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kernel-fundamentals.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(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 SmalltalkGlobalsBrik (brikz, st) {
  51. // jshint evil:true
  52. var jsGlobals = new Function("return this")();
  53. var globals = Object.create(jsGlobals);
  54. globals.SmalltalkSettings = {};
  55. this.globals = globals;
  56. }
  57. function EventBrik (brikz, st) {
  58. var emit = {};
  59. this.emit = emit;
  60. this.declareEvent = function (event) {
  61. if (!emit[event]) emit[event] = function () {
  62. };
  63. }
  64. }
  65. function RootBrik (brikz, st) {
  66. /* Smalltalk foundational objects */
  67. var coreFns = this.coreFns = {};
  68. /* SmalltalkRoot is the hidden root of the normal Amber hierarchy.
  69. All objects including `ProtoObject` inherit from SmalltalkRoot.
  70. Detached roots (eg. wrapped JS classes like Number or Date)
  71. do not directly inherit from SmalltalkRoot, but employ a workaround.*/
  72. function SmalltalkRoot () {
  73. }
  74. function SmalltalkProtoObject () {
  75. }
  76. function SmalltalkObject () {
  77. }
  78. coreFns.ProtoObject = inherits(SmalltalkProtoObject, SmalltalkRoot);
  79. coreFns.Object = inherits(SmalltalkObject, SmalltalkProtoObject);
  80. this.Root = SmalltalkRoot;
  81. this.Object = SmalltalkObject;
  82. }
  83. SelectorsBrik.deps = ["selectorConversion"];
  84. function SelectorsBrik (brikz, st) {
  85. var selectorSet = Object.create(null);
  86. var selectors = this.selectors = [];
  87. var selectorPairs = this.selectorPairs = [];
  88. this.registerSelector = function (stSelector) {
  89. if (selectorSet[stSelector]) return null;
  90. var jsSelector = st.st2js(stSelector);
  91. selectorSet[stSelector] = true;
  92. selectors.push(stSelector);
  93. var pair = {st: stSelector, js: jsSelector};
  94. selectorPairs.push(pair);
  95. return pair;
  96. };
  97. st.allSelectors = function () {
  98. return selectors;
  99. };
  100. }
  101. function PackagesBrik (brikz, st) {
  102. // TODO remove .packages, have .packageDescriptors
  103. st.packages = {};
  104. /* Add a package load descriptor to the system */
  105. st.addPackage = function (pkgName, properties) {
  106. if (!pkgName) return null;
  107. return st.packages[pkgName] = {
  108. // TODO remove .pkgName, have .name
  109. pkgName: pkgName,
  110. properties: properties
  111. };
  112. };
  113. }
  114. BehaviorsBrik.deps = ["root", "smalltalkGlobals", "arraySet"];
  115. function BehaviorsBrik (brikz, st) {
  116. var globals = brikz.smalltalkGlobals.globals;
  117. var addElement = brikz.arraySet.addElement;
  118. var removeElement = brikz.arraySet.removeElement;
  119. /* Smalltalk classes and traits */
  120. var traitsOrClasses = [];
  121. this.buildTraitOrClass = function (category, builder) {
  122. // TODO remove .className, have .name
  123. var traitOrClass = globals.hasOwnProperty(builder.className) && globals[builder.className];
  124. if (traitOrClass) {
  125. builder.updateExisting(traitOrClass);
  126. } else {
  127. traitOrClass = builder.make();
  128. traitOrClass.category = category;
  129. addTraitOrClass(traitOrClass);
  130. }
  131. return traitOrClass;
  132. };
  133. function addTraitOrClass (traitOrClass) {
  134. globals[traitOrClass.className] = traitOrClass;
  135. addElement(traitsOrClasses, traitOrClass);
  136. traitOrClass.added();
  137. }
  138. function removeTraitOrClass (traitOrClass) {
  139. traitOrClass.removed();
  140. removeElement(traitsOrClasses, traitOrClass);
  141. delete globals[traitOrClass.className];
  142. }
  143. this.removeTraitOrClass = removeTraitOrClass;
  144. /* Create an alias for an existing class */
  145. st.alias = function (traitOrClass, alias) {
  146. globals[alias] = traitOrClass;
  147. };
  148. st.traitsOrClasses = this.traitsOrClasses = traitsOrClasses;
  149. }
  150. MethodsBrik.deps = ["event", "selectors", "root", "selectorConversion"];
  151. function MethodsBrik (brikz, st) {
  152. var registerSelector = brikz.selectors.registerSelector;
  153. var SmalltalkObject = brikz.root.Object;
  154. var coreFns = brikz.root.coreFns;
