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43b2e9e008
openssl/util/check-format.pl
Dr. David von Oheimb 43b2e9e008 check-format.pl: Add check for multiples essentially empty lines in a row 
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12270)
2020-07-20 11:17:34 +02:00

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#!/usr/bin/perl
#
# Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
# Copyright Siemens AG 2019-2020
#
# Licensed under the Apache License 2.0 (the "License").
# You may not use this file except in compliance with the License.
# You can obtain a copy in the file LICENSE in the source distribution
# or at https://www.openssl.org/source/license.html
#
# check-format.pl
# - check formatting of C source according to OpenSSL coding style
#
# usage:
# check-format.pl [-l|--sloppy-len] [-l|--sloppy-bodylen]
# [-s|--sloppy-spc] [-c|--sloppy-cmt] [-m|--sloppy-macro]
# [-h|--sloppy-hang] [-1|--1-stmt]
# <files>
#
# checks adherence to the formatting rules of the OpenSSL coding guidelines
# assuming that the input files contain syntactically correct C code.
# This pragmatic tool is incomplete and yields some false positives.
# Still it should be useful for detecting most typical glitches.
#
# options:
# -l | --sloppy-len increase accepted max line length from 80 to 84
# -l | --sloppy-bodylen do not report function body length > 200
# -s | --sloppy-spc do not report whitespace nits
# -c | --sloppy-cmt do not report indentation of comments
# Otherwise for each multi-line comment the indentation of
# its lines is checked for consistency. For each comment
# that does not begin to the right of normal code its
# indentation must be as for normal code, while in case it
# also has no normal code to its right it is considered to
# refer to the following line and may be indented equally.
# -m | --sloppy-macro allow missing extra indentation of macro bodies
# -h | --sloppy-hang when checking hanging indentation, do not report
# * same indentation as on line before
# * same indentation as non-hanging indent level
# * indentation moved left (not beyond non-hanging indent)
# just to fit contents within the line length limit
# -1 | --1-stmt do more aggressive checks for { 1 stmt } - see below
#
# There are non-trivial false positives and negatives such as the following.
#
# * When a line contains several issues of the same kind only one is reported.
#
# * When a line contains more than one statement this is (correctly) reported
# but in some situations the indentation checks for subsequent lines go wrong.
#
# * There is the special OpenSSL rule not to unnecessarily use braces around
# single statements:
# {
# stmt;
# }
# except within if ... else constructs where some branch contains more than one
# statement. Since the exception is hard to recognize when such branches occur
# after the current position (such that false positives would be reported)
# the tool by checks for this rule by defaul only for do/while/for bodies.
# Yet with the --1-stmt option false positives are preferred over negatives.
# False negatives occur if the braces are more than two non-empty lines apart.
#
# * Use of multiple consecutive spaces is regarded a coding style nit except
# when done in order to align certain columns over multiple lines, e.g.:
# # define AB 1
# # define CDE 22
# # define F 3333
# This pattern is recognized - and consequently double space not reported -
# for a given line if in the nonempty line before or after (if existing)
# for each occurrence of " \S" (where \S means non-space) in the given line
# there is " \S" in the other line in the respective column position.
# This may lead to both false negatives (in case of coincidental " \S")
# and false positives (in case of more complex multi-column alignment).
#
# * When just part of control structures depend on #if(n)(def), which can be
# considered bad programming style, indentation false positives occur, e.g.:
# #if X
# if (1) /* bad style */
# #else
# if (2) /* bad style resulting in false positive */
# #endif
# c; /* resulting further false positive */
use strict;
# use List::Util qw[min max];
use POSIX;
use constant INDENT_LEVEL => 4;
use constant MAX_LINE_LENGTH => 80;
use constant MAX_BODY_LENGTH => 200;
# global variables @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
# command-line options
my $max_length = MAX_LINE_LENGTH;
my $sloppy_bodylen = 0;
my $sloppy_SPC = 0;
my $sloppy_hang = 0;
my $sloppy_cmt = 0;
my $sloppy_macro = 0;
my $extended_1_stmt = 0;
while ($ARGV[0] =~ m/^-(\w|-[\w\-]+)$/) {
my $arg = $1; shift;
if ($arg =~ m/^(l|-sloppy-len)$/) {
$max_length += INDENT_LEVEL;
} elsif ($arg =~ m/^(b|-sloppy-bodylen)$/) {
$sloppy_bodylen = 1;
} elsif ($arg =~ m/^(s|-sloppy-spc)$/) {
$sloppy_SPC = 1;
} elsif ($arg =~ m/^(c|-sloppy-cmt)$/) {
$sloppy_cmt = 1;
} elsif ($arg =~ m/^(m|-sloppy-macro)$/) {
$sloppy_macro = 1;
} elsif ($arg =~ m/^(h|-sloppy-hang)$/) {
$sloppy_hang = 1;
} elsif ($arg =~ m/^(1|-1-stmt)$/) {
$extended_1_stmt = 1;
} else {
die("unknown option: -$arg");
}
}
# status variables
my $self_test; # whether the current input file is regarded to contain (positive/negative) self-tests
my $line; # current line number
my $line_before; # number of previous not essentially empty line (containing at most whitespace and '\')
my $line_before2; # number of not essentially empty line before previous not essentially empty line
my $contents; # contents of current line
my $contents_before; # contents of $line_before, if $line_before > 0
my $contents_before_; # contents of $line_before after blinding comments etc., if $line_before > 0
my $contents_before2; # contents of $line_before2, if $line_before2 > 0
my $contents_before_2; # contents of $line_before2 after blinding comments etc., if $line_before2 > 0
my $in_multiline_string; # line starts within multi-line string literal
my $count; # -1 or number of leading whitespace characters (except newline) in current line,
# which should be $block_indent + $hanging_offset + $local_offset or $expr_indent
my $count_before; # number of leading whitespace characters (except line ending chars) in $contents_before
my $has_label; # current line contains label
