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'use strict';
// --------------------------------------------------------------------// Imports// --------------------------------------------------------------------
const Failure = require('./Failure');const common = require('./common');const pexprs = require('./pexprs-main');
// --------------------------------------------------------------------// Operations// --------------------------------------------------------------------
pexprs.PExpr.prototype.toFailure = common.abstract('toFailure');
pexprs.any.toFailure = function(grammar) {  return new Failure(this, 'any object', 'description');};
pexprs.end.toFailure = function(grammar) {  return new Failure(this, 'end of input', 'description');};
pexprs.Terminal.prototype.toFailure = function(grammar) {  return new Failure(this, this.obj, 'string');};
pexprs.Range.prototype.toFailure = function(grammar) {  // TODO: come up with something better  return new Failure(this, JSON.stringify(this.from) + '..' + JSON.stringify(this.to), 'code');};
pexprs.Not.prototype.toFailure = function(grammar) {  const description =    this.expr === pexprs.any ? 'nothing' : 'not ' + this.expr.toFailure(grammar);  return new Failure(this, description, 'description');};
pexprs.Lookahead.prototype.toFailure = function(grammar) {  return this.expr.toFailure(grammar);};
pexprs.Apply.prototype.toFailure = function(grammar) {  let {description} = grammar.rules[this.ruleName];  if (!description) {    const article = /^[aeiouAEIOU]/.test(this.ruleName) ? 'an' : 'a';    description = article + ' ' + this.ruleName;  }  return new Failure(this, description, 'description');};
pexprs.UnicodeChar.prototype.toFailure = function(grammar) {  return new Failure(this, 'a Unicode [' + this.category + '] character', 'description');};
pexprs.Alt.prototype.toFailure = function(grammar) {  const fs = this.terms.map(t => t.toFailure(grammar));  const description = '(' + fs.join(' or ') + ')';  return new Failure(this, description, 'description');};
pexprs.Seq.prototype.toFailure = function(grammar) {  const fs = this.factors.map(f => f.toFailure(grammar));  const description = '(' + fs.join(' ') + ')';  return new Failure(this, description, 'description');};
pexprs.Iter.prototype.toFailure = function(grammar) {  const description = '(' + this.expr.toFailure(grammar) + this.operator + ')';  return new Failure(this, description, 'description');};