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evaluator.js
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evaluator.js
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// Defines an Evaluator class, with the following constructor:
//
//
// Evaluator(options)
// options: { write: dom -> void,
// writeError: exn -> void,
// compilationServletUrl: string,
// scriptCompilationServletUrl: string}
//
// Constructs a new evaluator.
//
//
// and the main method:
//
//
// Evaluator.prototype.executeProgram: [name string] [program string] [onDone (-> void)] -> void
//
//
// Executes the program with the given name. When the program is done evaluating,
// calls onDone.
//
//
// Evaluator.prototype.requestBreak: -> void
//
// Triggers scheme evaluation to raise an exn:break.
//
//
// Evaluator.prototype.executeCompiledProgram: bytecode (-> void) (exn -> void) -> void
//
// Execute a compiled program, given the bytecode already.
//
//
//
// Evaluator.prototype.getMessageFromExn
//
// Evaluator.prototype.getStackTraceFromExn
//
//
// WARNING: this code assumes that there's toplevel access to:
//
// Evaluator.compilation_success_callback__
// Evaluator.compilation_failure_callback__
//
// because we will use SCRIPT injection to work around the same-origin
// policy for direct access to the compilation server.
var Evaluator = (function() {
var DEFAULT_COMPILATION_SERVLET_URL = "/servlets/standalone.ss";
var rewriteLocationDom = function(dom) {
var newDom = document.createElement("span");
var children = dom.children;
var line, column, id;
for (var i = 0; i < children.length; i++) {
if (children[i]['class'] === 'location-id') {
id = children[i].textContent;
}
if (children[i]['class'] === 'location-offset') {
// ignore for now
}
if (children[i]['class'] === 'location-line') {
line = children[i].textContent;
}
if (children[i]['class'] === 'location-column') {
column = children[i].textContent;
}
if (children[i]['class'] === 'location-span') {
// ignore for now
}
}
newDom.appendChild(document.createTextNode('at line: ' + line + ', column: ' + column + ', in ' + id));
return newDom;
};
var Evaluator = function(options) {
var that = this;
if (options.write) {
this.write = options.write;
} else {
this.write = function(dom) {
};
}
if (options.compilationServletUrl) {
this.compilationServletUrl = options.compilationServletUrl;
} else {
this.compilationServletUrl = DEFAULT_COMPILATION_SERVLET_URL;
}
if (options.scriptCompilationServletUrl) {
this.scriptCompilationServletUrl = options.scriptCompilationServletUrl;
} else {
this.scriptCompilationServletUrl = DEFAULT_COMPILATION_SERVLET_URL;
}
this.aState = new state.State();
this.aState.setPrintHook(function(thing) {
var dom = types.toDomNode(thing);
if (helpers.isLocationDom(dom)) {
dom = rewriteLocationDom(dom);
}
that.write(dom);
helpers.maybeCallAfterAttach(dom);
});
this.aState.setDisplayHook(function(aStr) {
var dom = document.createElement("span");
dom.style["white-space"] = "pre";
var node = document.createTextNode(aStr);
dom.appendChild(node);
that.write(dom);
helpers.maybeCallAfterAttach(dom);
});
this.aState.setToplevelNodeHook(function() {
// KLUDGE: special hook to support jsworld.
return that.makeToplevelNode();
});
};
// Toplevel nodes are constructed for world programs.
Evaluator.prototype.makeToplevelNode = function() {
var innerDom = document.createElement("div");
var dom = document.createElement("div");
dom.appendChild(innerDom);
this.write(dom);
helpers.maybeCallAfterAttach(dom);
return innerDom;
};
Evaluator.prototype.requestBreak = function() {
this.aState.requestBreak();
};
var encodeScriptParameters = function(programName, code) {
return encodeUrlParameters({ 'name': programName,
'program': code,
'callback': 'Evaluator.compilation_success_callback__',
'on-error': 'Evaluator.compilation_failure_callback__'});
};
// The limit till script breaks is about 2000 characters, according to:
// http://stackoverflow.com/questions/2659952/maximum-length-of-http-get-request
var MAX_CHARACTERS_TILL_SCRIPT_BREAKS = 2000;
// Returns true if the length of the SCRIPT src is short enough that
// we can safely use SCRIPT to talk directly to the compilation server.