my $local_offset; # current extra indent due to label, switch case/default, or leading closing brace(s)
my $line_body_start; # number of line where last function body started, or 0
my $line_function_start; # number of line where last function definition started, used if $line_body_start != 0
my $last_function_header; # header containing name of last function defined, used if $line_function_start != 0
my $line_opening_brace; # number of previous line with opening brace after do/while/for, optionally for if/else
my $keyword_opening_brace; # name of previous keyword, used if $line_opening_brace != 0
my $ifdef__cplusplus; # line before contained '#ifdef __cplusplus' (used in header files)
my $block_indent; # currently required normal indentation at block/statement level
my $hanging_offset; # extra indent, which may be nested, for just one hanging statement or expr or typedef
my @in_do_hanging_offsets; # stack of hanging offsets for nested 'do' ... 'while'
my @in_if_hanging_offsets; # stack of hanging offsets for nested 'if' (but not its potential 'else' branch)
my $if_maybe_terminated; # 'if' ends and $hanging_offset should be reset unless the next line starts with 'else'
my @nested_block_indents; # stack of indentations at block/statement level, needed due to hanging statements
my @nested_hanging_offsets;# stack of nested $hanging_offset values, in parallel to @nested_block_indents
my @nested_in_typedecl; # stack of nested $in_typedecl values, partly in parallel to @nested_block_indents
my @nested_indents; # stack of hanging indents due to parentheses, braces, brackets, or conditionals
my @nested_symbols; # stack of hanging symbols '(', '{', '[', or '?', in parallel to @nested_indents
my @nested_conds_indents; # stack of hanging indents due to conditionals ('?' ... ':')
my $expr_indent; # resulting hanging indent within (multi-line) expressions including type exprs, else 0
my $hanging_symbol; # character ('(', '{', '[', not: '?') responsible for $expr_indent, if $expr_indent != 0
my $in_expr; # in expression after if/while/for/switch/return/enum/LHS of assignment
my $in_paren_expr; # in parenthesized if/while/for condition and switch expression, if $expr_indent != 0
my $in_typedecl; # nesting level of typedef/struct/union/enum
my $in_directive; # number of lines so far within preprocessor directive, e.g., macro definition
my $directive_nesting; # currently required indentation of preprocessor directive according to #if(n)(def)
my $directive_offset; # indent offset within multi-line preprocessor directive, if $in_directive > 0
my $in_macro_header; # number of open parentheses + 1 in (multi-line) header of #define, if $in_directive > 0
my $in_comment; # number of lines so far within multi-line comment, or < 0 when end is on current line
my $leading_comment; # multi-line comment has no code before its beginning delimiter
my $formatted_comment; # multi-line comment beginning with "/*-", which indicates/allows special formatting
my $comment_indent; # comment indent, if $in_comment != 0
my $num_reports_line = 0; # number of issues found on current line
my $num_reports = 0; # total number of issues found
my $num_indent_reports = 0;# total number of indentation issues found
my $num_nesting_issues = 0;# total number of directive nesting issues found
my $num_syntax_issues = 0; # total number of syntax issues found during sanity checks
my $num_SPC_reports = 0; # total number of whitespace issues found
my $num_length_reports = 0;# total number of line length issues found
sub reset_file_state {
$line = 0;
$line_before = 0;
$line_before2 = 0;
@nested_block_indents = ();
@nested_hanging_offsets = ();
@nested_in_typedecl = ();
@nested_symbols = ();
@nested_indents = ();
@nested_conds_indents = ();
$expr_indent = 0;
$in_paren_expr = 0;
$in_expr = 0;
$hanging_offset = 0;
@in_do_hanging_offsets = ();
@in_if_hanging_offsets = ();
$if_maybe_terminated = 0;
$block_indent = 0;
$ifdef__cplusplus = 0;
$in_multiline_string = 0;
$line_body_start = 0;
$line_opening_brace = 0;
$in_typedecl = 0;
$in_directive = 0;
$directive_nesting = 0;
$in_comment = 0;
}
# auxiliary submodules @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub report_flexibly {
my $line = shift;
my $msg = shift;
my $contents = shift;
my $report_SPC = $msg =~ /SPC/;
return if $report_SPC && $sloppy_SPC;
print "$ARGV:$line:$msg:$contents" unless $self_test;
$num_reports_line++;
$num_reports++;
$num_indent_reports++ if $msg =~ m/indent/;
$num_nesting_issues++ if $msg =~ m/directive nesting/;
$num_syntax_issues++ if $msg =~ m/unclosed|unexpected/;
$num_SPC_reports++ if $report_SPC;
$num_length_reports++ if $msg =~ m/length/;
}
sub report {
my $msg = shift;
report_flexibly($line, $msg, $contents);
}
sub parens_balance { # count balance of opening parentheses - closing parentheses
my $str = shift;
return $str =~ tr/\(// - $str =~ tr/\)//;
}
sub blind_nonspace { # blind non-space text of comment as @, preserving length and spaces
# the @ character is used because it cannot occur in normal program code so there is no confusion
# comment text is not blinded to whitespace in order to be able to check double SPC also in comments
my $comment_text = shift;
$comment_text =~ s/\.\s\s/.. /g; # in double SPC checks allow one extra space after period '.' in comments
return $comment_text =~ tr/ /@/cr;
}
# submodule for indentation checking/reporting @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
sub check_indent { # used for lines outside multi-line string literals
my $stmt_indent = $block_indent + $hanging_offset + $local_offset;
$stmt_indent = 0 if $stmt_indent < 0; # TODO maybe give warning/error
my $stmt_desc = $contents =~
m/^\s*\/\*/ ? "intra-line comment" :
$has_label ? "label" :
($hanging_offset != 0 ? "hanging " : "").
($hanging_offset != 0 ? "stmt/expr" : "stmt/decl"); # $in_typedecl is not fully to the point here
my ($ref_desc, $ref_indent) = $expr_indent == 0 ? ($stmt_desc, $stmt_indent)
: ("hanging '$hanging_symbol'", $expr_indent);
my ($alt_desc, $alt_indent) = ("", $ref_indent);
# allow indent 1 for labels - this cannot happen for leading ':'
($alt_desc, $alt_indent) = ("outermost position", 1) if $expr_indent == 0 && $has_label;
