Add TypeScript port.

The type casting code does not work in typescript. Assuming structure is correct for "true" case.

cpp/TypeScript/CPP14ParserBase.ts

@@ -0,0 +1,28 @@
+import {Parser, Lexer, Token, TokenStream, ParserRuleContext} from "antlr4";
+import CPP14Parser from './CPP14Parser';
+import ParametersAndQualifiersContext from './CPP14Parser';
+
+export default abstract class CPP14ParserBase extends Parser {
+
+    constructor(input: TokenStream) {
+        super(input);
+    }
+
+    protected IsPureSpecifierAllowed() : boolean {
+        try {
+            var x = this._ctx; // memberDeclarator
+            var c = (x.children[0] as ParserRuleContext).children[0] as ParserRuleContext;
+            var c2 = c.children[0] as ParserRuleContext;
+            var p = c2.children[1] as ParserRuleContext;
+	    if (p == undefined)
+		return false;
+//	    console.log("P " + p);
+//	    var q = p.constructor === ParametersAndQualifiersContext;
+	    var q = p instanceof ParametersAndQualifiersContext;
+//	    console.log("Q " + q);
+	    return true;
+        } catch (e) {
+        }
+        return false;
+    }
+}

cpp/desc.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <desc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../_scripts/desc.xsd">
-   <targets>Cpp;CSharp;Dart;Java;JavaScript;Python3</targets>
+   <targets>Cpp;CSharp;Dart;Java;JavaScript;Python3;TypeScript</targets>
 </desc>