goog.provide('ol.test.expression');


describe('ol.expr.parse()', function() {

  it('parses a subset of ECMAScript 5.1 expressions', function() {
    var expr = ol.expr.parse('foo');
    expect(expr).to.be.a(ol.expr.Expression);
  });

  describe('11.1 - primary expressions', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.1

    it('parses identifier expressions', function() {
      var expr = ol.expr.parse('foo');
      expect(expr).to.be.a(ol.expr.Identifier);
      expect(expr.evaluate({foo: 'bar'})).to.be('bar');
    });

    it('consumes whitespace as expected', function() {
      var expr = ol.expr.parse('  foo  ');
      expect(expr).to.be.a(ol.expr.Identifier);
      expect(expr.evaluate({foo: 'bar'})).to.be('bar');
    });

    it('throws on invalid identifier expressions', function() {
      expect(function() {
        ol.expr.parse('3foo');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('f');
        expect(token.index).to.be(1);
      });
    });

    it('parses string literal expressions', function() {
      var expr = ol.expr.parse('"foo"');
      expect(expr).to.be.a(ol.expr.Literal);
      expect(expr.evaluate()).to.be('foo');
    });

    it('throws on unterminated string', function() {
      expect(function() {
        ol.expr.parse('"foo');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.type).to.be(ol.expr.TokenType.EOF);
        expect(token.index).to.be(4);
      });
    });

    it('parses numeric literal expressions', function() {
      var expr = ol.expr.parse('.42e+2');
      expect(expr).to.be.a(ol.expr.Literal);
      expect(expr.evaluate()).to.be(42);
    });

    it('throws on invalid number', function() {
      expect(function() {
        ol.expr.parse('.42eX');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('X');
        expect(token.index).to.be(4);
      });
    });

    it('parses boolean literal expressions', function() {
      var expr = ol.expr.parse('false');
      expect(expr).to.be.a(ol.expr.Literal);
      expect(expr.evaluate()).to.be(false);
    });

    it('parses null literal expressions', function() {
      var expr = ol.expr.parse('null');
      expect(expr).to.be.a(ol.expr.Literal);
      expect(expr.evaluate()).to.be(null);
    });

  });

  describe('11.2 - left-hand-side expressions', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.2

    it('parses member expressions with dot notation', function() {
      var expr = ol.expr.parse('foo.bar.baz');
      expect(expr).to.be.a(ol.expr.Member);
      var scope = {foo: {bar: {baz: 42}}};
      expect(expr.evaluate(scope)).to.be(42);
    });

    it('consumes whitespace as expected', function() {
      var expr = ol.expr.parse(' foo . bar . baz ');
      expect(expr).to.be.a(ol.expr.Member);
      var scope = {foo: {bar: {baz: 42}}};
      expect(expr.evaluate(scope)).to.be(42);
    });

    it('throws on invalid member expression', function() {
      expect(function() {
        ol.expr.parse('foo.4bar');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('b');
        expect(token.index).to.be(5);
      });
    });

    it('parses call expressions with literal arguments', function() {
      var expr = ol.expr.parse('foo(42, "bar")');
      expect(expr).to.be.a(ol.expr.Call);
      var scope = {
        foo: function(num, str) {
          expect(num).to.be(42);
          expect(str).to.be('bar');
          return str + num;
        }
      };
      expect(expr.evaluate(scope)).to.be('bar42');
    });

    it('throws on calls with unterminated arguments', function() {
      expect(function() {
        ol.expr.parse('foo(42,)');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be(')');
        expect(token.index).to.be(7);
      });
    });

