CBOR::Any, WIP
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3d232e6005
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# `CBOR::Any` is a convenient wrapper around all possible CBOR types (`CBOR::Any::Type`)
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# and can be used for traversing dynamic or unknown CBOR structures.
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#
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# ```
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# require "json"
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#
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# obj = CBOR.parse(%({"access": [{"name": "mapping", "speed": "fast"}, {"name": "any", "speed": "slow"}]}))
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# obj["access"][1]["name"].as_s # => "any"
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# obj["access"][1]["speed"].as_s # => "slow"
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# ```
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#
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# Note that methods used to traverse a CBOR structure, `#[]` and `#[]?`,
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# always return a `CBOR::Any` to allow further traversal. To convert them to `String`,
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# `Int32`, etc., use the `as_` methods, such as `#as_s`, `#as_i`, which perform
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# a type check against the raw underlying value. This means that invoking `#as_s`
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# when the underlying value is not a String will raise: the value won't automatically
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# be converted (parsed) to a `String`.
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struct CBOR::Any
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# All possible CBOR types.
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alias Type = Nil |
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Bool |
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String |
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Bytes |
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Array(Any) |
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Hash(String, Any) |
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Hash(Any, Any) |
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Int8 |
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UInt8 |
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Int16 |
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UInt16 |
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Int32 |
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UInt32 |
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Int64 |
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UInt64 |
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Int128 |
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Float32 |
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Float64
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# Reads a `CBOR::Any` from a JSON::Any structure.
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def self.new(json : JSON::Any)
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new json.raw
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end
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def self.new(value)
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case value
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when Nil
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new nil
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when Bool
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new value
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when Int64
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new value
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when Float64
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new value
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when String
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new value
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when Array(Type)
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ary = [] of CBOR::Any
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value.each do |v|
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ary << new(v)
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end
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new ary
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when Array(JSON::Any)
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ary = [] of CBOR::Any
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value.each do |v|
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ary << new(v)
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end
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new ary
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when Array(CBOR::Type)
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ary = [] of CBOR::Any
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value.each do |v|
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ary << new(v)
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end
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new ary
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when Hash(String, JSON::Any)
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hash = {} of String => CBOR::Any
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value.each do |key, v|
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hash[key] = new(v)
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end
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new hash
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when Hash(CBOR::Type, CBOR::Type)
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hash = {} of CBOR::Any => CBOR::Any
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value.each do |key, v|
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hash[new(key)] = new(v)
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end
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new hash
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when Hash(String, Type)
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hash = {} of String => CBOR::Any
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value.each do |key, v|
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hash[key] = new(v)
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end
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new hash
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else
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raise "Unknown value type: #{value.class}"
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end
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end
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# Reads a `CBOR::Any` from a Decoder.
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def self.new(decoder : CBOR::Decoder)
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puts "from a decoder"
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new decoder.read_value
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end
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# Reads a `CBOR::Any` from a buffer.
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def self.new(input : Slice(UInt8))
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puts "from a buffer"
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new CBOR::Decoder.new(input)
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end
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# Returns the raw underlying value.
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getter raw : Type
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# Creates a `CBOR::Any` that wraps the given value.
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def initialize(@raw : Type)
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end
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# Assumes the underlying value is an `Array` or `Hash` and returns its size.
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# Raises if the underlying value is not an `Array` or `Hash`.
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def size : Int
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case object = @raw
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when Array
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object.size
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when Hash
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object.size
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else
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raise "Expected Array or Hash for #size, not #{object.class}"
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end
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end
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# Assumes the underlying value is an `Array` and returns the element
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# at the given index.
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# Raises if the underlying value is not an `Array`.
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def [](index : Int) : CBOR::Any
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case object = @raw
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when Array
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object[index]
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else
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raise "Expected Array for #[](index : Int), not #{object.class}"
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end
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end
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# Assumes the underlying value is an `Array` and returns the element
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# at the given index, or `nil` if out of bounds.
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# Raises if the underlying value is not an `Array`.
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def []?(index : Int) : CBOR::Any?
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case object = @raw
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when Array
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object[index]?
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else
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raise "Expected Array for #[]?(index : Int), not #{object.class}"
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end
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end
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# Assumes the underlying value is a `Hash` and returns the element
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# with the given key.
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# Raises if the underlying value is not a `Hash`.
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def [](key : String) : CBOR::Any
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case object = @raw
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when Hash
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object[key]
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else
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raise "Expected Hash for #[](key : String), not #{object.class}"
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end
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end
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# Assumes the underlying value is a `Hash` and returns the element
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# with the given key, or `nil` if the key is not present.
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# Raises if the underlying value is not a `Hash`.
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def []?(key : String) : CBOR::Any?
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case object = @raw
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when Hash
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object[key]?
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else
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raise "Expected Hash for #[]?(key : String), not #{object.class}"
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end
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end
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# Traverses the depth of a structure and returns the value.
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# Returns `nil` if not found.
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def dig?(key : String | Int, *subkeys)
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if value = self[key]?
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value.dig?(*subkeys)
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end
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end
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# :nodoc:
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def dig?(key : String | Int)
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case @raw
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when Hash, Array
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self[key]?
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else
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nil
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end
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end
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# Traverses the depth of a structure and returns the value, otherwise raises.
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def dig(key : String | Int, *subkeys)
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if (value = self[key]) && value.responds_to?(:dig)
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return value.dig(*subkeys)
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end
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raise "CBOR::Any value not diggable for key: #{key.inspect}"
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end
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# :nodoc:
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def dig(key : String | Int)
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self[key]
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end
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# Checks that the underlying value is `Nil`, and returns `nil`.
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# Raises otherwise.
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def as_nil : Nil
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@raw.as(Nil)
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end
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# Checks that the underlying value is `Bool`, and returns its value.
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# Raises otherwise.
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def as_bool : Bool
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@raw.as(Bool)
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end
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# Checks that the underlying value is `Bool`, and returns its value.
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# Returns `nil` otherwise.
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def as_bool? : Bool?
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as_bool if @raw.is_a?(Bool)
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end
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# Checks that the underlying value is `Int`, and returns its value as an `Int32`.
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# Raises otherwise.
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def as_i : Int32
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@raw.as(Int).to_i
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end
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# Checks that the underlying value is `Int`, and returns its value as an `Int32`.
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# Returns `nil` otherwise.
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def as_i? : Int32?
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as_i if @raw.is_a?(Int)
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end
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# Checks that the underlying value is `Int`, and returns its value as an `Int64`.
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# Raises otherwise.
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def as_i64 : Int64
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@raw.as(Int).to_i64
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end
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# Checks that the underlying value is `Int`, and returns its value as an `Int64`.
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# Returns `nil` otherwise.
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def as_i64? : Int64?
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as_i64 if @raw.is_a?(Int64)
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end
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# Checks that the underlying value is `Float`, and returns its value as an `Float64`.
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# Raises otherwise.
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def as_f : Float64
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@raw.as(Float64)
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end
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# Checks that the underlying value is `Float`, and returns its value as an `Float64`.
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# Returns `nil` otherwise.
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def as_f? : Float64?
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@raw.as?(Float64)
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end
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# Checks that the underlying value is `Float`, and returns its value as an `Float32`.
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# Raises otherwise.
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def as_f32 : Float32
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@raw.as(Float).to_f32
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end
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# Checks that the underlying value is `Float`, and returns its value as an `Float32`.
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# Returns `nil` otherwise.
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def as_f32? : Float32?
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as_f32 if @raw.is_a?(Float)
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end
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# Checks that the underlying value is `String`, and returns its value.
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# Raises otherwise.
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def as_s : String
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@raw.as(String)
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end
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# Checks that the underlying value is `String`, and returns its value.
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# Returns `nil` otherwise.
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def as_s? : String?
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as_s if @raw.is_a?(String)
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end
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# Checks that the underlying value is `Array`, and returns its value.
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# Raises otherwise.
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def as_a : Array(Any)
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@raw.as(Array)
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end
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# Checks that the underlying value is `Array`, and returns its value.
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# Returns `nil` otherwise.
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def as_a? : Array(Any)?
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as_a if @raw.is_a?(Array)
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end
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# Checks that the underlying value is `Hash`, and returns its value.
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# Raises otherwise.
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def as_h : Hash(String, Any)
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@raw.as(Hash)
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end
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# Checks that the underlying value is `Hash`, and returns its value.
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# Returns `nil` otherwise.
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def as_h? : Hash(String, Any)?
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as_h if @raw.is_a?(Hash)
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end
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# :nodoc:
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def inspect(io : IO) : Nil
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@raw.inspect(io)
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end
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# :nodoc:
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def to_s(io : IO) : Nil
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@raw.to_s(io)
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end
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# :nodoc:
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def pretty_print(pp)
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@raw.pretty_print(pp)
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end
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# Returns `true` if both `self` and *other*'s raw object are equal.
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def ==(other : CBOR::Any)
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raw == other.raw
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end
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# Returns `true` if the raw object is equal to *other*.
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def ==(other)
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raw == other
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end
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# See `Object#hash(hasher)`
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def_hash raw
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# :nodoc:
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def to_json(json : JSON::Builder)
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raw.to_json(json)
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end
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def to_yaml(yaml : YAML::Nodes::Builder)
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raw.to_yaml(yaml)
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end
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# Returns a new CBOR::Any instance with the `raw` value `dup`ed.
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def dup
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Any.new(raw.dup)
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end
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# Returns a new CBOR::Any instance with the `raw` value `clone`ed.
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def clone
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Any.new(raw.clone)
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end
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end
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class Object
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def ===(other : CBOR::Any)
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self === other.raw
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end
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end
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struct Value
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def ==(other : CBOR::Any)
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self == other.raw
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end
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end
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class Reference
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def ==(other : CBOR::Any)
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self == other.raw
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end
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end
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class Array
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def ==(other : CBOR::Any)
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self == other.raw
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end
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end
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class Hash
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def ==(other : CBOR::Any)
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self == other.raw
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end
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end
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class Regex
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def ===(other : CBOR::Any)
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value = self === other.raw
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$~ = $~
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value
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end
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end
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