从xml属性中查找并执行数学表达式并替换该值

Question

以下是一些需要处理的xml文件的摘录:

<BirimAdi>Adet</BirimAdi>
<BirimCarpan>1</BirimCarpan>
<HavaleFiyati>0</HavaleFiyati>
<HavaleFiyatiParaBirimi>TL</HavaleFiyatiParaBirimi>
<Price1>0</Price1>
<SatisFiyati1ParaBirimi>TL</SatisFiyati1ParaBirimi>
<Isk1>0</Isk1>
<SatisFiyati2>0</SatisFiyati2>

我需要做的是获取标签之间的值,并对其进行以下数学运算.

Price1 = round(Price1)-0.1;

该脚本应该对指定路径中的所有xml文件执行此操作.

我考虑使用'sed'或'awk',但我不确定这可以在sed中轻松完成.使用xmllint对我来说太过分了.有任何想法吗？我是这些实用程序的新手,所以无法想到找到我想要的那个正则表达式是:

/<\s*Price1[^>]*>([^<]*)<\s*\/\s*Price1\s*>/

Answer 1

我会使用XML解析器来完成这项工作.例如,XML::Twig.这是一个例子:

#!/usr/bin/env perl

use warnings;
use strict;
use XML::Twig;

for my $f ( @ARGV ) {
        my $twig = XML::Twig->new(
                twig_handlers => {
                        'Price1' => sub { $_->set_text( sprintf( "%.1f", int( $_->text) - 0.1 ) ) },
                },
                pretty_print => 'indented',
        )->parsefile( $f )->print;
}

假设文件名是script.pl和xmlfile包含内容的测试文件:

<root>
<BirimAdi>Adet</BirimAdi>
<BirimCarpan>1</BirimCarpan>
<HavaleFiyati>0</HavaleFiyati>
<HavaleFiyatiParaBirimi>TL</HavaleFiyatiParaBirimi>
<Price1>3.3</Price1>
<SatisFiyati1ParaBirimi>TL</SatisFiyati1ParaBirimi>
<Isk1>0</Isk1>
<SatisFiyati2>0</SatisFiyati2>
</root>

运行它像:

perl script.pl xmlfile

产量:

<root>
  <BirimAdi>Adet</BirimAdi>
  <BirimCarpan>1</BirimCarpan>
  <HavaleFiyati>0</HavaleFiyati>
  <HavaleFiyatiParaBirimi>TL</HavaleFiyatiParaBirimi>
  <Price1>2.9</Price1>
  <SatisFiyati1ParaBirimi>TL</SatisFiyati1ParaBirimi>
  <Isk1>0</Isk1>
  <SatisFiyati2>0</SatisFiyati2>
</root>