if (@nested_conds_indents != 0 && substr($_, $count, 1) eq ":") {
# leading ':' within stmt/expr/decl - this cannot happen for labels, leading '&&', or leading '||'
# allow special indent at level of corresponding "?"
($alt_desc, $alt_indent) = ("leading ':'", @nested_conds_indents[-1]);
}
# allow extra indent offset leading '&&' or '||' - this cannot happen for leading ":"
($alt_desc, $alt_indent) = ("leading '$1'", $ref_indent + INDENT_LEVEL) if $contents =~ m/^[\s@]*(\&\&|\|\|)/;
if ($expr_indent < 0) { # implies @nested_symbols != 0 && @nested_symbols[0] eq "{" && @nested_indents[-1] < 0
# allow normal stmt indentation level for hanging initializer/enum expressions after trailing '{'
# this cannot happen for labels and overrides special treatment of ':', '&&' and '||' for this line
($alt_desc, $alt_indent) = ("lines after '{'", $stmt_indent);
# decide depending on current actual indentation, preventing forth and back
@nested_indents[-1] = $count == $stmt_indent ? $stmt_indent : -@nested_indents[-1]; # allow $stmt_indent
$ref_indent = $expr_indent = @nested_indents[-1];
}
# check consistency of indentation within multi-line comment (i.e., between its first, inner, and last lines)
if ($in_comment != 0 && $in_comment != 1) { # in multi-line comment but not on its first line
if (!$sloppy_cmt) {
if ($in_comment > 0) { # not at its end
report("indent = $count != $comment_indent within multi-line comment")
if $count != $comment_indent;
} else {
my $tweak = $in_comment == -2 ? 1 : 0;
report("indent = ".($count + $tweak)." != $comment_indent at end of multi-line comment")
if $count + $tweak != $comment_indent;
}
}
# do not check indentation of last line of non-leading multi-line comment
if ($in_comment < 0 && !$leading_comment) {
s/^(\s*)@/$1*/; # blind first '@' as '*' to prevent below delayed check for the line before
return;
}
return if $in_comment > 0; # not on its last line
# $comment_indent will be checked by the below checks for end of multi-line comment
}
# else check indentation of entire-line comment or entire-line end of multi-line comment
# ... w.r.t. indent of the following line by delayed check for the line before
if (($in_comment == 0 || $in_comment == 1) # no comment, intra-line comment, or begin of multi-line comment
&& $line_before > 0 # there is a line before
&& $contents_before_ =~ m/^(\s*)@[\s@]*$/) { # line before begins with '@', no code follows (except '\')
report_flexibly($line_before, "entire-line comment indent = $count_before != $count (of following line)",
$contents_before) if !$sloppy_cmt && $count_before != $count;
}
# ... but allow normal indentation for the current line, else above check will be done for the line before
if (($in_comment == 0 || $in_comment < 0) # (no commment,) intra-line comment or end of multi-line comment
&& m/^(\s*)@[\s@]*$/) { # line begins with '@', no code follows (except '\')
if ($count == $ref_indent) { # indentation is like for (normal) code in this line
s/^(\s*)@/$1*/; # blind first '@' as '*' to prevent above delayed check for the line before
return;
}
return if !eof; # defer check of entire-line comment to next line
}
# else check indentation of leading intra-line comment or end of multi-line comment
if (m/^(\s*)@/) { # line begins with '@', i.e., any (remaining type of) comment
if (!$sloppy_cmt && $count != $ref_indent) {
report("intra-line comment indent = $count != $ref_indent") if $in_comment == 0;
report("multi-line comment indent = $count != $ref_indent") if $in_comment < 0;
}
return;
}
if ($sloppy_hang && ($hanging_offset != 0 || $expr_indent != 0)) {
# do not report same indentation as on the line before (potentially due to same violations)
return if $line_before > 0 && $count == $count_before;
# do not report indentation at normal indentation level while hanging expression indent would be required
return if $expr_indent != 0 && $count == $stmt_indent;
# do not report if contents have been shifted left of nested expr indent (but not as far as stmt indent)
# apparently aligned to the right in order to fit within line length limit
return if $stmt_indent < $count && $count < $expr_indent &&
length($contents) == MAX_LINE_LENGTH + length("\n");
}
report("indent = $count != $ref_indent for $ref_desc".
($alt_desc eq ""
|| $alt_indent == $ref_indent # prevent showing alternative that happens to have equal value
? "" : " or $alt_indent for $alt_desc"))
if $count != $ref_indent && $count != $alt_indent;
}
# submodules handling indentation within expressions @@@@@@@@@@@@@@@@@@@@@@@@@@@
sub update_nested_indents { # may reset $in_paren_expr and in this case also resets $in_expr
my $str = shift;
my $start = shift; # defaults to 0
my $terminator_position = -1;
for (my $i = $start; $i < length($str); $i++) {
my $c;
my $curr = substr($str, $i);
if ($curr =~ m/^(.*?)([{}()?:;\[\]])(.*)$/) { # match from position $i the first {}()?:;[]
$c = $2;
} else {
last;
}
my ($head, $tail) = (substr($str, 0, $i).$1, $3);
$i += length($1) + length($2) - 1;
# stop at terminator outside 'for(..;..;..)', assuming that 'for' is followed by '('
return $i if $c eq ";" && (!$in_paren_expr || @nested_indents == 0);
my $in_stmt = $in_expr || @nested_symbols != 0; # not: || $in_typedecl != 0
if ($c =~ m/[{([?]/) { # $c is '{', '(', '[', or '?'
if ($c eq "{") { # '{' in any context
# cancel newly hanging_offset if opening brace '{' is after non-whitespace non-comment:
$hanging_offset -= INDENT_LEVEL if $hanging_offset > 0 && $head =~ m/[^\s\@]/;
push @nested_block_indents, $block_indent;
push @nested_hanging_offsets, $in_expr ? $hanging_offset : 0;
push @nested_in_typedecl, $in_typedecl if $in_typedecl != 0;
$block_indent += INDENT_LEVEL + $hanging_offset;
$hanging_offset = 0;
}
if ($c ne "{" || $in_stmt) { # for '{' inside stmt/expr (not: decl), for '(', '[', or '?' anywhere
$tail =~ m/^([\s@]*)([^\s\@])/;
push @nested_indents, defined $2
? $i + 1 + length($1) # actual indentation of following non-space non-comment
: $c ne "{" ? +($i + 1) # just after '(' or '[' if only whitespace thereafter
: -($i + 1); # allow also $stmt_indent if '{' with only whitespace thereafter
push @nested_symbols, $c; # done also for '?' to be able to check correct nesting
push @nested_conds_indents, $i if $c eq "?"; # remember special alternative indent for ':'
}
} elsif ($c =~ m/[})\]:]/) { # $c is '}', ')', ']', or ':'
my $opening_c = ($c =~ tr/})]:/{([/r);
if (($c ne ":" || $in_stmt # ignore ':' outside stmt/expr/decl
# in the presence of ':', one could add this sanity check:
# && !(# ':' after initial label/case/default
# $head =~ m/^([\s@]*)(case\W.*$|\w+$)/ || # this matching would not work for
# # multi-line expr after 'case'
# # bitfield length within unsigned type decl
# $tail =~ m/^[\s@]*\d+/ # this matching would need improvement
# )
)) {
if ($c ne "}" || $in_stmt) { # for '}' inside stmt/expr/decl, ')', ']', or ':'
if (@nested_symbols != 0 &&
@nested_symbols[-1] == $opening_c) { # for $c there was a corresponding $opening_c
pop @nested_indents;
pop @nested_symbols;
pop @nested_conds_indents if $opening_c eq "?";
} else {
report("unexpected '$c' @ ".($in_paren_expr ? "(expr)" : "expr"));
next;
}
}
if ($c eq "}") { # '}' at block level but also inside stmt/expr/decl
if (@nested_block_indents == 0) {
report("unexpected '}'");
} else {
$block_indent = pop @nested_block_indents;
$hanging_offset = pop @nested_hanging_offsets;
$in_typedecl = pop @nested_in_typedecl if @nested_in_typedecl != 0;
}
}
if ($in_paren_expr && !grep(/\(/, @nested_symbols)) { # end of (expr)
check_nested_nonblock_indents("(expr)");
$in_paren_expr = $in_expr = 0;
