require File.join(File.dirname(__FILE__), 'spec_helper')

Regexp.send(:include, Sequel::SQL::StringMethods)
String.send(:include, Sequel::SQL::StringMethods)

context "Blockless Ruby Filters" do
  before do
    db = Sequel::Database.new
    db.quote_identifiers = false
    @d = db[:items]
    def @d.l(*args, &block)
      literal(filter_expr(*args, &block))
    end
    def @d.lit(*args)
      literal(*args)
    end
  end
  
  it "should support boolean columns directly" do
    @d.l(:x).should == 'x'
  end
  
  it "should support NOT via Symbol#~" do
    @d.l(~:x).should == 'NOT x'
  end
  
  it "should support qualified columns" do
    @d.l(:x__y).should == 'x.y'
    @d.l(~:x__y).should == 'NOT x.y'
  end

  it "should support NOT with SQL functions" do
    @d.l(~:is_blah.sql_function).should == 'NOT is_blah()'
    @d.l(~:is_blah.sql_function(:x)).should == 'NOT is_blah(x)'
    @d.l(~:is_blah.sql_function(:x__y)).should == 'NOT is_blah(x.y)'
    @d.l(~:is_blah.sql_function(:x, :x__y)).should == 'NOT is_blah(x, x.y)'
  end

  it "should handle multiple ~" do
    @d.l(~~:x).should == 'x'
    @d.l(~~~:x).should == 'NOT x'
    @d.l(~~(:x & :y)).should == '(x AND y)'
    @d.l(~~(:x | :y)).should == '(x OR y)'
  end

  it "should support = via Hash" do
    @d.l(:x => 100).should == '(x = 100)'
    @d.l(:x => 'a').should == '(x = \'a\')'
    @d.l(:x => true).should == '(x IS TRUE)'
    @d.l(:x => false).should == '(x IS FALSE)'
    @d.l(:x => nil).should == '(x IS NULL)'
    @d.l(:x => [1,2,3]).should == '(x IN (1, 2, 3))'
  end

  it "should use = 't' and != 't' OR IS NULL if IS TRUE is not supported" do
    @d.meta_def(:supports_is_true?){false}
    @d.l(:x => true).should == "(x = 't')"
    @d.l(~{:x => true}).should == "((x != 't') OR (x IS NULL))"
    @d.l(:x => false).should == "(x = 'f')"
    @d.l(~{:x => false}).should == "((x != 'f') OR (x IS NULL))"
  end
  
  it "should support != via Hash#~" do
    @d.l(~{:x => 100}).should == '(x != 100)'
    @d.l(~{:x => 'a'}).should == '(x != \'a\')'
    @d.l(~{:x => true}).should == '(x IS NOT TRUE)'
    @d.l(~{:x => false}).should == '(x IS NOT FALSE)'
    @d.l(~{:x => nil}).should == '(x IS NOT NULL)'
  end
  
  it "should support ~ via Hash and Regexp (if supported by database)" do
    @d.l(:x => /blah/).should == '(x ~ \'blah\')'
  end
  
  it "should support !~ via Hash#~ and Regexp" do
    @d.l(~{:x => /blah/}).should == '(x !~ \'blah\')'
  end
  
  it "should support LIKE via Symbol#like" do
    @d.l(:x.like('a')).should == '(x LIKE \'a\')'
    @d.l(:x.like(/a/)).should == '(x ~ \'a\')'
    @d.l(:x.like('a', 'b')).should == '((x LIKE \'a\') OR (x LIKE \'b\'))'
    @d.l(:x.like(/a/, /b/i)).should == '((x ~ \'a\') OR (x ~* \'b\'))'
    @d.l(:x.like('a', /b/)).should == '((x LIKE \'a\') OR (x ~ \'b\'))'

    @d.l('a'.like(:x)).should == "('a' LIKE x)"
    @d.l('a'.like(:x, 'b')).should == "(('a' LIKE x) OR ('a' LIKE 'b'))"
    @d.l('a'.like(:x, /b/)).should == "(('a' LIKE x) OR ('a' ~ 'b'))"
    @d.l('a'.like(:x, /b/i)).should == "(('a' LIKE x) OR ('a' ~* 'b'))"

