Use custom TranslatorErrors

Author: Fidget-Spinner

src/errors.ts

@@ -215,4 +215,30 @@ export namespace ResolverErrors {
             this.name = "NameReassignmentError";
         }
     }
+}
+
+export namespace TranslatorErrors {
+    export class BaseTranslatorError extends SyntaxError {
+        line: number;
+        col: number;
+        loc: Position;
+
+        constructor(message: string, line: number, col: number) {
+            super(`BaseTranslatorError at line ${line} column ${col-1}
+                   ${message}`);
+            this.line = line;
+            this.col = col;
+            this.name = "BaseTranslatorError";
+            this.loc = toEstreeLocation(line, col, 0);
+        }
+    }
+    export class UnsupportedOperator extends BaseTranslatorError {
+        constructor(line: number, col: number, source: string, start: number) {
+            let msg = getFullLine(source, start) + "\n";
+            let hint = `^ This operator is not yet supported by us.`;
+            hint = hint.padStart(hint.length + col - MAGIC_OFFSET, " ");
+            super(msg + hint, line, col);
+            this.name = "UnsupportedOperator";
+        }
+    }
 }

src/translator.ts

@@ -39,6 +39,7 @@ import {
     VariableDeclarator,
     WhileStatement
 } from "estree";
+import {TranslatorErrors} from "./errors";
 
 export interface EstreePosition {
     line: number;
@@ -435,7 +436,7 @@ export class Translator implements StmtNS.Visitor<BaseNode>, ExprNS.Visitor<Base
             // @TODO double slash and power needs to convert to math exponent/floor divide
             case TokenType.DOUBLESLASH:
             case TokenType.DOUBLESTAR:
-                throw new Error("This operator is not yet supported");
+                throw new TranslatorErrors.UnsupportedOperator(expr.operator.line, expr.operator.col, this.source, expr.operator.indexInSource);
             default:
                 throw new Error("Unreachable binary code path in translator");
         }
@@ -476,7 +477,7 @@ export class Translator implements StmtNS.Visitor<BaseNode>, ExprNS.Visitor<Base
             case TokenType.ISNOT:
             case TokenType.IN:
             case TokenType.NOTIN:
-                throw new Error("This operator is not yet supported");
+                throw new TranslatorErrors.UnsupportedOperator(expr.operator.line, expr.operator.col, this.source, expr.operator.indexInSource);
             default:
                 throw new Error("Unreachable binary code path in translator");
         }