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Implement Symbol.isConcatSpreadable (#3307)

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Algorithm is based on ECMA-262 v6, 22.1.3.1.1

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu
This commit is contained in:
Szilagyi Adam
2019-11-19 13:55:49 +01:00
committed by Dániel Bátyai
parent 8bdb32cc88
commit a7d129c8b2
7 changed files with 186 additions and 39 deletions
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jerry-core/ecma/operations/ecma-objects.c
+38
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@@ -19,6 +19,7 @@
#include "ecma-exceptions.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-function-object.h"
#include "ecma-lex-env.h"
#include "ecma-string-object.h"
@@ -2474,6 +2475,43 @@ ecma_object_class_is (ecma_object_t *object_p, /**< object */
return false;
} /* ecma_object_class_is */
#if ENABLED (JERRY_ES2015)
/**
* Object's IsConcatSpreadable operation, used for Array.prototype.concat
* It checks the argument's [Symbol.isConcatSpreadable] property value
*
* See also:
* ECMA-262 v6, 22.1.3.1.1;
*
* @return ECMA_VALUE_ERROR - if the operation fails
* ECMA_VALUE_TRUE - if the argument is concatSpreadable
* ECMA_VALUE_FALSE - otherwise
*/
ecma_value_t
ecma_op_is_concat_spreadable (ecma_value_t arg) /**< argument */
{
if (!ecma_is_value_object (arg))
{
return ECMA_VALUE_FALSE;
}
ecma_value_t spreadable = ecma_op_object_get_by_symbol_id (ecma_get_object_from_value (arg),
LIT_MAGIC_STRING_IS_CONCAT_SPREADABLE);
if (ECMA_IS_VALUE_ERROR (spreadable))
{
return spreadable;
}
if (!ecma_is_value_undefined (spreadable))
{
return ecma_make_boolean_value (ecma_op_to_boolean (spreadable));
}
return (ecma_make_boolean_value (ecma_is_value_array (arg)));
} /* ecma_op_is_concat_spreadable */
#endif /* ENABLED (JERRY_ES2015) */
/**
* @}
* @}