# struct MIME::MediaType

- MIME::MediaType
- Struct
- Value
- Object

##
Overview

A `MediaType` describes a MIME content type with optional parameters.

##
Defined in:

##
Constructors

- .new(media_type, params = {} of String => String)

  Creates a new `MediaType` instance.

- .parse(string : String) : MediaType

  Parses a MIME type string representation including any optional parameters, per RFC 1521.

- .parse?(string : String) : MediaType?

  Parses a MIME type string representation including any optional parameters, per RFC 1521.

##
Instance Method Summary

- #[](key : String) : String

  Returns the value for the parameter given by key.

- #[]=(key : String, value : String)

  Sets the value of parameter key to the given value.

- #[]?(key : String) : String?

  Returns the value for the parameter given by key.

- #each_parameter(&block : String, String -> _) : Nil

  Calls the given block for each parameter and passes in the key and the value.

- #each_parameter : Iterator(Tuple(String, String))

  Returns an iterator over the parameter which behaves like an `Iterator` returning a `Tuple` of key and value.

- #fetch(key : String, default)

  Returns the value for the parameter given by key, or when not found the value given by default.

- #fetch(key : String, &block : String -> _)

  Returns the value for the parameter given by key, or when not found calls the given block with the key.

- #media_type : String
- #sub_type : String?

  Second component of `#media_type` or `nil`.

- #to_s(io : IO) : Nil

  Same as `#inspect(io)`.

- #type : String

  First component of `#media_type`.

### Instance methods inherited from struct `Struct`

==(other) : Bool ==, hash(hasher) hash, inspect(io : IO) : Nil inspect, pretty_print(pp) : Nil pretty_print, to_s(io : IO) : Nil to_s

### Instance methods inherited from struct `Value`

==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup

### Instance methods inherited from class `Object`

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, __crystal_pseudo_! : Bool __crystal_pseudo_!, __crystal_pseudo_as(type : Class) __crystal_pseudo_as, __crystal_pseudo_as?(type : Class) __crystal_pseudo_as?, __crystal_pseudo_is_a?(type : Class) : Bool __crystal_pseudo_is_a?, __crystal_pseudo_nil? : Bool __crystal_pseudo_nil?, __crystal_pseudo_responds_to?(name : Symbol) : Bool __crystal_pseudo_responds_to?, class class, dup dup, hash(hasher)
hash hash, inspect : String
inspect(io : IO) : Nil inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s : String
to_s(io : IO) : Nil to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

### Class methods inherited from class `Object`

from_json(string_or_io, root : String)
from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml

##
Constructor Detail

def self.new(media_type, params = {} of String => String) #

Creates a new `MediaType` instance.

def self.parse(string : String) : MediaType #

Parses a MIME type string representation including any optional parameters, per RFC 1521. Media types are the values in `Content-Type` and `Content-Disposition` HTTP headers (RFC 2183).

Media type is lowercased and trimmed of whitespace. Param keys are lowercased.

Raises `MIME::Error` on error.

def self.parse?(string : String) : MediaType? #

Parses a MIME type string representation including any optional parameters, per RFC 1521. Media types are the values in `Content-Type` and `Content-Disposition` HTTP headers (RFC 2183).

Media type is lowercased and trimmed of whitespace. Param keys are lowercased.

Returns `nil` on error.

##
Instance Method Detail

def [](key : String) : String #

Returns the value for the parameter given by key. If not found, raises `KeyError`.

    require "mime/media_type"

    MIME::MediaType.parse("text/plain; charset=UTF-8")["charset"] # => "UTF-8"
    MIME::MediaType.parse("text/plain; charset=UTF-8")["foo"]     # raises KeyError

def []=(key : String, value : String) #

Sets the value of parameter key to the given value.

    require "mime/media_type"

    mime_type = MIME::MediaType.parse("x-application/example")
    mime_type["foo"] = "bar"
    mime_type["foo"] # => "bar"

def []?(key : String) : String? #

Returns the value for the parameter given by key. If not found, returns `nil`.

    require "mime/media_type"

    MIME::MediaType.parse("text/plain; charset=UTF-8")["charset"]? # => "UTF-8"
    MIME::MediaType.parse("text/plain; charset=UTF-8")["foo"]?     # => nil

def each_parameter(&block : String, String -> _) : Nil #

Calls the given block for each parameter and passes in the key and the value.

def each_parameter : Iterator(Tuple(String, String)) #

Returns an iterator over the parameter which behaves like an `Iterator` returning a `Tuple` of key and value.

def fetch(key : String, default) #

Returns the value for the parameter given by key, or when not found the value given by default.

    require "mime/media_type"

    MIME::MediaType.parse("x-application/example").fetch("foo", "baz")          # => "baz"
    MIME::MediaType.parse("x-application/example; foo=bar").fetch("foo", "baz") # => "bar"

def fetch(key : String, &block : String -> _) #

Returns the value for the parameter given by key, or when not found calls the given block with the key.

    require "mime/media_type"

    MIME::MediaType.parse("x-application/example").fetch("foo") { |key| key }          # => "foo"
    MIME::MediaType.parse("x-application/example; foo=bar").fetch("foo") { |key| key } # => "bar"

def media_type : String #
def sub_type : String? #

Second component of `#media_type` or `nil`.

    require "mime/media_type"

    MIME::MediaType.new("text/plain").sub_type # => "plain"
    MIME::MediaType.new("foo").sub_type        # => nil

def to_s(io : IO) : Nil #
Description copied from struct Struct

Same as `#inspect(io)`.

def type : String #

First component of `#media_type`.

    require "mime/media_type"

    MIME::MediaType.new("text/plain").type # => "text"
    MIME::MediaType.new("foo").type        # => "foo"