Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invalid programs.
In formatting-preserving pretty printing, treat DEL as a label
character based on the target PHP version (the default of 7.1
implying it isn't one).
This avoids failure to round-trip an unchanged input.
Since PHP 7.0 yield is a proper expression, so print it with
proper precedence. If the pretty printer is configured for
older version (non-default), then always print parentheses.
There is an interesting interaction here, in that => is resolved
in favor of yield if the yield occurs as part of an array (or
outer yield). This kind of bypasses the entire precedence hierarchy
and *only* affects yield expressions. For the sake of simplicity
this is modeled via normal LHS precedence, because this will only
add unnecessary parentheses to a handful of low precedence unary
operators. If desired, a special marker for this purpose could be
added though.
Listing these is not strictly necessary, in that array/callable
are keywords, and as such don't use the relevant code path. We
can still include them for the sake of completeness.
Closes#872.
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.
