grammar: add link and tooltip attributes

Closes #18

grammar.js

@@ -190,6 +190,8 @@ module.exports = grammar({
         choice(
           "shape",
           "label",
+          "link",
+          "tooltip",
           // sql
           "constraint",
           // image

src/grammar.json

@@ -777,6 +777,14 @@
             "type": "STRING",
             "value": "label"
           },
+          {
+            "type": "STRING",
+            "value": "link"
+          },
+          {
+            "type": "STRING",
+            "value": "tooltip"
+          },
           {
             "type": "STRING",
             "value": "constraint"
@@ -1286,14 +1294,26 @@
       }
     },
     "_unquoted_string": {
-      "type": "TOKEN",
+      "type": "REPEAT1",
       "content": {
-        "type": "PREC",
-        "value": -1,
-        "content": {
-          "type": "PATTERN",
-          "value": "[^'\"`|\\n\\s;{}]([^\\n;{}]*[^\\n\\s;{}])?"
-        }
+        "type": "CHOICE",
+        "members": [
+          {
+            "type": "SYMBOL",
+            "name": "escape_sequence"
+          },
+          {
+            "type": "TOKEN",
+            "content": {
+              "type": "PREC",
+              "value": -1,
+              "content": {
+                "type": "PATTERN",
+                "value": "[^'\"`\\\\|\\n\\s;{}]([^\\\\\\n;{}]*[^\\\\\\n\\s;{}])?"
+              }
+            }
+          }
+        ]
       }
     },
     "string": {

src/node-types.json

@@ -19,13 +19,17 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": false,
+      "multiple": true,
       "required": false,
       "types": [
         {
           "type": "boolean",
           "named": true
         },
+        {
+          "type": "escape_sequence",
+          "named": true
+        },
         {
           "type": "float",
           "named": true
@@ -202,9 +206,13 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": false,
+      "multiple": true,
       "required": false,
       "types": [
+        {
+          "type": "escape_sequence",
+          "named": true
+        },
         {
           "type": "string",
           "named": true
@@ -476,6 +484,10 @@
     "type": "target-arrowhead",
     "named": false
   },
+  {
+    "type": "tooltip",
+    "named": false
+  },
   {
     "type": "true",
     "named": false

test/corpus/attributes.txt

@@ -125,6 +125,8 @@ foo: {
   icon: pathto
   width: 100
   height: 200
+  link: https://microsoft.com
+  tooltip: Gee, I feel kind of LIGHT in the head now,\nknowing I can't make my satellite dish PAYMENTS!
 }
 
 --------------------------------------------------------------------------------
@@ -139,6 +141,8 @@ foo: {
       (attribute (attr_key) (attr_value))
       (attribute (attr_key) (attr_value (integer)))
       (attribute (attr_key) (attr_value (integer)))
+      (attribute (attr_key) (attr_value))
+      (attribute (attr_key) (attr_value (escape_sequence)))
     )
   )
 )

test/corpus/shape.txt

@@ -103,6 +103,21 @@ a: Foo Bar; b: Biz Baz
   (shape (shape_key) (label))
 )
 
+================================================================================
+Label with escape sequence
+================================================================================
+a: Foo\nB\#ar
+a: Foo\nB\@r; b: Biz\nBaz
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (shape (shape_key) (label (escape_sequence) (escape_sequence)))
+  (shape (shape_key) (label (escape_sequence) (escape_sequence)))
+  (shape (shape_key) (label (escape_sequence)))
+)
+
+
 ================================================================================
 It should skip white spaces
 ================================================================================

test/highlight/attribute.d2

@@ -26,7 +26,6 @@ foo: Label {
   #     ^ property 
 }
 
-
 foo: {
   style: {
     opacity: 0.5
@@ -43,3 +42,18 @@ foo: {
     #         ^ boolean
   }
 }
+
+foo: Label {
+  tooltip: Gee, I feel kind of LIGHT in the head now,\nknowing I can't make my satellite dish PAYMENTS!
+  # <- property
+  #        ^ string
+  #                                                  ^ string.escape
+
+  link: https://microsoft.com
+  # <- property
+  #     ^ string
+
+  style.fill: red
+  # <- property
+  #     ^ property 
+}

test/highlight/shape.d2

@@ -35,3 +35,10 @@ foo: Foo Bar {
   #   ^ variable
 }
 # <- punctuation.bracket
+
+foo: Foo\#Ba\@r {
+  #  ^ text.title
+  #      ^ string.escape
+  #       ^ text.title
+  #          ^ string.escape
+}