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'use strict';
// --------------------------------------------------------------------// Private stuff// --------------------------------------------------------------------
/*  `Failure`s represent expressions that weren't matched while parsing. They are used to generate  error messages automatically. The interface of `Failure`s includes the collowing methods:
  - getText() : String  - getType() : String  (one of {"description", "string", "code"})  - isDescription() : bool  - isStringTerminal() : bool  - isCode() : bool  - isFluffy() : bool  - makeFluffy() : void  - subsumes(Failure) : bool*/
function isValidType(type) {  return type === 'description' || type === 'string' || type === 'code';}
function Failure(pexpr, text, type) {  if (!isValidType(type)) {    throw new Error('invalid Failure type: ' + type);  }  this.pexpr = pexpr;  this.text = text;  this.type = type;  this.fluffy = false;}
Failure.prototype.getPExpr = function() {  return this.pexpr;};
Failure.prototype.getText = function() {  return this.text;};
Failure.prototype.getType = function() {  return this.type;};
Failure.prototype.isDescription = function() {  return this.type === 'description';};
Failure.prototype.isStringTerminal = function() {  return this.type === 'string';};
Failure.prototype.isCode = function() {  return this.type === 'code';};
Failure.prototype.isFluffy = function() {  return this.fluffy;};
Failure.prototype.makeFluffy = function() {  this.fluffy = true;};
Failure.prototype.clearFluffy = function() {  this.fluffy = false;};
Failure.prototype.subsumes = function(that) {  return (    this.getText() === that.getText() &&    this.type === that.type &&    (!this.isFluffy() || (this.isFluffy() && that.isFluffy()))  );};
Failure.prototype.toString = function() {  return this.type === 'string' ? JSON.stringify(this.getText()) : this.getText();};
Failure.prototype.clone = function() {  const failure = new Failure(this.pexpr, this.text, this.type);  if (this.isFluffy()) {    failure.makeFluffy();  }  return failure;};
Failure.prototype.toKey = function() {  return this.toString() + '#' + this.type;};
// --------------------------------------------------------------------// Exports// --------------------------------------------------------------------
module.exports = Failure;