[perl #114040] Parse formats in interpolating constructs

For re-evals, this is something that broke recently, post-5.16 (the
jumbo fix).  For other interpolating constructs, this has never
worked, as far as I can tell.

The lexer was losing track of PL_lex_state (aka PL_parser->lex_state)
when parsing formats.  Usually, the state alternates between
LEX_FORMLINE (a picture line) and LEX_NORMAL (an argument line), but
the LEX_NORMAL should actually be whatever the state was before the
format started.

This commit adds a new parser member to track the ‘normal’ state when
parsing a format.

It also tweaks S_scan_formline to handle multi-line buffers outside of
string eval (such as happens in interpolating constructs).

That bufend assignment that is removed as a result is not necessary as
of a0d0e21ea6ea (perl 5.000).  That very commit added a bufend assign-
ment after the sv_gets (later filter_gets; later lex_next_chunk) fur-
ther down in the loop in scan_formline.

1 files changed, 10 insertions, 1 deletions

diff --git a/t/comp/parser.t b/t/comp/parser.t
index ac6742e103..8ada9ab720 100644
--- a/t/comp/parser.t
+++ b/t/comp/parser.t
@@ -3,7 +3,7 @@
 # Checks if the parser behaves correctly in edge cases
 # (including weird syntax errors)
 
-print "1..137\n";
+print "1..138\n";
 
 sub failed {
     my ($got, $expected, $name) = @_;
@@ -388,6 +388,15 @@ is $::{waru}, undef, 'sub w attr+proto ignored after compilation error';
 is $::{iwa}, undef, 'non-empty sub decl ignored after compilation error';
 is *BEGIN{CODE}, undef, 'BEGIN leaves no stub after compilation error';
 
+$test = $test + 1;
+"ok $test - format inside re-eval" =~ /(?{
+    format =
+@<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+$_
+.
+write
+}).*/;
+
 # Add new tests HERE (above this line)
 
 # bug #74022: Loop on characters in \p{OtherIDContinue}