Class: OptParseSimple

Inherits:
Object
  • Object
show all
Includes:
REXML
Defined in:
lib/optparse-simple.rb

Instance Method Summary collapse

Constructor Details

#initialize(s) ⇒ OptParseSimple

Returns a new instance of OptParseSimple.



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# File 'lib/optparse-simple.rb', line 13

def initialize(s)    
  super()
  
  buffer = read(s)    
  @doc = Document.new(buffer)    
  
end

Instance Method Details

#help ⇒ Object 



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# File 'lib/optparse-simple.rb', line 82

def help    
  a = XPath.match(@doc.root,  "records/optionx/summary[switch != 'n/a']").map do |summary|
    %w(switch alias).map {|x| summary.text x}
  end
  puts 'options:'
  puts TableFormatter.new(source: a, border: false).to_s
end

#parse(args) ⇒ Object 



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# File 'lib/optparse-simple.rb', line 21

def parse(args)
  
  @options = XPath.match(@doc.root, 'records/optionx[summary/switch!="n/a"]')

  switches = @options.map do |option| 
    switch = option.text('summary/switch')
    switch[0] == '-' ? switch : nil
  end    

  switches.compact!

  # split the argument switches if grouped e.g. -ltr
  args.map! do |arg|

    if arg[/^\-[a-zA-Z]+$/] and switches.grep(/#{arg}/).empty? then
      arg[1..-1].scan(/./).map {|x| '-' + x} 
    else
      arg
    end
  end

  args.flatten!

  # -- bind any loose value to their argument
  xpath = 'records/optionx/summary[switch != "n/a" and value != "n/a"]'
  options = XPath.match(@doc.root, xpath)\
      .map {|node|  %w(switch alias)\
        .map{|x| node.text(x)}.compact}\
      .flatten
  args.map!.with_index do |x,i|
    next unless x or i < args.length - 1
    (x += '=' + args[i+1]; args[i+1] = nil) if options.include?(x)
    x
  end
  args.compact!        
  # -- end of bind any loose value to their argument

  a1 = []
  a1 = options_match(@options[0], args).flatten.each_slice(2).map {|x| x if x[0]}.compact unless @options.empty?
  options_remaining = XPath.match(@doc.root, 'records/optionx/summary[switch="n/a"]/name/text()').map(&:to_s)
  mandatory_remaining  = XPath.match(@doc.root, 'records/optionx/summary[switch="n/a" and mandatory="true"]/name/text()').map(&:to_s)
  if mandatory_remaining.length > args.length then
     missing_arg = (mandatory_remaining - args).first
     option = XPath.first(@doc.root, "records/optionx[summary/name='#{missing_arg}']")
     raise option.text('records/errorx/summary/msg')
  end
  
  a2 = args.zip(options_remaining).map(&:reverse)
  if a2.map(&:first).all? then
    @h = Hash[*(a1+a2).map{|x,y| [x.to_s.strip.to_sym, y]}.flatten]
  else
    invalid_option = a2.detect {|x,y| x.nil? }.last
    raise "invalid option: %s not recognised" % invalid_option
  end
  @h
end

#to_h ⇒ Object 



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# File 'lib/optparse-simple.rb', line 78

def to_h()
  @h
end