report("code after (expr)")
if $tail =~ m/^([^{]*)/ && $1 =~ m/[^\s\@;]/; # non-space non-';' before any '{'
}
}
}
}
return -1;
}
sub check_nested_nonblock_indents {
my $position = shift;
while (@nested_symbols != 0) {
my $symbol = pop @nested_symbols;
report("unclosed '$symbol' in $position");
if ($symbol eq "{") { # repair stack of blocks
$block_indent = pop @nested_block_indents;
$hanging_offset = pop @nested_hanging_offsets;
$in_typedecl = pop @nested_in_typedecl if @nested_in_typedecl != 0;
}
}
@nested_indents = ();
@nested_conds_indents = ();
}
# start of main program @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
reset_file_state();
while (<>) { # loop over all lines of all input files
$self_test = $ARGV =~ m/check-format-test/;
$line++;
s/\r$//; # strip any trailing CR '\r' (which are typical on Windows systems)
$contents = $_;
# check for illegal characters
if (m/(.*?)([\x00-\x09\x0B-\x1F\x7F-\xFF])/) {
my $col = length($1);
report(($2 eq "\x09" ? "TAB" : $2 eq "\x0D" ? "CR " : $2 =~ m/[\x00-\x1F]/ ? "non-printable"
: "non-7bit char") . " at column $col") ;
}
# check for whitespace at EOL
report("trailing whitespace at EOL") if m/\s\n$/;
# assign to $count the actual indentation level of the current line
chomp; # remove trailing NL '\n'
m/^(\s*)/;
$count = length($1); # actual indentation
$has_label = 0;
$local_offset = 0;
# character/string literals @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
s/\\["']/@@/g; # blind all '"' and "'" escaped by '\' (typically within character literals or string literals)
# handle multi-line string literals to avoid confusion on starting/ending '"' and trailing '\'
if ($in_multiline_string) {
if (s#^([^"]*)"#($1 =~ tr/"/@/cr).'@'#e) { # string literal terminated by '"'
# string contents and its terminating '"' have been blinded as '@'
$count = -1; # do not check indentation
} else {
report("multi-line string literal not terminated by '\"' and trailing '\' is missing")
unless s#^([^\\]*)\s*\\\s*$#$1#; # strip trailing '\' plus any whitespace around
goto LINE_FINISHED;
}
}
# blind contents of character and string literals as @, preserving length (but not spaces)
# this prevents confusing any of the matching below, e.g., of whitespace and comment delimiters
s#('[^']*')#$1 =~ tr/'/@/cr#eg; # handle all intra-line character literals
s#("[^"]*")#$1 =~ tr/"/@/cr#eg; # handle all intra-line string literals
$in_multiline_string = # handle trailing string literal terminated by '\'
s#^(([^"]*"[^"]*")*[^"]*)("[^"]*)\\(\s*)$#$1.($3 =~ tr/"/@/cr).'"'.$4#e;
# its contents have been blinded and the trailing '\' replaced by '"'
# strip any other trailing '\' along with any whitespace around it such that it does not interfere with various
# matching below; the later handling of multi-line macro definitions uses $contents where it is not stripped
s#^(.*?)\s*\\\s*$#$1#; # trailing '\' possibly preceded and/or followed by whitespace
# comments @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
# do/prepare checks within multi-line comments
my $self_test_exception = $self_test ? "@" : "";
if ($in_comment > 0) { # this still includes the last line of multi-line commment
my ($head, $any_symbol, $cmt_text) = m/^(\s*)(.?)(.*)$/;
if ($any_symbol eq "*") {
report("no SPC after leading '*' in multi-line comment") if $cmt_text =~ m|^[^/\s$self_test_exception]|;
} else {
report("no leading '*' in multi-line comment");
}
$in_comment++;
}
# detect end of comment, must be within multi-line comment, check if it is preceded by non-whitespace text
if ((my ($head, $tail) = m|^(.*?)\*/(.*)$|) && $1 ne '/') { # ending comment: '*/'
report("neither SPC nor '*' before '*/'") if $head =~ m/[^*\s]$/;
report("no SPC after '*/'") if $tail =~ m/^[^\s,;)}\]]/; # no space or ,;)}] after '*/'
if (!($head =~ m|/\*|)) { # not begin of comment '/*', which is is handled below
if ($in_comment == 0) {
report("unexpected '*/' outside comment");
$_ = "$head@@".$tail; # blind the "*/"
} else {
report("text before '*/' in multi-line comment") if ($head =~ m/\S/); # non-SPC before '*/'
$in_comment = -1; # indicate that multi-line comment ends on current line
if ($count > 0) {
# make indentation of end of multi-line comment appear like of leading intra-line comment
$head =~ s/^(\s*)\s/$1@/; # replace the last leading space by '@'
$count--;
$in_comment = -2; # indicate that multi-line comment ends on current line, with tweak
}
my $cmt_text = $head;
$_ = blind_nonspace($cmt_text)."@@".$tail;
}
}
}
# detect begin of comment, check if it is followed by non-space text
MATCH_COMMENT:
if (my ($head, $opt_minus, $tail) = m|^(.*?)/\*(-?)(.*)$|) { # begin of comment: '/*'
report("no SPC before '/*'")
if $head =~ m/[^\s(\*]$/; # not space, '(', or or '*' (needed to allow '*/') before comment delimiter
report("neither SPC nor '*' after '/*' or '/*-'") if $tail =~ m/^[^\s*$self_test_exception]/;
my $cmt_text = $opt_minus.$tail; # preliminary
if ($in_comment > 0) {
report("unexpected '/*' inside multi-line comment");
} elsif ($tail =~ m|^(.*?)\*/(.*)$|) { # comment end: */ on same line
report("unexpected '/*' inside intra-line comment") if $1 =~ /\/\*/;
# blind comment text, preserving length and spaces
($cmt_text, my $rest) = ($opt_minus.$1, $2);
$_ = "$head@@".blind_nonspace($cmt_text)."@@".$rest;
goto MATCH_COMMENT;
} else { # begin of multi-line comment
my $self_test_exception = $self_test ? "(@\d?)?" : "";
report("text after '/*' in multi-line comment")
unless $tail =~ m/^$self_test_exception.?\s*$/;
# tail not essentially empty, first char already checked
# adapt to actual indentation of first line
$comment_indent = length($head) + 1;
$_ = "$head@@".blind_nonspace($cmt_text);
$in_comment = 1;
$leading_comment = $head =~ m/^\s*$/; # there is code before beginning delimiter
$formatted_comment = $opt_minus eq "-";
}
}
if ($in_comment > 1) { # still inside multi-line comment (not at its begin or end)
m/^(\s*)\*?(\s*)(.*)$/;
$_ = $1."@".$2.blind_nonspace($3);
}
# handle special case of line after '#ifdef __cplusplus' (which typically appears in header files)
if ($ifdef__cplusplus) {
$ifdef__cplusplus = 0;
$_ = "$1 $2" if $contents =~ m/^(\s*extern\s*"C"\s*)\{(\s*)$/; # ignore opening brace in 'extern "C" {'
goto LINE_FINISHED if m/^\s*\}\s*$/; # ignore closing brace '}'
}
# check for over-long lines,
# while allowing trailing (also multi-line) string literals to go past $max_length
my $len = length; # total line length (without trailing '\n')
if ($len > $max_length &&
!(m/^(.*)"[^"]*"\s*[\)\}\]]*[,;]?\s*$/ # string literal terminated by '"' (or '\'), then maybe )}],;
&& length($1) < $max_length)
# this allows over-long trailing string literals with beginning col before $max_length
) {
report("line length = $len > ".MAX_LINE_LENGTH);
}
# handle C++ / C99 - style end-of-line comments
if (my ($head, $cmt_text) = m|^(.*?)//(.*$)|) {
report("'//' end-of-line comment"); # the '//' comment style is not allowed for C90
# blind comment text, preserving length and spaces
$_ = "$head@@".blind_nonspace($cmt_text);
}
# at this point all non-space portions of any types of comments have been blinded as @
goto LINE_FINISHED if m/^\s*$/; # essentially empty line: just whitespace (and maybe a trailing '\')
# intra-line whitespace nits @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
my $in_multiline_comment = ($in_comment > 1 || $in_comment < 0); # $in_multiline_comment refers to line before
if (!$sloppy_SPC && !($in_multiline_comment && $formatted_comment)) {
sub dbl_SPC {
my $intra_line = shift;
return "double SPC".($intra_line =~ m/@\s\s/ ?