    @d.l(/a/.like(:x)).should == "('a' ~ x)"
    @d.l(/a/.like(:x, 'b')).should == "(('a' ~ x) OR ('a' ~ 'b'))"
    @d.l(/a/.like(:x, /b/)).should == "(('a' ~ x) OR ('a' ~ 'b'))"
    @d.l(/a/.like(:x, /b/i)).should == "(('a' ~ x) OR ('a' ~* 'b'))"

    @d.l(/a/i.like(:x)).should == "('a' ~* x)"
    @d.l(/a/i.like(:x, 'b')).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/i.like(:x, /b/)).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/i.like(:x, /b/i)).should == "(('a' ~* x) OR ('a' ~* 'b'))"
  end

  it "should support NOT LIKE via Symbol#like and Symbol#~" do
    @d.l(~:x.like('a')).should == '(x NOT LIKE \'a\')'
    @d.l(~:x.like(/a/)).should == '(x !~ \'a\')'
    @d.l(~:x.like('a', 'b')).should == '((x NOT LIKE \'a\') AND (x NOT LIKE \'b\'))'
    @d.l(~:x.like(/a/, /b/i)).should == '((x !~ \'a\') AND (x !~* \'b\'))'
    @d.l(~:x.like('a', /b/)).should == '((x NOT LIKE \'a\') AND (x !~ \'b\'))'

    @d.l(~'a'.like(:x)).should == "('a' NOT LIKE x)"
    @d.l(~'a'.like(:x, 'b')).should == "(('a' NOT LIKE x) AND ('a' NOT LIKE 'b'))"
    @d.l(~'a'.like(:x, /b/)).should == "(('a' NOT LIKE x) AND ('a' !~ 'b'))"
    @d.l(~'a'.like(:x, /b/i)).should == "(('a' NOT LIKE x) AND ('a' !~* 'b'))"

    @d.l(~/a/.like(:x)).should == "('a' !~ x)"
    @d.l(~/a/.like(:x, 'b')).should == "(('a' !~ x) AND ('a' !~ 'b'))"
    @d.l(~/a/.like(:x, /b/)).should == "(('a' !~ x) AND ('a' !~ 'b'))"
    @d.l(~/a/.like(:x, /b/i)).should == "(('a' !~ x) AND ('a' !~* 'b'))"

    @d.l(~/a/i.like(:x)).should == "('a' !~* x)"
    @d.l(~/a/i.like(:x, 'b')).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/i.like(:x, /b/)).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/i.like(:x, /b/i)).should == "(('a' !~* x) AND ('a' !~* 'b'))"
  end

  it "should support ILIKE via Symbol#ilike" do
    @d.l(:x.ilike('a')).should == '(x ILIKE \'a\')'
    @d.l(:x.ilike(/a/)).should == '(x ~* \'a\')'
    @d.l(:x.ilike('a', 'b')).should == '((x ILIKE \'a\') OR (x ILIKE \'b\'))'
    @d.l(:x.ilike(/a/, /b/i)).should == '((x ~* \'a\') OR (x ~* \'b\'))'
    @d.l(:x.ilike('a', /b/)).should == '((x ILIKE \'a\') OR (x ~* \'b\'))'

    @d.l('a'.ilike(:x)).should == "('a' ILIKE x)"
    @d.l('a'.ilike(:x, 'b')).should == "(('a' ILIKE x) OR ('a' ILIKE 'b'))"
    @d.l('a'.ilike(:x, /b/)).should == "(('a' ILIKE x) OR ('a' ~* 'b'))"
    @d.l('a'.ilike(:x, /b/i)).should == "(('a' ILIKE x) OR ('a' ~* 'b'))"

    @d.l(/a/.ilike(:x)).should == "('a' ~* x)"
    @d.l(/a/.ilike(:x, 'b')).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/.ilike(:x, /b/)).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/.ilike(:x, /b/i)).should == "(('a' ~* x) OR ('a' ~* 'b'))"

    @d.l(/a/i.ilike(:x)).should == "('a' ~* x)"
    @d.l(/a/i.ilike(:x, 'b')).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/i.ilike(:x, /b/)).should == "(('a' ~* x) OR ('a' ~* 'b'))"
    @d.l(/a/i.ilike(:x, /b/i)).should == "(('a' ~* x) OR ('a' ~* 'b'))"
  end

  it "should support NOT ILIKE via Symbol#ilike and Symbol#~" do
    @d.l(~:x.ilike('a')).should == '(x NOT ILIKE \'a\')'
    @d.l(~:x.ilike(/a/)).should == '(x !~* \'a\')'
    @d.l(~:x.ilike('a', 'b')).should == '((x NOT ILIKE \'a\') AND (x NOT ILIKE \'b\'))'
    @d.l(~:x.ilike(/a/, /b/i)).should == '((x !~* \'a\') AND (x !~* \'b\'))'
    @d.l(~:x.ilike('a', /b/)).should == '((x NOT ILIKE \'a\') AND (x !~* \'b\'))'

