Distinguish between implicit/explicit alias

The UseUse::$alias node can now be null if an alias is not
explicitly given. As such "use Foo\Bar" and "use Foo\Bar as Bar"
are now repres

Distinguish between implicit/explicit alias

The UseUse::$alias node can now be null if an alias is not
explicitly given. As such "use Foo\Bar" and "use Foo\Bar as Bar"
are now represented differently.

The UseUse->getAlias() method replicates the previous semantics,
by returning "Bar" in both cases.

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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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Combine class/non-class name resolution into single method

Extract name resolution logic into NameContext

All the generic name resolution logic is now available as a separate
class with a public API.

Use null-coalesce operator

Remove leftover code

Perform NullableType resolution earlier

This makes sure function signatures are already fully resolved in
enterNode(). Resolves issue #360.

Improve doc comments

Update doc comments after previous comment

Make some of the type annotations more accurate, and complete the
generated doc-comments to be complete (with description and
parameter ann

Update doc comments after previous comment

Make some of the type annotations more accurate, and complete the
generated doc-comments to be complete (with description and
parameter annotations.)

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Add non-void return types

Fix issues reported by psalm

Add NameResolver mode that does not modify nodes

Add originalName attribute in NameResolver

For now gated behind a preserveOriginalNames option.

NameResolver - resolve Name in NullableType

Cleanup imports

Thanks PhpStorm :)

Represent empty Name::slice() using null

Instead of a Name([]) dummy value, that is invalid in other
contexts.

Explicitly support Name copy construction

It already worked beforehand by accident ... make clear it's
actually supported.

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the t

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the throwOnError option.

NameResolver now accepts an ErrorHandler in the ctor.

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Add namespacedName attribute on runtime-resolved names

The NameResolver now adds a namespacedName attribute on function/
const names which cannot be statically resolved.

PHP 7.1: Support multi-catch

Catch::$type is now an array Catch::$types.

Switch NameResolver resolve methods to be immutable

To make it theoretically possible to expose this as API.

Add slice() method to Name to allow this. Deprecate existing mutable

Switch NameResolver resolve methods to be immutable

To make it theoretically possible to expose this as API.

Add slice() method to Name to allow this. Deprecate existing mutable
Name APIs.

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Support mixed group use declarations

Add partial group use support

Supported via Stmt\GroupUse which has Name $prefix in addition to
the usual.

Still missing: Mixed group uses.

Add support for anonymous classes

Has not landed upstream yet, but syntax is unlikely to change.

Resolve param type hints earlier

For convenience of concurrent visitors that want to perform
enterNode actions based on Stmt\Function_ etc.

Fixes #188.