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