    @d.l(~'a'.ilike(:x)).should == "('a' NOT ILIKE x)"
    @d.l(~'a'.ilike(:x, 'b')).should == "(('a' NOT ILIKE x) AND ('a' NOT ILIKE 'b'))"
    @d.l(~'a'.ilike(:x, /b/)).should == "(('a' NOT ILIKE x) AND ('a' !~* 'b'))"
    @d.l(~'a'.ilike(:x, /b/i)).should == "(('a' NOT ILIKE x) AND ('a' !~* 'b'))"

    @d.l(~/a/.ilike(:x)).should == "('a' !~* x)"
    @d.l(~/a/.ilike(:x, 'b')).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/.ilike(:x, /b/)).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/.ilike(:x, /b/i)).should == "(('a' !~* x) AND ('a' !~* 'b'))"

    @d.l(~/a/i.ilike(:x)).should == "('a' !~* x)"
    @d.l(~/a/i.ilike(:x, 'b')).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/i.ilike(:x, /b/)).should == "(('a' !~* x) AND ('a' !~* 'b'))"
    @d.l(~/a/i.ilike(:x, /b/i)).should == "(('a' !~* x) AND ('a' !~* 'b'))"
  end

  it "should support negating ranges via Hash#~ and Range" do
    @d.l(~{:x => 1..5}).should == '((x < 1) OR (x > 5))'
    @d.l(~{:x => 1...5}).should == '((x < 1) OR (x >= 5))'
  end
  
  it "should support negating NOT IN via Hash#~ and Dataset or Array" do
    @d.l(~{:x => @d.select(:i)}).should == '(x NOT IN (SELECT i FROM items))'
    @d.l(~{:x => [1,2,3]}).should == '(x NOT IN (1, 2, 3))'
  end

  it "should support + - * / via Symbol#+,-,*,/" do
    @d.l(:x + 1 > 100).should == '((x + 1) > 100)'
    @d.l((:x * :y) < 100.01).should == '((x * y) < 100.01)'
    @d.l((:x - :y/2) >= 100000000000000000000000000000000000).should == '((x - (y / 2)) >= 100000000000000000000000000000000000)'
    @d.l((((:x - :y)/(:x + :y))*:z) <= 100).should == '((((x - y) / (x + y)) * z) <= 100)'
    @d.l(~((((:x - :y)/(:x + :y))*:z) <= 100)).should == '((((x - y) / (x + y)) * z) > 100)'
  end
  
  it "should not allow negation of string expressions" do
    proc{~:x.sql_string}.should raise_error
    proc{~([:x, :y].sql_string_join)}.should raise_error
  end

  it "should not allow mathematical or string operations on true, false, or nil" do
    proc{:x + 1}.should_not raise_error
    proc{:x - true}.should raise_error(Sequel::Error)
    proc{:x / false}.should raise_error(Sequel::Error)
    proc{:x * nil}.should raise_error(Sequel::Error)
    proc{[:x, nil].sql_string_join}.should raise_error(Sequel::Error)
  end

  it "should not allow mathematical or string operations on boolean complex expressions" do
    proc{:x + (:y + 1)}.should_not raise_error
    proc{:x - (~:y)}.should raise_error(Sequel::Error)
    proc{:x / (:y & :z)}.should raise_error(Sequel::Error)
    proc{:x * (:y | :z)}.should raise_error(Sequel::Error)
    proc{:x + :y.like('a')}.should raise_error(Sequel::Error)
    proc{:x - :y.like(/a/)}.should raise_error(Sequel::Error)
    proc{:x * :y.like(/a/i)}.should raise_error(Sequel::Error)
    proc{:x + ~:y.like('a')}.should raise_error(Sequel::Error)
    proc{:x - ~:y.like(/a/)}.should raise_error(Sequel::Error)
    proc{:x * ~:y.like(/a/i)}.should raise_error(Sequel::Error)
    proc{[:x, ~:y.like(/a/i)].sql_string_join}.should raise_error(Sequel::Error)
  end

