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kernel-language.js 14 KB

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  1. /* ====================================================================
  2. |
  3. | Amber Smalltalk
  4. | http://amber-lang.net
  5. |
  6. ======================================================================
  7. ======================================================================
  8. |
  9. | Copyright (c) 2010-2014
  10. | Nicolas Petton <petton.nicolas@gmail.com>
  11. |
  12. | Copyright (c) 2012-2016
  13. | The Amber team https://lolg.it/org/amber/members
  14. | Amber contributors (see /CONTRIBUTORS)
  15. |
  16. | Amber is released under the MIT license
  17. |
  18. | Permission is hereby granted, free of charge, to any person obtaining
  19. | a copy of this software and associated documentation files (the
  20. | 'Software'), to deal in the Software without restriction, including
  21. | without limitation the rights to use, copy, modify, merge, publish,
  22. | distribute, sublicense, and/or sell copies of the Software, and to
  23. | permit persons to whom the Software is furnished to do so, subject to
  24. | the following conditions:
  25. |
  26. | The above copyright notice and this permission notice shall be
  27. | included in all copies or substantial portions of the Software.
  28. |
  29. | THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
  30. | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31. | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  32. | IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  33. | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  34. | TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  35. | SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  36. |
  37. ==================================================================== */
  38. //jshint eqnull:true
  39. define(['./compatibility'], function () {
  40. "use strict";
  41. function inherits (child, parent) {
  42. child.prototype = Object.create(parent.prototype, {
  43. constructor: {
  44. value: child,
  45. enumerable: false, configurable: true, writable: true
  46. }
  47. });
  48. return child;
  49. }
  50. function defineMethod (klass, name, method) {
  51. Object.defineProperty(klass.prototype, name, {
  52. value: method,
  53. enumerable: false, configurable: true, writable: true
  54. });
  55. }
  56. TraitsBrik.deps = ["behaviors", "composition", "arraySet", "root"];
  57. function TraitsBrik (brikz, st) {
  58. var coreFns = brikz.root.coreFns;
  59. var SmalltalkBehaviorBody = brikz.behaviors.BehaviorBody;
  60. var setupMethods = brikz.composition.setupMethods;
  61. var traitMethodChanged = brikz.composition.traitMethodChanged;
  62. var buildBehaviorBody = brikz.behaviors.buildBehaviorBody;
  63. var addElement = brikz.arraySet.addElement;
  64. var removeElement = brikz.arraySet.removeElement;
  65. function SmalltalkTrait () {
  66. }
  67. coreFns.Trait = inherits(SmalltalkTrait, SmalltalkBehaviorBody);
  68. SmalltalkTrait.prototype.trait = true;
  69. defineMethod(SmalltalkTrait, "toString", function () {
  70. return 'Smalltalk Trait ' + this.className;
  71. });
  72. defineMethod(SmalltalkTrait, "added", function () {
  73. if (st._traitAdded) st._traitAdded(this);
  74. });
  75. defineMethod(SmalltalkTrait, "removed", function () {
  76. if (st._traitRemoved) st._traitRemoved(this);
  77. });
  78. defineMethod(SmalltalkTrait, "methodAdded", function (method) {
  79. var self = this;
  80. this.traitUsers.forEach(function (each) {
  81. traitMethodChanged(method.selector, method, self, each);
  82. });
  83. if (st._traitMethodAdded) st._traitMethodAdded(method, this);
  84. });
  85. defineMethod(SmalltalkTrait, "methodRemoved", function (method) {
  86. var self = this;
  87. this.traitUsers.forEach(function (each) {
  88. traitMethodChanged(method.selector, null, self, each);
  89. });
  90. if (st._traitMethodRemoved) st._traitMethodRemoved(method, this);
  91. });
  92. defineMethod(SmalltalkTrait, "addUser", function (behaviorBody) {
  93. addElement(this.traitUsers, behaviorBody);
  94. });
  95. defineMethod(SmalltalkTrait, "removeUser", function (behaviorBody) {
  96. removeElement(this.traitUsers, behaviorBody);
  97. });
  98. function traitBuilder (className) {
  99. return {
  100. className: className,
  101. make: function (pkg) {
  102. var that = new SmalltalkTrait();
  103. that.className = className;
  104. that.pkg = pkg;
  105. that.traitUsers = [];
  106. setupMethods(that);
  107. return that;
  108. },
  109. updateExisting: function (trait, pkg) {
  110. if (pkg) trait.pkg = pkg;
  111. }
  112. };
  113. }
  114. st.addTrait = function (className, pkgName) {
  115. return buildBehaviorBody(pkgName, traitBuilder(className));
  116. };
  117. }
  118. ClassesBrik.deps = ["root", "behaviors", "composition", "arraySet", "smalltalkGlobals"];
  119. function ClassesBrik (brikz, st) {
  120. var SmalltalkRoot = brikz.root.Root;
  121. var coreFns = brikz.root.coreFns;
  122. var globals = brikz.smalltalkGlobals.globals;
  123. var SmalltalkBehaviorBody = brikz.behaviors.BehaviorBody;
  124. var buildBehaviorBody = brikz.behaviors.buildBehaviorBody;
  125. var setupMethods = brikz.composition.setupMethods;
  126. var removeBehaviorBody = brikz.behaviors.removeBehaviorBody;
  127. var addElement = brikz.arraySet.addElement;
  128. var removeElement = brikz.arraySet.removeElement;
  129. function SmalltalkBehavior () {
  130. }
  131. function SmalltalkClass () {
  132. }
  133. function SmalltalkMetaclass () {
  134. }
  135. coreFns.Behavior = inherits(SmalltalkBehavior, SmalltalkBehaviorBody);
  136. coreFns.Class = inherits(SmalltalkClass, SmalltalkBehavior);
  137. coreFns.Metaclass = inherits(SmalltalkMetaclass, SmalltalkBehavior);
  138. // Fake root class of the system.
