pathlib2.py 文件源码

def parse_parts(self, parts):
        if six.PY2:
            parts = _py2_fsencode(parts)
        parsed = []
        sep = self.sep
        altsep = self.altsep
        drv = root = ''
        it = reversed(parts)
        for part in it:
            if not part:
                continue
            if altsep:
                part = part.replace(altsep, sep)
            drv, root, rel = self.splitroot(part)
            if sep in rel:
                for x in reversed(rel.split(sep)):
                    if x and x != '.':
                        parsed.append(intern(x))
            else:
                if rel and rel != '.':
                    parsed.append(intern(rel))
            if drv or root:
                if not drv:
                    # If no drive is present, try to find one in the previous
                    # parts. This makes the result of parsing e.g.
                    # ("C:", "/", "a") reasonably intuitive.
                    for part in it:
                        if not part:
                            continue
                        if altsep:
                            part = part.replace(altsep, sep)
                        drv = self.splitroot(part)[0]
                        if drv:
                            break
                break
        if drv or root:
            parsed.append(drv + root)
        parsed.reverse()
        return drv, root, parsed