|
| 1 | +from test.test_support import verify, TestFailed |
| 2 | + |
| 3 | +print "1. simple nesting" |
| 4 | + |
| 5 | +def make_adder(x): |
| 6 | + def adder(y): |
| 7 | + return x + y |
| 8 | + return adder |
| 9 | + |
| 10 | +inc = make_adder(1) |
| 11 | +plus10 = make_adder(10) |
| 12 | + |
| 13 | +verify(inc(1) == 2) |
| 14 | +verify(plus10(-2) == 8) |
| 15 | + |
| 16 | +print "2. extra nesting" |
| 17 | + |
| 18 | +def make_adder2(x): |
| 19 | + def extra(): # check freevars passing through non-use scopes |
| 20 | + def adder(y): |
| 21 | + return x + y |
| 22 | + return adder |
| 23 | + return extra() |
| 24 | + |
| 25 | +inc = make_adder2(1) |
| 26 | +plus10 = make_adder2(10) |
| 27 | + |
| 28 | +verify(inc(1) == 2) |
| 29 | +verify(plus10(-2) == 8) |
| 30 | + |
| 31 | +print "3. simple nesting + rebinding" |
| 32 | + |
| 33 | +def make_adder3(x): |
| 34 | + def adder(y): |
| 35 | + return x + y |
| 36 | + x = x + 1 # check tracking of assignment to x in defining scope |
| 37 | + return adder |
| 38 | + |
| 39 | +inc = make_adder3(0) |
| 40 | +plus10 = make_adder3(9) |
| 41 | + |
| 42 | +verify(inc(1) == 2) |
| 43 | +verify(plus10(-2) == 8) |
| 44 | + |
| 45 | +print "4. nesting with global but no free" |
| 46 | + |
| 47 | +def make_adder4(): # XXX add exta level of indirection |
| 48 | + def nest(): |
| 49 | + def nest(): |
| 50 | + def adder(y): |
| 51 | + return global_x + y # check that plain old globals work |
| 52 | + return adder |
| 53 | + return nest() |
| 54 | + return nest() |
| 55 | + |
| 56 | +global_x = 1 |
| 57 | +adder = make_adder4() |
| 58 | +verify(adder(1) == 2) |
| 59 | + |
| 60 | +global_x = 10 |
| 61 | +verify(adder(-2) == 8) |
| 62 | + |
| 63 | +print "5. nesting through class" |
| 64 | + |
| 65 | +def make_adder5(x): |
| 66 | + class Adder: |
| 67 | + def __call__(self, y): |
| 68 | + return x + y |
| 69 | + return Adder() |
| 70 | + |
| 71 | +inc = make_adder5(1) |
| 72 | +plus10 = make_adder5(10) |
| 73 | + |
| 74 | +verify(inc(1) == 2) |
| 75 | +verify(plus10(-2) == 8) |
| 76 | + |
| 77 | +print "6. nesting plus free ref to global" |
| 78 | + |
| 79 | +def make_adder6(x): |
| 80 | + global global_nest_x |
| 81 | + def adder(y): |
| 82 | + return global_nest_x + y |
| 83 | + global_nest_x = x |
| 84 | + return adder |
| 85 | + |
| 86 | +inc = make_adder6(1) |
| 87 | +plus10 = make_adder6(10) |
| 88 | + |
| 89 | +verify(inc(1) == 2) |
| 90 | +verify(plus10(-2) == 8) |
| 91 | + |
| 92 | +print "7. nearest enclosing scope" |
| 93 | + |
| 94 | +def f(x): |
| 95 | + def g(y): |
| 96 | + x = 42 # check that this masks binding in f() |
| 97 | + def h(z): |
| 98 | + return x + z |
| 99 | + return h |
| 100 | + return g(2) |
| 101 | + |
| 102 | +test_func = f(10) |
| 103 | +verify(test_func(5) == 47) |
| 104 | + |
| 105 | +print "8. mixed freevars and cellvars" |
| 106 | + |
| 107 | +def identity(x): |
| 108 | + return x |
| 109 | + |
| 110 | +def f(x, y, z): |
| 111 | + def g(a, b, c): |
| 112 | + a = a + x # 3 |
| 113 | + def h(): |
| 114 | + # z * (4 + 9) |
| 115 | + # 3 * 13 |
| 116 | + return identity(z * (b + y)) |
| 117 | + y = c + z # 9 |
| 118 | + return h |
| 119 | + return g |
| 120 | + |
| 121 | +g = f(1, 2, 3) |
| 122 | +h = g(2, 4, 6) |
| 123 | +verify(h() == 39) |
| 124 | + |
| 125 | +print "9. free variable in method" |
| 126 | + |
| 127 | +def test(): |
| 128 | + method_and_var = "var" |
| 129 | + class Test: |
| 130 | + def method_and_var(self): |
| 131 | + return "method" |
