Add support for shell fragments separated by comments

corpus/cmd.txt

@@ -8,7 +8,8 @@ CMD echo "test"
 
 (source_file
 	(cmd_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment))))
 
 ==================
 Shell command multiline
@@ -23,7 +24,12 @@ CMD echo "test" \
 
 (source_file
 	(cmd_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment))))
 
 ==================
 Run with shell empty array

corpus/combo.txt

@@ -19,3 +19,22 @@ COPY libsqlite3-pcre-install-alpine.sh /libsqlite3-pcre-install-alpine.sh
 		(path)
 		(path)))
 
+==================
+Run interrupted with comment
+==================
+
+RUN echo hello \
+	# comment
+	# comment2
+	world
+
+---
+
+(source_file
+	(run_instruction
+		(shell_command
+			(shell_fragment)
+			(line_continuation)
+			(comment)
+			(comment)
+			(shell_fragment))))

corpus/entrypoint.txt

@@ -8,10 +8,11 @@ ENTRYPOINT echo "test"
 
 (source_file
 	(entrypoint_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment))))
 
 ==================
-Shell command multiline
+Entrypoint Shell command multiline
 ==================
 
 ENTRYPOINT echo "test" \
@@ -23,7 +24,12 @@ ENTRYPOINT echo "test" \
 
 (source_file
 	(entrypoint_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment))))
 
 ==================
 Run with shell empty array

corpus/env.txt

@@ -57,6 +57,7 @@ ENV TEST1="foo" \
 		(env_pair
 			name: (unquoted_string)
 			value: (double_quoted_string))
+		(line_continuation)
 		(env_pair
 			name: (unquoted_string)
 			value: (unquoted_string))))

corpus/healthcheck.txt

@@ -20,7 +20,8 @@ HEALTHCHECK CMD	echo "test"
 (source_file
 	(healthcheck_instruction
 		(cmd_instruction
-			(shell_command))))
+			(shell_command
+				(shell_fragment)))))
 
 ==================
 With options
@@ -35,5 +36,6 @@ HEALTHCHECK --interval=10s --retries=10 CMD echo "test"
 		(param)
 		(param)
 		(cmd_instruction
-			(shell_command))))
+			(shell_command
+				(shell_fragment)))))
 

corpus/label.txt

@@ -43,6 +43,7 @@ LABEL key.1="value1" \
 		(label_pair
 			key: (unquoted_string)
 			value: (double_quoted_string))
+		(line_continuation)
 		(label_pair
 			key: (unquoted_string)
 			value: (double_quoted_string))))

corpus/onbuild.txt

@@ -23,4 +23,5 @@ ONBUILD RUN /usr/local/bin/python-build --dir /app/src
 (source_file
 	(onbuild_instruction
 		(run_instruction
-			(shell_command))))
+			(shell_command
+				(shell_fragment)))))

corpus/run.txt

@@ -8,7 +8,8 @@ RUN echo "test"
 
 (source_file
 	(run_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment))))
 
 ==================
 Shell command multiline
@@ -23,7 +24,12 @@ RUN echo "test" \
 
 (source_file
 	(run_instruction
-		(shell_command)))
+		(shell_command
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment)
+			(line_continuation)
+			(shell_fragment))))
 
 ==================
 Run with shell empty array

corpus/vars.txt

@@ -56,8 +56,7 @@ Env
 ENV TEST="foo$BAR" \
 	TEST_2=foo\ bar$BAZ \
 	TEST_3="foo${bar}" \
-	TEST_4=foo\ ${baz}bar \
-
+	TEST_4=foo\ ${baz}bar 
 
 ---
 
@@ -68,16 +67,19 @@ ENV TEST="foo$BAR" \
 			value: (double_quoted_string
 				(expansion
 					(variable))))
+		(line_continuation)
 		(env_pair
 			name: (unquoted_string)
 			value: (unquoted_string
 				(expansion
 					(variable))))
+		(line_continuation)
 		(env_pair
 			name: (unquoted_string)
 			value: (double_quoted_string
 				(expansion
 					(variable))))
+		(line_continuation)
 		(env_pair
 			name: (unquoted_string)
 			value: (unquoted_string

corpus/volume.txt

@@ -36,6 +36,7 @@ VOLUME /myvol1 \
 (source_file
 	(volume_instruction
 		(path)
+		(line_continuation)
 		(path)))
 
