1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
# frozen_string_literal: true
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
|
