gistfile1.txt

input: testabc:abc AND x:'test abc' OR y:123 AND testing123:'something else'

                  expression
                      / \
                  or     <nil>
                /  \________________
              and                   \ 
             / \                    and
  testabc:abc  x:'test abc'         / \
                                 y:123  testing123:'something else'

#<ExpressionNode:0x007f910791fec0
 @left=
  #<OrNode:0x007f910791ff10
   @left=
    #<AndNode:0x007f9107914958
     @left=#<TermNode:0x007f9107917338 @left="testabc", @right="abc">,
     @right=#<TermNode:0x007f91079149a8 @left="x", @right="'test abc'">>,
   @right=
    #<AndNode:0x007f910791ff60
     @left=#<TermNode:0x007f910791a0d8 @left="y", @right="123">,
     @right=
      #<TermNode:0x007f910791ffb0
       @left="testing123",
       @right="'something else'">>>,
 @right=nil>