initial commit (work in progress)

request/request.js

@@ -0,0 +1,114 @@
+"use strict"
+
+var buildQueryString = require("../querystring/build")
+
+module.exports = function($window, Promise) {
+	var callbackCount = 0
+
+	function ajax(args) {
+		return new Promise(function(resolve, reject) {
+			var useBody = args.useBody != null ? args.useBody : args.method !== "GET" && args.method !== "TRACE"
+			
+			if (typeof args.serialize !== "function") args.serialize = JSON.stringify
+			if (typeof args.deserialize !== "function") args.deserialize = deserialize
+			if (typeof args.extract !== "function") args.extract = extract
+			
+			args.url = interpolate(args.url, args.data)
+			if (useBody) args.data = args.serialize(args.data)
+			else args.url = assemble(args.url, args.data)
+			
+			var xhr = new $window.XMLHttpRequest()
+			xhr.open(args.method, args.url, args.async || true, args.user, args.password)
+			
+			if (args.serialize === JSON.stringify && useBody) {
+				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
+			}
+			if (args.deserialize === deserialize) {
+				xhr.setRequestHeader("Accept", "application/json, text/*")
+			}
+			
+			if (typeof args.config === "function") xhr = args.config(xhr, args) || xhr
+			
+			xhr.onreadystatechange = function() {
+				if (xhr.readyState === 4) {
+					try {
+						var response = args.deserialize(args.extract(xhr, args))
+						if (xhr.status >= 200 && xhr.status < 300) {
+							if (typeof args.type === "function") {
+								if (response instanceof Array) {
+									for (var i = 0; i < response.length; i++) {
+										response[i] = new args.type(response[i])
+									}
+								}
+								else response = new args.type(response[i])
+							}
+							
+							resolve(response)
+						}
+						else reject(new Error(xhr.responseText))
+					}
+					catch (e) {
+						reject(e)
+					}
+				}
+			}
+			
+			if (useBody) xhr.send(args.data)
+			else xhr.send()
+		})
+	}
+
+	function jsonp(args) {
+		return new Promise(function(resolve, reject) {
+			var callbackKey = "_mithril_" + Math.round(Math.random() * 1e16) + "_" + callbackCount++
+			var script = $window.document.createElement("script")
+			$window[callbackKey] = function(data) {
+				script.parentNode.removeChild(script)
+				resolve(data)
+				$window[callbackKey] = undefined
+			}
+			script.onerror = function(e) {
+				script.parentNode.removeChild(script)
+				reject(new Error("JSONP request failed"))
+				$window[callbackKey] = undefined
+			}
+			if (args.data == null) args.data = {}
+			args.url = interpolate(args.url, args.data)
+			args.data[args.callbackKey || "callback"] = callbackKey
+			script.src = assemble(args.url, args.data)
+			$window.document.documentElement.appendChild(script)
+		})
+	}
+
+	function interpolate(url, data) {
+		if (data == null) return url
+		
+		var tokens = url.match(/:[^\/]+/gi) || []
+		for (var i = 0; i < tokens.length; i++) {
+			var key = tokens[i].slice(1)
+			if (data[key] != null) {
+				url = url.replace(tokens[i], data[key])
+				delete data[key]
+			}
+		}
+		return url
+	}
+
+	function assemble(url, data) {
+		var querystring = buildQueryString(data)
+		if (querystring !== "") {
+			var prefix = url.indexOf("?") < 0 ? "?" : "&"
+			url += prefix + querystring
+		}
+		return url
+	}
+
+	function deserialize(data) {
+		try {return data !== "" ? JSON.parse(data) : null}
+		catch (e) {throw new Error(data)}
+	}
+
+	function extract(xhr) {return xhr.responseText}
+	
+	return {ajax: ajax, jsonp: jsonp}
+}