Apache FOP XSLT：突出显示关键字

Question

我想在使用 apache-fop 生成的 pdf 中突出显示某些单词。因为要突出显示的单词和输入文本都是动态的，所以我认为调用 java 函数 returns xsl 内联元素是最简单的方法：

<xsl:variable name="lines" select="ext:highlight(.)"/>
<xsl:for-each select="$lines">
  <fo:block><xsl:value-of disable-output-escaping="yes" select="."/></fo:block>
</xsl:for-each>

public String highlight(String input) {
  for (String toHighlight : wordsToHighlight) {
    input = input.replaceAll(toHighlight, "<fo:inline background-color=\"yellow\">toHightlight</fo:inline>");
  }
  return input;
}

不幸的是，返回的内联元素按字面意思放在 pdf 中。我错过了什么？

此外，我已经调查了，但在我的情况下它变得太复杂了。

最小可重现示例：

@Data
public class Example {

    private Set<String> keywords = Set.of("fox", "brown");
    private String inputText = "The quick brown fox jumped over the fence.";

}

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:exsl="http://exslt.org/common"
                xmlns:fo="http://www.w3.org/1999/XSL/Format">

    <xsl:template match="/">
        <fo:root>
            <fo:layout-master-set>
                <fo:simple-page-master master-name="simpleA4">
                    <fo:region-body />
                </fo:simple-page-master>
            </fo:layout-master-set>

            <fo:page-sequence master-reference="simpleA4">
                <fo:flow flow-name="xsl-region-body">
                    <xsl:apply-templates select="example" />
                </fo:flow>
            </fo:page-sequence>
        </fo:root>
    </xsl:template>

    <xsl:template match="example">
        <xsl:apply-templates select="inputText" />
    </xsl:template>

    <xsl:variable name="dictionary">
        <entry keyword="fox" />
        <entry keyword="brown" />
    </xsl:variable>

    <xsl:template match="inputText">
        <fo:block>
            <xsl:call-template name="multi-hilite">
                <xsl:with-param name="string" select="." />
                <xsl:with-param name="entries" select="exsl:node-set($dictionary)/entry" />
            </xsl:call-template>
        </fo:block>
    </xsl:template>

    <xsl:template name="multi-hilite">
        <xsl:param name="string"/>
        <xsl:param name="entries"/>
        <xsl:choose>
            <xsl:when test="$entries">
                <xsl:call-template name="multi-hilite">
                    <xsl:with-param name="string">
                        <xsl:call-template name="hilite">
                            <xsl:with-param name="text" select="$string" />
                            <xsl:with-param name="search-string" select="$entries[1]/@keyword" />
                        </xsl:call-template>
                    </xsl:with-param>
                    <xsl:with-param name="entries" select="$entries[position() > 1]"/>
                </xsl:call-template>
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="$string"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>

    <xsl:template name="hilite">
        <xsl:param name="text"/>
        <xsl:param name="search-string"/>
        <xsl:choose>
            <xsl:when test="contains($text, $search-string)">
                <xsl:value-of select="substring-before($text, $search-string)"/>
                <fo:inline background-color="#eeee00">
                    <xsl:value-of select="$search-string"/>
                </fo:inline>
                <xsl:call-template name="hilite">
                    <xsl:with-param name="text" select="substring-after($text, $search-string)"/>
                    <xsl:with-param name="search-string" select="$search-string"/>
                </xsl:call-template>
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="$text"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>

</xsl:stylesheet>

Answer 1

考虑以下简化示例：

XML

<example>
    <keywords>
        <keyword>brown</keyword>
        <keyword>fox</keyword>
    </keywords>
    <inputText>The quick brown fox jumped over the fence.</inputText>
</example>

XSLT 1.0

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:template match="/example">
    <output>
        <xsl:call-template name="hilite-keywords">
            <xsl:with-param name="string" select="inputText"/>
            <xsl:with-param name="keywords" select="keywords/keyword"/>
        </xsl:call-template>
    </output>
</xsl:template>

<xsl:template name="hilite-keywords">
    <xsl:param name="string"/>
    <xsl:param name="keywords"/>
    <xsl:choose>
        <xsl:when test="$keywords">
            <xsl:variable name="keyword" select="$keywords[1]" />
            <xsl:choose>
                <xsl:when test="contains($string, $keyword)">
                    <!-- process substring-before with the remaining keywords -->
                    <xsl:call-template name="hilite-keywords">
                        <xsl:with-param name="string" select="substring-before($string, $keyword)"/>
                        <xsl:with-param name="keywords" select="$keywords[position() > 1]"/>
                    </xsl:call-template>
                    <!-- matched keyword -->
                    <hilite>
                        <xsl:value-of select="$keyword"/>
                    </hilite>
                    <!-- continue with substring-after -->
                    <xsl:call-template name="hilite-keywords">
                        <xsl:with-param name="string" select="substring-after($string, $keyword)"/>
                        <xsl:with-param name="keywords" select="$keywords"/>
                    </xsl:call-template>
                </xsl:when>
                <xsl:otherwise>
                    <!-- pass the entire string for processing with the remaining keywords -->
                    <xsl:call-template name="hilite-keywords">
                        <xsl:with-param name="string" select="$string"/>
                        <xsl:with-param name="keywords" select="$keywords[position() > 1]"/>
                    </xsl:call-template>
                </xsl:otherwise>
            </xsl:choose>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="$string"/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

</xsl:stylesheet>

结果

<?xml version="1.0" encoding="UTF-8"?>
<output>The quick <hilite>brown</hilite> <hilite>fox</hilite> jumped over the fence.</output>

Apache FOP XSLT：突出显示关键字

Apache FOP XSLT: Highlight keywords

java

xslt-1.0

apache-fop