Example #1
0
/*
 * Perl-inspired push, pop, shift, unshift, and splice methods.
 */
static JSBool
array_push(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    jsuint length;
    uintN i;
    jsid id;

    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;
    for (i = 0; i < argc; i++) {
        if (!IndexToId(cx, length + i, &id))
            return JS_FALSE;
        if (!OBJ_SET_PROPERTY(cx, obj, id, &argv[i]))
            return JS_FALSE;
    }

    /*
     * If JS1.2, follow Perl4 by returning the last thing pushed.  Otherwise,
     * return the new array length.
     */
    length += argc;
    if (cx->version == JSVERSION_1_2) {
        *rval = argc ? argv[argc-1] : JSVAL_VOID;
    } else {
        if (!IndexToValue(cx, length, rval))
            return JS_FALSE;
    }
    return js_SetLengthProperty(cx, obj, length);
}
Example #2
0
static JSBool
array_slice(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    JSObject *nobj;
    jsuint length, begin, end, slot;
    jsdouble d;
    jsid id, id2;
    jsval v;

    nobj = js_NewArrayObject(cx, 0, NULL);
    if (!nobj)
        return JS_FALSE;

    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;
    begin = 0;
    end = length;

    if (argc > 0) {
        if (!js_ValueToNumber(cx, argv[0], &d))
            return JS_FALSE;
        d = js_DoubleToInteger(d);
        if (d < 0) {
            d += length;
            if (d < 0)
                d = 0;
        } else if (d > length) {
            d = length;
        }
        begin = (jsuint)d;

        if (argc > 1) {
            if (!js_ValueToNumber(cx, argv[1], &d))
                return JS_FALSE;
            d = js_DoubleToInteger(d);
            if (d < 0) {
                d += length;
                if (d < 0)
                    d = 0;
            } else if (d > length) {
                d = length;
            }
            end = (jsuint)d;
        }
    }

    for (slot = begin; slot < end; slot++) {
        if (!IndexToId(cx, slot, &id))
            return JS_FALSE;
        if (!IndexToId(cx, slot - begin, &id2))
            return JS_FALSE;
        if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
            return JS_FALSE;
        if (!OBJ_SET_PROPERTY(cx, nobj, id2, &v))
            return JS_FALSE;
    }
    *rval = OBJECT_TO_JSVAL(nobj);
    return JS_TRUE;
}
Example #3
0
static JSBool
array_unshift(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
              jsval *rval)
{
    jsuint length, last;
    uintN i;
    jsid id, id2;
    jsval v;
#if JS_HAS_SPARSE_ARRAYS
    JSObject *obj2;
    JSProperty *prop;
#endif

    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;
    if (argc > 0) {
        /* Slide up the array to make room for argc at the bottom. */
        if (length > 0) {
            last = length;
            while (last--) {
                if (!IndexToId(cx, last, &id))
                    return JS_FALSE;
                if (!IndexToId(cx, last + argc, &id2))
                    return JS_FALSE;
#if JS_HAS_SPARSE_ARRAYS
                if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
                    return JS_FALSE;
                if (!prop) {
                    OBJ_DELETE_PROPERTY(cx, obj, id2, &v); /* v is junk. */
                    continue;
                }
                OBJ_DROP_PROPERTY(cx, obj2, prop);
#endif
                if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
                    return JS_FALSE;
                if (!OBJ_SET_PROPERTY(cx, obj, id2, &v))
                    return JS_FALSE;
            }
        }

        /* Copy from argv to the bottom of the array. */
        for (i = 0; i < argc; i++) {
            if (!IndexToId(cx, i, &id))
                return JS_FALSE;
            if (!OBJ_SET_PROPERTY(cx, obj, id, &argv[i]))
                return JS_FALSE;
        }