 ==================
@@ -64,4 +65,5 @@ VOLUME ["/test/myvol", \
 	(volume_instruction
 	    (string_array
 			(double_quoted_string)
+			(line_continuation)
 			(double_quoted_string))))

grammar.js

@@ -283,10 +283,27 @@ module.exports = grammar({
 				),
 
 				shell_command: $ => seq(
-						/[^\[\s].*[^\\\n]/, // TODO allow escape sequences
-						repeat(seq("\\\n", /.*[^\\\n]/)),
+						$.shell_fragment,
+						repeat(seq(
+							$.line_continuation,
+							repeat($._comment_line),
+							$.shell_fragment,
+						)),
 				),
 
+				shell_fragment: $ => repeat1(choice(
+					/[^\\\[\n#\s][^\\\[\n]*/, // non-escape or newline character
+					/\\[^\n]/,                // non-line-continuation escape
+				)),
+
+				line_continuation: $ => '\\\n',
+
+				_comment_line: $ => seq(
+					alias($._anon_comment, $.comment), '\n'
+				),
+
+				_anon_comment: $ => seq('#', /.*/),
+
 				double_quoted_string: $ => seq(
 						'"',
 						repeat(choice(

src/grammar.json

@@ -1198,8 +1198,8 @@
       "type": "SEQ",
       "members": [
         {
-          "type": "PATTERN",
-          "value": "[^\\[\\s].*[^\\\\\\n]"
+          "type": "SYMBOL",
+          "name": "shell_fragment"
         },
         {
           "type": "REPEAT",
@@ -1207,18 +1207,76 @@
             "type": "SEQ",
             "members": [
               {
-                "type": "STRING",
-                "value": "\\\n"
+                "type": "SYMBOL",
+                "name": "line_continuation"
               },
               {
-                "type": "PATTERN",
-                "value": ".*[^\\\\\\n]"
+                "type": "REPEAT",
+                "content": {
+                  "type": "SYMBOL",
+                  "name": "_comment_line"
+                }
+              },
+              {
+                "type": "SYMBOL",
+                "name": "shell_fragment"
               }
             ]
           }
         }
       ]
     },
+    "shell_fragment": {
+      "type": "REPEAT1",
+      "content": {
+        "type": "CHOICE",
+        "members": [
+          {
+            "type": "PATTERN",
+            "value": "[^\\\\\\[\\n#\\s][^\\\\\\[\\n]*"
+          },
+          {
+            "type": "PATTERN",
+            "value": "\\\\[^\\n]"
+          }
+        ]
+      }
+    },
+    "line_continuation": {
+      "type": "STRING",
+      "value": "\\\n"
+    },
+    "_comment_line": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "_anon_comment"
+          },
+          "named": true,
+          "value": "comment"
+        },
+        {
+          "type": "STRING",
+          "value": "\n"
+        }
+      ]
+    },
+    "_anon_comment": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "#"
+        },
+        {
+          "type": "PATTERN",
+          "value": ".*"
+        }
+      ]
+    },
     "double_quoted_string": {
       "type": "SEQ",
       "members": [

src/node-types.json

@@ -530,6 +530,29 @@
   {
     "type": "shell_command",
     "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "comment",
+          "named": true
+        },
+        {
+          "type": "line_continuation",
+          "named": true
+        },
+        {
+          "type": "shell_fragment",
+          "named": true
+        }
+      ]
+    }
+  },
+  {
+    "type": "shell_fragment",
+    "named": true,
     "fields": {}
   },
   {
@@ -855,10 +878,6 @@
     "type": "[",
     "named": false
   },
-  {
-    "type": "\\\n",
-    "named": false
-  },
   {
     "type": "\\ ",
     "named": false
@@ -871,6 +890,10 @@
     "type": "escape_sequence",
     "named": true
   },
+  {
+    "type": "line_continuation",
+    "named": true
+  },
   {
     "type": "variable",
     "named": true