perl XML::Parser

使用Tree Style来解析xml文件

操作文件：

[root@dou xml]# cat sample1
<FORECAST>
  <OUTLOOK>
    Partly Cloudy
  </OUTLOOK>
  <TEMPERATURE TYPE="MAX" degrees="C">12</TEMPERATURE>
  <TEMPERATURE TYPE="MIN" degrees="C">6</TEMPERATURE>
</FORECAST>
 

XML::Parser中的Tree Style将xml文件内容转化为perl的数据结构如下：

[root@dou xml]# cat ch.pl
#!/usr/bin/perl -w
use strict;
use XML::Parser;
use Data::Dumper;

my $file = "sample1";
my $p = XML::Parser->new(Style => 'Tree');
my $doc = $p->parsefile($file);
print Dumper($doc);
[root@dou xml]# perl ch.pl
$VAR1 = [
          'FORECAST',
          [
            {},
            0,
            '
  ',
            'OUTLOOK',
            [
              {},
              0,
              '
    Partly Cloudy
  '
            ],
            'TEMPERATURE',
            [
              {
                'TYPE' => 'MAX',
                'degrees' => 'C'
              },
              '12'
            ],
            [
              {
                'TYPE' => 'MIN',
              '6'
            ],
            '
'
          ]
        ];
[root@dou xml]#
 

转换原理参照：http://search.cpan.org/~msergeant/XML-Parser-2.36/Parser.pm中的Style的Tree。

Tree

Parse will return a parse tree for the document. Each node in the tree takes the form of a tag,content pair. Text nodes are represented with a pseudo-tag of "0" and the string that is their content. For elements,the content is an array reference. The first item in the array is a (possibly empty) hash reference containing attributes. The remainder of the array is a sequence of tag-content pairs representing the content of the element.

基本上就是 element [匿名数组]一次类推下去，涉及到嵌套。

脚本运行结果如下：

[root@dou xml]# perl sample2.pl sample1 Outlook: Partly Cloudy MAX:12 C MIN:6 C