Add loose mode

Author: sheerun

index.js

@@ -28,7 +28,9 @@ function parse(al){
         });
 }
 
-function pick(supportedLanguages, acceptLanguage){
+function pick(supportedLanguages, acceptLanguage, options){
+    options = options || {};
+
     if (!supportedLanguages || !supportedLanguages.length || !acceptLanguage) {
         return null;
     }
@@ -58,8 +60,8 @@ function pick(supportedLanguages, acceptLanguage){
             var supportedScript = supported[j].script ? supported[j].script.toLowerCase() : supported[j].script;
             var supportedRegion = supported[j].region ? supported[j].region.toLowerCase() : supported[j].region;
             if (langCode === supportedCode &&
-              (!langScript || langScript === supportedScript) &&
-              (!langRegion || langRegion === supportedRegion)) {
+              (options.loose || !langScript || langScript === supportedScript) &&
+              (options.loose  || !langRegion || langRegion === supportedRegion)) {
                 return supportedLanguages[j];
             }
         }

tests/tests.js

@@ -144,4 +144,19 @@ describe('accept-language#pick()', function(){
         var result = parser.pick(['en']);
         assert.equal(result, null);
     });
+
+    it('by default should be strict when selecting language', function(){
+        var result = parser.pick(['en', 'pl'], 'en-US;q=0.6');
+        assert.equal(result, null);
+    });
+
+    it('can select language loosely with an option', function(){
+        var result = parser.pick(['en', 'pl'], 'en-US;q=0.6', { loose: true });
+        assert.equal(result, 'en');
+    });
+
+    it('selects most matching language in loose mode', function(){
+        var result = parser.pick(['en-US', 'en', 'pl'], 'en-US;q=0.6', { loose: true });
+        assert.equal(result, 'en-US');
+    });
 });