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module RestClient
# The ParamsArray class is used to represent an ordered list of [key, value]
# pairs. Use this when you need to include a key multiple times or want
# explicit control over parameter ordering.
#
# Most of the request payload & parameter functions normally accept a Hash of
# keys => values, which does not allow for duplicated keys.
#
# @see RestClient::Utils.encode_query_string
# @see RestClient::Utils.flatten_params
#
class ParamsArray
include Enumerable
# @param array [Array<Array>] An array of parameter key,value pairs. These
# pairs may be 2 element arrays [key, value] or single element hashes
# {key => value}. They may also be single element arrays to represent a
# key with no value.
#
# @example
# >> ParamsArray.new([[:foo, 123], [:foo, 456], [:bar, 789]])
# This will be encoded as "foo=123&foo=456&bar=789"
#
# @example
# >> ParamsArray.new({foo: 123, bar: 456})
# This is valid, but there's no reason not to just use the Hash directly
# instead of a ParamsArray.
#
#
def initialize(array)
@array = process_input(array)
end
def each(*args, &blk)
@array.each(*args, &blk)
end
def empty?
@array.empty?
end
private
def process_input(array)
array.map {|v| process_pair(v) }
end
# A pair may be:
# - A single element hash, e.g. {foo: 'bar'}
# - A two element array, e.g. ['foo', 'bar']
# - A one element array, e.g. ['foo']
#
def process_pair(pair)
case pair
when Hash
if pair.length != 1
raise ArgumentError.new("Bad # of fields for pair: #{pair.inspect}")
end
pair.to_a.fetch(0)
when Array
if pair.length > 2
raise ArgumentError.new("Bad # of fields for pair: #{pair.inspect}")
end
[pair.fetch(0), pair[1]]
else
# recurse, converting any non-array to an array
process_pair(pair.to_a)
end
end
end
end
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