Class Sequel::Postgres::PGRange::Parser
In: lib/sequel/extensions/pg_range.rb
Parent: Object

Creates callable objects that convert strings into PGRange instances.

Methods

call   new  

Constants

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

Attributes

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.

Public Class methods

new(db_type, converter=nil)

Set the db_type and converter on initialization.

[Source]

     # File lib/sequel/extensions/pg_range.rb, line 140
140:         def initialize(db_type, converter=nil)
141:           @db_type = db_type.to_s.dup.freeze if db_type
142:           @converter = converter
143:         end

Public Instance methods

call(string)

Parse the range type input string into a PGRange value.

[Source]

     # File lib/sequel/extensions/pg_range.rb, line 146
146:         def call(string)
147:           if string == EMPTY
148:             return PGRange.empty(db_type)
149:           end
150: 
151:           raise(InvalidValue, "invalid or unhandled range format: #{string.inspect}") unless matches = PARSER.match(string)
152: 
153:           exclude_begin = matches[1] == '('
154:           exclude_end = matches[6] == ')'
155: 
156:           # If the input is quoted, it needs to be unescaped.  Also, quoted input isn't
157:           # checked for emptiness, since the empty quoted string is considered an 
158:           # element that happens to be the empty string, while an unquoted empty string
159:           # is considered unbounded.
160:           #
161:           # While PostgreSQL allows pure escaping for input (without quoting), it appears
162:           # to always use the quoted output form when characters need to be escaped, so
163:           # there isn't a need to unescape unquoted output.
164:           if beg = matches[3]
165:             beg.gsub!(REPLACE_RE, REPLACE_WITH)
166:           else
167:             beg = matches[2] unless matches[2].empty?
168:           end
169:           if en = matches[5]
170:             en.gsub!(REPLACE_RE, REPLACE_WITH)
171:           else
172:             en = matches[4] unless matches[4].empty?
173:           end
174: 
175:           if c = converter
176:             beg = c.call(beg) if beg
177:             en = c.call(en) if en
178:           end
179: 
180:           PGRange.new(beg, en, :exclude_begin=>exclude_begin, :exclude_end=>exclude_end, :db_type=>db_type)
181:         end

[Validate]