  });

  describe('11.3 - postfix expressions', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.3
    it('not supported');
  });


  describe('11.4 - unary operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.4

    it('parses logical not operator', function() {
      var expr = ol.expr.parse('!foo');
      expect(expr).to.be.a(ol.expr.Not);
      expect(expr.evaluate({foo: true})).to.be(false);
      expect(expr.evaluate({foo: false})).to.be(true);
      expect(expr.evaluate({foo: ''})).to.be(true);
      expect(expr.evaluate({foo: 'foo'})).to.be(false);
    });

    it('consumes whitespace as expected', function() {
      var expr = ol.expr.parse(' ! foo');
      expect(expr).to.be.a(ol.expr.Not);
      expect(expr.evaluate({foo: true})).to.be(false);
      expect(expr.evaluate({foo: false})).to.be(true);
    });

    it('parses not preceeding call expression', function() {
      var lib = {
        foo: function() {
          return true;
        }
      };
      var expr = ol.expr.parse('!foo()');
      expect(expr).to.be.a(ol.expr.Not);
      expect(expr.evaluate(null, lib)).to.be(false);
    });

    it('parses not in call argument', function() {
      var lib = {
        foo: function(arg) {
          return arg;
        }
      };
      var expr = ol.expr.parse('foo(!bar)');
      expect(expr).to.be.a(ol.expr.Call);
      expect(expr.evaluate({bar: true}, lib)).to.be(false);
      expect(expr.evaluate({bar: false}, lib)).to.be(true);
    });

  });

  describe('11.5 - multiplicitave operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.5

    it('parses * operator', function() {
      var expr = ol.expr.parse('foo*bar');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(200);
    });

    it('consumes whitespace as expected with *', function() {
      var expr = ol.expr.parse(' foo * bar ');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 15, bar: 2})).to.be(30);
    });

    it('parses / operator', function() {
      var expr = ol.expr.parse('foo/12');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 10})).to.be(10 / 12);
    });

    it('consumes whitespace as expected with /', function() {
      var expr = ol.expr.parse(' 4 / bar ');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({bar: 3})).to.be(4 / 3);
    });

    it('parses % operator', function() {
      var expr = ol.expr.parse('12%foo');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 10})).to.be(2);
    });

    it('consumes whitespace as expected with %', function() {
      var expr = ol.expr.parse(' 4 %bar ');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({bar: 3})).to.be(1);
    });

    it('parses * in call argument', function() {
      var lib = {
        foo: function(arg) {
          return arg;
        }
      };
      var expr = ol.expr.parse('foo(2 * bar)');
      expect(expr).to.be.a(ol.expr.Call);
      expect(expr.evaluate({bar: 3}, lib)).to.be(6);
      expect(expr.evaluate({bar: 4}, lib)).to.be(8);
    });

    it('evaluates left to right for equal precedence', function() {
      var expr = ol.expr.parse('2 / 4 * 20 % 15');
      expect(expr.evaluate()).to.be(10);
    });

    it('respects group precedence', function() {
      expect(ol.expr.parse('2 / 4 * (20 % 15)').evaluate()).to.be(2.5);
      expect(ol.expr.parse('2 / (4 * (20 % 15))').evaluate()).to.be(0.1);
      expect(ol.expr.parse('2 / ((4 * 20) % 15)').evaluate()).to.be(0.4);
      expect(ol.expr.parse('2 / (4 * 20) % 15').evaluate()).to.be(0.025);
      expect(ol.expr.parse('(2 / (4 * 20)) % 15').evaluate()).to.be(0.025);
      expect(ol.expr.parse('(2 / 4) * 20 % 15').evaluate()).to.be(10);
      expect(ol.expr.parse('((2 / 4) * 20) % 15').evaluate()).to.be(10);
    });

    it('parses * in left side of comparison expression', function() {
      var expr = ol.expr.parse('foo * 2 >bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 4, bar: 7})).to.be(true);
      expect(expr.evaluate({foo: 4, bar: 8})).to.be(false);
    });

    it('parses * in right side of comparison expression', function() {
      var expr = ol.expr.parse('foo > 2 * bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 4, bar: 1})).to.be(true);
      expect(expr.evaluate({foo: 4, bar: 2})).to.be(false);
    });

