Add support for processing 'x-ms-parameterized-host' extension.

lib/types/parameter.js

@@ -173,7 +173,14 @@ Parameter.prototype.getValue = function (req) {
       throw new Error('req.url must be provided for \'path\' parameters');
     }
 
-    pathMatch = this.pathObject.regexp.exec(parseUrl(req.url).pathname);
+    var urlObj = parseUrl(req.url);
+    if (this.pathObject.hostTemplate) {
+      // hostname needs to be a part of the data for doing the regex match while processing
+      // x-ms-parameterized-host extension.
+      pathMatch = this.pathObject.regexp.exec(urlObj.hostname + urlObj.pathname);
+    } else {
+      pathMatch = this.pathObject.regexp.exec(urlObj.pathname);
+    }
 
     if (pathMatch) {
       // decode URI component here to avoid issues with encoded slashes

lib/types/path.js

@@ -70,6 +70,14 @@ function Path (api, path, definition, definitionFullyResolved, pathToDefinition)
     basePathPrefix = basePathPrefix.substring(0, basePathPrefix.length - 1);
   }
 
+  // Process 'x-ms-parameterized-host' extension if present.
+  var xmsParameterizedHost = api.definitionFullyResolved['x-ms-parameterized-host'];
+  var hostTemplate = '';
+  if (xmsParameterizedHost && xmsParameterizedHost.hostTemplate) {
+    hostTemplate = xmsParameterizedHost.hostTemplate;
+  }
+  this.hostTemplate = hostTemplate;
+
   // Assign local properties
   this.api = api;
   this.definition = definition;
@@ -77,7 +85,10 @@ function Path (api, path, definition, definitionFullyResolved, pathToDefinition)
   this.path = path;
   this.pathToDefinition = pathToDefinition;
   this.ptr = JsonRefs.pathToPtr(pathToDefinition);
-  this.regexp = pathToRegexp(basePathPrefix + path.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, ''), {sensitive: true});
+  var processedPath = hostTemplate.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, '')
+     + basePathPrefix
+     + path.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, '')
+  this.regexp = pathToRegexp(processedPath, {sensitive: true});
 
   // Whenever the path property is set, the regexp should also be updated accordingly.
   Object.defineProperty(this, 'path', {
@@ -86,7 +97,10 @@ function Path (api, path, definition, definitionFullyResolved, pathToDefinition)
     },
     set: function (value) {
       path = value;
-      this.regexp = pathToRegexp(basePathPrefix + path.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, ''), {sensitive: true});
+      processedPath = hostTemplate.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, '')
+         + basePathPrefix
+         + path.replace(/\(/g, '\\(').replace(/\)/g, '\\)').replace(/\{/g, ':').replace(/\}/g, '');
+      this.regexp = pathToRegexp(processedPath, {sensitive: true});
     }
   });