Override error routines in parser

src/main/cup/parser.cup

@@ -1,5 +1,33 @@
 package parse;
 
+import error.ErrorManager;
+import java_cup.runtime.Symbol;
+import java_cup.runtime.ComplexSymbolFactory.ComplexSymbol;
+
+parser code {:
+  /* override error routines */
+  private Loc locOfInfo(Object info) {
+     return info instanceof ComplexSymbol ?
+               Loc.loc((ComplexSymbol) info) :
+               info instanceof Symbol ?
+                  Loc.loc((Symbol) info) :
+                  Loc.loc(cur_token);
+  }
+  private String lexemeOfInfo(Object info) {
+     return info instanceof ComplexSymbol ?
+               " at '" + ((ComplexSymbol) info).getName() + "'" :
+               "";
+
+  }
+  public void report_fatal_error(String message, Object info) {
+     done_parsing();
+     ErrorManager.em.fatal(locOfInfo(info), message + lexemeOfInfo(info) + "\nCan't recover from previous error(s), giving up.");
+  }
+  public void report_error(String message, Object info) {
+     ErrorManager.em.error(locOfInfo(info), message + lexemeOfInfo(info));
+  }
+:};
+
 terminal LITNUM;
 terminal PLUS, MINUS, TIMES, DIV;
 terminal LPAREN, RPAREN;