  });

  describe('11.6 - additive operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.6

    it('parses + operator', function() {
      var expr = ol.expr.parse('foo+bar');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(30);
    });

    it('consumes whitespace as expected with +', function() {
      var expr = ol.expr.parse(' foo +10 ');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 15})).to.be(25);
    });

    it('parses - operator', function() {
      var expr = ol.expr.parse('foo-bar');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(-10);
    });

    it('consumes whitespace as expected with -', function() {
      var expr = ol.expr.parse(' foo- 10 ');
      expect(expr).to.be.a(ol.expr.Math);
      expect(expr.evaluate({foo: 15})).to.be(5);
    });

    it('respects precedence', function() {
      expect(ol.expr.parse('2 + 4 * 20 - 15').evaluate()).to.be(67);
      expect(ol.expr.parse('(2 + 4) * 20 - 15').evaluate()).to.be(105);
      expect(ol.expr.parse('((2 + 4) * 20) - 15').evaluate()).to.be(105);
      expect(ol.expr.parse('(2 + (4 * 20)) - 15').evaluate()).to.be(67);
      expect(ol.expr.parse('2 + (4 * 20) - 15').evaluate()).to.be(67);
      expect(ol.expr.parse('2 + ((4 * 20) - 15)').evaluate()).to.be(67);
      expect(ol.expr.parse('2 + (4 * (20 - 15))').evaluate()).to.be(22);
      expect(ol.expr.parse('2 + 4 * (20 - 15)').evaluate()).to.be(22);
    });

    it('parses + in call argument', function() {
      var lib = {
        foo: function(arg) {
          return arg;
        }
      };
      var expr = ol.expr.parse('foo(2 + bar)');
      expect(expr).to.be.a(ol.expr.Call);
      expect(expr.evaluate({bar: 3}, lib)).to.be(5);
      expect(expr.evaluate({bar: 4}, lib)).to.be(6);
    });

    it('parses + in left side of comparison expression', function() {
      var expr = ol.expr.parse('foo+2>bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 4, bar: 5})).to.be(true);
      expect(expr.evaluate({foo: 4, bar: 6})).to.be(false);
    });

    it('parses + in right side of comparison expression', function() {
      var expr = ol.expr.parse('foo >2 +bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 4, bar: 1})).to.be(true);
      expect(expr.evaluate({foo: 4, bar: 2})).to.be(false);
    });

  });

  describe('11.7 - bitwise shift operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.7
    it('not supported');
  });

  describe('11.8 - relational operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.8

    it('parses < operator', function() {
      var expr = ol.expr.parse('foo<bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(true);
      expect(expr.evaluate({foo: 100, bar: 20})).to.be(false);
    });

    it('consumes whitespace as expected with <', function() {
      var expr = ol.expr.parse(' foo <10 ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 15})).to.be(false);
      expect(expr.evaluate({foo: 5})).to.be(true);
    });

    it('parses > operator', function() {
      var expr = ol.expr.parse('foo>bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(false);
      expect(expr.evaluate({foo: 100, bar: 20})).to.be(true);
    });

    it('consumes whitespace as expected with >', function() {
      var expr = ol.expr.parse(' foo> 10 ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 15})).to.be(true);
      expect(expr.evaluate({foo: 5})).to.be(false);
    });

    it('parses <= operator', function() {
      var expr = ol.expr.parse('foo<=bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(true);
      expect(expr.evaluate({foo: 100, bar: 20})).to.be(false);
      expect(expr.evaluate({foo: 20, bar: 20})).to.be(true);
    });

    it('consumes whitespace as expected with <=', function() {
      var expr = ol.expr.parse(' foo<= 10 ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 15})).to.be(false);
      expect(expr.evaluate({foo: 5})).to.be(true);
      expect(expr.evaluate({foo: 10})).to.be(true);
    });

    it('throws for invalid spacing with <=', function() {
      expect(function() {
        ol.expr.parse(' foo< = 10 ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('=');
        expect(token.index).to.be(6);
      });
    });

    it('parses >= operator', function() {
      var expr = ol.expr.parse('foo>=bar');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 10, bar: 20})).to.be(false);
      expect(expr.evaluate({foo: 100, bar: 20})).to.be(true);
      expect(expr.evaluate({foo: 20, bar: 20})).to.be(true);
    });

    it('consumes whitespace as expected with >=', function() {
      var expr = ol.expr.parse(' foo >=10 ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 15})).to.be(true);
      expect(expr.evaluate({foo: 5})).to.be(false);
      expect(expr.evaluate({foo: 10})).to.be(true);
    });

    it('throws for invalid spacing with >=', function() {
      expect(function() {
        ol.expr.parse(' 10 > =foo ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('=');
        expect(token.index).to.be(6);
      });
    });

