Perl解析INI檔案

copy from http://www.lwolf.cn/blog/article/program/perl-ini.html

之前有寫過用C#解析INI檔案的文章，那時是因為要用Perl來解析INI，後來就在網上找了個現成的解析代碼IniParser. 
      假設INI檔案是這樣的：

[Directories]
Input=c:\autoexec.bat

      使用方法如下：

use IniParser;
my $ini = IniParser->new("c:\\test.ini");
my $inputdir    = $ini->expectEntry("Directories","Input");

      以下是IniParser的代碼：

#-------------------------------------------------------------------------------
# IniParser. Version 1.0
# A freeware module for parsing .ini files.
# Joachim Pimiskern, September 13, 2003
#-------------------------------------------------------------------------------
package IniParser;
use strict;

sub new
{
my ($class,$filename) = @_;
my $data = {
             filename => $filename
            };
bless($data,$class);
$data->read($filename);
return $data;
}

sub read
{
my ($self,$filename) = @_;
my $sectionName = "Global";
my $section     = {};
my $line;
local *FP;

$self->{$sectionName} = $section;

open(FP,"<$filename") or die "read(): can't open $filename for read: $!";
while (defined ($line = <FP>))
{
chomp($line);
if ($line =~ /^\s*(.*?)\s*=\s*(.*?)\s*(;.*)?$/) # Assignment 
     {
my $left  = $1;
my $right = $2;
$section->{$left} = $right;
     }
elsif ($line =~ /^\s*\[\s*(.*?)\s*\]\s*(;.*)?$/) # Section name
     {
$sectionName = $1;
$section     = {};
$self->{$sectionName} = $section;
     }
elsif ($line =~ /^\s*(;.*)?$/) # Comment
     {
     }
else
     {
die "read(): illegal line <$line> in file $filename.";
     }
} 
close(FP);
}

sub expectSection
{
my ($self,$section) = @_;
my $filename = $self->{filename};

if (! exists $self->{$section})
    {
die "expectSection(): $filename has no section [$section]";
    }
return $self->{$section};
}

sub expectEntry
{
my ($self,$section,$left) = @_;
my $filename    = $self->{filename};
my $sectionHash = $self->expectSection($section);

if (! exists $sectionHash->{$left})
    {
die "expectEntry(): $filename, section [$section] has no $left entry";
    }
return $sectionHash->{$left};
}

1;