[XALANJ-2754] parse-json handles only JSON maps and objects but not the primitive values string, number, boolean nor the null value

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: The Latest Development Code
• Component/s: Xalan, XPath
• Security Level: No security risk; visible to anyone (Ordinary problems in Xalan projects. Anybody can view the issue.)
• Assignee: Mukul Gandhi
• Reporter: Martin Honnen
• Created: 22/Jun/24 11:41
• Updated: 23/Jun/24 12:35
• Resolved: 23/Jun/24 12:35

Description

This is a bug report on the XSLT 3.0 development branch of Xalan Java.

I have tested the newly introduced parse-json function on all sorts of allowed input and it appears the implementation in Xalan fails to recognize a simple JSON string, number, boolean and the null value.

 

Test case is:

 

 

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="3.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:map="http://www.w3.org/2005/xpath-functions/map"
  xmlns:array="http://www.w3.org/2005/xpath-functions/array"
  exclude-result-prefixes="xs map array">
  <xsl:output method="xml" indent="yes"/>
  <xsl:template match="array">
    <array-test>
      <xsl:variable name="xdm-array" select="parse-json(.)"/>
      <array-instance-of-test>
        <xsl:value-of select="$xdm-array instance of array(*)"/>
      </array-instance-of-test>
    </array-test>
  </xsl:template>
  <xsl:template match="map">
    <map-test>
      <xsl:variable name="xdm-map" select="parse-json(.)"/>
      <map-instance-of-test>
        <xsl:value-of select="$xdm-map instance of map(*)"/>
      </map-instance-of-test>
    </map-test>
  </xsl:template>
  
  <xsl:template match="string">
    <string-test>
      <xsl:variable name="str" select="parse-json(.)"/>
      <string-instance-of-test>
        <xsl:value-of select="$str instance of xs:string"/>
      </string-instance-of-test>
    </string-test>
  </xsl:template>
  <xsl:template match="number">
    <number-test>
      <xsl:variable name="dbl" select="parse-json(.)"/>
      <number-instance-of-test>
        <xsl:value-of select="$dbl instance of xs:double"/>
      </number-instance-of-test>
    </number-test>
  </xsl:template>
  
  <xsl:template match="boolean">
    <boolean-test>
      <xsl:variable name="bool" select="parse-json(.)"/>
      <boolean-instance-of-test>
        <xsl:value-of select="$bool instance of xs:boolean"/>
      </boolean-instance-of-test>
    </boolean-test>
  </xsl:template>
  
  <xsl:template match="empty">
    <empty-seq-test>
      <xsl:variable name="empty-seq" select="parse-json(.)"/>
      <empty-seq-instance-of-test>
        <xsl:value-of select="$empty-seq instance of item()? and empty($empty-seq)"/>
      </empty-seq-instance-of-test>
    </empty-seq-test>
  </xsl:template>
  
  <xsl:template match="/">
    <xsl:copy>
      <xsl:apply-templates/>
      <xsl:comment>Run with <xsl:value-of select="system-property('xsl:vendor')"/> at <xsl:value-of select="current-dateTime()"/></xsl:comment>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

 

 

 

Run against input sample with sample data

<root>
  <map>{ "name" : "foo", "data" : [3,2,1] }</map>
  <array>[ { "name" : "foo", "value" : 3.2 } ]</array>
  <string>"foo"</string>
  <number>42</number>
  <boolean>false</boolean>
  <empty>null</empty>
</root>

 

this with Xalan gives an error

 

<?xml version="1.0" encoding="UTF-8"?>
  <map-test>
  <map-instance-of-test>true</map-instance-of-test>
</map-test>
  <array-test>
  <array-instance-of-test>true</array-instance-of-test>
</array-test>
  file:///C:/Users/marti/IdeaProjects/xalan-java/../../OneDrive/Documents/xslt/blog-xslt-3-by-example/xalan-xslt3-tests/parse-json-test2.xsl; Zeilennummer31; Spaltennummer56; FOUT1190 : The 1st argument provided with function call fn:parse-json is not a correct json lexical string. A json string can begin only with '{' or '[' characters.

while Saxon HE 12 Java happily parses all values and outputs e.g.

<?xml version="1.0" encoding="UTF-8"?>                                                                                                     
<map-test>
   <map-instance-of-test>true</map-instance-of-test>
</map-test>
<array-test>
   <array-instance-of-test>true</array-instance-of-test>
</array-test>
<string-test>
   <string-instance-of-test>true</string-instance-of-test>
</string-test>
<number-test>
   <number-instance-of-test>true</number-instance-of-test>
</number-test>
<boolean-test>
   <boolean-instance-of-test>true</boolean-instance-of-test>
</boolean-test>
<empty-seq-test>
   <empty-seq-instance-of-test>true</empty-seq-instance-of-test>
</empty-seq-test>