implement link

src/parser.pegjs

@@ -157,6 +157,7 @@ inline
 	/ mathInline
 	/ hashtag
 	/ url
+	/ link
 	/ text
 
 // inline: emoji
@@ -307,6 +308,23 @@ urlBracketPair
 	= "(" urlContentPart* ")"
 	/ "[" urlContentPart* "]"
 
+// inline: link
+
+link
+	= silent:"?"? "[" label:linkLabel "](" url:$(url) ")"
+{
+	return createNode('link', {
+		silent: (silent != null),
+		url: url
+	}, mergeText(label));
+}
+
+linkLabel
+	= (!"]" n:inline { return n; })+
+
+linkUrl
+	= url { return text(); }
+
 // inline: text
 
 text