Address hoaproject/Central#81.

test(llk) Add test cases for the offset feature

Define minimal supported version of PHP needed into composer.json

Address hoaproject/Central#70.

When the parser backtracks, an error token is not always found if it
happens at the very first p...

Fix "strrpos()" bug when offset is greater than the length of haystack string

… for line instructions.

First, skip tokens were not correctly merge. For instance:

%skip a b
%skip c d
%ski...

It only contains static methods, it makes no sense to instanciate it.

`-1` is a special value representing infinity. This is useful for
repetition like `*`, `+` or `{...

An empty array would be better but it might break backward
compatibility for some users, so `nul...

It has been moved from a unit test suite to an integration test suite.

Thanks to the iterator API, we can grab the appropriated datum directly.

`parser.lookahead` is used by the parser to define the `k` in LL(k),
i.e. number of tokens to lo...

This way, we avoid the call of `setKept` and can set this flag directly
from the constructor.

This is a compiler-compiler. It means we have a grammar and we transform
it into a compiler. The...

To compute a name for transitional rules, we were previously counting
the number of rules and we...

Pragmas are useful when the grammar needs to change the behavior of the
compiler-compiler. For i...

`is_numeric` tests if the value is an integer or a string representing
an integer. Since the rul...

Removing the `getCurrentToken`, `getNextToken` and `consumeToken`
methods do not make the code l...