如何在 XML 文件的 xi:include 中使用环境变量？

发布于 2024-08-17 18:45:12 字数 303 浏览 8 评论 0原文

我想在 XML 文件的 xi:include 节点的 href 链接中使用环境变量。目前 Perl XInclude 解析器不支持任何变量，只支持绝对路径。有没有一种方法可以克服这个问题？例如，我的 xi:include 节点将如下所示：

<xi:include href="$GLOBAL_ROOT/alternative.xml">

稍后可以通过加载不同的设置来更改由 $GLOBAL_ROOT 引用的路径，并且解析器仍然应该能够在相应的位置查找该文件。

原文

I would like to use an environment variable in the href link of the xi:include node of an XML file. Currently the Perl XInclude parser doesn't support any variables but only absolute paths. Is there a method where this can be overcome?
for example, my xi:include node will look like this:

<xi:include href="$GLOBAL_ROOT/alternative.xml">

The path referred by $GLOBAL_ROOT can be changed later by loading a different setting and still the parser should be able to look up in the respective location for the file.

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余生再见 2024-08-24 18:45:12

为什么不使用符号链接（相对或绝对）？或用户主目录位置（~/.xml）？

<xi:include href="XML/alternative.xml">

<xi:include href="/XML/alternative.xml">

<xi:include href="~/.XML/alternative.xml">

Why not use a symbolic link (either relative or absolute)? or a user home dir location (~/.xml)?

<xi:include href="XML/alternative.xml">

<xi:include href="/XML/alternative.xml">

<xi:include href="~/.XML/alternative.xml">

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清风疏影 2024-08-24 18:45:12

您在专门使用私有方法（按照惯例用前导下划线表示）的基础上不稳定，但作者可以通过提供更多钩子来提供帮助。假设您正在使用 XML::Filter::XInclude：

package MyXInclude::ExpandEnvironmentVars;

use warnings;
use strict;

our @ISA = qw/ XML::Filter::XInclude /;

sub _include_xml_document {
  my($self,$url) = @_;

  # expand environment variables if present
  $url =~ s/\$(\w+)/$ENV{$1}/g;

  $self->SUPER::_include_xml_document($url);
}

然后向工厂传递一个 MyXInclude::ExpandEnvironmentVars 实例作为 Handler 参数。

You're on shaky ground specializing a private method (indicated by convention with a leading underscore), but the author could help by providing more hooks. Assuming you're using XML::Filter::XInclude:

package MyXInclude::ExpandEnvironmentVars;

use warnings;
use strict;

our @ISA = qw/ XML::Filter::XInclude /;

sub _include_xml_document {
  my($self,$url) = @_;

  # expand environment variables if present
  $url =~ s/\$(\w+)/$ENV{$1}/g;

  $self->SUPER::_include_xml_document($url);
}

Then pass the factory an instance of MyXInclude::ExpandEnvironmentVars as the Handler parameter.

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~没有更多了~