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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) 2012-2017
  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' /* TODO remove */], 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 SmalltalkObject = brikz.root.Object;
  60. var setupMethods = brikz.composition.setupMethods;
  61. var traitMethodChanged = brikz.composition.traitMethodChanged;
  62. var buildTraitOrClass = brikz.behaviors.buildTraitOrClass;
  63. var addElement = brikz.arraySet.addElement;
  64. var removeElement = brikz.arraySet.removeElement;
  65. function SmalltalkTrait () {
  66. }
  67. coreFns.Trait = inherits(SmalltalkTrait, SmalltalkObject);
  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 (traitOrBehavior) {
  93. addElement(this.traitUsers, traitOrBehavior);
  94. });
  95. defineMethod(SmalltalkTrait, "removeUser", function (traitOrBehavior) {
  96. removeElement(this.traitUsers, traitOrBehavior);
  97. });
  98. function traitBuilder (className) {
  99. return {
  100. className: className,
  101. make: function () {
  102. var that = new SmalltalkTrait();
  103. that.className = className;
  104. that.traitUsers = [];
  105. setupMethods(that);
  106. return that;
  107. },
  108. updateExisting: function (trait) {
  109. }
  110. };
  111. }
  112. st.addTrait = function (className, pkgName) {
  113. return buildTraitOrClass(pkgName, traitBuilder(className));
  114. };
  115. }
  116. ClassesBrik.deps = ["root", "behaviors", "composition", "arraySet", "smalltalkGlobals"];
  117. function ClassesBrik (brikz, st) {
  118. var SmalltalkRoot = brikz.root.Root;
  119. var coreFns = brikz.root.coreFns;
  120. var globals = brikz.smalltalkGlobals.globals;
  121. var SmalltalkObject = brikz.root.Object;
  122. var buildTraitOrClass = brikz.behaviors.buildTraitOrClass;
  123. var setupMethods = brikz.composition.setupMethods;
  124. var removeTraitOrClass = brikz.behaviors.removeTraitOrClass;
  125. var addElement = brikz.arraySet.addElement;
  126. var removeElement = brikz.arraySet.removeElement;
  127. function SmalltalkBehavior () {
  128. }
  129. function SmalltalkClass () {
  130. }
  131. function SmalltalkMetaclass () {
  132. }
  133. coreFns.Behavior = inherits(SmalltalkBehavior, SmalltalkObject);
  134. coreFns.Class = inherits(SmalltalkClass, SmalltalkBehavior);
  135. coreFns.Metaclass = inherits(SmalltalkMetaclass, SmalltalkBehavior);
  136. // Fake root class of the system.
  137. // Effective superclass of all classes created with `nil subclass: ...`.
  138. var nilAsClass = this.nilAsClass = {
  139. fn: SmalltalkRoot,
  140. a$cls: {fn: SmalltalkClass},
  141. klass: {fn: SmalltalkClass}
  142. };
  143. SmalltalkMetaclass.prototype.meta = true;
  144. defineMethod(SmalltalkClass, "toString", function () {
  145. return 'Smalltalk ' + this.className;
  146. });
  147. defineMethod(SmalltalkMetaclass, "toString", function () {
  148. return 'Smalltalk Metaclass ' + this.instanceClass.className;
  149. });
  150. defineMethod(SmalltalkClass, "added", function () {
  151. addSubclass(this);
  152. if (st._classAdded) st._classAdded(this);
  153. });
  154. defineMethod(SmalltalkClass, "removed", function () {
  155. if (st._classRemoved) st._classRemoved(this);
  156. removeSubclass(this);
  157. });
  158. defineMethod(SmalltalkBehavior, "methodAdded", function (method) {
  159. if (st._behaviorMethodAdded) st._behaviorMethodAdded(method, this);
  160. });
  161. defineMethod(SmalltalkBehavior, "methodRemoved", function (method) {
  162. if (st._behaviorMethodRemoved) st._behaviorMethodRemoved(method, this);
  163. });
  164. this.bootstrapHierarchy = function () {
  165. var nilSubclasses = [globals.ProtoObject];
  166. nilAsClass.a$cls = nilAsClass.klass = globals.Class;
  167. nilSubclasses.forEach(function (each) {
  168. each.a$cls.superclass = globals.Class;
  169. addSubclass(each.a$cls);
  170. });
  171. };
  172. /* Smalltalk class creation. A class is an instance of an automatically
  173. created metaclass object. Newly created classes (not their metaclass)
  174. should be added to the system, see smalltalk.addClass().