| 132 | + def test(self): |
| 133 | + return method_and_var |
| 134 | + def actual_global(self): |
| 135 | + return str("global") |
| 136 | + def str(self): |
| 137 | + return str(self) |
| 138 | + return Test() |
| 139 | + |
| 140 | +t = test() |
| 141 | +verify(t.test() == "var") |
| 142 | +verify(t.method_and_var() == "method") |
| 143 | +verify(t.actual_global() == "global") |
| 144 | + |
| 145 | +method_and_var = "var" |
| 146 | +class Test: |
| 147 | + # this class is not nested, so the rules are different |
| 148 | + def method_and_var(self): |
| 149 | + return "method" |
| 150 | + def test(self): |
| 151 | + return method_and_var |
| 152 | + def actual_global(self): |
| 153 | + return str("global") |
| 154 | + def str(self): |
| 155 | + return str(self) |
| 156 | + |
| 157 | +t = test() |
| 158 | +verify(t.test() == "var") |
| 159 | +verify(t.method_and_var() == "method") |
| 160 | +verify(t.actual_global() == "global") |
| 161 | + |
| 162 | +print "10. recursion" |
| 163 | + |
| 164 | +def f(x): |
| 165 | + def fact(n): |
| 166 | + if n == 0: |
| 167 | + return 1 |
| 168 | + else: |
| 169 | + return n * fact(n - 1) |
| 170 | + if x >= 0: |
| 171 | + return fact(x) |
| 172 | + else: |
| 173 | + raise ValueError, "x must be >= 0" |
| 174 | + |
| 175 | +verify(f(6) == 720) |
| 176 | + |
| 177 | + |
| 178 | +print "11. unoptimized namespaces" |
| 179 | + |
| 180 | +def check_syntax(s): |
| 181 | + try: |
| 182 | + compile(s, '?', 'exec') |
| 183 | + except SyntaxError: |
| 184 | + pass |
| 185 | + else: |
| 186 | + raise TestFailed |
| 187 | + |
| 188 | +# XXX for now, it is easiest to call this a syntax error: |
| 189 | +# explicit is better than implicit... |
| 190 | +test1 = \ |
| 191 | +"""def unoptimized_clash1(strip): |
| 192 | + def f(s): |
| 193 | + from string import * |
| 194 | + return strip(s) # ambiguity: free or local |
| 195 | + return f |
| 196 | +""" |
| 197 | +check_syntax(test1) |
| 198 | + |
| 199 | +# a little harder to reject this one, but possible... |
| 200 | +test2 = \ |
| 201 | +"""def unoptimized_clash2(): |
| 202 | + from string import * |
| 203 | + def f(s): |
| 204 | + return strip(s) # ambiguity: global or local |
| 205 | + return f |
| 206 | +""" |
| 207 | +# check_syntax(test2) |
| 208 | + |
| 209 | +# XXX could allow this for exec with const argument, but what's the point |
| 210 | +test3 = \ |
| 211 | +"""def error(y): |
| 212 | + exec "a = 1" |
| 213 | + def f(x): |
| 214 | + return x + y |
| 215 | + return f |
| 216 | +""" |
| 217 | +check_syntax(test3) |
| 218 | + |
| 219 | +test4 = \ |
| 220 | +"""def f(x): |
| 221 | + def g(): |
| 222 | + return x |
| 223 | + del x |
| 224 | +""" |
| 225 | +check_syntax(test4) |
| 226 | + |
| 227 | +print "12. lambdas" |
| 228 | + |
| 229 | +f1 = lambda x: lambda y: x + y |
| 230 | +inc = f1(1) |
| 231 | +plus10 = f1(10) |
| 232 | +verify(inc(1) == 2) |
| 233 | +verify(plus10(5) == 15) |
| 234 | + |
| 235 | +f2 = lambda x: (lambda : lambda y: x + y)() |
| 236 | +inc = f2(1) |
| 237 | +plus10 = f2(10) |
| 238 | +verify(inc(1) == 2) |
| 239 | +verify(plus10(5) == 15) |
| 240 | + |
| 241 | +f3 = lambda x: lambda y: global_x + y |
| 242 | +global_x = 1 |
| 243 | +inc = f3(None) |
| 244 | +verify(inc(2) == 3) |
| 245 | + |
| 246 | +f8 = lambda x, y, z: lambda a, b, c: lambda : z * (b + y) |
| 247 | +g = f8(1, 2, 3) |
| 248 | +h = g(2, 4, 6) |
| 249 | +verify(h() == 18) |
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