unified: Group more paired items

Same as in the preceding commit, these items do not make sense as
separate fields on the parent node, so we materialise (or create new)
intermediate nodes to group them together.

Author: tausbn

unified/extractor/tree-sitter-swift/grammar.js

@@ -105,8 +105,8 @@ module.exports = grammar({
     // { (foo, bar) ...
     [$.expression, $.lambda_parameter],
     [$._primary_expression, $.lambda_parameter],
-    // (start: start, end: end)
-    [$._tuple_type_item_identifier, $.tuple_expression],
+    // (foo) where foo could be a binding pattern or a tuple expression item.
+    [$._binding_pattern_with_expr, $.tuple_expression_item],
     // After a `{` in a function or switch context, it's ambigous whether we're starting a set of local statements or
     // applying some modifiers to a capture or pattern.
     [$.modifiers],
@@ -931,26 +931,25 @@ module.exports = grammar({
         PRECS.tuple,
         seq(
           "(",
-          sep1Opt(
-            seq(
-              optional(seq(field("name", $.simple_identifier), ":")),
-              field("value", $.expression)
-            ),
-            ","
-          ),
+          sep1Opt(field("element", $.tuple_expression_item), ","),
           ")"
         )
       ),
+    tuple_expression_item: ($) =>
+      seq(
+        optional(seq(field("name", $.simple_identifier), ":")),
+        field("value", $.expression)
+      ),
     array_literal: ($) =>
       seq("[", optional(sep1Opt(field("element", $.expression), ",")), "]"),
     dictionary_literal: ($) =>
       seq(
         "[",
-        choice(":", sep1Opt($._dictionary_literal_item, ",")),
+        choice(":", sep1Opt(field("element", $.dictionary_literal_item), ",")),
         optional(","),
         "]"
       ),
-    _dictionary_literal_item: ($) =>
+    dictionary_literal_item: ($) =>
       seq(field("key", $.expression), ":", field("value", $.expression)),
     special_literal: ($) =>
       seq(
@@ -968,11 +967,13 @@ module.exports = grammar({
     playground_literal: ($) =>
       seq(
         $._hash_symbol,
-        choice("colorLiteral", "fileLiteral", "imageLiteral"),
+        field("kind", choice("colorLiteral", "fileLiteral", "imageLiteral")),
         "(",
-        sep1Opt(seq(field("name", $.simple_identifier), ":", field("value", $.expression)), ","),
+        sep1Opt(field("argument", $.playground_literal_argument), ","),
         ")"
       ),
+    playground_literal_argument: ($) =>
+      seq(field("name", $.simple_identifier), ":", field("value", $.expression)),
     lambda_literal: ($) =>
       prec.left(
         PRECS.lambda,

unified/extractor/tree-sitter-swift/node-types.yml

@@ -248,8 +248,10 @@ named:
     entry*: [bin_literal, boolean_literal, hex_literal, integer_literal, line_string_literal, multi_line_string_literal, "nil", oct_literal, raw_string_literal, real_literal, regex_literal, simple_identifier]
   diagnostic:
   dictionary_literal:
-    key*: expression
-    value*: expression
+    element*: dictionary_literal_item
+  dictionary_literal_item:
+    key: expression
+    value: expression
   dictionary_type:
     key: type
     value: type
@@ -483,8 +485,11 @@ named:
     bound_identifier?: simple_identifier
     kind: [binding_pattern, case_pattern, expression, tuple_pattern, type_casting_pattern, wildcard_pattern]
   playground_literal:
-    name+: simple_identifier
-    value+: expression
+    argument+: playground_literal_argument
+    kind: ["colorLiteral", "fileLiteral", "imageLiteral"]
+  playground_literal_argument:
+    name: simple_identifier
+    value: expression
   postfix_expression:
     operation: ["++", "--", bang]
     target: expression
@@ -613,8 +618,10 @@ named:
     operator: try_operator
   try_operator:
   tuple_expression:
-    name*: simple_identifier
-    value+: expression
+    element+: tuple_expression_item
+  tuple_expression_item:
+    name?: simple_identifier
+    value: expression
   tuple_pattern:
     item+: tuple_pattern_item
   tuple_pattern_item: