Respect version mode line in pretty printer tests

By default parser uses newest supported and pretty printer uses
its default version. If version is specified, it's used for both
par

Respect version mode line in pretty printer tests

By default parser uses newest supported and pretty printer uses
its default version. If version is specified, it's used for both
parser and printer. Additionally, parserVersion can be used to
specify a different version for parser and printer.

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Fix ternary precedence printing

The precedence table set the LHS and RHS precedence for the
ternary to -1, which is the dummy value used for unary operators.
Instead, it should be th

Fix ternary precedence printing

The precedence table set the LHS and RHS precedence for the
ternary to -1, which is the dummy value used for unary operators.
Instead, it should be the same as the operator precedence, as
the ternary is non-associative since PHP 8.

Fixes #1009.

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Prevent merging of consecutive -/+ more thoroughly

The unary -/+ or --/++ might not be the direct child. Instead
determine this by actually printing the operand and checking
whether

Prevent merging of consecutive -/+ more thoroughly

The unary -/+ or --/++ might not be the direct child. Instead
determine this by actually printing the operand and checking
whether it starts with -/+.

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Support yield precedence

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 alw

Support yield precedence

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.

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Handle throw precedence

Now that this is an expression, we also need to handle precedence.

Properly support prefix operator precedence printing

The pretty printer is supposed to produce a minimal-parentheses
printing for expressions. However, for prefix operators, we were

Properly support prefix operator precedence printing

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).

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Respect precedence during clone pretty printing

Clone is the prefix operator with the highest operator precedence,
but was not treated as an operator at all.

Add additional test case for assignment precedence

This is a case where the parentheses around the assignment *are*
important.

Remove inc/dec from precedence map

Inc/dec are primitive expressions that only accept a variable
operand, rather than a general expression operand.

Fix #718: PrettyPrinter breaks nested ternaries

Mark ternary as non-associative operator, as left-associative use
is deprecated in PHP 7.4 and removed in PHP 8.0.

Handle +(++$x) and -(--$x) as well

Fix pretty printing of -(-$x) and +(+$x)

Fixes #459.

Split up pretty printer test in stmt/expr

The list was getting unweildly.

Also improve error message when parsing fails in pretty printer
test and extend some tests.