def stringToExpression(s, types, context):
"""Given a string, convert it to a tree of ExpressionNode's.
"""
old_ctx = expressions._context.get_current_context()
try:
expressions._context.set_new_context(context)
# first compile to a code object to determine the names
c = compile(s, '<expr>', 'eval')
# make VariableNode's for the names
names = {}
for name in c.co_names:
if name == "None":
names[name] = None
elif name == "True":
names[name] = True
elif name == "False":
names[name] = False
else:
t = types.get(name, default_type)
names[name] = expressions.VariableNode(name, type_to_kind[t])
names.update(expressions.functions)
# now build the expression
ex = eval(c, names)
if expressions.isConstant(ex):
ex = expressions.ConstantNode(ex, expressions.getKind(ex))
elif not isinstance(ex, expressions.ExpressionNode):
raise TypeError("unsupported expression type: %s" % type(ex))
finally:
expressions._context.set_new_context(old_ctx)
return ex
def stringToExpression(s, types, context):
"""Given a string, convert it to a tree of ExpressionNode's.
"""
old_ctx = expressions._context.get_current_context()
try:
expressions._context.set_new_context(context)
# first compile to a code object to determine the names
if context.get('truediv', False):
flags = __future__.division.compiler_flag
else:
flags = 0
c = compile(s, '<expr>', 'eval', flags)
# make VariableNode's for the names
names = {}
for name in c.co_names:
if name == "None":
names[name] = None
elif name == "True":
names[name] = True
elif name == "False":
names[name] = False
else:
t = types.get(name, default_type)
names[name] = expressions.VariableNode(name, type_to_kind[t])
names.update(expressions.functions)
# now build the expression
ex = eval(c, names)
if expressions.isConstant(ex):
ex = expressions.ConstantNode(ex, expressions.getKind(ex))
elif not isinstance(ex, expressions.ExpressionNode):
raise TypeError("unsupported expression type: %s" % type(ex))
finally:
expressions._context.set_new_context(old_ctx)
return ex
