patch 8.2.2982: Vim9: future commands are not reserved yet

Problem:    Vim9: future commands are not reserved yet.
Solution:   Add commands to be implemented later.  Make "this" a reserved
            name.

runtime/doc/vim9.txt

@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 8.2.  Last change: 2021 May 26
+*vim9.txt*	For Vim version 8.2.  Last change: 2021 Jun 12
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -169,6 +169,14 @@ created yet.  In this case you can call `execute()` to invoke it at runtime. >
 used for the command or inside a `:try` block), does not get a range passed
 cannot be a "dict" function, and can always be a closure.
 
+Later classes will be added, which replaces the "dict function" mechanism.
+For now you will need to pass the dictionary explicitly: >
+	def DictFunc(d: dict<any>, arg: string)
+	   echo d[arg]
+	enddef
+	var d = {item: 'value', func: DictFunc}
+	d.func(d, 'item')
+
 The argument types and return type need to be specified.  The "any" type can
 be used, type checking will then be done at runtime, like with legacy
 functions.
@@ -445,7 +453,7 @@ it is the start of a lambda or a dictionary, which is now more complicated
 because of the use of argument types.
 
 To avoid these problems Vim9 script uses a different syntax for a lambda,
-which is similar to Javascript: >
+which is similar to JavaScript: >
 	var Lambda = (arg) => expression
 
 No line break is allowed in the arguments of a lambda up to and including the
@@ -522,7 +530,7 @@ And when a dict spans multiple lines: >
 		one: 1,
 		two: 2,
 		}
-Function call: >
+With a function call: >
 	var result = Func(
 			arg1,
 			arg2
@@ -555,10 +563,31 @@ at the start of the line indicates line continuation: >
 		|   echo 'match'
 		| endif
 
+Note that this means that in heredoc the first line cannot be a bar: >
+	var lines =<< trim END
+	   | this doesn't work
+	END
+Either use an empty line at the start or do not use heredoc.  Or temporarily
+add the "C" flag to 'cpoptions': >
+	set cpo+=C
+	var lines =<< trim END
+	   | this doesn't work
+	END
+	set cpo-=C
+If the heredoc is inside a function 'cpoptions' must be set before :def and
+restored after the :enddef.
+
+In places where line continuation with a backslash is still needed, such as
+splitting up a long Ex command, comments can start with #\ instead of "\: >
+      syn region Text
+	      \ start='foo'
+	      #\ comment
+	      \ end='bar'
+
 <							*E1050*
 To make it possible for the operator at the start of the line to be
-recognized, it is required to put a colon before a range.  This will add
-"start" and print: >
+recognized, it is required to put a colon before a range.  This example will
+add "start" and print: >
 	var result = start
 	+ print
 Like this: >
@@ -610,6 +639,9 @@ Notes:
 <  This does not work: >
 	echo [1, 2]
 		[3, 4]
+- In some cases it is difficult for Vim to parse a command, especially when
+  commands are used as an argument to another command, such as `windo`.  In
+  those cases the line continuation with a backslash has to be used.
 
 
 White space ~
@@ -1240,9 +1272,10 @@ Exporting an item can be written as: >
 	export const someValue = ...
 	export def MyFunc() ...
 	export class MyClass ...
+	export interface MyClass ...
 
 As this suggests, only constants, variables, `:def` functions and classes can
-be exported. {not implemented yet: export class}
+be exported. {not implemented yet: class, interface}
 
 							*E1042*
 `:export` can only be used in Vim9 script, at the script level.
@@ -1342,27 +1375,46 @@ implementing classes is going to be a lot of work, it is left for the future.
 For now we'll just make sure classes can be added later.
 
 Thoughts:
-- `class` / `endclass`, everything in one file
-- Class names are always CamelCase
-- Single constructor
+- `class` / `endclass`, the whole class must be in one file
+- Class names are always CamelCase (to avoid a name clash with builtin types)
+- A single constructor called "constructor"
 - Single inheritance with `class ThisClass extends BaseClass`
-- `abstract class`
-- `interface` (Abstract class without any implementation)
+- `abstract class` (class with incomplete implementation)
+- `interface` / `endinterface` (abstract class without any implementation)
 - `class SomeClass implements SomeInterface`
 - Generics for class: `class <Tkey, Tentry>`
 - Generics for function: `def <Tkey> GetLast(key: Tkey)`
 
-Again, much of this is from TypeScript.
+Again, much of this is from TypeScript with a slightly different syntax.
 