        /* Follow Perl by returning the new array length. */
        length += argc;
        if (!js_SetLengthProperty(cx, obj, length))
            return JS_FALSE;
    }
    return IndexToValue(cx, length, rval);
}
Example #4
0
static JSBool
CloseObject(JSContext *cx, JSONParser *jp)
{
    jsuint len;
    if (!js_GetLengthProperty(cx, jp->objectStack, &len))
        return JS_FALSE;
    if (!js_SetLengthProperty(cx, jp->objectStack, len - 1))
        return JS_FALSE;

    return JS_TRUE;
}
Example #5
0
static JSObject *
GetTopOfObjectStack(JSContext *cx, JSONParser *jp)
{
    jsuint length;
    if (!js_GetLengthProperty(cx, jp->objectStack, &length))
        return NULL;
    
    jsval o;
    if (!OBJ_GET_PROPERTY(cx, jp->objectStack, INT_TO_JSID(length - 1), &o))
        return NULL;
    
    JS_ASSERT(!JSVAL_IS_PRIMITIVE(o));
    return JSVAL_TO_OBJECT(o);
}
Example #6
0
static JSBool
array_addProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
    jsuint index, length;

    if (!(IdIsIndex(id, &index)))
        return JS_TRUE;
    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;
    if (index >= length) {
        length = index + 1;
        return js_SetLengthProperty(cx, obj, length);
    }
    return JS_TRUE;
}
Example #7
0
static JSBool
JA(JSContext *cx, jsval *vp, StringifyContext *scx)
{
    JSObject *obj = JSVAL_TO_OBJECT(*vp);

    if (!scx->cb.append('['))
        return JS_FALSE;

    jsuint length;
    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;

    jsval outputValue = JSVAL_NULL;
    JSAutoTempValueRooter tvr(cx, 1, &outputValue);

    jsid id;
    jsuint i;
    for (i = 0; i < length; i++) {
        id = INT_TO_JSID(i);

        if (!obj->getProperty(cx, id, &outputValue))
            return JS_FALSE;

        if (!Str(cx, id, obj, scx, &outputValue))
            return JS_FALSE;

        if (outputValue == JSVAL_VOID) {
            if (!js_AppendLiteral(scx->cb, "null"))
                return JS_FALSE;
        }

        if (i < length - 1) {
            if (!scx->cb.append(','))
                return JS_FALSE;
            if (!WriteIndent(cx, scx, scx->depth))
                return JS_FALSE;
        }
    }

    if (length != 0 && !WriteIndent(cx, scx, scx->depth - 1))
        return JS_FALSE;

    return scx->cb.append(']');
}
Example #8
0
static JSBool
array_reverse(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
              jsval *rval)
{
    jsuint len, half, i;
    jsid id, id2;
    jsval v, v2;

    if (!js_GetLengthProperty(cx, obj, &len))
        return JS_FALSE;

    half = len / 2;
    for (i = 0; i < half; i++) {
        if (!IndexToId(cx, i, &id))
            return JS_FALSE;
        if (!IndexToId(cx, len - i - 1, &id2))
            return JS_FALSE;
        if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
            return JS_FALSE;
        if (!OBJ_GET_PROPERTY(cx, obj, id2, &v2))
            return JS_FALSE;

#if JS_HAS_SPARSE_ARRAYS
        /* This part isn't done yet. */

        if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
            return JS_FALSE;
        if (!prop) {
            OBJ_DELETE_PROPERTY(cx, obj, id2, &v); /* v is junk. */
            continue;
        }
        OBJ_DROP_PROPERTY(cx, obj2, prop);
#endif

        if (!OBJ_SET_PROPERTY(cx, obj, id, &v2))
            return JS_FALSE;
        if (!OBJ_SET_PROPERTY(cx, obj, id2, &v))
            return JS_FALSE;
    }

