94 lines
2.7 KiB
Python
94 lines
2.7 KiB
Python
# Copyright (c) 2012 Paul Tagliamonte <paultag@debian.org>
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the "Software"),
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# to deal in the Software without restriction, including without limitation
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# the rights to use, copy, modify, merge, publish, distribute, sublicense,
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# and/or sell copies of the Software, and to permit persons to whom the
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# Software is furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# 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, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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# DEALINGS IN THE SOFTWARE.
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from hy.macros import macro
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from hy.models.expression import HyExpression
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from hy.models.symbol import HySymbol
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from hy.models.list import HyList
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@macro("defn")
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def defn_macro(tree):
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return HyExpression([HySymbol("def"),
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tree[1], HyExpression([HySymbol("fn")] + tree[2:])])
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@macro("cond")
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def cond_macro(tree):
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tree.pop(0) # cond flag
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it = iter(tree)
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conds = iter(zip(it, it))
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test, branch = next(conds)
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root = HyExpression([HySymbol("if"), test, branch])
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ret = root
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for (test, branch) in conds:
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n = HyExpression([HySymbol("if"), test, branch])
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ret.append(n)
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ret = n
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return root
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@macro("for")
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def for_macro(tree):
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tree.pop(0)
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ret = None
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# for [x iter y iter] ...
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# ->
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# foreach x iter
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# foreach y iter
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# ...
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it = iter(tree.pop(0))
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blocks = list(zip(it, it)) # List for Python 3.x degenerating.
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key, val = blocks.pop(0)
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ret = HyExpression([HySymbol("foreach"),
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HyList([key, val])])
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root = ret
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ret.replace(tree)
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for key, val in blocks:
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# x, [1, 2, 3, 4]
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nret = HyExpression([HySymbol("foreach"),
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HyList([key, val])])
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nret.replace(key)
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ret.append(nret)
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ret = nret
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[ret.append(x) for x in tree] # we really need ~@
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return root
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@macro("_>")
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def threading_macro(tree):
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tree.pop(0)
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ret = tree.pop(0)
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for node in tree:
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if not isinstance(node, HyExpression):
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nnode = HyExpression([node])
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nnode.replace(node)
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node = nnode
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node.insert(1, ret)
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ret = node
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return ret
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