diff options
Diffstat (limited to 'threads.js')
| -rw-r--r-- | threads.js | 430 |
1 files changed, 254 insertions, 176 deletions
@@ -83,7 +83,7 @@ ArgLabelMorph, localize, XML_Element, hex_sha512*/ // Global stuff //////////////////////////////////////////////////////// -modules.threads = '2014-October-01'; +modules.threads = '2014-December-17'; var ThreadManager; var Process; @@ -100,8 +100,18 @@ function snapEquals(a, b) { var x = +a, y = +b, + i, specials = [true, false, '']; + // "zum Schneckengang verdorben, was Adlerflug geworden wäre" + // collecting edge-cases that somebody complained about + // on Github. Folks, take it easy and keep it fun, okay? + // Shit like this is patently ugly and slows Snap down. Tnx! + for (i = 9; i <= 13; i += 1) { + specials.push(String.fromCharCode(i)); + } + specials.push(String.fromCharCode(160)); + // check for special values before coercing to numbers if (isNaN(x) || isNaN(y) || [a, b].some(function (any) {return contains(specials, any) || @@ -110,7 +120,7 @@ function snapEquals(a, b) { y = b; } - // handle text comparision case-insensitive. + // handle text comparison case-insensitive. if (isString(x) && isString(y)) { return x.toLowerCase() === y.toLowerCase(); } @@ -136,7 +146,8 @@ ThreadManager.prototype.toggleProcess = function (block) { ThreadManager.prototype.startProcess = function ( block, isThreadSafe, - exportResult + exportResult, + callback ) { var active = this.findProcess(block), top = block.topBlock(), @@ -149,7 +160,7 @@ ThreadManager.prototype.startProcess = function ( this.removeTerminatedProcesses(); } top.addHighlight(); - newProc = new Process(block.topBlock()); + newProc = new Process(block.topBlock(), callback); newProc.exportResult = exportResult; this.processes.push(newProc); return newProc; @@ -207,11 +218,10 @@ ThreadManager.prototype.resumeAll = function (stage) { }; ThreadManager.prototype.step = function () { -/* - run each process until it gives up control, skipping processes - for sprites that are currently picked up, then filter out any - processes that have been terminated -*/ + // run each process until it gives up control, skipping processes + // for sprites that are currently picked up, then filter out any + // processes that have been terminated + this.processes.forEach(function (proc) { if (!proc.homeContext.receiver.isPickedUp() && !proc.isDead) { proc.runStep(); @@ -224,9 +234,10 @@ ThreadManager.prototype.removeTerminatedProcesses = function () { // and un-highlight their scripts var remaining = []; this.processes.forEach(function (proc) { - if (!proc.isRunning() && !proc.errorFlag && !proc.isDead) { - proc.topBlock.removeHighlight(); - + if ((!proc.isRunning() && !proc.errorFlag) || proc.isDead) { + if (proc.topBlock instanceof BlockMorph) { + proc.topBlock.removeHighlight(); + } if (proc.prompter) { proc.prompter.destroy(); if (proc.homeContext.receiver.stopTalking) { @@ -235,18 +246,22 @@ ThreadManager.prototype.removeTerminatedProcesses = function () { } if (proc.topBlock instanceof ReporterBlockMorph) { - if (proc.homeContext.inputs[0] instanceof List) { - proc.topBlock.showBubble( - new ListWatcherMorph( - proc.homeContext.inputs[0] - ), - proc.exportResult - ); + if (proc.onComplete instanceof Function) { + proc.onComplete(proc.homeContext.inputs[0]); } else { - proc.topBlock.showBubble( - proc.homeContext.inputs[0], - proc.exportResult - ); + if (proc.homeContext.inputs[0] instanceof List) { + proc.topBlock.showBubble( + new ListWatcherMorph( + proc.homeContext.inputs[0] + ), + proc.exportResult + ); + } else { + proc.topBlock.showBubble( + proc.homeContext.inputs[0], + proc.exportResult + ); + } } } } else { @@ -295,9 +310,9 @@ ThreadManager.prototype.findProcess = function (block) { are children receiver object (sprite) to which the process applies, cached from the top block - context the Context describing the current state + context the Context describing the current state of this process - homeContext stores information relevant