    *rval = OBJECT_TO_JSVAL(obj);
    return JS_TRUE;
}
Example #9
0
static JSBool
array_convert(JSContext *cx, JSObject *obj, JSType type, jsval *vp)
{
    jsuint length;

    if (cx->version == JSVERSION_1_2) {
        if (!js_GetLengthProperty(cx, obj, &length))
            return JS_FALSE;
        switch (type) {
          case JSTYPE_NUMBER:
            return IndexToValue(cx, length, vp);
          case JSTYPE_BOOLEAN:
            *vp = BOOLEAN_TO_JSVAL(length > 0);
            return JS_TRUE;
          default:
            return JS_TRUE;
        }
    }
    return js_TryValueOf(cx, obj, type, vp);
}
Example #10
0
static JSBool
array_length_setter(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
    jsuint newlen, oldlen, slot;
    jsid id2;
    jsval junk;

    if (!ValueIsLength(cx, *vp, &newlen))
        return JS_FALSE;
    if (!js_GetLengthProperty(cx, obj, &oldlen))
        return JS_FALSE;
    slot = oldlen;
    while (slot > newlen) {
        --slot;
        if (!IndexToId(cx, slot, &id2))
            return JS_FALSE;
        if (!OBJ_DELETE_PROPERTY(cx, obj, id2, &junk))
            return JS_FALSE;
    }
    return IndexToValue(cx, newlen, vp);
}
Example #11
0
static JSBool
PushObject(JSContext *cx, JSONParser *jp, JSObject *obj)
{
    jsuint len;
    if (!js_GetLengthProperty(cx, jp->objectStack, &len))
        return JS_FALSE;
    if (len >= JSON_MAX_DEPTH)
        return JS_FALSE; // decoding error

    jsval v = OBJECT_TO_JSVAL(obj);
    JSAutoTempValueRooter tvr(cx, v);

    // Check if this is the root object
    if (len == 0) {
        *jp->rootVal = v;
        // This property must be enumerable to keep the array dense
        if (!OBJ_DEFINE_PROPERTY(cx, jp->objectStack, INT_TO_JSID(0), *jp->rootVal,
                                 NULL, NULL, JSPROP_ENUMERATE, NULL)) {
            return JS_FALSE;
        }
        return JS_TRUE;
    }

    jsval p;
    if (!OBJ_GET_PROPERTY(cx, jp->objectStack, INT_TO_JSID(len - 1), &p))
        return JS_FALSE;

    JS_ASSERT(JSVAL_IS_OBJECT(p));
    JSObject *parent = JSVAL_TO_OBJECT(p);
    if (!PushValue(cx, jp, parent, OBJECT_TO_JSVAL(obj)))
        return JS_FALSE;

    // This property must be enumerable to keep the array dense
    if (!OBJ_DEFINE_PROPERTY(cx, jp->objectStack, INT_TO_JSID(len), v,
                             NULL, NULL, JSPROP_ENUMERATE, NULL)) {
        return JS_FALSE;
    }

    return JS_TRUE;
}
Example #12
0
static JSBool
array_shift(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    jsuint length, i;
    jsid id, id2;
    jsval v, junk;

    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;
    if (length > 0) {
        length--;
        id = JSVAL_ZERO;

        /* Get the to-be-deleted property's value into rval ASAP. */
        if (!OBJ_GET_PROPERTY(cx, obj, id, rval))
            return JS_FALSE;

        /*
         * Slide down the array above the first element.
         */
        if (length > 0) {
            for (i = 1; i <= length; i++) {
                if (!IndexToId(cx, i, &id))
                    return JS_FALSE;
                if (!IndexToId(cx, i - 1, &id2))
                    return JS_FALSE;
                if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
                    return JS_FALSE;
                if (!OBJ_SET_PROPERTY(cx, obj, id2, &v))
                    return JS_FALSE;
            }
        }

        /* Delete the only or last element. */
        if (!OBJ_DELETE_PROPERTY(cx, obj, id, &junk))
            return JS_FALSE;
    }
    return js_SetLengthProperty(cx, obj, length);
}
Example #13
0
static JSBool
array_pop(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    jsuint index;
    jsid id;
    jsval junk;

    if (!js_GetLengthProperty(cx, obj, &index))
        return JS_FALSE;
    if (index > 0) {
        index--;
        if (!IndexToId(cx, index, &id))
            return JS_FALSE;

