pattern replacing is working

lib/restfulie/client/feature/open_search/pattern_matcher.rb

@@ -0,0 +1,24 @@
+module Restfulie::Client::Feature::OpenSearch
+
+  class PatternMatcher
+
+    def match(params, pattern)
+      params = params.collect do |key, value|
+        [key, value]
+      end
+      pattern = params.inject(pattern) do |pattern, p|
+        what = "{#{p[0]}}"
+        if pattern[what]
+          pattern[what]= "#{p[1]}"
+        end
+        what = "{#{p[0]}?}"
+        if pattern[what]
+          pattern[what]= "#{p[1]}"
+        end
+        pattern
+      end
+    end
+
+  end
+
+end

lib/restfulie/common/representation/open_search/descriptor.rb

@@ -0,0 +1,32 @@
+class Restfulie::Common::Representation::OpenSearch::Descriptor
+
+  def initialize(hash)
+    @hash = hash["OpenSearchDescription"]
+  end
+
+  def urls
+    uris = @hash["Url"]
+    uris.kind_of?(Array) ? uris : [uris]
+  end
+
+  def use(content_type)
+    uri = urls.find do |url|
+      url["type"]==content_type
+    end
+    return nil if uri.nil?
+
+    base_uri, params_pattern = extract_uri(uri)
+    Restfulie.at(base_uri).open_search.with_pattern(params_pattern)
+  end
+
+  private
+  def extract_uri(uri)
+    uri = uri["template"]
+    interrogation = uri.index("?")
+    params = uri[interrogation+1..uri.size]
+    base_uri = uri[0..interrogation-1]
+    [base_uri, params]
+  end
+
+end
+

spec/unit/client/feature/open_search/pattern_matcher_spec.rb

@@ -0,0 +1,15 @@
+require File.expand_path(File.dirname(__FILE__) + '/../../../spec_helper')
+
+describe Restfulie::Client::Feature::OpenSearch::PatternMatcher do
+
+  context "matching patterns" do
+
+    it "should unmarshall opensearch xml descriptions" do
+      pattern = "q={searchTerms}&pw={startPage?}&format=atom"
+      matcher = Restfulie::Client::Feature::OpenSearch::PatternMatcher.new
+      matcher.match({:searchTerms => 12, :startPage => 13},pattern).should == "q=12&pw=13&format=atom"
+    end
+
+  end
+
+end