$in_comment != 0 ? " in multi-line comment"
: " in intra-line comment" : "");
}
sub split_line_head {
my $comment_symbol =
$in_comment != 0 ? "@" : ""; # '@' will match the blinded leading '*' in multi-line comment
# $in_comment may pertain to the following line due to delayed check
# do not check for double SPC in leading spaces including any '#' (or '*' within multi-line comment)
shift =~ m/^(\s*([#$comment_symbol]\s*)?)(.*?)\s*$/;
return ($1, $3);
}
my ($head , $intra_line ) = split_line_head($_);
my ($head1, $intra_line1) = split_line_head($contents_before_ ) if $line_before > 0;
my ($head2, $intra_line2) = split_line_head($contents_before_2) if $line_before2 > 0;
if ($line_before > 0) { # check with one line delay, such that at least $contents_before is available
sub column_alignments_only {
my $head = shift;
my $intra = shift;
my $contents = shift;
# check if all double SPC in $intra is used only for multi-line column alignment with $contents
my $offset = length($head);
for (my $col = 0; $col < length($intra) - 2; $col++) {
return 0 if substr($intra , $col, 3) =~ m/\s\s\S/ # double space (after leading space)
&& !(substr($contents, $col + $offset + 1, 2) =~ m/\s\S/)
}
return 1;
}
report_flexibly($line_before, dbl_SPC($intra_line1), $contents_before) if $intra_line1 =~ m/\s\s\S/ &&
!( column_alignments_only($head1, $intra_line1, $_ ) # compare with $line
|| ($line_before2 > 0 &&
column_alignments_only($head1, $intra_line1, $contents_before_2))); # compare w/ $line_before2
report(dbl_SPC($intra_line)) if $intra_line =~ m/\s\s\S/ && eof
&& ! column_alignments_only($head , $intra_line , $contents_before_ ) ; # compare w/ $line_before
} elsif (eof) { # special case: just one line exists
report(dbl_SPC($intra_line)) if $intra_line =~ m/\s\s\S/;
}
# ignore paths in #include
$intra_line =~ s/^(include\s*)(".*?"|<.*?>)/$1/e if $head =~ m/#/;
# treat op= and comparison operators as simple '=', simplifying matching below
$intra_line =~ s/([\+\-\*\/\/%\&\|\^\!<>=]|<<|>>)=/=/g;
# treat (type) variables within macro, indicated by trailing '\', as 'int' simplifying matching below
$intra_line =~ s/[A-Z_]+/int/g if $contents =~ m/^(.*?)\s*\\\s*$/;
# treat double &&, ||, <<, and >> as single ones, simplifying matching below
$intra_line =~ s/(&&|\|\||<<|>>)/substr($1, 0, 1)/eg;
# remove blinded comments etc. directly after [{(
while ($intra_line =~ s/([\[\{\(])@+\s?/$1/e) {} # /g does not work here
# remove blinded comments etc. directly before ,;)}]
while ($intra_line =~ s/\s?@+([,;\)\}\]])/$1/e) {} # /g does not work here
# treat remaining blinded comments and string literal contents as (single) space during matching below
$intra_line =~ s/@+/ /g; # note that double SPC has already been handled above
$intra_line =~ s/\s+$//; # strip any (resulting) space at EOL
$intra_line =~ s/(for\s*\();;(\))/"$1$2"/eg; # strip ';;' in for (;;)
$intra_line =~ s/(=\s*)\{ /"$1@ "/eg; # do not report {SPC in initializers such as ' = { 0, };'
$intra_line =~ s/, \};/, @;/g; # do not report SPC} in initializers such as ' = { 0, };'
report("SPC before '$1'") if $intra_line =~ m/[\w)\]]\s+(\+\+|--)/; # postfix ++/-- with preceding space
report("SPC after '$1'") if $intra_line =~ m/(\+\+|--)\s+[a-zA-Z_(]/; # prefix ++/-- with following space
$intra_line =~ s/\.\.\./@/g; # blind '...'
report("SPC before '$1'") if $intra_line =~ m/\s(\.|->)/; # '.' or '->' with preceding space
report("SPC after '$1'") if $intra_line =~ m/(\.|->)\s/; # '.' or '->' with following space
$intra_line =~ s/\-\>|\+\+|\-\-/@/g; # blind '->,', '++', and '--'
report("SPC before '$2'") if $intra_line =~ m/[^:]\s+(;)/; # space before ';' but not after ':'
report("SPC before '$1'") if $intra_line =~ m/\s([,)\]])/; # space before ,)]
report("SPC after '$1'") if $intra_line =~ m/([(\[~!])\s/; # space after ([~!
report("SPC after '$1'") if $intra_line =~ m/(defined)\s/; # space after 'defined'
report("no SPC before '=' or '<op>='") if $intra_line =~ m/\S(=)/; # '=' etc. without preceding space
report("no SPC before '$1'") if $intra_line =~ m/\S([|\/%<>^\?])/; # |/%<>^? without preceding space
# TODO ternary ':' without preceding SPC, while allowing no SPC before ':' after 'case'
report("no SPC before '$1'") if $intra_line =~ m/[^\s{()\[]([+\-])/;# +/- without preceding space or {()[
# or ')' (which is used f type casts)
report("no SPC before '$1'") if $intra_line =~ m/[^\s{()\[*]([*])/; # '*' without preceding space or {()[*
report("no SPC before '$1'") if $intra_line =~ m/[^\s{()\[]([&])/; # '&' without preceding space or {()[
report("no SPC after ternary '$1'") if $intra_line =~ m/(:)[^\s\d]/; # ':' without following space or digit
report("no SPC after '$1'") if $intra_line =~ m/([,;=|\/%<>^\?])\S/; # ,;=|/%<>^? without following space
report("no SPC after binary '$1'") if $intra_line=~m/([*])[^\sa-zA-Z_(),*]/;# '*' w/o space or \w(),* after
# TODO unary '*' must not be followed by SPC
report("no SPC after binary '$1'") if $intra_line=~m/([&])[^\sa-zA-Z_(]/; # '&' w/o following space or \w(
# TODO unary '&' must not be followed by SPC
report("no SPC after binary '$1'") if $intra_line=~m/([+\-])[^\s\d(]/; # +/- w/o following space or \d(
# TODO unary '+' and '-' must not be followed by SPC
report("no SPC after '$2'") if $intra_line =~ m/(^|\W)(if|while|for|switch|case)[^\w\s]/; # kw w/o SPC
report("no SPC after '$2'") if $intra_line =~ m/(^|\W)(return)[^\w\s;]/; # return w/o SPC or ';'
report("SPC after function/macro name")
if $intra_line =~ m/(\w+)\s+\(/ # fn/macro name with space before '('
&& !($1 =~ m/^(if|while|for|switch|return|typedef|void|char|unsigned|int|long|float|double)$/) # not keyword
&& !(m/^\s*#\s*define\s/); # we skip macro definitions here because macros