        /* Get the to-be-deleted property's value into rval. */
        if (!OBJ_GET_PROPERTY(cx, obj, id, rval))
            return JS_FALSE;

        if (!OBJ_DELETE_PROPERTY(cx, obj, id, &junk))
            return JS_FALSE;
    }
    return js_SetLengthProperty(cx, obj, index);
}
Example #14
0
static JSBool
PushValue(JSContext *cx, JSONParser *jp, JSObject *parent, jsval value)
{
    JSAutoTempValueRooter tvr(cx, 1, &value);
 
    JSBool ok;
    if (OBJ_IS_ARRAY(cx, parent)) {
        jsuint len;
        ok = js_GetLengthProperty(cx, parent, &len);
        if (ok) {
            ok = OBJ_DEFINE_PROPERTY(cx, parent, INT_TO_JSID(len), value,
                                     NULL, NULL, JSPROP_ENUMERATE, NULL);
        }
    } else {
        ok = JS_DefineUCProperty(cx, parent, jp->objectKey->base,
                                 STRING_BUFFER_OFFSET(jp->objectKey), value,
                                 NULL, NULL, JSPROP_ENUMERATE);
        js_FinishStringBuffer(jp->objectKey);
        js_InitStringBuffer(jp->objectKey);
    }

    return ok;
}
Example #15
0
JSBool
js_Stringify(JSContext *cx, jsval *vp, JSObject *replacer,
             JSONWriteCallback callback, void *data, uint32 depth)
{
    if (depth > JSON_MAX_DEPTH)
        return JS_FALSE; /* encoding error */

    JSBool ok = JS_TRUE;
    JSObject *obj = JSVAL_TO_OBJECT(*vp);
    JSBool isArray = JS_IsArrayObject(cx, obj);
    jschar output = jschar(isArray ? '[' : '{');
    if (!callback(&output, 1, data))
        return JS_FALSE;

    JSObject *iterObj = NULL;
    jsint i = 0;
    jsuint length = 0;

    if (isArray) {
        if (!js_GetLengthProperty(cx, obj, &length))
            return JS_FALSE;
    } else {
        if (!js_ValueToIterator(cx, JSITER_ENUMERATE, vp))
            return JS_FALSE;
        iterObj = JSVAL_TO_OBJECT(*vp);
    }

    jsval outputValue = JSVAL_VOID;
    JSAutoTempValueRooter tvr(cx, 1, &outputValue);

    jsval key;
    JSBool memberWritten = JS_FALSE;
    do {
        outputValue = JSVAL_VOID;

        if (isArray) {
            if ((jsuint)i >= length)
                break;
            ok = OBJ_GET_PROPERTY(cx, obj, INT_TO_JSID(i), &outputValue);
            i++;
        } else {
            ok = js_CallIteratorNext(cx, iterObj, &key);
            if (!ok)
                break;
            if (key == JSVAL_HOLE)
                break;

            JSString *ks;
            if (JSVAL_IS_STRING(key)) {
                ks = JSVAL_TO_STRING(key);
            } else {
                ks = js_ValueToString(cx, key);
                if (!ks) {
                    ok = JS_FALSE;
                    break;
                }
            }

            ok = JS_GetUCProperty(cx, obj, JS_GetStringChars(ks),
                                  JS_GetStringLength(ks), &outputValue);
        }

        if (!ok)
            break;

        // if this is an array, holes are transmitted as null
        if (isArray && outputValue == JSVAL_VOID) {
            outputValue = JSVAL_NULL;
        } else if (JSVAL_IS_OBJECT(outputValue)) {
            ok = js_TryJSON(cx, &outputValue);
            if (!ok)
                break;
        }

        // elide undefined values
        if (outputValue == JSVAL_VOID)
            continue;

