JavaScript Highlighter: Fix numbers starting with dot

MongoView/Synax Highlighting/JavaScriptHighlighter.swift

@@ -295,8 +295,19 @@ class JavaScriptHighlighter {
     
     private func consumeDotLookup() {
         consume() // .
-        print("Dot lookup")
-        emit(token: .punctuation, range: prevCharRange())
+        guard let char = peek() else { return }
+        if identifierStarts.contains(char) {
+            print("Dot lookup")
+            emit(token: .punctuation, range: prevCharRange())
+            consumeIdentifier()
+        } else if CharacterSet.decimalDigits.contains(char) {
+            let numberStart = text.index(before: currentIndex)
+            while let char = peek(), CharacterSet.decimalDigits.contains(char) {
+                consume()
+            }
+            print("Number: \(text[numberStart..<currentIndex])")
+            emit(token: .number, range: range(from: numberStart, to: currentIndex))
+        }
     }
     
     private func consumeArray() {

jstest/main.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-let source = "`$foo ${blah} bar`"
+let source = ".1 + .2"
 let highlighter = JavaScriptHighlighter(text: source)
 highlighter.debug = true
 highlighter.highlight()