  });

  describe('11.9 - equality operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.9

    it('parses == operator', function() {
      var expr = ol.expr.parse('foo==42');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(true);
      expect(expr.evaluate({foo: 41})).to.be(false);
      expect(expr.evaluate({foo: '42'})).to.be(true);
    });

    it('consumes whitespace as expected with ==', function() {
      var expr = ol.expr.parse(' 42 ==foo ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(true);
      expect(expr.evaluate({foo: 41})).to.be(false);
      expect(expr.evaluate({foo: '42'})).to.be(true);
    });

    it('throws for invalid spacing with ==', function() {
      expect(function() {
        ol.expr.parse(' 10 = =foo ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('=');
        expect(token.index).to.be(4);
      });
    });

    it('parses != operator', function() {
      var expr = ol.expr.parse('foo!=42');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(false);
      expect(expr.evaluate({foo: 41})).to.be(true);
      expect(expr.evaluate({foo: '42'})).to.be(false);
    });

    it('consumes whitespace as expected with !=', function() {
      var expr = ol.expr.parse(' 42 !=foo ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(false);
      expect(expr.evaluate({foo: 41})).to.be(true);
      expect(expr.evaluate({foo: '42'})).to.be(false);
    });

    it('throws for invalid spacing with !=', function() {
      expect(function() {
        ol.expr.parse(' 10! =foo ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('!');
        expect(token.index).to.be(3);
      });
    });

    it('parses === operator', function() {
      var expr = ol.expr.parse('42===foo');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(true);
      expect(expr.evaluate({foo: 41})).to.be(false);
      expect(expr.evaluate({foo: '42'})).to.be(false);
    });

    it('consumes whitespace as expected with ===', function() {
      var expr = ol.expr.parse(' foo ===42 ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(true);
      expect(expr.evaluate({foo: 41})).to.be(false);
      expect(expr.evaluate({foo: '42'})).to.be(false);
    });

    it('throws for invalid spacing with ===', function() {
      expect(function() {
        ol.expr.parse(' 10 = == foo ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('=');
        expect(token.index).to.be(4);
      });
    });

    it('parses !== operator', function() {
      var expr = ol.expr.parse('foo!==42');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(false);
      expect(expr.evaluate({foo: 41})).to.be(true);
      expect(expr.evaluate({foo: '42'})).to.be(true);
    });

    it('consumes whitespace as expected with !==', function() {
      var expr = ol.expr.parse(' 42 !== foo ');
      expect(expr).to.be.a(ol.expr.Comparison);
      expect(expr.evaluate({foo: 42})).to.be(false);
      expect(expr.evaluate({foo: 41})).to.be(true);
      expect(expr.evaluate({foo: '42'})).to.be(true);
    });

    it('throws for invalid spacing with !==', function() {
      expect(function() {
        ol.expr.parse(' 10 != = foo ');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('=');
        expect(token.index).to.be(7);
      });
    });
  });

  describe('11.10 - binary bitwise operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.10
    it('not supported');
  });

  describe('11.11 - binary logical operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.11

    it('parses && operator', function() {
      var expr = ol.expr.parse('foo&&bar');
      expect(expr).to.be.a(ol.expr.Logical);
      expect(expr.evaluate({foo: true, bar: true})).to.be(true);
      expect(expr.evaluate({foo: true, bar: false})).to.be(false);
      expect(expr.evaluate({foo: false, bar: true})).to.be(false);
      expect(expr.evaluate({foo: false, bar: false})).to.be(false);
    });

    it('consumes space as expected with &&', function() {
      var expr = ol.expr.parse(' foo && bar ');
      expect(expr).to.be.a(ol.expr.Logical);
      expect(expr.evaluate({foo: true, bar: true})).to.be(true);
      expect(expr.evaluate({foo: true, bar: false})).to.be(false);
      expect(expr.evaluate({foo: false, bar: true})).to.be(false);
      expect(expr.evaluate({foo: false, bar: false})).to.be(false);
    });

