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    <p>Here are the instructions for creating a syntax diagram.</p> <p>The content of <a href="https://github.com/jashkenas/coffee-script/blob/master/src/grammar.coffee" rel="noreferrer">grammar.coffee</a> is executable code, which must be run for getting the actual Jison grammar. I used the <a href="http://jashkenas.github.com/coffee-script/" rel="noreferrer">Try CoffeeScript</a> page to compile it, after having replaced the Jison call by a Javascript alert. Then ran the resulting Javascript to obtain the grammar, which looks like this:</p> <pre><code>{ "tokens":" TERMINATOR TERMINATOR TERMINATOR STATEMENT INDENT OUTDENT INDENT OUTDENT IDENTIFIER NUMBER STRING JS REGEX BOOL = = INDENT OUTDENT : : INDENT OUTDENT RETURN RETURN HERECOMMENT PARAM_START PARAM_END -&gt; =&gt; , , ... = ... . ?. :: :: INDEX_START INDEX_END INDEX_SOAK { } , TERMINATOR INDENT OUTDENT CLASS CLASS CLASS EXTENDS CLASS EXTENDS CLASS CLASS CLASS EXTENDS CLASS EXTENDS SUPER SUPER FUNC_EXIST CALL_START CALL_END CALL_START CALL_END THIS @ @ [ ] [ ] .. ... [ ] , TERMINATOR INDENT OUTDENT INDENT OUTDENT , TRY TRY TRY FINALLY TRY FINALLY CATCH THROW ( ) ( INDENT OUTDENT ) WHILE WHILE WHEN UNTIL UNTIL WHEN LOOP LOOP FOR FOR FOR OWN , FORIN FOROF FORIN WHEN FOROF WHEN FORIN BY FORIN WHEN BY FORIN BY WHEN SWITCH INDENT OUTDENT SWITCH INDENT ELSE OUTDENT SWITCH INDENT OUTDENT SWITCH INDENT ELSE OUTDENT LEADING_WHEN LEADING_WHEN TERMINATOR IF ELSE IF ELSE POST_IF POST_IF UNARY - + -- ++ -- ++ ? + - MATH SHIFT COMPARE LOGIC RELATION COMPOUND_ASSIGN COMPOUND_ASSIGN INDENT OUTDENT EXTENDS", "bnf": { "Root": [ ["","return $$ = new yy.Block;",null], ["Body","return $$ = $1;",null], ["Block TERMINATOR","return $$ = $1;",null] ], "Body": [ ["Line","$$ = yy.Block.wrap([$1]);",null], ["Body TERMINATOR Line","$$ = $1.push($3);",null], ["Body TERMINATOR","$$ = $1;",null] ], "Line": [ ["Expression","$$ = $1;",null], ["Statement","$$ = $1;",null] ], ... </code></pre> <p>The above can be fed to the <a href="http://bottlecaps.de/convert/" rel="noreferrer">Jison-to-W3C grammar converter</a>, resulting in a grammar like this:</p> <pre><code>Root ::= ( Body | Block TERMINATOR )? Body ::= Line ( TERMINATOR Line | TERMINATOR )* Line ::= Expression | Statement ... </code></pre> <p>From here we can have the <a href="http://bottlecaps.de/rr/ui" rel="noreferrer">Railroad Diagram Generator</a> create a syntax diagram:</p> <p><img src="https://i.stack.imgur.com/bnXkR.png" alt="CoffeeScript Syntax Diagram"></p> <p>. . .</p> <p>Note that the converter only evaluates the "bnf" part of the grammar, so it does not take the token definitions into account. This could be improved by doing some manual postprocessing of the W3C-style grammar.</p>
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    1. COIt's just wonderful, thank you very much. Just accepting it and voting it up seems so little :) I used `JSON.stringify(grammar)` instead of an alert.
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      1. USAdam Schmideg
    2. CO@AdamSchmideg, glad to know that you like it. Keep in mind that the conversion tool is still under development, and far from perfect. However I will make serious attempts to repair any reported deficiencies.
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    3. COcare to post, like, the complete source you fed into the grammar converter? such a RR diagram would be utterly useful for me! i managed to make grammar.js spill its representation, i did wrap it like you show, but still the converter complains that "lexical analysis failed while expecting IdentifierName at line 413, column 1" which happens to be EOF. or paste the entire grammar for simplicity? i'd love to do it myself, tho.
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