Class: Spectre::Operators::Difference

Inherits:
Object
  • Object
show all
Includes:
Op
Defined in:
lib/spectre/base/operators.rb

Overview

Matches if the first Node matches, but not the second or if both match and the first one’s match is longer. Difference.new p1, p2 is equal to p1 - p2.

Instance Attribute Summary

Attributes included from Parser

#node

Instance Method Summary collapse

Methods included from Op

#pre_skip?

Methods included from Parser

#backtrack, #create_match, from_POD, #pre_skip?, #to_p

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/spectre/base/operators.rb', line 186

def inspect
    '(' + @node.left.inspect + ' - ' + @node.right.inspect + ')'
end

#scan(iter) ⇒ Object 



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# File 'lib/spectre/base/operators.rb', line 169

def scan iter
    first = @node.left.parse iter
    fiter = iter.dup
    backtrack iter
    return nil unless first

    second = @node.right.parse iter
    backtrack iter

    if ( first and not second ) or ( first.length > second.length )
        iter.to fiter.pos
        create_match iter, first
    else
        nil
    end
end