patch 9.0.1001: classes are not documented or implemented yet
Problem: Classes are not documented or implemented yet.
Solution: Make the first steps at documenting Vim9 objects, classes and
interfaces. Make initial choices for the syntax. Add a skeleton
implementation. Add "public" and "this" in the command table.
diff --git a/src/vim9class.c b/src/vim9class.c
new file mode 100644
index 0000000..b2307cb
--- /dev/null
+++ b/src/vim9class.c
@@ -0,0 +1,110 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved by Bram Moolenaar
+ *
+ * Do ":help uganda" in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * vim9class.c: Vim9 script class support
+ */
+
+#define USING_FLOAT_STUFF
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+// When not generating protos this is included in proto.h
+#ifdef PROTO
+# include "vim9.h"
+#endif
+
+/*
+ * Handle ":class" and ":abstract class" up to ":endclass".
+ */
+ void
+ex_class(exarg_T *eap)
+{
+ int is_abstract = eap->cmdidx == CMD_abstract;
+
+ char_u *arg = eap->arg;
+ if (is_abstract)
+ {
+ if (STRNCMP(arg, "class", 5) != 0 || !VIM_ISWHITE(arg[5]))
+ {
+ semsg(_(e_invalid_argument_str), arg);
+ return;
+ }
+ arg = skipwhite(arg + 5);
+ }
+
+ if (!ASCII_ISUPPER(*arg))
+ {
+ semsg(_(e_class_name_must_start_with_uppercase_letter_str), arg);
+ return;
+ }
+
+ // TODO:
+ // generics: <Tkey, Tentry>
+ // extends SomeClass
+ // implements SomeInterface
+ // specifies SomeInterface
+
+
+ // TODO: handle until "endclass" is found:
+ // object and class members (public, read access, private):
+ // public this.varname
+ // public static varname
+ // this.varname
+ // static varname
+ // this._varname
+ // static _varname
+ //
+ // constructors:
+ // def new()
+ // enddef
+ // def newOther()
+ // enddef
+ //
+ // methods (object, class, generics):
+ // def someMethod()
+ // enddef
+ // static def someMethod()
+ // enddef
+ // def <Tval> someMethod()
+ // enddef
+ // static def <Tval> someMethod()
+ // enddef
+}
+
+/*
+ * Handle ":interface" up to ":endinterface".
+ */
+ void
+ex_interface(exarg_T *eap UNUSED)
+{
+ // TODO
+}
+
+/*
+ * Handle ":enum" up to ":endenum".
+ */
+ void
+ex_enum(exarg_T *eap UNUSED)
+{
+ // TODO
+}
+
+/*
+ * Handle ":type".
+ */
+ void
+ex_type(exarg_T *eap UNUSED)
+{
+ // TODO
+}
+
+
+#endif // FEAT_EVAL