fix(column_heading): alwasy check 0 columned

Fixes #5

Author: vigoux

corpus/code_block.txt

@@ -7,8 +7,7 @@ Simple code block
 --------------------------------------------------------------------------------
 
 (help_file
-  (line
-    (code_block)))
+  (code_block))
 
 ================================================================================
 Code block with text before
@@ -34,6 +33,65 @@ Blehke
 --------------------------------------------------------------------------------
 
 (help_file
+  (code_block)
   (line
-    (code_block)
     (word)))
+
+================================================================================
+Strange codeblock
+================================================================================
+
+Note that in the command: >
+	:if "foo"
+	:" NOT executed
+"foo" is converted to 0, which means FALSE.  If the string starts with a
+non-zero number it means TRUE: >
+	:if "8foo"
+	:" executed
+To test for a non-empty string, use empty(): >
+	:if !empty("foo")
+<
+
+--------------------------------------------------------------------------------
+
+(help_file
+  (line
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (code_block))
+  (line
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word))
+  (line
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (code_block))
+  (line
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (word)
+    (code_block)))

grammar.js

@@ -12,7 +12,7 @@ module.exports = grammar({
 
   rules: {
     help_file: ($) =>
-      repeat1(choice($.line, '\n', $.column_heading, $.headline)),
+      repeat1(choice($.line, '\n', $.column_heading, $.headline, $.code_block)),
 
     headline: ($) =>
       seq(
@@ -22,13 +22,12 @@ module.exports = grammar({
         '\n',
       ),
 
-    line: ($) => prec.right(seq(repeat1($._atom), optional('\n'))),
+    line: ($) => prec.right(seq(repeat1($._atom), optional($.code_block), optional('\n'))),
 
     _atom: ($) =>
       choice(
         $.word,
         $.tag,
-        $.code_block,
         $.tag,
         $.option,
         $.hotlink,

src/grammar.json

@@ -21,6 +21,10 @@
           {
             "type": "SYMBOL",
             "name": "headline"
+          },
+          {
+            "type": "SYMBOL",
+            "name": "code_block"
           }
         ]
       }
@@ -84,6 +88,18 @@
               "name": "_atom"
             }
           },
+          {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "code_block"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          },
           {
             "type": "CHOICE",
             "members": [
@@ -110,10 +126,6 @@
           "type": "SYMBOL",
           "name": "tag"
         },
-        {
-          "type": "SYMBOL",
-          "name": "code_block"
-        },
         {
           "type": "SYMBOL",
           "name": "tag"

src/node-types.json

@@ -88,6 +88,10 @@
       "multiple": true,
       "required": false,
       "types": [
+        {
+          "type": "code_block",
+          "named": true
+        },
         {
           "type": "column_heading",
           "named": true