XML Tutorial/XSLT stylesheet/variable — различия между версиями
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Текущая версия на 11:27, 26 мая 2010
Содержание
- 1 Define and use variable
- 2 Define variable and use it
- 3 demonstrate different ways of setting xsl:variable
- 4 Fill position to a variable
- 5 if a variable has some defined value
- 6 There is an important difference in variable value specification.
- 7 Use variable to hold a result tree
- 8 Variable assignment with choose statement
- 9 Variable scope
- 10 Variable without initialization
Define and use variable
<source lang="xml">
File: Data.xml <?xml version="1.0"?> <addressbook>
<address>
<name>
<title>Ms.</title>
<first-name>Jack</first-name>
<last-name>Smith</last-name>
</name>
<street>707 Main Way</street>
<city>New York</city>
<state>ME</state>
<zip>00218</zip>
</address>
</addressbook>
File: Transform.xslt <?xml version="1.0"?> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text" indent="no" /> <xsl:strip-space elements="*" /> <xsl:variable name="newline"> <xsl:text></xsl:text> </xsl:variable> <xsl:template match="/"> <xsl:for-each select="addressbook/address"> <xsl:sort select="name/last-name" /> <xsl:value-of select="name/title" /> <xsl:text> </xsl:text> <xsl:value-of select="name/first-name" /> <xsl:text> </xsl:text> <xsl:value-of select="name/last-name" /> <xsl:value-of select="$newline" /> <xsl:value-of select="street" /> <xsl:value-of select="$newline" /> <xsl:value-of select="city" /> <xsl:text>, </xsl:text> <xsl:value-of select="state" /> <xsl:text> </xsl:text> <xsl:value-of select="zip" /> <xsl:value-of select="$newline" /> <xsl:value-of select="$newline" /> </xsl:for-each> </xsl:template>
</xsl:stylesheet> Output: Ms. Jack Smith707 Main WayNew York, ME 00218</source>
Define variable and use it
<source lang="xml">
File: Data.xml
<x>
<input>7</input> <input>27</input>
</x> File: Transform.xslt <?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="text" indent="yes" version="1.0" />
<xsl:template match="x">
<xsl:apply-templates select="y" />
</xsl:template>
<xsl:template match="y">
<xsl:param name="x" select="/x/input" />
<xsl:variable name="y" select="$x - 1" />
<xsl:variable name="z" select="." />
<xsl:value-of select="$x" />
<xsl:text> - 1 = </xsl:text>
<xsl:value-of select="$y" />
<xsl:text>
</xsl:text>
<xsl:if test="$x > 1">
<xsl:apply-templates select="$z">
<xsl:with-param name="x" select="$x - 1" />
</xsl:apply-templates>
</xsl:if>
</xsl:template>
</xsl:stylesheet></source>
demonstrate different ways of setting xsl:variable
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
<chapter>Chapter A</chapter> <chapter>Chapter B</chapter> <chapter>Chapter C</chapter> <chapter>Chapter D</chapter>
File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="totalChapters" select="count(//chapter)"/>
<xsl:template match="/">
<xsl:value-of select="."/>
<xsl:text> (</xsl:text>
<xsl:value-of select="position()"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="$totalChapters"/>
<xsl:text>)</xsl:text>
|
</xsl:template>
</xsl:stylesheet> Output:
<?xml version="1.0" encoding="UTF-8"?>| Chapter A (1/4) |
| Chapter B (2/4) |
| Chapter C (3/4) |
| Chapter D (4/4) |
Fill position to a variable
<source lang="xml">
File: Data.xml <?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="Transform.xslt" ?> <nodeTester type="referral">
<function> <name>position() function</name> </function> <text> This function helps find the position of a node in the node list. </text>
</nodeTester> File: Transform.xslt <?xml version="1.0"?> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text" indent="no" /> <xsl:template match="nodeTester"> <xsl:apply-templates /> </xsl:template> <xsl:template match="text"> <xsl:variable name="myPositionVariable" select="position()" /> NodeList position = <xsl:value-of select="$myPositionVariable" /> </xsl:template>
</xsl:stylesheet> Output:
position() function NodeList position = 4</source>
if a variable has some defined value
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
<animal>cat</animal> <animal>dog</animal> <animal>cow</animal>
File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="color">red</xsl:variable>
<xsl:template match="//animal">
<xsl:choose>
<xsl:when test="boolean($color)">
<xsl:value-of select="."/>
</xsl:when>
<xsl:otherwise>
<paragraph>
<xsl:value-of select="."/>
</P>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>
cat
dog
cow
</source>
There is an important difference in variable value specification.
