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[jsinterp] Minimally handle arithmetic operator precedence
Resolves #32066
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@ -505,6 +505,17 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('function x(){return 1236566549 << 5}')
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self.assertEqual(jsi.call_function('x'), 915423904)
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def test_32066(self):
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jsi = JSInterpreter("function x(){return Math.pow(3, 5) + new Date('1970-01-01T08:01:42.000+08:00') / 1000 * -239 - -24205;}")
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self.assertEqual(jsi.call_function('x'), 70)
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def test_unary_operators(self):
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jsi = JSInterpreter('function f(){return 2 - - - 2;}')
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self.assertEqual(jsi.call_function('f'), 0)
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# fails
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# jsi = JSInterpreter('function f(){return 2 + - + - - 2;}')
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# self.assertEqual(jsi.call_function('f'), 0)
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""" # fails so far
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def test_packed(self):
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jsi = JSInterpreter('''function x(p,a,c,k,e,d){while(c--)if(k[c])p=p.replace(new RegExp('\\b'+c.toString(a)+'\\b','g'),k[c]);return p}''')
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@ -1,5 +1,6 @@
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from __future__ import unicode_literals
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from functools import update_wrapper
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import itertools
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import json
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import math
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@ -23,11 +24,23 @@ from .compat import (
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)
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def wraps_op(op):
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def update_and_rename_wrapper(w):
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f = update_wrapper(w, op)
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# fn names are str in both Py 2/3
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f.__name__ = str('JS_') + f.__name__
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return f
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return update_and_rename_wrapper
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def _js_bit_op(op):
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def zeroise(x):
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return 0 if x in (None, JS_Undefined) else x
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@wraps_op(op)
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def wrapped(a, b):
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return op(zeroise(a), zeroise(b)) & 0xffffffff
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@ -36,6 +49,7 @@ def _js_bit_op(op):
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def _js_arith_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if JS_Undefined in (a, b):
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return float('nan')
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@ -66,6 +80,7 @@ def _js_exp(a, b):
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def _js_eq_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if set((a, b)) <= set((None, JS_Undefined)):
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return op(a, a)
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@ -76,6 +91,7 @@ def _js_eq_op(op):
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def _js_comp_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if JS_Undefined in (a, b):
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return False
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@ -356,6 +372,7 @@ class JSInterpreter(object):
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return right_val
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try:
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# print('Eval:', opfunc.__name__, left_val, right_val)
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return opfunc(left_val, right_val)
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except Exception as e:
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raise self.Exception('Failed to evaluate {left_val!r:.50} {op} {right_val!r:.50}'.format(**locals()), expr, cause=e)
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@ -395,6 +412,7 @@ class JSInterpreter(object):
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raise self.Exception('Recursion limit reached')
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allow_recursion -= 1
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# print('At: ' + stmt[:60])
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should_return = False
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# fails on (eg) if (...) stmt1; else stmt2;
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sub_statements = list(self._separate(stmt, ';')) or ['']
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@ -702,9 +720,24 @@ class JSInterpreter(object):
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continue
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right_expr = separated.pop()
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while op == '-' and len(separated) > 1 and not separated[-1].strip():
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right_expr = '-' + right_expr
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separated.pop()
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# handle operators that are both unary and binary, minimal BODMAS
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if op in ('+', '-'):
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undone = 0
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while len(separated) > 1 and not separated[-1].strip():
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undone += 1
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separated.pop()
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if op == '-' and undone % 2 != 0:
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right_expr = op + right_expr
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left_val = separated[-1]
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for dm_op in ('*', '%', '/', '**'):
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bodmas = tuple(self._separate(left_val, dm_op, skip_delims=skip_delim))
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if len(bodmas) > 1 and not bodmas[-1].strip():
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expr = op.join(separated) + op + right_expr
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right_expr = None
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break
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if right_expr is None:
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continue
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left_val = self.interpret_expression(op.join(separated), local_vars, allow_recursion)
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return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion), should_return
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@ -955,6 +988,7 @@ class JSInterpreter(object):
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def build_function(self, argnames, code, *global_stack):
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global_stack = list(global_stack) or [{}]
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argnames = tuple(argnames)
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# import pdb; pdb.set_trace()
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def resf(args, kwargs={}, allow_recursion=100):
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global_stack[0].update(
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