Document pipe operator method calls

Author: Sainan

docs/New Operators.md

@@ -174,6 +174,23 @@ producer()
 |> print --> 16
 ```
 
+### Methods Calls
+There is specialized syntax for method calls with the pipe operator, too:
+```pluto
+local producer = || -> 21
+
+local obj = {
+    function multiply(value)
+        return value * self.factor
+    end
+}
+obj.factor = 2
+
+producer()
+|> obj:multiply
+|> print --> 42
+```
+
 ### Anonymous Functions
 The righthand side of the pipe operator can also be an anonymous function, allowing for more advanced usage like this:
 ```pluto

src/theme/pluto.js

@@ -5,7 +5,7 @@ Prism.languages.pluto = {
 		/\b(?!in\s)(?!\d)(?!return)(?!case)(?!function)(?!local)(?!new)\w+(?=\s*(?:\??\())/, // func()
 		/\b(?!in\s)(?!\d)(?!return)(?!case)(?!function)(?!local)(?!not)\w+(?=\s*(?:\??[{"]))/, // func "", func {}
 		/\b(?!in\s)(?!\d)(?!return)(?!case)(?!function)(?!local)(?!not)\w+(?=\s*(?:\??\[\[))/, // func [[
-		/(?<=\|>)\s[\w.]+/, // |> func
+		/(?<=\|>)\s[\w.:]+/, // |> func
 		/\b(function|enum|class)\b/,
 		/\b(os\.platform|json\.null|json\.withnull|json\.withorder)\b/, // standard library constants
 		/\b(debug|table|string|number|io|os|coroutine|_VERSION|_PVERSION|_PSOUP)\b/, // standard library + type hints