[8.4] Add support for property hooks

Add hooks subnode to Stmt\Property and Param, which contains an
array of PropertyHook.

The property hook support is considered experimental

[8.4] Add support for property hooks

Add hooks subnode to Stmt\Property and Param, which contains an
array of PropertyHook.

The property hook support is considered experimental and subject
to change.

RFC: https://wiki.php.net/rfc/property-hooks

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Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this

Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this
representation measurably improves memory usage and performance.

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Add support for typed constants

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

Rename Stmt\PropertyProperty to PropertyItem

Remove MODIFIER_ prefix from node dumps

These constants are now called Modifiers::PUBLIC rather than
Class_::MODIFIER_PUBLIC etc, so update the dumped name as well.

Rename Expr\ArrayItem to ArrayItem

Array items are not expressions by themselves.

Change print order of modifiers

Print abstract/final before visibility modifiers, in line with
PSR-12.

Closes #826.

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
n

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
nodes that can have attributes.

This is still missing FPPP support.

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

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Add constructor promotion support

Add PHP 7.4 typed properties support

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node constructors still accepts strings and will implicitly create
an Identifier wrapper. Identifier implement __toString(), so that
outside of strict-mode many things continue to work without changes.

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Renamve Param::$name to Param::$var

As it now contains a Variable node.

Enforce useConsistentVariableNames

NodeDumper: Print modifiers as strings

Rename $type subnode to $flags

Type makes it sound like a type-hint, and on a number of other nodes
$type is used for exactly that. Use $flags to hold modifiers instead.

PHP 7.1: Class constant visibility support

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
suppo

Add support for return type declarations [PHP 7]

This adds an additional "returnType" subnode to Stmt\Function_,
Stmt\ClassMethod and Expr\Closure, as well as the corresponding
support in the name resolver and pretty printer.

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Guarantee that subnodes are always in the right order

Insert comments when pretty printing

This changset also adds unit tests for Comments and adds a way to test the
pretty printer.