Module: CommandSearch::Postgres

Defined in:
lib/command_search/backends/postgres.rb

Class Method Summary collapse

Class Method Details

.build_query(ast) ⇒ Object 



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# File 'lib/command_search/backends/postgres.rb', line 85

def build_query(ast)
  out = []
  ast = [ast] unless ast.is_a?(Array)
  ast.each do |node|
    type = node[:type]
    if type == :colon
      out.push(command_search(node))
    elsif type == :compare
      out.push(compare_search(node))
    elsif type == :and
      out.push(build_query(node[:value]))
    elsif type == :or
      clauses = node[:value].map { |x| build_query(x) }
      clause = clauses.join(' OR ')
      out.push("(#{clause})")
    elsif type == :not
      clause = build_query(node[:value])
      out.push("NOT (#{clause})")
    end
  end
  out.join(' AND ')
end

.build_quoted_regex(input) ⇒ Object 



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# File 'lib/command_search/backends/postgres.rb', line 10

def build_quoted_regex(input)
  str = quote_string(input)
  str = Regexp.escape(str)
  if str[/(^\W)|(\W$)/]
    head_border = '(^|[^:+\w])'
    tail_border = '($|[^:+\w])'
    return head_border + str + tail_border
  end
  '\m' + str + '\y'
end

.command_search(node) ⇒ Object 



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# File 'lib/command_search/backends/postgres.rb', line 21

def command_search(node)
  field_node = node[:value].first
  field = field_node[:value]
  search_node = node[:value].last
  val = search_node[:value]
  type = search_node[:type]
  return '0 = 1' if field == '__CommandSearch_dummy_key__'
  if type == Boolean || type == :existence
    false_val = "'f'"
    false_val = 0 if field_node[:field_type] == Numeric
    if val
      return "NOT ((#{field} = #{false_val}) OR (#{field} IS NULL))"
    end
    return "((#{field} = #{false_val}) OR (#{field} IS NULL))"
  end
  if type == Time
    return '0 = 1' unless val
    return "
      (
        (#{field} >= '#{val[0]}') AND
        (#{field} < '#{val[1]}') AND
        (#{field} IS NOT NULL)
      )
    "
  end
  if type == :quote
    op = '~'
    val = "'#{build_quoted_regex(val)}'"
  elsif type == :str
    op = '~~*'
    val = quote_string(val)
    val.gsub!('%', '\%')
    val.gsub!('_', '\_')
    val = "'%#{val}%'"
  elsif type == :number
    op = '='
  end
  "(#{field} #{op} #{val}) AND (#{field} IS NOT NULL)"
end

.compare_search(node) ⇒ Object 



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# File 'lib/command_search/backends/postgres.rb', line 61

def compare_search(node)
  field_node = node[:value].first
  field = field_node[:value]
  search_node = node[:value].last
  val = search_node[:value]
  type = search_node[:type]
  op = node[:nest_op]
  if node[:compare_across_fields]
    "
      (
        (#{field} #{op} #{val}) AND
        (#{field} IS NOT NULL) AND
        (#{val} IS NOT NULL)
      )
    "
  elsif type == Time && val
    "(#{field} #{op} '#{val}') AND (#{field} IS NOT NULL)"
  elsif val.is_a?(Numeric) || val == val.to_i.to_s || val == val.to_f.to_s
    "(#{field} #{op} #{val}) AND (#{field} IS NOT NULL)"
  else
    '0 = 1'
  end
end

.quote_string(str) ⇒ Object 



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# File 'lib/command_search/backends/postgres.rb', line 5

def quote_string(str)
  # activerecord/lib/active_record/connection_adapters/abstract/quoting.rb:62
  str.gsub('\\', '\&\&').gsub("'", "''")
end