Module: Duxml::RelaxNG

Includes:
Duxml
Included in:
Grammar
Defined in:
lib/duxml/meta/grammar/relax_ng.rb

Overview

contains methods to convert Rules into a valid RelaxNG schema file

Instance Attribute Summary

Attributes included from Duxml

#doc

Attributes included from Saxer

#io

Instance Method Summary collapse

Methods included from Duxml

#load, #log, #save, #validate

Methods included from Saxer

#sax

Instance Method Details

#relaxng(output_path = nil) ⇒ Nokogiri::XML::RelaxNG

Returns RelaxNG schema object.

Parameters:

  • output_path (String) (defaults to: nil) —

    optional, output path for .rng file

Returns:

  • (Nokogiri::XML::RelaxNG) —

    RelaxNG schema object



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# File 'lib/duxml/meta/grammar/relax_ng.rb', line 14

def relaxng(output_path=nil)
  doc = Doc.new
  doc << Element.new('grammar')
  doc.grammar[:xmlns] = 'http://relaxng.org/ns/structure/1.0'
  doc.grammar[:datatypeLibrary] = 'http://www.w3.org/2001/XMLSchema-datatypes'
  start = Element.new('start')
  start[:combine] = 'choice'
  ref = Element.new('ref')
  ref[:name] = rules.first.subject
  start << ref
  doc.grammar << start
  rules.each do |rule|
    rule.relaxng doc.grammar
  end

  # fill in empty doc definitions to make them legal

  element_defs = doc.grammar.Define.collect do |d|
    d.element if d.nodes.first.name == 'element' and d.element.nodes.empty?
  end.compact
  element_defs.each do |element_def|
    element_def << Element.new('empty')
  end
  doc.write_to output_path if output_path
  doc
end