# without parameters but with body beginning with '(', e.g., '#define X (1)',
# would lead to false positives - TODO also check for macros with parameters
report("no SPC before '{'") if $intra_line =~ m/[^\s{(\[]\{/; # '{' without preceding space or {([
report("no SPC after '}'") if $intra_line =~ m/\}[^\s,;\])}]/; # '}' without following space or ,;])}
}
# preprocessor directives @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
# handle preprocessor directives
if (m/^\s*#(\s*)(\w+)/) { # line beginning with '#'
my $space_count = length($1); # maybe could also use indentation before '#'
my $directive = $2;
report("indent = $count != 0 for '#'") if $count != 0;
$directive_nesting-- if $directive =~ m/^(else|elif|endif)$/;
if ($directive_nesting < 0) {
$directive_nesting = 0;
report("unexpected '#$directive'");
}
report("'#' directive nesting = $space_count != $directive_nesting") if $space_count != $directive_nesting;
$directive_nesting++ if $directive =~ m/^if|ifdef|ifndef|else|elif$/;
$ifdef__cplusplus = m/^\s*#\s*ifdef\s+__cplusplus\s*$/;
goto POSTPROCESS_DIRECTIVE unless $directive =~ m/^define$/; # skip normal code handling except for #define
# TODO improve handling of indents of preprocessor directives ('\', $in_directive != 0) vs. normal C code
$count = -1; # do not check indentation of #define
}
# adapt required indentation @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
s/(\w*ASN1_[A-Z_]+END\w*([^(]|\(.*?\)|$))/$1;/g; # treat *ASN1_*END*(..) macro calls as if followed by ';'
my $nested_indents_position = 0;
# update indents according to leading closing brace(s) '}' or label or switch case
my $in_stmt = $in_expr || @nested_symbols != 0 || $in_typedecl != 0;
if ($in_stmt) { # expr/stmt/type decl/var def/fn hdr, i.e., not at block level
if (m/^([\s@]*\})/) { # leading '}', any preceding blinded comment must not be matched
my $head = $1;
update_nested_indents($head);
$nested_indents_position = length($head);
if (@nested_symbols >= 1) {
$hanging_symbol = @nested_symbols[-1];
$expr_indent = @nested_indents[-1];
} else { # typically end of initialiizer expr or enum
$expr_indent = 0;
}
} elsif (m/^([\s@]*)(static_)?ASN1_ITEM_TEMPLATE_END(\W|$)/) { # workaround for ASN1 macro indented as '}'
$local_offset = -INDENT_LEVEL;
$expr_indent = 0;
} elsif (m/;.*?\}/) { # expr ends with ';' before '}'
report("code before '}'");
}
}
if (@in_do_hanging_offsets != 0 && # note there is nothing like "unexpected 'while'"
m/^[\s@]*while(\W|$)/) { # leading 'while'
$hanging_offset = pop @in_do_hanging_offsets;
}
if ($if_maybe_terminated) {
if (m/(^|\W)else(\W|$)/) { # (not necessarily leading) 'else'
if (@in_if_hanging_offsets == 0) {
report("unexpected 'else'");
} else {
$hanging_offset = pop @in_if_hanging_offsets;
}
} else {
@in_if_hanging_offsets = (); # note there is nothing like "unclosed 'if'"
$hanging_offset = 0;
}
}
if (!$in_stmt) { # at block level, i.e., outside expr/stmt/type decl/var def/fn hdr
$if_maybe_terminated = 0;
if (my ($head, $before, $tail) = m/^([\s@]*([^{}]*)\})[\s@]*(.*)$/) { # leading closing '}', but possibly
# with non-whitespace non-'{' before
report("code after '}'") unless $tail eq "" || $tail =~ m/(else|while|OSSL_TRACE_END)(\W|$)/;
my $outermost_level = @nested_block_indents == 1 && @nested_block_indents[0] == 0;
if (!$sloppy_bodylen && $outermost_level && $line_body_start != 0) {
my $body_len = $line - $line_body_start - 1;
report_flexibly($line_function_start, "function body length = $body_len > ".MAX_BODY_LENGTH." lines",
$last_function_header) if $body_len > MAX_BODY_LENGTH;
$line_body_start = 0;
}
if ($before ne "") { # non-whitespace non-'{' before '}'
report("code before '}'");
} else { # leading '}', any preceding blinded comment must not be matched
$local_offset = $block_indent + $hanging_offset - INDENT_LEVEL;
update_nested_indents($head);
$nested_indents_position = length($head);
$local_offset -= ($block_indent + $hanging_offset);
# in effect $local_offset = -INDENT_LEVEL relative to $block_indent + $hanging_offset values before
}
}
# handle opening brace '{' after if/else/while/for/switch/do on line before
if ($hanging_offset > 0 && m/^[\s@]*{/ && # leading opening '{'
$line_before > 0 &&
$contents_before_ =~ m/(^|^.*\W)(if|else|while|for|switch|do)(\W.*$|$)/) {
$keyword_opening_brace = $1;
$hanging_offset -= INDENT_LEVEL; # cancel newly hanging_offset
}
if (m/^[\s@]*(case|default)(\W.*$|$)/) { # leading 'case' or 'default'
my $keyword = $1;
report("code after $keyword: ") if $2 =~ /:.*[^\s@].*$/;
$local_offset = -INDENT_LEVEL;
} else {
if (m/^([\s@]*)(\w+):/) { # (leading) label, cannot be "default"
$local_offset = -INDENT_LEVEL + 1 ;
$has_label = 1;
}
}
}
# potential adaptations of indent in first line of macro body in multi-line macro definition
if ($in_directive > 0 && $in_macro_header > 0) {
if ($in_macro_header > 1) { # still in macro definition header
$in_macro_header += parens_balance($_);
} else { # begin of macro body
$in_macro_header = 0;
if ($count == $block_indent - $directive_offset # body began with same indentation as preceding code
&& $sloppy_macro) { # workaround for this situation is enabled
$block_indent -= $directive_offset;
$directive_offset = 0;
}
}
}
# check required indentation @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
check_indent() if $count >= 0; # not for #define and not if multi-line string literal is continued
$in_comment = 0 if $in_comment < 0; # multi-line comment has ended
# do some further checks @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
my $outermost_level = $block_indent == 0 + ($in_directive > 0 ? $directive_offset : 0);