 Some things that look like good additions:
 - Use a class as an interface (like Dart)
 - Extend a class with methods, using an import (like Dart)
+- Mixins
+- For testing: Mock mechanism
 
 An important class that will be provided is "Promise".  Since Vim is single
 threaded, connecting asynchronous operations is a natural way of allowing
 plugins to do their work without blocking the user.  It's a uniform way to
 invoke callbacks and handle timeouts and errors.
 
+Some examples: >
+
+	abstract class Person 
+	    static const prefix = 'xxx'
+	    var name: string
+	    
+	    def constructor(name: string)
+		this.name = name;
+	    enddef
+
+	    def display(): void
+		echo name
+	    enddef
+
+	    abstract def find(string): Person
+	endclass
+
 ==============================================================================
 
 9. Rationale						*vim9-rationale*

src/ex_cmdidxs.h

@@ -6,31 +6,31 @@
 static const unsigned short cmdidxs1[26] =
 {
   /* a */ 0,
-  /* b */ 19,
-  /* c */ 43,
-  /* d */ 110,
-  /* e */ 135,
-  /* f */ 162,
-  /* g */ 179,
-  /* h */ 185,
-  /* i */ 194,
-  /* j */ 213,
-  /* k */ 215,
-  /* l */ 220,
-  /* m */ 283,
-  /* n */ 301,
-  /* o */ 321,
-  /* p */ 333,
-  /* q */ 372,
-  /* r */ 375,
-  /* s */ 395,
-  /* t */ 464,
-  /* u */ 510,
-  /* v */ 521,
-  /* w */ 542,
-  /* x */ 556,
-  /* y */ 566,
-  /* z */ 567
+  /* b */ 20,
+  /* c */ 44,
+  /* d */ 111,
+  /* e */ 136,
+  /* f */ 164,
+  /* g */ 181,
+  /* h */ 187,
+  /* i */ 196,
+  /* j */ 216,
+  /* k */ 218,
+  /* l */ 223,
+  /* m */ 286,
+  /* n */ 304,
+  /* o */ 324,
+  /* p */ 336,
+  /* q */ 375,
+  /* r */ 378,
+  /* s */ 398,
+  /* t */ 468,
+  /* u */ 514,
+  /* v */ 525,
+  /* w */ 546,
+  /* x */ 560,
+  /* y */ 570,
+  /* z */ 571
 };
 
 /*
@@ -41,15 +41,15 @@ static const unsigned short cmdidxs1[26] =
  */
 static const unsigned char cmdidxs2[26][26] =
 { /*         a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z */
-  /* a */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  4,  5,  6,  0,  0,  0,  7, 15,  0, 16,  0,  0,  0,  0,  0 },
+  /* a */ {  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  5,  6,  7,  0,  0,  0,  8, 16,  0, 17,  0,  0,  0,  0,  0 },
   /* b */ {  2,  0,  0,  5,  6,  8,  0,  0,  0,  0,  0,  9, 10, 11, 12, 13,  0, 14,  0,  0,  0,  0, 23,  0,  0,  0 },
   /* c */ {  3, 12, 16, 18, 20, 22, 25,  0,  0,  0,  0, 33, 38, 41, 47, 57, 59, 60, 61,  0, 63,  0, 66,  0,  0,  0 },
   /* d */ {  0,  0,  0,  0,  0,  0,  0,  0,  8, 18,  0, 19,  0,  0, 20,  0,  0, 22, 23,  0,  0,  0,  0,  0,  0,  0 },
-  /* e */ {  1,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,  8, 10, 11,  0,  0,  0,  0,  0,  0,  0, 21,  0, 22,  0,  0 },
+  /* e */ {  1,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,  8, 10, 11,  0,  0,  0,  0,  0,  0,  0, 22,  0, 23,  0,  0 },
   /* f */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 10,  0,  0,  0,  0,  0, 16,  0,  0,  0,  0,  0 },
   /* g */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  2,  0,  0,  4,  5,  0,  0,  0,  0 },
   /* h */ {  5,  0,  0,  0,  0,  0,  0,  0,  6,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
-  /* i */ {  1,  0,  0,  0,  0,  3,  0,  0,  0,  4,  0,  5,  6,  0,  0,  0,  0,  0, 14,  0, 16,  0,  0,  0,  0,  0 },
+  /* i */ {  1,  0,  0,  0,  0,  3,  0,  0,  0,  4,  0,  5,  6,  0,  0,  0,  0,  0, 15,  0, 17,  0,  0,  0,  0,  0 },
   /* j */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,  0 },
   /* k */ {  0,  0,  0,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
   /* l */ {  3, 11, 15, 19, 20, 25, 28, 33,  0,  0,  0, 35, 38, 41, 45, 51,  0, 53, 62, 54, 55, 59, 61,  0,  0,  0 },
@@ -59,7 +59,7 @@ static const unsigned char cmdidxs2[26][26] =
   /* p */ {  1,  0,  3,  0,  4,  0,  0,  0,  0,  0,  0,  0,  0,  0,  7,  9,  0,  0, 16, 17, 26,  0, 27,  0, 28,  0 },
   /* q */ {  2,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
   /* r */ {  0,  0,  0,  0,  0,  0,  0,  0, 12,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 14, 19,  0,  0,  0,  0 },
-  /* s */ {  2,  6, 15,  0, 19, 23,  0, 25, 26,  0,  0, 29, 31, 35, 39, 41,  0, 50,  0, 51,  0, 63, 64,  0, 65,  0 },
+  /* s */ {  2,  6, 15,  0, 19, 23,  0, 25, 26,  0,  0, 29, 31, 35, 39, 41,  0, 50,  0, 51,  0, 64, 65,  0, 66,  0 },
   /* t */ {  2,  0, 19,  0, 24, 26,  0, 27,  0, 28,  0, 29, 33, 36, 38, 39,  0, 40, 42,  0, 43,  0,  0,  0, 45,  0 },
   /* u */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
   /* v */ {  1,  0,  0,  0,  2,  0,  0,  0,  5,  0,  0,  0, 12, 15,  0,  0,  0,  0, 18,  0, 19,  0,  0,  0,  0,  0 },
@@ -69,4 +69,4 @@ static const unsigned char cmdidxs2[26][26] =
   /* z */ {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 }
 };
 