  it "should support AND conditions via &" do
    @d.l(:x & :y).should == '(x AND y)'
    @d.l(:x.sql_boolean & :y).should == '(x AND y)'
    @d.l(:x & :y & :z).should == '((x AND y) AND z)'
    @d.l(:x & {:y => :z}).should == '(x AND (y = z))'
    @d.l({:y => :z} & :x).should == '((y = z) AND x)'
    @d.l({:x => :a} & {:y => :z}).should == '((x = a) AND (y = z))'
    @d.l((:x + 200 < 0) & (:y - 200 < 0)).should == '(((x + 200) < 0) AND ((y - 200) < 0))'
    @d.l(:x & ~:y).should == '(x AND NOT y)'
    @d.l(~:x & :y).should == '(NOT x AND y)'
    @d.l(~:x & ~:y).should == '(NOT x AND NOT y)'
  end
  
  it "should support OR conditions via |" do
    @d.l(:x | :y).should == '(x OR y)'
    @d.l(:x.sql_boolean | :y).should == '(x OR y)'
    @d.l(:x | :y | :z).should == '((x OR y) OR z)'
    @d.l(:x | {:y => :z}).should == '(x OR (y = z))'
    @d.l({:y => :z} | :x).should == '((y = z) OR x)'
    @d.l({:x => :a} | {:y => :z}).should == '((x = a) OR (y = z))'
    @d.l((:x.sql_number > 200) | (:y.sql_number < 200)).should == '((x > 200) OR (y < 200))'
  end
  
  it "should support & | combinations" do
    @d.l((:x | :y) & :z).should == '((x OR y) AND z)'
    @d.l(:x | (:y & :z)).should == '(x OR (y AND z))'
    @d.l((:x & :w) | (:y & :z)).should == '((x AND w) OR (y AND z))'
  end
  
  it "should support & | with ~" do
    @d.l(~((:x | :y) & :z)).should == '((NOT x AND NOT y) OR NOT z)'
    @d.l(~(:x | (:y & :z))).should == '(NOT x AND (NOT y OR NOT z))'
    @d.l(~((:x & :w) | (:y & :z))).should == '((NOT x OR NOT w) AND (NOT y OR NOT z))'
    @d.l(~((:x.sql_number > 200) | (:y & :z))).should == '((x <= 200) AND (NOT y OR NOT z))'
  end
  
  it "should support LiteralString" do
    @d.l('x'.lit).should == '(x)'
    @d.l(~'x'.lit).should == 'NOT x'
    @d.l(~~'x'.lit).should == 'x'
    @d.l(~(('x'.lit | :y) & :z)).should == '((NOT x AND NOT y) OR NOT z)'
    @d.l(~(:x | 'y'.lit)).should == '(NOT x AND NOT y)'
    @d.l(~('x'.lit & 'y'.lit)).should == '(NOT x OR NOT y)'
    @d.l({'y'.lit => 'z'.lit} & 'x'.lit).should == '((y = z) AND x)'
    @d.l(('x'.lit > 200) & ('y'.lit < 200)).should == '((x > 200) AND (y < 200))'
    @d.l(~('x'.lit + 1 > 100)).should == '((x + 1) <= 100)'
    @d.l('x'.lit.like(/a/)).should == '(x ~ \'a\')'
    @d.l('x'.lit + 1 > 100).should == '((x + 1) > 100)'
    @d.l(('x'.lit * :y) < 100.01).should == '((x * y) < 100.01)'
    @d.l(('x'.lit - :y/2) >= 100000000000000000000000000000000000).should == '((x - (y / 2)) >= 100000000000000000000000000000000000)'
    @d.l(('z'.lit * (('x'.lit / :y)/(:x + :y))) <= 100).should == '((z * ((x / y) / (x + y))) <= 100)'
    @d.l(~(((('x'.lit - :y)/(:x + :y))*:z) <= 100)).should == '((((x - y) / (x + y)) * z) > 100)'
  end

  it "should support hashes by ANDing the conditions" do
    @d.l(:x => 100, :y => 'a')[1...-1].split(' AND ').sort.should == ['(x = 100)', '(y = \'a\')']
    @d.l(:x => true, :y => false)[1...-1].split(' AND ').sort.should == ['(x IS TRUE)', '(y IS FALSE)']
    @d.l(:x => nil, :y => [1,2,3])[1...-1].split(' AND ').sort.should == ['(x IS NULL)', '(y IN (1, 2, 3))']
  end
  
