feat: Create external scanner stub.

binding.gyp

@@ -8,6 +8,7 @@
       ],
       "sources": [
         "src/parser.c",
+        "src/scanner.c",
         "bindings/node/binding.cc"
       ],
       "cflags_c": [

bindings/rust/build.rs

@@ -10,14 +10,9 @@ fn main() {
     let parser_path = src_dir.join("parser.c");
     c_config.file(&parser_path);
 
-    // If your language uses an external scanner written in C,
-    // then include this block of code:
-
-    /*
     let scanner_path = src_dir.join("scanner.c");
     c_config.file(&scanner_path);
     println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
-    */
 
     c_config.compile("parser");
     println!("cargo:rerun-if-changed={}", parser_path.to_str().unwrap());

grammar.js

@@ -15,9 +15,14 @@ const PREC = {
 module.exports = grammar({
   name: 'GAP',
 
+  externals: $ => [
+    $.line_continuation
+  ],
+
   extras: $ => [
     $.comment,
     /\s/,
+    $.line_continuation,
   ],
 
   inline: $ => [

src/grammar.json

@@ -2258,6 +2258,10 @@
     {
       "type": "PATTERN",
       "value": "\\s"
+    },
+    {
+      "type": "SYMBOL",
+      "name": "line_continuation"
     }
   ],
   "conflicts": [
@@ -2271,7 +2275,12 @@
     ]
   ],
   "precedences": [],
-  "externals": [],
+  "externals": [
+    {
+      "type": "SYMBOL",
+      "name": "line_continuation"
+    }
+  ],
   "inline": [
     "_expression",
     "_statement"

src/node-types.json

@@ -4208,6 +4208,10 @@
     "type": "integer",
     "named": true
   },
+  {
+    "type": "line_continuation",
+    "named": true
+  },
   {
     "type": "local",
     "named": false