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node_modules/on-headers/index.js

@@ -7,38 +7,27 @@
 'use strict'
 
 /**
- * Reference to Array slice.
+ * Module exports.
+ * @public
  */
 
-var slice = Array.prototype.slice
+module.exports = onHeaders
 
 /**
- * Execute a listener when a response is about to write headers.
+ * Create a replacement writeHead method.
  *
- * @param {Object} res
- * @return {Function} listener
- * @api public
+ * @param {function} prevWriteHead
+ * @param {function} listener
+ * @private
  */
 
-module.exports = function onHeaders(res, listener) {
-  if (!res) {
-    throw new TypeError('argument res is required')
-  }
-
-  if (typeof listener !== 'function') {
-    throw new TypeError('argument listener must be a function')
-  }
-
-  res.writeHead = createWriteHead(res.writeHead, listener)
-}
-
-function createWriteHead(prevWriteHead, listener) {
-  var fired = false;
+function createWriteHead (prevWriteHead, listener) {
+  var fired = false
 
   // return function with core name and argument list
-  return function writeHead(statusCode) {
+  return function writeHead (statusCode) {
     // set headers from arguments
-    var args = setWriteHeadHeaders.apply(this, arguments);
+    var args = setWriteHeadHeaders.apply(this, arguments)
 
     // fire listener
     if (!fired) {
@@ -52,11 +41,68 @@ function createWriteHead(prevWriteHead, listener) {
       }
     }
 
-    prevWriteHead.apply(this, args);
+    return prevWriteHead.apply(this, args)
   }
 }
 
-function setWriteHeadHeaders(statusCode) {
+/**
+ * Execute a listener when a response is about to write headers.
+ *
+ * @param {object} res
+ * @return {function} listener
+ * @public
+ */
+
+function onHeaders (res, listener) {
+  if (!res) {
+    throw new TypeError('argument res is required')
+  }
+
+  if (typeof listener !== 'function') {
+    throw new TypeError('argument listener must be a function')
+  }
+
+  res.writeHead = createWriteHead(res.writeHead, listener)
+}
+
+/**
+ * Set headers contained in array on the response object.
+ *
+ * @param {object} res
+ * @param {array} headers
+ * @private
+ */
+
+function setHeadersFromArray (res, headers) {
+  for (var i = 0; i < headers.length; i++) {
+    res.setHeader(headers[i][0], headers[i][1])
+  }
+}
+
+/**
+ * Set headers contained in object on the response object.
+ *
+ * @param {object} res
+ * @param {object} headers
+ * @private
+ */
+
+function setHeadersFromObject (res, headers) {
+  var keys = Object.keys(headers)
+  for (var i = 0; i < keys.length; i++) {
+    var k = keys[i]
+    if (k) res.setHeader(k, headers[k])
+  }
+}
+
+/**
+ * Set headers and other properties on the response object.
+ *
+ * @param {number} statusCode
+ * @private
+ */
+
+function setWriteHeadHeaders (statusCode) {
   var length = arguments.length
   var headerIndex = length > 1 && typeof arguments[1] === 'string'
     ? 2
@@ -68,19 +114,12 @@ function setWriteHeadHeaders(statusCode) {
 
   this.statusCode = statusCode
 
-  // the following block is from node.js core
   if (Array.isArray(headers)) {
     // handle array case
-    for (var i = 0, len = headers.length; i < len; ++i) {
-      this.setHeader(headers[i][0], headers[i][1])
-    }
+    setHeadersFromArray(this, headers)
   } else if (headers) {
     // handle object case
-    var keys = Object.keys(headers)
-    for (var i = 0; i < keys.length; i++) {
-      var k = keys[i]
-      if (k) this.setHeader(k, headers[k])
-    }
+    setHeadersFromObject(this, headers)
   }
 
   // copy leading arguments