Update lib/jison/lexer.js

Odd case where oldLines[?].length didn't exist, so return a length of 0 if there is no length.
Bovid · Sep 3, 2012 · 3d1a0b7 · 3d1a0b7 · zaach · Sep 10, 2012
1 parent bdc9422
commit 3d1a0b7
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/jison/lexer.js b/lib/jison/lexer.js
@@ -193,12 +193,13 @@ RegExpLexer.prototype = {
 
         if (lines.length-1) this.yylineno -= lines.length-1;
         var r = this.yylloc.range;
+        var oldLinesLength = (oldLines[oldLines.length - lines.length] ? oldLines[oldLines.length - lines.length].length : 0);
 
         this.yylloc = {first_line: this.yylloc.first_line,
           last_line: this.yylineno+1,
           first_column: this.yylloc.first_column,
           last_column: lines ?
-              (lines.length === oldLines.length ? this.yylloc.first_column : 0) + oldLines[oldLines.length - lines.length].length - lines[0].length:
+              (lines.length === oldLines.length ? this.yylloc.first_column : 0) + oldLinesLength - lines[0].length:
               this.yylloc.first_column - len
           };