  it "should support sql_expr on hashes" do
    @d.l({:x => 100, :y => 'a'}.sql_expr)[1...-1].split(' AND ').sort.should == ['(x = 100)', '(y = \'a\')']
    @d.l({:x => true, :y => false}.sql_expr)[1...-1].split(' AND ').sort.should == ['(x IS TRUE)', '(y IS FALSE)']
    @d.l({:x => nil, :y => [1,2,3]}.sql_expr)[1...-1].split(' AND ').sort.should == ['(x IS NULL)', '(y IN (1, 2, 3))']
  end
  
  it "should support sql_negate on hashes" do
    @d.l({:x => 100, :y => 'a'}.sql_negate)[1...-1].split(' AND ').sort.should == ['(x != 100)', '(y != \'a\')']
    @d.l({:x => true, :y => false}.sql_negate)[1...-1].split(' AND ').sort.should == ['(x IS NOT TRUE)', '(y IS NOT FALSE)']
    @d.l({:x => nil, :y => [1,2,3]}.sql_negate)[1...-1].split(' AND ').sort.should == ['(x IS NOT NULL)', '(y NOT IN (1, 2, 3))']
  end
  
  it "should support ~ on hashes" do
    @d.l(~{:x => 100, :y => 'a'})[1...-1].split(' OR ').sort.should == ['(x != 100)', '(y != \'a\')']
    @d.l(~{:x => true, :y => false})[1...-1].split(' OR ').sort.should == ['(x IS NOT TRUE)', '(y IS NOT FALSE)']
    @d.l(~{:x => nil, :y => [1,2,3]})[1...-1].split(' OR ').sort.should == ['(x IS NOT NULL)', '(y NOT IN (1, 2, 3))']
  end
  
  it "should support sql_or on hashes" do
    @d.l({:x => 100, :y => 'a'}.sql_or)[1...-1].split(' OR ').sort.should == ['(x = 100)', '(y = \'a\')']
    @d.l({:x => true, :y => false}.sql_or)[1...-1].split(' OR ').sort.should == ['(x IS TRUE)', '(y IS FALSE)']
    @d.l({:x => nil, :y => [1,2,3]}.sql_or)[1...-1].split(' OR ').sort.should == ['(x IS NULL)', '(y IN (1, 2, 3))']
  end
  
  it "should support arrays with all two pairs the same as hashes" do
    @d.l([[:x, 100],[:y, 'a']]).should == '((x = 100) AND (y = \'a\'))'
    @d.l([[:x, true], [:y, false]]).should == '((x IS TRUE) AND (y IS FALSE))'
    @d.l([[:x, nil], [:y, [1,2,3]]]).should == '((x IS NULL) AND (y IN (1, 2, 3)))'
  end
  
  it "should support sql_expr on arrays with all two pairs" do
    @d.l([[:x, 100],[:y, 'a']].sql_expr).should == '((x = 100) AND (y = \'a\'))'
    @d.l([[:x, true], [:y, false]].sql_expr).should == '((x IS TRUE) AND (y IS FALSE))'
    @d.l([[:x, nil], [:y, [1,2,3]]].sql_expr).should == '((x IS NULL) AND (y IN (1, 2, 3)))'
  end
  
  it "should support sql_negate on arrays with all two pairs" do
    @d.l([[:x, 100],[:y, 'a']].sql_negate).should == '((x != 100) AND (y != \'a\'))'
    @d.l([[:x, true], [:y, false]].sql_negate).should == '((x IS NOT TRUE) AND (y IS NOT FALSE))'
    @d.l([[:x, nil], [:y, [1,2,3]]].sql_negate).should == '((x IS NOT NULL) AND (y NOT IN (1, 2, 3)))'
  end
  
  it "should support ~ on arrays with all two pairs" do
    @d.l(~[[:x, 100],[:y, 'a']]).should == '((x != 100) OR (y != \'a\'))'
    @d.l(~[[:x, true], [:y, false]]).should == '((x IS NOT TRUE) OR (y IS NOT FALSE))'
    @d.l(~[[:x, nil], [:y, [1,2,3]]]).should == '((x IS NOT NULL) OR (y NOT IN (1, 2, 3)))'
  end
  
