blob: d2e6313dda192715bbf8715da461a65fb2488cde (
plain) (
blame)
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
|
# frozen_string_literal: true
module Arel
module Nodes
###
# Abstract base class for all AST nodes
class Node
include Arel::FactoryMethods
include Enumerable
if $DEBUG
def _caller
@caller
end
def initialize
@caller = caller.dup
end
end
###
# Factory method to create a Nodes::Not node that has the recipient of
# the caller as a child.
def not
Nodes::Not.new self
end
###
# Factory method to create a Nodes::Grouping node that has an Nodes::Or
# node as a child.
def or right
Nodes::Grouping.new Nodes::Or.new(self, right)
end
###
# Factory method to create an Nodes::And node.
def and right
Nodes::And.new [self, right]
end
# FIXME: this method should go away. I don't like people calling
# to_sql on non-head nodes. This forces us to walk the AST until we
# can find a node that has a "relation" member.
#
# Maybe we should just use `Table.engine`? :'(
def to_sql engine = Table.engine
collector = Arel::Collectors::SQLString.new
collector = engine.connection.visitor.accept self, collector
collector.value
end
# Iterate through AST, nodes will be yielded depth-first
def each &block
return enum_for(:each) unless block_given?
::Arel::Visitors::DepthFirst.new(block).accept self
end
end
end
end
|