Slow Parser Initialization.

[bd82]

The Problem:

The first initialization and/or running of a parser instance may be very slow.
This only happens on the first initialization or parsing due to a very ineffective algorithm
used to compute the lookahead functions.

This only happens with some grammars:

Temporary Workaround for 99% of use cases:

Pass a smaller than the default (5) maxLookahead in the parser's constructor:

function CssParser(input) {
        chevrotain.Parser.call(this, input, cssTokens, {
                maxLookahead : 3 // by default this is 5
            });
        ...