  it "should support sql_or on arrays with all two pairs" do
    @d.l([[:x, 100],[:y, 'a']].sql_or).should == '((x = 100) OR (y = \'a\'))'
    @d.l([[:x, true], [:y, false]].sql_or).should == '((x IS TRUE) OR (y IS FALSE))'
    @d.l([[:x, nil], [:y, [1,2,3]]].sql_or).should == '((x IS NULL) OR (y IN (1, 2, 3)))'
  end
  
  it "should emulate columns for array values" do
    @d.l([:x, :y]=>[[1,2], [3,4]].sql_array).should == '((x, y) IN ((1, 2), (3, 4)))'
    @d.l([:x, :y, :z]=>[[1,2,5], [3,4,6]]).should == '((x, y, z) IN ((1, 2, 5), (3, 4, 6)))'
  end
  
  it "should emulate multiple column in if not supported" do
    @d.meta_def(:supports_multiple_column_in?){false}
    @d.l([:x, :y]=>[[1,2], [3,4]].sql_array).should == '(((x = 1) AND (y = 2)) OR ((x = 3) AND (y = 4)))'
    @d.l([:x, :y, :z]=>[[1,2,5], [3,4,6]]).should == '(((x = 1) AND (y = 2) AND (z = 5)) OR ((x = 3) AND (y = 4) AND (z = 6)))'
  end
  
  it "should support Array#sql_string_join for concatenation of SQL strings" do
    @d.lit([:x].sql_string_join).should == '(x)'
    @d.lit([:x].sql_string_join(', ')).should == '(x)'
    @d.lit([:x, :y].sql_string_join).should == '(x || y)'
    @d.lit([:x, :y].sql_string_join(', ')).should == "(x || ', ' || y)"
    @d.lit([:x.sql_function(1), :y.sql_subscript(1)].sql_string_join).should == '(x(1) || y[1])'
    @d.lit([:x.sql_function(1), 'y.z'.lit].sql_string_join(', ')).should == "(x(1) || ', ' || y.z)"
    @d.lit([:x, 1, :y].sql_string_join).should == "(x || '1' || y)"
    @d.lit([:x, 1, :y].sql_string_join(', ')).should == "(x || ', ' || '1' || ', ' || y)"
    @d.lit([:x, 1, :y].sql_string_join(:y__z)).should == "(x || y.z || '1' || y.z || y)"
    @d.lit([:x, 1, :y].sql_string_join(1)).should == "(x || '1' || '1' || '1' || y)"
    @d.lit([:x, :y].sql_string_join('y.x || x.y'.lit)).should == "(x || y.x || x.y || y)"
    @d.lit([[:x, :y].sql_string_join, [:a, :b].sql_string_join].sql_string_join).should == "((x || y) || (a || b))"
  end

  it "should support StringExpression#+ for concatenation of SQL strings" do
    @d.lit(:x.sql_string + :y).should == '(x || y)'
    @d.lit([:x].sql_string_join + :y).should == '((x) || y)'
    @d.lit([:x, :z].sql_string_join(' ') + :y).should == "((x || ' ' || z) || y)"
  end

  it "should be supported inside blocks" do
    @d.l{[[:x, nil], [:y, [1,2,3]]].sql_or}.should == '((x IS NULL) OR (y IN (1, 2, 3)))'
    @d.l{~[[:x, nil], [:y, [1,2,3]]]}.should == '((x IS NOT NULL) OR (y NOT IN (1, 2, 3)))'
    @d.l{~(((('x'.lit - :y)/(:x + :y))*:z) <= 100)}.should == '((((x - y) / (x + y)) * z) > 100)'
    @d.l{{:x => :a} & {:y => :z}}.should == '((x = a) AND (y = z))'
  end