-static const int command_count = 584;
+static const int command_count = 588;

src/ex_cmds.h

@@ -122,6 +122,9 @@ EXCMD(CMD_abclear,	"abclear",	ex_abclear,
 EXCMD(CMD_aboveleft,	"aboveleft",	ex_wrongmodifier,
 	EX_NEEDARG|EX_EXTRA|EX_NOTRLCOM,
 	ADDR_NONE),
+EXCMD(CMD_abstract,	"abstract",	ex_ni,
+	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	ADDR_NONE),
 EXCMD(CMD_all,		"all",		ex_all,
 	EX_BANG|EX_RANGE|EX_COUNT|EX_TRLBAR,
 	ADDR_OTHER),
@@ -551,6 +554,9 @@ EXCMD(CMD_emenu,	"emenu",	ex_emenu,
 EXCMD(CMD_endif,	"endif",	ex_endif,
 	EX_TRLBAR|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
+EXCMD(CMD_endinterface,	"endinterface",	ex_ni,
+	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	ADDR_NONE),
 EXCMD(CMD_endclass,	"endclass",	ex_ni,
 	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
@@ -734,6 +740,9 @@ EXCMD(CMD_inoremenu,	"inoremenu",	ex_menu,
 EXCMD(CMD_intro,	"intro",	ex_intro,
 	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
+EXCMD(CMD_interface,	"interface",	ex_ni,
+	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	ADDR_NONE),
 EXCMD(CMD_isearch,	"isearch",	ex_findpat,
 	EX_BANG|EX_RANGE|EX_DFLALL|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_LINES),
@@ -1463,6 +1472,9 @@ EXCMD(CMD_startgreplace, "startgreplace", ex_startinsert,
 EXCMD(CMD_startreplace,	"startreplace",	ex_startinsert,
 	EX_BANG|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
+EXCMD(CMD_static,	"static",	ex_ni,
+	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	ADDR_NONE),
 EXCMD(CMD_stopinsert,	"stopinsert",	ex_stopinsert,
 	EX_BANG|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),

src/testdir/test_vim9_assign.vim

@@ -982,6 +982,8 @@ def Test_assignment_failure()
 
   CheckDefFailure(['var true = 1'], 'E1034:')
   CheckDefFailure(['var false = 1'], 'E1034:')
+  CheckDefFailure(['var null = 1'], 'E1034:')
+  CheckDefFailure(['var this = 1'], 'E1034:')
 
   CheckDefFailure(['[a; b; c] = g:list'], 'E452:')
   CheckDefExecFailure(['var a: number',

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2982,
 /**/
     2981,
 /**/

src/vim9script.c

@@ -979,6 +979,7 @@ static char *reserved[] = {
     "true",
     "false",
     "null",
+    "this",
     NULL
 };