Class | Sequel::Postgres::PGRange::Parser |
In: |
lib/sequel/extensions/pg_range.rb
|
Parent: | Object |
PARSER | = | /\A(\[|\()("((?:\\"|[^"])*)"|[^"]*),("((?:\\"|[^"])*)"|[^"]*)(\]|\))\z/o | Regexp that parses the full range of PostgreSQL range type output, except for empty ranges. | |
REPLACE_RE | = | /\\(.)/.freeze | ||
REPLACE_WITH | = | '\1'.freeze |
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 143 143: def initialize(db_type, converter=nil) 144: @db_type = db_type.to_s.dup.freeze if db_type 145: @converter = converter 146: end
Parse the range type input string into a PGRange value.
# File lib/sequel/extensions/pg_range.rb, line 149 149: def call(string) 150: if string == EMPTY 151: return PGRange.empty(db_type) 152: end 153: 154: raise(InvalidValue, "invalid or unhandled range format: #{string.inspect}") unless matches = PARSER.match(string) 155: 156: exclude_begin = matches[1] == '(' 157: exclude_end = matches[6] == ')' 158: 159: # If the input is quoted, it needs to be unescaped. Also, quoted input isn't 160: # checked for emptiness, since the empty quoted string is considered an 161: # element that happens to be the empty string, while an unquoted empty string 162: # is considered unbounded. 163: # 164: # While PostgreSQL allows pure escaping for input (without quoting), it appears 165: # to always use the quoted output form when characters need to be escaped, so 166: # there isn't a need to unescape unquoted output. 167: if beg = matches[3] 168: beg.gsub!(REPLACE_RE, REPLACE_WITH) 169: else 170: beg = matches[2] unless matches[2].empty? 171: end 172: if en = matches[5] 173: en.gsub!(REPLACE_RE, REPLACE_WITH) 174: else 175: en = matches[4] unless matches[4].empty? 176: end 177: 178: if c = converter 179: beg = c.call(beg) if beg 180: en = c.call(en) if en 181: end 182: 183: PGRange.new(beg, en, :exclude_begin=>exclude_begin, :exclude_end=>exclude_end, :db_type=>db_type) 184: end