struct HTTP::Params

Overview

Represents a collection of http parameters and their respective values.

Included Modules

Defined in:

http/params.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from module Enumerable({String, String})

all?(&)
all?(pattern)
all?
all?
, any?(&)
any?(pattern)
any?
any?
, chunks(&block : {String, String} -> U) forall U chunks, compact_map(&) compact_map, count(&)
count(item)
count
, cycle(&)
cycle(n, &)
cycle
, each(&block : {String, String} -> _) each, each_cons(count : Int, reuse = false, &) each_cons, each_cons_pair(& : {String, String}, {String, String} -> _) : Nil each_cons_pair, each_slice(count : Int, reuse = false, &) each_slice, each_with_index(offset = 0, &) each_with_index, each_with_object(obj, &) each_with_object, empty? empty?, find(if_none = nil, &) find, first(&)
first(count : Int)
first
first
, first? first?, flat_map(&block : {String, String} -> Array(U) | Iterator(U) | U) forall U flat_map, group_by(&block : {String, String} -> U) forall U group_by, in_groups_of(size : Int, filled_up_with : U = nil) forall U
in_groups_of(size : Int, filled_up_with : U = nil, reuse = false, &) forall U
in_groups_of
, includes?(obj) includes?, index(&)
index(obj)
index
, index_by(&block : {String, String} -> U) forall U index_by, join(separator = "", & : {String, String} -> )
join(separator, io : IO, &)
join(io : IO, separator = "", & : {String, String}, IO -> )
join(separator = "")
join(separator, io : IO)
join(io : IO, separator = "")
join
, map(&block : {String, String} -> U) forall U map, map_with_index(offset = 0, &block : {String, String}, Int32 -> U) forall U map_with_index, max max, max? max?, max_by(&block : {String, String} -> U) forall U max_by, max_by?(&block : {String, String} -> U) forall U max_by?, max_of(&block : {String, String} -> U) forall U max_of, max_of?(&block : {String, String} -> U) forall U max_of?, min min, min? min?, min_by(&block : {String, String} -> U) forall U min_by, min_by?(&block : {String, String} -> U) forall U min_by?, min_of(&block : {String, String} -> U) forall U min_of, min_of?(&block : {String, String} -> U) forall U min_of?, minmax minmax, minmax? minmax?, minmax_by(&block : {String, String} -> U) forall U minmax_by, minmax_by?(&block : {String, String} -> U) forall U minmax_by?, minmax_of(&block : {String, String} -> U) forall U minmax_of, minmax_of?(&block : {String, String} -> U) forall U minmax_of?, none?
none?(pattern)
none?(&)
none?
, one?(&)
one?(pattern)
one?
one?
, partition(&) partition, product
product(initial : Number)
product(initial : Number, &)
product(&)
product
, reduce(memo, &)
reduce(&)
reduce
, reduce?(&) reduce?, reject(pattern)
reject(type : U.class) forall U
reject(&block : {String, String} -> )
reject
, select(pattern)
select(type : U.class) forall U
select(&block : {String, String} -> )
select
, size size, skip(count : Int) skip, skip_while(&) skip_while, sum(initial)
sum
sum(initial, &)
sum(&)
sum
, take_while(&) take_while, tally : Hash({String, String}, Int32) tally, to_a to_a, to_h
to_h(&block : {String, String} -> Tuple(K, V)) forall K, V
to_h
, to_set to_set, zip(*others : Indexable | Iterable | Iterator, &)
zip(*others : Indexable | Iterable | Iterator)
zip
, zip?(*others : Indexable | Iterable | Iterator, &)
zip?(*others : Indexable | Iterable | Iterator)
zip?

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

! : 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?(*values : Object) : Bool
in?(collection) : Bool
in?
, inspect : String
inspect(io : IO) : Nil
inspect
, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, 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)
to_json
to_json
, to_pretty_json(io : IO, indent : String = " ")
to_pretty_json(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(raw_params : Hash(String, Array(String))) #

[View source]
def self.new #

Returns an empty HTTP::Params.


[View source]
def self.parse(query : String) : self #

Parses an HTTP query string into a HTTP::Params

require "http/params"

HTTP::Params.parse("foo=bar&foo=baz&qux=zoo")
# => #<HTTP::Params @raw_params = {"foo" => ["bar", "baz"], "qux" => ["zoo"]}>

[View source]

Class Method Detail

def self.build(&block : Builder -> ) : String #

Builds an url-encoded HTTP form/query.