  139. // Effective superclass of all classes created with `nil subclass: ...`.
  140. var nilAsClass = this.nilAsClass = {fn: SmalltalkRoot, a$cls: {fn: SmalltalkClass}, klass: {fn: SmalltalkClass}};
  141. SmalltalkMetaclass.prototype.meta = true;
  142. defineMethod(SmalltalkClass, "toString", function () {
  143. return 'Smalltalk ' + this.className;
  144. });
  145. defineMethod(SmalltalkMetaclass, "toString", function () {
  146. return 'Smalltalk Metaclass ' + this.instanceClass.className;
  147. });
  148. defineMethod(SmalltalkClass, "added", function () {
  149. addSubclass(this);
  150. if (st._classAdded) st._classAdded(this);
  151. });
  152. defineMethod(SmalltalkClass, "removed", function () {
  153. if (st._classRemoved) st._classRemoved(this);
  154. removeSubclass(this);
  155. });
  156. defineMethod(SmalltalkBehavior, "methodAdded", function (method) {
  157. if (st._methodAdded) st._methodAdded(method, this);
  158. });
  159. defineMethod(SmalltalkBehavior, "methodRemoved", function (method) {
  160. if (st._methodRemoved) st._methodRemoved(method, this);
  161. });
  162. this.bootstrapHierarchy = function () {
  163. var nilSubclasses = [globals.ProtoObject];
  164. nilAsClass.a$cls = nilAsClass.klass = globals.Class;
  165. nilSubclasses.forEach(function (each) {
  166. each.a$cls.superclass = globals.Class;
  167. addSubclass(each.a$cls);
  168. });
  169. };
  170. /* Smalltalk class creation. A class is an instance of an automatically
  171. created metaclass object. Newly created classes (not their metaclass)
  172. should be added to the system, see smalltalk.addClass().
  173. Superclass linking is *not* handled here, see api.initialize() */
  174. function classBuilder (className, superclass, iVarNames, fn) {
  175. var logicalSuperclass = superclass;
  176. if (superclass == null || superclass.a$nil) {
  177. superclass = nilAsClass;
  178. logicalSuperclass = null;
  179. }
  180. function klass (pkg) {
  181. var that = metaclass().instanceClass;
  182. that.superclass = logicalSuperclass;
  183. that.fn = fn || inherits(function () {
  184. }, superclass.fn);
  185. that.iVarNames = iVarNames || [];
  186. that.className = className;
  187. that.pkg = pkg;
  188. that.subclasses = [];
  189. setupMethods(that);
  190. return that;
  191. }
  192. function metaclass () {
  193. var that = new SmalltalkMetaclass();
  194. that.superclass = superclass.a$cls;
  195. that.fn = inherits(function () {
  196. }, that.superclass.fn);
  197. that.iVarNames = [];
  198. that.instanceClass = new that.fn();
  199. wireKlass(that);
  200. setupMethods(that);
  201. return that;
  202. }
  203. return {
  204. className: className,
  205. make: klass,
  206. updateExisting: function (klass, pkg) {
  207. if (klass.superclass == logicalSuperclass && (!fn || fn === klass.fn)) {
  208. if (iVarNames) klass.iVarNames = iVarNames;
  209. if (pkg) klass.pkg = pkg;
  210. } else throw new Error("Incompatible change of class: " + klass.className);
  211. }
  212. };
  213. }
  214. function wireKlass (klass) {
  215. Object.defineProperty(klass.fn.prototype, "a$cls", {
  216. value: klass,
  217. enumerable: false, configurable: true, writable: true
  218. });
  219. Object.defineProperty(klass.fn.prototype, "klass", {
  220. value: klass,
  221. enumerable: false, configurable: true, writable: true
  222. });
  223. }
  224. this.wireKlass = wireKlass;
  225. /* Add a class to the system, creating a new one if needed.