to the whole process, + homeContext stores information relevant to the whole process, i.e. its receiver, result etc. isPaused boolean indicating whether to pause readyToYield boolean indicating whether to yield control to @@ -305,15 +320,20 @@ ThreadManager.prototype.findProcess = function (block) { readyToTerminate boolean indicating whether the stop method has been called isDead boolean indicating a terminated clone process - timeout msecs after which to force yield - lastYield msecs when the process last yielded - errorFlag boolean indicating whether an error was encountered + timeout msecs after which to force yield + lastYield msecs when the process last yielded + errorFlag boolean indicating whether an error was encountered prompter active instance of StagePrompterMorph httpRequest active instance of an HttpRequest or null pauseOffset msecs between the start of an interpolated operation and when the process was paused exportResult boolean flag indicating whether a picture of the top block along with the result bubble shoud be exported + onComplete an optional callback function to be executed when + the process is done + procedureCount number counting procedure call entries, + used to tag custom block calls, so "stop block" + invocations can catch them */ Process.prototype = {}; @@ -321,7 +341,7 @@ Process.prototype.contructor = Process; Process.prototype.timeout = 500; // msecs after which to force yield Process.prototype.isCatchingErrors = true; -function Process(topBlock) { +function Process(topBlock, onComplete) { this.topBlock = topBlock || null; this.readyToYield = false; @@ -338,6 +358,8 @@ function Process(topBlock) { this.pauseOffset = null; this.frameCount = 0; this.exportResult = false; + this.onComplete = onComplete || null; + this.procedureCount = 0; if (topBlock) { this.homeContext.receiver = topBlock.receiver(); @@ -361,13 +383,13 @@ Process.prototype.isRunning = function () { // Process entry points Process.prototype.runStep = function () { -/* - a step is an an uninterruptable 'atom', it can consist - of several contexts, even of several blocks -*/ + // a step is an an uninterruptable 'atom', it can consist + // of several contexts, even of several blocks + if (this.isPaused) { // allow pausing in between atomic steps: return this.pauseStep(); } + this.readyToYield = false; while (!this.readyToYield && this.context @@ -435,8 +457,10 @@ Process.prototype.pauseStep = function () { Process.prototype.evaluateContext = function () { var exp = this.context.expression; - this.frameCount += 1; + if (this.context.tag === 'exit') { + this.expectReport(); + } if (exp instanceof Array) { return this.evaluateSequence(exp); } @@ -460,7 +484,7 @@ Process.prototype.evaluateContext = function () { Process.prototype.evaluateBlock = function (block, argCount) { // check for special forms - if (contains(['reportOr', 'reportAnd'], block.selector)) { + if (contains(['reportOr', 'reportAnd', 'doReport'], block.selector)) { return this[block.selector](block); } @@ -526,6 +550,35 @@ Process.prototype.reportAnd = function (block) { } }; +Process.prototype.doReport = function (block) { + var outer = this.context.outerContext; + if (this.context.expression.partOfCustomCommand) { + this.doStopCustomBlock(); + this.popContext(); + } else { + while (this.context && this.context.tag !== 'exit') { + if (this.context.expression === 'doStopWarping') { + this.doStopWarping(); + } else { + this.popContext(); + } + } + if (this.context) { + if (this.context.expression === 'expectReport') { + // pop off inserted top-level exit context + this.popContext(); + } else { + // un-tag and preserve original caller + this.context.tag = null; + } + } + } + // in any case evaluate (and ignore) + // the input, because it could be + // and HTTP Request for a hardware extension + this.pushContext(block.inputs()[0], outer); +}; + // Process: Non-Block evaluation Process.prototype.evaluateMultiSlot = function (multiSlot, argCount) { @@ -586,7 +639,6 @@ Process.prototype.evaluateInput = function (input) { ) || (input instanceof CSlotMorph && !input.isStatic)) { // I know, this still needs yet to be done right.... ans = this.reify(ans, new List()); - ans.isImplicitLambda = true; } } } @@ -597,8 +649,6 @@ Process.prototype.evaluateInput = function (input) { Process.prototype.evaluateSequence = function (arr) { var pc = this.context.pc, outer = this.context.outerContext, - isLambda = this.context.isLambda, - isImplicitLambda = this.context.isImplicitLambda, isCustomBlock = this.context.isCustomBlock; if (pc === (arr.length - 1)) { // tail call elimination this.context = new Context( @@ -607,8 +657,6 @@ Process.prototype.evaluateSequence = function (arr) { this.context.outerContext, this.context.receiver ); - this.context.isLambda = isLambda; - this.context.isImplicitLambda = isImplicitLambda; this.context.isCustomBlock = isCustomBlock; } else { if (pc >= arr.length) { @@ -626,8 +674,8 @@ Process.prototype.evaluateSequence = function (arr) { Caution: we cannot just revert to this version of the method, because to make tail call elimination work many tweaks had to be done to various primitives. For the most part these tweaks are about schlepping the outer context (for -the variable bindings) and the isLambda flag along, and are indicated by a -short comment in the code. But to really revert would take a good measure +the variable bindings) and the isCustomBlock flag along, and are indicated +by a short comment in the code. But to really revert would take a good measure of trial and error as well as debugging. In the developers file archive there is a version of threads.js dated 120119(2) which basically resembles the last version before introducing tail call optimization on 120123. @@ -679,6 +727,10 @@ Process.prototype.doYield = function () { } }; +Process.prototype.expectReport = function () { + this.handleError(new Error("reporter didn't report")); +}; + // Process Exception Handling Process.prototype.handleError = function (error, element) { @@ -757,8 +809,8 @@ Process.prototype.reportJSFunction = function (parmNames, body) { ); }; -Process.prototype.doRun = function (context, args, isCustomBlock) { - return this.evaluate(context, args, true, isCustomBlock); +Process.prototype.doRun = function (context, args) { + return this.evaluate(context, args, true); }; Process.prototype.evaluate = function ( @@ -781,8 +833,9 @@ Process.prototype.evaluate = function ( } var outer = new Context(null, null, context.outerContext), + caller = this.context.parentContext, + exit, runnable, - extra, parms = args.asArray(), i, value; @@ -796,25 +849,13 @@ Process.prototype.evaluate = function ( outer, context.receiver ); - extra = new Context(runnable, 'doYield'); + this.context.parentContext = runnable; - /* - Note: if the context's expression is a ReporterBlockMorph, - the extra context gets popped off immediately without taking - effect (i.e. it doesn't yield within evaluating a stack of - nested reporters) - */ - - if (isCommand || (context.expression instanceof ReporterBlockMorph)) { - this.context.parentContext = extra; - } else { - this.context.parentContext = runnable; + if (context.expression instanceof ReporterBlockMorph) { + // auto-"warp" nested reporters + this.readyToYield = (Date.now() - this.lastYield > this.timeout); } - runnable.isLambda = true; - runnable.isImplicitLambda = context.isImplicitLambda; - runnable.isCustomBlock = false; - // assign parameters if any were passed if (parms.length > 0) { @@ -849,8 +890,9 @@ Process.prototype.evaluate = function ( } else if (context.emptySlots !