Function ParseError

static/katex/katex.js:215–268

(message, // The error message
token)

 */
var ParseError = // Error position based on passed-in Token or ParseNode.
function ParseError(message, // The error message
token) // An object providing position information
{
  this.position = void 0;
  var error = "KaTeX parse error: " + message;
  var start;
  var loc = token && token.loc;

  if (loc && loc.start <= loc.end) {
    // If we have the input and a position, make the error a bit fancier
    // Get the input
    var input = loc.lexer.input; // Prepend some information

    start = loc.start;
    var end = loc.end;

    if (start === input.length) {
      error += " at end of input: ";
    } else {
      error += " at position " + (start + 1) + ": ";
    } // Underline token in question using combining underscores


    var underlined = input.slice(start, end).replace(/[^]/g, "$&\u0332"); // Extract some context from the input and add it to the error

    var left;

    if (start > 15) {
      left = "…" + input.slice(start - 15, start);
    } else {
      left = input.slice(0, start);
    }

    var right;

    if (end + 15 < input.length) {
      right = input.slice(end, end + 15) + "…";
    } else {
      right = input.slice(end);
    }

    error += left + underlined + right;
  } // Some hackery to make ParseError a prototype of Error
  // See http://stackoverflow.com/a/8460753


  var self = new Error(error);
  self.name = "ParseError"; // $FlowFixMe

  self.__proto__ = ParseError.prototype; // $FlowFixMe

  self.position = start;
  return self;
}; // $FlowFixMe More hackery


ParseError.prototype.__proto__ = Error.prototype;