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module ActionController
class UrlEncodedPairParser < StringScanner #:nodoc:
class << self
def parse_query_parameters(query_string)
return {} if query_string.blank?
pairs = query_string.split('&').collect do |chunk|
next if chunk.empty?
key, value = chunk.split('=', 2)
next if key.empty?
value = value.nil? ? nil : CGI.unescape(value)
[ CGI.unescape(key), value ]
end.compact
new(pairs).result
end
def parse_hash_parameters(params)
parser = new
params = params.dup
until params.empty?
for key, value in params
if key.blank?
params.delete(key)
elsif value.is_a?(Array)
parser.parse(key, get_typed_value(value.shift))
params.delete(key) if value.empty?
else
parser.parse(key, get_typed_value(value))
params.delete(key)
end
end
end
parser.result
end
private
def get_typed_value(value)
case value
when String
value
when NilClass
''
when Array
value.map { |v| get_typed_value(v) }
when Hash
if value.has_key?(:tempfile) && !value[:filename].blank?
upload = value[:tempfile]
upload.extend(UploadedFile)
upload.original_path = value[:filename]
upload.content_type = value[:type]
upload
else
nil
end
else
raise "Unknown form value: #{value.inspect}"
end
end
end
attr_reader :top, :parent, :result
def initialize(pairs = [])
super('')
@result = {}
pairs.each { |key, value| parse(key, value) }
end
KEY_REGEXP = %r{([^\[\]=&]+)}
BRACKETED_KEY_REGEXP = %r{\[([^\[\]=&]+)\]}
# Parse the query string
def parse(key, value)
self.string = key
@top, @parent = result, nil
# First scan the bare key
key = scan(KEY_REGEXP) or return
key = post_key_check(key)
# Then scan as many nestings as present
until eos?
r = scan(BRACKETED_KEY_REGEXP) or return
key = self[1]
key = post_key_check(key)
end
bind(key, value)
end
private
# After we see a key, we must look ahead to determine our next action. Cases:
#
# [] follows the key. Then the value must be an array.
# = follows the key. (A value comes next)
# & or the end of string follows the key. Then the key is a flag.
# otherwise, a hash follows the key.
def post_key_check(key)
if scan(/\[\]/) # a[b][] indicates that b is an array
container(key, Array)
nil
elsif check(/\[[^\]]/) # a[b] indicates that a is a hash
container(key, Hash)
nil
else # End of key? We do nothing.
key
end
end
# Add a container to the stack.
def container(key, klass)
type_conflict! klass, top[key] if top.is_a?(Hash) && top.key?(key) && ! top[key].is_a?(klass)
value = bind(key, klass.new)
type_conflict! klass, value unless value.is_a?(klass)
push(value)
end
# Push a value onto the 'stack', which is actually only the top 2 items.
def push(value)
@parent, @top = @top, value
end
# Bind a key (which may be nil for items in an array) to the provided value.
def bind(key, value)
if top.is_a? Array
if key
if top[-1].is_a?(Hash) && ! top[-1].key?(key)
top[-1][key] = value
else
top << {key => value}.with_indifferent_access
end
push top.last
return top[key]
else
top << value
return value
end
elsif top.is_a? Hash
key = CGI.unescape(key)
parent << (@top = {}) if top.key?(key) && parent.is_a?(Array)
top[key] ||= value
return top[key]
else
raise ArgumentError, "Don't know what to do: top is #{top.inspect}"
end
end
def type_conflict!(klass, value)
raise TypeError, "Conflicting types for parameter containers. Expected an instance of #{klass} but found an instance of #{value.class}. This can be caused by colliding Array and Hash parameters like qs[]=value&qs[key]=value. (The parameters received were #{value.inspect}.)"
end
end
end
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