110 lines
3.6 KiB
Python
110 lines
3.6 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.errors import HyError
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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.string import HyString
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import ast
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class HyCompileError(HyError):
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pass
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_compile_table = {}
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def builds(_type):
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def _dec(fn):
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_compile_table[_type] = fn
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def shim(*args, **kwargs):
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return fn(*args, **kwargs)
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return shim
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return _dec
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class HyASTCompiler(object):
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def __init__(self):
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self.returnable = False
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def compile(self, tree):
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for _type in _compile_table:
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if type(tree) == _type:
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return _compile_table[_type](self, tree)
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raise HyCompileError("Unknown type - `%s'" % (str(type(tree))))
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def _mangle_branch(self, tree):
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ret = []
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tree.reverse()
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if self.returnable:
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el = tree.pop()
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if not isinstance(el, ast.stmt):
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ret.append(ast.Return(value=el,
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lineno=el.lineno,
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col_offset=el.col_offset))
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ret += [
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ast.Expr(value=el,
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lineno=el.lineno,
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col_offset=el.col_offset)
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if not isinstance(el, ast.stmt) else el for el in tree # NOQA
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] # for some stupid reason, flake8 thinks i'm redefining. ^^^^
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ret.reverse()
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return ret
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@builds(list)
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def compile_raw_list(self, entries):
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return [self.compile(x) for x in entries]
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@builds(HyExpression)
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def compile_expression(self, expression):
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return ast.Call(func=self.compile_symbol(expression[0]),
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args=[self.compile(x) for x in expression[1:]],
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keywords=[],
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starargs=None,
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kwargs=None,
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lineno=expression.start_line,
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col_offset=expression.start_column)
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@builds(HySymbol)
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def compile_symbol(self, symbol):
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return ast.Name(id=str(symbol), ctx=ast.Load(),
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lineno=symbol.start_line,
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col_offset=symbol.start_column)
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@builds(HyString)
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def compile_string(self, string):
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return ast.Str(s=str(string), lineno=string.start_line,
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col_offset=string.start_column)
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def hy_compile(tree):
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" Compile a HyObject tree into a Python AST tree. "
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compiler = HyASTCompiler()
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ret = ast.Module(body=compiler._mangle_branch(compiler.compile(tree)))
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return ret
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