我从XML文件中提取一些数据时遇到问题。如果有多个,我仍然无法弄清楚如何处理ph:Element
的ph:Attribute
,但输出应该看起来像(s_rel0 = 5, par_s_rel0 = 5)
而不是(s_rel0 = 5)(par_s_rel0 = 5)
。也许是如果那么的情况!?
第二个连接应该由flange_b
组成,而不是flange_a
.我在错误时搜索,但找不到它。
你知道我哪里做错了吗!?感谢您的帮助。
.XML:
<?xml version="1.0" encoding="UTF-8"?>
<ph:Graphs xmlns:ph="http://www.merge.something.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ph:Graph name="mass_spring_mo">
<ph:Element id="0" type="Fixed">
<ph:Port id="1" type="port">
<ph:Attribute>
<ph:AttributeField name="type" value="string"/>
<ph:AttributeField name="name" value="type"/>
<ph:AttributeField name="value" value="flange"/>
</ph:Attribute>
</ph:Port>
</ph:Element>
<ph:Element id="2" type="Spring">
<ph:Attribute>
<ph:AttributeField name="type" value="int"/>
<ph:AttributeField name="name" value="s_rel0"/>
<ph:AttributeField name="value" value="5"/>
</ph:Attribute>
<ph:Attribute>
<ph:AttributeField name="type" value="int"/>
<ph:AttributeField name="name" value="par_s_rel0"/>
<ph:AttributeField name="value" value="5"/>
</ph:Attribute>
<ph:Port id="3" type="port">
<ph:Attribute>
<ph:AttributeField name="type" value="string"/>
<ph:AttributeField name="name" value="type"/>
<ph:AttributeField name="value" value="flange_a"/>
</ph:Attribute>
</ph:Port>
<ph:Port id="4" type="port">
<ph:Attribute>
<ph:AttributeField name="type" value="string"/>
<ph:AttributeField name="name" value="type"/>
<ph:AttributeField name="value" value="flange_b"/>
</ph:Attribute>
</ph:Port>
</ph:Element>
<ph:Element id="5" type="Mass">
<ph:Port id="6" type="port">
<ph:Attribute>
<ph:AttributeField name="type" value="string"/>
<ph:AttributeField name="name" value="type"/>
<ph:AttributeField name="value" value="flange_a"/>
</ph:Attribute>
</ph:Port>
</ph:Element>
<ph:Edge id="7" sourceid="1" targetid="3"/>
<ph:Edge id="8" sourceid="4" targetid="6"/>
</ph:Graph>
</ph:Graphs>
XSLT:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ph="http://www.merge.something.com">
<xsl:output indent="yes" method="text"/>
<xsl:template match="/">
<xsl:apply-templates select="ph:Graphs/ph:Graph"/>
</xsl:template>
<xsl:template match="ph:Graph">
<xsl:text>model</xsl:text>
<xsl:value-of select="@name"/>
<xsl:text></xsl:text>
<xsl:apply-templates select="ph:Element"/>
<xsl:text>equation</xsl:text>
<xsl:apply-templates select="ph:Edge"/>
<xsl:text>end</xsl:text>
<xsl:value-of select="@name"/>
<xsl:text>;</xsl:text>
</xsl:template>
<xsl:template match="ph:Element">
<xsl:text> Components.</xsl:text>
<xsl:value-of select="@type"/>
<xsl:text > </xsl:text>
<xsl:value-of select="translate(@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
<xsl:value-of select="@id"/>
<xsl:apply-templates select="ph:Attribute"/>
<xsl:text>;</xsl:text>
</xsl:template>
<xsl:template match="ph:Element/ph:Attribute">
<xsl:choose>
<xsl:when test="ph:AttributeField[@name = 'type' and @value='int']">
<xsl:text>(</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'name']/@value"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'value']/@value" />
<xsl:text>)</xsl:text>
</xsl:when>
<xsl:when test="ph:AttributeField[@name = 'type' and @value='string']">
<xsl:text>(</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'name']/@value"/>
<xsl:text> = '</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'value']/@value" />
<xsl:text>')</xsl:text>
</xsl:when>
</xsl:choose>
</xsl:template>
<xsl:template match="ph:Port/ph:Attribute">
<xsl:if test="ph:AttributeField/@value=type">
<xsl:apply-templates select="ph:AttributeField"/>
</xsl:if>
</xsl:template>
<xsl:template match="ph:AttributeField">
</xsl:template>
<xsl:template match="ph:Edge">
<xsl:variable name="sourceid" select="@sourceid"/>
<xsl:variable name="targetid" select="@targetid"/>
<xsl:variable name="SourceElement" select="//ph:Element[ph:Port[@id = $sourceid]]"/>
<xsl:variable name="TargetElement" select="//ph:Element[ph:Port[@id = $targetid]]"/>
<xsl:text> connect(</xsl:text>
<xsl:value-of select="translate($SourceElement/@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" />
<xsl:value-of select="$SourceElement/@id" />
<xsl:text>.</xsl:text>