== 1) { throw new Error( - 'expecting ' + context.emptySlots + ' input(s), ' - + 'but getting ' + parms.length + localize('expecting') + ' ' + context.emptySlots + ' ' + + localize('input(s), but getting') + ' ' + + parms.length ); } } @@ -858,6 +900,23 @@ Process.prototype.evaluate = function ( if (runnable.expression instanceof CommandBlockMorph) { runnable.expression = runnable.expression.blockSequence(); + if (!isCommand) { + if (caller) { + // tag caller, so "report" can catch it later + caller.tag = 'exit'; + } else { + // top-level context, insert a tagged exit context + // which "report" can catch later + exit = new Context( + runnable.parentContext, + 'expectReport', + outer, + outer.receiver + ); + exit.tag = 'exit'; + runnable.parentContext = exit; + } + } } }; @@ -867,6 +926,9 @@ Process.prototype.fork = function (context, args) { 'continuations cannot be forked' ); } + if (!(context instanceof Context)) { + throw new Error('expecting a ring but getting ' + context); + } var outer = new Context(null, null, context.outerContext), runnable = new Context(null, @@ -879,8 +941,6 @@ Process.prototype.fork = function (context, args) { stage = this.homeContext.receiver.parentThatIsA(StageMorph), proc = new Process(); - runnable.isLambda = true; - // assign parameters if any were passed if (parms.length > 0) { @@ -915,8 +975,9 @@ Process.prototype.fork = function (context, args) { } else if (context.emptySlots !== 1) { throw new Error( - 'expecting ' + context.emptySlots + ' input(s), ' - + 'but getting ' + parms.length + localize('expecting') + ' ' + context.emptySlots + ' ' + + localize('input(s), but getting') + ' ' + + parms.length ); } } @@ -933,68 +994,48 @@ Process.prototype.fork = function (context, args) { stage.threads.processes.push(proc); }; -Process.prototype.doReport = function (value, isCSlot) { - while (this.context && !this.context.isLambda) { +// Process stopping blocks primitives + +Process.prototype.doStopBlock = function () { + var target = this.context.expression.exitTag; + if (isNil(target)) { + return this.doStopCustomBlock(); + } + while (this.context && + (isNil(this.context.tag) || (this.context.tag > target))) { if (this.context.expression === 'doStopWarping') { this.doStopWarping(); } else { this.popContext(); } } - if (this.context && this.context.isImplicitLambda) { + this.pushContext(); +}; + +Process.prototype.doStopCustomBlock = function () { + // fallback solution for "report" blocks inside + // custom command definitions and untagged "stop" blocks + while (this.context && !this.context.isCustomBlock) { if (this.context.expression === 'doStopWarping') { this.doStopWarping(); } else { this.popContext(); } - return this.doReport(value, true); - } - if (this.context && this.context.isCustomBlock) { - // now I'm back at the custom block sequence. - // advance my pc to my expression's length - this.context.pc = this.context.expression.length - 1; } - if (isCSlot) { - if (this.context && - this.context.parentContext && - this.context.parentContext.expression instanceof Array) { - this.popContext(); - } - } - return value; -}; - -Process.prototype.doStopBlock = function () { - this.doReport(); -}; - -// Process evaluation variants, commented out for now (redundant) - -/* -Process.prototype.doRunWithInputList = function (context, args) { - // provide an extra selector for the palette - return this.doRun(context, args); -}; - -Process.prototype.evaluateWithInputList = function (context, args) { - // provide an extra selector for the palette - return this.evaluate(context, args); }; -Process.prototype.forkWithInputList = function (context, args) { - // provide an extra selector for the palette - return this.fork(context, args); -}; -*/ - // Process continuations primitives -Process.prototype.doCallCC = function (aContext) { - this.evaluate(aContext, new List([this.context.continuation()])); +Process.prototype.doCallCC = function (aContext, isReporter) { + this.evaluate( + aContext, + new List([this.context.continuation()]), + !isReporter + ); }; Process.prototype.reportCallCC = function (aContext) { - this.doCallCC(aContext); + this.doCallCC(aContext, true); }; Process.prototype.runContinuation = function (aContext, args) { @@ -1012,19 +1053,21 @@ Process.prototype.runContinuation = function (aContext, args) { // Process custom block primitives Process.prototype.evaluateCustomBlock = function () { - var context = this.context.expression.definition.body, + var caller = this.context.parentContext, + context = this.context.expression.definition.body, declarations = this.context.expression.definition.declarations, args = new List(this.context.inputs), parms = args.asArray(), runnable, - extra, + exit, i, value, outer; if (!context) {return null; } + this.procedureCount += 1; outer = new Context(); - outer.receiver = this.context.receiver; // || this.homeContext.receiver; + outer.receiver = this.context.receiver; outer.variables.parentFrame = outer.receiver ? outer.receiver.variables : null; @@ -1032,15 +1075,10 @@ Process.prototype.evaluateCustomBlock = function () { this.context.parentContext, context.expression, outer, - outer.receiver, - true // is custom block + outer.receiver ); - extra = new Context(runnable, 'doYield'); - - this.context.parentContext = extra; - - runnable.isLambda = true; runnable.isCustomBlock = true; + this.context.parentContext = runnable; // passing parameters if any were passed if (parms.length > 0) { @@ -1062,9 +1100,43 @@ Process.prototype.evaluateCustomBlock = function () { } } - if (runnable.expression instanceof CommandBlockMorph) { - runnable.expression = runnable.expression.blockSequence(); + // tag return target + if (this.context.expression.definition.type !== 'command') { + if (caller) { + // tag caller, so "report" can catch it later + caller.tag = 'exit'; + } else { + // top-level context, insert a tagged exit context + // which "report" can catch later + exit = new Context( + runnable.parentContext, + 'expectReport', + outer, + outer.receiver + ); + exit.tag = 'exit'; + runnable.parentContext = exit; + } + // auto-"warp" nested reporters + this.readyToYield = (Date.now() - this.lastYield > this.timeout); + } else { + // tag all "stop this block" blocks with the current + // procedureCount as exitTag, and mark all "report" blocks + // as being inside a custom command definition + runnable.expression.tagExitBlocks(this.procedureCount, true); + + // tag the caller with the current procedure count, so + // "stop this block" blocks can catch it, but only + // if the caller hasn't been tagged already + if (caller && !caller.tag) { + caller.tag = this.procedureCount; + } + // yield commands unless explicitly "warped" + if (!this.isAtomic) { + this.readyToYield = true; + } } + runnable.expression = runnable.expression.blockSequence(); }; // Process variables primitives @@ -1148,7 +1220,7 @@ Process.prototype.doShowVar = function (varName) { if (isGlobal || target.owner) { label = name; } else { - label = name + ' (temporary)'; + label = name + ' ' + localize('(temporary)'); } watcher = new WatcherMorph( label, @@ -1259,7 +1331,7 @@ Process.prototype.doInsertInList = function (element, index, list) { return null; } if (this.inputOption(index) === 'any') { - idx = this.reportRandom(1, list.length()); + idx = this.reportRandom(1, list.length() + 1); } if (this.inputOption(index) === 'last') { idx = list.length() + 1; @@ -1308,16 +1380,12 @@ Process.prototype.reportListContainsItem = function (list, element) { Process.prototype.doIf = function () { var args = this.context.inputs, outer = this.context.outerContext, // for tail call elimination - isLambda = this.context.isLambda, - isImplicitLambda = this.context.isImplicitLambda, isCustomBlock = this.context.isCustomBlock; this.popContext(); if (args[0]) { if (args[1]) { this.pushContext(args[1].blockSequence(), outer); - this.context.isLambda = isLambda; - this.context.isImplicitLambda = isImplicitLambda; this.context.isCustomBlock = isCustomBlock; } } @@ -1327,8 +1395,6 @@ Process.prototype.doIf = function () { Process.prototype.doIfElse = function () { var args = this.context.inputs, outer = this.context.outerContext, // for tail call elimination - isLambda = this.context.isLambda, - isImplicitLambda = this.context.isImplicitLambda, isCustomBlock = this.context.isCustomBlock; this.popContext(); @@ -1344,8 +1410,6 @@ Process.prototype.doIfElse = function () { } } if (this.context) { - this.context.isLambda = isLambda; - this.context.isImplicitLambda = isImplicitLambda; this.context.isCustomBlock = isCustomBlock; } @@ -1420,8 +1484,6 @@ Process.prototype.doStopOthers = function (choice) { Process.prototype.doWarp = function (body) { // execute my contents block atomically (more or less) var outer = this.context.outerContext, // for tail call elimination - isLambda = this.context.isLambda, - isImplicitLambda = this.context.isImplicitLambda, isCustomBlock = this.context.isCustomBlock, stage; @@ -1438,13 +1500,8 @@ Process.prototype.doWarp = function (body) { stage.fps = 0; // variable frame rate } } - this.pushContext('doYield'); - - this.context.isLambda = isLambda; - this.context.isImplicitLambda = isImplicitLambda; this.context.isCustomBlock = isCustomBlock; - if (!this.isAtomic) { this.pushContext('doStopWarping'); } @@ -1523,28 +1580,19 @@ Process.prototype.doForever = function (body) { Process.prototype.doRepeat = function (counter, body) { var block = this.context.expression, outer = this.context.outerContext, // for tail call elimination - isLambda = this.context.isLambda, - isImplicitLambda = this.context.isImplicitLambda, isCustomBlock = this.context.isCustomBlock; if (counter < 1) { // was '=== 0', which caused infinite loops on non-ints return null; } this.popContext(); - this.pushContext(block, outer); - - this.context.isLambda = isLambda; - this.context.isImplicitLambda = isImplicitLambda; this.context.isCustomBlock = isCustomBlock; - this.context.addInput(counter - 1); - this.pushContext('doYield'); if (body) { this.pushContext(body.blockSequence()); } - this.pushContext(); }; @@ -1631,6 +1679,27 @@ Process.prototype.reportMap = function (reporter, list) { } }; +Process.prototype.doForEach = function (upvar, list, script) { + // perform a script for each element of a list, assigning the + // current iteration's element to a variable with the name + // specified in the "upvar" parameter, so it can be referenced + // within the script. Uses the context's - unused - fourth + // element as temporary storage for the current list index + + if (isNil(this.context.inputs[3])) {this.context.inputs[3] = 1; } + var index = this.context.inputs[3]; + this.context.outerContext.variables.addVar(upvar); + this.context.outerContext.variables.setVar( + upvar, + list.at(index) + ); + if (index > list.length()) {return; } + this.context.inputs[3] += 1; + this.pushContext('doYield'); + this.pushContext(); + this.evaluate(script, new List(), true); +}; + // Process interpolated primitives Process.prototype.doWait = function (secs) { @@ -2134,15 +2203,17 @@ Process.prototype.reportTextSplit = function (string, delimiter) { str, del; if (!contains(types, strType)) { - throw new Error('expecting a text instad of a ' + strType); + throw new Error('expecting text instead of a ' + strType); } if (!contains(types, delType)) { - throw new Error('expecting a text delimiter instad of a ' + delType); + throw new Error('expecting a text delimiter instead of a ' + delType); } str = (string || '').toString(); switch (this.inputOption(delimiter)) { case 'line': - del = '\n'; + // Unicode Compliant Line Splitting (Platform independent) + // http://www.unicode.org/reports/tr18/#Line_Boundaries + del = /\r\n|[\n\v\f\r\x85\u2028\u2029]/; break; case 'tab': del = '\t'; @@ -2151,7 +2222,9 @@ Process.prototype.reportTextSplit = function (string, delimiter) { del = '\r'; break; case 'whitespace': - return new List(str.trim().split(/[\t\r\n ]+/)); + str = str.trim(); + del = /\s+/; + break; case 'letter': del = ''; break; @@ -2316,6 +2389,7 @@ Process.prototype.objectTouchingObject = function (thisObj, name) { var myself = this, those, stage, + box, mouse; if (this.inputOption(name) === 'mouse-pointer') { @@ -2327,9 +2401,14 @@ Process.prototype.objectTouchingObject = function (thisObj, name) { } else { stage = thisObj.parentThatIsA(StageMorph); if (stage) { - if (this.inputOption(name) === 