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copied!<p>so i tried again and found my most blatant mistake right away—the json i had posted was incorrectly using single instead of double quotes. let me detail the workflow; it's simple enough, and if you're already running CoffeeScript on NodeJS you're ready to go:</p> <ul> <li><p>locate the <code>node_modules/coffee-script/lib/coffee-script/grammar.js</code> module in your file system;</p></li> <li><p>copy & paste the code of that file into the source pane of the js->coffee pane on the <a href="http://js2coffee.org/" rel="nofollow">js2coffee</a> site (you could skip that, but i find it much more agreeable to edit CS than to fiddle with JS).</p></li> <li><p>save the translated code to <code>node_modules/coffee-script/lib/coffee-script/grammar.coffee</code>;</p></li> <li><p>go and locate </p> <pre><code>exports.parser = new Parser( tokens: tokens.join(" ") bnf: grammar operators: operators.reverse() startSymbol: "Root" ) </code></pre> <p>in the code; replace it with </p> <pre><code>console.log JSON.stringify tokens: tokens.join " " bnf: grammar operators: operators.reverse() startSymbol: "Root" </code></pre> <p>while taking care to use the exact same indentation (two space for the first line, four for the rest).</p></li> <li><p>from the command line, run sth like <code>coffee node_modules/coffee-script/lib/coffee-script/grammar.coffee > /tmp/coffee.grammar</code>;</p></li> <li><p>copy and paste the code of the resulting file into <a href="http://bottlecaps.de/convert/" rel="nofollow">the grammar converter</a>;</p></li> <li><p>copy and paste the resulting EBNF grammar from the converter into the grammar editor over at the <a href="http://bottlecaps.de/rr/ui" rel="nofollow">railroad diagram generator</a>;</p></li> <li><p>go over to the View Diagram tab and — rejoice!</p></li> </ul> <p>it's sort of a chore to do all of this copy'n'pastish stuff, but certainly good enough for any one-off visualization. i've been searching the web a lot for a reasonable RR diagram generator, and this particular one is definitely among the ones with the prettiest output. sort of surprising when you think of how simple railroad diagrams really are. </p>

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