Similar to the previous commit: list() syntactically accepts any
expression and non-variables are compile-time errors. The special
case of ($a) ends up being legal by accident.
Partial fix for #653. PHP 7 allows expressions inside isset(), but
rejects non-variables in the compiler. A side-effect of this is that
isset(($x)) is allowed, though this is not intentional.
The token stream should cover all characters in the original code,
insert a dummy token for missing illegal characters. We should
really be doing this in token_get_all() as well.
Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
because the end attributes will be the at the last non-whitespace,
non-comment token, which might be quite far back. More problematically,
we may not have encountered any non-discarded token if we're at the
start of the file, in which case we will have no end attributes to
assign.
Change things to use a canonical "zero-length" node representation,
where the end position (token & file) will be exactly one before the
start position.
Fixes#589.
If indentation is invalid, we strip on a best-effort basis.
The error position information is not great, but I don't want to
introduce sub-token error positioning at this point in time.
Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get complicated now.
For now only implement the validation of the indentation on the
end label.
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".
The UseUse::$alias node can now be null if an alias is not
explicitly given. As such "use Foo\Bar" and "use Foo\Bar as Bar"
are now represented differently.
The UseUse->getAlias() method replicates the previous semantics,
by returning "Bar" in both cases.
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.
