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query.rb
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query.rb
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require "cgi"
require "forwardable"
require "stringio"
module Hurley
class Query
def self.default
@default ||= Nested
end
def self.default=(klass)
@default = klass
end
def self.parse(raw_query)
default.parse(raw_query)
end
def initialize(initial = nil)
@hash = {}
update(initial) if initial
end
extend Forwardable
def_delegators(:@hash,
:[], :[]=,
:each,
:keys,
:size,
:delete,
:key?,
)
def subset_of?(url)
query = url.respond_to?(:query) ? url.query : url
@hash.keys.all? do |key|
query[key] == @hash[key]
end
end
def update(absolute)
absolute.each do |key, value|
@hash[key] = value unless key?(key)
end
end
def parse_query(raw_query)
raw_query.to_s.split(AMP).each do |pair|
next if pair.empty?
escaped_key, escaped_value = pair.split(EQ, 2)
key = CGI.unescape(escaped_key)
value = escaped_value ? CGI.unescape(escaped_value) : nil
send(:decode_pair, key, value)
end
end
def multipart?
any_multipart?(@hash.values)
end
def to_query_string
build_pairs.map!(&:to_s).join(AMP)
end
def to_form(options = nil)
if multipart?
boundary = (options || RequestOptions.new).boundary
return MULTIPART_TYPE % boundary, to_io(boundary)
else
return FORM_TYPE, StringIO.new(to_query_string)
end
end
alias to_s to_query_string
def inspect
"#<%s %s>" % [
self.class.name,
@hash.inspect,
]
end
def self.inherited(base)
super
class << base
def parse(raw_query)
q = new
q.parse_query(raw_query)
q
end
end
end
class Nested < self
private
def decode_pair(key, value)
if key !~ END_BRACKET
self[key] = value
return
end
first_key = key[0, key.index(START_BRACKET)]
hash_keys = [first_key, *key.scan(/\[([^\]]+)?\]/).map(&:first)]
last_index = hash_keys.size - 1
container = self
hash_keys.each_with_index do |hash_key, index|
if index < last_index
if hash_keys[index+1]
container = if hash_key
container[hash_key] ||= {}
else
c = {}
container << c
container = c
end
else
container = container[hash_key] ||= []
end
else
if hash_key
container[hash_key] = value
else
container << value
end
end
end
end
def encode_array(pairs, key, escaped_key, value)
encode_nested_value(pairs, key, escaped_key, value)
end
def encode_hash(pairs, key, escaped_key, value)
value.each do |value_key, item|
nested_key = "#{key}[#{value_key}]"
nested_escaped_key = "#{escaped_key}%5B#{Url.escape_path(value_key)}%5D"
encode_nested_value(pairs, nested_key, nested_escaped_key, item)
end
end
def encode_nested_value(pairs, key, escaped_key, value)
case value
when Array
arr_key = "#{key}#{EMPTY_BRACKET}"
arr_escaped_key = escaped_key + EMPTY_ESCAPED_BRACKET
value.each do |item|
encode_nested_value(pairs, arr_key, arr_escaped_key, item)
end
when Hash
value.each do |hash_key, hash_value|
nested_key = "#{key}[#{hash_key}]"
nested_escaped_key = "#{escaped_key}%5B#{Url.escape_path(hash_key)}%5D"
encode_nested_value(pairs, nested_key, nested_escaped_key, hash_value)
end
else
pairs << Pair.new(key, escaped_key, value)
end
end
end
class Flat < self
private
def decode_pair(key, value)
self[key] = if key?(key)
Array(self[key]) << value
else
value
end
end
def encode_array(pairs, key, escaped_key, value)
value.each do |item|
pairs << Pair.new(key, escaped_key, item)
end
end
end
class Pair < Struct.new(:key, :escaped_key, :value)
def to_s
if value
"#{escaped_key}=#{Url.escape_path(value)}"
else
escaped_key
end
end
end
# Private Hurley::Query methods
private
def any_multipart?(array)
array.any? do |v|
case v
when Array then any_multipart?(v)
when Hash then any_multipart?(v.values)
else
v.respond_to?(:read)
end
end
end
def to_io(boundary, part_headers = nil)
parts = []
part_headers ||= {}
build_pairs.each do |pair|
parts << Multipart::Part.new(boundary, pair.key, pair.value, part_headers[pair.key])
end
parts << Multipart::EpiloguePart.new(boundary)
ios = []
len = 0
parts.each do |part|
len += part.length
ios << part.to_io
end
CompositeReadIO.new(len, *ios)
end
def build_pairs
pairs = []
@hash.each do |key, value|
escaped_key = Url.escape_path(key)
case value
when nil then pairs << Pair.new(key, escaped_key, nil)
when Array
encode_array(pairs, key, escaped_key, value)
when Hash
encode_hash(pairs, key, escaped_key, value)
else
pairs << Pair.new(key, escaped_key, value)
end
end
pairs
end
def encode_array(pairs, key, escaped_key, value)
raise NotImplementedError
end
def encode_hash(pairs, key, escaped_key, value)
raise NotImplementedError
end
AMP = "&".freeze
EQ = "=".freeze
EMPTY_BRACKET = "[]".freeze
EMPTY_ESCAPED_BRACKET = "%5B%5D".freeze
START_BRACKET = "[".freeze
END_BRACKET = /\]\z/
FORM_TYPE = "application/x-www-form-urlencoded".freeze
MULTIPART_TYPE = "multipart/form-data; boundary=%s".freeze
end
end