Remove support for alternative array syntax in PHP 8 parser

We cannot support both this syntax and property hooks. Drop
support for the alternative syntax in the PHP 8 parser. The
PH

Remove support for alternative array syntax in PHP 8 parser

We cannot support both this syntax and property hooks. Drop
support for the alternative syntax in the PHP 8 parser. The
PHP 7 parser still supports it.

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Use visitor to assign comments

This fixes the long-standing issue where a comment would get assigned
to all nodes with the same starting position, instead of only the
outer-most one.

Use visitor to assign comments

This fixes the long-standing issue where a comment would get assigned
to all nodes with the same starting position, instead of only the
outer-most one.

Fixes #253.

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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 newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Add named argument support

Not adding any explicit FPPP support, as I don't think add/remove
of names can be handled any better than full reformatting.

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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Perform automated test update

Fix new.test and code test runner

Using only the basename leads to collisions...

Add support for argument unpacking (PHP 5.6)

Fix Switch subnode order

Not that it makes much of a difference, but could have caused issues with
"out of order" visiting of nodes.

Fix parsing of new expressions in parenthesis

The new dereferencing syntaxes (new Foo)->bar and (new Foo)['bar'] were
causing a shift/reduce conflict with the '(' expr ')' rule. When

Fix parsing of new expressions in parenthesis

The new dereferencing syntaxes (new Foo)->bar and (new Foo)['bar'] were
causing a shift/reduce conflict with the '(' expr ')' rule. When
(new Foo) was encountered (without dereference operators following) the
parser thus threw a parse error.

The fix simply adds a special '(' new_expr ')' rule to expr. This does not
remove the shift/reduce conflict itself, but makes it irrelevant.

This fixes issue #20.

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Insert comments when pretty printing

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