Fix attribute assignment for Error nodes

Support recovery from free-standing $

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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Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the assoc

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the associated error range has been improved using the new
end attribute stack.

To achieve this the error handling code has been moved out of the
node constructors and into special methods in the parser.

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Fix GroupUse prefix attribute assignment

Support recovery from lexer errors

Lexer::startLexing() no longer throws, instead errors can be fetched
using Lexer::getErrors().

Lexer errors now also contain full line and pos

Support recovery from lexer errors

Lexer::startLexing() no longer throws, instead errors can be fetched
using Lexer::getErrors().

Lexer errors now also contain full line and position information.

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Catch lexer errors in throwOnError=0 mode

Decrement errorState when recovering from -> error

It's likely that an error after -> will trigger another one due to
missing semicolon without shifting a single token. We prevent an

Decrement errorState when recovering from -> error

It's likely that an error after -> will trigger another one due to
missing semicolon without shifting a single token. We prevent an
immediate failure in this case by manually setting errorState to 2,
which will suppress the duplicate error message, but allow error
recovery.

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Fix computation of expected tokens in parse errors

PHP 7.1: Add void+iterable support

In PHP 7 mode, these will now be represented as strings 'void'
and 'iterable'.

Allow nop statements before namespace declaration

Fix nop statement comment assignment

Keep around the start attributes on the lookahead token around in
a separate parser property.

Support hashbang before namespace declaration

Fixes issue #243.

Rename ParserInterface to Parser

And drop the alias of Parser to Parser\Php5.

Support scalar type declarations

Fork separate PHP 7 parser

Also add ParserInterface

Add some more tests

Enable basic error recovery

Adding only a single recovery rule for now.

The API is now:
* throwOnError parser option must be disabled.
* List of Errors is available throug

Enable basic error recovery

Adding only a single recovery rule for now.

The API is now:
* throwOnError parser option must be disabled.
* List of Errors is available through $parser->getErrors(). This
method is available either way.
* If no recovery is possible $parser->parse() will return null.
(Obviously only if throwOnError is disabled).

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Poison attribute initializations in parser

Those should error if they end up being used.

Clarify attribute assignment code

* Don't assign to attribute stack on reduce - why was that there
in the first place?
* Assign attributes to the position in the stack where the firs

Clarify attribute assignment code

* Don't assign to attribute stack on reduce - why was that there
in the first place?
* Assign attributes to the position in the stack where the first
token of the production is, instead of one position earlier.
* Add a comment to clarify why we also assign attributes on read,
instead of just on shift.

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Build node attributes inside semantic action methods

Minor performance improvement for parsing, also allows to access
attributes with higher granulity in the parser, though this is not

Build node attributes inside semantic action methods

Minor performance improvement for parsing, also allows to access
attributes with higher granulity in the parser, though this is not
currently done.

* #n can now be used to access the stack position of a token. $n
is the same as $this->semStack[#n]. (Post-translate $n will
actually be the stack position.)
* $attributeStack is now $this->startAttributeStack and
$endAttributes is now $this->endAttributes.
* Attributes for a node are now computed inside the individual
reduction methods, instead of being passed as a parameter.
Accessible through the attributes() macro.

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Merge primary error recovery code

The grammar does not yet actually implement error recovery.

Test parser position information (syntax errors)

Make Error column info attribute based

added column-numbers to syntax errors