    it('throws for invalid spacing with &&', function() {
      expect(function() {
        ol.expr.parse('true & & false');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('&');
        expect(token.index).to.be(5);
      });
    });

    it('parses || operator', function() {
      var expr = ol.expr.parse('foo||bar');
      expect(expr).to.be.a(ol.expr.Logical);
      expect(expr.evaluate({foo: true, bar: true})).to.be(true);
      expect(expr.evaluate({foo: true, bar: false})).to.be(true);
      expect(expr.evaluate({foo: false, bar: true})).to.be(true);
      expect(expr.evaluate({foo: false, bar: false})).to.be(false);
    });

    it('consumes space as expected with ||', function() {
      var expr = ol.expr.parse(' foo || bar ');
      expect(expr).to.be.a(ol.expr.Logical);
      expect(expr.evaluate({foo: true, bar: true})).to.be(true);
      expect(expr.evaluate({foo: true, bar: false})).to.be(true);
      expect(expr.evaluate({foo: false, bar: true})).to.be(true);
      expect(expr.evaluate({foo: false, bar: false})).to.be(false);
    });

    it('throws for invalid spacing with ||', function() {
      expect(function() {
        ol.expr.parse('true | | false');
      }).throwException(function(err) {
        expect(err).to.be.an(ol.expr.UnexpectedToken);
        var token = err.token;
        expect(token.value).to.be('|');
        expect(token.index).to.be(5);
      });
    });

  });

  describe('11.12 - conditional operator', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.12
    it('not supported');
  });

  describe('11.13 - assignment operators', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.13
    it('not supported');
  });

  describe('11.14 - comma operator', function() {
    // http://www.ecma-international.org/ecma-262/5.1/#sec-11.14
    it('not supported');
  });

});

describe('ol.expr.lib', function() {

  var parse = ol.expr.parse;
  var evaluate = ol.expr.evaluateFeature;

  describe('concat()', function() {
    var feature = new ol.Feature({
      str: 'bar',
      num: 42,
      bool: false,
      nul: null
    });

    it('concatenates strings', function() {
      expect(evaluate(parse('concat(str, "after")'), feature))
          .to.be('barafter');
      expect(evaluate(parse('concat("before", str)'), feature))
          .to.be('beforebar');
      expect(evaluate(parse('concat("a", str, "b")'), feature))
          .to.be('abarb');
    });

    it('concatenates numbers as strings', function() {
      expect(evaluate(parse('concat(num, 0)'), feature))
          .to.be('420');
      expect(evaluate(parse('concat(0, num)'), feature))
          .to.be('042');
      expect(evaluate(parse('concat(42, 42)'), feature))
          .to.be('4242');
      expect(evaluate(parse('concat(str, num)'), feature))
          .to.be('bar42');
    });

    it('concatenates booleans as strings', function() {
      expect(evaluate(parse('concat(bool, "foo")'), feature))
          .to.be('falsefoo');
      expect(evaluate(parse('concat(true, str)'), feature))
          .to.be('truebar');
      expect(evaluate(parse('concat(true, false)'), feature))
          .to.be('truefalse');
    });

    it('concatenates nulls as strings', function() {
      expect(evaluate(parse('concat(nul, "foo")'), feature))
          .to.be('nullfoo');
      expect(evaluate(parse('concat(str, null)'), feature))
          .to.be('barnull');
    });

  });

  describe('extent()', function() {

    var nw = new ol.Feature({
      geom: new ol.geom.Polygon([[
        [-180, 90], [0, 90], [0, 0], [-180, 0], [-180, 90]
      ]])
    });

    var se = new ol.Feature({
      geom: new ol.geom.Polygon([[
        [180, -90], [0, -90], [0, 0], [180, 0], [180, -90]
      ]])
    });

    var north = parse('extent(-100, 100, 40, 60)');
    var south = parse('extent(-100, 100, -60, -40)');
    var east = parse('extent(80, 100, -50, 50)');
    var west = parse('extent(-100, -80, -50, 50)');

    it('evaluates to true for features within given extent', function() {

      expect(evaluate(north, nw)).to.be(true);
      expect(evaluate(south, nw)).to.be(false);
      expect(evaluate(east, nw)).to.be(false);
      expect(evaluate(west, nw)).to.be(true);

      expect(evaluate(north, se)).to.be(false);
      expect(evaluate(south, se)).to.be(true);
      expect(evaluate(east, se)).to.be(true);
      expect(evaluate(west, se)).to.be(false);

