git-svn-id: svn://toshia.dip.jp/mikutter/trunk@55 03aab468-d3d2-4883-8b12-f661bbf03fa8

1 files changed, 56 insertions, 0 deletions

diff --git a/core/messageconverters.rb b/core/messageconverters.rb
new file mode 100644
index 00000000..bbccc9bf
--- /dev/null
+++ b/core/messageconverters.rb
@@ -0,0 +1,56 @@
+class MessageConverters
+  @@ring = []
+
+  def self.inherited(klass)
+    self.append(klass.new)
+  end
+
+  def self.append(klass)
+    @@ring = @@ring.push(klass)
+  end
+
+  def self.shrink_url_all(text)
+    urls = text.matches(shrinkable_url_regexp)
+    return text if(urls.empty?)
+    table = self.shrink_url(urls)
+    text.gsub(shrinkable_url_regexp){ |k| table[k] } if table
+  end
+
+  def self.shrink_url(url)
+    shrinked, redandancy = *url.partition{ |item|
+      self.shrinked_url?(item) }
+    if not redandancy.empty?
+      @@ring.each{ |shrinker|
+        r = shrinker.shrink_url(redandancy)
+        return r.update(Hash[*shrinked.zip(shrinked)]) if r }
+    end
+    Hash[url.zip(url)]
+  end
+
+  def self.shrinkable_url_regexp
+    URI.regexp(['http','https'])
+  end
+
+  def self.shrinked_url?(url)
+    @@ring.any?{ |shrinker|
+      shrinker.shrinked_url?(url) }
+  end
+
+  def shrink_url(url)
+    nil
+  end
+
+  def shrinked_url?(url)
+    nil
+  end
+
+  # no override follow
+
+  def shrink_url_ifnecessary(url)
+    if shrinked_url?(url)
+      url
+    else
+      shrink_url(url)
+    end
+  end
+end