  155. var emit = brikz.event.emit;
  156. var declareEvent = brikz.event.declareEvent;
  157. function SmalltalkMethod () {
  158. }
  159. coreFns.CompiledMethod = inherits(SmalltalkMethod, SmalltalkObject);
  160. /* Smalltalk method object. To add a method to a class,
  161. use api.addMethod() */
  162. st.method = function (spec) {
  163. var that = new SmalltalkMethod();
  164. var selector = spec.selector;
  165. that.selector = selector;
  166. that.jsSelector = st.st2js(selector);
  167. that.args = spec.args || {};
  168. that.protocol = spec.protocol;
  169. that.source = spec.source;
  170. that.messageSends = spec.messageSends || [];
  171. // TODO remove .referencedClasses, have .referencedGlobals
  172. that.referencedClasses = spec.referencedClasses || [];
  173. that.fn = spec.fn;
  174. return that;
  175. };
  176. /* Add/remove a method to/from a class */
  177. st.addMethod = function (method, traitOrBehavior) {
  178. // TODO remove .methodClass, have .owner
  179. if (method.methodClass != null) {
  180. throw new Error("addMethod: Method " + method.selector + " already bound to " + method.methodClass);
  181. }
  182. method.methodClass = traitOrBehavior;
  183. registerNewSelectors(method);
  184. traitOrBehavior.localMethods[method.selector] = method;
  185. updateMethod(method.selector, traitOrBehavior);
  186. };
  187. declareEvent("selectorsAdded");
  188. function registerNewSelectors (method) {
  189. var newSelectors = [];
  190. function selectorInUse (stSelector) {
  191. var pair = registerSelector(stSelector);
  192. if (pair) {
  193. newSelectors.push(pair);
  194. }
  195. }
  196. selectorInUse(method.selector);
  197. method.messageSends.forEach(selectorInUse);
  198. emit.selectorsAdded(newSelectors);
  199. }
  200. st.removeMethod = function (method, traitOrBehavior) {
  201. if (traitOrBehavior.localMethods[method.selector] !== method) return;
  202. delete traitOrBehavior.localMethods[method.selector];
  203. updateMethod(method.selector, traitOrBehavior);
  204. };
  205. this.setupMethods = function (traitOrBehavior) {
  206. traitOrBehavior.localMethods = Object.create(null);
  207. traitOrBehavior.methods = Object.create(null);
  208. };
  209. declareEvent("methodReplaced");
  210. function updateMethod (selector, traitOrBehavior) {
  211. var oldMethod = traitOrBehavior.methods[selector],
  212. newMethod = traitOrBehavior.localMethods[selector];
  213. if (oldMethod == null && newMethod == null) {
  214. console.warn("Removal of nonexistent method " + traitOrBehavior + " >> " + selector);
  215. return;
  216. }
  217. if (newMethod === oldMethod) return;
  218. if (newMethod != null) {
  219. traitOrBehavior.methods[selector] = newMethod;
  220. traitOrBehavior.methodAdded(newMethod);
  221. } else {
  222. delete traitOrBehavior.methods[selector];
  223. traitOrBehavior.methodRemoved(oldMethod);
  224. }
  225. emit.methodReplaced(newMethod, oldMethod, traitOrBehavior);
  226. }
  227. this.updateMethod = updateMethod;
  228. }
  229. function ArraySetBrik (brikz, st) {
  230. st.addElement = this.addElement = function (array, el) {
  231. if (typeof el === 'undefined') {
  232. return;
  233. }
  234. if (array.indexOf(el) === -1) {
  235. array.push(el);
  236. }
  237. };
  238. st.removeElement = this.removeElement = function (array, el) {
  239. var i = array.indexOf(el);
  240. if (i !== -1) {
  241. array.splice(i, 1);
  242. }
  243. };
  244. }
  245. function SelectorConversionBrik (brikz, st) {
  246. /* Convert a Smalltalk selector into a JS selector */
  247. st.st2js = function (string) {
  248. return '_' + string
  249. .replace(/:/g, '_')
  250. .replace(/[\&]/g, '_and')
  251. .replace(/[\|]/g, '_or')
  252. .replace(/[+]/g, '_plus')
  253. .replace(/-/g, '_minus')
  254. .replace(/[*]/g, '_star')
  255. .replace(/[\/]/g, '_slash')
  256. .replace(/[\\]/g, '_backslash')
  257. .replace(/[\~]/g, '_tild')
  258. .replace(/%/g, '_percent')
  259. .replace(/>/g, '_gt')
  260. .replace(/</g, '_lt')
  261. .replace(/=/g, '_eq')
  262. .replace(/,/g, '_comma')
  263. .replace(/[@]/g, '_at');
  264. };
  265. /* Convert a string to a valid smalltalk selector.
