Class: Libis::Format::Converter::XsltConverter

Inherits:
Base
  • Object
show all
Defined in:
lib/libis/format/converter/xslt_converter.rb

Instance Attribute Summary

Attributes inherited from Base

#flags, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

category, #check_file_exist, inherited, #initialize, #using_temp, using_temp

Constructor Details

This class inherits a constructor from Libis::Format::Converter::Base

Class Method Details

.input_types ⇒ Object 



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# File 'lib/libis/format/converter/xslt_converter.rb', line 9

def self.input_types
  [:XML]
end

.output_types(format = nil) ⇒ Object 



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# File 'lib/libis/format/converter/xslt_converter.rb', line 13

def self.output_types(format = nil)
  return [] unless input_types.include?(format) if format
  [:XML, :HTML, :TXT]
end

Instance Method Details

#convert(source, target, _format, opts = {}) ⇒ Object 



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# File 'lib/libis/format/converter/xslt_converter.rb', line 22

def convert(source, target, _format, opts = {})
  super

  unless File.file?(source) && File.exist?(source) && File.readable?(source)
    error "File '#{source}' does not exist or is not readable"
    return nil
  end

  unless @options[:xsl_file]
    error 'No xsl_file supplied'
    return nil
  end

  FileUtils.mkpath(File.dirname(target))

  if RUBY_PLATFORM == "java"
    require 'saxon-xslt'
    xsl = Saxon.XSLT(File.open(@options[:xsl_file]))
    xml = Saxon.XML(File.open(source))
    result = xsl.transform(xml)
    File.open(target, 'w') {|f| f.write(result.to_s)}
  else
    require 'nokogiri'

    doc = nil
    begin
      doc = Nokogiri::XML(File.read(source)) do |config|
        config.options = Nokogiri::XML::ParseOptions::STRICT | Nokogiri::XML::ParseOptions::NOBLANKS
      end
    rescue Nokogiri::XML::SyntaxError => e
      if e.fatal? || e.error?
        error "Error parsing XML input '#{source}': #{e.messsage} @ #{e.backtrace[0]}"
        return nil
      end
    end

    file = @options[:xsl_file]

    unless File.file?(file) && File.exist?(file) && File.readable?(file)
      error "XSL file '#{@options[:xsl_file]}' does not exist or is not readable"
      return nil
    end

    xsl = nil

    begin
      fp = File.open(file, 'r')
      xsl = Nokogiri::XSLT(fp) do |config|
        config.options = Nokogiri::XML::ParseOptions::STRICT | Nokogiri::XML::ParseOptions::NOBLANKS
      end
    rescue Nokogiri::XML::SyntaxError => e
      if e.fatal? || e.error?
        error "Error parsing XSL input '#{file}': #{e.message} @ #{e.backtrace[0]}"
        return nil
      end
    ensure
      fp.close
    end

    begin
      target_xml = xsl.transform(doc)
      fp = File.open(target, 'w')
      fp.write(target_xml)
    rescue Exception => e
      error "Error transforming '#{source}' with '#{file}': #{e.message} @ #{e.backtrace[0]}"
      return nil
    ensure
      fp.close unless fp.nil? or fp.closed?
    end

    target
  end

end

#xsl_file(file_path) ⇒ Object 



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# File 'lib/libis/format/converter/xslt_converter.rb', line 18

def xsl_file(file_path)
  @options[:xsl_file] = file_path
end