Class | Sequel::Postgres::PGRange::Parser |
In: |
lib/sequel/extensions/pg_range.rb
|
Parent: | Object |
converter | [R] | A callable object to convert the beginning and ending of the range into the appropriate ruby type. |
db_type | [R] | The database range type for this parser (e.g. ‘int4range’), automatically setting the db_type for the returned PGRange instances. |
Set the db_type and converter on initialization.
# File lib/sequel/extensions/pg_range.rb, line 89 89: def initialize(db_type, converter=nil) 90: @db_type = db_type.to_s.dup.freeze if db_type 91: @converter = converter 92: end
Parse the range type input string into a PGRange value.
# File lib/sequel/extensions/pg_range.rb, line 95 95: def call(string) 96: if string == 'empty' 97: return PGRange.empty(db_type) 98: end 99: 100: raise(InvalidValue, "invalid or unhandled range format: #{string.inspect}") unless matches = /\A(\[|\()("((?:\\"|[^"])*)"|[^"]*),("((?:\\"|[^"])*)"|[^"]*)(\]|\))\z/.match(string) 101: 102: exclude_begin = matches[1] == '(' 103: exclude_end = matches[6] == ')' 104: 105: # If the input is quoted, it needs to be unescaped. Also, quoted input isn't 106: # checked for emptiness, since the empty quoted string is considered an 107: # element that happens to be the empty string, while an unquoted empty string 108: # is considered unbounded. 109: # 110: # While PostgreSQL allows pure escaping for input (without quoting), it appears 111: # to always use the quoted output form when characters need to be escaped, so 112: # there isn't a need to unescape unquoted output. 113: if beg = matches[3] 114: beg.gsub!(/\\(.)/, '\1') 115: else 116: beg = matches[2] unless matches[2].empty? 117: end 118: if en = matches[5] 119: en.gsub!(/\\(.)/, '\1') 120: else 121: en = matches[4] unless matches[4].empty? 122: end 123: 124: if c = converter 125: beg = c.call(beg) if beg 126: en = c.call(en) if en 127: end 128: 129: PGRange.new(beg, en, :exclude_begin=>exclude_begin, :exclude_end=>exclude_end, :db_type=>db_type) 130: end