  266. if you modify the following functions, also change st2js
  267. accordingly */
  268. st.js2st = function (selector) {
  269. if (selector.match(/^__/)) {
  270. return binaryJsToSt(selector);
  271. } else {
  272. return keywordJsToSt(selector);
  273. }
  274. };
  275. function keywordJsToSt (selector) {
  276. return selector.replace(/^_/, '').replace(/_/g, ':');
  277. }
  278. function binaryJsToSt (selector) {
  279. return selector
  280. .replace(/^_/, '')
  281. .replace(/_and/g, '&')
  282. .replace(/_or/g, '|')
  283. .replace(/_plus/g, '+')
  284. .replace(/_minus/g, '-')
  285. .replace(/_star/g, '*')
  286. .replace(/_slash/g, '/')
  287. .replace(/_backslash/g, '\\')
  288. .replace(/_tild/g, '~')
  289. .replace(/_percent/g, '%')
  290. .replace(/_gt/g, '>')
  291. .replace(/_lt/g, '<')
  292. .replace(/_eq/g, '=')
  293. .replace(/_comma/g, ',')
  294. .replace(/_at/g, '@');
  295. }
  296. st.st2prop = function (stSelector) {
  297. var colonPosition = stSelector.indexOf(':');
  298. return colonPosition === -1 ? stSelector : stSelector.slice(0, colonPosition);
  299. };
  300. }
  301. NilBrik.deps = ["root"];
  302. function NilBrik (brikz, st) {
  303. var SmalltalkObject = brikz.root.Object;
  304. var coreFns = brikz.root.coreFns;
  305. function SmalltalkNil () {
  306. }
  307. coreFns.UndefinedObject = inherits(SmalltalkNil, SmalltalkObject);
  308. this.nilAsReceiver = new SmalltalkNil();
  309. this.nilAsValue = this.nilAsReceiver; // TODO null
  310. // Adds an `a$nil` (and legacy `isNil`) property to the `nil` object. When sending
  311. // nil objects from one environment to another, doing
  312. // `anObject == nil` (in JavaScript) does not always answer
  313. // true as the referenced nil object might come from the other
  314. // environment.
  315. Object.defineProperty(this.nilAsReceiver, 'a$nil', {
  316. value: true,
  317. enumerable: false, configurable: false, writable: false
  318. });
  319. Object.defineProperty(this.nilAsReceiver, 'isNil', {
  320. value: true,
  321. enumerable: false, configurable: false, writable: false
  322. });
  323. }
  324. /* Making smalltalk that has basic building blocks */
  325. function configureWithFundamentals (brikz) {
  326. brikz.smalltalkGlobals = SmalltalkGlobalsBrik;
  327. brikz.root = RootBrik;
  328. brikz.nil = NilBrik;
  329. brikz.event = EventBrik;
  330. brikz.arraySet = ArraySetBrik;
  331. brikz.selectorConversion = SelectorConversionBrik;
  332. brikz.selectors = SelectorsBrik;
  333. brikz.packages = PackagesBrik;
  334. brikz.behaviors = BehaviorsBrik;
  335. brikz.methods = MethodsBrik;
  336. brikz.rebuild();
  337. }
  338. return configureWithFundamentals;
  339. });