--- /dev/null
+/*
+ * Number built-ins
+ */
+
+#include "duk_internal.h"
+
+DUK_LOCAL duk_double_t duk__push_this_number_plain(duk_context *ctx) {
+ duk_hobject *h;
+
+ /* Number built-in accepts a plain number or a Number object (whose
+ * internal value is operated on). Other types cause TypeError.
+ */
+
+ duk_push_this(ctx);
+ if (duk_is_number(ctx, -1)) {
+ DUK_DDD(DUK_DDDPRINT("plain number value: %!T", (duk_tval *) duk_get_tval(ctx, -1)));
+ goto done;
+ }
+ h = duk_get_hobject(ctx, -1);
+ if (!h ||
+ (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_NUMBER)) {
+ DUK_DDD(DUK_DDDPRINT("unacceptable this value: %!T", (duk_tval *) duk_get_tval(ctx, -1)));
+ DUK_ERROR_TYPE((duk_hthread *) ctx, "number expected");
+ }
+ duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INT_VALUE);
+ DUK_ASSERT(duk_is_number(ctx, -1));
+ DUK_DDD(DUK_DDDPRINT("number object: %!T, internal value: %!T",
+ (duk_tval *) duk_get_tval(ctx, -2), (duk_tval *) duk_get_tval(ctx, -1)));
+ duk_remove(ctx, -2);
+
+ done:
+ return duk_get_number(ctx, -1);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_constructor(duk_context *ctx) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_idx_t nargs;
+ duk_hobject *h_this;
+
+ DUK_UNREF(thr);
+
+ /*
+ * The Number constructor uses ToNumber(arg) for number coercion
+ * (coercing an undefined argument to NaN). However, if the
+ * argument is not given at all, +0 must be used instead. To do
+ * this, a vararg function is used.
+ */
+
+ nargs = duk_get_top(ctx);
+ if (nargs == 0) {
+ duk_push_int(ctx, 0);
+ }
+ duk_to_number(ctx, 0);
+ duk_set_top(ctx, 1);
+ DUK_ASSERT_TOP(ctx, 1);
+
+ if (!duk_is_constructor_call(ctx)) {
+ return 1;
+ }
+
+ /*
+ * E5 Section 15.7.2.1 requires that the constructed object
+ * must have the original Number.prototype as its internal
+ * prototype. However, since Number.prototype is non-writable
+ * and non-configurable, this doesn't have to be enforced here:
+ * The default object (bound to 'this') is OK, though we have
+ * to change its class.
+ *
+ * Internal value set to ToNumber(arg) or +0; if no arg given,
+ * ToNumber(undefined) = NaN, so special treatment is needed
+ * (above). String internal value is immutable.
+ */
+
+ /* XXX: helper */
+ duk_push_this(ctx);
+ h_this = duk_get_hobject(ctx, -1);
+ DUK_ASSERT(h_this != NULL);
+ DUK_HOBJECT_SET_CLASS_NUMBER(h_this, DUK_HOBJECT_CLASS_NUMBER);
+
+ DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h_this) == thr->builtins[DUK_BIDX_NUMBER_PROTOTYPE]);
+ DUK_ASSERT(DUK_HOBJECT_GET_CLASS_NUMBER(h_this) == DUK_HOBJECT_CLASS_NUMBER);
+ DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(h_this));
+
+ duk_dup(ctx, 0); /* -> [ val obj val ] */
+ duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE);
+ return 0; /* no return value -> don't replace created value */
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_value_of(duk_context *ctx) {
+ (void) duk__push_this_number_plain(ctx);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_string(duk_context *ctx) {
+ duk_small_int_t radix;
+ duk_small_uint_t n2s_flags;
+
+ (void) duk__push_this_number_plain(ctx);
+ if (duk_is_undefined(ctx, 0)) {
+ radix = 10;
+ } else {
+ radix = (duk_small_int_t) duk_to_int_check_range(ctx, 0, 2, 36);
+ }
+ DUK_DDD(DUK_DDDPRINT("radix=%ld", (long) radix));
+
+ n2s_flags = 0;
+
+ duk_numconv_stringify(ctx,
+ radix /*radix*/,
+ 0 /*digits*/,
+ n2s_flags /*flags*/);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_locale_string(duk_context *ctx) {
+ /* XXX: just use toString() for now; permitted although not recommended.