Evaluator.prototype._isScriptRequestPossible = function(programName, code) {
var encodedParams = encodeScriptParameters(programName, code);
return (encodedParams.length +
this.scriptCompilationServletUrl.length + 1
< MAX_CHARACTERS_TILL_SCRIPT_BREAKS);
};
// executeProgram: string string (-> void) (exn -> void) -> void
Evaluator.prototype.executeProgram = function(programName, code,
onDone,
onDoneError) {
if (! this._isScriptRequestPossible(programName, code)) {
this._executeProgramWithAjax(programName, code, onDone, onDoneError);
} else {
this._executeProgramWithScript(programName, code, onDone, onDoneError);
}
};
// _executeProgramWithScript: string string (-> void) (exn -> void) -> void
Evaluator.prototype._executeProgramWithScript = function(programName, code,
onDone, onDoneError) {
var that = this;
var params = encodeScriptParameters(programName, code);
Evaluator.compilation_success_callback__ = function(compiledCode) {
that._onCompilationSuccess(compiledCode, onDone, onDoneError);
};
Evaluator.compilation_failure_callback__ = function(errorMessage) {
that._onCompilationFailure(errorMessage, onDoneError);
};
loadScript(this.scriptCompilationServletUrl + "?" + params);
};
// _executeProgramWithAjax: string string (-> void) (exn -> void) -> void
Evaluator.prototype._executeProgramWithAjax = function(programName, code,
onDone, onDoneError) {
var that = this;
var params = encodeUrlParameters({'name': programName,
'program': code });
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status === 200) {
that._onCompilationSuccess(eval('(' + xhr.responseText + ')'),
onDone, onDoneError);
} else {
that._onCompilationFailure(xhr.responseText,
onDoneError);
}
}
};
xhr.open("POST", this.compilationServletUrl, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(params);
};
Evaluator.prototype.executeCompiledProgram = function(compiledBytecode,
onDoneSuccess, onDoneFail) {
this.aState.clearForEval();
try {
interpret.load(compiledBytecode, this.aState);
} catch(e) {
onDoneFail(e);
return;
}
interpret.run(this.aState, onDoneSuccess, onDoneFail);
};
var encodeUrlParameters = function(hash) {
var chunks = [];
for (var key in hash) {
if (hash.hasOwnProperty(key)) {
chunks.push(encodeURIComponent(key) +"="+ encodeURIComponent(hash[key]));
}
}
return chunks.join('&');
};
Evaluator.prototype.getTraceFromExn = function(exn) {
if (types.isSchemeError(exn)) {
var errorValue = exn.val;
if (types.isExn(errorValue)) {
if (types.exnContMarks(errorValue)) {
return getTraceFromContinuationMarks(
types.exnContMarks(errorValue));
}
} else {
return [];
}
} else if (types.isInternalError(exn)) {
return getTraceFromContinuationMarks(exn.contMarks);
}
return [];
};
var getTraceFromContinuationMarks = function(contMarkSet) {
return state.getStackTraceFromContinuationMarks(contMarkSet);
};
var isEqualHash = function(hash1, hash2) {
for (var key in hash1) {
if (hash1.hasOwnProperty(key)) {
if (hash2.hasOwnProperty(key)) {
if (hash1[key] !== hash2[key]) {
return false;
}
} else {
return false;
}
}
}
for (var key in hash2) {
if (hash2.hasOwnProperty(key)) {
if (hash1.hasOwnProperty(key)) {
if (hash1[key] !== hash2[key]) {
return false;
}
} else {
return false;
}
}
}
return true;
};
Evaluator.prototype.getMessageFromExn = function(exn) {
if (types.isSchemeError(exn)) {
var errorValue = exn.val;
if (types.isExn(errorValue)) {
return types.exnMessage(errorValue);
} else {
return errorValue + '';
}
} else if (types.isInternalError(exn)) {
return exn.val + '';
} else {
return exn.message;
}
};
Evaluator.prototype._onCompilationSuccess = function(compiledBytecode,
onDoneSuccess,
onDoneFail) {
this.executeCompiledProgram(compiledBytecode, onDoneSuccess, onDoneFail);
// var onFail = function(exn) {
// // Under google-chrome, this will produce a nice error stack
// // trace that we can deal with.
// if (typeof(console) !== 'undefined' && console.log &&
// exn && exn.stack) {
// console.log(exn.stack);
// }
// if (types.isSchemeError(exn)) {
// var errorValue = exn.val;
// if (types.isExn(errorValue)) {
// that._reportError(types.exnMessage(errorValue) + '');
// if (types.exnContMarks(errorValue)) {
// var contMarkSet = types.exnContMarks(errorValue);
// var stackTrace = contMarkSet.ref(types.symbol("moby-stack-record-continuation-mark-key"));
// // KLUDGE: the first element in the stack trace
// // is weird because it's due to the print-values
// // introduced by a macro.
// stackTrace.shift();
// for (var i = stackTrace.length - 1;
// i >= 0; i--) {
// var callRecord = stackTrace[i];
// var id = callRecord.ref(0);
// var offset = callRecord.ref(1);
// var line = callRecord.ref(2);
// var column = callRecord.ref(3);
// var span = callRecord.ref(4);
// that._reportError(" in " + id +
// ", at: line " + line +
// ", column " + column +
// ", span " + span);
// }
// }
// } else {
// that._reportError(exn+'');
// }
// } else {
// that._reportError(exn+'');
// }
// onDoneSuccess();
// };
};
Evaluator.prototype._onCompilationFailure = function(errorMessage, onDoneError) {
onDoneError(new Error(errorMessage));
};
//////////////////////////////////////////////////////////////////////
/* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Contact information:
* Dao Gottwald <dao at design-noir.de>
*
* @version 1.6
* @url http://design-noir.de/webdev/JS/loadScript/
*/
var loadScript = function(url, callback) {
var f = arguments.callee;
if (!("queue" in f))
f.queue = {};
var queue = f.queue;
if (url in queue) { // script is already in the document
if (callback) {
if (queue[url]) // still loading
queue[url].push(callback);
else // loaded
callback();
}
return;
}
queue[url] = callback ? [callback] : [];
var script = document.createElement("script");
script.type = "text/javascript";
script.onload = script.onreadystatechange = function() {
if (script.readyState && script.readyState != "loaded" && script.readyState != "complete")
return;
script.onreadystatechange = script.onload = null;
document.getElementsByTagName("head")[0].removeChild(script);
var work = queue[url];
delete(queue[url]);
while (work.length)
work.shift()();
};
script.src = url;
document.getElementsByTagName("head")[0].appendChild(script);
}
//////////////////////////////////////////////////////////////////////
return Evaluator;
})();
Evaluator.compilation_success_callback__ = function() {}
Evaluator.compilation_failure_callback__ = function() {}