adding zsh expansion flagsSee https://zsh.sourceforge.io/Doc/Release/Expansion.html\#Parameter-Expansion-Flags (#115)

corpus/zsh.txt

@@ -0,0 +1,35 @@
+# See https://zsh.sourceforge.io/Doc/Release/Expansion.html#Parameter-Expansion-Flags
+=============================
+Parameter Expansion Flags
+=============================
+echo ${(v)V}
+echo ${(s.:.)V}
+echo ${(@)V}
+echo ${()V}
+
+---
+
+(program
+  (command (command_name (word)) (expansion (expansion_flags) (variable_name)))
+  (command (command_name (word)) (expansion (expansion_flags) (variable_name)))
+  (command (command_name (word)) (expansion (expansion_flags) (variable_name)))
+  (command (command_name (word)) (expansion (expansion_flags) (variable_name))))
+
+=============================
+Parameter Expansion Flags Quotes
+=============================
+echo "${(v_sldkfj_sdklfj)V}"
+
+---
+
+(program
+  (command (command_name (word)) (string (expansion (expansion_flags) (variable_name)))))
+=============================
+Parameter Expansion Invalid Flags
+=============================
+echo "${(())V}"
+
+---
+
+(program
+(command (command_name (word)) (string (expansion (ERROR) (expansion_flags) (ERROR (word))))))

grammar.js

@@ -490,8 +490,12 @@ module.exports = grammar({
 
     string_expansion: $ => seq('$', choice($.string, $.raw_string)),
 
+    // See https://zsh.sourceforge.io/Doc/Release/Expansion.html#Parameter-Expansion-Flags
+    expansion_flags: ($) => seq("(", repeat(/[^()]/), ")"),
+
     expansion: $ => seq(
       '${',
+      optional($.expansion_flags),
       optional(choice('#', '!')),
       optional(choice(
         seq(

package.json

@@ -30,7 +30,8 @@
       "scope": "source.bash",
       "file-types": [
         "sh",
-        "bash"
+        "bash",
+        "zsh"
       ]
     }
   ]

queries/highlights.scm

@@ -46,6 +46,7 @@
   ">>"
   "<"
   "|"
+  (expansion_flags)
 ] @operator
 
 (

src/grammar.json

@@ -2153,6 +2153,26 @@
         }
       ]
     },
+    "expansion_flags": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "("
+        },
+        {
+          "type": "REPEAT",
+          "content": {
+            "type": "PATTERN",
+            "value": "[^()]"
+          }
+        },
+        {
+          "type": "STRING",
+          "value": ")"
+        }
+      ]
+    },
     "expansion": {
       "type": "SEQ",
       "members": [
@@ -2160,6 +2180,18 @@
           "type": "STRING",
           "value": "${"
         },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "expansion_flags"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "CHOICE",
           "members": [

src/node-types.json

@@ -638,6 +638,10 @@
           "type": "concatenation",
           "named": true
         },
+        {
+          "type": "expansion_flags",
+          "named": true
+        },
         {
           "type": "regex",
           "named": true
@@ -657,6 +661,11 @@
       ]
     }
   },
+  {
+    "type": "expansion_flags",
+    "named": true,
+    "fields": {}
+  },
   {
     "type": "file_redirect",
     "named": true,