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# frozen-string-literal: true
#
# The sqlite_json_ops extension adds support to Sequel's DSL to make
# it easier to call SQLite JSON functions and operators (added
# first in SQLite 3.38.0).
#
# To load the extension:
#
# Sequel.extension :sqlite_json_ops
#
# This extension works by calling methods on Sequel::SQLite::JSONOp objects,
# which you can create via Sequel.sqlite_json_op:
#
# j = Sequel.sqlite_json_op(:json_column)
#
# Also, on most Sequel expression objects, you can call the sqlite_json_op method
# to create a Sequel::SQLite::JSONOp object:
#
# j = Sequel[:json_column].sqlite_json_op
#
# If you have loaded the {core_extensions extension}[rdoc-ref:doc/core_extensions.rdoc],
# or you have loaded the core_refinements extension
# and have activated refinements for the file, you can also use Symbol#sqlite_json_op:
#
# j = :json_column.sqlite_json_op
#
# The following methods are available for Sequel::SQLite::JSONOp instances:
#
# j[1] # (json_column ->> 1)
# j.get(1) # (json_column ->> 1)
# j.get_text(1) # (json_column -> 1)
# j.extract('$.a') # json_extract(json_column, '$.a')
#
# j.array_length # json_array_length(json_column)
# j.type # json_type(json_column)
# j.valid # json_valid(json_column)
# j.json # json(json_column)
#
# j.insert('$.a', 1) # json_insert(json_column, '$.a', 1)
# j.set('$.a', 1) # json_set(json_column, '$.a', 1)
# j.replace('$.a', 1) # json_replace(json_column, '$.a', 1)
# j.remove('$.a') # json_remove(json_column, '$.a')
# j.patch('{"a":2}') # json_patch(json_column, '{"a":2}')
#
# j.each # json_each(json_column)
# j.tree # json_tree(json_column)
#
# Related modules: Sequel::SQLite::JSONOp
#
module Sequel
module SQLite
# The JSONOp class is a simple container for a single object that
# defines methods that yield Sequel expression objects representing
# SQLite json operators and functions.
#
# In the method documentation examples, assume that:
#
# json_op = Sequel.sqlite_json_op(:json)
class JSONOp < Sequel::SQL::Wrapper
GET = ["(".freeze, " ->> ".freeze, ")".freeze].freeze
private_constant :GET
GET_JSON = ["(".freeze, " -> ".freeze, ")".freeze].freeze
private_constant :GET_JSON
# Returns an expression for getting the JSON array element or object field
# at the specified path as a SQLite value.
#
# json_op[1] # (json ->> 1)
# json_op['a'] # (json ->> 'a')
# json_op['$.a.b'] # (json ->> '$.a.b')
# json_op['$[1][2]'] # (json ->> '$[1][2]')
def [](key)
json_op(GET, key)
end
alias get []
# Returns an expression for the length of the JSON array, or the JSON array at
# the given path.
#
# json_op.array_length # json_array_length(json)
# json_op.array_length('$[1]') # json_array_length(json, '$[1]')
def array_length(*args)
Sequel::SQL::NumericExpression.new(:NOOP, function(:array_length, *args))
end
# Returns an expression for a set of information extracted from the top-level
# members of the JSON array or object, or the top-level members of the JSON array
# or object at the given path.
#
# json_op.each # json_each(json)
# json_op.each('$.a') # json_each(json, '$.a')
def each(*args)
function(:each, *args)
end
# Returns an expression for the JSON array element or object field at the specified
# path as a SQLite value, but only accept paths as arguments, and allow the use of
# multiple paths.
#
# json_op.extract('$.a') # json_extract(json, '$.a')
# json_op.extract('$.a', '$.b') # json_extract(json, '$.a', '$.b')
def extract(*a)
function(:extract, *a)
end
# Returns an expression for getting the JSON array element or object field at the
# specified path as a JSON value.
#
# json_op.get_json(1) # (json -> 1)
# json_op.get_json('a') # (json -> 'a')
# json_op.get_json('$.a.b') # (json -> '$.a.b')
# json_op.get_json('$[1][2]') # (json -> '$[1][2]')
def get_json(key)
self.class.new(json_op(GET_JSON, key))
