在python中检测markdown文件中的所有链接，并将其替换为字符串函数的输出 [英] Detecting all links in markdown files in python and replace them with outputs of string function

问题描述

我有一个python函数 f(foo:string)->字符串.我不写该函数的详细信息，因为它可能会更改.

I have a python function f(foo: string) -> string. I don't write the details of the function because it could be change.

我需要从markdown文件中获取所有 链接，并将其替换为该函数的结果.

I need to get all links from markdown file and replace them with the result of that function.

示例:此链接

This is  a text and this [is first link](http://example.com "Example Title") and
 this [is a second](#example) link.

将替换为

This is  a text and this [is first link](result1 "Example Title") and
 this [is a second](result2) link.

其中 f(http://example.com)= result1 和 f(#example)= result2 .即 result1 是 f(http://example.com)的输出，而 result2 是 f(#例如).

where f(http://example.com)=result1 and f(#example)=result2. That is result1 is the output of f(http://example.com) and result2 is the output of f(#example).

我们可以在python正则表达式中或使用某些具有markdown文件特征的特定程序包吗?

Can we do in python regular expressions or with some specific package which traits markdown files?

推荐答案

修改 mreinhart 对此问题的回答，这可能完成:

Modifying mreinhart response to this question, this could be done:

def find_md_links(md):
    """Returns dict of links in markdown:
    'regular': [foo](some.url)
    'footnotes': [foo][3]
    
    [3]: some.url
    """
    # https://stackoverflow.com/a/30738268/2755116

    INLINE_LINK_RE = re.compile(r'\[([^\]]+)\]\(([^)]+)\)')
    FOOTNOTE_LINK_TEXT_RE = re.compile(r'\[([^\]]+)\]\[(\d+)\]')
    FOOTNOTE_LINK_URL_RE = re.compile(r'\[(\d+)\]:\s+(\S+)')

    links = list(INLINE_LINK_RE.findall(md))
    footnote_links = dict(FOOTNOTE_LINK_TEXT_RE.findall(md))
    footnote_urls = dict(FOOTNOTE_LINK_URL_RE.findall(md))

    footnotes_linking = []
        
    for key in footnote_links.keys():
        footnotes_linking.append((footnote_links[key], footnote_urls[footnote_links[key]]))

    return {'regular': links, 'footnotes': footnotes_linking}


def replace_md_links(md, f):
    """Replace links url to f(url)"""
    
    links = find_md_links(md)
    newmd = md

    for r in links['regular']:
        newmd = newmd.replace(r[1], f(r[1]))

    for r in links['footnotes']:
        newmd = newmd.replace(r[1], f(r[1]))
    
    return newmd

f 是一个函数.例如，我使用此函数仅更改 replace_md_links

f is a function. For example, I use this function which only changes links which belong from # in replace_md_links

def mychange(s, prefix="/static/entrades/", suffix=".md.html"):
    """Change links from tiddlywiki syntax [foo](#something) to [foo](prefix + something + suffix)"""
    
    if s.startswith('#'):
        return prefix + slugify.slugify(urllib.parse.unquote( s.replace('#', '', 1) )) + suffix
    else:
        return s

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