/usr/lib/ruby/vendor_ruby/sequel/extensions/pg_array.rb is in ruby-sequel 3.36.1-1.
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# PostgreSQL's string and numeric array types. It supports both
# single and multi-dimensional arrays. For integer and
# float arrays, it uses a JSON-based parser which is usually written in C
# and should be fairly fast. For string and decimal arrays, it uses
# a hand coded parser written in ruby that is unoptimized and probably
# slow.
#
# This extension integrates with Sequel's native postgres adapter, so
# that when array fields are retrieved, they are parsed and returned
# as instances of Sequel::Postgres::PGArray subclasses. PGArray is
# a DelegateClass of Array, so it mostly acts like an array, but not
# completely (is_a?(Array) is false). If you want the actual array,
# you can call PGArray#to_a. This is done so that Sequel does not
# treat a PGArray like an Array by default, which would cause issues.
#
# In addition to the parsers, this extension comes with literalizers
# for PGArray using the standard Sequel literalization callbacks, so
# they work with on all adapters.
#
# To turn an existing Array into a PGArray:
#
# array.pg_array
#
# You can also provide a type, though it many cases it isn't necessary:
#
# array.pg_array(:varchar) # or :int4, :"double precision", etc.
#
# So if you want to insert an array into an int4[] database column:
#
# DB[:table].insert(:column=>[1, 2, 3].pg_array)
#
# If you would like to use PostgreSQL arrays in your model objects, you
# probably want to modify the schema parsing/typecasting so that it
# recognizes and correctly handles the arrays, which you can do by:
#
# DB.extend Sequel::Postgres::PGArray::DatabaseMethods
#
# If you are not using the native postgres adapter, you probably
# also want to use the typecast_on_load plugin in the model, and
# set it to typecast the array column(s) on load.
#
# If you want an easy way to call PostgreSQL array functions and
# operators, look into the pg_array_ops extension.
#
# This extension requires both the json and delegate libraries.
#
# == Additional License
#
# PGArray::Parser code was translated from Javascript code in the
# node-postgres project and has the following additional license:
#
# Copyright (c) 2010 Brian Carlson (brian.m.carlson@gmail.com)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject
# to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
require 'delegate'
require 'json'
module Sequel
module Postgres
# Base class for the PostgreSQL array types. Subclasses generally
# just deal with parsing, so instances manually created from arrays
# can use this class correctly.
class PGArray < DelegateClass(Array)
ARRAY = "ARRAY".freeze
DOUBLE_COLON = '::'.freeze
EMPTY_BRACKET = '[]'.freeze
OPEN_BRACKET = '['.freeze
CLOSE_BRACKET = ']'.freeze
COMMA = ','.freeze
BACKSLASH = '\\'.freeze
EMPTY_STRING = ''.freeze
OPEN_BRACE = '{'.freeze
CLOSE_BRACE = '}'.freeze
NULL = 'NULL'.freeze
QUOTE = '"'.freeze
module DatabaseMethods
ESCAPE_RE = /("|\\)/.freeze
ESCAPE_REPLACEMENT = '\\\\\1'.freeze
# Reset the conversion procs when extending the Database object, so
# it will pick up the array convertors. This is only done for the native
# postgres adapter.
def self.extended(db)
db.reset_conversion_procs if db.respond_to?(:reset_conversion_procs)
end
# Handle arrays in bound variables
def bound_variable_arg(arg, conn)
case arg
when PGArray
bound_variable_array(arg.to_a)
when Array
bound_variable_array(arg)
else
super
end
end
# Make the column type detection deal with string and numeric array types.
def schema_column_type(db_type)
case db_type
when /\A(character( varying)?|text).*\[\]\z/io
:string_array
when /\A(integer|bigint|smallint)\[\]\z/io
:integer_array
when /\A(real|double precision)\[\]\z/io
:float_array
when /\Anumeric.*\[\]\z/io
:decimal_array
else
super
end
end
private
# Format arrays used in bound variables.
def bound_variable_array(a)
case a
when Array
"{#{a.map{|i| bound_variable_array(i)}.join(COMMA)}}"
when String
"\"#{a.gsub(ESCAPE_RE, ESCAPE_REPLACEMENT)}\""
else
literal(a)
end
end
# Given a value to typecast and the type of PGArray subclass:
# * If given a PGArray, just return the value (even if different subclass)
# * If given an Array, create a new instance of the subclass
# * If given a String, call the parser for the subclass with it.
def typecast_value_pg_array(value, klass)
case value
when PGArray
value
when Array
klass.new(value)
when String
klass.parse(value)
else
raise Sequel::InvalidValue, "invalid value for #{klass}: #{value.inspect}"
