Class: SqlBeautifier::DeleteQuery

Inherits:
Base
  • Object
show all
Includes:
DmlRendering
Defined in:
lib/sql_beautifier/delete_query.rb

Constant Summary collapse

CLAUSE_KEYWORDS = 
%w[using where returning].freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.parse(normalized_sql, depth: 0) ⇒ Object 



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# File 'lib/sql_beautifier/delete_query.rb', line 16

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

  scanner.skip_past_keyword!("delete")

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

  scanner.skip_past_keyword!("from")
  return nil if scanner.keyword_at?("only")

  table_name = scanner.read_identifier!
  return nil unless table_name

  scanner.skip_whitespace!

  table_alias = parse_table_alias(scanner)

  remaining_text = normalized_sql[scanner.position..].strip
  if remaining_text.present?
    remaining_scanner = Scanner.new(remaining_text)
    return nil unless CLAUSE_KEYWORDS.any? { |keyword| remaining_scanner.keyword_at?(keyword) }
  end

  clauses = split_delete_clauses(normalized_sql, scanner.position)

  new(
    table_name: table_name,
    table_alias: table_alias,
    using_clause: clauses[:using_clause],
    where_clause: clauses[:where_clause],
    returning_clause: clauses[:returning_clause],
    depth: depth
  )
end

Instance Method Details

#render ⇒ Object 



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# File 'lib/sql_beautifier/delete_query.rb', line 52

def render
  output = +""
  output << render_delete
  output << render_from
  output << render_using if @using_clause
  output << render_where if @where_clause
  output << render_returning if @returning_clause

  "#{output}\n"
end