'edge' && - !stage.bounds.containsRectangle(thisObj.bounds)) { - return true; + if (this.inputOption(name) === 'edge') { + box = thisObj.bounds; + if (!thisObj.costume && thisObj.penBounds) { + box = thisObj.penBounds.translateBy(thisObj.position()); + } + if (!stage.bounds.containsRectangle(box)) { + return true; + } } if (this.inputOption(name) === 'pen trails' && thisObj.isTouching(stage.penTrailsMorph())) { @@ -2467,6 +2546,7 @@ Process.prototype.reportContextFor = function (context, otherObj) { if (result.outerContext) { result.outerContext = copy(result.outerContext); result.outerContext.receiver = otherObj; + result.outerContext.variables.parentFrame = otherObj.variables; } return result; }; @@ -2760,25 +2840,25 @@ Process.prototype.reportFrameCount = function () { structure: - parentContext the Context to return to when this one has + parentContext the Context to return to when this one has been evaluated. outerContext the Context holding my lexical scope - expression SyntaxElementMorph, an array of blocks to evaluate, + expression SyntaxElementMorph, an array of blocks to evaluate, null or a String denoting a selector, e.g. 'doYield' receiver the object to which the expression applies, if any - variables the current VariableFrame, if any - inputs an array of input values computed so far + variables the current VariableFrame, if any + inputs an array of input values computed so far (if expression is a BlockMorph) - pc the index of the next block to evaluate + pc the index of the next block to evaluate (if expression is an array) - startTime time when the context was first evaluated - startValue initial value for interpolated operations + startTime time when the context was first evaluated + startValue initial value for interpolated operations activeAudio audio buffer for interpolated operations, don't persist activeNote audio oscillator for interpolated ops, don't persist - isLambda marker for return ops - isImplicitLambda marker for return ops isCustomBlock marker for return ops - emptySlots caches the number of empty slots for reification + emptySlots caches the number of empty slots for reification + tag string or number to optionally identify the Context, + as a "return" target (for the "stop block" primitive) */ function Context( @@ -2801,22 +2881,19 @@ function Context( this.startTime = null; this.activeAudio = null; this.activeNote = null; - this.isLambda = false; // marks the end of a lambda - this.isImplicitLambda = false; // marks the end of a C-shaped slot this.isCustomBlock = false; // marks the end of a custom block's stack this.emptySlots = 0; // used for block reification + this.tag = null; // lexical catch-tag for custom blocks } Context.prototype.toString = function () { - var pref = this.isLambda ? '\u03BB-' : '', - expr = this.expression; - + var expr = this.expression; if (expr instanceof Array) { if (expr.length > 0) { expr = '[' + expr[0] + ']'; } } - return pref + 'Context >> ' + expr + ' ' + this.variables; + return 'Context >> ' + expr + ' ' + this.variables; }; Context.prototype.image = function () { @@ -2870,9 +2947,10 @@ Context.prototype.continuation = function () { } else if (this.parentContext) { cont = this.parentContext; } else { - return new Context(null, 'doStop'); + return new Context(null, 'doYield'); } cont = cont.copyForContinuation(); + cont.tag = null; cont.isContinuation = true; return cont; }; @@ -3003,9 +3081,9 @@ VariableFrame.prototype.find = function (name) { var frame = this.silentFind(name); if (frame) {return frame; } throw new Error( - 'a variable of name \'' + localize('a variable of name \'') + name - + '\'\ndoes not exist in this context' + + localize('\'\ndoes not exist in this context') ); }; @@ -3070,9 +3148,9 @@ VariableFrame.prototype.getVar = function (name) { return ''; } throw new Error( - 'a variable of name \'' + localize('a variable of name \'') + name - + '\'\ndoes not exist in this context' + + localize('\'\ndoes not exist in this context') ); }; |