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Versions: 21
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Contents
module JMESPath
# @api private
module Nodes
class Subexpression < Node
def initialize(left, right)
@left = left
@right = right
end
def visit(value)
@right.visit(@left.visit(value))
end
def optimize
Chain.new(flatten).optimize
end
protected
attr_reader :left, :right
def flatten
nodes = [@left, @right]
until nodes.none? { |node| node.is_a?(Subexpression) }
nodes = nodes.flat_map do |node|
if node.is_a?(Subexpression)
[node.left, node.right]
else
[node]
end
end
end
nodes.map(&:optimize)
end
end
class Chain
def initialize(children)
@children = children
end
def visit(value)
@children.reduce(value) do |v, child|
child.visit(v)
end
end
def optimize
children = @children.map(&:optimize)
index = 0
while index < children.size - 1
if children[index].chains_with?(children[index + 1])
children[index] = children[index].chain(children[index + 1])
children.delete_at(index + 1)
else
index += 1
end
end
Chain.new(children)
end
end
end
end
Version data entries
21 entries across 21 versions & 3 rubygems