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Fix an infinite recursion by disallowing forward globals in global var defs.

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Sei Lisa 2014-07-27 18:42:55 +02:00
parent 716374eb83
commit f3339b0906
2 changed files with 11 additions and 3 deletions
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9
lslopt/lslparse.py
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@ -186,6 +186,8 @@ class parser(object):
# return (symtab[symbol][1], symtab[symbol][3])
return symtab[symbol][1]
scope = symtab[-1]
if self.globalmode and symbol not in self.symtab[0]:
return None # Disallow forwards in global var mode
if symbol not in self.globals:
return None
return self.globals[symbol]
@ -1464,7 +1466,9 @@ class parser(object):
if self.tok[0] == '=':
self.NextToken()
if self.extendedglobalexpr:
self.globalmode = True # Var def. Disallow forward globals.
value = tuple(self.Parse_expression()) # Use advanced expression evaluation.
self.globalmode = False # Allow forward globals again.
else:
value = self.Parse_simple_expr() # Use LSL's dull global expression.
self.expect(';')
@ -1713,6 +1717,11 @@ class parser(object):
self.dictorder = 0
# This is a small hack to prevent circular definitions in globals when
# extended expressions are enabled. When false (default), forward
# globals are allowed; if true, only already seen globals are permitted.
self.globalmode = False
# Globals and labels can be referenced before they are defined. That
# includes states.
#