    });

  });

  describe('fid()', function() {

    var one = new ol.Feature();
    one.setFeatureId('one');

    var two = new ol.Feature();
    two.setFeatureId('two');

    var three = new ol.Feature();
    three.setFeatureId('three');

    var four = new ol.Feature();
    four.setFeatureId('four');

    var odd = parse('fid("one", "three")');
    var even = parse('fid("two", "four")');
    var first = parse('fid("one")');
    var last = parse('fid("four")');
    var none = parse('fid("foo")');

    it('evaluates to true if feature id matches', function() {
      expect(evaluate(odd, one)).to.be(true);
      expect(evaluate(odd, three)).to.be(true);
      expect(evaluate(even, two)).to.be(true);
      expect(evaluate(even, four)).to.be(true);
      expect(evaluate(first, one)).to.be(true);
      expect(evaluate(last, four)).to.be(true);
    });

    it('evaluates to false if feature id doesn\'t match', function() {
      expect(evaluate(odd, two)).to.be(false);
      expect(evaluate(odd, four)).to.be(false);
      expect(evaluate(even, one)).to.be(false);
      expect(evaluate(even, three)).to.be(false);
      expect(evaluate(first, two)).to.be(false);
      expect(evaluate(first, three)).to.be(false);
      expect(evaluate(first, four)).to.be(false);
      expect(evaluate(last, one)).to.be(false);
      expect(evaluate(last, two)).to.be(false);
      expect(evaluate(last, three)).to.be(false);
      expect(evaluate(none, one)).to.be(false);
      expect(evaluate(none, two)).to.be(false);
      expect(evaluate(none, three)).to.be(false);
      expect(evaluate(none, four)).to.be(false);
    });

  });

  describe('geometryType()', function() {

    var point = new ol.Feature({
      geom: new ol.geom.Point([0, 0])
    });

    var line = new ol.Feature({
      geom: new ol.geom.LineString([[180, -90], [-180, 90]])
    });

    var poly = new ol.Feature({
      geom: new ol.geom.Polygon([[
        [180, -90], [0, -90], [0, 0], [180, 0], [180, -90]
      ]])
    });

    var isPoint = parse('geometryType("point")');
    var isLine = parse('geometryType("linestring")');
    var isPoly = parse('geometryType("polygon")');
    var pointOrPoly = parse('geometryType("point") || geometryType("polygon")');

    it('distinguishes point features', function() {
      expect(evaluate(isPoint, point)).to.be(true);
      expect(evaluate(isPoint, line)).to.be(false);
      expect(evaluate(isPoint, poly)).to.be(false);
    });

    it('distinguishes line features', function() {
      expect(evaluate(isLine, point)).to.be(false);
      expect(evaluate(isLine, line)).to.be(true);
      expect(evaluate(isLine, poly)).to.be(false);
    });

    it('distinguishes polygon features', function() {
      expect(evaluate(isPoly, point)).to.be(false);
      expect(evaluate(isPoly, line)).to.be(false);
      expect(evaluate(isPoly, poly)).to.be(true);
    });

    it('can be composed in a logical expression', function() {
      expect(evaluate(pointOrPoly, point)).to.be(true);
      expect(evaluate(pointOrPoly, line)).to.be(false);
      expect(evaluate(pointOrPoly, poly)).to.be(true);
    });

  });

  describe('like()', function() {

    var one = new ol.Feature({foo: 'bar'});
    var two = new ol.Feature({foo: 'baz'});
    var three = new ol.Feature({foo: 'foo'});

    var like = parse('like(foo, "ba")');

    it('First and second feature match, third does not', function() {
      expect(evaluate(like, one), true);
      expect(evaluate(like, two), true);
      expect(evaluate(like, three), false);
    });

    var uclike = parse('like(foo, "BA")');
    it('Matchcase is true by default', function() {
      expect(evaluate(uclike, one), false);
      expect(evaluate(uclike, two), false);
      expect(evaluate(uclike, three), false);
    });

    var ilike = parse('like(foo, "BA", "*", ".", "!", false)');
    it('Using matchcase false, first two features match again', function() {
      expect(evaluate(ilike, one), true);
      expect(evaluate(ilike, two), true);
      expect(evaluate(uclike, three), false);
    });

