Class: GenX::Builder

Inherits:
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  • Object
show all
Defined in:
lib/genx4r/builder.rb

Instance Method Summary collapse

Constructor Details

#initialize(writer) ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/genx4r/builder.rb', line 13

def initialize(writer)
  @writer = writer

  @elements   = {}
  @attributes = {}
  @namespaces = {}

  @indent = 2
  @level  = 0
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 24

def method_missing(sym, *args, &block)
  text  = nil
  attrs = nil

  args.each do |arg|
    case arg
    when Hash
      attrs ||= {}
      attrs.merge!(arg)
    else
      text ||= ''
      text << arg.to_s
    end
  end

  _cache_element(sym)
  _cache_attrs(attrs) unless attrs.nil?

  if block
    raise ArgumentError, 'can\'t have both text and block' unless text.nil?
    _indent
    @writer.element(@elements[sym]) do
      _write_attrs(attrs) unless attrs.nil?
      _write_contents(block)
    end
    _newline
  else
    _indent
    @writer.element(@elements[sym]) do
      _write_attrs(attrs) unless attrs.nil?
      @writer.text(text)  unless text.nil?
    end
    _newline
  end
end

Instance Method Details

#_begin_doc(io) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 103

def _begin_doc(io)
  @writer.begin_document(io)
end

#_cache_attrs(attrs) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 77

def _cache_attrs(attrs)
  attrs.each_key do |attr|
    unless @attributes.has_key?(attr)
      @attributes[attr] = @writer.declare_attribute(attr.to_s)
    end
  end
end

#_cache_element(sym) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 85

def _cache_element(sym)
  unless @elements.has_key?(sym.to_s)
    @elements[sym] = @writer.declare_element(sym.to_s)
  end
end

#_end_doc ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 107

def _end_doc
  @writer.end_document
end

#_indent ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 97

def _indent
  unless @indent == 0 || @level == 0
    @writer.text(" " * (@indent * @level))
  end
end

#_newline ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 91

def _newline
  unless @indent == 0 || @level == 0
    @writer.text("\n")
  end
end

#_write_attrs(attrs) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 71

def _write_attrs(attrs)
  attrs.each_key do |attr|
    @writer.attribute(@attributes[attr], attrs[attr])
  end
end

#_write_contents(block) ⇒ Object 



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# File 'lib/genx4r/builder.rb', line 60

def _write_contents(block)
  begin
    @level += 1
    _newline
    block.call(self)
  ensure
    @level -= 1
    _indent
  end
end