support empty lines

examples/test.txt

@@ -1,3 +1,6 @@
-foo.shape: 'oval'
+
-foo.bar.baz.shape: oval
+
+foo
+
+bar   :  Foo Bar;     baz
 

grammar.js

@@ -9,7 +9,8 @@ module.exports = grammar({
   rules: {
     source_file: ($) => repeat($._definition),
 
-    _definition: ($) => choice($._root_attribute, $.connection, $.shape),
+    _definition: ($) =>
+      choice($._end, $._root_attribute, $.connection, $.shape),
 
     connection: ($) =>
       seq(
@@ -108,8 +109,6 @@ module.exports = grammar({
 
     _colon: ($) => seq(repeat(" "), ":", repeat(" ")),
 
-    _dash: ($) => token.immediate("-"),
-
     _word: ($) => /[\w\d]+/,
 
     arrow: ($) =>
@@ -122,6 +121,8 @@ module.exports = grammar({
         )
       ),
 
+    _dash: ($) => token.immediate("-"),
+
     _unquoted_string: ($) => token.immediate(/[^'"`\n;{]+/),
 
     string: ($) =>
@@ -132,7 +133,7 @@ module.exports = grammar({
       ),
 
     _eof: ($) => choice("\n", "\0"),
-    _end: ($) => choice(";", $._eof),
+    _end: ($) => seq(repeat(" "), choice(";", $._eof)),
 
     dot: ($) => ".",
   },

src/grammar.json

@@ -12,6 +12,10 @@
     "_definition": {
       "type": "CHOICE",
       "members": [
+        {
+          "type": "SYMBOL",
+          "name": "_end"
+        },
         {
           "type": "SYMBOL",
           "name": "_root_attribute"
@@ -520,13 +524,6 @@
         }
       ]
     },
-    "_dash": {
-      "type": "IMMEDIATE_TOKEN",
-      "content": {
-        "type": "STRING",
-        "value": "-"
-      }
-    },
     "_word": {
       "type": "PATTERN",
       "value": "[\\w\\d]+"
@@ -608,6 +605,13 @@
         ]
       }
     },
+    "_dash": {
+      "type": "IMMEDIATE_TOKEN",
+      "content": {
+        "type": "STRING",
+        "value": "-"
+      }
+    },
     "_unquoted_string": {
       "type": "IMMEDIATE_TOKEN",
       "content": {
@@ -703,15 +707,27 @@
       ]
     },
     "_end": {
-      "type": "CHOICE",
+      "type": "SEQ",
       "members": [
         {
-          "type": "STRING",
+          "type": "REPEAT",
-          "value": ";"
+          "content": {
+            "type": "STRING",
+            "value": " "
+          }
         },
         {
-          "type": "SYMBOL",
+          "type": "CHOICE",
-          "name": "_eof"
+          "members": [
+            {
+              "type": "STRING",
+              "value": ";"
+            },
+            {
+              "type": "SYMBOL",
+              "name": "_eof"
+            }
+          ]
         }
       ]
     },

test/corpus/shape.txt

@@ -67,3 +67,19 @@ a: Foo Bar; b: Biz Baz
   (shape (identifier) (label))
 )
 
+================================================================================
+It should skip white spaces
+================================================================================
+
+foo
+
+bar   :  Foo Bar;     baz
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (shape (identifier))
+  (shape (identifier) (label))
+  (shape (identifier))
+)
+