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Fix boolean semantics so that the empty string evaluates to false, and

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numeric strings are false if their numeric values are false.
This commit is contained in:
andy
2005-03-30 18:45:01 +00:00
parent 405a455906
commit cf056bace7
1 changed files with 8 additions and 3 deletions
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simgear/nasal/code.c
+8 -3
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@@ -27,11 +27,16 @@ void naRuntimeError(struct Context* c, char* msg)
longjmp(c->jumpHandle, 1); longjmp(c->jumpHandle, 1);
} }
int boolify(struct Context* ctx, naRef r) static int boolify(struct Context* ctx, naRef r)
{ {
if(IS_NIL(r)) return 0;
if(IS_NUM(r)) return r.num != 0; if(IS_NUM(r)) return r.num != 0;
if(IS_STR(r)) return 1; if(IS_NIL(r)) return 0;
if(IS_STR(r)) {
double d;
if(naStr_len(r) == 0) return 0;
if(naStr_tonum(r, &d)) return d != 0;
else return 1;
}
ERR(ctx, "non-scalar used in boolean context"); ERR(ctx, "non-scalar used in boolean context");
return 0; return 0;
} }