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v/vlib/strconv/format_mem.js.v
2022-04-15 18:25:45 +03:00

104 lines
2.0 KiB
V

module strconv
import strings
pub fn format_str_sb(s string, p BF_param, mut sb strings.Builder) {
if p.len0 <= 0 {
sb.write_string(s)
return
}
dif := p.len0 - utf8_str_visible_length(s)
if dif <= 0 {
sb.write_string(s)
return
}
if p.allign == .right {
for i1 := 0; i1 < dif; i1++ {
sb.write_u8(p.pad_ch)
}
}
sb.write_string(s)
if p.allign == .left {
for i1 := 0; i1 < dif; i1++ {
sb.write_u8(p.pad_ch)
}
}
}
const (
max_size_f64_char = 32 // the f64 max representation is -36,028,797,018,963,968e1023, 21 chars, 32 is faster for the memory manger
// digit pairs in reverse order
digit_pairs = '00102030405060708090011121314151617181910212223242526272829203132333435363738393041424344454647484940515253545556575859506162636465666768696071727374757677787970818283848586878889809192939495969798999'
)
// format_dec_sb format a u64
[direct_array_access]
pub fn format_dec_sb(d u64, p BF_param, mut res strings.Builder) {
mut n_char := dec_digits(d)
sign_len := if !p.positive || p.sign_flag { 1 } else { 0 }
number_len := sign_len + n_char
dif := p.len0 - number_len
mut sign_written := false
if p.allign == .right {
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
res.write_u8(`+`)
sign_written = true
}
} else {
res.write_u8(`-`)
sign_written = true
}
}
// write the pad chars
for i1 := 0; i1 < dif; i1++ {
res.write_u8(p.pad_ch)
}
}
if !sign_written {
// no pad char, write the sign before the number
if p.positive {
if p.sign_flag {
res.write_u8(`+`)
}
} else {
res.write_u8(`-`)
}
}
// Legacy version
// max u64 18446744073709551615 => 20 byte
mut buf := [32]u8{}
mut i := 20
mut d1 := d
for i >= (21 - n_char) {
buf[i] = u8(d1 % 10) + `0`
d1 = d1 / 10
i--
}
for _ in 0 .. n_char {
i++
res.write_u8(buf[i])
}
i++
//===========================================
if p.allign == .left {
for i1 := 0; i1 < dif; i1++ {
res.write_u8(p.pad_ch)
}
}
return
}