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optimized and fixed JS_AtomIsNumericIndex1(): 'NaN' is also a number

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Fabrice Bellard
2025-04-16 15:04:57 +02:00
parent 3b04c58628
commit 0c5d59f6a9
4 changed files with 23 additions and 48 deletions
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64
quickjs.c
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@@ -3088,7 +3088,7 @@ static JSValue JS_AtomIsNumericIndex1(JSContext *ctx, JSAtom atom)
JSRuntime *rt = ctx->rt;
JSAtomStruct *p1;
JSString *p;
int c, len, ret;
int c, ret;
JSValue num, str;
if (__JS_AtomIsTaggedInt(atom))
@@ -3097,52 +3097,24 @@ static JSValue JS_AtomIsNumericIndex1(JSContext *ctx, JSAtom atom)
p1 = rt->atom_array[atom];
if (p1->atom_type != JS_ATOM_TYPE_STRING)
return JS_UNDEFINED;
p = p1;
len = p->len;
if (p->is_wide_char) {
const uint16_t *r = p->u.str16, *r_end = p->u.str16 + len;
if (r >= r_end)
return JS_UNDEFINED;
c = *r;
if (c == '-') {
if (r >= r_end)
return JS_UNDEFINED;
r++;
c = *r;
/* -0 case is specific */
if (c == '0' && len == 2)
goto minus_zero;
}
/* XXX: should test NaN, but the tests do not check it */
if (!is_num(c)) {
/* XXX: String should be normalized, therefore 8-bit only */
const uint16_t nfinity16[7] = { 'n', 'f', 'i', 'n', 'i', 't', 'y' };
if (!(c =='I' && (r_end - r) == 8 &&
!memcmp(r + 1, nfinity16, sizeof(nfinity16))))
return JS_UNDEFINED;
}
} else {
const uint8_t *r = p->u.str8, *r_end = p->u.str8 + len;
if (r >= r_end)
return JS_UNDEFINED;
c = *r;
if (c == '-') {
if (r >= r_end)
return JS_UNDEFINED;
r++;
c = *r;
/* -0 case is specific */
if (c == '0' && len == 2) {
minus_zero:
return __JS_NewFloat64(ctx, -0.0);
}
}
if (!is_num(c)) {
if (!(c =='I' && (r_end - r) == 8 &&
!memcmp(r + 1, "nfinity", 7)))
return JS_UNDEFINED;
}
switch(atom) {
case JS_ATOM_minus_zero:
return __JS_NewFloat64(ctx, -0.0);
case JS_ATOM_Infinity:
return __JS_NewFloat64(ctx, INFINITY);
case JS_ATOM_minus_Infinity:
return __JS_NewFloat64(ctx, -INFINITY);
case JS_ATOM_NaN:
return __JS_NewFloat64(ctx, NAN);
default:
break;
}
p = p1;
if (p->len == 0)
return JS_UNDEFINED;
c = string_get(p, 0);
if (!is_num(c) && c != '-')
return JS_UNDEFINED;
/* this is ECMA CanonicalNumericIndexString primitive */
num = JS_ToNumber(ctx, JS_MKPTR(JS_TAG_STRING, p));
if (JS_IsException(num))