        // output a comma unless this is the first member to write
        if (memberWritten) {
            output = jschar(',');
            ok = callback(&output, 1, data);
        if (!ok)
                break;
        }
        memberWritten = JS_TRUE;

        JSType type = JS_TypeOfValue(cx, outputValue);

        // Can't encode these types, so drop them
        if (type == JSTYPE_FUNCTION || type == JSTYPE_XML)
            break;

        // Be careful below, this string is weakly rooted.
        JSString *s;

        // If this isn't an array, we need to output a key
        if (!isArray) {
            s = js_ValueToString(cx, key);
            if (!s) {
                ok = JS_FALSE;
                break;
            }

            ok = write_string(cx, callback, data, JS_GetStringChars(s), JS_GetStringLength(s));
            if (!ok)
                break;

            output = jschar(':');
            ok = callback(&output, 1, data);
            if (!ok)
                break;
        }

        if (!JSVAL_IS_PRIMITIVE(outputValue)) {
            // recurse
            ok = js_Stringify(cx, &outputValue, replacer, callback, data, depth + 1);
        } else {
            JSString *outputString;
            s = js_ValueToString(cx, outputValue);
            if (!s) {
                ok = JS_FALSE;
                break;
            }

            if (type == JSTYPE_STRING) {
                ok = write_string(cx, callback, data, JS_GetStringChars(s), JS_GetStringLength(s));
                if (!ok)
                    break;

                continue;
            }

            if (type == JSTYPE_NUMBER) {
                if (JSVAL_IS_DOUBLE(outputValue)) {
                    jsdouble d = *JSVAL_TO_DOUBLE(outputValue);
                    if (!JSDOUBLE_IS_FINITE(d))
                        outputString = JS_NewStringCopyN(cx, "null", 4);
                    else
                        outputString = s;
                } else {
                    outputString = s;
                }
            } else if (type == JSTYPE_BOOLEAN) {
                outputString = s;
            } else if (JSVAL_IS_NULL(outputValue)) {
                outputString = JS_NewStringCopyN(cx, "null", 4);
            } else {
                ok = JS_FALSE; // encoding error
                break;
            }

            if (!outputString) {
                ok = JS_FALSE;
                break;
            }

            ok = callback(JS_GetStringChars(outputString), JS_GetStringLength(outputString), data);
        }
    } while (ok);

    if (iterObj) {
        // Always close the iterator, but make sure not to stomp on OK
        ok &= js_CloseIterator(cx, *vp);
        // encoding error or propagate? FIXME: Bug 408838.
    }

    if (!ok) {
        JS_ReportError(cx, "Error during JSON encoding");
        return JS_FALSE;
    }

    output = jschar(isArray ? ']' : '}');
    ok = callback(&output, 1, data);

    return ok;
}
Example #16
0
static JSBool
array_splice(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    jsuint length, begin, end, count, delta, last;
    uintN i;
    jsdouble d;
    jsid id, id2;
    jsval v;
    JSObject *obj2;

    /* Nothing to do if no args.  Otherwise lock and load length. */
    if (argc == 0)
        return JS_TRUE;
    if (!js_GetLengthProperty(cx, obj, &length))
        return JS_FALSE;

    /* Convert the first argument into a starting index. */
    if (!js_ValueToNumber(cx, *argv, &d))
        return JS_FALSE;
    d = js_DoubleToInteger(d);
    if (d < 0) {
        d += length;
        if (d < 0)
            d = 0;
    } else if (d > length) {
        d = length;
    }
    begin = (jsuint)d; /* d has been clamped to uint32 */
    argc--;
    argv++;

