Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/

Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/rfc/final_class_const).

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Add never type

This should be recognized as Identifier instead of Name now.

[PHP 8.1] Add support for enums (#758)

RFC: https://wiki.php.net/rfc/enumerations

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

ParserAbstract: add missing '*' to the phpdoc

Otherwise, it's somewhat incompatible with the phpdoc definition.

Fix #738 incorrect start line for traits

Empty productions are supposed to be assigned the start attributes
of the lookahead token. Currently, this happens by assigning above
the cur

Fix #738 incorrect start line for traits

Empty productions are supposed to be assigned the start attributes
of the lookahead token. Currently, this happens by assigning above
the current stack position when the token it read.

This fails in a situation where we first reduce an empty production
higher up in the stack, and then again reduce an empty production
lower in the stack, without consuming the lookahead token in the
meantime.

Fix this by moving the assignment into the reduction phase. We
also need to do this for error productions, which are effectively
empty.

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Remove self/parent/static restriction for namespace names

This no longer applies as of PHP 8.0.

Add support for the mixed type

Place Nop nodes more precisely

If the Nop is created to collect comments, place it directly after
the comment, instead of at the next non-whitespace character.

Add support for union types

We definitely need to introduce a general "Type" abstraction in
the next major version.

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
be

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
because the end attributes will be the at the last non-whitespace,
non-comment token, which might be quite far back. More problematically,
we may not have encountered any non-discarded token if we're at the
start of the file, in which case we will have no end attributes to
assign.

Change things to use a canonical "zero-length" node representation,
where the end position (token & file) will be exactly one before the
start position.

Fixes #589.

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add float/double/real KIND support to Cast\Double node

Flexible doc strings: Fix some issues, add more tests

Flexible doc: Validate and strip indentation

If indentation is invalid, we strip on a best-effort basis.

The error position information is not great, but I don't want to
introdu

Flexible doc: Validate and strip indentation

If indentation is invalid, we strip on a best-effort basis.

The error position information is not great, but I don't want to
introduce sub-token error positioning at this point in time.

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Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get compl

Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get complicated now.

For now only implement the validation of the indentation on the
end label.

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Remove unused ParserAbstract::$errors property

Leftover from before ErrorHandler was introduced.

Rename YYNLSTATES to numNonLeafStates

Clear parser state directly after parsing

I don't think this makes any difference in practical scenarios, but
it makes memory usage analysis simpler.

Fix PHP5 static call fixup

Variable nodes directly store the variable name as a string, they
don't use VarLikeIdentifier. So remove this wrapper if it exists.

Ensure nodes have full complement of location info

Handle Nop statement after brace-style namespace

Fixes #412.

Add strict_types to lib code

Add isSpecialClassName() method to Identifier and Name

Add toLowerString() method to Name and Identifier

Avoids patterns like strtolower((string) $name) when using
strict types.

[cs] use strict comparison where allowed

[cs] use PHP 5.4 short array, since PHP 7.0 is min version