  226. A Package is lazily created if one with given name does not exist. */
  227. st.addClass = function (className, superclass, iVarNames, pkgName) {
  228. // While subclassing nil is allowed, it might be an error, so
  229. // warn about it.
  230. if (typeof superclass == 'undefined' || superclass && superclass.a$nil) {
  231. console.warn('Compiling ' + className + ' as a subclass of `nil`. A dependency might be missing.');
  232. }
  233. return buildBehaviorBody(pkgName, classBuilder(className, superclass, iVarNames, coreFns[className]));
  234. };
  235. st.removeClass = removeBehaviorBody;
  236. function addSubclass (klass) {
  237. if (klass.superclass) {
  238. addElement(klass.superclass.subclasses, klass);
  239. }
  240. }
  241. function removeSubclass (klass) {
  242. if (klass.superclass) {
  243. removeElement(klass.superclass.subclasses, klass);
  244. }
  245. }
  246. function metaSubclasses (metaclass) {
  247. return metaclass.instanceClass.subclasses
  248. .filter(function (each) {
  249. return !each.meta;
  250. })
  251. .map(function (each) {
  252. return each.a$cls;
  253. });
  254. }
  255. st.metaSubclasses = metaSubclasses;
  256. st.traverseClassTree = function (klass, fn) {
  257. var queue = [klass], sentinel = {};
  258. for (var i = 0; i < queue.length; ++i) {
  259. var item = queue[i];
  260. if (fn(item, sentinel) === sentinel) continue;
  261. var subclasses = item.meta ? metaSubclasses(item) : item.subclasses;
  262. queue.push.apply(queue, subclasses);
  263. }
  264. };
  265. }
  266. NilBrik.deps = ["root"];
  267. function NilBrik (brikz, st) {
  268. var SmalltalkObject = brikz.root.Object;
  269. var coreFns = brikz.root.coreFns;
  270. function SmalltalkNil () {
  271. }
  272. coreFns.UndefinedObject = inherits(SmalltalkNil, SmalltalkObject);
  273. this.nilAsReceiver = new SmalltalkNil();
  274. // Adds an `a$nil` (and legacy `isNil`) property to the `nil` object. When sending
  275. // nil objects from one environment to another, doing
  276. // `anObject == nil` (in JavaScript) does not always answer
  277. // true as the referenced nil object might come from the other
  278. // environment.
  279. Object.defineProperty(this.nilAsReceiver, 'a$nil', {
  280. value: true,
  281. enumerable: false, configurable: false, writable: false
  282. });
  283. Object.defineProperty(this.nilAsReceiver, 'isNil', {
  284. value: true,
  285. enumerable: false, configurable: false, writable: false
  286. });
  287. }
  288. /* Defines asReceiver to be present at load time */
  289. /* (logically it belongs more to PrimitiveBrik) */
  290. AsReceiverBrik.deps = ["nil"];
  291. function AsReceiverBrik (brikz, st) {
  292. var nilAsReceiver = brikz.nil.nilAsReceiver;
  293. /**
  294. * This function is used all over the compiled amber code.
  295. * It takes any value (JavaScript or Smalltalk)
  296. * and returns a proper Amber Smalltalk receiver.
  297. *
  298. * null or undefined -> nilAsReceiver,
  299. * object having Smalltalk signature -> unchanged,
  300. * otherwise wrapped foreign (JS) object
  301. */
  302. this.asReceiver = function (o) {
  303. if (o == null) return nilAsReceiver;
  304. else if (o.a$cls != null) return o;
  305. else return st.wrapJavaScript(o);
  306. };
  307. }
  308. /* Making smalltalk that can load */
  309. function configureWithHierarchy (brikz) {
  310. brikz.traits = TraitsBrik;
  311. brikz.classes = ClassesBrik;
  312. brikz.nil = NilBrik;
  313. brikz.asReceiver = AsReceiverBrik;
  314. brikz.rebuild();
  315. }
  316. return configureWithHierarchy;
  317. });