# struct MIME::MediaType

- MIME::MediaType
- Struct
- Value
- Object

##
Overview

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

##
Defined in:

mime/media_type.cr

##
Constructors

- .new(media_type : String, params : Hash(String, String) = {} 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.

##
Class Method Summary

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

  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) : String

  Sets the value of parameter key to the given value.

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

  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 : T) : String | T forall T

  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 | Nil

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

### Class methods inherited from struct `Struct`

pre_initialize(address : Pointer) : Nil pre_initialize

### Instance methods inherited from struct `Value`

==(other : Log::Metadata::Value)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup

### Instance methods inherited from class `Object`

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
hash hash, in?(collection : Object) : Bool
in?(*values : Object) : Bool in?, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String to_json, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil to_pretty_json, to_s(io : IO) : Nil
to_s : String to_s, to_yaml(io : IO) : Nil
to_yaml : String to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

### Class methods inherited from class `Object`

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

### Macros inherited from class `Object`

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

##
Constructor Detail

def self.new(media_type : String, params : Hash(String, String) = {} 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.

##
Class Method Detail

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

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) : 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 | Nil #

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 : T) : String | T forall T #

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 | Nil #

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"