bottle.py中的路由解析代码

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# Routing def compile_route(route):     """ Compiles a route string and returns a precompiled RegexObject.       Routes may contain regular expressions with named groups to support url parameters.     Example:       '/user/(?P<id>[0-9]+)' will match '/user/5' with {'id':'5'}       A more human readable syntax is supported too.     Example:       '/user/:id/:action' will match '/user/5/kiss' with {'id':'5', 'action':'kiss'}       Placeholders match everything up to the next slash.       '/user/:id#[0-9]+#' will match '/user/5' but not '/user/tim'       Instead of "#" you can use any single special char other than "/"     """     route = route.strip().lstrip('$^/ ').rstrip('$^ ')     # 将 /user/:id#[0-9]+#/ 转换为 /user/(?P<id>[0-9]+)/     route = re.sub(r':([a-zA-Z_]+)(?P<uniq>[^\w/])(?P<re>.+?)(?P=uniq)',r'(?P<\1>\g<re>)',route)     # 将 /user/:id/ 转换为 /user/(?P<id>[^/]+)/     route = re.sub(r':([a-zA-Z_]+)',r'(?P<\1>[^/]+)', route)     return re.compile('^/%s$' % route)