解析 genshi 模板中 py:match 的相对路径
<py:match path="foo">
<?python
import os
href = select('@href').render()
SOMEWHERE = ... # what file contained the foo tag?
path = os.path.abspath(os.path.join(os.path.dirname(SOMEWHERE), href)
f = file(path,'r')
# (do something interesting with f)
?>
</py:match>
...
<foo href="../path/relative/to/this/template/abcd.xyz"/>
上面的“某处”应该是什么？ 我希望该 href 属性与其中包含 foo 标记的文件相关，就像其他标记上的 href 属性一样。
或者，哪个文件包含 py:match 块？ 这不太好，因为它可能与带有 foo 标记的文件位于不同的目录中。
更糟糕的是：我可以提供我正在渲染的文件的路径作为来自 Genshi 外部的上下文参数，但这可能位于与上述两个目录不同的目录中。
<py:match path="foo">
<?python
import os
href = select('@href').render()
SOMEWHERE = ... # what file contained the foo tag?
path = os.path.abspath(os.path.join(os.path.dirname(SOMEWHERE), href)
f = file(path,'r')
# (do something interesting with f)
?>
</py:match>
...
<foo href="../path/relative/to/this/template/abcd.xyz"/>
What should go as "somewhere" above? I want that href attribute to be relative to the file with the foo tag in it, like href attributes on other tags.
Alternatively, what file contained the py:match block? This is less good because it may be in a different directory from the file with the foo tag.
Even less good: I could supply the path of the file I'm rendering as a context argument from outside Genshi, but that might be in a different directory from both of the above.
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您需要确保驱动程序（即解析输入文件的Python程序）运行在包含
foo标签的文件的目录中。 否则，您需要将相对路径（即如何从阅读器运行的目录获取到正在读取的文件的目录）作为上下文参数传递给您的Python代码，并将其添加到os .path.join命令。通过此设置（并使用通过 Fink 包 genshi-py26 在 MacOS X 10.6.3 上安装的 Genshi 0.6），命令
os.getcwd()返回包含的文件的当前工作目录foo标签。对于如此复杂的路径构造，我还强烈建议使用
path=os.path.normpath(path)，因为您可能不希望这些内容在生成的 HTML 代码中泄漏。You need to make sure that the driver program (i.e., the Python program that parses the input file) runs in the directory of the file containing the
footag. Otherwise, you need to pass down the relative path (i.e., how to get from the directory in which the reader runs to the directory of the file being read) as a context argument to your Python code and add it to theos.path.joincommand.With this setup (and using Genshi 0.6 installed on MacOS X 10.6.3 via the Fink package genshi-py26) the command
os.getcwd()returns the current working directory of the file containing thefootag.For such complicated path constructs I also strongly recommend to use
path=os.path.normpath(path), since you may not want such things to leak in your resulting HTML code.