1#!/usr/bin/perl -w
2
3# Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8#
9# 1.  Redistributions of source code must retain the above copyright
10#     notice, this list of conditions and the following disclaimer.
11# 2.  Redistributions in binary form must reproduce the above copyright
12#     notice, this list of conditions and the following disclaimer in the
13#     documentation and/or other materials provided with the distribution.
14# 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15#     its contributors may be used to endorse or promote products derived
16#     from this software without specific prior written permission.
17#
18# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29# Used for helping remove extra blank lines from files when processing.
30# see split-class for an example usage (or other scripts in bugzilla)
31
32BEGIN {
33   use Exporter   ();
34   our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
35   $VERSION     = 1.00;
36   @ISA         = qw(Exporter);
37   @EXPORT      = qw(&resetSpacingHeuristics &isOnlyWhiteSpace &applySpacingHeuristicsAndPrint &setPreviousAllowedLine &setPreviousAllowedLine &printPendingEmptyLines &ignoringLine);
38   %EXPORT_TAGS = ();
39   @EXPORT_OK   = ();
40}
41
42our @EXPORT_OK;
43
44my $justFoundEmptyLine = 0;
45my $previousLineWasDisallowed = 0;
46my $previousAllowedLine = "";
47my $pendingEmptyLines = "";
48
49sub resetSpacingHeuristics
50{
51    $justFoundEmptyLine = 0;
52    $previousLineWasDisallowed = 0;
53    $previousAllowedLine = "";
54    $pendingEmptyLines = "";
55}
56
57sub isOnlyWhiteSpace
58{
59    my $line = shift;
60    my $isOnlyWhiteSpace = ($line =~ m/^\s+$/);
61    $pendingEmptyLines .= $line if ($isOnlyWhiteSpace);
62    return $isOnlyWhiteSpace;
63}
64
65sub applySpacingHeuristicsAndPrint
66{
67    my ($out, $line) = @_;
68
69    printPendingEmptyLines($out, $line);
70    $previousLineWasDisallowed = 0;
71    print $out $line;
72}
73
74sub setPreviousAllowedLine
75{
76    my $line = shift;
77    $previousAllowedLine = $line;
78}
79
80sub printPendingEmptyLines
81{
82    my $out = shift;
83    my $line = shift;
84    if ($previousLineWasDisallowed) {
85        if (!($pendingEmptyLines eq "") && !($previousAllowedLine =~ m/{\s*$/) && !($line =~ m/^\s*}/)) {
86            $pendingEmptyLines = "\n";
87        } else {
88            $pendingEmptyLines = "";
89        }
90    }
91    print $out $pendingEmptyLines;
92    $pendingEmptyLines = "";
93}
94
95sub ignoringLine
96{
97    # my $line = shift; # ignoring input argument
98    $previousLineWasDisallowed = 1;
99}
100
1011;