feat: add support for code blocks

Author: vigoux

corpus/code_block.txt

@@ -0,0 +1,39 @@
+================================================================================
+Simple code block
+================================================================================
+>
+  abcabcabc
+<
+--------------------------------------------------------------------------------
+
+(help_file
+  (line
+    (code_block)))
+
+================================================================================
+Code block with text before
+================================================================================
+This code: >
+  abc
+<
+--------------------------------------------------------------------------------
+
+(help_file
+  (line
+    (word)
+    (word)
+    (code_block)))
+
+================================================================================
+Code block with implicit stop
+================================================================================
+>
+  abc
+
+Blehke
+--------------------------------------------------------------------------------
+
+(help_file
+  (line
+    (code_block)
+    (word)))

grammar.js

@@ -6,14 +6,18 @@ module.exports = grammar({
     [$._atom, $.column_name],
   ],
 
+  externals: ($) => [
+    $.code_block
+  ],
+
   rules: {
     help_file: ($) => repeat1(choice($.line, '\n', $.column_heading)),
 
     header: ($) => seq($.tag),
 
     line: ($) => prec.right(seq(repeat1($._atom), optional('\n'))),
 
-    _atom: ($) => choice($.word, $.tag),
+    _atom: ($) => choice($.word, $.tag, $.code_block),
 
     uppercase_name: ($) => repeat1(/[A-Z]+/),
     column_name: ($) => repeat1($.word),

src/grammar.json

@@ -68,6 +68,10 @@
         {
           "type": "SYMBOL",
           "name": "tag"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "code_block"
         }
       ]
     },
@@ -222,7 +226,12 @@
     ]
   ],
   "precedences": [],
-  "externals": [],
+  "externals": [
+    {
+      "type": "SYMBOL",
+      "name": "code_block"
+    }
+  ],
   "inline": [],
   "supertypes": []
 }

src/node-types.json

@@ -71,6 +71,10 @@
       "multiple": true,
       "required": true,
       "types": [
+        {
+          "type": "code_block",
+          "named": true
+        },
         {
           "type": "tag",
           "named": true
@@ -115,6 +119,10 @@
     "type": "*",
     "named": false
   },
+  {
+    "type": "code_block",
+    "named": true
+  },
   {
     "type": "word",
     "named": true