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import ast
import operator as op
operators = {
ast.Add: op.add,
ast.Sub: op.sub,
ast.Mult: op.mul,
ast.Div: op.truediv,
ast.FloorDiv: op.floordiv,
ast.Pow: op.pow,
ast.BitXor: op.xor,
ast.USub: op.neg,
ast.Mod: op.mod
}
class MathExpression:
@classmethod
def INPUT_TYPES(cls):
return {
"required": {
"expression": ("STRING", {"multiline": True, "dynamicPrompts": False}),
},
"optional": {
"a": ("FLOAT", {"forceInput": True}),
"b": ("FLOAT", {"forceInput": True}),
"c": ("FLOAT", {"forceInput": True}),
},
"hidden": {"extra_pnginfo": "EXTRA_PNGINFO",
"prompt": "PROMPT"},
}
RETURN_TYPES = ("INT", "FLOAT", "STRING", )
FUNCTION = "evaluate"
CATEGORY = "utils"
def get_widget_value(self, extra_pnginfo, prompt, node_name, widget_name):
workflow = extra_pnginfo["workflow"]
node_id = None
for node in workflow["nodes"]:
name = node["type"]
if "properties" in node:
if "Node name for S&R" in node["properties"]:
name = node["properties"]["Node name for S&R"]
if name == node_name:
node_id = node["id"]
break
if "title" in node:
name = node["title"]
if name == node_name:
node_id = node["id"]
break
if node_id is not None:
values = prompt[str(node_id)]
if "inputs" in values:
if widget_name in values["inputs"]:
return values["inputs"][widget_name]
raise NameError(f"Widget not found: {node_name}.{widget_name}")
raise NameError(f"Node not found: {node_name}.{widget_name}")
def evaluate(self, expression, extra_pnginfo, prompt, a=None, b=None, c=None):
expression = expression.replace('\n', ' ').replace('\r', '')
node = ast.parse(expression, mode='eval').body
def eval_expr(node):
if isinstance(node, ast.Num):
return node.n
elif isinstance(node, ast.BinOp):
return operators[type(node.op)](eval_expr(node.left), eval_expr(node.right))
elif isinstance(node, ast.UnaryOp):
return operators[type(node.op)](eval_expr(node.operand))
elif isinstance(node, ast.Attribute):
return self.get_widget_value(extra_pnginfo, prompt, node.value.id, node.attr)
elif isinstance(node, ast.Name):
if node.id == "a":
return a
if node.id == "b":
return b
if node.id == "c":
return c
raise NameError(f"Name not found: {node.id}")
else:
raise TypeError(node)
r = eval_expr(node)
return (int(r), float(r), str(r))
NODE_CLASS_MAPPINGS = {
"MathExpression|pysssss": MathExpression,
}
NODE_DISPLAY_NAME_MAPPINGS = {
"MathExpression|pysssss": "Math Expression 🐍",
}
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