Class: XmlSimple

Inherits:
Object
  • Object
show all
Includes:
REXML
Defined in:
lib/xmlsimple.rb

Overview

Easy API to maintain XML (especially configuration files).

Defined Under Namespace

Classes: Cache

Constant Summary collapse

@@VERSION = 
'1.1.9'
@@cache =

Create a “global” cache.

Cache.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(defaults = nil) ⇒ XmlSimple

Creates and initializes a new XmlSimple object.

defaults

Default values for options.



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# File 'lib/xmlsimple.rb', line 128

def initialize(defaults = nil)
  unless defaults.nil? || defaults.is_a?(Hash)
    raise ArgumentError, "Options have to be a Hash."
  end
  @default_options = normalize_option_names(defaults, (KNOWN_OPTIONS['in'] + KNOWN_OPTIONS['out']).uniq)
  @options = Hash.new
  @_var_values = nil
end

Class Method Details

.xml_in(string = nil, options = nil) ⇒ Object

This is the functional version of the instance method xml_in.



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# File 'lib/xmlsimple.rb', line 201

def XmlSimple.xml_in(string = nil, options = nil)
  xml_simple = XmlSimple.new
  xml_simple.xml_in(string, options)
end

.xml_out(hash, options = nil) ⇒ Object

This is the functional version of the instance method xml_out.



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# File 'lib/xmlsimple.rb', line 257

def XmlSimple.xml_out(hash, options = nil)
  xml_simple = XmlSimple.new
  xml_simple.xml_out(hash, options)
end

Instance Method Details

#xml_in(string = nil, options = nil) ⇒ Object

Converts an XML document in the same way as the Perl module XML::Simple.

string

XML source. Could be one of the following:

  • nil: Tries to load and parse ‘<scriptname>.xml’.

  • filename: Tries to load and parse filename.

  • IO object: Reads from object until EOF is detected and parses result.

  • XML string: Parses string.

options

Options to be used.



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# File 'lib/xmlsimple.rb', line 149

def xml_in(string = nil, options = nil)
  handle_options('in', options)

  # If no XML string or filename was supplied look for scriptname.xml.
  if string.nil?
    string = File::basename($0).dup
    string.sub!(/\.[^.]+$/, '')
    string += '.xml'

    directory = File::dirname($0)
    @options['searchpath'].unshift(directory) unless directory.nil?
  end

  if string.is_a?(String)
    if string =~ /<.*?>/m
      @doc = parse(string)
    elsif string == '-'
      @doc = parse($stdin.read)
    else
      filename = find_xml_file(string, @options['searchpath'])

      if @options.has_key?('cache')
        @options['cache'].each { |scheme|
          case(scheme)
          when 'storable'
            content = @@cache.restore_storable(filename)
          when 'mem_share'
            content = @@cache.restore_mem_share(filename)
          when 'mem_copy'
            content = @@cache.restore_mem_copy(filename)
          else
            raise ArgumentError, "Unsupported caching scheme: <#{scheme}>."
          end
          return content if content
        }
      end

      @doc = load_xml_file(filename)
    end
  elsif string.respond_to?(:read)
    @doc = parse(string.read)
  else
    raise ArgumentError, "Could not parse object of type: <#{string.class}>."
  end

  result = collapse(@doc.root)
  result = @options['keeproot'] ? merge({}, @doc.root.name, result) : result
  put_into_cache(result, filename)
  result
end

#xml_out(ref, options = nil) ⇒ Object

Converts a data structure into an XML document.

ref

Reference to data structure to be converted into XML.

options

Options to be used.



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# File 'lib/xmlsimple.rb', line 212

def xml_out(ref, options = nil)
  handle_options('out', options)
  if ref.is_a?(Array)
    ref = { @options['anonymoustag'] => ref }
  end

  if @options['keeproot']
    keys = ref.keys
    if keys.size == 1
      ref = ref[keys[0]]
      @options['rootname'] = keys[0]
    end
  elsif @options['rootname'] == ''
    if ref.is_a?(Hash)
      refsave = ref
      ref = {}
      refsave.each { |key, value|
        if !scalar(value)
          ref[key] = value
        else
          ref[key] = [ value.to_s ]
        end
      }
    end
  end

  @ancestors = []
  xml = value_to_xml(ref, @options['rootname'], '')
  @ancestors = nil

  if @options['xmldeclaration']
    xml = @options['xmldeclaration'] + "\n" + xml
  end

  if @options.has_key?('outputfile')
    if @options['outputfile'].kind_of?(IO)
      return @options['outputfile'].write(xml)
    else
      File.open(@options['outputfile'], "w") { |file| file.write(xml) }
    end
  end
  xml
end