sfan5
/
minetestbot-modules
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[Calc] Use eval() because I do not want to write a python parser

master
Sfan5 2014-01-23 21:42:27 +01:00
parent 899d3e9c67
commit 6b0541bf03
1 changed files with 16 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
calc.py
View File

@ -10,67 +10,23 @@ import operator as op
import math
import random
# http://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string/9558001#9558001
operators = {
ast.Add: op.add, ast.Sub: op.sub, ast.Mult: op.mul, ast.Pow: op.pow,
ast.Div: op.truediv, ast.BitXor: op.xor, ast.Mod: op.mod
}
funcs = {
env = {
"bin": bin, "abs": abs, "oct": oct, "int": int, "sum": sum,
"tuple": tuple, "divmod": divmod, "hash": hash, "hex": hex,
"len": len, "list": list, "long": long, "max": max,
"range": range, "round": round, "min": min, "map": map,
# random functions
"betavariate": random.betavariate, "choice": random.choice,
"expovariate": random.expovariate, "gammavariate": random.gammavariate,
"gauss": random.gauss, "getrandbits": random.getrandbits,
"lognormvariate": random.lognormvariate, "normalvariate": random.normalvariate,
"paretovariate": random.paretovariate, "randint": random.randint,
"random": random.random, "randrange": random.randrange,
"sample": random.sample, "shuffle": random.shuffle,
"triangular": random.triangular, "uniform": random.uniform,
"vonmisesvariate": random.vonmisesvariate, "weibullvariate": random.weibullvariate
"range": range, "round": round, "min": min, "map": map
}
for funcn in dir(math):
if funcn.startswith("_"):
continue
funcs[funcn] = getattr(math, funcn)
libs = [
'math', 'random'
]
def getfunc(fn):
if fn in funcs:
return funcs[fn]
else:
raise ValueError("Function not known: '" + str(fn) + "'")
def get_kwargs(kwrds):
kwargs = {}
for kw in kwrds:
kwargs[kw.arg] = eval_astnode(kw.value)
return kwargs
def eval_strexpr(expr):
return eval_astnode(ast.parse(expr).body[0].value) # Module(body=[Expr(value=...)])
def eval_astnode(node):
if isinstance(node, ast.Num): # <number>
return node.n
elif isinstance(node, ast.operator): # <operator>
return operators[type(node)]
elif isinstance(node, ast.BinOp): # <left> <operator> <right>
return eval_astnode(node.op)(eval_astnode(node.left), eval_astnode(node.right))
elif isinstance(node, ast.Call): # <func> ( <args> )
return getfunc(node.func.id)(*(eval_astnode(e) for e in node.args), **get_kwargs(node.keywords))
elif isinstance(node, ast.Tuple): # ( <elem> , <elem2> , [...] )
return tuple(eval_astnode(e) for e in node.elts)
elif isinstance(node, ast.List): # [ <elem> , <elem2> , [...] ]
return list(eval_astnode(e) for e in node.elts)
elif isinstance(node, ast.Str): # ('|") <text> ('|")
return node.s
else:
raise TypeError("AST node type not allowed: '" + type(node).__name__ + "'")
for lib in libs:
env[lib] = {}
for funcn in dir(globals()[lib]):
if funcn.startswith("_"):
continue
env[lib][funcn] = getattr(globals()[lib], funcn)
def c(phenny, input):
for x in phenny.bot.commands["high"].values():
@ -79,12 +35,14 @@ def c(phenny, input):
return # Abort function
if not input.group(2):
return phenny.reply("Nothing to calculate.")
q = input.group(2).encode('utf-8')
q = input.group(2).encode('ascii', 'ignore')
if '__' in q:
phenny.reply("Sorry, but no double underscores.")
print("[LOG]: %s calculated '%s'" % (input.nick, q))
try:
phenny.say(repr(eval_strexpr(q)))
phenny.say(repr(eval(q, {'__builtins__': env}, {})))
except Exception as e:
phenny.say("Exception: " + str(e))
phenny.say(type(e).__name__ + ": " + str(e))
c.commands = ['c']
c.example = '.c 5 + 3'