Doc strings have a trailing \n and these will get interpreted as
\r\n and removed from the string contents.
For nowdoc, fall back to single quote if there's a trailing \r.
For heredoc, escape all isolated \r -- unlike \n and \r\n this is
really a special character, because this is no longer relevant as
an actual newline character.
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.
The pretty printer is supposed to produce a minimal-parentheses
printing for expressions. However, for prefix operators, we were
failing to do so in ways that are practically meaningful, e.g.
$a = yield from $b produced redundant parentheses around the
yield from.
For prefix operators, the precedence of the direct parent operator
is not actually relevant: What matters is the precedence of any
infix operator whose LHS it appears on. For example, $a . include $b
does not require parentheses, but (include $a) . $b does.
To handle this, keep separate track of the parent operator
precedence, and a special LHS precedence which is used for unary
operator printing only. Because the LHS precedence may not come
from the direct parent, we have to pass it down the call stack.
And if we do that, we may as well do the same for the parent
precedence.
This also fixes an integration test failure with php-src, because
arrow function precedence was previously not respected (and would
be ugly to respect without this change).
When detecting whether the string contains the end label, allow
leading whitespace in front of it. This is legal since the
introduction of flexible doc strings.
With the introduction of flexible doc strings, the ending label
is no longer required to be followed by a semicolon or newline.
We need to prevent doc string printing if the label is followed
by any non-label character.
This makes pretty printing round trip to another Float literal,
rather than a constant lookup. The 1e1000 form in particular is
chosen because that seems to be the typical form used in various
tests.
If dropping a node would drop PHP tags, bail out of formatting
preservation. This will lose formatting, but at least produce
legal code.
Closes GH-884.
This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from readonly properties with DNF types. We have to uglify the
grammar to avoid some shift/reduce conflicts. Thank you WordPress.