report("more than one stmt") if !m/(^|\W)for(\W.*|$)/ && # no 'for' - TODO improve matching
m/;.*;/; # two or more terminators ';', so more than one statement
# check for code block containing a single line/statement
if ($line_before2 > 0 && !$outermost_level && # within function body
$in_typedecl == 0 && @nested_indents == 0 && # neither within type declaration nor inside stmt/expr
m/^[\s@]*\}/) { # leading closing brace '}', any preceding blinded comment must not be matched
# TODO extend detection from single-line to potentially multi-line statement
if ($line_opening_brace > 0 &&
($line_opening_brace == $line_before2 ||
$line_opening_brace == $line_before)
&& $contents_before =~ m/;/) { # there is at least one terminator ';', so there is some stmt
# TODO do not report cases where a further else branch
# follows with a block containg more than one line/statement
report_flexibly($line_before, "'$keyword_opening_brace' { 1 stmt }", $contents_before);
}
}
report("one-letter name '$2'") if (m/(^|.*\W)([lIO])(\W.*|$)/); # single-letter name 'l', 'I', or 'O'
# TODO report empty line within local variable definitions
# TODO report missing empty line after local variable definitions
# TODO report needless use of parentheses, while
# macro parameters should always be in parens (except when passed on), e.g., '#define ID(x) (x)'
# adapt required indentation for following lines @@@@@@@@@@@@@@@@@@@@@@@@@@@
# set $in_expr, $in_paren_expr, and $hanging_offset for if/while/for/switch, return/enum, and assignment RHS
my $paren_expr_start = 0;
my $return_enum_start = 0;
my $assignment_start = 0;
my $tmp = $_;
$tmp =~ s/[\!<>=]=/@@/g; # blind (in-)equality symbols like '<=' as '@@' to prevent matching them as '=' below
if (m/^((^|.*\W)(if|while|for|switch))(\W.*|$)$/) { # (last) if/for/while/switch
$paren_expr_start = 1;
} elsif (m/^((^|.*\W)(return|enum))(\W.*|$)/ # (last) return/enum
&& !$in_expr && @nested_indents == 0 && parens_balance($1) == 0) { # not nested enum
$return_enum_start = 1;
} elsif ($tmp =~ m/^(([^=]*)(=))(.*)$/ # (last) '=', i.e., assignment
&& !$in_expr && @nested_indents == 0 && parens_balance($1) == 0) { # not nested assignment
$assignment_start = 1;
}
if ($paren_expr_start || $return_enum_start || $assignment_start)
{
my ($head, $mid, $tail) = ($1, $3, $4);
$keyword_opening_brace = $mid if $mid ne "=";
# to cope with multi-line expressions, do this also if !($tail =~ m/\{/)
push @in_if_hanging_offsets, $hanging_offset if $mid eq "if";
# already handle $head, i.e., anything before expression
update_nested_indents($head, $nested_indents_position);
$nested_indents_position = length($head);
# now can set $in_expr and $in_paren_expr
$in_expr = 1;
$in_paren_expr = 1 if $paren_expr_start;
if ($mid eq "while" && @in_do_hanging_offsets != 0) {
$hanging_offset = pop @in_do_hanging_offsets;
} else {
$hanging_offset += INDENT_LEVEL; # tentatively set hanging_offset, may be canceled by following '{'
}
}
# set $hanging_offset and $keyword_opening_brace for do/else
if (my ($head, $mid, $tail) = m/(^|^.*\W)(else|do)(\W.*|$)$/) { # last else/do, where 'do' is preferred
my $code_before = $head =~ m/[^\s\@}]/; # leading non-whitespace non-comment non-'}'
report("code before '$mid'") if $code_before;
report("code after '$mid'" ) if $tail =~ m/[^\s\@{]/# trailing non-whitespace non-comment non-'{' (non-'\')
&& !($mid eq "else" && $tail =~ m/[\s@]*if(\W|$)/);
if ($mid eq "do") { # workarounds for code before 'do'
if ($head =~ m/(^|^.*\W)(else)(\W.*$|$)/) { # 'else' ... 'do'
$hanging_offset += INDENT_LEVEL; # tentatively set hanging_offset, may be canceled by following '{'
}
if ($head =~ m/;/) { # terminator ';' ... 'do'
@in_if_hanging_offsets = (); # note there is nothing like "unclosed 'if'"
$hanging_offset = 0;
}
}
push @in_do_hanging_offsets, $hanging_offset if $mid eq "do";
if ($code_before && $mid eq "do") {
$hanging_offset = length($head) - $block_indent;
}
if (!$in_paren_expr) {
$keyword_opening_brace = $mid if $tail =~ m/\{/;
$hanging_offset += INDENT_LEVEL;
}
}
# set $in_typedecl and potentially $hanging_offset for type declaration
if (!$in_expr && @nested_indents == 0 && # not in expression
m/(^|^.*\W)(typedef|struct|union|enum)(\W.*|$)$/ &&
parens_balance($1) == 0) { # not in newly started expression
# not needed: $keyword_opening_brace = $2 if $3 =~ m/\{/;
$in_typedecl++;
$hanging_offset += INDENT_LEVEL if m/\*.*\(/; # '*' followed by '(' - seems consistent with Emacs C mode
}
my $bak_in_expr = $in_expr;
my $terminator_position = update_nested_indents($_, $nested_indents_position);
if ($bak_in_expr) {
# on end of non-if/while/for/switch (multi-line) expression (i.e., return/enum/assignment) and
# on end of statement/type declaration/variable definition/function header
if ($terminator_position >= 0 && ($in_typedecl == 0 || @nested_indents == 0)) {
check_nested_nonblock_indents("expr");
$in_expr = 0;
}
} else {
check_nested_nonblock_indents($in_typedecl == 0 ? "stmt" : "decl") if $terminator_position >= 0;
}
# on ';', which terminates the current statement/type declaration/variable definition/function declaration
if ($terminator_position >= 0) {
my $tail = substr($_, $terminator_position + 1);
if (@in_if_hanging_offsets != 0) {
if ($tail =~ m/\s*else(\W|$)/) {
pop @in_if_hanging_offsets;
$hanging_offset -= INDENT_LEVEL;
} elsif ($tail =~ m/[^\s@]/) { # code (not just comment) follows
@in_if_hanging_offsets = (); # note there is nothing like "unclosed 'if'"
$hanging_offset = 0;
} else {
$if_maybe_terminated = 1;
}
} elsif ($tail =~ m/^[\s@]*$/) { # ';' has been trailing, i.e. there is nothing but whitespace and comments
$hanging_offset = 0; # reset in case of terminated assignment ('=') etc.
