test/test_jsinterp.py

   1 #!/usr/bin/env python3
   2
   3 # Allow direct execution
   4 import os
   5 import sys
   6 import unittest
   7
   8 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
   9
  10 import math
  11 import re
  12
  13 from yt_dlp.jsinterp import JS_Undefined, JSInterpreter
  14
  15
  16 class TestJSInterpreter(unittest.TestCase):
  17     def _test(self, code, ret, func='f', args=()):
  18         self.assertEqual(JSInterpreter(code).call_function(func, *args), ret)
  19
  20     def test_basic(self):
  21         jsi = JSInterpreter('function f(){;}')
  22         self.assertEqual(repr(jsi.extract_function('f')), 'F<f>')
  23         self.assertEqual(jsi.call_function('f'), None)
  24
  25         self._test('function f(){return 42;}', 42)
  26         self._test('function f(){42}', None)
  27         self._test('var f = function(){return 42;}', 42)
  28
  29     def test_calc(self):
  30         self._test('function f(a){return 2*a+1;}', 7, args=[3])
  31
  32     def test_empty_return(self):
  33         self._test('function f(){return; y()}', None)
  34
  35     def test_morespace(self):
  36         self._test('function f (a) { return 2 * a + 1 ; }', 7, args=[3])
  37         self._test('function f () { x =  2  ; return x; }', 2)
  38
  39     def test_strange_chars(self):
  40         self._test('function $_xY1 ($_axY1) { var $_axY2 = $_axY1 + 1; return $_axY2; }',
  41                    21, args=[20], func='$_xY1')
  42
  43     def test_operators(self):
  44         self._test('function f(){return 1 << 5;}', 32)
  45         self._test('function f(){return 2 ** 5}', 32)
  46         self._test('function f(){return 19 & 21;}', 17)
  47         self._test('function f(){return 11 >> 2;}', 2)
  48         self._test('function f(){return []? 2+3: 4;}', 5)
  49         self._test('function f(){return 1 == 2}', False)
  50         self._test('function f(){return 0 && 1 || 2;}', 2)
  51         self._test('function f(){return 0 ?? 42;}', 0)
  52         self._test('function f(){return "life, the universe and everything" < 42;}', False)
  53
  54     def test_array_access(self):
  55         self._test('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}', [5, 2, 7])
  56
  57     def test_parens(self):
  58         self._test('function f(){return (1) + (2) * ((( (( (((((3)))))) )) ));}', 7)
  59         self._test('function f(){return (1 + 2) * 3;}', 9)
  60
  61     def test_quotes(self):
  62         self._test(R'function f(){return "a\"\\("}', R'a"\(')
  63
  64     def test_assignments(self):
  65         self._test('function f(){var x = 20; x = 30 + 1; return x;}', 31)
  66         self._test('function f(){var x = 20; x += 30 + 1; return x;}', 51)
  67         self._test('function f(){var x = 20; x -= 30 + 1; return x;}', -11)
  68
  69     def test_comments(self):
  70         'Skipping: Not yet fully implemented'
  71         return
  72         self._test('''
  73             function f() {
  74                 var x = /* 1 + */ 2;
  75                 var y = /* 30
  76                 * 40 */ 50;
  77                 return x + y;
  78             }
  79         ''', 52)
  80
  81         self._test('''
  82             function f() {
  83                 var x = "/*";
  84                 var y = 1 /* comment */ + 2;
  85                 return y;
  86             }
  87         ''', 3)
  88
  89     def test_precedence(self):
  90         self._test('''
  91             function f() {
  92                 var a = [10, 20, 30, 40, 50];
  93                 var b = 6;
  94                 a[0]=a[b%a.length];
  95                 return a;
  96             }
  97         ''', [20, 20, 30, 40, 50])
  98
  99     def test_builtins(self):
 100         jsi = JSInterpreter('function f() { return NaN }')
 101         self.assertTrue(math.isnan(jsi.call_function('f')))
 102
 103         self._test('function f() { return new Date("Wednesday 31 December 1969 18:01:26 MDT") - 0; }',
 104                    86000)
 105         self._test('function f(dt) { return new Date(dt) - 0; }',
 106                    86000, args=['Wednesday 31 December 1969 18:01:26 MDT'])
 107
 108     def test_call(self):
 109         jsi = JSInterpreter('''
 110             function x() { return 2; }
 111             function y(a) { return x() + (a?a:0); }
