Add case statements

corpus/control_flow.txt

@@ -43,3 +43,26 @@ fi
       (command (command_name) (argument)))
     (else_clause
       (command (command_name)))))
+
+====================================
+Case statements
+====================================
+
+case "opt" in
+  a)
+    echo a
+    ;;
+
+  b)
+    echo b
+    ;;
+esac
+
+---
+
+(program
+  (case_statement (argument)
+    (case_item (argument)
+      (command (command_name) (argument)))
+    (case_item (argument)
+      (command (command_name) (argument)))))

grammar.js

@@ -1,7 +1,7 @@
 module.exports = grammar({
   name: 'bash',
 
-  inline: $ => [$.statement],
+  inline: $ => [$.statement, $.terminator],
 
   externals: $ => [
     $._simple_heredoc,
@@ -20,13 +20,14 @@ module.exports = grammar({
 
     _terminated_statement: $ => seq(
       $.statement,
-      choice(';', ';;', '\n')
+      $.terminator
     ),
 
     statement: $ => choice(
       $.command,
       $.while_statement,
       $.if_statement,
+      $.case_statement,
       $.pipeline,
       $.list
     ),
@@ -37,6 +38,12 @@ module.exports = grammar({
       $.do_group
     ),
 
+    do_group: $ => seq(
+      'do',
+      repeat($._terminated_statement),
+      'done'
+    ),
+
     if_statement: $ => seq(
       'if',
       $._terminated_statement,
@@ -59,10 +66,21 @@ module.exports = grammar({
       repeat($._terminated_statement)
     ),
 
-    do_group: $ => seq(
+    case_statement: $ => seq(
-      'do',
+      'case',
+      rename($.word, 'argument'),
+      optional($.terminator),
+      'in',
+      $.terminator,
+      repeat($.case_item),
+      'esac'
+    ),
+
+    case_item: $ => seq(
+      rename($.word, 'argument'),
+      ')',
       repeat($._terminated_statement),
-      'done'
+      optional(';;')
     ),
 
     command: $ => seq(
@@ -149,8 +167,10 @@ module.exports = grammar({
 
     leading_word: $ => /[^\\\s#=|;:{}]+/,
 
-    word: $ => /[^#\\\s$<>{}&;]+/,
+    word: $ => /[^#\\\s$<>{}&;)]+/,
 
     comment: $ => /#.*/,
+
+    terminator: $ => choice(';', ';;', '\n'),
   }
 });

src/grammar.json

@@ -16,21 +16,8 @@
           "name": "statement"
         },
         {
-          "type": "CHOICE",
+          "type": "SYMBOL",
-          "members": [
+          "name": "terminator"
-            {
-              "type": "STRING",
-              "value": ";"
-            },
-            {
-              "type": "STRING",
-              "value": ";;"
-            },
-            {
-              "type": "STRING",
-              "value": "\n"
-            }
-          ]
         }
       ]
     },
@@ -49,6 +36,10 @@
           "type": "SYMBOL",
           "name": "if_statement"
         },
+        {
+          "type": "SYMBOL",
+          "name": "case_statement"
+        },
         {
           "type": "SYMBOL",
           "name": "pipeline"
@@ -76,6 +67,26 @@
         }
       ]
     },
+    "do_group": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "do"
+        },
+        {
+          "type": "REPEAT",
+          "content": {
+            "type": "SYMBOL",
+            "name": "_terminated_statement"
+          }
+        },
+        {
+          "type": "STRING",
+          "value": "done"
+        }
+      ]
+    },
     "if_statement": {
       "type": "SEQ",
       "members": [
@@ -163,12 +174,68 @@
         }
       ]
     },
-    "do_group": {
+    "case_statement": {
       "type": "SEQ",
       "members": [
         {
           "type": "STRING",
-          "value": "do"
+          "value": "case"
+        },
+        {
+          "type": "RENAME",
+          "content": {
+            "type": "SYMBOL",
+            "name": "word"
+          },
+          "value": "argument"
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "terminator"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": "in"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "terminator"
+        },
+        {
+          "type": "REPEAT",
+          "content": {
+            "type": "SYMBOL",
+            "name": "case_item"
+          }
+        },
+        {
+          "type": "STRING",
+          "value": "esac"
+        }
+      ]
+    },
+    "case_item": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "RENAME",
+          "content": {
+            "type": "SYMBOL",
+            "name": "word"
+          },
+          "value": "argument"
+        },
+        {
+          "type": "STRING",
+          "value": ")"
         },
         {
           "type": "REPEAT",
@@ -178,8 +245,16 @@
           }
         },
         {
-          "type": "STRING",
+          "type": "CHOICE",
-          "value": "done"
+          "members": [
+            {
+              "type": "STRING",
+              "value": ";;"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
         }
       ]
     },
@@ -566,11 +641,28 @@
     },
     "word": {
       "type": "PATTERN",
-      "value": "[^#\\\\\\s$<>{}&;]+"
+      "value": "[^#\\\\\\s$<>{}&;)]+"
     },
     "comment": {
       "type": "PATTERN",
       "value": "#.*"
+    },
+    "terminator": {
+      "type": "CHOICE",
+      "members": [
+        {
+          "type": "STRING",
+          "value": ";"
+        },
+        {
+          "type": "STRING",
+          "value": ";;"
+        },
+        {
+          "type": "STRING",
+          "value": "\n"
+        }
+      ]
     }
   },
   "extras": [
@@ -615,6 +707,7 @@
     }
   ],
   "inline": [
-    "statement"
+    "statement",
+    "terminator"
   ]
 }