end
# Returns an expression for creating new entries at the given paths in the JSON array
# or object, but not overwriting existing entries.
#
# json_op.insert('$.a', 1) # json_insert(json, '$.a', 1)
# json_op.insert('$.a', 1, '$.b', 2) # json_insert(json, '$.a', 1, '$.b', 2)
def insert(path, value, *args)
wrapped_function(:insert, path, value, *args)
end
# Returns an expression for a minified version of the JSON.
#
# json_op.json # json(json)
def json
self.class.new(SQL::Function.new(:json, self))
end
alias minify json
# Returns an expression for updating the JSON object using the RFC 7396 MergePatch algorithm
#
# json_op.patch('{"a": 1, "b": null}') # json_patch(json, '{"a": 1, "b": null}')
def patch(json_patch)
wrapped_function(:patch, json_patch)
end
# Returns an expression for removing entries at the given paths from the JSON array or object.
#
# json_op.remove('$.a') # json_remove(json, '$.a')
# json_op.remove('$.a', '$.b') # json_remove(json, '$.a', '$.b')
def remove(path, *paths)
wrapped_function(:remove, path, *paths)
end
# Returns an expression for replacing entries at the given paths in the JSON array or object,
# but not creating new entries.
#
# json_op.replace('$.a', 1) # json_replace(json, '$.a', 1)
# json_op.replace('$.a', 1, '$.b', 2) # json_replace(json, '$.a', 1, '$.b', 2)
def replace(path, value, *args)
wrapped_function(:replace, path, value, *args)
end
# Returns an expression for creating or replacing entries at the given paths in the
# JSON array or object.
#
# json_op.set('$.a', 1) # json_set(json, '$.a', 1)
# json_op.set('$.a', 1, '$.b', 2) # json_set(json, '$.a', 1, '$.b', 2)
def set(path, value, *args)
wrapped_function(:set, path, value, *args)
end
# Returns an expression for a set of information extracted from the JSON array or object, or
# the JSON array or object at the given path.
#
# json_op.tree # json_tree(json)
# json_op.tree('$.a') # json_tree(json, '$.a')
def tree(*args)
function(:tree, *args)
end
# Returns an expression for the type of the JSON value or the JSON value at the given path.
#
# json_op.type # json_type(json)
# json_op.type('$[1]') # json_type(json, '$[1]')
def type(*args)
Sequel::SQL::StringExpression.new(:NOOP, function(:type, *args))
end
alias typeof type
# Returns a boolean expression for whether the JSON is valid or not.
def valid
Sequel::SQL::BooleanExpression.new(:NOOP, function(:valid))
end
private
# Internals of the [], get, get_json methods, using a placeholder literal string.
def json_op(str, args)
self.class.new(Sequel::SQL::PlaceholderLiteralString.new(str, [self, args]))
end
# Internals of the methods that return functions prefixed with +json_+.
def function(name, *args)
SQL::Function.new("json_#{name}", self, *args)
end
# Internals of the methods that return functions prefixed with +json_+, that
# return JSON values.
def wrapped_function(*args)
self.class.new(function(*args))
end
end
module JSONOpMethods
# Wrap the receiver in an JSONOp so you can easily use the SQLite
# json functions and operators with it.
def sqlite_json_op
JSONOp.new(self)
end
end
end
module SQL::Builders
# Return the object wrapped in an SQLite::JSONOp.
def sqlite_json_op(v)
case v
when SQLite::JSONOp
v
else
SQLite::JSONOp.new(v)
end
end
end
class SQL::GenericExpression
include Sequel::SQLite::JSONOpMethods
end
class LiteralString
include Sequel::SQLite::JSONOpMethods
end
end
# :nocov:
if Sequel.core_extensions?
class Symbol
include Sequel::SQLite::JSONOpMethods
end
end
if defined?(Sequel::CoreRefinements)
module Sequel::CoreRefinements
refine Symbol do
send INCLUDE_METH, Sequel::SQLite::JSONOpMethods
end
end
end
# :nocov:
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