Nokogiri XSLT transform using multiple source XML files - ruby

Question

I want to translate XML using Nokogiri. I built an XSL and it all works fine. I ALSO tested it in Intellij. My data comes from two XML files.
My problem occurs when I try to get Nokogiri to do the transform. I can't seem to find a way to get it to parse multiple source files.
This is the code I am using from the documentation:
require 'Nokogiri'
doc1 = Nokogiri::XML(File.read('F:/transcoder/xslt_repo/core_xml.xml',))
xslt = Nokogiri::XSLT(File.read('F:/transcoder/xslt_repo/google.xsl'))
puts xslt.transform(doc1)
I tried:
require 'Nokogiri'
doc1 = Nokogiri::XML(File.read('F:/transcoder/xslt_repo/core_xml.xml',))
doc2 = Nokogiri::XML(File.read('F:/transcoder/xslt_repo/file_data.xml',))
xslt = Nokogiri::XSLT(File.read('F:/transcoder/xslt_repo/test.xsl'))
puts xslt.transform(doc1,doc2)
However it seems transform only takes one argument, so at the moment I am only able to parse half the data I need:
<?xml version="1.0"?>
<package package_id="LB000001">
<asset_metadata>
<series_title>test asset 1</series_title>
<season_title>Number 1</season_title>
<episode_title>ET 1</episode_title>
<episode_number>1</episode_number>
<license_start_date>21-07-2016</license_start_date>
<license_end_date>31-07-2016</license_end_date>
<rating>15</rating>
<synopsis>This is a test asset</synopsis>
</asset_metadata>
<video_file>
<file_name/>
<file_size/>
<check_sum/>
</video_file>
<image_1>
<file_name/>
<file_size/>
<check_sum/>
</image_1>
</package>
How can I get this to work?
Edit:
This is the core_metadata.xml which is created via a PHP code block and the data comes from a database.
<?xml version="1.0" encoding="utf-8"?>
<manifest task_id="00000000373">
<asset_metadata>
<material_id>LB111111</material_id>
<series_title>This is a test</series_title>
<season_title>This is a test</season_title>
<season_number>1</season_number>
<episode_title>that test</episode_title>
<episode_number>2</episode_number>
<start_date>23-08-2016</start_date>
<end_date>31-08-2016</end_date>
<ratings>15</ratings>
<synopsis>this is a test</synopsis>
</asset_metadata>
<file_info>
<source_filename>LB111111</source_filename>
<number_of_segments>2</number_of_segments>
<segment_1 seg_1_start="00:00:10.000" seg_1_dur="00:01:00.000"/>
<segment_2 seg_2_start="00:02:00.000" seg_2_dur="00:05:00.000"/>
<conform_profile definition="hd" aspect_ratio="16f16">ffmpeg -i S_PATH/F_NAME.mp4 SEG_CONFORM 2> F:/Transcoder/logs/transcode_logs/LOG_FILE.txt</conform_profile>
<transcode_profile profile_name="xbox" package_type="tar">ffmpeg -f concat -i T_PATH/CONFORM_LIST TRC_PATH/F_NAME.mp4 2> F:/Transcoder/logs/transcode_logs/LOG_FILE.txt</transcode_profile>
<target_path>F:/profiles/xbox</target_path>
</file_info>
</manifest>
The second XML (file_date.xml) is dynamically create during the trancode process by nokogiri:
<?xml version="1.0"?>
<file_data>
<video_file>
<file_name>LB111111_xbox_230816114438.mp4</file_name>
<file_size>141959922</file_size>
<md5_checksum>bac7670e55c0694059d3742285079cbf</md5_checksum>
</video_file>
<image_1>
<file_name>test</file_name>
<file_size>test</file_size>
<md5_checksum>test</md5_checksum>
</image_1>
</file_data>
I managed to work around this issue by making a call to by hard coding the file_date.xml into the XSLT file:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<package>
<xsl:attribute name="package_id">
<xsl:value-of select="manifest/asset_metadata/material_id"/>
</xsl:attribute>
<asset_metadata>
<series_title>
<xsl:value-of select="manifest/asset_metadata/series_title"/>
</series_title>
<season_title>
<xsl:value-of select="manifest/asset_metadata/season_title"/>
</season_title>
<episode_title>
<xsl:value-of select="manifest/asset_metadata/episode_title"/>
</episode_title>
<episode_number>
<xsl:value-of select="manifest/asset_metadata/episode_number"/>
</episode_number>
<license_start_date>
<xsl:value-of select="manifest/asset_metadata/start_date"/>
</license_start_date>
<license_end_date>
<xsl:value-of select="manifest/asset_metadata/end_date"/>
</license_end_date>
<rating>
<xsl:value-of select="manifest/asset_metadata/ratings"/>
</rating>
<synopsis>
<xsl:value-of select="manifest/asset_metadata/synopsis"/>
</synopsis>
</asset_metadata>
<video_file>
<file_name>
<xsl:value-of select="document('file_data.xml')/file_data/video_file/file_name"/>
</file_name>
<file_size>
<xsl:value-of select="document('file_data.xml')/file_data/video_file/file_size"/>
</file_size>
<check_sum>
<xsl:value-of select="document('file_data.xml')/file_data/video_file/md5_checksum"/>
</check_sum>
</video_file>
<image_1>
<file_name>
<xsl:value-of select="document('file_data.xml')/file_data/image_1/file_name"/>
</file_name>
<file_size>
<xsl:value-of select="document('file_data.xml')/file_data/image_1/file_size"/>
</file_size>
<check_sum>
<xsl:value-of select="document('file_data.xml')/file_data/image_1/md5_checksum"/>
</check_sum>
</image_1>
</package>
</xsl:template>
I then use Saxon to do the transform:
xslt = "java -jar C:/SaxonHE9-7-0-7J/saxon9he.jar #{temp}core_metadata.xml #{temp}#{profile}.xsl > #{temp}#{file_name}.xml"
system("#{xslt}")
I would love to find a way to do this without having to hardcode the file_date.xml into the XSLT.

