/
any.cr
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/
any.cr
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# `JSON::Any` is a convenient wrapper around all possible JSON types (`JSON::Any::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
# All possible JSON types.
alias Type = Nil | Bool | Int64 | Float64 | String | Array(Any) | Hash(String, Any)
# 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::Any
pull.read_array do
ary << new(pull)
end
new ary
when :begin_object
hash = {} of String => JSON::Any
pull.read_object do |key|
hash[key] = new(pull)
end
new hash
else
raise "Unknown pull kind: #{pull.kind}"
end
end
# Returns the raw underlying value.
getter raw : Type
# Creates a `JSON::Any` that wraps the given value.
def initialize(@raw : 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
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
object[index]?
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
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
object[key]?
else
raise "Expected Hash for #[]?(key : String), 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?
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?
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?
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?
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?
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?
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(Any)
@raw.as(Array)
end
# Checks that the underlying value is `Array`, and returns its value.
# Returns `nil` otherwise.
def as_a? : Array(Any)?
as_a if @raw.is_a?(Array)
end
# Checks that the underlying value is `Hash`, and returns its value.
# Raises otherwise.
def as_h : Hash(String, Any)
@raw.as(Hash)
end
# Checks that the underlying value is `Hash`, and returns its value.
# Returns `nil` otherwise.
def as_h? : Hash(String, Any)?
as_h if @raw.is_a?(Hash)
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
# See `Object#hash(hasher)`
def_hash raw
# :nodoc:
def to_json(json : JSON::Builder)
raw.to_json(json)
end
end
class Object
def ===(other : JSON::Any)
self === other.raw
end
end
struct Value
def ==(other : JSON::Any)
self == other.raw
end
end
class Reference
def ==(other : JSON::Any)
self == other.raw
end
end
class Array
def ==(other : JSON::Any)
self == other.raw
end
end
class Hash
def ==(other : JSON::Any)
self == other.raw
end
end
class Regex
def ===(other : JSON::Any)
value = self === other.raw
$~ = $~
value
end
end