src/third_party/blink/Tools/Scripts/report-include-statistics

#!/usr/bin/perl -w

# Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
#
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# modification, are permitted provided that the following conditions
# are met:
#
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
# 2.  Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
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#     its contributors may be used to endorse or promote products derived
#     from this software without specific prior written permission.
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# "report-include-statistics" script for WebKit Open Source Project

use strict;
use File::Find;

find(\&wanted, @ARGV ? @ARGV : ".");

my %paths;
my %sources;
my %includes;

sub wanted
{
    my $file = $_;

    if ($file eq "icu") {
        $File::Find::prune = 1;
        return;
    }

    if ($file !~ /^\./ && $file =~ /\.(h|cpp|c|mm|m)$/) {
        $paths{$file} = $File::Find::name;
        $sources{$file} = $File::Find::name if $file !~ /\.h/;
        open FILE, $file or die;
        while (<FILE>) {
            if (m-^\s*#\s*(include|import)\s+["<]((\S+/)*)(\S+)[">]-) {
                my $include = ($2 eq "sys/" ? $2 : "") . $4;
                $includes{$file}{$include}++;
            }
        }
        close FILE;
    }
}

my %totalIncludes;

sub fillOut
{
    my ($file) = @_;

    return if defined $totalIncludes{$file};

    for my $include (keys %{ $includes{$file} }) {
        $totalIncludes{$file}{$include} = 1;
        fillOut($include);
        for my $i (keys %{ $totalIncludes{$include} }) {
            $totalIncludes{$file}{$i} = 1;
        }
    }
}

my %inclusionCounts;
for my $file (keys %includes) {
    $inclusionCounts{$file} = 0;
    fillOut($file);
}

for my $file (keys %sources) {
    for my $include (keys %{ $totalIncludes{$file} }) {
        $inclusionCounts{$include}++;
    }
}

for my $file (sort mostincludedcmp keys %includes) {
    next if !$paths{$file};
    my $count = $inclusionCounts{$file};
    my $numIncludes = keys %{ $includes{$file} };
    my $numTotalIncludes = keys %{ $totalIncludes{$file} };
    print "$file is included $count times, includes $numIncludes files directly, $numTotalIncludes files total.\n"
}

# Sort most-included files first.
sub mostincludedcmp($$)
{
    my ($filea, $fileb) = @_;

    my $counta = $inclusionCounts{$filea} || 0;
    my $countb = $inclusionCounts{$fileb} || 0;
    return $countb <=> $counta if $counta != $countb;

    my $ta = keys %{ $totalIncludes{$filea} };
    my $tb = keys %{ $totalIncludes{$fileb} };
    return $ta <=> $tb if $ta != $tb;

    return $filea cmp $fileb;
}