syntax: implement `delete` as proper operator

Turn `delete` into a proper operator mimicking ECMAScript semantics.

Also ensure to transparently turn deprecated `delete(obj, propname)`
function calls into `delete obj.propname` expressions during compilation.

When strict mode is active, legacy delete() calls throw a syntax error
instead.

Finally drop the `delete()` function from the stdlib as it is shadowed
by the delete operator syntax now.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 16 insertions, 0 deletions

diff --git a/value.c b/value.c
index 0827038..c012b78 100644
--- a/value.c
+++ b/value.c
@@ -248,6 +248,22 @@ uc_setval(uc_vm *vm, uc_value_t *scope, uc_value_t *key, uc_value_t *val)
 }
 
 bool
+uc_delval(uc_vm *vm, uc_value_t *scope, uc_value_t *key)
+{
+	char *s;
+	bool rv;
+
+	if (!key)
+		return NULL;
+
+	s = uc_tostring(vm, key);
+	rv = ucv_object_delete(scope, s ? s : ucv_string_get(key));
+	free(s);
+
+	return rv;
+}
+
+bool
 uc_cmp(int how, uc_value_t *v1, uc_value_t *v2)
 {
 	uc_type_t t1 = ucv_type(v1);