nokogiri_line_number_test.rb

require 'nokogiri'

def create_xml_doc_with_syntax_error_on_line(line_no)
  doc = []
  doc << '<?xml version="1.0" encoding="UTF-8"?>'
  doc << '<testdoc>'
  1e5.to_i.times do
    if line_no == (doc.size + 1)
      doc << '<item>b</item>'
    else
      doc << '<item>a</item>'
    end
  end
  doc << '</testdoc>'
  doc.join("\n");
end

schema_definition_file = <<-'SCHEMA'
  <grammar xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
    <define name="item-elements">
      <data type="string">
        <param name="pattern">a</param>
      </data>
    </define>
    <define name="catalog-root">
      <element>
        <anyName/>
        <oneOrMore>
          <element name="item">
            <ref name="item-elements"></ref>
          </element>
        </oneOrMore>
      </element>
    </define>
    <start>
      <ref name="catalog-root" />
    </start>
  </grammar>
SCHEMA

schema_definition = Nokogiri::XML::RelaxNG(schema_definition_file)

puts "Nokogiri: #{Gem.loaded_specs['nokogiri'].version}"

[4e2, 4e4, 7e4].each do |error_line_no|
  puts sprintf('XML document with a schema violation on line %d', error_line_no)
  xml_doc = Nokogiri.XML(create_xml_doc_with_syntax_error_on_line(error_line_no))
  schema_definition.validate(xml_doc).each_with_index do |error, i|
    puts sprintf(' %d. RelaxNG reports error on line %d: %s', i, error.line, error.message)
  end
end