python:一个用于包装通过电子邮件约定引用的文本的模块

Question

我正在寻找一个python模块或一些现有的python代码，它们可以用来包装使用">"行前缀表示引用文本的文本(请参阅下面的示例)。

我知道我可以使用pythontextwrappe模块对文本段落进行换行。然而，该模块不知道这种引用前缀。

我知道如何编写一个例程来执行这种文本包装，我并不是在寻求如何编写它的建议。相反，我想知道是否有人知道任何已经存在的python代码或python模块，它们已经能够对电子邮件类型的引引文本执行这种包装。

我一直在找，但在蟒蛇身上什么也没找到。

我只是不想"重新发明轮子"，如果已经写了这样的东西的话。

下面是我想要执行的文本换行的示例。假设我有以下来自假设电子邮件的文本：

Abc defg hijk lmnop.
Mary had a little lamb.
Her fleas were white as snow,
> Now is the time for all good men to come to the aid of their party.
>
> The quick
> brown fox jumped over the lazy sleeping dog.
>> When in the Course of human
>> events it
>> becomes necessary for one people to dissolve the political
>> bands
>> which have
>> connected them ...
and everywhere that Mary went,
her fleas were sure to go
... and to reproduce.
> What do you mean by this?
>> with another
>> and to assume among
>> the powers of the earth ...
> Doo wah diddy, diddy dum, diddy doo.
>> Text text text text text text text text text text text text text text text text text text text text text text text text text text text.

假设我想在第52列换行，结果文本应该是这样的：

Abc defg hijk lmnop.
Mary had a little lamb. Her fleas were white as
snow,
> Now is the time for all good men to come to the
> aid of their party.
>
> The quick brown fox jumped over the lazy sleeping
> dog.
>> When in the Course of human events it becomes
>> necessary for one people to dissolve the
>> political bands which have connected them ...
and everywhere that Mary went, her fleas were
sure to go ... and to reproduce.
> What do you mean by this?
>> with another and to assume among the powers of
>> the earth ...
> Doo wah diddy, diddy dum, diddy doo.
>> Text text text text text text text text text text
>> text text text text text text text text text text
>> text text text text text text text.

感谢您对现有python代码的任何引用。

如果"野外"不存在这样的东西，我会写下这篇文章并在这里发布我的代码。

非常感谢。

Answer 1

我找不到任何现有的代码来包装这种引用的文本，所以这是我写的代码。它使用re和textwrap模块。

我根据首引号或缩进字符的数量将代码分成"段落"。然后，我使用textwrap将每一行中的引号或缩进前缀都去掉，以包裹每一个"段落"。包装后，我重新为"段落"的每一行加上前缀。

总有一天我会清理代码，让它变得更优雅，但至少它看起来工作得很好

import re
import textwrap
def wrapemail(text, wrap=72):
if not text:
return ''
prefix      = None
prev_prefix = None
paragraph   = []
paragraphs  = []
for line in text.rstrip().split('n'):
line = line.rstrip()
m = wrapemail.qprefixpat.search(line)
if m:
prefix = wrapemail.whitepat.sub('', m.group(1))
text   = m.group(2)
if text and wrapemail.whitepat.search(text[0]):
prefix += text[0]
text    = text[1:]
else:
m = wrapemail.wprefixpat.search(line)
if m:
prefix = m.group(1)
text   = m.group(2)
else:
prefix = ''
text   = line
if not text:
if paragraph and prev_prefix is not None:
paragraphs.append((prev_prefix, paragraph))
paragraphs.append((prefix, ['']))
prev_prefix = None
paragraph   = []
elif prefix != prev_prefix:
if paragraph and prev_prefix is not None:
paragraphs.append((prev_prefix, paragraph))
prev_prefix = prefix
paragraph   = []
paragraph.append(text)
if paragraph and prefix is not None:
paragraphs.append((prefix, paragraph))
result = ''
for paragraph in paragraphs:
prefix = paragraph[0]
text   = 'n'.join(paragraph[1]).rstrip()
wraplen = wrap - len(prefix)
if wraplen < 1:
result += '{}{}n'.format(prefix, text)
elif text:
for line in textwrap.wrap(text, wraplen):
result += '{}{}n'.format(prefix, line.rstrip())
else:
result += '{}n'.format(prefix)
return result
wrapemail.qprefixpat = re.compile(r'^([s>]*>)([^>]*)$')
wrapemail.wprefixpat = re.compile(r'^(s+)(S.*)?$')
wrapemail.whitepat   = re.compile(r's')

用指定为52的"wrap"将我原始消息中的文本输入它，确实会产生我上面指定的输出。

请随意改进或窃取。：)