Add borrowing and consuming modifiers and copy operator

https://github.com/apple/swift-evolution/blob/main/proposals/0377-parameter-ownership-modifiers.md

Author: taku0

swift-mode-font-lock.el

@@ -524,7 +524,8 @@ Return nil otherwise."
   '("associatedtype" "class" "deinit" "enum" "extension" "fileprivate" "func"
     "import" "init" "inout" "internal" "let" "open" "operator" "private"
     "protocol" "public" "any" "some" "static" "struct" "subscript" "typealias"
-    "var" "actor" "nonisolated" "isolated" "distributed")
+    "var" "actor" "nonisolated" "isolated" "distributed"
+    "borrowing" "consuming")
   "Keywords used in declarations.")
 
 (defconst swift-mode:statement-keywords
@@ -534,7 +535,7 @@ Return nil otherwise."
 
 (defconst swift-mode:expression-keywords
   '("as" "catch" "dynamicType" "is" "rethrows" "super" "self" "Self" "throws"
-    "throw" "try" "async" "await" "consume")
+    "throw" "try" "async" "await" "consume" "copy")
   "Keywords used in expressions and types.
 
 Excludes true, false, and keywords begin with a number sign.")

swift-mode-indent.el

@@ -1649,7 +1649,7 @@ It is a Generic parameter list if:
     "as" "as?" "as!"
     "is"
     "await"
-    "consume"
+    "consume" "copy"
     "in"
     "init" "deinit" "get" "set" "willSet" "didSet" "subscript"
     "for" "case" "default" "while" "let" "var" "repeat" "if" "else"

swift-mode-lexer.el

@@ -99,7 +99,7 @@ END is the point after the token."
 
 ;; Token types is one of the following symbols:
 ;;
-;; - prefix-operator (including try, try?, try!, await, and consume)
+;; - prefix-operator (including try, try?, try!, await, consume, and copy)
 ;; - postfix-operator
 ;; - binary-operator (including as, as?, as!, is, =, ., and ->)
 ;; - attribute (e.g. @objc, @abc(def))
@@ -609,10 +609,11 @@ return non-nil."
        ;; Suppress implicit semicolon around keywords that cannot start or end
        ;; statements.
        (member (swift-mode:token:text previous-token)
-               '("any" "some" "inout" "in" "where" "isolated"))
+               '("any" "some" "inout" "borrowing" "consuming" "in" "where"
+                 "isolated"))
        (member (swift-mode:token:text next-token)
-               '("any" "some" "inout" "throws" "rethrows" "in" "where"
-                 "isolated")))
+               '("any" "some" "inout" "borrowing" "consuming" "throws"
+                 "rethrows" "in" "where" "isolated")))
       nil)
 
      ;; Before async
@@ -987,7 +988,7 @@ Other properties are the same as the TOKEN."
        (type
         (cond
          (is-declaration 'identifier)
-         ((member text '("try" "try?" "try!" "await" "consume"))
+         ((member text '("try" "try?" "try!" "await" "consume" "copy"))
           'prefix-operator)
          ((equal text ".") 'binary-operator)
          ((and has-preceding-space has-following-space) 'binary-operator)
@@ -1146,7 +1147,7 @@ This function does not return `implicit-;' or `type-:'."
        pos-after-comment
        (point))))
 
-   ;; Operator (other than as, try, is, await, or consume)
+   ;; Operator (other than as, try, is, await, consume, or copy)
    ;;
    ;; Operators starts with a dot can contains dots. Other operators cannot
    ;; contain dots.
@@ -1245,7 +1246,7 @@ This function does not return `implicit-;' or `type-:'."
                           text
                           (- (point) (length text))
                           (point)))
-       ((member text '("await" "consume"))
+       ((member text '("await" "consume" "copy"))
         (swift-mode:token 'prefix-operator
                           text
                           (- (point) (length text))
@@ -1418,7 +1419,7 @@ This function does not return `implicit-;' or `type-:'."
        (point)
        pos-before-comment)))
 
-   ;; Operator (other than as, try, is, await, or consume)
+   ;; Operator (other than as, try, is, await, consume, or copy)
    ;;
    ;; Operators which starts with a dot can contain other dots. Other
    ;; operators cannot contain dots.
@@ -1500,7 +1501,7 @@ This function does not return `implicit-;' or `type-:'."
                           text
                           (point)
                           (+ (point) (length text))))
-       ((member text '("try" "await" "consume"))
+       ((member text '("try" "await" "consume" "copy"))
         (swift-mode:token 'prefix-operator
                           text
                           (point)

test/swift-files/indent/declarations.swift

@@ -343,11 +343,13 @@ private
       inout
       Int,
     y:
+      borrowing
       Int
       =
       1,
     z,
     w:
+      consuming
       Int
       ...
   )

test/swift-files/indent/expressions.swift

@@ -833,3 +833,13 @@ func foo() {
 
     return y
 }
+
+
+// copy operator
+// https://github.com/apple/swift-evolution/blob/main/proposals/0377-parameter-ownership-modifiers.md
+
+func foo() {
+    // copy operator cannot be followed by a line break.
+    copy
+    x
+}

test/swift-files/indent/identifiers.swift

@@ -67,6 +67,12 @@ func foo() {
     foo(
       inout: 1
     )
+    foo(
+      borrowing: 1
+    )
+    foo(
+      consuming: 1
+    )
     foo(
       internal: 1
     )
@@ -215,6 +221,9 @@ func foo() {
     foo(
       consume: 1
     )
+    foo(
+      copy: 1
+    )
 
     // Keywords reserved in particular contexts
     foo(