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
<AAA>
<BBB>
<CCC>C1</CCC>
</BBB>
<CCC>C2</CCC>
<CCC>C3</CCC>
</AAA>
<AAA>
<CCC>
<DDD>D1</DDD>
<DDD>D2</DDD>
</CCC>
</AAA>
File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="var1" select="//AAA/CCC/text()"/>
<xsl:variable name="var2">//AAA/CCC/text()</xsl:variable>
<xsl:template match="/">
<xsl:call-template name="function">
<xsl:with-param name="path1" select="//AAA/CCC/DDD"/>
<xsl:with-param name="path2">//AAA/CCC/DDD</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="function">
<xsl:param name="path1"/>
<xsl:param name="path2"/>
<paragraph>
<xsl:value-of select="$path2"/>
<xsl:text> : </xsl:text>
<xsl:value-of select="$path1"/>
</P>
<paragraph>
<xsl:value-of select="$var2"/>
<xsl:text> : </xsl:text>
<xsl:for-each select="$var1">
<xsl:value-of select="."/>
<xsl:text/>
</xsl:for-each>
</P>
</xsl:template>
</xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?><paragraph>//AAA/CCC/DDD : D1</P><paragraph>//AAA/CCC/text() : C2C3
</P></source>
Use variable to hold a result tree
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
| AAA | BBB |
| aaa | bbb |
| 1111111 |
| 22222222 |
File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="A1">
<xsl:copy-of select="//TABLE[1]"/>
</xsl:variable>
<xsl:variable name="A2">
<xsl:copy-of select="//TABLE[2]"/>
</xsl:variable>
<xsl:template match="/">
<xsl:copy-of select="$A2"/>
<xsl:copy-of select="$A1"/>
<xsl:copy-of select="$A2"/>
</xsl:template>
</xsl:stylesheet> Output:
<?xml version="1.0" encoding="UTF-8"?>| 1111111 |
| 22222222 |
| AAA | BBB |
| aaa | bbb |
| 1111111 |
| 22222222 |
Variable assignment with choose statement
<source lang="xml">
File: Data.xml <?xml version="1.0"?> <list xml:lang="en">
<title>title 1</title> <listitem>item 1</listitem> <listitem>item 2</listitem> <listitem>item 3</listitem> <listitem xml:lang="sw">item 4</listitem> <listitem xml:lang="en-gb">item 5</listitem> <listitem xml:lang="zu">item 6</listitem> <listitem xml:lang="jz">item 7</listitem>
</list>
File: Transform.xslt <?xml version="1.0"?> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> <xsl:variable name="favoriteNumber" select="23"/> <xsl:variable name="favoriteColor" select=""blue""/> <xsl:variable name="complicatedVariable"> <xsl:choose> <xsl:when test="count(//listitem) > 10"> <xsl:text>really long list</xsl:text> </xsl:when> <xsl:when test="count(//listitem) > 5"> <xsl:text>moderately long list</xsl:text> </xsl:when> <xsl:otherwise> <xsl:text>fairly short list</xsl:text> </xsl:otherwise> </xsl:choose> </xsl:variable> <xsl:template match="/"> <xsl:text>Hello! Your favorite number is </xsl:text> <xsl:value-of select="$favoriteNumber"/> <xsl:text>. Your favorite color is </xsl:text> <xsl:value-of select="$favoriteColor"/> <xsl:text>. Here is a </xsl:text> <xsl:value-of select="$complicatedVariable"/> <xsl:text>: </xsl:text> <xsl:variable name="listitems" select="list/listitem"/> <xsl:call-template name="processListitems"> <xsl:with-param name="items" select="$listitems"/> </xsl:call-template> </xsl:template> <xsl:template name="processListitems"> <xsl:param name="items"/> <xsl:variable name="favoriteColor"> <xsl:text>chartreuse</xsl:text> </xsl:variable> <xsl:text> (Your favorite color is now </xsl:text> <xsl:value-of select="$favoriteColor"/> <xsl:text>.) </xsl:text> <xsl:for-each select="$items"> <xsl:value-of select="position()"/> <xsl:text>. </xsl:text> <xsl:value-of select="."/> <xsl:text> </xsl:text> </xsl:for-each> </xsl:template>
