| # Syntax of Ruby is flexible enough to allow writing Lisp-like code. | |
| # We need few helper functions (no Lisp yet): | |
| def list(*args) | |
| args | |
| end | |
| def car(list) | |
| list.first |
| /* | |
| * Task: Parse even numbers in PEG.js (http://pegjs.majda.cz). | |
| * | |
| * Solution: Let's parse all numbers and reject odd ones using a semantic | |
| * predicate -- an arbitrary piece of code that returns true (meaning "continue | |
| * parsing") or false (meaning "halt parsing"). | |
| * | |
| * This solution wouldn't work before commit a2af1fe612 because predicates | |
| * didn't have access to labeled expressions in the grammar as variables | |
| * (without ugly workarounds). But they have the access now and the solution |
| { | |
| function makeNode(type, head, tail) { | |
| return tail.length > 0 | |
| ? { | |
| type: type, | |
| terms: [head].concat(tail.map(function(t) { return t[1]; })) | |
| } | |
| : head; | |
| } | |
| } |
| [ | |
| :REGEXP, | |
| /^ | |
| \/ | |
| ( | |
| \\ # escape | |
| ( | |
| [\\"ntrfvaebs] # one-character escape | |
| | | |
| [0-7]{1,3} # octal number escape |
| def check_classes | |
| # Get list of all subclasses of Scanny::Checks::Check. | |
| classes = [] | |
| ObjectSpace.each_object(Class) do |klass| | |
| classes << klass if klass < Scanny::Checks::Check | |
| end | |
| # Filter out classes that are a superclass of some other class in the list. | |
| # This way only "leaf" classes remain. | |
| classes.reject do |klass| |
| inuit ~ » free | |
| total used free shared buffers cached | |
| Mem: 8178344 2183072 5995272 0 116532 621840 | |
| -/+ buffers/cache: 1444700 6733644 | |
| Swap: 15999996 0 15999996 |
| Call | |
| = id:ID params:Params+ { | |
| var result = { | |
| type: "var", | |
| name: id | |
| }; | |
| for (var i = 0; i < params.length; i++) { | |
| result = { | |
| type: "call", |
| Content = | |
| (Element / Text)* | |
| Element = | |
| startTag:StartTag content:Content endTag:EndTag { | |
| if (startTag != endTag) { | |
| throw new Error( | |
| "Expected </" + startTag + "> but </" + endTag + "> found." | |
| ); | |
| } |
This gist adapts a wordcloud visualization from http://www.jasondavies.com/wordcloud/ as a Juttle view, adding transitions between batches for updates.
As a silly little showcase, the demonstration program calculates a frequency count of words from Dr Seuss' "The Cat in the Hat" (text pulled from http://paulandlizdavies.com/poems/cat.htm) by splitting the words from each page into separate points, then counting the words by frequency and showing them in the wordcloud and a barchart.
| /* See https://github.com/pegjs/pegjs/pull/342 */ | |
| function subclass(child, parent) { | |
| function ctor() { this.constructor = child; } | |
| ctor.prototype = parent.prototype; | |
| child.prototype = new ctor(); | |
| } | |
| function StackError() { | |
| if (typeof Error.captureStackTrace !== "function") { |