50 lines
1.9 KiB
Python
50 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2008/2013 Andrey Vlasovskikh
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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def pretty_tree(x, kids, show):
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"""(a, (a -> list(a)), (a -> str)) -> str
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Returns a pseudographic tree representation of x similar to the tree command
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in Unix.
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"""
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(MID, END, CONT, LAST, ROOT) = ('|-- ', '`-- ', '| ', ' ', '')
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def rec(x, indent, sym):
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line = indent + sym + show(x)
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xs = kids(x)
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if len(xs) == 0:
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return line
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else:
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if sym == MID:
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next_indent = indent + CONT
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elif sym == ROOT:
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next_indent = indent + ROOT
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else:
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next_indent = indent + LAST
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syms = [MID] * (len(xs) - 1) + [END]
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lines = [rec(x, next_indent, sym) for x, sym in zip(xs, syms)]
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return '\n'.join([line] + lines)
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return rec(x, '', ROOT)
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