    /* Convert the second argument from a count into a fencepost index. */
    delta = length - begin;
    if (argc == 0) {
        count = delta;
        end = length;
    } else {
        if (!js_ValueToNumber(cx, *argv, &d))
            return JS_FALSE;
        d = js_DoubleToInteger(d);
        if (d < 0)
            d = 0;
        else if (d > delta)
            d = delta;
        count = (jsuint)d;
        end = begin + count;
        argc--;
        argv++;
    }

    if (count == 1 && cx->version == JSVERSION_1_2) {
        /*
         * JS lacks "list context", whereby in Perl one turns the single
         * scalar that's spliced out into an array just by assigning it to
         * @single instead of $single, or by using it as Perl push's first
         * argument, for instance.
         *
         * JS1.2 emulated Perl too closely and returned a non-Array for
         * the single-splice-out case, requiring callers to test and wrap
         * in [] if necessary.  So JS1.3, default, and other versions all
         * return an array of length 1 for uniformity.
         */
        if (!IndexToId(cx, begin, &id))
            return JS_FALSE;
        if (!OBJ_GET_PROPERTY(cx, obj, id, rval))
            return JS_FALSE;
    } else {
        if (cx->version != JSVERSION_1_2 || count > 0) {
            /*
             * Create a new array value to return.  Our ECMA v2 proposal specs
             * that splice always returns an array value, even when given no
             * arguments.  We think this is best because it eliminates the need
             * for callers to do an extra test to handle the empty splice case.
             */
            obj2 = js_NewArrayObject(cx, 0, NULL);
            if (!obj2)
                return JS_FALSE;
            *rval = OBJECT_TO_JSVAL(obj2);

            /* If there are elements to remove, put them into the return value. */
            if (count > 0) {
                for (last = begin; last < end; last++) {
                    if (!IndexToId(cx, last, &id))
                        return JS_FALSE;
                    if (!IndexToId(cx, last - begin, &id2))
                        return JS_FALSE;
                    if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
                        return JS_FALSE;
                    if (!OBJ_SET_PROPERTY(cx, obj2, id2, &v))
                        return JS_FALSE;
                }
            }
        }
    }

    /* Find the direction (up or down) to copy and make way for argv. */
    if (argc > count) {
        delta = (jsuint)argc - count;
        last = length;
        /* (uint) end could be 0, so can't use vanilla >= test */
        while (last-- > end) {
            if (!IndexToId(cx, last, &id))
                return JS_FALSE;
            if (!IndexToId(cx, last + delta, &id2))
                return JS_FALSE;
            if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
                return JS_FALSE;
            if (!OBJ_SET_PROPERTY(cx, obj, id2, &v))
                return JS_FALSE;
        }
        length += delta;
    } else if (argc < count) {
        delta = count - (jsuint)argc;
        for (last = end; last < length; last++) {
            if (!IndexToId(cx, last, &id))
                return JS_FALSE;
            if (!IndexToId(cx, last - delta, &id2))
                return JS_FALSE;
            if (!OBJ_GET_PROPERTY(cx, obj, id, &v))
                return JS_FALSE;
            if (!OBJ_SET_PROPERTY(cx, obj, id2, &v))
                return JS_FALSE;
        }
        length -= delta;
    }

    /* Copy from argv into the hole to complete the splice. */
    for (i = 0; i < argc; i++) {
        if (!IndexToId(cx, begin + i, &id))
            return JS_FALSE;
        if (!OBJ_SET_PROPERTY(cx, obj, id, &argv[i]))
            return JS_FALSE;
    }

    /* Update length in case we deleted elements from the end. */
    return js_SetLengthProperty(cx, obj, length);
}
Example #17
0
/* XXXmccabe do the sort helper functions need to take int?  (Or can we claim
 * that 2^32 * 32 is too large to worry about?)  Something dumps when I change
 * to unsigned int; is qsort using -1 as a fencepost?
 */
static JSBool
array_sort(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
    jsval fval;
    CompareArgs ca;
    jsuint len, newlen, i;
    jsval *vec;
    jsid id;
    size_t nbytes;

