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Upgrade esprima to esprima-fb and update docs.

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Ingvar Stepanyan 2014-07-11 02:00:53 +03:00
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README.md
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This is modification of [Acorn][acorn] - a tiny, fast JavaScript parser, written completely in JavaScript.
It was forked to create experimental, alternative, faster [React.js JSX][jsx] parser since, according to
[benchmarks](http://marijnhaverbeke.nl/acorn/test/bench.html), Acorn is 5x faster than Esprima when parsing code
with location tracking (call it "source maps enabled mode"), and JSX extensions almost don't affect those numbers.
It was forked to create experimental, alternative, faster [React.js JSX][jsx] parser by integrating pieces
of code from official parser, modified to match Acorn's parsing logic.
This parser was created by integrating pieces of code from official parser, modified to match Acorn's parsing logic.
According to [benchmarks](http://marijnhaverbeke.nl/acorn/test/bench.html), Acorn is 5x faster than Esprima
when parsing code with location tracking (call it "source maps enabled mode"), and JSX extensions almost don't
affect those numbers. However, [esprima-fb](https://github.com/facebook/esprima) is forked&maintained from
harmony branch of esprima which is being heavily optimized and currently `acorn-jsx` is only 1.5-2x faster than
`esprima-fb`.
Currently, it consumes all the ES5+JSX syntax that can be consumed by official [Esprima-based parser][esprima-fb].
However, official parser can consume ES6 syntax as well, and is maintained by authors of React.js itself, so it's preferred to be used in real projects.
However, official parser can consume ES6 syntax as well, and is maintained by authors of React.js itself, so it's
preferred to be used in real projects.
[acorn]: http://marijnhaverbeke.nl/acorn/
[esprima-fb]: https://github.com/facebook/esprima

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