xsl:param name="mal.if.custom" select="''"/>
<!--@@==========================================================================
mal.if.maybe
A list of tokens that may be true.
:Revision:version="3.8" date="2012-11-05" status="final"
This parameter takes a space-separated list of tokens that may be true. The
template *{mal.if.test} returns special flags when a condition may be true,
allowing conditional processing to be deferred (for example, to CSS media
selectors). This parameter should usually be set by the primary importing
stylesheet.
-->
<xsl:param name="mal.if.maybe" select="''"/>
<xsl:variable name="_mal.if.tokens" select="concat(' ', $mal.if.target,
' ', $mal.if.platform,
' ', $mal.if.features,
' ', $mal.if.custom,
' ')"/>
<xsl:variable name="_mal.if.maybe" select="concat(' ', $mal.if.maybe, ' ')"/>
<!--**==========================================================================
mal.if.test
Test if a condition is true.
:Revision:version="3.8" date="2012-11-05" status="final"
$node: The element to check the condition for.
$test: The test expression.
This template evaluates the test expression ${test}, which is taken automatically
from the #{test} or #{if:test} attribute of $node. It splits the expression on
commas into subexpression, then splits each subexpression on spaces into tokens.
A token is taken to be true if it's in one of the space-separated lists from
@{mal.if.target}, @{mal.if.platform}, @{mal.if.features}, or @{mal.if.custom}.
If the token starts with an exclamation point, the exclamation point is stripped
and the resulting truth value is negated.
A subexpression is true if all its tokens is true. The full test expression is
true if any subexpression is true. If the test expression is true, the literal
string #{'true'} is returned. If the test expression is false, the empty
string is returned.
This template can handle "maybe" values: tokens that may or may not be true,
and whose truth values are deferred to post-transform time. A token is maybe
if it appears in the space-separated list @{mal.if.maybe}. If a subexpression
contains a maybe value and does not contain any false tokens, its truth value
is a special string constructed from the maybe tokens and starting with the
string #{if__}. If any subexpressions are maybe and none of the subexpressions
are false, the return value is a space-separated list of the maybe strings.
Maybe tokens usually must be handled specifically by the importing stylesheet.
It's usually not sufficient to just add a token to @{mal.if.maybe}. This
template will handle any maybe token, but it does not handle the actual logic
of dynamically showing or hiding content based on those tokens.
-->
<xsl:template name="mal.if.test">
<xsl:param name="node" select="."/>
<xsl:param name="test" select="($node/self::if:if/@test |
$node/self::if:when/@test |
$node/@if:test)[1]"/>
<xsl:choose>
<xsl:when test="$test != ''">
<xsl:variable name="ret">
<xsl:for-each select="str:split($test, ',')">
<xsl:text> </xsl:text>
<xsl:variable name="subexpr">
<xsl:for-each select="str:tokenize(., ' ')">
<xsl:text> </xsl:text>
<xsl:choose>
<xsl:when test="starts-with(., '!')">
<xsl:variable name="tmp">
<xsl:call-template name="_mal.if.test.check_token">
<xsl:with-param name="node" select="$node"/>
<xsl:with-param name="token" select="substring(., 2)"/>
</xsl:call-template>
</xsl:variable>
<xsl:choose>
<xsl:when test="$tmp = '1'">
<xsl:text>0</xsl:text>
</xsl:when>
<xsl:when test="$tmp = '0'">
<xsl:text>1</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="concat('not-', $tmp)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="_mal.if.test.check_token">
<xsl:with-param name="node" select="$node"/>
<xsl:with-param name="token" select="."/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
<xsl:text> </xsl:text>
</xsl:for-each>
</xsl:variable>
<xsl:choose>
<xsl:when test="contains($subexpr, ' 0 ')">
<xsl:text></xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="subcond">
<xsl:for-each select="str:tokenize($subexpr, ' ')[.!='1']">
<xsl:if test="position != 1">
<xsl:text>__</xsl:text>
</xsl:if>
<xsl:value-of select="."/>
</xsl:for-each>
</xsl:variable>
<xsl:choose>
<xsl:when test="$subcond != ''">
<xsl:text>if__</xsl:text>
<xsl:value-of select="$subcond"/>
</xsl:when>
<xsl:otherwise>
<xsl:text>true</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
<xsl:text> </xsl:text>
</xsl:variable>
<xsl:choose>
<xsl:when test="contains($ret, ' true ')">
<xsl:text>true</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:for-each select="str:split($ret, ' ')[. != 'true']">
<xsl:value-of select="."/>
<xsl:text> </xsl:text>
</xsl:for-each>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:text>true</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!--#* _mal.if.test.check_token -->
<xsl:template name="_mal.if.test.check_token">
<xsl:param name="node"/>
<xsl:param name="token"/>
<xsl:choose>
<xsl:when test="$token = 'lang:C' or $token = 'lang:c'">
<xsl:choose>
<xsl:when test="not(ancestor-or-self::*/@xml:lang)">
<xsl:text>1</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>0</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:when test="starts-with($token, 'lang:')">
<xsl:for-each select="$node">
<xsl:choose>
<xsl:when test="lang(substring($token, 6))">
<xsl:text>1</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>0</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:when>
<xsl:when test="contains($_mal.if.tokens, concat(' ', $token, ' '))">
<xsl:text>1</xsl:text>
</xsl:when>
<xsl:when test="contains($_mal.if.maybe, concat(' ', $token, ' '))">
<xsl:call-template name="_mal.if.test.flatten_token">
<xsl:with-param name="token" select="$token"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:text>0</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!--#* _mal.if.test.flatten_token -->
<xsl:template name="_mal.if.test.flatten_token">
<xsl:param name="token"/>
<xsl:for-each select="str:split($token, '')">
<xsl:choose>
<xsl:when test="contains('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_', .)">
<xsl:value-of select="."/>
</xsl:when>
<xsl:otherwise>
<xsl:text>-</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
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