Merge pull request #39 from kmicklas/quoted-label-keys

Support quoted LABEL keys

corpus/label.txt

@@ -93,5 +93,17 @@ USER foo$FOO:bar$BAR
 		group: (unquoted_string
 			(expansion
 				(variable)))))
-		
 
+==================
+Quoted key
+==================
+
+LABEL "key"="value"
+
+---
+
+(source_file
+	(label_instruction
+		(label_pair
+			key: (double_quoted_string)
+			value: (double_quoted_string))))

grammar.js

@@ -255,7 +255,11 @@ module.exports = grammar({
 
     label_pair: ($) =>
       seq(
-        field("key", alias(/[-a-zA-Z0-9\._]+/, $.unquoted_string)),
+        field("key", choice(
+          alias(/[-a-zA-Z0-9\._]+/, $.unquoted_string),
+          $.double_quoted_string,
+          $.single_quoted_string
+        )),
         token.immediate("="),
         field("value",
               choice(

src/node-types.json

@@ -424,6 +424,14 @@
         "multiple": false,
         "required": true,
         "types": [
+          {
+            "type": "double_quoted_string",
+            "named": true
+          },
+          {
+            "type": "single_quoted_string",
+            "named": true
+          },
           {
             "type": "unquoted_string",
             "named": true