76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
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import py
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html = py.xml.html
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def getrelfspath(dotted_name):
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# XXX need to make sure its imported on non-py lib
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return eval(dotted_name, {"py": py})
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class LazyHref(object):
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def __init__(self, linker, linkid):
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self._linker = linker
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self._linkid = linkid
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def __unicode__(self):
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return unicode(self._linker.get_target(self._linkid))
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class Linker(object):
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fromlocation = None
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def __init__(self):
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self._linkid2target = {}
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def get_lazyhref(self, linkid):
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return LazyHref(self, linkid)
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def set_link(self, linkid, target):
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assert (linkid not in self._linkid2target,
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'linkid %r already used' % (linkid,))
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self._linkid2target[linkid] = target
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def get_target(self, linkid):
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linktarget = self._linkid2target[linkid]
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if self.fromlocation is not None:
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linktarget = relpath(self.fromlocation, linktarget)
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return linktarget
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def call_withbase(self, base, func, *args, **kwargs):
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assert self.fromlocation is None
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self.fromlocation = base
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try:
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return func(*args, **kwargs)
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finally:
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del self.fromlocation
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def relpath(p1, p2, sep='/', back='..'):
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if (p1.startswith(sep) ^ p2.startswith(sep)):
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raise ValueError("mixed absolute relative path: %r -> %r" %(p1, p2))
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fromlist = p1.split(sep)
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tolist = p2.split(sep)
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# AA
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# AA BB -> AA/BB
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#
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# AA BB
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# AA CC -> CC
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#
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# AA BB
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# AA -> ../AA
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diffindex = 0
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for x1, x2 in zip(fromlist, tolist):
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if x1 != x2:
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break
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diffindex += 1
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commonindex = diffindex - 1
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fromlist_diff = fromlist[diffindex:]
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tolist_diff = tolist[diffindex:]
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if not fromlist_diff:
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return sep.join(tolist[commonindex:])
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backcount = len(fromlist_diff)
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if tolist_diff:
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return sep.join([back,]*(backcount-1) + tolist_diff)
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return sep.join([back,]*(backcount) + tolist[commonindex:])
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