Use more precise Use_::TYPE_* types (#945)

For better static analysis support in consuming projects.

Indent heredoc/nowdoc when targeting PHP >= 7.3

Default pretty printer to PHP 7.4

Update PHP versions in workflow

Add more property types

Some of these are not maximally accurate due to lack of union
types.

Update phpstan baseline

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invali

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invalid programs.

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Remove emulation for unsupported PHP versions

Raise minimum PHP version to PHP 7.4

Replace startLexing() with tokenize()

For now Lexer::getTokens() still exists, but should probably be
removed.

Fixup line numbers when applying emulator patches

This fixes the test failures on PHP 7.2.

Fix PhpStan errors

Move attribute handling into parser

The Lexer now only provides the tokens to the parser, while the
parser is responsible for determining which attributes are placed
on notes. This o

Move attribute handling into parser

The Lexer now only provides the tokens to the parser, while the
parser is responsible for determining which attributes are placed
on notes. This only needs to be done when the attributes are
actually needed, rather than for all tokens.

This removes the usedAttributes lexer option (and lexer options
entirely). The attributes are now enabled unconditionally. They
have less overhead now, and the need to explicitly enable them for
some use cases (e.g. formatting-preserving printing) doesn't seem
like a good tradeoff anymore.

There are some additional changes to the Lexer interface that
should be done after this, and the docs / upgrading guide haven't
been adjusted yet.

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Make use of default actions

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

Don't set start attributes for whitespace

These will get overwritten later anyway.

Allow passing visitors to NodeTraverser constructor

Minor documentation updates

Early return false after VariadicPlaceholder check on CallLike::isFirstClassCallable() (#924)

VariadicPlaceholder can only occur as the first (and only) argument, so avoid a loop to check fo

Early return false after VariadicPlaceholder check on CallLike::isFirstClassCallable() (#924)

VariadicPlaceholder can only occur as the first (and only) argument, so avoid a loop to check for it.

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Update main.yml to use GitHub Actions V3

Updates the GitHub Actions from V2 to V3

(cherry picked from commit 1d0748ad35201d483816634dd4bfe55a6f26d857)

Release PHP-Parser 5.0.0-alpha3

Don't take subnodes by reference when traversing

Explicitly assign the property where necessary to avoid the
creation of unnecessary reference-wrappers everywhere.

Remove unnecessary Node return value from traverseNode()

The node always stays the same: We may only change subnodes.

Some documentation updates

Update CHANGELOG and UPGRADING

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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