276 lines
8.7 KiB
JavaScript
276 lines
8.7 KiB
JavaScript
/*jslint devel: true, browser: false, unparam: true, sub: true, windows: false, vars: true, white: true, maxerr: 50, indent: 4 */
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/*global $,plt,EXPORTS,document,window*/
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(function() {
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"use strict";
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var VOID = plt.baselib.constants.VOID_VALUE;
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var PAUSE = plt.runtime.PAUSE;
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var makePrimitiveProcedure = plt.baselib.functions.makePrimitiveProcedure;
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var makeClosure = plt.baselib.functions.makeClosure;
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var makeCheckArgumentType = plt.baselib.check.makeCheckArgumentType;
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var checkSymbolOrString = plt.baselib.check.checkSymbolOrString;
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var checkString = plt.baselib.check.checkString;
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var checkAny = makeCheckArgumentType(function(x) { return true; },
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"any");
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var isJsString = function(x) { return typeof(x) === 'string'; };
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var checkJsString = makeCheckArgumentType(isJsString, 'JavaScript string');
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var isJsNumber = function(x) { return typeof(x) === 'number'; };
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var checkNumber = plt.baselib.check.checkNumber;
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var checkJsNumber = makeCheckArgumentType(isJsNumber, 'JavaScript number');
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//////////////////////////////////////////////////////////////////////
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/* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Contact information:
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* Dao Gottwald <dao at design-noir.de>
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*
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* @version 1.6
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* @url http://design-noir.de/webdev/JS/loadScript/
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*/
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var _loadScriptQueue = {};
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var loadScript = function(url, callback, onError) {
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var queue = _loadScriptQueue;
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if (url in queue) { // script is already in the document
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if (callback) {
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if (queue[url]) // still loading
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queue[url].push(callback);
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else // loaded
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callback();
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}
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return;
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}
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queue[url] = callback ? [callback] : [];
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var script = document.createElement("script");
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script.type = "text/javascript";
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script.onload = script.onreadystatechange = function() {
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if (script.readyState && script.readyState != "loaded" && script.readyState != "complete")
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return;
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script.onreadystatechange = script.onload = null;
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document.getElementsByTagName("head")[0].removeChild(script);
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var work = queue[url];
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delete(queue[url]);
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while (work.length)
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work.shift()();
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};
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script.onerror = function() {
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script.onreadystatechange = script.onload = null;
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document.getElementsByTagName("head")[0].removeChild(script);
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onError();
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};
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script.src = url;
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document.getElementsByTagName("head")[0].appendChild(script);
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};
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EXPORTS['alert'] =
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makePrimitiveProcedure(
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'alert',
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1,
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function(MACHINE) {
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var elt = MACHINE.e[MACHINE.e.length - 1];
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alert(String(elt));
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return VOID;
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});
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EXPORTS['js-eval'] =
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makePrimitiveProcedure(
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'myalert',
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1,
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function(MACHINE) {
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var elt = MACHINE.e[MACHINE.e.length - 1];
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var obj = eval(String(elt));
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return obj;
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});
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EXPORTS['load-script'] =
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makeClosure(
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'load-script',
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1,
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function(MACHINE) {
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var url = checkString(MACHINE, 'load-string', 0);
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PAUSE(
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function(restart) {
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var onload = function() {
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restart(function(MACHINE) {
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plt.runtime.finalizeClosureCall(
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MACHINE,
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VOID);
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});
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};
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var onerror = function(e) {
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restart(function(MACHINE) {
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plt.baselib.exceptions.raiseFailure(
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MACHINE,
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plt.baselib.format.format(
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"unable to load ~a: ~a",
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[url,
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e.message]));
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});
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};
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loadScript(url.toString(),
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onload,
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onerror);
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}
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);
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},
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void(0));
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EXPORTS['body'] = $(document.body);
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EXPORTS['$'] =
