class Sequel::ASTTransformer

   # File lib/sequel/ast_transformer.rb
11 def transform(obj)
12   v(obj)
13 end

   # File lib/sequel/ast_transformer.rb
19 def v(o)
20   case o
21   when Symbol, Numeric, String, Class, TrueClass, FalseClass, NilClass
22     o
23   when Array
24     o.map{|x| v(x)}
25   when Hash
26     h = {}
27     o.each{|k, val| h[v(k)] = v(val)}
28     h
29   when Set
30     Set.new(o.map{|x| v(x)})
31   when SQL::NumericExpression
32     if o.op == :extract
33       o.class.new(o.op, o.args[0], v(o.args[1]))
34     else
35       o.class.new(o.op, *v(o.args))
36     end
37   when SQL::ComplexExpression
38     o.class.new(o.op, *v(o.args))
39   when SQL::Identifier
40     SQL::Identifier.new(v(o.value))
41   when SQL::QualifiedIdentifier
42     SQL::QualifiedIdentifier.new(v(o.table), v(o.column))
43   when SQL::OrderedExpression
44     SQL::OrderedExpression.new(v(o.expression), o.descending, :nulls=>o.nulls)
45   when SQL::AliasedExpression
46     SQL::AliasedExpression.new(v(o.expression), o.alias, o.columns)
47   when SQL::CaseExpression
48     args = [v(o.conditions), v(o.default)]
49     args << v(o.expression) if o.expression?
50     SQL::CaseExpression.new(*args)
51   when SQL::Cast
52     SQL::Cast.new(v(o.expr), o.type)
53   when SQL::Function
54     h = {}
55     o.opts.each do |k, val|
56       h[k] = v(val)
57     end
58     SQL::Function.new!(o.name, v(o.args), h)
59   when SQL::Subscript
60     SQL::Subscript.new(v(o.expression), v(o.sub))
61   when SQL::Window
62     opts = o.opts.dup
63     opts[:partition] = v(opts[:partition]) if opts[:partition]
64     opts[:order] = v(opts[:order]) if opts[:order]
65     SQL::Window.new(opts)
66   when SQL::PlaceholderLiteralString
67     args = if o.args.is_a?(Hash)
68       h = {}
69       o.args.each{|k,val| h[k] = v(val)}
70       h
71     else
72       v(o.args)
73     end
74     SQL::PlaceholderLiteralString.new(o.str, args, o.parens)
75   when SQL::JoinOnClause
76     SQL::JoinOnClause.new(v(o.on), o.join_type, v(o.table_expr))
77   when SQL::JoinUsingClause
78     SQL::JoinUsingClause.new(v(o.using), o.join_type, v(o.table_expr))
79   when SQL::JoinClause
80     SQL::JoinClause.new(o.join_type, v(o.table_expr))
81   when SQL::DelayedEvaluation
82     SQL::DelayedEvaluation.new(lambda{|ds| v(o.call(ds))})
83   when SQL::Wrapper
84     SQL::Wrapper.new(v(o.value))
85   when SQL::Expression
86     if o.respond_to?(:sequel_ast_transform)
87       o.sequel_ast_transform(method(:v))
88     else
89       o
90     end
91   else
92     o
93   end
94 end