Add patch for URI decode_www_form

Plus some specs.
This should it make later possible to make Zero work with Ruby 1.8. But
at the moment it only routes to the original decode_www_form method, if
it exists. Otherwise it returns an empty Array. So this will still fail
on the 1.8 versions at the moment.

lib/zero.rb

@@ -1,6 +1,7 @@
 if RUBY_VERSION <= '1.9'
   require 'backports'
 end
+require 'zero/patches/uri'
 
 module Zero
   require 'zero/controller'

lib/zero/patches/uri.rb

@@ -0,0 +1,45 @@
+module URI
+
+    # Gets a query string and splits it into its key value pairs.
+    # If URI already supports this functionality (decode_www_form on Ruby 1.9+),
+    # it will use this. Else ... nothing at the moment.
+    #
+    # @param [String] query The query string
+    # @return [Array] Parsed query
+    #
+    def self.parse_query_string(query)
+      # Call the original decode_www_form method on ruby 1.9+
+      if URI::respond_to? 'decode_www_form'
+        return self.decode_www_form query
+      end
+
+      # else split the query self
+      return []
+    end
+
+=begin
+    WFKV_ = '(?:[^%#=;&]*(?:%\h\h[^%#=;&]*)*)'
+
+    def self.decode_www_form(str, enc= nil)
+      return [] if str.empty?
+      unless /\A#{WFKV_}=#{WFKV_}(?:[;&]#{WFKV_}=#{WFKV_})*\z/ =~ str
+        raise ArgumentError,
+          "invalid data of application/x-www-form-urlencoded (#{str})"
+      end
+      ary = []
+      $&.scan(/([^=;&]+)=([^;&]*)/) do
+        ary << [
+          decode_www_form_component($1, enc),
+          decode_www_form_component($2, enc)
+        ]
+      end
+      ary
+    end
+
+    def self.decode_www_form_component(str, enc= nil)
+      raise ArgumentError, "invalid %-encoding (#{str})" unless /\A[^%]*(?:%\h\h[^%]*)*\z/ =~ str
+      str.gsub(/\+|%\h\h/, TBLDECWWWCOMP_).force_encoding(enc)
+    end
+=end
+
+end

spec/unit/uri/parse_query_string_spec.rb

@@ -0,0 +1,111 @@
+# encoding: UTF-8
+
+require 'spec_helper'
+
+describe URI, '#parse_query_string' do
+
+  it 'seperates parameter into an array' do
+    result = URI::parse_query_string("foo=bar&bar=foo")
+
+    result.should eq([['foo', 'bar'], ['bar', 'foo']])
+  end
+
+  it 'can handle more than two equal parameter names' do
+    result = URI::parse_query_string("foo=bar1&foo=bar2")
+
+    result.should eq([['foo', 'bar1'], ['foo', 'bar2']])
+  end
+
+  it 'can handle whitespaces in query string' do
+    result = URI::parse_query_string("foo=bar&bar=bar%20foo")
+
+    result.should eq([['foo', 'bar'], ['bar', 'bar foo']])
+  end
+
+  it 'accepts semi-colons as seperators' do
+    result = URI::parse_query_string("foo=bar;bar=foo")
+
+    result.should eq([['foo', 'bar'], ['bar', 'foo']])
+  end
+
+  it 'seperates & and ; mixed queries properly' do
+    result = URI::parse_query_string("foo=bar&bar=foo;baz=foo")
+
+    result.should eq([['foo', 'bar'], ['bar', 'foo'], ['baz', 'foo']])
+  end
+
+  it 'does not accept only a normal string as query string' do
+    expect{
+      result = URI::parse_query_string("foo")
+
+      # does not work, probably should?
+      #result.should eq([['foo', '']])
+    }.to raise_error(
+      ArgumentError,
+      "invalid data of application/x-www-form-urlencoded (foo)"
+    )
+  end
+
+  it 'accepts empty values' do
+      result = URI::parse_query_string("foo=bar&bar=&baz=foo")
+
+      result.should eq([['foo', 'bar'], ['bar', ''], ['baz', 'foo']])
+  end
+
+  it 'understands plus as whitespace' do
+    result = URI::parse_query_string("foo=bar&bar=bar+foo")
+
+    result.should eq([['foo', 'bar'], ['bar', 'bar foo']])
+  end
+
+  it 'does not accept whitespaces in query string' do
+    result = URI::parse_query_string("foo=bar&bar=bar foo&baz=foo")
+
+    # Works, it probably shouldn't?
+    result.should eq([['foo', 'bar'], ['bar', 'bar foo'], ['baz', 'foo']])
+  end
+
+  it 'can handle non ascii letters in query string' do
+    result = URI::parse_query_string("foo=bär&bar=föö")
+
+    # Works, but it maybe shouldn't?
+    result.should eq([['foo', 'bär'], ['bar', 'föö']])
+  end
+
+  it 'can handle escaped non ascii letters in query string' do
+    result = URI::parse_query_string("foo=b%C3%A4r&bar=f%C3%B6%C3%B6")
+
+    result.should eq([['foo', 'bär'], ['bar', 'föö']])
+  end
+
+  it 'accepts - in query string' do
+    result = URI::parse_query_string("foo-bar=bar&bar=foo-bar")
+
+    result.should eq([['foo-bar', 'bar'], ['bar', 'foo-bar']])
+  end
+
+  it 'accepts . in query string' do
+    result = URI::parse_query_string("foo.bar=bar&bar=foo.bar")
+
+    result.should eq([['foo.bar', 'bar'], ['bar', 'foo.bar']])
+  end
+
+  it 'accepts ~ in query string' do
+    result = URI::parse_query_string("foo~bar=bar&bar=foo~bar")
+
+    result.should eq([['foo~bar', 'bar'], ['bar', 'foo~bar']])
+  end
+
+  it 'accepts _ in query string' do
+    result = URI::parse_query_string("foo_bar=bar&bar=foo_bar")
+
+    result.should eq([['foo_bar', 'bar'], ['bar', 'foo_bar']])
+  end
+
+  it 'handles [ ] in query string' do
+    result = URI::parse_query_string("foo[]=foo&foo[]=bar")
+
+    result.should eq([['foo[]', 'foo'], ['foo[]', 'bar']])
+  end
+
+end