  175. Superclass linking is *not* handled here, see api.initialize() */
  176. function classBuilder (className, superclass, iVarNames, fn) {
  177. var logicalSuperclass = superclass;
  178. if (superclass == null || superclass.a$nil) {
  179. superclass = nilAsClass;
  180. logicalSuperclass = null;
  181. }
  182. function klass () {
  183. var that = metaclass().instanceClass;
  184. that.superclass = logicalSuperclass;
  185. that.fn = fn || inherits(function () {
  186. }, superclass.fn);
  187. that.iVarNames = iVarNames || [];
  188. that.className = className;
  189. that.subclasses = [];
  190. setupMethods(that);
  191. return that;
  192. }
  193. function metaclass () {
  194. var that = new SmalltalkMetaclass();
  195. that.superclass = superclass.a$cls;
  196. that.fn = inherits(function () {
  197. }, that.superclass.fn);
  198. that.iVarNames = [];
  199. that.instanceClass = new that.fn();
  200. wireKlass(that);
  201. setupMethods(that);
  202. return that;
  203. }
  204. return {
  205. className: className,
  206. make: klass,
  207. updateExisting: function (klass) {
  208. if (klass.superclass == logicalSuperclass && (!fn || fn === klass.fn)) {
  209. if (iVarNames) klass.iVarNames = iVarNames;
  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 buildTraitOrClass(pkgName, classBuilder(className, superclass, iVarNames, coreFns[className]));
  234. };
  235. st.removeClass = removeTraitOrClass;
  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$cls;
  253. });
  254. }
  255. st.metaSubclasses = metaSubclasses;
  256. st.traverseClassTree = function (klass, fn) {
  257. var queue = [klass], sentinel = {};
  258. for (var i = 0; i < queue.length; ++i) {
  259. var item = queue[i];
  260. if (fn(item, sentinel) === sentinel) continue;
  261. var subclasses = item.meta ? metaSubclasses(item) : item.subclasses;
  262. queue.push.apply(queue, subclasses);
  263. }
  264. };
  265. }
  266. NilBrik.deps = ["root"];
  267. function NilBrik (brikz, st) {
  268. var SmalltalkObject = brikz.root.Object;
  269. var coreFns = brikz.root.coreFns;
  270. function SmalltalkNil () {
  271. }
  272. coreFns.UndefinedObject = inherits(SmalltalkNil, SmalltalkObject);
  273. this.nilAsReceiver = new SmalltalkNil();
  274. this.nilAsValue = this.nilAsReceiver; // TODO null
  275. // Adds an `a$nil` (and legacy `isNil`) property to the `nil` object. When sending
  276. // nil objects from one environment to another, doing
  277. // `anObject == nil` (in JavaScript) does not always answer
  278. // true as the referenced nil object might come from the other
  279. // environment.
  280. Object.defineProperty(this.nilAsReceiver, 'a$nil', {
  281. value: true,
  282. enumerable: false, configurable: false, writable: false
  283. });
  284. Object.defineProperty(this.nilAsReceiver, 'isNil', {
  285. value: true,
  286. enumerable: false, configurable: false, writable: false
  287. });
  288. }
  289. /* Defines asReceiver to be present at load time */
  290. /* (logically it belongs more to PrimitiveBrik) */
  291. AsReceiverBrik.deps = ["nil"];
  292. function AsReceiverBrik (brikz, st) {
  293. var nilAsReceiver = brikz.nil.nilAsReceiver;
  294. /**
  295. * This function is used all over the compiled amber code.
  296. * It takes any value (JavaScript or Smalltalk)
  297. * and returns a proper Amber Smalltalk receiver.
  298. *
  299. * null or undefined -> nilAsReceiver,
  300. * object having Smalltalk signature -> unchanged,
  301. * otherwise wrapped foreign (JS) object
  302. */
  303. this.asReceiver = function (o) {
  304. if (o == null) return nilAsReceiver;
  305. else if (o.a$cls != null) return o;
  306. else return st.wrapJavaScript(o);
  307. };
  308. }
  309. /* Making smalltalk that can load */
  310. function configureWithHierarchy (brikz) {
  311. brikz.traits = TraitsBrik;
  312. brikz.classes = ClassesBrik;
  313. brikz.nil = NilBrik;
  314. brikz.asReceiver = AsReceiverBrik;
  315. brikz.rebuild();
  316. }
  317. return configureWithHierarchy;
  318. });