Improve heuristic for escaping in single quoted strings

It is idiomatic to not escape backslashes if they are followed by
a non-special character.

Treat assignments as unary operators

Assignment expressions can be viewed as unary operators where
the whole "$x =" part is the operator.

Remove inc/dec from precedence map

Inc/dec are primitive expressions that only accept a variable
operand, rather than a general expression operand.

Add a phpVersion option to the pretty printer

This is currently just used to initialize the default for short
array syntax.

The default target version in 7.0, which also means t

Add a phpVersion option to the pretty printer

This is currently just used to initialize the default for short
array syntax.

The default target version in 7.0, which also means that the
default for short arrays is flipped to on.

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No superfluous elseif

Replaces superfluous elseif with if.

Short scalar cast

Cast (boolean) and (integer) should be written as (bool) and (int), (double) and (real) as (float), (binary) as (string).

Rename Expr\ClosureUse -> ClosureUse

This is not a real expression, treat it similarly to Node\Arg
or Node\Param.

The old name is retained as an alias for compatibility.

Include space after closure use

Remove space before return type in pretty printer

Add some missing type annotations

Don't make VariadicPlaceholder an expression

And don't store it in an Arg.

Add support for first-class callables

I'm somewhat unsure about the AST structure here.
VariadicPlaceholder is not a general expression. Maybe Arg->expr
should be Expr|VariadicPlaceh

Add support for first-class callables

I'm somewhat unsure about the AST structure here.
VariadicPlaceholder is not a general expression. Maybe Arg->expr
should be Expr|VariadicPlaceholder? Or possibly the call arguments
should be an array of Arg|VariadicPlaceholder?

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Add support for intersection types

Add handling for Enum(Case)s in NameResolver

Make sure match is one character long

Escape invalid UTF-8 in strings

To be friendlier to tooling that expects PHP files to be UTF-8
encoded, escape any sequences that are not legal under UTF-8.

Use hex escaping for special characters in strings

Apart from \0, using the \xHH notation is more typical.

[PHP 8.1] Add support for enums (#758)

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

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

Upgrade some PrettyPrinter methods to protected

I noticed some methods in the Standard PrettyPrinter is private, can they be upgraded to `protected` to ease when extending it?

[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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Fix casing of class name

Add parens for new/instanceof with complex expression

This is not fully accurate because the rules for "new variables"
are different than the rules for dereferenceable LHS.

Wrap class const LHS in parens if necessary

This looks like a very old bug in the pretty printer that showed
up in PHP 8 tests.

Add support for throw expression

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.