<xsl:value-of select="$SourceElement/ph:Port/ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
<xsl:text>,</xsl:text>
<xsl:value-of select="translate($TargetElement/@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" />
<xsl:value-of select="$TargetElement/@id" />
<xsl:text>.</xsl:text>
<xsl:value-of select="$TargetElement/ph:Port/ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
<xsl:text >);</xsl:text>
</xsl:template>
</xsl:stylesheet>
输出:
model mass_spring_mo
Components.Fixed fixed0;
Components.Spring spring2(s_rel0 = 5, par_s_rel0 = 5);
Components.Mass mass5;
equation
connect(fixed0.flange,spring2.flange_a);
connect(spring2.flange_b,mass5.flange_a);
end mass_spring_mo;
以下是你在 xslt 中执行 if-else 的方法
<xsl:choose>
<xsl:when test="@ordered=1">
<ol>
<xsl:apply-templates select="item-ordered" />
</ol>
</xsl:when>
<xsl:otherwise>
<ul>
<xsl:apply-templates select="item-unordered" />
</ul>
</xsl:otherwise>
</xsl:choose>
输出应如下所示
(s_rel0 = 5, par_s_rel0 = 5)
关于括号,只需在相关模板中添加/附加一些条件:
<xsl:template match="ph:Element/ph:Attribute">
<xsl:if test="count(preceding-sibling::*[1][local-name()='Attribute'])=0">
<xsl:text>(</xsl:text>
</xsl:if>
<!-- xsl:choose -->
<xsl:if test="count(following-sibling::*[1][local-name()='Attribute'])=0">
<xsl:text>)</xsl:text>
</xsl:if>
<xsl:if test="count(following-sibling::*[1][local-name()='Attribute'])=1">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:template>
第二个连接应该包括
flange_b
而不是flange_a
关于错误的连接,您需要更改最后一个模板中的两行,特别是那些选择值的行:
<xsl:value-of select="$SourceElement/
ph:Port[@id=$sourceid]/
ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
<xsl:value-of select="$TargetElement/
ph:Port[@id=$targetid]/
ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
这是因为:
//ph:Element[ph:Port[@id = $sourceid]]
您正在选择整个ph:Element
节点,因此之后需要重新匹配。您的模板适用于第一次连接的事实只是一个案例。
以我的拙见,一个好的 XSLT 代码没有 if/else 结构。以下是仅基于模板覆盖的版本:
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ph="http://www.merge.something.com">
<xsl:output indent="yes" method="text"/>
<xsl:key name="ports" match="//ph:Element/ph:Port" use="@id" />
<xsl:template match="/">
<xsl:apply-templates select="ph:Graphs/ph:Graph"/>
<xsl:text> </xsl:text><!-- new line -->
</xsl:template>
<xsl:template match="ph:Graph">
<xsl:text>model </xsl:text>
<xsl:value-of select="@name"/>
<xsl:text> </xsl:text><!-- new line -->
<xsl:apply-templates select="ph:Element"/>
<xsl:text>equation</xsl:text>
<xsl:text> </xsl:text><!-- new line -->
<xsl:apply-templates select="ph:Edge"/>
<xsl:text>end </xsl:text>
<xsl:value-of select="@name"/>
<xsl:text>;</xsl:text>
</xsl:template>
<!-- ph:Element with at least one ph:Attribute child -->
<xsl:template match="ph:Element[ph:Attribute]">
<xsl:text> Components.</xsl:text>
<xsl:value-of select="@type"/>
<xsl:text> </xsl:text>
<xsl:value-of select="translate(@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
<xsl:value-of select="@id"/>
<xsl:text>(</xsl:text>
<xsl:apply-templates select="ph:Attribute"/>
<xsl:text>)</xsl:text>
<xsl:text>; </xsl:text>
</xsl:template>
<!-- ph:Element by default -->
<xsl:template match="ph:Element">
<xsl:text> Components.</xsl:text>
<xsl:value-of select="@type"/>
<xsl:text > </xsl:text>
<xsl:value-of select="translate(@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
<xsl:value-of select="@id"/>
<xsl:apply-templates select="ph:Attribute"/>
<xsl:text>; </xsl:text>
</xsl:template>
<!-- Port/Attribute elements are rendered as : "type.value" -->
<xsl:template match="ph:Port/ph:Attribute">
<xsl:apply-templates select="ph:AttributeField[@name='type']" />
<xsl:text>.</xsl:text>
<xsl:apply-templates select="ph:AttributeField[@name='value']" />
</xsl:template>
<!-- First element attribute is rendered as : "name = value" -->
<xsl:template match="ph:Element/ph:Attribute">
<xsl:apply-templates select="ph:AttributeField[@name='name']" />
<xsl:text> = </xsl:text>
<xsl:apply-templates select="ph:AttributeField[@name='value']" />
</xsl:template>
<!-- Other element attributes are rendered as : ", name = value" -->
<xsl:template match="ph:Element/ph:Attribute[position() > 1]">
<xsl:text>, </xsl:text>
<xsl:apply-templates select="ph:AttributeField[@name='name']" />
