如何在xsl-fo中正确显示制表? [英] How to show correctly tabulation in xsl-fo?

问题描述

我有一个XML文档，我正在创建一个XSL-FO文件，以使用apache-fop将其转换为pdf.

I have an XML document and I am creating an XSL-FO file to convert it to pdf with apache-fop.

在xml中，有< code>部分显示...代码.

In the xml, there are sections <code> to show... code.

在xsl-fo中，我添加了white-space ="pre"语句以保留代码格式，但是列表显示为单个空格:

In the xsl-fo, I added the white-space="pre" sentence to preserve the code format, but tabulations are shown like single space:

XML部分:

<code><![CDATA[
function callback( widget )
{
    var ui = widget; // It should be a tab
}
]]></code>

XSL-FO部分:

<xsl:template match="code">
    <fo:block font-size="10pt" font-family="monospace" white-space="pre" color="#008000" background-color="#f8f8f8">
        <xsl:apply-templates/>
    </fo:block>
</xsl:template>

生成的PDF:

function callback( widget )
{
 var ui = widget;  // It should be a tab
}

所以我的问题是:如何保留或设置表格的大小?

我正在使用apache-fop 1.1

Edited: I am using apache-fop 1.1

完整示例:

proyecto.xml(不要忘记在"var ui ..."之前用制表符代替4个空格)

proyecto.xml (do not forget to replace the 4 spaces by a tab before "var ui...")

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="proyecto.xsl"?>
<document>
<code><![CDATA[
function callback( widget )
{
    var ui = widget; // It should be a tab
}
]]></code>
</document>

proyecto.xsl

proyecto.xsl

<xsl:stylesheet
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
    xmlns:fo="http://www.w3.org/1999/XSL/Format">

    <xsl:template match ="document">
        <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
            <fo:layout-master-set>
                <fo:simple-page-master master-name="OnePage" margin="1in" 
                    page-height="29.7cm" 
                    page-width="21cm"
                    margin-top="2.5cm"
                    margin-bottom="2.5cm"
                    margin-left="3.5cm"
                    margin-right="2.5cm">
                    <fo:region-body margin="0cm"/>
                </fo:simple-page-master>
                <fo:page-sequence-master master-name="Page">
                    <fo:single-page-master-reference master-reference="OnePage"/>
                </fo:page-sequence-master>
            </fo:layout-master-set>

            <fo:page-sequence master-reference="Page">
                <fo:flow flow-name="xsl-region-body">
                    <xsl:apply-templates/>
                </fo:flow>
            </fo:page-sequence>
        </fo:root>
    </xsl:template>

    <xsl:template match="code">
        <fo:block font-size="10pt" font-family="monospace" white-space="pre">
            <xsl:apply-templates/>
            <!--<xsl:value-of select="replace( . , 'a', 'b')"/>-->
        </fo:block>
    </xsl:template>

</xsl:stylesheet>

PDF结果(屏幕):

PDF result (screen):

推荐答案

按注释中的@mzjn的建议，将选项卡替换为四个空格.

Replace the tabs by four spaces, as suggested by @mzjn already in the comments.

XML输入

<code><![CDATA[
function callback( widget )
{
&#09;var ui = widget; // It should be a tab
}
]]></code>

XSLT样式表

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <xsl:output method="xml" indent="yes"/>

  <xsl:template match="/">
    <fo:root>
      <fo:layout-master-set>
        <fo:simple-page-master master-name="A4-portrait"
              page-height="29.7cm" page-width="21.0cm" margin="2cm">
          <fo:region-body/>
        </fo:simple-page-master>
      </fo:layout-master-set>
      <fo:page-sequence master-reference="A4-portrait">
        <fo:flow flow-name="xsl-region-body">
          <fo:block font-size="10pt" font-family="monospace" linefeed-treatment="preserve" white-space-collapse="false" white-space-treatment="preserve" wrap-option="no-wrap" color="#008000" background-color="#f8f8f8">
            <xsl:value-of select="replace(code,'&#09;','    ')"/>
          </fo:block>
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
  </xsl:template>

</xsl:stylesheet>

现在，用空格替换制表符后，输出将由FOP正确呈现.

Now, after replacing the tab characters with whitespaces, the output is rendered correctly by FOP.

输出选项卡没有明显的缺陷，但是请记住，就whitespace-treatment属性而言，Apache FOP仅部分兼容:

There is no obvious flaw with outputting tabs, but bear in mind that Apache FOP is only partially compliant in regard to the whitespace-treatment property: http://xmlgraphics.apache.org/fop/compliance.html , even if it says that only fo:inline elements are affected of this.

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