Add "Unexpected" token type/value to errors

AlexxNica · Apr 17, 2017 · 93967e8 · 93967e8
1 parent ea9584f
commit 93967e8
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lib/nearley.js b/lib/nearley.js
@@ -314,6 +314,8 @@ Parser.prototype.feed = function(chunk) {
  if (nextColumn.states.length === 0) {
  // No states at all! This is not good.
  var message = this.lexer.formatError(token, "invalid syntax") + "\n";
+ message += "Unexpected " + (token.type ? token.type + " token: " : "");
+ message += JSON.stringify(token.value !== undefined ? token.value : token) + "\n";
  var err = new Error(message);
  err.offset = this.current;
  throw err;