Handle strings containing command substitutions

corpus/expressions.txt

@@ -120,3 +120,19 @@ echo "a ${b} c" "d $e"
   (command (command_name)
     (string (expansion (variable_name)))
     (string (simple_expansion (variable_name)))))
+
+=========================================
+Strings containing command substitutions
+=========================================
+
+find "`dirname $file`" -name "$base"'*'
+
+---
+
+(program
+  (command
+    (command_name)
+    (string (command_substitution (command (command_name) (simple_expansion (variable_name)))))
+    (word)
+    (string (simple_expansion (variable_name)))
+    (raw_string)))

grammar.js

@@ -131,7 +131,7 @@ module.exports = grammar({
       $._statement
     )),
 
-    list: $ => prec.left(seq(
+    list: $ => prec.left(-1, seq(
       $._statement,
       choice('&&', '||'),
       $._statement
@@ -204,6 +204,7 @@ module.exports = grammar({
     _expression: $ => choice(
       $.word,
       $.string,
+      $.array,
       $.raw_string,
       $.expansion,
       $.simple_expansion,
@@ -214,7 +215,7 @@ module.exports = grammar({
     string: $ => seq(
       '"',
       repeat(choice(
-        /[^"$]+/,
+        /[^"`$]+/,
         $.expansion,
         $.simple_expansion,
         $.command_substitution
@@ -222,6 +223,12 @@ module.exports = grammar({
       '"'
     ),
 
+    array: $ => seq(
+      '(',
+      repeat($.word),
+      ')'
+    ),
+
     raw_string: $ => /'[^']*'/,
 
     simple_expansion: $ => seq(
@@ -248,8 +255,8 @@ module.exports = grammar({
     ),
 
     command_substitution: $ => choice(
-      seq('$(', $.command, ')'),
-      seq('`', $.command, '`')
+      seq('$(', $._statement, ')'),
+      prec(1, seq('`', $._statement, '`'))
     ),
 
     process_substitution: $ => seq(

src/grammar.json

@@ -396,7 +396,7 @@
     },
     "list": {
       "type": "PREC_LEFT",
-      "value": 0,
+      "value": -1,
       "content": {
         "type": "SEQ",
         "members": [
@@ -727,6 +727,10 @@
           "type": "SYMBOL",
           "name": "string"
         },
+        {
+          "type": "SYMBOL",
+          "name": "array"
+        },
         {
           "type": "SYMBOL",
           "name": "raw_string"
@@ -763,7 +767,7 @@
             "members": [
               {
                 "type": "PATTERN",
-                "value": "[^\"$]+"
+                "value": "[^\"`$]+"
               },
               {
                 "type": "SYMBOL",
@@ -786,6 +790,26 @@
         }
       ]
     },
+    "array": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "("
+        },
+        {
+          "type": "REPEAT",
+          "content": {
+            "type": "SYMBOL",
+            "name": "word"
+          }
+        },
+        {
+          "type": "STRING",
+          "value": ")"
+        }
+      ]
+    },
     "raw_string": {
       "type": "PATTERN",
       "value": "'[^']*'"
@@ -900,7 +924,7 @@
             },
             {
               "type": "SYMBOL",
-              "name": "command"
+              "name": "_statement"
             },
             {
               "type": "STRING",
@@ -909,21 +933,25 @@
           ]
         },
         {
-          "type": "SEQ",
-          "members": [
-            {
-              "type": "STRING",
-              "value": "`"
-            },
-            {
-              "type": "SYMBOL",
-              "name": "command"
-            },
-            {
-              "type": "STRING",
-              "value": "`"
-            }
-          ]
+          "type": "PREC",
+          "value": 1,
+          "content": {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "STRING",
+                "value": "`"
+              },
+              {
+                "type": "SYMBOL",
+                "name": "_statement"
+              },
+              {
+                "type": "STRING",
+                "value": "`"
+              }
+            ]
+          }
         }
       ]
     },