v / vlib / strings
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1import strings
2
3type MyInt = int
4
5const maxn = 100000
6
7fn test_sb() {
8 mut sb := strings.new_builder(100)
9 sb.write_string('hi')
10 sb.write_string('!')
11 sb.write_string('hello')
12 assert sb.len == 8
13 sb_end := sb.str()
14 assert sb_end == 'hi!hello'
15 assert sb.len == 0
16 ///
17 sb = strings.new_builder(10)
18 sb.write_string('a')
19 sb.write_string('b')
20 assert sb.len == 2
21 assert sb.str() == 'ab'
22 // Test interpolation optimization
23 sb = strings.new_builder(10)
24 x := 10
25 y := MyInt(20)
26 sb.writeln('x = ${x} y = ${y}')
27 res := sb.str()
28 assert res[res.len - 1] == `\n`
29 println('"${res}"')
30 assert res.trim_space() == 'x = 10 y = 20'
31 //
32 sb = strings.new_builder(10)
33 sb.write_string('x = ${x} y = ${y}')
34 assert sb.str() == 'x = 10 y = 20'
35 //$if !windows {
36 sb = strings.new_builder(10)
37 sb.write_string('123456')
38 last_2 := sb.cut_last(2)
39 assert last_2 == '56'
40 final_sb := sb.str()
41 assert final_sb == '1234'
42
43 sb.clear()
44 assert sb.str() == ''
45 //}
46}
47
48fn test_big_sb() {
49 mut sb := strings.new_builder(100)
50 mut sb2 := strings.new_builder(10000)
51 for i in 0 .. maxn {
52 sb.writeln(i.str())
53 sb2.write_string('+')
54 }
55 s := sb.str()
56 lines := s.split_into_lines()
57 assert lines.len == maxn
58 assert lines[0] == '0'
59 assert lines[1] == '1'
60 assert lines[777] == '777'
61 assert lines[98765] == '98765'
62 println(sb2.len)
63 assert sb2.len == maxn
64}
65
66fn test_byte_write() {
67 mut sb := strings.new_builder(100)
68 temp_str := 'byte testing'
69 mut count := 0
70 for word in temp_str {
71 sb.write_u8(word)
72 count++
73 assert count == sb.len
74 }
75 sb_final := sb.str()
76 assert sb_final == temp_str
77}
78
79fn test_strings_builder_reuse() {
80 mut sb := strings.new_builder(256)
81 sb.write_string('world')
82 assert sb.str() == 'world'
83 sb.write_string('hello')
84 assert sb.str() == 'hello'
85}
86
87fn test_cut_to() {
88 mut sb := strings.new_builder(16)
89 sb.write_string('hello')
90 assert sb.cut_to(3) == 'lo'
91 assert sb.len == 3
92 assert sb.cut_to(3) == ''
93 assert sb.len == 3
94 assert sb.cut_to(0) == 'hel'
95 assert sb.cut_to(32) == ''
96 assert sb.len == 0
97}