forked from jashkenas/coffeescript
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathslicing_and_splicing.coffee
More file actions
155 lines (115 loc) · 3.4 KB
/
Copy pathslicing_and_splicing.coffee
File metadata and controls
155 lines (115 loc) · 3.4 KB
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
# Slicing and Splicing
# --------------------
# * Slicing
# * Splicing
# shared array
shared = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# Slicing
test "basic slicing", ->
arrayEq [7, 8, 9] , shared[7..9]
arrayEq [2, 3] , shared[2...4]
arrayEq [2, 3, 4, 5], shared[2...6]
test "slicing with variables as endpoints", ->
[a, b] = [1, 4]
arrayEq [1, 2, 3, 4], shared[a..b]
arrayEq [1, 2, 3] , shared[a...b]
test "slicing with expressions as endpoints", ->
[a, b] = [1, 3]
arrayEq [2, 3, 4, 5, 6], shared[(a+1)..2*b]
arrayEq [2, 3, 4, 5] , shared[a+1...(2*b)]
test "unbounded slicing", ->
arrayEq [7, 8, 9] , shared[7..]
arrayEq [8, 9] , shared[-2..]
arrayEq [9] , shared[-1...]
arrayEq [0, 1, 2] , shared[...3]
arrayEq [0, 1, 2, 3], shared[..-7]
arrayEq shared , shared[..-1]
arrayEq shared[0..8], shared[...-1]
for a in [-shared.length..shared.length]
arrayEq shared[a..] , shared[a...]
for a in [-shared.length+1...shared.length]
arrayEq shared[..a][...-1] , shared[...a]
arrayEq [1, 2, 3], [1, 2, 3][..]
test "#930, #835, #831, #746 #624: inclusive slices to -1 should slice to end", ->
arrayEq shared, shared[0..-1]
arrayEq shared, shared[..-1]
arrayEq shared.slice(1,shared.length), shared[1..-1]
test "string slicing", ->
str = "abcdefghijklmnopqrstuvwxyz"
ok str[1...1] is ""
ok str[1..1] is "b"
ok str[1...5] is "bcde"
ok str[0..4] is "abcde"
ok str[-5..] is "vwxyz"
test "#1722: operator precedence in unbounded slice compilation", ->
list = [0..9]
n = 2 # some truthy number in `list`
arrayEq [0..n], list[..n]
arrayEq [0..n], list[..n or 0]
arrayEq [0..n], list[..if n then n else 0]
test "#2349: inclusive slicing to numeric strings", ->
arrayEq [0, 1], [0..10][.."1"]
# Splicing
test "basic splicing", ->
ary = [0..9]
ary[5..9] = [0, 0, 0]
arrayEq [0, 1, 2, 3, 4, 0, 0, 0], ary
ary = [0..9]
ary[2...8] = []
arrayEq [0, 1, 8, 9], ary
test "unbounded splicing", ->
ary = [0..9]
ary[3..] = [9, 8, 7]
arrayEq [0, 1, 2, 9, 8, 7]. ary
ary[...3] = [7, 8, 9]
arrayEq [7, 8, 9, 9, 8, 7], ary
ary[..] = [1, 2, 3]
arrayEq [1, 2, 3], ary
test "splicing with variables as endpoints", ->
[a, b] = [1, 8]
ary = [0..9]
ary[a..b] = [2, 3]
arrayEq [0, 2, 3, 9], ary
ary = [0..9]
ary[a...b] = [5]
arrayEq [0, 5, 8, 9], ary
test "splicing with expressions as endpoints", ->
[a, b] = [1, 3]
ary = [0..9]
ary[ a+1 .. 2*b+1 ] = [4]
arrayEq [0, 1, 4, 8, 9], ary
ary = [0..9]
ary[a+1...2*b+1] = [4]
arrayEq [0, 1, 4, 7, 8, 9], ary
test "splicing to the end, against a one-time function", ->
ary = null
fn = ->
if ary
throw 'err'
else
ary = [1, 2, 3]
fn()[0..] = 1
arrayEq ary, [1]
test "the return value of a splice literal should be the RHS", ->
ary = [0, 0, 0]
eq (ary[0..1] = 2), 2
ary = [0, 0, 0]
eq (ary[0..] = 3), 3
arrayEq [ary[0..0] = 0], [0]
test "#1723: operator precedence in unbounded splice compilation", ->
n = 4 # some truthy number in `list`
list = [0..9]
list[..n] = n
arrayEq [n..9], list
list = [0..9]
list[..n or 0] = n
arrayEq [n..9], list
list = [0..9]
list[..if n then n else 0] = n
arrayEq [n..9], list
test "#2953: methods on endpoints in assignment from array splice literal", ->
list = [0..9]
Number.prototype.same = -> this
list[1.same()...9.same()] = 5
delete Number.prototype.same
arrayEq [0, 5, 9], list