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82 lines
1.9 KiB
82 lines
1.9 KiB
/*
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* Pointer built-ins
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*/
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#include "duk_internal.h"
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/*
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* Constructor
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*/
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int duk_builtin_pointer_constructor(duk_context *ctx) {
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/* FIXME: this behavior is quite useless now; it would be nice to be able
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* to create pointer values from e.g. numbers or strings. Numbers are
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* problematic on 64-bit platforms though. Hex encoded strings?
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*/
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if (duk_get_top(ctx) == 0) {
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duk_push_pointer(ctx, NULL);
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} else {
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duk_to_pointer(ctx, 0);
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}
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DUK_ASSERT(duk_is_pointer(ctx, 0));
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duk_set_top(ctx, 1);
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if (duk_is_constructor_call(ctx)) {
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duk_push_object_helper(ctx,
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DUK_HOBJECT_FLAG_EXTENSIBLE |
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DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_POINTER),
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DUK_BIDX_POINTER_PROTOTYPE);
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/* Pointer object internal value is immutable */
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duk_dup(ctx, 0);
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duk_def_prop_stridx(ctx, -2, DUK_STRIDX_INT_VALUE, DUK_PROPDESC_FLAGS_NONE);
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}
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/* Note: unbalanced stack on purpose */
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return 1;
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}
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/*
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* toString(), valueOf()
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*/
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static int buffer_tostring_valueof_helper(duk_context *ctx, int to_string) {
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duk_tval *tv;
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duk_push_this(ctx);
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tv = duk_require_tval(ctx, -1);
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DUK_ASSERT(tv != NULL);
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if (DUK_TVAL_IS_POINTER(tv)) {
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/* nop */
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} else if (DUK_TVAL_IS_OBJECT(tv)) {
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duk_hobject *h = DUK_TVAL_GET_OBJECT(tv);
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DUK_ASSERT(h != NULL);
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/* Must be a "pointer object", i.e. class "Pointer" */
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if (DUK_HOBJECT_GET_CLASS_NUMBER(h) != DUK_HOBJECT_CLASS_POINTER) {
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goto type_error;
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}
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duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INT_VALUE);
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} else {
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goto type_error;
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}
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if (to_string) {
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duk_to_string(ctx, -1);
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}
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return 1;
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type_error:
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return DUK_RET_TYPE_ERROR;
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}
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int duk_builtin_pointer_prototype_to_string(duk_context *ctx) {
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return buffer_tostring_valueof_helper(ctx, 1);
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}
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int duk_builtin_pointer_prototype_value_of(duk_context *ctx) {
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return buffer_tostring_valueof_helper(ctx, 0);
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}
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