end
end
# Create typecast methods for the supported array types that
# delegate to typecast_value_pg_array with the related class.
%w'string integer float decimal'.each do |t|
class_eval("def typecast_value_#{t}_array(v) typecast_value_pg_array(v, PG#{t.capitalize}Array) end", __FILE__, __LINE__)
end
end
# PostgreSQL array parser that handles both text and numeric
# input. Because PostgreSQL arrays can contain objects that
# can be literalized in any number of ways, it is not possible
# to make a fully generic parser.
#
# This parser is very simple and unoptimized, but should still
# be O(n) where n is the length of the input string.
class Parser
attr_reader :pos
# Set the source for the input, and any converter callable
# to call with objects to be created. For nested parsers
# the source may contain text after the end current parse,
# which will be ignored.
def initialize(source, converter=nil)
@source = source
@source_length = source.length
@converter = converter
@pos = -1
@entries = []
@recorded = ""
@dimension = 0
end
# Return 2 objects, whether the next character in the input
# was escaped with a backslash, and what the next character is.
def next_char
@pos += 1
if (c = @source[@pos..@pos]) == BACKSLASH
@pos += 1
[true, @source[@pos..@pos]]
else
[false, c]
end
end
# Add a new character to the buffer of recorded characters.
def record(c)
@recorded << c
end
# Take the buffer of recorded characters and add it to the array
# of entries, and use a new buffer for recorded characters.
def new_entry(include_empty=false)
if !@recorded.empty? || include_empty
entry = @recorded
if entry == NULL && !include_empty
entry = nil
elsif @converter
entry = @converter.call(entry)
end
@entries.push(entry)
@recorded = ""
end
end
# Parse the input character by character, returning an array
# of parsed (and potentially converted) objects.
def parse(nested=false)
# quote sets whether we are inside of a quoted string.
quote = false
until @pos >= @source_length
escaped, char = next_char
if char == OPEN_BRACE && !quote
@dimension += 1
if (@dimension > 1)
# Multi-dimensional array encounter, use a subparser
# to parse the next level down.
subparser = self.class.new(@source[@pos..-1], @converter)
@entries.push(subparser.parse(true))
@pos += subparser.pos - 1
end
elsif char == CLOSE_BRACE && !quote
@dimension -= 1
if (@dimension == 0)
new_entry
# Exit early if inside a subparser, since the
# text after parsing the current level should be
# ignored as it is handled by the parent parser.
return @entries if nested
end
elsif char == QUOTE && !escaped
# If already inside the quoted string, this is the
# ending quote, so add the entry. Otherwise, this
# is the opening quote, so set the quote flag.
new_entry(true) if quote
quote = !quote
elsif char == COMMA && !quote
# If not inside a string and a comma occurs, it indicates
# the end of the entry, so add the entry.
new_entry
else
# Add the character to the recorded character buffer.
record(char)
end
end
raise Sequel::Error, "array dimensions not balanced" unless @dimension == 0
@entries
end
end
# Parse the string using the generalized parser, setting the type
# if given.
def self.parse(string, type=nil)
new(Parser.new(string, method(:convert_item)).parse, type)
end
# Return the item as-is by default, making conversion a no-op.
def self.convert_item(s)
s
end
private_class_method :convert_item
# The type of this array. May be nil if no type was given. If a type
# is provided, the array is automatically casted to this type when
# literalizing. This type is the underlying type, not the array type
# itself, so for an int4[] database type, it should be :int4 or 'int4'
attr_accessor :array_type
# Set the array to delegate to, and a database type.
def initialize(array, type=nil)
super(array)