The yielded object has an #add method that accepts two arguments, a key (String) and a value (String or Nil). Keys and values are escaped using URI.encode_www_form.

require "http/params"

params = HTTP::Params.build do |form|
  form.add "color", "black"
  form.add "name", "crystal"
  form.add "year", "2012 - today"
end
params # => "color=black&name=crystal&year=2012+-+today"

[View source]
def self.encode(hash : Hash(String, String | Array(String))) #

Returns the given key value pairs as a url-encoded HTTP form/query.

require "http/params"

HTTP::Params.encode({"foo" => "bar", "baz" => ["quux", "quuz"]}) # => "foo=bar&baz=quux&baz=quuz"

[View source]
def self.encode(named_tuple : NamedTuple) #

Returns the given key value pairs as a url-encoded HTTP form/query.

require "http/params"

HTTP::Params.encode({foo: "bar", baz: ["quux", "quuz"]}) # => "foo=bar&baz=quux&baz=quuz"

[View source]
def self.parse(query : String, &) #

Parses an HTTP query and yields each key-value pair.

require "http/params"

query = "foo=bar&foo=baz&qux=zoo"
HTTP::Params.parse(query) do |key, value|
  # ...
end

[View source]

Instance Method Detail

def ==(other : self) #

[View source]
def [](name) #

Returns first value for specified param name.

require "http/params"

params = HTTP::Params.parse("email=john@example.org")
params["email"]              # => "john@example.org"
params["non_existent_param"] # KeyError

[View source]
def []=(name, value : String | Array(String)) #

Sets the name key to value.

require "http/params"

params = HTTP::Params{"a" => ["b", "c"]}
params["a"] = "d"
params["a"]           # => "d"
params.fetch_all("a") # => ["d"]

params["a"] = ["e", "f"]
params["a"]           # => "e"
params.fetch_all("a") # => ["e", "f"]

[View source]
def []?(name) #

Returns first value or nil for specified param name.

params["email"]?              # => "john@example.org"
params["non_existent_param"]? # nil

[View source]
def add(name, value) #

Appends new value for specified param name. Creates param when there was no such param.

params.add("item", "keychain")
params.fetch_all("item") # => ["pencil", "book", "workbook", "keychain"]

[View source]
def delete(name) #

Deletes first value for provided param name. If there are no values left, deletes param itself. Returns deleted value.

params.delete("item")    # => "keychain"
params.fetch_all("item") # => ["keynote"]

params.delete("item") # => "keynote"
params["item"]        # KeyError

params.delete("non_existent_param") # KeyError

[View source]
def delete_all(name) #

Deletes all values for provided param name. Returns array of deleted values.

params.set_all("comments", ["hello, world!", ":+1:"])
params.delete_all("comments") # => ["hello, world!", ":+1:"]
params.has_key?("comments")   # => false

[View source]
def each(&) #

Allows to iterate over all name-value pairs.

params.each do |name, value|
  puts "#{name} => #{value}"
end

# Outputs:
# email => john@example.org
# item => keychain
# item => keynote

[View source]
def empty?(*args, **options) #

Returns true if params is empty.

HTTP::Params.new.empty?                              # => true
HTTP::Params.parse("foo=bar&foo=baz&qux=zoo").empty? # => false

[View source]
def empty?(*args, **options, &) #

Returns true if params is empty.

HTTP::Params.new.empty?                              # => true
HTTP::Params.parse("foo=bar&foo=baz&qux=zoo").empty? # => false

[View source]
def fetch(name, default) #

Returns first value for specified param name. Fallbacks to provided default value when there is no such param.

params.fetch("email", "none@example.org")           # => "john@example.org"
params.fetch("non_existent_param", "default value") # => "default value"

[View source]
def fetch(name, &) #

Returns first value for specified param name. Fallbacks to return value of provided block when there is no such param.

params.fetch("email") { raise "Email is missing" }              # raises "Email is missing"
params.fetch("non_existent_param") { "default computed value" } # => "default computed value"

[View source]
def fetch_all(name) #

Returns all values for specified param name.

params.set_all("item", ["pencil", "book", "workbook"])
params.fetch_all("item") # => ["pencil", "book", "workbook"]

[View source]
def has_key?(*args, **options, &) #

Returns true if param with provided name exists.

params.has_key?("email")   # => true
params.has_key?("garbage") # => false

[View source]
def has_key?(*args, **options) #

Returns true if param with provided name exists.

params.has_key?("email")   # => true
params.has_key?("garbage") # => false

[View source]
def set_all(name, values) #

Sets all values for specified param name at once.

params.set_all("item", ["keychain", "keynote"])
params.fetch_all("item") # => ["keychain", "keynote"]

[View source]
def to_s(io : IO) : Nil #

Serializes to string representation as http url-encoded form.

require "http/params"

params = HTTP::Params.parse("item=keychain&item=keynote&email=john@example.org")
params.to_s # => "item=keychain&item=keynote&email=john%40example.org"

[View source]