Class: SqlBeautifier::CteQuery

Inherits:
Base
  • Object
show all
Defined in:
lib/sql_beautifier/cte_query.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.parse(normalized_sql, depth: 0) ⇒ Object 



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
 
# File 'lib/sql_beautifier/cte_query.rb', line 10

def self.parse(normalized_sql, depth: 0)
  scanner = Scanner.new(normalized_sql)
  return nil unless scanner.keyword_at?("with")

  scanner.skip_past_keyword!("with")

  recursive = scanner.keyword_at?("recursive")
  scanner.skip_past_keyword!("recursive") if recursive

  definitions = []

  loop do
    definition, new_position = parse_raw_definition(normalized_sql, scanner.position)
    break unless definition

    definitions << CteDefinition.new(**definition)
    scanner.advance!(new_position - scanner.position)
    scanner.skip_whitespace!

    break unless scanner.position < normalized_sql.length && scanner.current_char == Constants::COMMA

    scanner.advance!
    scanner.skip_whitespace!
  end

  main_query_sql = normalized_sql[scanner.position..].strip
  return nil unless definitions.any? && main_query_sql.present?

  new(recursive: recursive, definitions: definitions, main_query_sql: main_query_sql, depth: depth)
end

.parse_column_list(sql, position) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/sql_beautifier/cte_query.rb', line 71

def self.parse_column_list(sql, position)
  return nil unless position < sql.length && sql[position] == Constants::OPEN_PARENTHESIS

  scanner = Scanner.new(sql)
  closing = scanner.find_matching_parenthesis(position)
  return nil unless closing

  after_paren_scanner = Scanner.new(sql, position: closing + 1)
  after_paren_scanner.skip_whitespace!
  return nil unless after_paren_scanner.keyword_at?("as")

  { text: sql[(position + 1)...closing].strip, next_position: after_paren_scanner.position }
end

.parse_materialization(sql, position) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
 
# File 'lib/sql_beautifier/cte_query.rb', line 85

def self.parse_materialization(sql, position)
  scanner = Scanner.new(sql, position: position)
  scanner.skip_whitespace!

  if scanner.keyword_at?("materialized")
    scanner.skip_past_keyword!("materialized")
    return ["materialized", scanner.position]
  end

  return [nil, scanner.position] unless scanner.keyword_at?("not")

  scanner.skip_past_keyword!("not")

  return [nil, position] unless scanner.keyword_at?("materialized")

  scanner.skip_past_keyword!("materialized")
  ["not materialized", scanner.position]
end

.parse_raw_definition(sql, position) ⇒ Object 



41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/sql_beautifier/cte_query.rb', line 41

def self.parse_raw_definition(sql, position)
  scanner = Scanner.new(sql, position: position)

  name = scanner.read_identifier!
  return nil unless name

  scanner.skip_whitespace!

  column_list = parse_column_list(sql, scanner.position)
  scanner.advance!(column_list[:next_position] - scanner.position) if column_list

  return nil unless scanner.keyword_at?("as")

  scanner.skip_past_keyword!("as")
  materialization, materialization_end_position = parse_materialization(sql, scanner.position)
  scanner.advance!(materialization_end_position - scanner.position)

  return nil unless scanner.position < sql.length && scanner.current_char == Constants::OPEN_PARENTHESIS

  closing = scanner.find_matching_parenthesis(scanner.position)
  return nil unless closing

  body_sql = sql[(scanner.position + 1)...closing].strip
  result = { name: name, body_sql: body_sql }
  result[:column_list] = column_list[:text] if column_list
  result[:materialization] = materialization if materialization

  [result, closing + 1]
end

Instance Method Details

#render ⇒ Object 



104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
 
# File 'lib/sql_beautifier/cte_query.rb', line 104

def render
  output = +""

  @definitions.each_with_index do |definition, index|
    if index.zero?
      output << "#{Util.format_keyword('with')} "
      output << "#{Util.format_keyword('recursive')} " if @recursive
    end

    output << definition.render_header
    output << definition.render_body(0)
    output << (index < @definitions.length - 1 ? ",\n" : "\n\n")
  end

  formatted_main = Formatter.new(@main_query_sql, depth: @depth).call
  output << formatted_main if formatted_main

  output
end