#!/bin/sh -- # This comment tells perl not to loop!
#
#**************************************************************
#  
#  Licensed to the Apache Software Foundation (ASF) under one
#  or more contributor license agreements.  See the NOTICE file
#  distributed with this work for additional information
#  regarding copyright ownership.  The ASF licenses this file
#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
#  with the License.  You may obtain a copy of the License at
#  
#    http://www.apache.org/licenses/LICENSE-2.0
#  
#  Unless required by applicable law or agreed to in writing,
#  software distributed under the License is distributed on an
#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
#  KIND, either express or implied.  See the License for the
#  specific language governing permissions and limitations
#  under the License.
#  
#**************************************************************

**


eval 'exec perl -S $0 "$@"'
if 0;
#
# @(#)jstyle 1.2 98/01/08
#
# jstyle - check for some common stylistic errors.
#
#	jstyle is a sort of "lint" for Java coding style.
#
#	There's a lot this can't check for, like proper
#	indentation of continuation lines.  There's also
#	a lot more this could check for.
#
#	A note to the non perl literate:
#
#		perl regular expressions are pretty much like egrep
#		regular expressions, with the following special symbols
#
#		\s	any space character
#		\S	any non-space character
#		\w	any "word" character [a-zA-Z0-9_]
#		\W	any non-word character
#		\d	a digit [0-9]
#		\D	a non-digit
#		\b	word boundary (between \w and \W)
#		\B	non-word boundary
#
#require "getopts.pl";
# XXX - because some versions of perl can not find the lib directory,
# we just include this here.
;# getopts.pl - a better getopt.pl

;# Usage:
;#      do Getopts("a:bc");  # -a takes arg. -b & -c not. Sets opt_* as a
;#                           #  side effect.

sub Getopts {
    local($argumentative) = @_;
    local(@args,$_,$first,$rest);
    local($[) = 0;
    local($errs) = 0;

    @args = split( / */, $argumentative );
    while(($_ = $ARGV[0]) =~ /^-(.)(.*)/) {
	($first,$rest) = ($1,$2);
	$pos = index($argumentative,$first);
	if($pos >= $[) {
	    if($args[$pos+1] eq ":") {
		shift(@ARGV);
		if($rest eq "") {
		    $rest = shift(@ARGV);
		}
		eval "\$opt_$first = \$rest;";
	    }
	    else {
		eval "\$opt_$first = 1";
		if($rest eq "") {
		    shift(@ARGV);
		}
		else {
		    $ARGV[0] = "-$rest";
		}
	    }
	}
	else {
	    print STDERR "Unknown option: $first\n";
	    ++$errs;
	    if($rest ne "") {
		$ARGV[0] = "-$rest";
	    }
	    else {
		shift(@ARGV);
	    }
	}
    }
    $errs == 0;
}

1;
# end of getopts.pl

$usage =
"usage: jstyle [-c] [-h] [-p] [-s] [-t] [-v] [-C] file ...
	-c	check continuation line indenting
	-h	perform heuristic checks that are sometimes wrong
	-p	perform some of the more picky checks
	-s	check for spaces vs. tabs
	-t	insist on indenting by tabs
	-v	verbose
	-C	don't check anything in header block comments
	-S	print out overall statistics
";

if (!&Getopts("chpstvCS")) {
	print $usage;
	exit 1;
}

$check_continuation = $opt_c;
$heuristic = $opt_h;
$picky = $opt_p;
$spaces = $opt_s;
$tabs = $opt_t;
$verbose = $opt_v;
$ignore_hdr_comment = $opt_C;
$statistics = $opt_S;

if ($verbose) {
	$fmt = "%s: %d: %s\n%s\n";
} else {
	$fmt = "%s: %d: %s\n";
}

# Note, following must be in single quotes so that \s and \w work right.
$typename = '(int|char|boolean|byte|short|long|float|double)';

if ($#ARGV >= 0) {
	foreach $arg (@ARGV) {
		if (!open(STDIN, $arg)) {
			printf "%s: can not open\n", $arg;
		} else {
			&jstyle($arg);
			close STDIN;
		}
	}
} else {
	&jstyle("<stdin>");
}

if ($statistics != 0) {
	foreach $key (sort(keys %errcount)) {
		printf "%6d %s\n", $errcount{$key}, $key;
	}
	printf " -----\n";
	printf "%6d Total warnings\n", $tot_errcount;
	printf "%6d Lines of code\n", $totlines;
}