self.array_type = type
end
# The delegated object is always an array.
alias to_a __getobj__
# Append the array SQL to the given sql string.
# If the receiver has a type, add a cast to the
# database array type.
def sql_literal_append(ds, sql)
sql << ARRAY
_literal_append(sql, ds, to_a)
if at = array_type
sql << DOUBLE_COLON << at.to_s << EMPTY_BRACKET
end
end
private
# Recursive method that handles multi-dimensional
# arrays, surrounding each with [] and interspersing
# entries with ,.
def _literal_append(sql, ds, array)
sql << OPEN_BRACKET
comma = false
commas = COMMA
array.each do |i|
sql << commas if comma
if i.is_a?(Array)
_literal_append(sql, ds, i)
else
ds.literal_append(sql, i)
end
comma = true
end
sql << CLOSE_BRACKET
end
end
# PGArray subclass handling integer and float types, using a fast JSON
# parser. Does not handle numeric/decimal types, since JSON does deal
# with arbitrary precision (see PGDecimalArray for that).
class PGNumericArray < PGArray
# Character conversion map mapping input strings to JSON replacements
SUBST = {'{'.freeze=>'['.freeze, '}'.freeze=>']'.freeze, 'NULL'.freeze=>'null'.freeze}
# Regular expression matching input strings to convert
SUBST_RE = %r[\{|\}|NULL].freeze
# Parse the input string by using a gsub to convert non-JSON characters to
# JSON, running it through a regular JSON parser, and the doing a recursive
# map over the output to make sure the entries are in the correct type (mostly,
# to make sure real/double precision database types are returned as float and
# not integer).
def self.parse(string, type=nil)
new(recursive_map(JSON.parse(string.gsub(SUBST_RE){|m| SUBST[m]})), type)
end
# Convert each item in the array to the correct type, handling multi-dimensional
# arrays.
def self.recursive_map(array)
array.map do |i|
if i.is_a?(Array)
recursive_map(i)
elsif i
convert_item(i)
end
end
end
private_class_method :recursive_map
end
# PGArray subclass for decimal/numeric types. Uses the general
# parser as the JSON parser cannot handle arbitrary precision numbers.
class PGDecimalArray < PGArray
# Convert the item to a BigDecimal.
def self.convert_item(s)
BigDecimal.new(s.to_s)
end
private_class_method :convert_item
ARRAY_TYPE = 'decimal'.freeze
# Use the decimal type by default.
def array_type
super || ARRAY_TYPE
end
end
# PGArray subclass for handling real/double precision arrays.
class PGFloatArray < PGNumericArray
# Convert the item to a float.
def self.convert_item(s)
s.to_f
end
private_class_method :convert_item
ARRAY_TYPE = 'double precision'.freeze
# Use the double precision type by default.
def array_type
super || ARRAY_TYPE
end
end
# PGArray subclass for handling int2/int4/int8 arrays.
class PGIntegerArray < PGNumericArray
ARRAY_TYPE = 'int4'.freeze
# Use the int4 type by default.
def array_type
super || ARRAY_TYPE
end
end
# PGArray subclass for handling char/varchar/text arrays.
class PGStringArray < PGArray
CHAR = 'char'.freeze
VARCHAR = 'varchar'.freeze
TEXT = 'text'.freeze
# By default, use a text array. If char is given without
# a size, use varchar instead, as otherwise Postgres assumes
# length of 1, which is likely to cause data loss.
def array_type
case (c = super)
when nil
TEXT
when CHAR, :char
VARCHAR
else
c
end
end
end
PG_TYPES = {} unless defined?(PG_TYPES)
# Automatically convert the built-in numeric and text array
# types. to PGArray instances on retrieval if the native
# postgres adapter is used.
[ [1005, PGIntegerArray, 'int2'.freeze],
[1007, PGIntegerArray, 'int4'.freeze],
[1016, PGIntegerArray, 'int8'.freeze],
[1021, PGFloatArray, 'real'.freeze],
[1022, PGFloatArray, 'double precision'.freeze],
[1231, PGDecimalArray, 'numeric'.freeze],
[1009, PGStringArray, 'text'.freeze],
[1014, PGStringArray, 'char'.freeze],
[1015, PGStringArray, 'varchar'.freeze]
].each do |ftype, klass, type|
meth = klass.method(:parse)
PG_TYPES[ftype] = lambda{|s| meth.call(s, type)}
end
end
end
class Array
# Return a PGArray proxy to the receiver, using a
# specific database type if given. This is mostly useful
# as a short cut for creating PGArray objects that didn't
# come from the database.
def pg_array(type=nil)
Sequel::Postgres::PGArray.new(self, type)
end
end
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