Add support for PDF/A-1b

lib/prawn/document.rb

@@ -384,7 +384,7 @@ def render(*a, &b)
     #   pdf.render_file "foo.pdf"
     #
     def render_file(filename)
-      File.open(filename, 'rb+') { |f| render(f) }
+      File.open(filename, 'wb') { |f| render(f) }
     end
 
     # The bounds method returns the current bounding box you are currently in,

prawn.gemspec

@@ -46,7 +46,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('pdf-reader', ['~> 1.4', '>= 1.4.1'])
   spec.add_development_dependency('rubocop', '~> 0.47.1')
   spec.add_development_dependency('rubocop-rspec', '~> 1.10')
-  spec.add_development_dependency('nokogiri', '~> 1.7')
 
   spec.homepage = 'http://prawnpdf.org'
   spec.description = <<END_DESC

spec/prawn/pdfa_1b_spec_impl.rb

@@ -1,5 +1,5 @@
 require 'spec_helper'
-require 'prawn/vera_pdf'
+require_relative 'vera_pdf'
 
 describe Prawn::Document do
   include Prawn::VeraPdf

lib/prawn/vera_pdf.rb → spec/prawn/vera_pdf.rb

@@ -1,4 +1,4 @@
-require 'nokogiri'
+require 'rexml/document'
 require 'open3'
 
 module Prawn
@@ -29,17 +29,12 @@ def valid_pdfa_1b?(pdf_data)
     end
 
     def reported_as_compliant?(xml_data)
-      xml_doc = Nokogiri::XML xml_data
-      raise Exception, 'The veraPDF xml report was not well formed.' unless xml_doc.errors.empty?
-
-      xml_doc.remove_namespaces!
-      validation_result = xml_doc.xpath('/processorResult/validationResult')
-      assertions = validation_result.xpath('assertions/assertion')
-      assertions.each do |assertion|
-        message = assertion.at_xpath('message').content
-        clause = assertion.at_xpath('ruleId').attribute('clause').content
-        test = assertion.at_xpath('ruleId').attribute('testNumber').content
-        context = assertion.at_xpath('location/context').content
+      xml_doc = REXML::Document.new xml_data
+      xml_doc.elements.each('/processorResult/validationResult/ns2:assertions/ns2:assertion') do |element|
+        message = element.elements.to_a('ns2:message').first.text
+        clause = element.elements.to_a('ns2:ruleId').first.attributes['clause']
+        test = element.elements.to_a('ns2:ruleId').first.attributes['testNumber']
+        context = element.elements.to_a('ns2:location/ns2:context').first.text
         url = 'https://github.com/veraPDF/veraPDF-validation-profiles/wiki/PDFA-Part-1-rules'
         url_anchor = "rule-#{clause.delete('.')}-#{test}"
         puts
@@ -49,7 +44,7 @@ def reported_as_compliant?(xml_data)
         puts "  Details: #{url}##{url_anchor}"
         puts
       end
-      validation_result.attribute('isCompliant').content == 'true'
+      xml_doc.elements.to_a('/processorResult/validationResult').first.attributes['isCompliant'] == 'true'
     end
   end
 end