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/* global Buffer */
import fs from 'fs';import test from 'ava';
import * as ohm from '../index.mjs';
// --------------------------------------------------------------------// Tests// --------------------------------------------------------------------
test('namespaces', t => {  const ns = ohm.grammars('G { start = "foo" }');  t.is(ns.G.match('foo').succeeded(), true, 'G exists in the namespace and works');
  const ns2 = ohm.grammars('ccc { foo = "foo" }', ns);  t.truthy(ns2);  t.throws(      () => {        ohm.grammar('ccc { bar = "bar" }', ns2);      },      {message: 'Grammar ccc is already declared in this namespace'},  );  t.truthy(ns2.G, 'ns2 delegates to ns1');
  const ns3 = ohm.grammars('ccc { start = "x" }', ns);  t.truthy(ns3);  t.truthy(ns3.ccc, "grammars with same name can be created in diff't namespaces");  t.not(ns3.ccc, ns2.ccc, "grammars with same name are diff't objects");  t.deepEqual(ns3.G, ns2.G, 'super grammar is the same');});
test('plain JS objects as namespaces', t => {  const ns = ohm.grammars('toString { start = "!!!" }');  t.is(ns.toString.match('!!!').succeeded(), true);
  t.truthy(ohm.grammar('G <: toString {}', ns));  t.throws(() => ohm.grammar('G <: toString {}', {}), {    message: /Grammar toString is not declared/,  });
  const toString = ohm.grammar('toString {}');  t.truthy(ohm.grammar('G <: toString {}', {toString}));  t.truthy(ohm.grammar('G <: toString {}', Object.create({toString})));
  const ns2 = {};  Object.defineProperty(ns2, 'G', {    value: ohm.grammar('G {}'),    enumerable: false,  });  t.throws(      () => ohm.grammar('G2 <: G {}', ns2),      {message: /Grammar G is not declared/},      'an own, non-enumerable property is ignored',  );});
test('instantiating grammars from different types of objects', t => {  let g = ohm.grammar(fs.readFileSync('test/arithmetic.ohm'));  t.is(g.match('1+2').succeeded(), true, 'works with a Buffer from fs.readFileSync()');
  g = ohm.grammar(Buffer.from('G {}'));  t.is(g.match('a', 'letter').succeeded(), true, 'works with a new Buffer');
  // Try with some objects where 'toString' won't work.  t.throws(      () => {        ohm.grammar({toString: 3});      },      {message: 'Expected string as first argument, got [object Object]'},      'object with invalid toString',  );  t.throws(      () => {        ohm.grammar(Object.create(null));      },      {message: 'Expected string as first argument, got [object Object]'},      'object with no toString',  );
  t.throws(      () => {        ohm.grammar([1, 2]);      },      {message: 'Expected string as first argument, got Array: "1,2"'},      'Array with valid toString',  );
  function Foo() {    this.toString = function() {      return 'Foo!';    };  }  t.throws(      () => {        ohm.grammar(new Foo());      },      {message: 'Expected string as first argument, got Foo: "Foo!"'},      'Custom objects with toString',  );});