Class: Inversion::Template::CodeTag::TokenPattern

Inherits:
Ripper::TokenPattern
  • Object
show all
Extended by:
Loggability
Defined in:
lib/inversion/template/codetag.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#source ⇒ Object (readonly)

Expose the source attribute



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# File 'lib/inversion/template/codetag.rb', line 50

def source
  @source
end

Instance Method Details

#compile(pattern) ⇒ Object

Overloaded to generate a bound regex.



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# File 'lib/inversion/template/codetag.rb', line 54

def compile( pattern )
  self.log.debug "Compiling token pattern from: %p" % [ pattern ]

  if m = /[^\w\s$()\[\]{}?*+\.]/.match( pattern )
    raise Ripper::TokenPattern::CompileError, "invalid char in pattern: #{m[0].inspect}"
  end

  buf = +'\\A'
  pattern.scan(/(?:\w+|\$\(|[()\[\]\{\}?*+\.]+)/) do |tok|
    case tok
    when /\w/
      buf.concat( map_token(tok) )
    when '$('
      buf.concat( '(' )
    when '('
      buf.concat( '(?:' )
    when /[?*\[\])\.]/
      buf.concat( tok )
    else
      raise 'must not happen'
    end
  end
  buf.concat( '\z' )

  self.log.debug "  resulting token pattern is: %p" % [ buf ]
  return Regexp.compile( buf )

rescue RegexpError => err
  raise Ripper::TokenPattern::CompileError, err.message
end