sub err {
	if ($statistics == 0) {
		printf $fmt, $filename, $., $_[0], $line;
	} else {
		$msg = $_[0];
		$msg =~ s/ \([0-9][0-9]*\)$//;
		$errcount{$msg} += 1;
		$tot_errcount += 1;
	}
}

sub jstyle {

$in_comment = 0;
$in_header_comment = 0;
$in_continuation = 0;
$in_class = 0;
$in_declaration = 0;
$note_level = 0;
$nextok = 0;
$nocheck = 0;
$expect_continuation = 0;
$prev = '';

$filename = $_[0];

line: while (<STDIN>) {
	++$totlines;
	s/\r?\n$//;	# strip return and newline

	# save the original line, then remove all text from within
	# double or single quotes, we do not want to check such text.

	$line = $_;
	s/"[^"]*"/\"\"/g;
	s/'.'/''/g;

	# an /* END JSTYLED */ comment ends a no-check block.
	if ($nocheck) {
		if (/\/\* *END *JSTYLED *\*\//) {
			$nocheck = 0;
		} else {
			next line;
		}
	}

	# a /*JSTYLED*/ comment indicates that the next line is ok.
	if ($nextok) {
		if ($okmsg) {
			do err($okmsg);
		}
		$nextok = 0;
		$okmsg = 0;
		if (/\/\* *JSTYLED.*\*\//) {
			/^.*\/\* *JSTYLED *(.*) *\*\/.*$/;
			$okmsg = $1;
			$nextok = 1;
		}
		$prev = $line;
		next line;
	}

	# check length of line.
	# first, a quick check to see if there is any chance of being too long.
	if ($line =~ tr/\t/\t/ * 7 + length($line) > 100) {
		# yes, there is a chance.
		# replace tabs with spaces and check again.
		$eline = $line;
		1 while $eline =~
		    s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e;
		$l = length($eline);
		if (length($eline) > 100) {
			do err("line > 100 characters ($l)");
		}
	}
#	this is the fastest way to check line length,
#	but it doesnt work with perl 3.0.
#	if ($line =~ tr/\t/\t/ * 7 + length($line) > 80) {
#		$pos = $oldp = $p = 0;
#		while (($p = index($line, "\t", $p)) >= 0) {
#			$pos = ($pos + $p - $oldp + 8) & ~7;
#			$oldp = ++$p;
#		}
#		$pos += length($line) - $oldp;
#		if ($pos > 80) {
#			do err("line > 80 characters");
#		}
#	}

	# remember whether we expect to be inside a continuation line.
	$in_continuation = $expect_continuation;

	# check for proper continuation line.  blank lines
	# in the middle of the
	# continuation do not count.
	# XXX - only check within functions.
	if ($check_continuation && $expect_continuation && $in_class &&
	    !/^\s*$/) {
		# continuation line must start with whitespace of
		# previous line, plus either 4 spaces or a tab, but
		# do not check lines that start with a string constant
		# since they are often shifted to the left to make them
		# fit on the line.
		if (!/^$continuation_indent    \S/ &&
		    !/^$continuation_indent\t\S/ && !/^\s*"/) {
			do err("continuation line improperly indented");
		}
		$expect_continuation = 0;
	}

	# a /* BEGIN JSTYLED */ comment starts a no-check block.
	if (/\/\* *BEGIN *JSTYLED *\*\//) {
		$nocheck = 1;
	}

	# a /*JSTYLED*/ comment indicates that the next line is ok.
	if (/\/\* *JSTYLED.*\*\//) {
		/^.*\/\* *JSTYLED *(.*) *\*\/.*$/;
		$okmsg = $1;
		$nextok = 1;
	}
	if (/\/\/ *JSTYLED/) {
		/^.*\/\/ *JSTYLED *(.*)$/;
		$okmsg = $1;
		$nextok = 1;
	}