Answer 1

Merge XML Documents and Transform
You'll have to do a bit of work to combine the XML content prior to your XLS-Transformation. #the-Tin-Man has a nice answer to a similar question in the archives, which can be adapted for your use case.
Let's say we have the following sample content:
<!--a.xml-->
<?xml version="1.0"?>
<xml>
<packages>
<package>Data here for A</package>
<package>Another Package</package>
</packages>
</xml>
<!--a.xml-->
<!--b.xml-->
<?xml version="1.0"?>
<xml>
<packages>
<package>B something something</package>
</packages>
</xml>
<!--end b.xml-->
And we want to apply the following XLST template:
<!--transform.xslt-->
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="//packages">
<html>
<body>
<h2>Packages</h2>
<ol>
<xsl:for-each select="./package">
<li><xsl:value-of select="text()"/></li>
</xsl:for-each>
</ol>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
<!--end transform.xslt-->
If we have parallel document structure, as in this case, we can merge the two XML documents' content together and pass that along for transformation.
require 'Nokogiri'
doc1 = Nokogiri::XML(File.read('./a.xml'))
doc2 = Nokogiri::XML(File.read('./b.xml'))
moved_packages = doc2.search('package')
doc1.at('/descendant::packages[1]').add_child(moved_packages)
xslt = Nokogiri::XSLT(File.read('./transform.xslt'))
puts xslt.transform(doc1)
This would generate the following output:
<html><body>
<h2>Packages</h2>
<ol>
<li>Data here for A</li>
<li>Another Package</li>
<li>B something something</li>
</ol>
</body></html>
If your XML documents have varying structure, you may benefit from an intermediary XML nodeset that you add your content to, rather than the shortcut of merging document 2 content into document 1.