 112             function z() { return y(3); }
 113         ''')
 114         self.assertEqual(jsi.call_function('z'), 5)
 115         self.assertEqual(jsi.call_function('y'), 2)
 116
 117     def test_if(self):
 118         self._test('''
 119             function f() {
 120                 let a = 9;
 121                 if (0==0) {a++}
 122                 return a
 123             }
 124         ''', 10)
 125
 126         self._test('''
 127             function f() {
 128                 if (0==0) {return 10}
 129             }
 130         ''', 10)
 131
 132         self._test('''
 133             function f() {
 134                 if (0!=0) {return 1}
 135                 else {return 10}
 136             }
 137         ''', 10)
 138
 139         """  # Unsupported
 140         self._test('''
 141             function f() {
 142                 if (0!=0) {return 1}
 143                 else if (1==0) {return 2}
 144                 else {return 10}
 145             }
 146         ''', 10)
 147         """
 148
 149     def test_for_loop(self):
 150         self._test('function f() { a=0; for (i=0; i-10; i++) {a++} return a }', 10)
 151
 152     def test_switch(self):
 153         jsi = JSInterpreter('''
 154             function f(x) { switch(x){
 155                 case 1:x+=1;
 156                 case 2:x+=2;
 157                 case 3:x+=3;break;
 158                 case 4:x+=4;
 159                 default:x=0;
 160             } return x }
 161         ''')
 162         self.assertEqual(jsi.call_function('f', 1), 7)
 163         self.assertEqual(jsi.call_function('f', 3), 6)
 164         self.assertEqual(jsi.call_function('f', 5), 0)
 165
 166     def test_switch_default(self):
 167         jsi = JSInterpreter('''
 168             function f(x) { switch(x){
 169                 case 2: x+=2;
 170                 default: x-=1;
 171                 case 5:
 172                 case 6: x+=6;
 173                 case 0: break;
 174                 case 1: x+=1;
 175             } return x }
 176         ''')
 177         self.assertEqual(jsi.call_function('f', 1), 2)
 178         self.assertEqual(jsi.call_function('f', 5), 11)
 179         self.assertEqual(jsi.call_function('f', 9), 14)
 180
 181     def test_try(self):
 182         self._test('function f() { try{return 10} catch(e){return 5} }', 10)
 183
 184     def test_catch(self):
 185         self._test('function f() { try{throw 10} catch(e){return 5} }', 5)
 186
 187     def test_finally(self):
 188         self._test('function f() { try{throw 10} finally {return 42} }', 42)
 189         self._test('function f() { try{throw 10} catch(e){return 5} finally {return 42} }', 42)
 190
 191     def test_nested_try(self):
 192         self._test('''
 193             function f() {try {
 194                 try{throw 10} finally {throw 42}
 195                 } catch(e){return 5} }
 196         ''', 5)
 197
 198     def test_for_loop_continue(self):
 199         self._test('function f() { a=0; for (i=0; i-10; i++) { continue; a++ } return a }', 0)
 200
 201     def test_for_loop_break(self):
 202         self._test('function f() { a=0; for (i=0; i-10; i++) { break; a++ } return a }', 0)
 203
 204     def test_for_loop_try(self):
 205         self._test('''
 206             function f() {
 207                 for (i=0; i-10; i++) { try { if (i == 5) throw i} catch {return 10} finally {break} };
 208                 return 42 }
 209         ''', 42)
 210
 211     def test_literal_list(self):
 212         self._test('function f() { return [1, 2, "asdf", [5, 6, 7]][3] }', [5, 6, 7])
 213
 214     def test_comma(self):
 215         self._test('function f() { a=5; a -= 1, a+=3; return a }', 7)
 216         self._test('function f() { a=5; return (a -= 1, a+=3, a); }', 7)
 217         self._test('function f() { return (l=[0,1,2,3], function(a, b){return a+b})((l[1], l[2]), l[3]) }', 5)
 218
 219     def test_void(self):
 220         self._test('function f() { return void 42; }', None)
 221
 222     def test_return_function(self):
 223         jsi = JSInterpreter('''
 224             function f() { return [1, function(){return 1}][1] }
 225         ''')
 226         self.assertEqual(jsi.call_function('f')([]), 1)
 227
 228     def test_null(self):
 229         self._test('function f() { return null; }', None)
