From fe5efa597b000ef8850a2b8f937d4729328d7ed9 Mon Sep 17 00:00:00 2001
From: TJ Holowaychuk <tj@vision-media.ca>
Date: Sat, 19 Nov 2011 21:40:12 -0800
Subject: [PATCH] Added utils.parseAccepts(str)

---
 lib/utils.js  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 test/utils.js | 28 ++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/lib/utils.js b/lib/utils.js
index d4418379..5655452c 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -60,6 +60,52 @@ exports.miniMarkdown = function(str){
     .replace(/\[([^\]]+)\]\(([^)]+)\)/g, '<a href="$2">$1</a>');
 };
 
+/**
+ * Parse accepts `str`, returning an
+ * object with `.type` and `.quality`.
+ *
+ * @param {Type} name
+ * @return {Type}
+ * @api public
+ */
+
+exports.parseAccepts = function(str){
+  return str
+    .split(/ *, */)
+    .map(type)
+    .sort(quality);
+};
+
+/**
+ * Parse type `str` returning an
+ * object with `.type` and `.quality`.
+ *
+ * @param {String} str
+ * @return {Object}
+ * @api private
+ */
+
+function type(str) {
+  var parts = str.split(/ *; */)
+    , type = parts[0];
+
+  var q = parts[1]
+    ? parseFloat(parts[1].split(/ *= */)[1])
+    : 1;
+
+  return { type: type, quality: q };
+}
+
+/**
+ * Sort by quality.
+ *
+ * @api private
+ */
+
+function quality(a, b) {
+  return b.quality - a.quality;
+}
+
 /**
  * Escape special characters in the given string of html.
  *
diff --git a/test/utils.js b/test/utils.js
index 4ddb7d5d..c8a2c0a3 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -28,4 +28,32 @@ describe('utils.escape(html)', function(){
     utils.escape('<script>foo & "bar"')
       .should.equal('&lt;script&gt;foo &amp; &quot;bar&quot;')
   })
+})
+
+describe('utils.parseAccepts(str)', function(){
+  it('should default quality to 1', function(){
+    utils.parseAccepts('text/html')
+      .should.eql([{ type: 'text/html', quality: 1 }]);
+  })
+  
+  it('should parse qvalues', function(){
+    utils.parseAccepts('text/html; q=0.5')
+      .should.eql([{ type: 'text/html', quality: 0.5 }]);
+
+    utils.parseAccepts('text/html; q=.2')
+      .should.eql([{ type: 'text/html', quality: 0.2 }]);
+  })
+  
+  it('should work with messed up whitespace', function(){
+    utils.parseAccepts('text/html   ;  q =   .2')
+      .should.eql([{ type: 'text/html', quality: 0.2 }]);
+  })
+  
+  it('should sort by quality', function(){
+    var str = 'text/plain;q=.2, application/json, text/html;q=0.5';
+    var arr = utils.parseAccepts(str);
+    arr[0].type.should.equal('application/json');
+    arr[1].type.should.equal('text/html');
+    arr[2].type.should.equal('text/plain');
+  })
 })
\ No newline at end of file