</xsl:stylesheet> Output: Hello! Your favorite number is 23. Your favorite color is blue. Here is a moderately long list:
(Your favorite color is now chartreuse.)
1. item 1 2. item 2 3. item 3 4. item 4 5. item 5 6. item 6 7. item 7</source>
Variable scope
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
- A
- B
- C
File: Transform.xslt <?xml version="1.0"?> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> <xsl:template match="/"> <xsl:apply-templates select="ul/li"/> </xsl:template> <xsl:template match="li"> <xsl:variable name="single-quote"> <xsl:text>'</xsl:text> </xsl:variable> <xsl:variable name="two-quotes"> <xsl:text>''</xsl:text> </xsl:variable> <xsl:variable name="sub1"> <xsl:call-template name="replace-substring"> <xsl:with-param name="original" select="."/> <xsl:with-param name="substring" select=""&""/> <xsl:with-param name="replacement" select=""^&""/> </xsl:call-template> </xsl:variable> <xsl:variable name="sub2"> <xsl:call-template name="replace-substring"> <xsl:with-param name="original" select="$sub1"/> <xsl:with-param name="substring" select=""|""/> <xsl:with-param name="replacement" select=""^|""/> </xsl:call-template> </xsl:variable> <xsl:call-template name="replace-substring"> <xsl:with-param name="original" select="$sub2"/> <xsl:with-param name="substring" select="$single-quote"/> <xsl:with-param name="replacement" select="$two-quotes"/> </xsl:call-template> <xsl:text> </xsl:text> </xsl:template> <xsl:template name="replace-substring"> <xsl:param name="original" /> <xsl:param name="substring" /> <xsl:param name="replacement" /> <xsl:choose> <xsl:when test="contains($original, $substring)"> <xsl:value-of select="substring-before($original, $substring)" /> <xsl:value-of select="$replacement" /> <xsl:call-template name="replace-substring"> <xsl:with-param name="original" select="substring-after($original, $substring)" /> <xsl:with-param name="substring" select="$substring" /> <xsl:with-param name="replacement" select="$replacement" /> </xsl:call-template> </xsl:when> <xsl:otherwise> <xsl:value-of select="$original" /> </xsl:otherwise> </xsl:choose> </xsl:template>
</xsl:stylesheet> Output: A B C</source>
Variable without initialization
<source lang="xml">
File: Data.xml <?xml version="1.0" encoding="utf-8"?>
<animal>cat</animal> <animal>dog</animal> <animal>cow</animal>
File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="color"/>
<xsl:template match="//animal">
<xsl:choose>
<xsl:when test="boolean($color)">
<xsl:value-of select="."/>
</xsl:when>
<xsl:otherwise>
<paragraph>
<xsl:value-of select="."/>
</P>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>
<paragraph>cat</P> <paragraph>dog</P> <paragraph>cow</P></source>
