src/js/macros.py

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# Dictionary that is passed as defines for js2c.py.
# Used for defines that must be defined for all native JS files.

define NONE        = 0;
define READ_ONLY   = 1;
define DONT_ENUM   = 2;
define DONT_DELETE = 4;

# Type query macros.
macro IS_ARRAY(arg)             = (%_IsArray(arg));
macro IS_NULL(arg)              = (arg === null);
macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
macro IS_SYMBOL(arg)            = (typeof(arg) === 'symbol');
macro IS_UNDEFINED(arg)         = (arg === (void 0));
macro IS_CALLABLE(arg) = (typeof(arg) === 'function');

# Inline macros.
macro TO_LENGTH(arg) = (%_ToLength(arg));
macro TO_STRING(arg) = (%_ToString(arg));

macro DEFINE_METHOD_LEN(obj, method_def, len) = %DefineMethodsInternal(obj, class { method_def }, len);
macro DEFINE_METHOD(obj, method_def) = DEFINE_METHOD_LEN(obj, method_def, -1);

# Constants.  The compiler constant folds them.
define UNDEFINED = (void 0);