}
$in_typedecl-- if $in_typedecl != 0 && @nested_in_typedecl == 0; # TODO handle multiple type decls per line
m/(;[^;]*)$/; # match last ';'
$terminator_position = length($_) - length($1) if $1;
# new $terminator_position value may be after the earlier one in case multiple terminators on current line
# TODO check treatment in case of multiple terminators on current line
update_nested_indents($_, $terminator_position + 1);
}
# set hanging expression indent according to nested indents - TODO maybe do better in update_nested_indents()
# also if $in_expr is 0: in statement/type declaration/variable definition/function header
$expr_indent = 0;
for (my $i = -1; $i >= -@nested_symbols; $i--) {
if (@nested_symbols[$i] ne "?") { # conditionals '?' ... ':' are treated specially in check_indent()
$hanging_symbol = @nested_symbols[$i];
$expr_indent = $nested_indents[$i];
# $expr_indent is guaranteed to be != 0 unless @nested_indents contains just outer conditionals
last;
}
}
# remember line number and header containing name of last function defined for reports w.r.t. MAX_BODY_LENGTH
if ($outermost_level && m/(\w+)\s*\(/ && $1 ne "STACK_OF") {
$line_function_start = $line;
$last_function_header = $contents;
}
# special checks for last, typically trailing opening brace '{' in line
if (my ($head, $tail) = m/^(.*)\{(.*)$/) { # match last ... '{'
if ($in_directive == 0 && !$in_expr && $in_typedecl == 0) {
if ($outermost_level) {
if (!$assignment_start && !$bak_in_expr) {
# at end of function definition header (or stmt or var definition)
report("'{' not at beginning") if $head ne "";
$line_body_start = $contents =~ m/LONG BODY/ ? 0 : $line;
}
} else {
$line_opening_brace = $line if $keyword_opening_brace =~ m/do|while|for/;
# using, not assigning, $keyword_opening_brace here because it could be on an earlier line
$line_opening_brace = $line if $keyword_opening_brace =~ m/if|else/ && $extended_1_stmt &&
# TODO prevent false positives for if/else where braces around single-statement branches
# should be avoided but only if all branches have just single statements
# The following helps detecting the exception when handling multiple 'if ... else' branches:
!($keyword_opening_brace eq "else" && $line_opening_brace < $line_before2);
}
report("code after '{'") if $tail=~ m/[^\s\@]/ && # trailing non-whitespace non-comment (non-'\')
!($tail=~ m/\}/); # no '}' after last '{'
}
}
# check for opening brace after if/while/for/switch/do not on same line
# note that "no '{' on same line after '} else'" is handled further below
if (/^[\s@]*{/ && # leading '{'
$line_before > 0 && !($contents_before_ =~ m/^\s*#/) && # not preprocessor directive '#if
(my ($head, $mid, $tail) = ($contents_before_ =~ m/(^|^.*\W)(if|while|for|switch|do)(\W.*$|$)/))) {
my $brace_after = $tail =~ /^[\s@]*{/; # any whitespace or comments then '{'
report("'{' not on same line as preceding '$mid'") if !$brace_after;
}
# check for closing brace on line before 'else' not followed by leading '{'
elsif (my ($head, $tail) = m/(^|^.*\W)else(\W.*$|$)/) {
if (parens_balance($tail) == 0 && # avoid false positive due to unfinished expr on current line
!($tail =~ m/{/) && # after 'else' no '{' on same line
!($head =~ m/}[\s@]*$/) && # not: '}' then any whitespace or comments before 'else'
$line_before > 0 && $contents_before_ =~ /}[\s@]*$/) { # trailing '}' on line before
report("no '{' after '} else'");
}
}
# check for closing brace before 'while' not on same line
if (my ($head, $tail) = m/(^|^.*\W)while(\W.*$|$)/) {
my $brace_before = $head =~ m/}[\s@]*$/; # '}' then any whitespace or comments
# possibly 'if (...)' (with potentially inner '(' and ')') then any whitespace or comments then '{'
if (!$brace_before &&
# does not work here: @in_do_hanging_offsets != 0 && #'while' terminates loop
parens_balance($tail) == 0 && # avoid false positive due to unfinished expr on current line
$tail =~ /;/ && # 'while' terminates loop (by ';')
$line_before > 0 &&
$contents_before_ =~ /}[\s@]*$/) { # on line before: '}' then any whitespace or comments
report("'while' not on same line as preceding '}'");
}
}
# check for missing brace on same line before or after 'else'
if (my ($head, $tail) = m/(^|^.*\W)else(\W.*$|$)/) {
my $brace_before = $head =~ /}[\s@]*$/; # '}' then any whitespace or comments
my $brace_after = $tail =~ /^[\s@]*if[\s@]*\(.*\)[\s@]*{|[\s@]*{/;
# possibly 'if (...)' (with potentially inner '(' and ')') then any whitespace or comments then '{'
if (!$brace_before) {
if ($line_before > 0 && $contents_before_ =~ /}[\s@]*$/) {
report("'else' not on same line as preceding '}'");
} elsif (parens_balance($tail) == 0) { # avoid false positive due to unfinished expr on current line
report("no '}' on same line before 'else ... {'") if $brace_after;
}
} elsif (parens_balance($tail) == 0) { # avoid false positive due to unfinished expr on current line
report("no '{' on same line after '} else'") if $brace_before && !$brace_after;
}
}
POSTPROCESS_DIRECTIVE:
# on begin of multi-line preprocessor directive, adapt indent
# need to use original line contents because trailing '\' may have been stripped above
if ($contents =~ m/^(.*?)[\s@]*\\[\s@]*$/) { # trailing '\' (which is not stripped from $contents),
# typically used in macro definitions (or other preprocessor directives)
if ($in_directive == 0) {
$in_macro_header = m/^\s*#\s*define(\W|$)?(.*)/ ? 1 + parens_balance($2) : 0; # '#define' is beginning
$directive_offset = INDENT_LEVEL;
$block_indent += $directive_offset;
}
$in_directive += 1;
}
# post-processing at end of line @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
LINE_FINISHED:
# on end of multi-line preprocessor directive, adapt indent
if ($in_directive > 0 &&
# need to use original line contents because trailing \ may have been stripped
!($contents =~ m/^(.*?)[\s@]*\\[\s@]*$/)) { # no trailing '\'
$block_indent -= $directive_offset;
$in_directive = 0;
# macro body typically does not include terminating ';'
$hanging_offset = 0; # compensate for this in case macro ends, e.g., as 'while (0)'
}
unless (m/^\s*$/) { # not essentially empty line: just whitespace (and maybe a '\')
if ($line_before > 0) {
my $linediff = $line - $line_before - 1;
report("$linediff empty lines before") if $linediff > 1;
}
$line_before2 = $line_before;
$contents_before2 = $contents_before;
$contents_before_2 = $contents_before_;
$line_before = $line;
$contents_before = $contents;
$contents_before_ = $_;
$count_before = $count;
}
if ($self_test) { # debugging
my $should_report = $contents =~ m/\*@(\d)?/ ? 1 : 0;
$should_report = +$1 if $should_report != 0 && defined $1;
print("$ARGV:$line:$num_reports_line reports on:$contents")
if $num_reports_line != $should_report;
}
$num_reports_line = 0;
# post-processing at end of file @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
if (eof) {
# check for essentially empty line (which may include a '\') just before EOF
report(($1 eq "\n" ? "empty line" : $2 ne "" ? "'\\'" : "whitespace")." at EOF")
if $contents =~ m/^(\s*(\\?)\s*)$/;
# report unclosed expression-level nesting
check_nested_nonblock_indents("expr at EOF"); # also adapts @nested_block_indents
# sanity-check balance of block-level { ... } via final $block_indent at end of file
report_flexibly($line, +@nested_block_indents." unclosed '{'", "(EOF)\n") if @nested_block_indents != 0;
# sanity-check balance of #if ... #endif via final preprocessor directive indent at end of file
report_flexibly($line, "$directive_nesting unclosed '#if'", "(EOF)\n") if $directive_nesting != 0;
reset_file_state();
}
}
# final summary report @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
my $num_other_reports = $num_reports - $num_indent_reports - $num_nesting_issues
- $num_syntax_issues - $num_SPC_reports - $num_length_reports;
print "$num_reports ($num_indent_reports indentation, $num_nesting_issues directive nesting, ".
"$num_syntax_issues syntax, $num_SPC_reports whitespace, $num_length_reports length, $num_other_reports other)".
" issues have been found by $0\n" if $num_reports != 0 && !$self_test;
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