get_abi.pl: fix xref boundaries

There are some issues with the regex that seeks for What:
cross references: basically, it is mis-identifying the start
and the end boundaries of the regex, which causes :ref: to
be inseerted for the wrong symbols at the wrong places.

Fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/79a14d2518499b76931b5f29c50979987108152d.1616668017.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 3c82cd1..e870282 100755 (executable)
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -281,8 +281,11 @@ sub create_labels {
 # Outputs the book on ReST format
 #
 
-# \b doesn't work well with paths. So, we need to define something else
-my $bondary = qr { (?<![\w\/\`\{])(?=[\w\/\`\{])|(?<=[\w\/\`\{])(?![\w\/\`\{]) }x;
+# \b doesn't work well with paths. So, we need to define something else:
+# Boundaries are punct characters, spaces and end-of-line
+my $start = qr {(^|\s|\() }x;
+my $bondary = qr { ([,.:;\)\s]|\z) }x;
+my $xref_match = qr { $start(\/sys\/[^,.:;\)\s]+)$bondary }x;
 my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;
 
 sub output_rest {
@@ -390,16 +393,18 @@ sub output_rest {
                                        $desc =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
                                }
 
-                               @matches = $desc =~ m,$bondary(/sys/[^\s\.\,\;\:\*\s\`\'\(\)]+)$bondary,;
+                               # Seek for cross reference symbols like /sys/...
+                               @matches = $desc =~ m/$xref_match/g;
 
                                foreach my $s (@matches) {
+                                       next if (!($s =~ m,/,));
                                        if (defined($data{$s}) && defined($data{$s}->{label})) {
                                                my $xref = $s;
 
                                                $xref =~ s/$symbols/\\$1/g;
                                                $xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
 
-                                               $desc =~ s,$bondary$s$bondary,$xref,g;
+                                               $desc =~ s,$start$s$bondary,$1$xref$2,g;
                                        }
                                }