 230         self._test('function f() { return [null > 0, null < 0, null == 0, null === 0]; }',
 231                    [False, False, False, False])
 232         self._test('function f() { return [null >= 0, null <= 0]; }', [True, True])
 233
 234     def test_undefined(self):
 235         self._test('function f() { return undefined === undefined; }', True)
 236         self._test('function f() { return undefined; }', JS_Undefined)
 237         self._test('function f() {return undefined ?? 42; }', 42)
 238         self._test('function f() { let v; return v; }', JS_Undefined)
 239         self._test('function f() { let v; return v**0; }', 1)
 240         self._test('function f() { let v; return [v>42, v<=42, v&&42, 42&&v]; }',
 241                    [False, False, JS_Undefined, JS_Undefined])
 242
 243         self._test('''
 244             function f() { return [
 245                 undefined === undefined,
 246                 undefined == undefined,
 247                 undefined == null,
 248                 undefined < undefined,
 249                 undefined > undefined,
 250                 undefined === 0,
 251                 undefined == 0,
 252                 undefined < 0,
 253                 undefined > 0,
 254                 undefined >= 0,
 255                 undefined <= 0,
 256                 undefined > null,
 257                 undefined < null,
 258                 undefined === null
 259             ]; }
 260         ''', list(map(bool, (1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))))
 261
 262         jsi = JSInterpreter('''
 263             function f() { let v; return [42+v, v+42, v**42, 42**v, 0**v]; }
 264         ''')
 265         for y in jsi.call_function('f'):
 266             self.assertTrue(math.isnan(y))
 267
 268     def test_object(self):
 269         self._test('function f() { return {}; }', {})
 270         self._test('function f() { let a = {m1: 42, m2: 0 }; return [a["m1"], a.m2]; }', [42, 0])
 271         self._test('function f() { let a; return a?.qq; }', JS_Undefined)
 272         self._test('function f() { let a = {m1: 42, m2: 0 }; return a?.qq; }', JS_Undefined)
 273
 274     def test_regex(self):
 275         self._test('function f() { let a=/,,[/,913,/](,)}/; }', None)
 276
 277         jsi = JSInterpreter('function f() { let a=/,,[/,913,/](,)}/; return a; }')
 278         self.assertIsInstance(jsi.call_function('f'), re.Pattern)
 279
 280         jsi = JSInterpreter('function f() { let a=/,,[/,913,/](,)}/i; return a; }')
 281         self.assertEqual(jsi.call_function('f').flags & re.I, re.I)
 282
 283         jsi = JSInterpreter(R'function f() { let a=/,][}",],()}(\[)/; return a; }')
 284         self.assertEqual(jsi.call_function('f').pattern, r',][}",],()}(\[)')
 285
 286         jsi = JSInterpreter(R'function f() { let a=[/[)\\]/]; return a[0]; }')
 287         self.assertEqual(jsi.call_function('f').pattern, r'[)\\]')
 288
 289     def test_char_code_at(self):
 290         jsi = JSInterpreter('function f(i){return "test".charCodeAt(i)}')
 291         self.assertEqual(jsi.call_function('f', 0), 116)
 292         self.assertEqual(jsi.call_function('f', 1), 101)
 293         self.assertEqual(jsi.call_function('f', 2), 115)
 294         self.assertEqual(jsi.call_function('f', 3), 116)
 295         self.assertEqual(jsi.call_function('f', 4), None)
 296         self.assertEqual(jsi.call_function('f', 'not_a_number'), 116)
 297
 298     def test_bitwise_operators_overflow(self):
 299         self._test('function f(){return -524999584 << 5}', 379882496)
 300         self._test('function f(){return 1236566549 << 5}', 915423904)
 301
 302     def test_bitwise_operators_typecast(self):
 303         self._test('function f(){return null << 5}', 0)
 304         self._test('function f(){return undefined >> 5}', 0)
 305         self._test('function f(){return 42 << NaN}', 42)
 306
 307     def test_negative(self):
 308         self._test('function f(){return 2    *    -2.0    ;}', -4)
 309         self._test('function f(){return 2    -    - -2    ;}', 0)
 310         self._test('function f(){return 2    -    - - -2  ;}', 4)
 311         self._test('function f(){return 2    -    + + - -2;}', 0)
 312         self._test('function f(){return 2    +    - + - -2;}', 0)
 313
 314
 315 if __name__ == '__main__':
 316     unittest.main()