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continuation.js

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continuation.js

Continuation support for Node.js

  • 0.0.6
  • Source
  • npm
  • Socket score

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continuation.js

Continuation support for Node.js

  • It transforms JavaScript code into Continuation Passing Style (CPS) code in a best effort manner.
  • No new syntax or keyword is required.
  • Fallback mechanism works when CPS is not possible or not implemented.
  • Tail calls are properly handled.

How to use

GitHub

% git clone https://github.com/dai-shi/continuation.js.git
% ./bin/continuation-compile sample/fact.js > cps_fact.js

% cat sample/fact.js
function fact(x) {
  function fact_tail(x, r) {
    if (x === 0) {
      return r;
    } else {
      return fact_tail(x - 1, x * r);
    }
  }
  return fact_tail(x, 1);
}

% node -e "console.log(require('./sample/fact.js').fact(100000))"

.../continuation.js/sample/fact.js:2
  function fact_tail(x, r) {
                        ^
RangeError: Maximum call stack size exceeded

% node -e "console.log(require('./cps_fact.js').fact(100000))"
Infinity

NPM

% npm install continuation.js

and add the following:

require('continuation.js').enable_on_require();

which transforms all following .js files by require.

How it works

  • 4 classes are defined in the global scope.
    • CpsFunction
    • CpsContinuation
    • CpsResult
    • CpsRun
  • CPS enabled functions have the CpsEnabled=true property.
  • Traversing AST to transform into CPS, only when possible!
  • Keeping original code so that non-CPS is always possible.

Limitations

  • There are some overhead, obviously.
  • Not all calls are transformed into CPS.
  • new Function is not supported.

TODOs

  • Work with try...catch and throw.
  • Better documents.
  • Transform non-tail calls into CPS.
  • More tests.
  • Support for current continuations (feasible?)

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Package last updated on 28 Dec 2012

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