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diff --git a/Models/Feynrules/python/ufo2peg/converter.py b/Models/Feynrules/python/ufo2peg/converter.py
--- a/Models/Feynrules/python/ufo2peg/converter.py
+++ b/Models/Feynrules/python/ufo2peg/converter.py
@@ -1,162 +1,163 @@
"""
AST visitor class to convert Python expressions into C++ as used by ThePEG
"""
import ast
def py2cpp(expr):
"""Convert expr to C++ form. Wraps the converter class."""
result = PyToCpp().parse(expr)
return result
class PyToCppException(Exception):
"""Base class for all PyToCpp exceptions."""
class PyToCpp(ast.NodeVisitor):
"""Convert Python math expressions into C++.
Returns a tuple (expr,syms):
expr -- C++-compatible expression
syms -- set of all free variables
Usage:
>>> expr = '3+2**a*b'
>>> PyToCpp().parse(expr)
('(3.0+(pow(2.0,a)*b))', set(['a', 'b']))
Note:
The converter is currently not generic, it relies on the
conventions of Feynrules' UFO format on the one hand and ThePEG's
C++ types on the other.
"""
def parse(self,expression):
"""Convert expression to C++ format."""
self.result = []
self.symbols = set()
+ expression=expression.replace("abs(","cmath.abs(")
tree = ast.parse(expression)
#print ast.dump(tree)
return self.visit(tree)
##################################
def visit_Module(self,node):
self.generic_visit(node)
return ''.join(self.result), self.symbols
def generic_visit(self,node):
typename = type(node).__name__
harmless = ['Module','Expr']
if typename not in harmless:
raise PyToCppException('Missing implementation for %s' % typename)
super(PyToCpp,self).generic_visit(node)
def visit_UnaryOp(self,node):
self.result.append('(')
self.visit(node.op)
self.visit(node.operand)
self.result.append(')')
def visit_BinOp(self,node):
if type(node.op) == type(ast.Pow()):
return self.pow_node(node)
self.result.append('(')
self.visit(node.left)
self.visit(node.op)
self.visit(node.right)
self.result.append(')')
def pow_node(self,node):
if is_square(node):
self.result.append('sqr(')
self.visit(node.left)
self.result.append(')')
else:
self.result.append('pow(')
self.visit(node.left)
self.result.append(',')
self.visit(node.right)
self.result.append(')')
def visit_Call(self,node):
if is_ii(node):
self.result.append('ii')
else:
self.visit(node.func)
self.result.append('(')
for a in node.args:
self.visit(a)
self.result.append(',')
if self.result[-1] == ',':
del self.result[-1]
self.result.append(')')
def visit_Attribute(self,node):
if node.value.id != 'cmath':
err = "Don't know how to convert %s module." % node.value.id
raise PyToCppException(err)
self.result.append(node.attr)
def visit_Num(self,node):
# some zeros are encoded as 0j
if node.n == 0: text = '0.0'
else: text = str(float(node.n))
self.result.append(text)
def visit_Name(self,node):
text = str(node.id)
if text == 'complex':
text = 'Complex'
elif text == 'complexconjugate':
text = 'conj'
elif text not in []:
self.symbols.add(text)
self.result.append(text)
def visit_Mult(self,node):
self.result.append('*')
def visit_Add(self,node):
self.result.append('+')
def visit_Sub(self,node):
self.result.append('-')
def visit_USub(self,node):
self.result.append('-')
def visit_UAdd(self,node):
self.result.append('+')
def visit_Div(self,node):
self.result.append('/')
def visit_Pow(self,node):
err = "Shold never get here. BinaryOp catches Pow calls."
raise PyToCppException(err)
### Helpers
def is_square(node):
"""Check if a Pow object is just a square."""
try:
return node.right.n == 2.0
except:
return False
def is_ii(node):
"""Check if a Call object is just the imaginary unit."""
try:
return ( node.func.id == 'complex'
and node.args[0].n == 0
and node.args[1].n == 1 )
except:
return False
if __name__ == "__main__":
import doctest
doctest.testmod()

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