	# is this the beginning or ending of a class?
	if (/^(public\s+)*\w(class|interface)\s/) {
		$in_class = 1;
		$in_declaration = 1;
		$prev = $line;
		next line;
	}
	if (/^}\s*(\/\*.*\*\/\s*)*$/) {
		$in_class = 0;
		$prev = $line;
		next line;
	}

	if (!$spaces) {
		# strip trailing spaces
		s/\s*$//;
	}

	# does this looks like the start of a block comment?
	if (/^\s*\/\*(\*|)$/) {
		if (!/^(\t|    )*\/\*(\*|)$/) {
			do err("block comment not indented properly");
		}
		$in_comment = 1;
		s/\/\*(\*|)/ /;
		$comment_prefix = $_;
		if ($comment_prefix eq " ") {
			$in_header_comment = 1;
		}
		$prev = $line;
		next line;
	}
	if (/^\s*\/\*./ && !/^\s*\/\*\*$/ && !/^\s*\/\*.*\*\//) {
		do err("improper first line of block comment");
		# it's a bad one, but it still is one.
		# avoid ripple effect of not recognizing this.
		if (!/^(\t|    )*\/\*(\*|)/) {
			do err("block comment not indented properly");
		}
		$in_comment = 1;
		s/\/\*.*/ /;
		$comment_prefix = $_;
		if ($comment_prefix eq " ") {
			$in_header_comment = 1;
		}
		$prev = $line;
		next line;
	}
	# are we still in the block comment?
	if ($in_comment && !/^$comment_prefix\*/) {
		# assume out of comment
		$in_comment = 0;
		$in_header_comment = 0;
	}

	if ($in_header_comment && $ignore_hdr_comment) {
		$prev = $line;
		next line;
	}

	# check for errors that might occur in comments and in code.

	# allow spaces to be used to draw pictures in header comments.
	if ($spaces && /[^ ]     / && !/".*     .*"/ && !$in_header_comment) {
		do err("spaces instead of tabs");
	}
	if ($tabs && /^ / && !/^ \*[ \t\/]/ && !/^ \*$/ &&
	    (!/^    \w/ || $in_class != 0)) {
		do err("indent by spaces instead of tabs");
	}
	if (!$in_comment && (/^(\t    )* {1,3}\S/ || /^(\t    )* {5,7}\S/) &&
	    !(/^\s*[-+|&\/?:=]/ || ($prev =~ /,\s*$/))) {
		do err("indent not a multiple of 4");
	}
	if ($spaces && /\s$/) {
		do err("space or tab at end of line");
	}
if (0) {
	if (/^[\t]+ [^ \t\*]/ || /^[\t]+  \S/ || /^[\t]+   \S/) {
		do err("continuation line not indented by 4 spaces");
	}
}
	if (/[^ \t(]\/\*/ && !/\w\(\/\*.*\*\/\);/) {
		do err("comment preceded by non-blank");
	}
	if ($spaces && /\t[ ]+\t/) {
		do err("spaces between tabs");
	}
	if ($spaces && / [\t]+ /) {
		do err("tabs between spaces");
	}

	if ($in_comment) {	# still in comment
		$prev = $line;
		next line;
	}

	if ((/\/\*\S/ && !/\/\*\*/) || /\/\*\*\S/) {
		do err("missing blank after open comment");
	}
	if (/\S\*\//) {
		do err("missing blank before close comment");
	}
	# allow // at beginnging of line, often used to comment out code
	if (/.\/\/\S/) {		# C++ comments
		do err("missing blank after start comment");
	}
	# check for unterminated single line comments.
	if (/\S.*\/\*/ && !/\S.*\/\*.*\*\//) {
		do err("unterminated single line comment");
	}

