require 'test/unit' class TestAssignment < Test::Unit::TestCase def test_assign a=[]; a[0] ||= "bar"; assert_equal("bar", a[0]) h={}; h["foo"] ||= "bar"; assert_equal("bar", h["foo"]) aa = 5 aa ||= 25 assert_equal(5, aa) bb ||= 25 assert_equal(25, bb) cc &&=33 assert_nil(cc) cc = 5 cc &&=44 assert_equal(44, cc) a = nil; assert_nil(a) a = 1; assert_equal(1, a) a = []; assert_equal([], a) a = [1]; assert_equal([1], a) a = [nil]; assert_equal([nil], a) a = [[]]; assert_equal([[]], a) a = [1,2]; assert_equal([1,2], a) a = [*[]]; assert_equal([], a) a = [*[1]]; assert_equal([1], a) a = [*[1,2]]; assert_equal([1,2], a) a = *[]; assert_equal([], a) a = *[1]; assert_equal([1], a) a = *[nil]; assert_equal([nil], a) a = *[[]]; assert_equal([[]], a) a = *[1,2]; assert_equal([1,2], a) a = *[*[]]; assert_equal([], a) a = *[*[1]]; assert_equal([1], a) a = *[*[1,2]]; assert_equal([1,2], a) *a = nil; assert_equal([nil], a) *a = 1; assert_equal([1], a) *a = []; assert_equal([], a) *a = [1]; assert_equal([1], a) *a = [nil]; assert_equal([nil], a) *a = [[]]; assert_equal([[]], a) *a = [1,2]; assert_equal([1,2], a) *a = [*[]]; assert_equal([], a) *a = [*[1]]; assert_equal([1], a) *a = [*[1,2]]; assert_equal([1,2], a) *a = *[]; assert_equal([], a) *a = *[1]; assert_equal([1], a) *a = *[nil]; assert_equal([nil], a) *a = *[[]]; assert_equal([[]], a) *a = *[1,2]; assert_equal([1,2], a) *a = *[*[]]; assert_equal([], a) *a = *[*[1]]; assert_equal([1], a) *a = *[*[1,2]]; assert_equal([1,2], a) a,b,*c = nil; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = 1; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = []; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = [1]; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = [nil]; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = [[]]; assert_equal([[],nil,[]], [a,b,c]) a,b,*c = [1,2]; assert_equal([1,2,[]], [a,b,c]) a,b,*c = [*[]]; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = [*[1]]; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = [*[1,2]]; assert_equal([1,2,[]], [a,b,c]) a,b,*c = *[]; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = *[1]; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = *[nil]; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = *[[]]; assert_equal([[],nil,[]], [a,b,c]) a,b,*c = *[1,2]; assert_equal([1,2,[]], [a,b,c]) a,b,*c = *[*[]]; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = *[*[1]]; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = *[*[1,2]]; assert_equal([1,2,[]], [a,b,c]) end def test_yield def f; yield(nil); end; f {|a| assert_nil(a)}; undef f def f; yield(1); end; f {|a| assert_equal(1, a)}; undef f def f; yield([]); end; f {|a| assert_equal([], a)}; undef f def f; yield([1]); end; f {|a| assert_equal([1], a)}; undef f def f; yield([nil]); end; f {|a| assert_equal([nil], a)}; undef f def f; yield([[]]); end; f {|a| assert_equal([[]], a)}; undef f def f; yield([*[]]); end; f {|a| assert_equal([], a)}; undef f def f; yield([*[1]]); end; f {|a| assert_equal([1], a)}; undef f def f; yield([*[1,2]]); end; f {|a| assert_equal([1,2], a)}; undef f def f; yield(*[1]); end; f {|a| assert_equal(1, a)}; undef f def f; yield(*[nil]); end; f {|a| assert_equal(nil, a)}; undef f def f; yield(*[[]]); end; f {|a| assert_equal([], a)}; undef f def f; yield(*[*[1]]); end; f {|a| assert_equal(1, a)}; undef f def f; yield; end; f {|*a| assert_equal([], a)}; undef f def f; yield(nil); end; f {|*a| assert_equal([nil], a)}; undef f def f; yield(1); end; f {|*a| assert_equal([1], a)}; undef f def f; yield([]); end; f {|*a| assert_equal([[]], a)}; undef f def f; yield([1]); end; f {|*a| assert_equal([[1]], a)}; undef f def f; yield([nil]); end; f {|*a| assert_equal([[nil]], a)}; undef f def f; yield([[]]); end; f {|*a| assert_equal([[[]]], a)}; undef f def f; yield([1,2]); end; f {|*a| assert_equal([[1,2]], a)}; undef f def f; yield([*[]]); end; f {|*a| assert_equal([[]], a)}; undef f def f; yield([*[1]]); end; f {|*a| assert_equal([[1]], a)}; undef f def f; yield([*[1,2]]); end; f {|*a| assert_equal([[1,2]], a)}; undef f def f; yield(*[]); end; f {|*a| assert_equal([], a)}; undef f def f; yield(*[1]); end; f {|*a| assert_equal([1], a)}; undef f def f; yield(*[nil]); end; f {|*a| assert_equal([nil], a)}; undef f def f; yield(*[[]]); end; f {|*a| assert_equal([[]], a)}; undef f def f; yield(*[*[]]); end; f {|*a| assert_equal([], a)}; undef f def f; yield(*[*[1]]); end; f {|*a| assert_equal([1], a)}; undef f def f; yield(*[*[1,2]]); end; f {|*a| assert_equal([1,2], a)}; undef f def f; yield; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(nil); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(1); end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}; undef f def f; yield([]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield([1]); end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}; undef f def f; yield([nil]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield([[]]); end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}; undef f def f; yield([*[]]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield([*[1]]); end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}; undef f def f; yield([*[1,2]]); end; f {|a,b,*c| assert_equal([1,2,[]], [a,b,c])}; undef f def f; yield(*[]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(*[1]); end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}; undef f def f; yield(*[nil]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(*[[]]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(*[*[]]); end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}; undef f def f; yield(*[*[1]]); end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}; undef f def f; yield(*[*[1,2]]); end; f {|a,b,*c| assert_equal([1,2,[]], [a,b,c])}; undef f end def test_return def r; return; end; a = r(); assert_nil(a); undef r def r; return nil; end; a = r(); assert_nil(a); undef r def r; return 1; end; a = r(); assert_equal(1, a); undef r def r; return []; end; a = r(); assert_equal([], a); undef r def r; return [1]; end; a = r(); assert_equal([1], a); undef r def r; return [nil]; end; a = r(); assert_equal([nil], a); undef r def r; return [[]]; end; a = r(); assert_equal([[]], a); undef r def r; return [*[]]; end; a = r(); assert_equal([], a); undef r def r; return [*[1]]; end; a = r(); assert_equal([1], a); undef r def r; return [*[1,2]]; end; a = r(); assert_equal([1,2], a); undef r def r; return *[]; end; a = r(); assert_equal([], a); undef r def r; return *[1]; end; a = r(); assert_equal([1], a); undef r def r; return *[nil]; end; a = r(); assert_equal([nil], a); undef r def r; return *[[]]; end; a = r(); assert_equal([[]], a); undef r def r; return *[*[]]; end; a = r(); assert_equal([], a); undef r def r; return *[*[1]]; end; a = r(); assert_equal([1], a); undef r def r; return *[*[1,2]]; end; a = r(); assert_equal([1,2], a); undef r def r; return *[[]]; end; a = *r(); assert_equal([[]], a); undef r def r; return *[*[1,2]]; end; a = *r(); assert_equal([1,2], a); undef r def r; return; end; *a = r(); assert_equal([nil], a); undef r def r; return nil; end; *a = r(); assert_equal([nil], a); undef r def r; return 1; end; *a = r(); assert_equal([1], a); undef r def r; return []; end; *a = r(); assert_equal([], a); undef r def r; return [1]; end; *a = r(); assert_equal([1], a); undef r def r; return [nil]; end; *a = r(); assert_equal([nil], a); undef r def r; return [[]]; end; *a = r(); assert_equal([[]], a); undef r def r; return [1,2]; end; *a = r(); assert_equal([1,2], a); undef r def r; return [*[]]; end; *a = r(); assert_equal([], a); undef r def r; return [*[1]]; end; *a = r(); assert_equal([1], a); undef r def r; return [*[1,2]]; end; *a = r(); assert_equal([1,2], a); undef r def r; return *[]; end; *a = r(); assert_equal([], a); undef r def r; return *[1]; end; *a = r(); assert_equal([1], a); undef r def r; return *[nil]; end; *a = r(); assert_equal([nil], a); undef r def r; return *[[]]; end; *a = r(); assert_equal([[]], a); undef r def r; return *[1,2]; end; *a = r(); assert_equal([1,2], a); undef r def r; return *[*[]]; end; *a = r(); assert_equal([], a); undef r def r; return *[*[1]]; end; *a = r(); assert_equal([1], a); undef r def r; return *[*[1,2]]; end; *a = r(); assert_equal([1,2], a); undef r def r; return *[[]]; end; *a = *r(); assert_equal([[]], a); undef r def r; return *[1,2]; end; *a = *r(); assert_equal([1,2], a); undef r def r; return *[*[1,2]]; end; *a = *r(); assert_equal([1,2], a); undef r def r; return; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return nil; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return 1; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c]); undef r def r; return []; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return [1]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c]); undef r def r; return [nil]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return [[]]; end; a,b,*c = r(); assert_equal([[],nil,[]], [a,b,c]); undef r def r; return [1,2]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c]); undef r def r; return [*[]]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return [*[1]]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c]); undef r def r; return [*[1,2]]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c]); undef r def r; return *[]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return *[1]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c]); undef r def r; return *[nil]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return *[[]]; end; a,b,*c = r(); assert_equal([[],nil,[]], [a,b,c]); undef r def r; return *[1,2]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c]); undef r def r; return *[*[]]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c]); undef r def r; return *[*[1]]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c]); undef r def r; return *[*[1,2]]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c]); undef r def r; return 1, *[]; end; a,b = r(); assert_equal([1,nil], [a,b]); undef r def r; return 1,2,*[1]; end; a,b = r(); assert_equal([1,2], [a,b]); undef r def r; return 1,2,3,*[1,2]; end; a,b = r(); assert_equal([1,2], [a,b]); undef r end def test_lambda f = lambda {|r,| assert_equal([], r)} f.call([], *[]) f = lambda {|r,*l| assert_equal([], r); assert_equal([1], l)} f.call([], *[1]) f = lambda{|x| x} assert_equal(42, f.call(42)) assert_equal([42], f.call([42])) assert_equal([[42]], f.call([[42]])) assert_equal([42,55], f.call([42,55])) f = lambda{|x,| x} assert_equal(42, f.call(42)) assert_equal([42], f.call([42])) assert_equal([[42]], f.call([[42]])) assert_equal([42,55], f.call([42,55])) f = lambda{|*x| x} assert_equal([42], f.call(42)) assert_equal([[42]], f.call([42])) assert_equal([[[42]]], f.call([[42]])) assert_equal([[42,55]], f.call([42,55])) assert_equal([42,55], f.call(42,55)) end def test_multi a,=*[1] assert_equal(1, a) a,=*[[1]] assert_equal([1], a) a,=*[[[1]]] assert_equal([[1]], a) x, (y, z) = 1, 2, 3 assert_equal([1,2,nil], [x,y,z]) x, (y, z) = 1, [2,3] assert_equal([1,2,3], [x,y,z]) x, (y, z) = 1, [2] assert_equal([1,2,nil], [x,y,z]) end def test_break a = loop do break; end; assert_nil(a) a = loop do break nil; end; assert_nil(a) a = loop do break 1; end; assert_equal(1, a) a = loop do break []; end; assert_equal([], a) a = loop do break [1]; end; assert_equal([1], a) a = loop do break [nil]; end; assert_equal([nil], a) a = loop do break [[]]; end; assert_equal([[]], a) a = loop do break [*[]]; end; assert_equal([], a) a = loop do break [*[1]]; end; assert_equal([1], a) a = loop do break [*[1,2]]; end; assert_equal([1,2], a) a = loop do break *[]; end; assert_equal([], a) a = loop do break *[1]; end; assert_equal([1], a) a = loop do break *[nil]; end; assert_equal([nil], a) a = loop do break *[[]]; end; assert_equal([[]], a) a = loop do break *[*[]]; end; assert_equal([], a) a = loop do break *[*[1]]; end; assert_equal([1], a) a = loop do break *[*[1,2]]; end; assert_equal([1,2], a) *a = loop do break; end; assert_equal([nil], a) *a = loop do break nil; end; assert_equal([nil], a) *a = loop do break 1; end; assert_equal([1], a) *a = loop do break []; end; assert_equal([], a) *a = loop do break [1]; end; assert_equal([1], a) *a = loop do break [nil]; end; assert_equal([nil], a) *a = loop do break [[]]; end; assert_equal([[]], a) *a = loop do break [1,2]; end; assert_equal([1,2], a) *a = loop do break [*[]]; end; assert_equal([], a) *a = loop do break [*[1]]; end; assert_equal([1], a) *a = loop do break [*[1,2]]; end; assert_equal([1,2], a) *a = loop do break *[]; end; assert_equal([], a) *a = loop do break *[1]; end; assert_equal([1], a) *a = loop do break *[nil]; end; assert_equal([nil], a) *a = loop do break *[[]]; end; assert_equal([[]], a) *a = loop do break *[1,2]; end; assert_equal([1,2], a) *a = loop do break *[*[]]; end; assert_equal([], a) *a = loop do break *[*[1]]; end; assert_equal([1], a) *a = loop do break *[*[1,2]]; end; assert_equal([1,2], a) *a = *loop do break *[[]]; end; assert_equal([[]], a) *a = *loop do break *[1,2]; end; assert_equal([1,2], a) *a = *loop do break *[*[1,2]]; end; assert_equal([1,2], a) a,b,*c = loop do break; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break nil; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break 1; end; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = loop do break []; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break [1]; end; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = loop do break [nil]; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break [[]]; end; assert_equal([[],nil,[]], [a,b,c]) a,b,*c = loop do break [1,2]; end; assert_equal([1,2,[]], [a,b,c]) a,b,*c = loop do break [*[]]; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break [*[1]]; end; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = loop do break [*[1,2]]; end; assert_equal([1,2,[]], [a,b,c]) a,b,*c = loop do break *[]; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break *[1]; end; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = loop do break *[nil]; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break *[[]]; end; assert_equal([[],nil,[]], [a,b,c]) a,b,*c = loop do break *[1,2]; end; assert_equal([1,2,[]], [a,b,c]) a,b,*c = loop do break *[*[]]; end; assert_equal([nil,nil,[]], [a,b,c]) a,b,*c = loop do break *[*[1]]; end; assert_equal([1,nil,[]], [a,b,c]) a,b,*c = loop do break *[*[1,2]]; end; assert_equal([1,2,[]], [a,b,c]) end def test_next def r(val); a = yield(); assert_equal(val, a); end r(nil){next} r(nil){next nil} r(1){next 1} r([]){next []} r([1]){next [1]} r([nil]){next [nil]} r([[]]){next [[]]} r([]){next [*[]]} r([1]){next [*[1]]} r([1,2]){next [*[1,2]]} r([]){next *[]} r([1]){next *[1]} r([nil]){next *[nil]} r([[]]){next *[[]]} r([]){next *[*[]]} r([1]){next *[*[1]]} r([1,2]){next *[*[1,2]]} undef r def r(val); *a = yield(); assert_equal(val, a); end r([nil]){next} r([nil]){next nil} r([1]){next 1} r([]){next []} r([1]){next [1]} r([nil]){next [nil]} r([[]]){next [[]]} r([1,2]){next [1,2]} r([]){next [*[]]} r([1]){next [*[1]]} r([1,2]){next [*[1,2]]} undef r def r(val); *a = *yield(); assert_equal(val, a); end r([[]]){next *[[]]} r([1,2]){next *[1,2]} r([1,2]){next *[*[1,2]]} undef r def r(val); a,b,*c = yield(); assert_equal(val, [a,b,c]); end r([nil,nil,[]]){next} r([nil,nil,[]]){next nil} r([1,nil,[]]){next 1} r([nil,nil,[]]){next []} r([1,nil,[]]){next [1]} r([nil,nil,[]]){next [nil]} r([[],nil,[]]){next [[]]} r([1,2,[]]){next [1,2]} r([nil,nil,[]]){next [*[]]} r([1,nil,[]]){next [*[1]]} r([1,2,[]]){next [*[1,2]]} undef r def r(val); a,b,*c = *yield(); assert_equal(val, [a,b,c]); end r([[],nil,[]]){next *[[]]} r([1,2,[]]){next *[1,2]} r([1,2,[]]){next *[*[1,2]]} undef r end def test_massign a = nil assert(defined?(a)) assert_nil(a) # multiple asignment a, b = 1, 2 assert_equal 1, a assert_equal 2, b a, b, c = 1, 2, 3 assert_equal 1, a assert_equal 2, b assert_equal 3, c a = 1 b = 2 a, b = b, a assert_equal 2, a assert_equal 1, b a, = 1, 2 assert_equal 1, a a, = 1, 2, 3 assert_equal 1, a a, * = 1, 2, 3 assert_equal 1, a a, *b = 1, 2, 3 assert_equal 1, a assert_equal [2, 3], b # not supported yet #a, *b, c = 1, 2, 3, 4 #assert_equal 1, a #assert_equal [2,3], b #assert_equal 4, c a = 1, 2 assert_equal [1, 2], a a = [1, 2], [3, 4] assert_equal [[1,2], [3,4]], a a, (b, c), d = 1, [2, 3], 4 assert_equal 1, a assert_equal 2, b assert_equal 3, c assert_equal 4, d *a = 1, 2, 3 assert_equal([1, 2, 3], a) *a = 4 assert_equal([4], a) *a = nil assert_equal([nil], a) a, b = 1 assert_equal 1, a assert_nil b a, b = [1, 2] assert_equal 1, a assert_equal 2, b end def test_nested_massign (a, b), c = [[1, 2], 3]; assert_equal [1,2,3], [a,b,c] a, (b, c) = [[1, 2], 3]; assert_equal [[1,2], 3, nil], [a,b,c] a, (b, c) = [1, [2, 3]]; assert_equal [1,2,3], [a,b,c] (a, b), *c = [[1, 2], 3]; assert_equal [1,2,[3]], [a,b,c] (a,b),c,(d,e) = [[1,2],3,[4,5]]; assert_equal [1,2,3,4,5],[a,b,c,d,e] (a,*b),c,(d,e,*) = [[1,2],3,[4,5]]; assert_equal [1,[2],3,4,5],[a,b,c,d,e] (a,b),c,(d,*e) = [[1,2,3],4,[5,6,7,8]]; assert_equal [1,2,4,5,[6,7,8]],[a,b,c,d,e] (a,(b1,b2)),c,(d,e) = [[1,2],3,[4,5]]; assert_equal [1,2,nil,3,4,5],[a,b1,b2,c,d,e] (a,(b1,b2)),c,(d,e) = [[1,[21,22]],3,[4,5]]; assert_equal [1,21,22,3,4,5],[a,b1,b2,c,d,e] end class MyObj def to_ary [[1,2],[3,4]] end end def test_to_ary_splat a, b = MyObj.new assert_equal [[1,2],[3,4]], [a,b] end A = 1 B = 2 X, Y = A, B class Base A = 3 B = 4 end def test_const_massign assert_equal [1,2], [X,Y] a, b = Base::A, Base::B assert_equal [3,4], [a,b] end end require 'sentence' class TestAssignmentGen < Test::Unit::TestCase Syntax = { :exp => [["0"], ["nil"], ["false"], ["[]"], ["[",:exps,"]"]], :exps => [[:exp], [:exp,",",:exps]], :arg => [[:exp]], :mrhs => [[:args,",",:arg], [:args,",","*",:arg], ["*",:arg]], :args => [[:arg], ["*",:arg], [:args,",",:arg], [:args,",","*",:arg]], :mlhs => [[:mlhs_basic], ["(",:mlhs_inner,")"]], :mlhs_inner => [[:mlhs_basic], ["(",:mlhs_inner,")"]], :mlhs_basic => [[:mlhs_head], [:mlhs_head,:mlhs_item], [:mlhs_head,"*",:mlhs_node], [:mlhs_head,"*",:mlhs_node,",",:mlhs_post], [:mlhs_head,"*"], [:mlhs_head,"*",",", :mlhs_post], [ "*",:mlhs_node], [ "*",:mlhs_node,",",:mlhs_post], [ "*"], [ "*",",", :mlhs_post]], :mlhs_head => [[:mlhs_item,","], [:mlhs_head,:mlhs_item,","]], :mlhs_post => [[:mlhs_item], [:mlhs_post,",",:mlhs_item]], :mlhs_item => [[:mlhs_node], ["(",:mlhs_inner,")"]], :mlhs_node => [["var"]], :xassign => [["var"," = ",:exp], ["var"," = ",:mrhs], [:mlhs," = ",:exp], [:mlhs," = ",:mrhs]], } def rename_var(obj) vars = [] r = obj.subst('var') { var = "v#{vars.length}" vars << var var } return r, vars end def expand_except_paren(obj) return obj if obj.respond_to? :to_str obj.expand {|s| !(s[0] == '(' && s[-1] == ')') && !(s[0] == '[' && s[-1] == ']') } end def extract_single_element(ary) raise "not a single element array: #{ary.inspect}" if ary.length != 1 ary[0] end def emu_assign_ary(lhs, rv, h) rv = rv.respond_to?(:to_ary) ? rv : [rv] rv = rv.dup a = [[]] lhs.each {|e| if e == ',' a << [] else a.last << e end } a.pop if a.last == [] pre = [] star = post = nil a.each {|e| if post post << e elsif e[0] == '*' star = e post = [] else pre << e end } pre.map! {|e| extract_single_element(e) } if star if star == ['*'] star = nil else star = extract_single_element(star[1..-1]) end end post.map! {|e| extract_single_element(e) } if post until pre.empty? emu_assign_single(pre.shift, rv.shift, h) end if post if rv.length < post.length until post.empty? emu_assign_single(post.shift, rv.shift, h) end else until post.empty? emu_assign_single(post.pop, rv.pop, h) end end end if star emu_assign_single(star, rv, h) end end def emu_assign_single(lhs, rv, h={}) if lhs.respond_to? :to_str if /\A[a-z0-9]+\z/ =~ lhs h[lhs] = rv else raise "unexpected lhs string: #{lhs.inspect}" end elsif Sentence === lhs if lhs[0] == '(' && lhs[-1] == ')' emu_assign_ary(lhs[1...-1], rv, h) elsif lhs.length == 1 && String === lhs[0] && /\A[a-z0-9]+\z/ =~ lhs[0] h[lhs[0]] = rv else raise "unexpected lhs sentence: #{lhs.inspect}" end else raise "unexpected lhs: #{lhs.inspect}" end h end def emu_assign(assign) lhs = expand_except_paren(assign[0]) rhs = expand_except_paren(assign[2]) lopen = Sentence === lhs && lhs[-1] != ')' && lhs.any? {|e| e == '*' || e == ',' } ropen = Sentence === rhs && rhs[-1] != ']' && rhs.any? {|e| e == '*' || e == ',' } lhs = Sentence.new(['(']+lhs.to_a+[')']) if lopen begin rv = eval((ropen ? ["[",assign[2],"]"] : assign[2]).join('')) rescue Exception rv = $!.message end emu_assign_single(lhs, rv) end def do_assign(assign, vars) assign = assign.to_s code1 = "#{assign}; [#{vars.join(",")}]" assign.gsub!(/\bv\d+\b/, "o.a") code2 = "o=[];class << o; self end.send(:define_method,:a=){|v|self << v};#{assign};o" begin vals1 = eval(code1) rescue Exception return {:ex=>$!.message} end begin vals2 = eval(code2) rescue Exception return {:ex=>$!.message} end assert_equal(vals1, vals2, code1) vals = vals1 h = {} [vars, vals].transpose.each {|k,v| h[k] = v } h end def check(assign) assign, vars = rename_var(assign) sent = assign.to_s bruby = do_assign(assign, vars).to_a.sort bemu = emu_assign(assign).to_a.sort assert_equal(bemu, bruby, sent) end def test_assignment syntax = Sentence.expand_syntax(Syntax) Sentence.each(syntax, :xassign, 4) {|assign| check(assign) } end end