    /*
     * Optimize the default compare function case if all of obj's elements
     * have values of type string.
     */
    JSBool all_strings;

    if (argc > 0) {
        if (JSVAL_IS_PRIMITIVE(argv[0])) {
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
                                 JSMSG_BAD_SORT_ARG);
            return JS_FALSE;
        }
        fval = argv[0];
        all_strings = JS_FALSE; /* non-default compare function */
    } else {
        fval = JSVAL_NULL;
        all_strings = JS_TRUE;  /* check for all string values */
    }

    if (!js_GetLengthProperty(cx, obj, &len))
        return JS_FALSE;
    if (len == 0) {
        *rval = OBJECT_TO_JSVAL(obj);
        return JS_TRUE;
    }

    /*
     * Test for size_t overflow, which could lead to indexing beyond the end
     * of the malloc'd vector.
     */
    nbytes = len * sizeof(jsval);
    if (nbytes != (double) len * sizeof(jsval)) {
        JS_ReportOutOfMemory(cx);
        return JS_FALSE;
    }
    vec = (jsval *) JS_malloc(cx, nbytes);
    if (!vec)
        return JS_FALSE;

#if JS_HAS_SPARSE_ARRAYS
    newlen = 0;
#else
    newlen = len;
#endif

    for (i = 0; i < len; i++) {
        ca.status = IndexToId(cx, i, &id);
        if (!ca.status)
            goto out;
#if JS_HAS_SPARSE_ARRAYS
        {
            JSObject *obj2;
            JSProperty *prop;
            ca.status = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
            if (!ca.status)
                goto out;
            if (!prop) {
                vec[i] = JSVAL_VOID;
                continue;
            }
            OBJ_DROP_PROPERTY(cx, obj2, prop);
            newlen++;
        }
#endif
        ca.status = OBJ_GET_PROPERTY(cx, obj, id, &vec[i]);
        if (!ca.status)
            goto out;

        /* We know JSVAL_IS_STRING yields 0 or 1, so avoid a branch via &=. */
        all_strings &= JSVAL_IS_STRING(vec[i]); 
    }

    ca.context = cx;
    ca.fval = fval;
    ca.status = JS_TRUE;
    if (!js_HeapSort(vec, (size_t) len, sizeof(jsval),
                     all_strings ? sort_compare_strings : sort_compare,
                     &ca)) {
        JS_ReportOutOfMemory(cx);
        ca.status = JS_FALSE;
    }

    if (ca.status) {
        ca.status = InitArrayElements(cx, obj, newlen, vec);
        if (ca.status)
            *rval = OBJECT_TO_JSVAL(obj);
#if JS_HAS_SPARSE_ARRAYS
        /* set length of newly-created array object to old length. */
        if (ca.status && newlen < len) {
            ca.status = js_SetLengthProperty(cx, obj, len);

            /* Delete any leftover properties greater than newlen. */
            while (ca.status && newlen < len) {
                jsval junk;

                ca.status = !IndexToId(cx, newlen, &id) ||
                    !OBJ_DELETE_PROPERTY(cx, obj, id, &junk);
                newlen++;
            }
        }
#endif
    }

out:
    if (vec)
        JS_free(cx, vec);
    return ca.status;
}
Example #18
0
static JSBool
array_join_sub(JSContext *cx, JSObject *obj, JSString *sep, JSBool literalize,
               jsval *rval, JSBool localeString)
{
    JSBool ok;
    jsval v;
    jsuint length, index;
    jschar *chars, *ochars;
    size_t nchars, growth, seplen, tmplen;
    const jschar *sepstr;
    JSString *str;
    JSHashEntry *he;
    JSObject *obj2;

    ok = js_GetLengthProperty(cx, obj, &length);
    if (!ok)
        return JS_FALSE;

    he = js_EnterSharpObject(cx, obj, NULL, &chars);
    if (!he)
        return JS_FALSE;
    if (literalize) {
        if (IS_SHARP(he)) {
#if JS_HAS_SHARP_VARS
            nchars = js_strlen(chars);
#else
            chars[0] = '[';
            chars[1] = ']';
            chars[2] = 0;
            nchars = 2;
#endif
            goto make_string;
        }