	# delete any comments and check everything else.
	s/\/\*.*\*\//
/g;
	s/\/\/.*$/
/;		# C++ comments

	# delete any trailing whitespace; we have already checked for that.
	s/\s*$//;

	# following checks do not apply to text in comments.

	# if it looks like an operator at the end of the line, and it is
	# not really the end of a comment (...*/), and it is not really
	# a label (done:), and it is not a case label (case FOO:),
	# or we are not in a function definition (ANSI C style) and the
	# operator is a "," (to avoid hitting "int\nfoo(\n\tint i,\n\tint j)"),
	# or we are in a function and the operator is a
	# "*" (to avoid hitting on "char*\nfunc()").
	if ((/[-+|&\/?:=]$/ && !/\*\/$/ && !/^\s*\w*:$/ &&
	    !/^\s\s*case\s\s*\w*:$/) ||
	    /,$/ ||
	    ($in_class && /\*$/)) {
		$expect_continuation = 1;
		if (!$in_continuation) {
			/^(\s*)\S/;
			$continuation_indent = $1;
		}
	}
	if (/[^<>\s][!<>=]=/ || /[^<>][!<>=]=\S/ ||
	    (/[^->]>[^=>\s]/ && !/[^->]>$/) || (/[^<]<[^=<\s]/ && !/[^<]<$/) ||
	    /[^<\s]<[^<]/ || /[^->\s]>[^>]/) {
		do err("missing space around relational operator");
	}
	if (/\S>>=/ || /\S<<=/ || />>=\S/ || /<<=\S/ || /\S[-+*\/&|^%]=/ ||
	    (/[^-+*\/&|^%!<>=\s]=[^=]/ && !/[^-+*\/&|^%!<>=\s]=$/) ||
	    (/[^!<>=]=[^=\s]/ && !/[^!<>=]=$/)) {
		do err("missing space around assignment operator");
	}
	if (/[,;]\S/ && !/\bfor \(;;\)/) {
		do err("comma or semicolon followed by non-blank");
	}
	# allow "for" statements to have empty "while" clauses
	if (/\s[,;]/ && !/^[\t]+;$/ && !/^\s*for \([^;]*; ;[^;]*\)/) {
		do err("comma or semicolon preceded by blank");
	}
if (0) {
	if (/^\s*(&&|\|\|)/) {
		do err("improper boolean continuation");
	}
}
	if ($picky && /\S   *(&&|\|\|)/ || /(&&|\|\|)   *\S/) {
		do err("more than one space around boolean operator");
	}
	if (/\b(for|if|while|switch|return|case|catch|synchronized)\(/) {
		do err("missing space between keyword and paren");
	}
	if (/(\b(for|if|while|switch|return|catch|synchronized)\b.*){2,}/) {
		# multiple "case" allowed
		do err("more than one keyword on line");
	}
	if (/\b(for|if|while|switch|return|case|catch|synchronized)\s\s+\(/ &&
	    !/^#if\s+\(/) {
		do err("extra space between keyword and paren");
	}
	# try to detect "func (x)" but not "if (x)" or
	# "int (*func)();"
	if (/\w\s\(/) {
		$s = $_;
		# strip off all keywords on the line
		s/\b(for|if|while|switch|return|case|catch|synchronized)\s\(/XXX(/g;
		#s/\b($typename|void)\s+\(+/XXX(/og;
		if (/\w\s\(/) {
			do err("extra space between function name and left paren");
		}
		$_ = $s;
	}
	if (/\(\s/) {
		do err("whitespace after left paren");
	}
	# allow "for" statements to have empty "continue" clauses
	if (/\s\)/ && !/^\s*for \([^;]*;[^;]*; \)/) {
		do err("whitespace before right paren");
	}
	if (/^\s*\(void\)[^ ]/) {
		do err("missing space after (void) cast");
	}
	if (/\S{/ && !/{{/) {
		do err("missing space before left brace");
	}
	if ($in_class && /^\s+{/ && ($prev =~ /\)\s*$/)) {
		do err("left brace starting a line");
	}
	if (/}(else|while)/) {
		do err("missing space after right brace");
	}
	if (/}\s\s+(else|while)/) {
		do err("extra space after right brace");
	}
	if (/\b$typename\*/o) {
		do err("missing space between type name and *");
	}
	if ($heuristic) {
		# cannot check this everywhere due to "struct {\n...\n} foo;"
		if ($in_class && !$in_declaration &&
		    /}./ && !/}\s+=/ && !/{.*}[;,]$/ && !/}(\s|
)*$/ &&
		    !/} (else|while)/ && !/}}/) {
			do err("possible bad text following right brace");
		}
		# cannot check this because sub-blocks in
		# the middle of code are ok
		if ($in_class && /^\s+{/) {
			do err("possible left brace starting a line");
		}
	}
	if (/^\s*else\W/) {
		if ($prev =~ /^\s*}$/) {
			$str = "else and right brace should be on same line";
			if ($statistics == 0) {
				printf $fmt, $filename, $., $str, $prev;
				if ($verbose) {
					printf "%s\n", $line;
				}
			} else {
				$errcount{$str} += 1;
				$tot_errcount += 1;
			}
		}
	}
	$prev = $line;
}

if ($picky && $prev eq "") {
	do err("last line in file is blank");
}

}