[bug] XSLT empty-string document('') should refer to the stylesheet, not ENOENT #3517
Description
I just upgraded Nokogiri to 1.18.8 and it seems that the empty-string document('') construct in XSLT now raises a RuntimeError:
RuntimeError: I/O warning : failed to load "": No such file or directory
/var/lib/gems/3.3.0/gems/nokogiri-1.18.8-x86_64-linux-gnu/lib/nokogiri/xslt/stylesheet.rb:45:in `transform'
/var/lib/gems/3.3.0/gems/nokogiri-1.18.8-x86_64-linux-gnu/lib/nokogiri/xslt/stylesheet.rb:45:in `apply_to'
/home/dorian/experimental/nokogiri-empty-document.rb:43:in `block (2 levels) in <class:Test>'
This script will replicate:
#! /usr/bin/env ruby
require 'nokogiri'
require 'minitest/autorun'
class Test < Minitest::Spec
XSLT = Nokogiri::XSLT.parse <<~EOS
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:html="http://www.w3.org/1999/xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:x="urn:x-dummy"
exclude-result-prefixes="html x">
<x:foo>THIS SHOULD WORK LOL</x:foo>
<xsl:template match="html:body">
<body>
<h1><xsl:value-of select="document('')/xsl:stylesheet/x:foo[1]"/></h1>
</body>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{name()}" namespace="{namespace-uri()}">
<xsl:for-each select="@*">
<xsl:attribute name="{name()}" namespace="{namespace-uri()}">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:for-each>
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
EOS
DOC = Nokogiri.XML <<~EOS
<?xml version="1.0"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>help computer</title>
</head>
<body>
<p>this should be replaced</p>
</body>
</html>
EOS
describe "XSLT#transform" do
it "should correctly treat the special case of document('')" do
doc = XSLT.transform DOC
assert_equal 'THIS SHOULD WORK LOL',
doc.at_xpath('/html:html/html:body/html:h1[1]',
{ html: 'http://www.w3.org/1999/xhtml' }).text
end
end
endExpected behavior
The XSLT 1.0 spec stipulates that document('') is supposed to refer to the root node of the stylesheet itself:
Note that a zero-length URI reference is a reference to the document relative to which the URI reference is being resolved; thus document("") refers to the root node of the stylesheet; the tree representation of the stylesheet is exactly the same as if the XML document containing the stylesheet was the initial source document.
Environment
# Nokogiri (1.18.8)
---
warnings: []
nokogiri:
version: 1.18.8
cppflags:
- "-I/var/lib/gems/3.3.0/gems/nokogiri-1.18.8-x86_64-linux-gnu/ext/nokogiri"
- "-I/var/lib/gems/3.3.0/gems/nokogiri-1.18.8-x86_64-linux-gnu/ext/nokogiri/include"
- "-I/var/lib/gems/3.3.0/gems/nokogiri-1.18.8-x86_64-linux-gnu/ext/nokogiri/include/libxml2"
ldflags: []
ruby:
version: 3.3.7
platform: x86_64-linux-gnu
gem_platform: x86_64-linux-gnu
description: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux-gnu]
engine: ruby
libxml:
source: packaged
precompiled: true
patches:
- 0001-Remove-script-macro-support.patch
- 0002-Update-entities-to-remove-handling-of-ssi.patch
- '0009-allow-wildcard-namespaces.patch'
- 0010-update-config.guess-and-config.sub-for-libxml2.patch
- 0011-rip-out-libxml2-s-libc_single_threaded-support.patch
- '0019-xpath-Use-separate-static-hash-table-for-standard-fu.patch'
memory_management: ruby
iconv_enabled: true
compiled: 2.13.8
loaded: 2.13.8
libxslt:
source: packaged
precompiled: true
patches:
- 0001-update-config.guess-and-config.sub-for-libxslt.patch
datetime_enabled: true
compiled: 1.1.43
loaded: 1.1.43
other_libraries:
zlib: 1.3.1
libgumbo: 1.0.0-nokogiri
Additional context
It had previously been working for years?