        /*
         * Allocate 1 + 3 + 1 for "[", the worst-case closing ", ]", and the
         * terminating 0.
         */
        growth = (1 + 3 + 1) * sizeof(jschar);
        if (!chars) {
            nchars = 0;
            chars = (jschar *) malloc(growth);
            if (!chars)
                goto done;
        } else {
            MAKE_SHARP(he);
            nchars = js_strlen(chars);
            chars = (jschar *)
                realloc((ochars = chars), nchars * sizeof(jschar) + growth);
            if (!chars) {
                free(ochars);
                goto done;
            }
        }
        chars[nchars++] = '[';
    } else {
        /*
         * Free any sharp variable definition in chars.  Normally, we would
         * MAKE_SHARP(he) so that only the first sharp variable annotation is
         * a definition, and all the rest are references, but in the current
         * case of (!literalize), we don't need chars at all.
         */
        if (chars)
            JS_free(cx, chars);
        chars = NULL;
        nchars = 0;

        /* Return the empty string on a cycle as well as on empty join. */
        if (IS_BUSY(he) || length == 0) {
            js_LeaveSharpObject(cx, NULL);
            *rval = JS_GetEmptyStringValue(cx);
            return ok;
        }

        /* Flag he as BUSY so we can distinguish a cycle from a join-point. */
        MAKE_BUSY(he);
    }
    sepstr = NULL;
    seplen = JSSTRING_LENGTH(sep);

    v = JSVAL_NULL;
    for (index = 0; index < length; index++) {
        ok = JS_GetElement(cx, obj, index, &v);
        if (!ok)
            goto done;

        if (!literalize && (JSVAL_IS_VOID(v) || JSVAL_IS_NULL(v))) {
            str = cx->runtime->emptyString;
        } else {
            if (localeString) {
                if (!js_ValueToObject(cx, v, &obj2) ||
                    !js_TryMethod(cx, obj2,
                                  cx->runtime->atomState.toLocaleStringAtom,
                                  0, NULL, &v)) {
                    str = NULL;
                } else {
                    str = js_ValueToString(cx, v);
                }
            } else {
                str = (literalize ? js_ValueToSource : js_ValueToString)(cx, v);
            }
            if (!str) {
                ok = JS_FALSE;
                goto done;
            }
        }

        /* Allocate 3 + 1 at end for ", ", closing bracket, and zero. */
        growth = (nchars + (sepstr ? seplen : 0) +
                  JSSTRING_LENGTH(str) +
                  3 + 1) * sizeof(jschar);
        if (!chars) {
            chars = (jschar *) malloc(growth);
            if (!chars)
                goto done;
        } else {
            chars = (jschar *) realloc((ochars = chars), growth);
            if (!chars) {
                free(ochars);
                goto done;
            }
        }

        if (sepstr) {
            js_strncpy(&chars[nchars], sepstr, seplen);
            nchars += seplen;
        }
        sepstr = JSSTRING_CHARS(sep);

        tmplen = JSSTRING_LENGTH(str);
        js_strncpy(&chars[nchars], JSSTRING_CHARS(str), tmplen);
        nchars += tmplen;
    }

  done:
    if (literalize) {
        if (chars) {
            if (JSVAL_IS_VOID(v)) {
                chars[nchars++] = ',';
                chars[nchars++] = ' ';
            }
            chars[nchars++] = ']';
        }
    } else {
        CLEAR_BUSY(he);
    }
    js_LeaveSharpObject(cx, NULL);
    if (!ok) {
        if (chars)
            free(chars);
        return ok;
    }

  make_string:
    if (!chars) {
        JS_ReportOutOfMemory(cx);
        return JS_FALSE;
    }
    chars[nchars] = 0;
    str = js_NewString(cx, chars, nchars, 0);
    if (!str) {
        free(chars);
        return JS_FALSE;
    }
    *rval = STRING_TO_JSVAL(str);
    return JS_TRUE;
}