  });

  describe('ieq()', function() {

    var one = new ol.Feature({foo: 'Bar'});
    var two = new ol.Feature({bar: 'Foo'});

    var ieq1 = parse('ieq(foo, "bar")');
    var ieq2 = parse('ieq("foo", bar)');

    it('case-insensitive equality for an attribute', function() {
      expect(evaluate(ieq1, one), true);
    });

    it('case-insensitive equality for an attribute as second argument',
        function() {
          expect(evaluate(ieq2, two), true);
        });

  });

  describe('ineq()', function() {

    var one = new ol.Feature({foo: 'Bar'});
    var two = new ol.Feature({bar: 'Foo'});

    var ieq1 = parse('ineq(foo, "bar")');
    var ieq2 = parse('ineq("foo", bar)');

    it('case-insensitive non-equality for an attribute', function() {
      expect(evaluate(ieq1, one), false);
    });

    it('case-insensitive non-equality for an attribute as second argument',
        function() {
          expect(evaluate(ieq2, two), false);
        });

  });

  describe('renderIntent()', function() {

    var feature = new ol.Feature();
    feature.renderIntent = 'foo';

    var isFoo = parse('renderIntent("foo")');
    var isBar = parse('renderIntent("bar")');

    it('True when renderIntent matches', function() {
      expect(evaluate(isFoo, feature), true);
    });

    it('False when renderIntent does not match', function() {
      expect(evaluate(isBar, feature), false);
    });

  });

});

describe('ol.expr.register()', function() {

  var spy;
  beforeEach(function() {
    spy = sinon.spy();
  });

  it('registers custom functions in ol.expr.lib', function() {
    ol.expr.register('someFunc', spy);
    expect(ol.expr.lib.someFunc).to.be(spy);
  });

  it('allows custom functions to be called', function() {
    ol.expr.register('myFunc', spy);
    var expr = ol.expr.parse('myFunc(42)');
    expr.evaluate(null, ol.expr.lib);
    expect(spy.calledOnce);
    expect(spy.calledWithExactly(42));
  });

  it('allows custom functions to be called with identifiers', function() {
    ol.expr.register('myFunc', spy);
    var expr = ol.expr.parse('myFunc(foo, 42)');
    expr.evaluate({foo: 'bar'}, ol.expr.lib);
    expect(spy.calledOnce).to.be(true);
    expect(spy.calledWithExactly('bar', 42)).to.be(true);
  });

  it('allows custom functions to be called with custom this obj', function() {
    ol.expr.register('myFunc', spy);
    var expr = ol.expr.parse('myFunc(foo, 42)');
    var that = {};
    expr.evaluate({foo: 'bar'}, ol.expr.lib, that);
    expect(spy.calledOnce).to.be(true);
    expect(spy.calledWithExactly('bar', 42)).to.be(true);
    expect(spy.calledOn(that)).to.be(true);
  });

  it('allows overriding existing ol.expr.lib functions', function() {
    var orig = ol.expr.lib.extent;
    expect(orig).not.to.be(spy);
    ol.expr.register('extent', spy);
    expect(ol.expr.lib.extent).to.be(spy);
    ol.expr.lib.extent = orig;
  });

});



goog.require('ol.Feature');
goog.require('ol.expr');
goog.require('ol.expr.Call');
goog.require('ol.expr.Comparison');
goog.require('ol.expr.Expression');
goog.require('ol.expr.Identifier');
goog.require('ol.expr.Literal');
goog.require('ol.expr.Logical');
goog.require('ol.expr.Math');
goog.require('ol.expr.Member');
goog.require('ol.expr.Not');
goog.require('ol.expr.TokenType');
goog.require('ol.expr.UnexpectedToken');
goog.require('ol.geom.LineString');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');