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import ast |
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3
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4
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symbols = { |
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ast.Eq: "==", |
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ast.NotEq: '!=', |
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ast.Pass: '/*pass*/', |
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ast.Mult: '*', |
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ast.Add: '+', |
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ast.Sub: '-', |
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ast.Div: '/', |
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ast.FloorDiv: '/', |
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ast.Mod: '%', |
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ast.Lt: '<', |
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ast.Gt: '>', |
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ast.GtE: '>=', |
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ast.LtE: '<=', |
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ast.LShift: '<<', |
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ast.RShift: '>>', |
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ast.BitXor: '^', |
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ast.BitOr: '|', |
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ast.BitAnd: '&', |
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ast.Not: '!', |
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ast.IsNot: '!=', |
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ast.USub: '-', |
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ast.And: '&&', |
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ast.Or: '||' |
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} |
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def c_symbol(node): |
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"""Find the equivalent C symbol for a Python ast symbol node""" |
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symbol_type = type(node) |
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return symbols[symbol_type] |
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36
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class CLikeTranspiler(ast.NodeVisitor): |
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builtin_constants = frozenset(['True', 'False', 'None']) |
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"""Provides a base for C-like programming languages""" |
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def visit(self, node): |
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if type(node) in symbols: |
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return c_symbol(node) |
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else: |
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return super(CLikeTranspiler, self).visit(node) |
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def visit_Name(self, node): |
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if node.id in self.builtin_constants: |
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return node.id.lower() |
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return node.id |
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def visit_Num(self, node): |
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return str(node.n) |
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54
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def visit_Str(self, node): |
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return '"{0}"'.format(node.s) |
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def visit_Return(self, node): |
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if node.value: |
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return 'return {0};'.format(self.visit(node.value)) |
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return 'return;' |
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def visit_If(self, node): |
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buf = [] |
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buf.append('if({0}) {{'.format(self.visit(node.test))) |
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buf.extend([self.visit(child) for child in node.body]) |
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orelse = [self.visit(child) for child in node.orelse] |
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if orelse: |
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buf.append('} else {') |
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buf.extend(orelse) |
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buf.append("}") |
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else: |
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buf.append('}') |
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return '\n'.join(buf) |
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def visit_While(self, node): |
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buf = [] |
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buf.append("while ({0}) {{".format(self.visit(node.test))) |
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buf.extend([self.visit(n) for n in node.body]) |
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buf.append("}") |
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return '\n'.join(buf) |
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84
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def visit_Compare(self, node): |
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left = self.visit(node.left) |
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op = self.visit(node.ops[0]) |
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right = self.visit(node.comparators[0]) |
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return "{0} {1} {2}".format(left, op, right) |
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90
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def visit_BoolOp(self, node): |
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op = self.visit(node.op) |
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return op.join([self.visit(v) for v in node.values]) |
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94
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def visit_BinOp(self, node): |
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if isinstance(node.op, ast.Pow): |
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return "std::pow({0}, {1})".format(self.visit(node.left), |
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self.visit(node.right)) |
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return " ".join([self.visit(node.left), |
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self.visit(node.op), |
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self.visit(node.right)]) |
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103
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def visit_AugAssign(self, node): |
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target = self.visit(node.target) |
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op = self.visit(node.op) |
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val = self.visit(node.value) |
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return "{0} {1}= {2};".format(target, op, val) |
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lukasmartinelli /
py14
