Class: Radius::Scanner

Inherits:
Object
  • Object
show all
Defined in:
lib/radius/parser/scanner.rb

Direct Known Subclasses

SquiggleScanner

Instance Method Summary collapse

Instance Method Details

#operate(prefix, data) ⇒ Object

Parses a given string and returns an array of nodes. The nodes consist of strings and hashes that describe a Radius tag that was found.


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# File 'lib/radius/parser/scanner.rb', line 12

def operate(prefix, data)
  data = Radius::OrdString.new data
  @nodes = ['']
  
  re = scanner_regex(prefix)
  if md = re.match(data)      
    remainder = ''  
    while md
      start_tag, attributes, self_enclosed, end_tag = $1, $2, $3, $4

      flavor = self_enclosed == '/' ? :self : (start_tag ? :open : :close)
      
      # save the part before the current match as a string node
      @nodes << md.pre_match
      
      # save the tag that was found as a tag hash node
      @nodes << {:prefix=>prefix, :name=>(start_tag || end_tag), :flavor => flavor, :attrs => parse_attributes(attributes)}
      
      # remember the part after the current match
      remainder = md.post_match
      
      # see if we find another tag in the remaining string
      md = re.match(md.post_match)
    end  
    
    # add the last remaining string after the last tag that was found as a string node
    @nodes << remainder
  else
    @nodes << data
  end

  return @nodes
end

#scanner_regex(prefix = nil) ⇒ Object

The regular expression used to find (1) opening and self-enclosed tag names, (2) self-enclosing trailing slash, (3) attributes and (4) closing tag


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# File 'lib/radius/parser/scanner.rb', line 6

def scanner_regex(prefix = nil)
  %r{<#{prefix}:([-\w:]+?)(\s+(?:\w+\s*=\s*(?:"[^"]*?"|'[^']*?')\s*)*|)(\/?)>|<\/#{prefix}:([-\w:]+?)\s*>}
end