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makePrimitiveProcedure(
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'$',
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1,
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function(MACHINE) {
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var obj = MACHINE.e[MACHINE.e.length - 1];
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return $(obj);
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});
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EXPORTS['call-method'] =
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makePrimitiveProcedure(
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'call-method',
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plt.baselib.arity.makeArityAtLeast(2),
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function(MACHINE) {
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var obj = MACHINE.e[MACHINE.e.length - 1];
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var methodName = MACHINE.e[MACHINE.e.length - 2];
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var args = [], i;
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for (i = 0; i < MACHINE.a - 2; i = i+1) {
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args.push(MACHINE.e[MACHINE.e.length -1 - 2 - i]);
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}
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var result = obj[methodName].apply(obj, args);
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return result;
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});
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EXPORTS['window'] = window;
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EXPORTS['get-attr'] =
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makePrimitiveProcedure(
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'get-attr',
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plt.baselib.arity.makeArityAtLeast(2),
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function(MACHINE) {
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var obj = checkAny(MACHINE, 'get-attr', 0), attr, i;
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for (i = 1; i < MACHINE.a; i = i + 1) {
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attr = checkSymbolOrString(MACHINE, 'get-attr', i).toString();
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obj = obj[attr];
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}
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return obj;
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});
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EXPORTS['set-attr!'] =
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makePrimitiveProcedure(
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'set-attr!',
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3,
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function(MACHINE) {
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var obj = checkAny(MACHINE, 'set-attr!', 0);
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var attr = checkSymbolOrString(MACHINE, 'set-attr!', 1).toString();
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var val = checkAny(MACHINE, 'set-attr!', 2);
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obj[attr] = val;
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return VOID;
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});
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EXPORTS['js-string?'] =
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makePrimitiveProcedure(
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'js-string?',
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1,
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function(MACHINE) {
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return typeof(checkAny(MACHINE, 'js-string?', 0)) === 'string';
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});
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EXPORTS['string->js-string'] =
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makePrimitiveProcedure(
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'string->js-string',
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1,
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function(MACHINE) {
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return checkString(MACHINE, 'string->js-string', 0).toString();
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});
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EXPORTS['js-string->string'] =
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makePrimitiveProcedure(
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'js-string->string',
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1,
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function(MACHINE) {
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return checkJsString(MACHINE, 'string->js-string', 0);
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});
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EXPORTS['js-number?'] =
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makePrimitiveProcedure(
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'js-number?',
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1,
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function(MACHINE) {
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return isJsNumber(checkAny(MACHINE, 'js-string?', 0));
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});
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EXPORTS['js-number->number'] =
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makePrimitiveProcedure(
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'js-number->number',
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1,
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function(MACHINE) {
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return plt.baselib.numbers.makeFloat(checkJsNumber(MACHINE, 'js-string?', 0));
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});
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EXPORTS['number->js-number'] =
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makePrimitiveProcedure(
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'number->js-number',
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1,
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function(MACHINE) {
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return plt.baselib.numbers.toFixnum(checkNumber(MACHINE, 'js-string?', 0));
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});
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EXPORTS['js-null?'] =
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makePrimitiveProcedure(
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'js-null?',
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1,
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function(MACHINE) {
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return checkAny(MACHINE, 'js-null?', 0) === null;
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});
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EXPORTS['js-null'] = null;
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// Javascript-specific extensions. A small experiment.
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EXPORTS['viewport-width'] =
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makePrimitiveProcedure(
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'viewport-width',
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0,
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function(MACHINE) {
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return $(window).width();
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});
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EXPORTS['viewport-height'] =
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makePrimitiveProcedure(
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'viewport-height',
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0,
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function(MACHINE) {
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return $(window).height();
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});
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EXPORTS['in-javascript-context?'] =
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makePrimitiveProcedure(
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'in-javascript-context?',
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0,
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function(MACHINE) {
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return true;
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});
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}()); |