Mention in docs that ast\Node\Decl is no longer used

Mark versions 45 and 50 as supported.

Add CLOSURE_USE_REF flag

With the CLOSURE_ prefix to distinguish it from the namespace
USE_ flags.

Rename RETURNS_REF to FUNC_RETURNS_REF

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of s

In version 50+, return an empty statement list in \ast\parse_file

This makes \ast\parse_file and \ast\parse_code consistent.

file_get_contents has a similar check of the result of stream_read,
it will return the empty string if it returned null.

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Expose FUNC_GENERATOR flag

Don't use Decl nodes in version 50

Recognize "object" types in version 45

Also shift off the __declId change to version 50.

Move version into ast_state_info

Add a unique id to declarations in version 45+

For issue #58

The output of `var_dump(ast\parse_code('<?php function(){};function(){};', 45));`

will include '__declId' value

Add a unique id to declarations in version 45+

For issue #58

The output of `var_dump(ast\parse_code('<?php function(){};function(){};', 45));`

will include '__declId' values starting from 0.
The counter will reset if `parse_code` is called again,

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Deprecate version 30

Add constructors with parameters for Node (#55)

Signature: new Node(kind, flags, children, lineno)

Assume that the constructor is either never used with parameters
or used very

Add constructors with parameters for Node (#55)

Signature: new Node(kind, flags, children, lineno)

Assume that the constructor is either never used with parameters
or used very frequently (e.g. ast simplifier, code refactoring,
php-parser to ast conversion, etc.)
Validate the data types of params, but not the values themselves.

For backwards compatibility reasons, leave parameters
with no passed values as null, and make everything nullable.
- Assume no pre-existing code would pass in values.

This constructor hasn't been benchmarked yet
(compare with assigning params manually).
php-parser-to-php-ast (incomplete) is one codebase that could be used to
test this, e.g. in a loop.

Also, add aliases to simplify setting a Node property to a zend_long.
- AST_CACHE_SLOT_FLAGS was missing in one place, this PR added it back.
Was the absense deliberate?
- TRY_DELREF is unnecessary in some places, and wrong for parameters to
the constructor.

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Fix issue #51

Make attribute value for virtual nodes explicit, fix the nullable
case.

Mark 40 as current version

Drop support for version 20

Fix handling of ?array and ?callable

Wrap these in AST_NULLABLE_TYPE as well.

Update display of extension in phpinfo() (#39)

Fix PHP 7 build

Update USE_* flags for PHP 7.2

These now use ZEND_SYMBOL_*.

Fix issue #36

The emulation of PHP 7.0 list() structure did not account for
skipped elements.

Remove version 15

Remove version 10

Deprecate version 20, mark 35 as default

And fix the PHP 7.0 build again...

This code is getting damn ugly

Version 35: Backward/forward emulation of list() format

Expose PHP 7.1 ARRAY_SYNTAX flags