  it "should support &, |, ^, ~, <<, and >> for NumericExpressions" do
    @d.l(:x.sql_number & 1 > 100).should == '((x & 1) > 100)'
    @d.l(:x.sql_number | 1 > 100).should == '((x | 1) > 100)'
    @d.l(:x.sql_number ^ 1 > 100).should == '((x ^ 1) > 100)'
    @d.l(~:x.sql_number > 100).should == '(~x > 100)'
    @d.l(:x.sql_number << 1 > 100).should == '((x << 1) > 100)'
    @d.l(:x.sql_number >> 1 > 100).should == '((x >> 1) > 100)'
    @d.l((:x + 1) & 1 > 100).should == '(((x + 1) & 1) > 100)'
    @d.l((:x + 1) | 1 > 100).should == '(((x + 1) | 1) > 100)'
    @d.l((:x + 1) ^ 1 > 100).should == '(((x + 1) ^ 1) > 100)'
    @d.l(~(:x + 1) > 100).should == '(~(x + 1) > 100)'
    @d.l((:x + 1) << 1 > 100).should == '(((x + 1) << 1) > 100)'
    @d.l((:x + 1) >> 1 > 100).should == '(((x + 1) >> 1) > 100)'
    @d.l((:x + 1) & (:x + 2) > 100).should == '(((x + 1) & (x + 2)) > 100)'
  end

  it "should raise an error if use a Bitwise method on a ComplexExpression that isn't a NumericExpression" do
    proc{(:x + 1) & (:x & 2)}.should raise_error(Sequel::Error)
  end

  it "should raise an error if use a Boolean method on a ComplexExpression that isn't a BooleanExpression" do
    proc{:x & (:x + 2)}.should raise_error(Sequel::Error)
  end

  it "should raise an error if attempting to invert a ComplexExpression that isn't a BooleanExpression" do
    proc{Sequel::SQL::BooleanExpression.invert(:x + 2)}.should raise_error(Sequel::Error)
  end

  it "should return self on .lit" do
    y = :x + 1
    y.lit.should == y
  end

  it "should raise an error if trying to create an invalid complex expression" do
    proc{Sequel::SQL::ComplexExpression.new(:BANG, 1, 2)}.should raise_error(Sequel::Error)
  end

  it "should raise an error if trying to literalize an invalid complex expression" do
    ce = :x + 1
    ce.instance_variable_set(:@op, :BANG)
    proc{@d.lit(ce)}.should raise_error(Sequel::Error)
  end

  it "should support equality comparison of two expressions" do
    e1 = ~:comment.like('%:hidden:%')
    e2 = ~:comment.like('%:hidden:%')
    e1.should == e2
  end
  
  if RUBY_VERSION < '1.9.0'
    it "should not allow inequality operations on true, false, or nil" do
      proc{:x > 1}.should_not raise_error
      proc{:x < true}.should raise_error(Sequel::Error)
      proc{:x >= false}.should raise_error(Sequel::Error)
      proc{:x <= nil}.should raise_error(Sequel::Error)
    end

    it "should not allow inequality operations on boolean complex expressions" do
      proc{:x > (:y > 5)}.should raise_error(Sequel::Error)
      proc{:x < (:y < 5)}.should raise_error(Sequel::Error)
      proc{:x >= (:y >= 5)}.should raise_error(Sequel::Error)
      proc{:x <= (:y <= 5)}.should raise_error(Sequel::Error)
      proc{:x > {:y => nil}}.should raise_error(Sequel::Error)
      proc{:x < ~{:y => nil}}.should raise_error(Sequel::Error)
      proc{:x >= {:y => 5}}.should raise_error(Sequel::Error)
      proc{:x <= ~{:y => 5}}.should raise_error(Sequel::Error)
      proc{:x >= {:y => [1,2,3]}}.should raise_error(Sequel::Error)
      proc{:x <= ~{:y => [1,2,3]}}.should raise_error(Sequel::Error)
    end
    
    it "should support >, <, >=, and <= via Symbol#>,<,>=,<=" do
      @d.l(:x > 100).should == '(x > 100)'
      @d.l(:x < 100.01).should == '(x < 100.01)'
      @d.l(:x >= 100000000000000000000000000000000000).should == '(x >= 100000000000000000000000000000000000)'
      @d.l(:x <= 100).should == '(x <= 100)'
    end
    
    it "should support negation of >, <, >=, and <= via Symbol#~" do
      @d.l(~(:x > 100)).should == '(x <= 100)'
      @d.l(~(:x < 100.01)).should == '(x >= 100.01)'
      @d.l(~(:x >= 100000000000000000000000000000000000)).should == '(x < 100000000000000000000000000000000000)'
      @d.l(~(:x <= 100)).should == '(x > 100)'
    end
    
    it "should support double negation via ~" do
      @d.l(~~(:x > 100)).should == '(x > 100)'
    end
  end
end

