Fix regex

Don't use ~__EMU sequences in emulative lexer

These were necessary back in the day when we had to emulate some
complex functionality such as nowdoc strings. Now we can simply
directl

Don't use ~__EMU sequences in emulative lexer

These were necessary back in the day when we had to emulate some
complex functionality such as nowdoc strings. Now we can simply
directly translate certain token sequences.

The motivation for this change is to avoid preprocessing of the source
code, which would complicate offset-aware error handling inside the
lexer as offsets would no longer be correct.

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Remove support for PHP 5.4

Move token constants into separate class

As these are shared between Php5 and Php7 parsers they should be
in some common place, otherwise we'd have to always reference either
one or

Move token constants into separate class

As these are shared between Php5 and Php7 parsers they should be
in some common place, otherwise we'd have to always reference either
one or the other.

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Drop 5.4 support from emulative lexer

Add support for "yield from"

Add support for spaceship operator (<=>) [PHP 7]

Added as Expr\BinaryOp\Spaceship.

Add support for null coalesce operator (??) [PHP 7]

Added as Expr\BinaryOp\Coalesce.

Support file offsets in emulative lexer as well

Also run normal lexer tests against emulative lexer and fix a bug
in __halt_compiler() handling found as a result.

Use emulative lexer for < 5.6RC1

Earlier releases come with incorrect tokenizer data for T_POW and
T_POW_EQUAL.

Minor cleanups to emulative lexer

Be consistent about version numbers. We'll only emulate until
beta1 of a release, as that's the feature freeze release.

Fix ** emulation wrt comments

Add support for pow operator (PHP 5.6)

Add support for variadic parameters (PHP 5.6)

Port library to use namespaces, with BC for old names