+ * nargs==1, so radix is passed to toString().
+ */
+ return duk_bi_number_prototype_to_string(ctx);
+}
+
+/*
+ * toFixed(), toExponential(), toPrecision()
+ */
+
+/* XXX: shared helper for toFixed(), toExponential(), toPrecision()? */
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_fixed(duk_context *ctx) {
+ duk_small_int_t frac_digits;
+ duk_double_t d;
+ duk_small_int_t c;
+ duk_small_uint_t n2s_flags;
+
+ frac_digits = (duk_small_int_t) duk_to_int_check_range(ctx, 0, 0, 20);
+ d = duk__push_this_number_plain(ctx);
+
+ c = (duk_small_int_t) DUK_FPCLASSIFY(d);
+ if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) {
+ goto use_to_string;
+ }
+
+ if (d >= 1.0e21 || d <= -1.0e21) {
+ goto use_to_string;
+ }
+
+ n2s_flags = DUK_N2S_FLAG_FIXED_FORMAT |
+ DUK_N2S_FLAG_FRACTION_DIGITS;
+
+ duk_numconv_stringify(ctx,
+ 10 /*radix*/,
+ frac_digits /*digits*/,
+ n2s_flags /*flags*/);
+ return 1;
+
+ use_to_string:
+ DUK_ASSERT_TOP(ctx, 2);
+ duk_to_string(ctx, -1);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_exponential(duk_context *ctx) {
+ duk_bool_t frac_undefined;
+ duk_small_int_t frac_digits;
+ duk_double_t d;
+ duk_small_int_t c;
+ duk_small_uint_t n2s_flags;
+
+ d = duk__push_this_number_plain(ctx);
+
+ frac_undefined = duk_is_undefined(ctx, 0);
+ duk_to_int(ctx, 0); /* for side effects */
+
+ c = (duk_small_int_t) DUK_FPCLASSIFY(d);
+ if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) {
+ goto use_to_string;
+ }
+
+ frac_digits = (duk_small_int_t) duk_to_int_check_range(ctx, 0, 0, 20);
+
+ n2s_flags = DUK_N2S_FLAG_FORCE_EXP |
+ (frac_undefined ? 0 : DUK_N2S_FLAG_FIXED_FORMAT);
+
+ duk_numconv_stringify(ctx,
+ 10 /*radix*/,
+ frac_digits + 1 /*leading digit + fractions*/,
+ n2s_flags /*flags*/);
+ return 1;
+
+ use_to_string:
+ DUK_ASSERT_TOP(ctx, 2);
+ duk_to_string(ctx, -1);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_number_prototype_to_precision(duk_context *ctx) {
+ /* The specification has quite awkward order of coercion and
+ * checks for toPrecision(). The operations below are a bit
+ * reordered, within constraints of observable side effects.
+ */
+
+ duk_double_t d;
+ duk_small_int_t prec;
+ duk_small_int_t c;
+ duk_small_uint_t n2s_flags;
+
+ DUK_ASSERT_TOP(ctx, 1);
+
+ d = duk__push_this_number_plain(ctx);
+ if (duk_is_undefined(ctx, 0)) {
+ goto use_to_string;
+ }
+ DUK_ASSERT_TOP(ctx, 2);
+
+ duk_to_int(ctx, 0); /* for side effects */
+
+ c = (duk_small_int_t) DUK_FPCLASSIFY(d);
+ if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) {
+ goto use_to_string;
+ }
+
+ prec = (duk_small_int_t) duk_to_int_check_range(ctx, 0, 1, 21);
+
+ n2s_flags = DUK_N2S_FLAG_FIXED_FORMAT |
+ DUK_N2S_FLAG_NO_ZERO_PAD;
+
+ duk_numconv_stringify(ctx,
+ 10 /*radix*/,
+ prec /*digits*/,
+ n2s_flags /*flags*/);
+ return 1;
+
+ use_to_string:
+ /* Used when precision is undefined; also used for NaN (-> "NaN"),
+ * and +/- infinity (-> "Infinity", "-Infinity").
+ */
+
+ DUK_ASSERT_TOP(ctx, 2);
+ duk_to_string(ctx, -1);
+ return 1;
+}
projects / ceph.git / blobdiff