<xsl:text> = </xsl:text>
<xsl:apply-templates select="ph:AttributeField[@name='value']" />
</xsl:template>
<!-- By default, an AttributeField is rendered by displaying its "value" attribute -->
<xsl:template match="ph:AttributeField">
<xsl:value-of select="@value" />
</xsl:template>
<!-- "type" AttributeFields are not displayed -->
<xsl:template match="ph:AttributeField[@name='type']" />
<!-- "value" AttributeField whose "type" brother says that it's a 'string' are rendered with single quotes (but only for ph:Element not for ph:Port)-->
<xsl:template match="ph:Element/ph:Attribute/ph:AttributeField[@name='value'][../ph:AttributeField[@name='type']/@value = 'string']">
<xsl:text>'</xsl:text>
<xsl:value-of select="@value" />
<xsl:text>'</xsl:text>
</xsl:template>
<xsl:template match="ph:Port">
<xsl:value-of select="translate(../@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" />
<xsl:value-of select="../@id" />
<xsl:apply-templates select="ph:Attribute" />
</xsl:template>
<xsl:template match="ph:Edge">
<xsl:variable name="SourceElement" select="key('ports', @sourceid)"/>
<xsl:variable name="TargetElement" select="key('ports', @targetid)"/>
<xsl:text> connect(</xsl:text>
<xsl:apply-templates select="$SourceElement" />
<xsl:text>, </xsl:text>
<xsl:apply-templates select="$TargetElement" />
<xsl:text >);</xsl:text>
<xsl:text> </xsl:text><!-- new line -->
</xsl:template>
</xsl:stylesheet>
顺便一提。。。我添加了一个 xsl:key 元素来索引 ph:Ports,与//ph:Element[ph:Port[@id = $sourceid]]
相比,它可以节省处理时间
<xsl:template match="/">
<xsl:apply-templates select="ph:Graphs/ph:Graph"/>
</xsl:template>
<xsl:template match="ph:Graph">
<xsl:text>model </xsl:text>
<xsl:value-of select="@name"/>
<xsl:apply-templates select="ph:Element"/>
<xsl:text>equation</xsl:text>
<xsl:apply-templates select="ph:Edge"/>
<xsl:text>end</xsl:text>
<xsl:value-of select="@name"/>
<xsl:text>;</xsl:text>
</xsl:template>
<xsl:template match="ph:Element">
<xsl:text>Components.</xsl:text>
<xsl:value-of select="@type"/>
<xsl:text> </xsl:text>
<xsl:value-of select="translate(@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
<xsl:value-of select="@id"/>
<xsl:apply-templates select="ph:Attribute"/>
<xsl:text>;</xsl:text>
</xsl:template>
<xsl:template match="ph:Attribute">
<xsl:variable name="count">
<xsl:for-each select=".">
<xsl:if test="ph:AttributeField[@name='type' and @value='int']">
<xsl:value-of select="count(../ph:Attribute)"/>
</xsl:if>
</xsl:for-each>
</xsl:variable>
<xsl:choose>
<xsl:when test="position()<$count">
<xsl:text> (</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'name']/@value"/>
<xsl:text>=</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'value']/@value"/>
<xsl:text>,</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text> </xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'name']/@value"/>
<xsl:text>=</xsl:text>
<xsl:value-of select="ph:AttributeField[@name = 'value']/@value"/>
<xsl:text>)</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="ph:Edge">
<xsl:variable name="sourceid" select="@sourceid"/>
<xsl:variable name="targetid" select="@targetid"/>
<xsl:variable name="SourceElement" select="//ph:Element[ph:Port[@id = $sourceid]]"/>
<xsl:variable name="TargetElement" select="//ph:Element[ph:Port[@id = $targetid]]"/>
<xsl:variable name="SourcePort" select="../ph:Element/ph:Port[@id = $sourceid]"/>
<xsl:variable name="TargetPort" select="../ph:Element/ph:Port[@id = $targetid]"/>
<xsl:text> connect(</xsl:text>
<xsl:value-of select="translate($SourceElement/@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" />
<xsl:value-of select="$SourceElement/@id" />
<xsl:text>.</xsl:text>
<xsl:value-of select="$SourcePort/ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
<xsl:text>,</xsl:text>
<xsl:value-of select="translate($TargetElement/@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')" />
<xsl:value-of select="$TargetElement/@id" />
<xsl:text>.</xsl:text>
<xsl:value-of select="$TargetPort/ph:Attribute/ph:AttributeField[@name = 'value']/@value" />
<xsl:text >);</xsl:text>
</xsl:template>
</xsl:stylesheet>