Add escaped newlines

corpus/programs.txt

@@ -10,3 +10,33 @@ Comments
 (program
   (comment)
   (comment))
+
+===============================
+Escaped newlines
+===============================
+
+abc \
+  d \
+  e
+
+f=g   \
+  h=i \
+  j   \
+  --k
+
+---
+
+(program
+  (command (simple_command
+    (command_name)
+    (argument)
+    (argument)))
+  (command (simple_command
+    (environment_variable_assignment
+      (variable_name)
+      (argument))
+    (environment_variable_assignment
+      (variable_name)
+      (argument))
+    (command_name)
+    (argument))))

grammar.js

@@ -12,7 +12,7 @@ module.exports = grammar({
 
   extras: $ => [
     $.comment,
-    /\s/
+    token(choice(/\s/, '\\\n')),
   ],
 
   rules: {
@@ -116,9 +116,9 @@ module.exports = grammar({
 
     file_descriptor: $ => token(prec(1, /\d+/)),
 
-    leading_word: $ => /[^\s#=|;:{}]+/,
+    leading_word: $ => /[^\\\s#=|;:{}]+/,
 
-    word: $ => /[^# \s$<>{}&]+/,
+    word: $ => /[^#\\\s$<>{}&]+/,
 
     control_operator: $ => choice(
       '\n',

src/grammar.json

@@ -435,11 +435,11 @@
     },
     "leading_word": {
       "type": "PATTERN",
-      "value": "[^\\s#=|;:{}]+"
+      "value": "[^\\\\\\s#=|;:{}]+"
     },
     "word": {
       "type": "PATTERN",
-      "value": "[^# \\s$<>{}&]+"
+      "value": "[^#\\\\\\s$<>{}&]+"
     },
     "control_operator": {
       "type": "CHOICE",
@@ -464,9 +464,21 @@
       "type": "SYMBOL",
       "name": "comment"
     },
+    {
+      "type": "TOKEN",
+      "content": {
+        "type": "CHOICE",
+        "members": [
           {
             "type": "PATTERN",
             "value": "\\s"
+          },
+          {
+            "type": "STRING",
+            "value": "\\\n"
+          }
+        ]
+      }
     }
   ],
   "conflicts": [],