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/**
* This is the ParseError class, which is the main error thrown by KaTeX
* functions when something has gone wrong. This is used to distinguish internal
* errors from errors in the expression that the user provided.
*/
function ParseError(message, lexer, position) {
var error = "KaTeX parse error: " + message;
if (lexer !== undefined && position !== undefined) {
// If we have the input and a position, make the error a bit fancier
// Prepend some information
error += " at position " + position + ": ";
// Get the input
var input = lexer._input;
// Insert a combining underscore at the correct position
input = input.slice(0, position) + "\u0332" +
input.slice(position);
// Extract some context from the input and add it to the error
var begin = Math.max(0, position - 15);
var end = position + 15;
error += input.slice(begin, end);
}
// Some hackery to make ParseError a prototype of Error
// See http://stackoverflow.com/a/8460753
var self = new Error(error);
self.name = "ParseError";
self.__proto__ = ParseError.prototype;
self.position = position;
return self;
}
// More hackery
ParseError.prototype.__proto__ = Error.prototype;
module.exports = ParseError;
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