Handle flexible heredoc via TokenEmulator

Extend the interface to support preprocessing.

Refactor token emulator registration

Only determine needed emulators based on PHP version once, and
add an adaptor that allows treating forward and reverse emulation
the same.

Refactor token emulator registration

Only determine needed emulators based on PHP version once, and
add an adaptor that allows treating forward and reverse emulation
the same.

Previously the isEmulationNeeded() check was too conservative,
as it also considered emulators that are not relevant for the
version. Though possibly that check should just be dropped
altogether.

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Add support for nullsafe operator

Add reverse emulation support

Accept a phpVersion option in emulative lexer

Testing this will require reverse emulation support.

Separate out emulator version info

[PHP 8.0] Add match expressions (#672)

RFC: https://wiki.php.net/rfc/match_expression_v2
Upstream implementation: php/php-src#5371

Closes #671.

Sync flexible heredoc emulation with label fix

This was recently fixed in PHP via
https://github.com/php/php-src/commit/310708845ff02b9e252b7a02616290384dd846ba
so we should fix it h

Sync flexible heredoc emulation with label fix

This was recently fixed in PHP via
https://github.com/php/php-src/commit/310708845ff02b9e252b7a02616290384dd846ba
so we should fix it here as well.

I'm not adding a dedicated test as it will fail until new PHP versions
are released. This is indirectly tested through the php-src tester.

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[PHP 7.4] Add support for numeric literal separators (#615)

Implements RFC https://wiki.php.net/rfc/numeric_literal_separator.

Closes #614.

Remove token registration from TokenEmulator interface

[PHP 7.4] Add support for arrow functions (#602)

Per RFC https://wiki.php.net/rfc/arrow_functions_v2.

Add support for ??= operator

Introduced in PHP 5.4, represented using an AssignOp\Coalesce node.

Make sure heredoc end label not followed by label char

Partial support for flexible heredoc/nowdoc

This only implements the token emulation part, it does not yet
handle the indentation stripping.

Emulating this feature on old PHP ve

Partial support for flexible heredoc/nowdoc

This only implements the token emulation part, it does not yet
handle the indentation stripping.

Emulating this feature on old PHP versions is really tough and is
not going to work perfectly, but hopefully this implementation is
"good enough".

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[CS] New line in the end of file

[CS] Remove extra lines

Add strict_types to lib code

[cs] remove unused imports

Drop emulative lexer implementation

Nothing to emulate anymore... Revert this commit when something
turns up.

Remove unused variables (#357)

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

Comment out code for handling new keywords

Drop support for PHP 5.5

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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