Argument alignment across multiple lines should
match the open parenthesis.
Logical continuations should be at the end of
the previous line, not the start of a new line.
These are not required by CodingStyle so make the
tests active only when using --strict.
Improved_by_examples_from: "Bruce W. Allen" [off-list ref]
Signed-off-by: Joe Perches <joe@perches.com>
---
V2: Scan the entire line for balanced parentheses,
use the position of the last non-balanced open parenthesis.
Allow all space indentation too, checkpatch will complain
in a different message about that if it's too long.
scripts/checkpatch.pl | 65 +++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 63 insertions(+), 2 deletions(-)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 89d24b3..7a0514b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -330,10 +330,11 @@ sub build_types {
}
build_types();
-our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;
+our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
+our $lval_parens = qr/(\((?:[^\(\)]+|(-1))*\))/;
our $Typecast = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
-our $LvalOrFunc = qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
+our $LvalOrFunc = qr{($Lval)\s*($lval_parens{0,1})\s*};
our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
sub deparenthesize {@@ -1330,6 +1331,36 @@ sub check_absolute_file {
}
}
+sub pos_last_openparen {
+ my ($line) = @_;
+
+ my $pos = 0;
+
+ my $opens = $line =~ tr/\(/\(/;
+ my $closes = $line =~ tr/\)/\)/;
+
+ my $last_openparen = 0;
+
+ if (($opens == 0) || ($closes >= $opens)) {
+ return -1;
+ }
+
+ my $len = length($line);
+
+ for ($pos = 0; $pos < $len; $pos++) {
+ my $string = substr($line, $pos);
+ if ($string =~ /^($FuncArg|$balanced_parens)/) {
+ $pos += length($1);
+ }
+
+ if (substr($line, $pos, 1) eq '(') {
+ $last_openparen = $pos;
+ }
+ }
+
+ return $last_openparen + 1;
+}
+
sub process {
my $filename = shift;
@@ -1783,6 +1814,36 @@ sub process {
"please, no space before tabs\n" . $herevet);
}
+# check for && or || at the start of a line
+ if ($rawline =~ /^\+\s*(&&|\|\|)/) {
+ CHK("LOGICAL_CONTINUATIONS",
+ "Logical continuations should be on the previous line\n" . $hereprev);
+ }
+
+# check multi-line statement indentation matches previous line
+ if ($prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/) {
+ $prevline =~ /^\+(\t*)(.*)$/;
+ my $oldindent = $1;
+ my $rest = $2;
+
+ my $pos = pos_last_openparen($rest);
+ if ($pos >= 0) {
+ $line =~ /^\+([ \t]*)/;
+ my $newindent = $1;
+
+ my $goodtabindent = $oldindent .
+ "\t" x ($pos / 8) .
+ " " x ($pos % 8);
+ my $goodspaceindent = $oldindent . " " x $pos;
+
+ if ($newindent ne $goodtabindent &&
+ $newindent ne $goodspaceindent) {
+ CHK("PARENTHESIS_ALIGNMENT",
+ "Alignment should match open parenthesis\n" . $hereprev);
+ }
+ }
+ }
+
# check for spaces at the beginning of a line.
# Exceptions:
# 1) within comments