Class: Spectre::Operators::Intersection

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

Overview

Matches if both Nodes it receives as parameters match from the current position. Goes to the position in the input stream returned by the Node that matched the bigger input. Intersection.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 156

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

#scan(iter) ⇒ Object 



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# File 'lib/spectre/base/operators.rb', line 137

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

    second = @node.right.parse iter
    siter = iter.dup
    backtrack iter

    if first and second
        max = [[first,fiter], [second,siter]].max_by { |x| x[0].length }
        iter.to max[1].pos
        create_match iter, max[0]
    else
        nil
    end
end