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any.cr
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any.cr
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# `JSON::Any` is a convenient wrapper around all possible JSON types (`JSON::Type`)
# and can be used for traversing dynamic or unknown JSON structures.
#
# ```
# obj = JSON.parse(%({"access": [{"name": "mapping", "speed": "fast"}, {"name": "any", "speed": "slow"}]}))
# obj["access"][1]["name"].as_s # => "any"
# obj["access"][1]["speed"].as_s # => "slow"
# ```
#
# Note that methods used to traverse a JSON structure, `#[]`, `#[]?` and `#each`,
# always return a `JSON::Any` to allow further traversal. To convert them to `String`,
# `Int32`, etc., use the "as_" methods, such as `#as_s`, `#as_i`, which perform
# a type check against the raw underlying value. This means that invoking `#as_s`
# when the underlying value is not a String will raise: the value won't automatically
# be converted (parsed) to a String.
struct JSON::Any
include Enumerable(self)
# Reads a `JSON::Any` value from the given pull parser.
def self.new(pull : JSON::PullParser)
case pull.kind
when :null
new pull.read_null
when :bool
new pull.read_bool
when :int
new pull.read_int
when :float
new pull.read_float
when :string
new pull.read_string
when :begin_array
ary = [] of JSON::Type
pull.read_array do
ary << new(pull).raw
end
new ary
when :begin_object
hash = {} of String => JSON::Type
pull.read_object do |key|
hash[key] = new(pull).raw
end
new hash
else
raise "Unknown pull kind: #{pull.kind}"
end
end
# Returns the raw underlying value, a `JSON::Type`.
getter raw : JSON::Type
# Creates a `JSON::Any` that wraps the given `JSON::Type`.
def initialize(@raw : JSON::Type)
end
# Assumes the underlying value is an `Array` or `Hash` and returns
# its size.
# Raises if the underlying value is not an `Array` or `Hash`.
def size : Int
case object = @raw
when Array
object.size
when Hash
object.size
else
raise "expected Array or Hash for #size, not #{object.class}"
end
end
# Assumes the underlying value is an Array and returns the element
# at the given index.
# Raises if the underlying value is not an Array.
def [](index : Int) : JSON::Any
case object = @raw
when Array
Any.new object[index]
else
raise "expected Array for #[](index : Int), not #{object.class}"
end
end
# Assumes the underlying value is an Array and returns the element
# at the given index, or nil if out of bounds.
# Raises if the underlying value is not an Array.
def []?(index : Int) : JSON::Any?
case object = @raw
when Array
value = object[index]?
value.nil? ? nil : Any.new(value)
else
raise "expected Array for #[]?(index : Int), not #{object.class}"
end
end
# Assumes the underlying value is a Hash and returns the element
# with the given key.
# Raises if the underlying value is not a Hash.
def [](key : String) : JSON::Any
case object = @raw
when Hash
Any.new object[key]
else
raise "expected Hash for #[](key : String), not #{object.class}"
end
end
# Assumes the underlying value is a Hash and returns the element
# with the given key, or nil if the key is not present.
# Raises if the underlying value is not a Hash.
def []?(key : String) : JSON::Any?
case object = @raw
when Hash
value = object[key]?
value.nil? ? nil : Any.new(value)
else
raise "expected Hash for #[]?(key : String), not #{object.class}"
end
end
# Assumes the underlying value is an `Array` or `Hash` and yields each
# of the elements or key/values, always as `JSON::Any`.
# Raises if the underlying value is not an `Array` or `Hash`.
def each
case object = @raw
when Array
object.each do |elem|
yield Any.new(elem), Any.new(nil)
end
when Hash
object.each do |key, value|
yield Any.new(key), Any.new(value)
end
else
raise "expected Array or Hash for #each, not #{object.class}"
end
end
# Checks that the underlying value is `Nil`, and returns `nil`. Raises otherwise.
def as_nil : Nil
@raw.as(Nil)
end
# Checks that the underlying value is `Bool`, and returns its value. Raises otherwise.
def as_bool : Bool
@raw.as(Bool)
end
# Checks that the underlying value is `Bool`, and returns its value. Returns nil otherwise.
def as_bool? : (Bool | Nil)
as_bool if @raw.is_a?(Bool)
end
# Checks that the underlying value is `Int`, and returns its value as an `Int32`. Raises otherwise.
def as_i : Int32
@raw.as(Int).to_i
end
# Checks that the underlying value is `Int`, and returns its value as an `Int32`. Returns nil otherwise.
def as_i? : (Int32 | Nil)
as_i if @raw.is_a?(Int)
end
# Checks that the underlying value is `Int`, and returns its value as an `Int64`. Raises otherwise.
def as_i64 : Int64
@raw.as(Int).to_i64
end
# Checks that the underlying value is `Int`, and returns its value as an `Int64`. Returns nil otherwise.
def as_i64? : (Int64 | Nil)
as_i64 if @raw.is_a?(Int64)
end
# Checks that the underlying value is `Float`, and returns its value as an `Float64`. Raises otherwise.
def as_f : Float64
@raw.as(Float).to_f
end
# Checks that the underlying value is `Float`, and returns its value as an `Float64`. Returns nil otherwise.
def as_f? : (Float64 | Nil)
as_f if @raw.is_a?(Float64)
end
# Checks that the underlying value is `Float`, and returns its value as an `Float32`. Raises otherwise.
def as_f32 : Float32
@raw.as(Float).to_f32
end
# Checks that the underlying value is `Float`, and returns its value as an `Float32`. Returns nil otherwise.
def as_f32? : (Float32 | Nil)
as_f32 if (@raw.is_a?(Float32) || @raw.is_a?(Float64))
end
# Checks that the underlying value is `String`, and returns its value. Raises otherwise.
def as_s : String
@raw.as(String)
end
# Checks that the underlying value is `String`, and returns its value. Returns nil otherwise.
def as_s? : (String | Nil)
as_s if @raw.is_a?(String)
end
# Checks that the underlying value is `Array`, and returns its value. Raises otherwise.
def as_a : Array(Type)
@raw.as(Array)
end
# Checks that the underlying value is `Array`, and returns its value. Returns nil otherwise.
def as_a? : (Array(Type) | Nil)
as_a if @raw.is_a?(Array(Type))
end
# Checks that the underlying value is `Hash`, and returns its value. Raises otherwise.
def as_h : Hash(String, Type)
@raw.as(Hash)
end
# Checks that the underlying value is `Hash`, and returns its value. Returns nil otherwise.
def as_h? : (Hash(String, Type) | Nil)
as_h if @raw.is_a?(Hash(String, Type))
end
# :nodoc:
def inspect(io)
@raw.inspect(io)
end
# :nodoc:
def to_s(io)
@raw.to_s(io)
end
# :nodoc:
def pretty_print(pp)
@raw.pretty_print(pp)
end
# Returns true if both `self` and *other*'s raw object are equal.
def ==(other : JSON::Any)
raw == other.raw
end
# Returns true if the raw object is equal to *other*.
def ==(other)
raw == other
end
# :nodoc:
def hash
raw.hash
end
# :nodoc:
def to_json(io)
raw.to_json(io)
end
end
class Object
def ===(other : JSON::Any)
self === other.raw
end
end
class Regex
def ===(other : JSON::Any)
value = self === other.raw
$~ = $~
value
end
end