strconv: implement strconv.format_int(n, radix) and strconv.format_uint(n,radix)

pull/7863/head
Delyan Angelov 2021-01-04 15:48:51 +02:00
parent a8a81a1708
commit 22085041f1
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2 changed files with 85 additions and 0 deletions

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module strconv
const base_digits = '0123456789abcdefghijklmnopqrstuvwxyz'
// format_int returns the string representation of the number n in base `radix`
// for digit values > 10, this function uses the small latin leters a-z.
pub fn format_int(n i64, radix int) string {
if radix < 2 || radix > 36 {
panic('invalid radix: $radix . It should be => 2 and <= 36')
}
if n == 0 {
return '0'
}
mut n_copy := n
mut sign := ''
if n < 0 {
sign = '-'
n_copy = -n_copy
}
mut res := ''
for n_copy != 0 {
res = base_digits[n_copy % radix].str() + res
n_copy /= radix
}
return '$sign$res'
}
// format_uint returns the string representation of the number n in base `radix`
// for digit values > 10, this function uses the small latin leters a-z.
pub fn format_uint(n u64, radix int) string {
if radix < 2 || radix > 36 {
panic('invalid radix: $radix . It should be => 2 and <= 36')
}
if n == 0 {
return '0'
}
mut n_copy := n
mut res := ''
uradix := u64(radix)
for n_copy != 0 {
res = base_digits[n_copy % uradix].str() + res
n_copy /= uradix
}
return res
}

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import strconv
fn test_format_int() {
assert strconv.format_int(0, 2) == '0'
assert strconv.format_int(0, 10) == '0'
assert strconv.format_int(0, 16) == '0'
assert strconv.format_int(0, 36) == '0'
assert strconv.format_int(1, 2) == '1'
assert strconv.format_int(1, 10) == '1'
assert strconv.format_int(1, 16) == '1'
assert strconv.format_int(1, 36) == '1'
assert strconv.format_int(-1, 2) == '-1'
assert strconv.format_int(-1, 10) == '-1'
assert strconv.format_int(-1, 16) == '-1'
assert strconv.format_int(-1, 36) == '-1'
assert strconv.format_int(255, 2) == '11111111'
assert strconv.format_int(255, 8) == '377'
assert strconv.format_int(255, 10) == '255'
assert strconv.format_int(255, 16) == 'ff'
assert strconv.format_int(-255, 2) == '-11111111'
assert strconv.format_int(-255, 8) == '-377'
assert strconv.format_int(-255, 10) == '-255'
assert strconv.format_int(-255, 16) == '-ff'
for i in -256 .. 256 {
assert strconv.format_int(i, 10) == i.str()
}
}
fn test_format_uint() {
assert strconv.format_uint(0, 2) == '0'
assert strconv.format_int(255, 2) == '11111111'
assert strconv.format_int(255, 8) == '377'
assert strconv.format_int(255, 10) == '255'
assert strconv.format_int(255, 16) == 'ff'
assert strconv.format_uint(18446744073709551615, 2) ==
'1111111111111111111111111111111111111111111111111111111111111111'
assert strconv.format_uint(18446744073709551615, 16) == 'ffffffffffffffff'
assert strconv.parse_int('baobab', 36, 64) == 683058467
assert strconv.format_uint(683058467, 36) == 'baobab'
}