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