context Sequel::SQL::VirtualRow do
  before do
    db = Sequel::Database.new
    db.quote_identifiers = true
    @d = db[:items]
    @d.meta_def(:supports_window_functions?){true}
    def @d.l(*args, &block)
      literal(filter_expr(*args, &block))
    end
  end

  it "should treat methods without arguments as identifiers" do
    @d.l{column}.should == '"column"'
  end

  it "should treat methods without arguments that have embedded double underscores as qualified identifiers" do
    @d.l{table__column}.should == '"table"."column"'
  end

  it "should treat methods with arguments as functions with the arguments" do
    @d.l{function(arg1, 10, 'arg3')}.should == 'function("arg1", 10, \'arg3\')'
  end

  it "should treat methods with a block and no arguments as a function call with no arguments" do
    @d.l{version{}}.should == 'version()'
  end

  it "should treat methods with a block and a leading argument :* as a function call with the SQL wildcard" do
    @d.l{count(:*){}}.should == 'count(*)'
  end

  it "should treat methods with a block and a leading argument :distinct as a function call with DISTINCT and the additional method arguments" do
    @d.l{count(:distinct, column1){}}.should == 'count(DISTINCT "column1")'
    @d.l{count(:distinct, column1, column2){}}.should == 'count(DISTINCT "column1", "column2")'
  end

  it "should raise an error if an unsupported argument is used with a block" do
    proc{@d.l{count(:blah){}}}.should raise_error(Sequel::Error)
  end

  it "should treat methods with a block and a leading argument :over as a window function call" do
    @d.l{rank(:over){}}.should == 'rank() OVER ()'
  end

  it "should support :partition options for window function calls" do
    @d.l{rank(:over, :partition=>column1){}}.should == 'rank() OVER (PARTITION BY "column1")'
    @d.l{rank(:over, :partition=>[column1, column2]){}}.should == 'rank() OVER (PARTITION BY "column1", "column2")'
  end

  it "should support :args options for window function calls" do
    @d.l{avg(:over, :args=>column1){}}.should == 'avg("column1") OVER ()'
    @d.l{avg(:over, :args=>[column1, column2]){}}.should == 'avg("column1", "column2") OVER ()'
  end

  it "should support :order option for window function calls" do
    @d.l{rank(:over, :order=>column1){}}.should == 'rank() OVER (ORDER BY "column1")'
    @d.l{rank(:over, :order=>[column1, column2]){}}.should == 'rank() OVER (ORDER BY "column1", "column2")'
  end

  it "should support :window option for window function calls" do
    @d.l{rank(:over, :window=>:win){}}.should == 'rank() OVER ("win")'
  end

  it "should support :*=>true option for window function calls" do
    @d.l{count(:over, :* =>true){}}.should == 'count(*) OVER ()'
  end

  it "should support :frame=>:all option for window function calls" do
    @d.l{rank(:over, :frame=>:all){}}.should == 'rank() OVER (ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)'
  end

  it "should support :frame=>:rows option for window function calls" do
    @d.l{rank(:over, :frame=>:rows){}}.should == 'rank() OVER (ROWS UNBOUNDED PRECEDING)'
  end

  it "should raise an error if an invalid :frame option is used" do
    proc{@d.l{rank(:over, :frame=>:blah){}}}.should raise_error(Sequel::Error)
  end

  it "should support all these options together" do
    @d.l{count(:over, :* =>true, :partition=>a, :order=>b, :window=>:win, :frame=>:rows){}}.should == 'count(*) OVER ("win" PARTITION BY "a" ORDER BY "b" ROWS UNBOUNDED PRECEDING)'
  end

  it "should raise an error if window functions are not supported" do
    @d.meta_def(:supports_window_functions?){false}
    proc{@d.l{count(:over, :* =>true, :partition=>a, :order=>b, :window=>:win, :frame=>:rows){}}}.should raise_error(Sequel::Error)
    proc{Sequel::Dataset.new(nil).filter{count(:over, :* =>true, :partition=>a, :order=>b, :window=>:win, :frame=>:rows){}}.sql}.should raise_error(Sequel::Error)
  end
  
  it "should deal with classes without requiring :: prefix" do
    @d.l{date < Date.today}.should == "(\"date\" < '#{Date.today}')"
    @d.l{date < Sequel::CURRENT_DATE}.should == "(\"date\" < CURRENT_DATE)"
    @d.l{num < Math::PI.to_i}.should == "(\"num\" < 3)"
  end
end