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author | Pratik Naik <pratiknaik@gmail.com> | 2008-12-25 03:51:04 +0000 |
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committer | Pratik Naik <pratiknaik@gmail.com> | 2008-12-25 03:51:04 +0000 |
commit | e898f82a743063652aed802d99ea8b5deac2ec3c (patch) | |
tree | 5cfc968597bdf33bd4de15e81c71bf2923211d50 /actionpack/lib/action_controller/url_encoded_pair_parser.rb | |
parent | 9c1e48eaea921efa67fbeed1ff1876dc710f8fd2 (diff) | |
download | rails-e898f82a743063652aed802d99ea8b5deac2ec3c.tar.gz rails-e898f82a743063652aed802d99ea8b5deac2ec3c.tar.bz2 rails-e898f82a743063652aed802d99ea8b5deac2ec3c.zip |
Move request parsing related code to ActionController::RequestParser
Diffstat (limited to 'actionpack/lib/action_controller/url_encoded_pair_parser.rb')
-rw-r--r-- | actionpack/lib/action_controller/url_encoded_pair_parser.rb | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/url_encoded_pair_parser.rb b/actionpack/lib/action_controller/url_encoded_pair_parser.rb new file mode 100644 index 0000000000..bea96c711d --- /dev/null +++ b/actionpack/lib/action_controller/url_encoded_pair_parser.rb @@ -0,0 +1,95 @@ +module ActionController + class UrlEncodedPairParser < StringScanner #:nodoc: + 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 + push top.last + value = top[key] + end + else + top << 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 + + return value + 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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