从Mako模板输出中去除空白（定向塔）
[英]Strip whitespace from Mako template output (Pylons)
问题描述
I'm using Mako + Pylons and I've noticed a horrendous amount of whitespace in my HTML output. 
我使用的是Mako + Pylons，我注意到HTML输出中有大量空白。
How would I go about getting rid of it? 我将如何摆脱它？ Reddit manage to do it. Reddit设法做到了。
5 个解决方案
解决方案1
8 2010-10-06 01:14:13
There's the backslash thing. 有反斜杠的东西。
Look at the homepage of mako http://makotemplates.org for an example. 请参阅mako的主页http://makotemplates.org作为示例。
<%def name="makerow(row)">
<tr>
% for name in row:
<td>${name}</td>\
% endfor
</tr>
</%def>
But seriously, I wouldn't spend to much time trying to format correctly the ouput. 但认真的说，我不会花很多时间尝试正确格式化输出。 What is important is to have readable template code. 重要的是要具有可读的模板代码。 I use the web inspector of Webkit (or FireBug, if you prefer) more often than "view source". 我比“查看源代码”更频繁地使用Webkit（或FireBug，如果您愿意）的Web检查器。
If really you want good formatted html output, you could always write a middleware that does that. 如果确实要获得格式良好的html输出，则可以始终编写实现此目的的中间件。
解决方案2
4 2010-10-06 04:25:41
The only way to do this without post-processing would be to avoid whitespace in the template. 无需后处理的唯一方法是避免模板中的空格。 However, that will make things very hard for you as a developer. 但是，这将使您作为开发人员感到非常困难。
You need to make a decision about whether the time to clean the HTML string after the template has been rendered will save sufficient bandwidth to offset this cost. 您需要确定在呈现模板后清理HTML字符串的时间是否会节省足够的带宽以抵消此成本。 I recommend using optimized C code library to do this for you, such as lxml.html . 我建议使用优化的C代码库为您做到这一点，例如lxml.html 。
>>> from lxml import html
>>> page = html.fromstring("""<html>
...
... <body>yuck, a newline! bandwidth wasted!</body>
... </html>""")
>>> html.tostring(page)
'<html><body>yuck, a newline! bandwidth wasted!</body></html>'
解决方案3
2 已采纳 2010-10-06 01:13:20
I'm not sure if there's a way to do it within Mako itself but you can always just do some post-rendering processing before you serve up the page. 我不确定Mako本身是否有办法做到这一点，但是您始终可以在提供页面之前进行一些后期渲染处理。 For example, say you have the following code that generates your horrendous whitespace: 例如，假设您有以下代码生成可怕的空白：
from mako import TemplateLookup
template_lookup = TemplateLookup(directories=['.'])
template = template_lookup.get_template("index.mako")
whitespace_mess = template.render(somevar="no whitespace here")
return whitespace_mess # Why stop here?
You could add in an extra step like so: 您可以像这样添加额外的步骤：
from mako import TemplateLookup
template_lookup = TemplateLookup(directories=['.'])
template = template_lookup.get_template("index.mako")
whitespace_mess = template.render(somevar="no whitespace here")
cleaned_up_output = cleanup_whitespace(whitespace_mess)
return cleaned_up_output
...where cleanup_whitespace() is some function that does what you want (it could pass it through HTML Tidy or slimmer or whatever). ...其中cleanup_whitespace（）是执行您想要的功能的函数（可以通过HTML Tidy或slimer或其他方法传递它）。 It isn't the most efficient way to do it but it makes for a quick example :) 这不是最有效的方法，但是可以举一个简单的例子：）
解决方案4
0 2016-05-19 22:55:48
Similar to Dan's answer, I passed the rendered output through this function which only preserves "deliberate" whitespace. 与Dan的答案类似，我通过此函数传递了呈现的输出，该函数仅保留“故意的”空白。 I defined that to be two carrage returns in a row (ie an empty line) 我定义为连续两个角叉车返回（即空行）
So 所以
Hello
There
Becomes 成为
Hello There
But 但
Hello
There
Becomes 成为
Hello
There
Here's the code 这是代码
def filter_newline(input):
rendered_output = []
for line in input.split("\n"):
if line:
# Single new-lines are removed
rendered_output.append(line)
else:
# Subsequent newlines (so no body to the interveaning line) are retained
rendered_output.append("\n")
return "".join( rendered_output )
Execute like so (I stole part of Dan's example) 这样执行（我偷了Dan的示例的一部分）
whitespace_mess = template.render(somevar="Hello \nThere")
cleaned_up_output = filter_newline(whitespace_mess)
解决方案5
0 2010-10-06 00:27:27
如果数据不是太动态，则可以存储模板输出的优化缓存并将其提供给Web客户端。
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