Avoid cyclic reference in parser

Pass $this as an explicit $self argument to the reduce callbacks,
so we can make them static. This avoids a circular reference in
the parser, so that

Avoid cyclic reference in parser

Pass $this as an explicit $self argument to the reduce callbacks,
so we can make them static. This avoids a circular reference in
the parser, so that it can be immediately destroyed when it goes
out of scope.

Fixes #980.

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Don't parse unicode escapes for PHP < 7.0

We still had the option for this but were hardcoding it to true.
Make it conditional on the PHP version instead.

Make use of default actions

For the default action $$ = $1, save the closure invocation.

Add missing return types

Introduce separate Modifiers class

Use PhpParser\Modifiers::PUBLIC instead of
PhpParser\Node\Stmt\Class_::MODIFIER_PUBLIC, etc. Old constants
of course remain available.

Fix

Introduce separate Modifiers class

Use PhpParser\Modifiers::PUBLIC instead of
PhpParser\Node\Stmt\Class_::MODIFIER_PUBLIC, etc. Old constants
of course remain available.

Fixes #476.

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Add visibility modifiers to constants

Closes GH-848.

Add PHP 8 parser with correct concatenation precedence

The PHP 7 and PHP 8 parsers use the same grammar file and only
differ in token precedence.

Move Tokens::T_* to Php7::T_*

Drop the separate tokens class, move them into the parser.

Add missing strict_types=1 directive to parser

Rename YYNLSTATES to numNonLeafStates

Use closures instead of methods for semantic actions

The dispatch using $this->{'reduceRule' . $rule}() is very expensive
because it involves
* One allocation when converting $rule

Use closures instead of methods for semantic actions

The dispatch using $this->{'reduceRule' . $rule}() is very expensive
because it involves
* One allocation when converting $rule to a string
* Another allocation when concatenating the two strings
* Lowercasing during the method call
* Various uncached method checks, e.g. visibility.

Using an array of closures for semantic action dispatch is
significantly more efficient.

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Use local var for $stackPos

We're accessing $this->stackPos a lot, and property accesses are
much more expensive than local variable acesses. Its cheaper to
use a local var and pass

Use local var for $stackPos

We're accessing $this->stackPos a lot, and property accesses are
much more expensive than local variable acesses. Its cheaper to
use a local var and pass it as an argument to semantic actions.

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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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