On Sun, Dec 6, 2009 at 4:19 AM, Kevin Curtis <[email protected]> wrote:
> Re the idea of standardizing a serialization format in JsonML of the
> ECMAScript AST based on the ECMAScript grammar.
>
> The ecmascript-ast project's JSON.AST.parse() function now serializes
> all of the grammar/AST to JsonML (I think). JSON.AST.evaluate() is
> rudimentary (example.js and ast-test/if.js and while.js work!) The
> code to build JSON.AST on V8 is at:
> http://code.google.com/p/ecmascript-ast/
I am eager to see such a proposal. However, on your pages, I could not
find any documentation, other than small examples, showing what your
proposed encoding of JS ASTs in JSON is. Are you writing a draft spec?
> JSON.AST - like the JSON object - could initially be implemented in
> pure javascript. (evaluate() could parse JsonML and generate JS which
> could then be eval'ed). Then engines could determine whether to do
> native implementations. A native JSON.AST.parse() outputting JsonML
> should be relatively straighforward. JSON.AST.evaluate() is more
> tricky - 2 alternatives. Parse and execute the JsonML directly. Or
> parse the JsonML to JS - and then the JS can be eval'ed. (A JsonML to
> JS function is probably desirable in any case).
>
> Here's an example of parsing JS source to JsonML AST:
>
>>./ast.sh ast-test/while.js
> --- js source ---
> x = 1;
> while (x < 5) { print(x); x = x + 1; };
>
> --- ast ---
> ["Program",
> ["ExprStmt",
> ["Assign",
> {"op":"="},
> ["Id",
> {"name":"x"}
> ],
> ["Literal",
> {"handle":1}
> ]
> ]
> ],
> ["While",
> ["CompareOp",
> {"op":"<"},
> ["Id",
> {"name":"x"}
> ],
> ["Literal",
> {"handle":5}
> ]
> ],
> ["Block",
> ["ExprStmt",
> ["Call",
> ["Id",
> {"name":"print"}
> ],
> ["Id",
> {"name":"x"}
> ]
> ]
> ],
> ["ExprStmt",
> ["Assign",
> {"op":"="},
> ["Id",
> {"name":"x"}
> ],
> ["BinOp",
> {"op":"+"},
> ["Id",
> {"name":"x"}
> ],
> ["Literal",
> {"handle":1}
> ]
> ]
> ]
> ]
> ]
> ]
> ]
>
> --- evaluate(ast) ---
> 1
> 2
> 3
> 4
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--
Cheers,
--MarkM
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