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v/vlib/strconv/format_mem.c.v

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/*=============================================================================
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Copyright (c) 2019-2022 Dario Deledda. All rights reserved.
Use of this source code is governed by an MIT license
that can be found in the LICENSE file.
This file contains string interpolation V functions
=============================================================================*/
module strconv
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import strings
// format_str_sb is a `strings.Builder` version of `format_str`.
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
}
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if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
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sb.write_u8(p.pad_ch)
}
}
sb.write_string(s)
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
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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 formats an u64 using a `strings.Builder`.
[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 {
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res.write_u8(`+`)
sign_written = true
}
} else {
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res.write_u8(`-`)
sign_written = true
}
}
// write the pad chars
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for i1 := 0; i1 < dif; i1++ {
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res.write_u8(p.pad_ch)
}
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}
if !sign_written {
// no pad char, write the sign before the number
if p.positive {
if p.sign_flag {
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res.write_u8(`+`)
}
} else {
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res.write_u8(`-`)
}
}
/*
// Legacy version
// max u64 18446744073709551615 => 20 byte
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mut buf := [32]u8{}
mut i := 20
mut d1 := d
for i >= (21 - n_char) {
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buf[i] = u8(d1 % 10) + `0`
d1 = d1 / 10
i--
}
i++
*/
//===========================================
// Speed version
// max u64 18446744073709551615 => 20 byte
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mut buf := [32]u8{}
mut i := 20
mut n := d
mut d_i := u64(0)
if n > 0 {
for n > 0 {
n1 := n / 100
// calculate the digit_pairs start index
d_i = (n - (n1 * 100)) << 1
n = n1
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unsafe {
buf[i] = strconv.digit_pairs.str[d_i]
}
i--
d_i++
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unsafe {
buf[i] = strconv.digit_pairs.str[d_i]
}
i--
}
i++
// remove head zero
if d_i < 20 {
i++
}
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unsafe { res.write_ptr(&buf[i], n_char) }
} else {
// we have a zero no need of more code!
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res.write_u8(`0`)
}
//===========================================
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
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res.write_u8(p.pad_ch)
}
}
return
}
// f64_to_str_lnd1 formats a f64 to a `string` with `dec_digit` digits after the dot.
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[direct_array_access; manualfree]
fn f64_to_str_lnd1(f f64, dec_digit int) string {
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unsafe {
// we add the rounding value
s := f64_to_str(f + dec_round[dec_digit], 18)
// check for +inf -inf Nan
if s.len > 2 && (s[0] == `n` || s[1] == `i`) {
return s
}
m_sgn_flag := false
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mut sgn := 1
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mut b := [26]u8{}
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mut d_pos := 1
mut i := 0
mut i1 := 0
mut exp := 0
mut exp_sgn := 1
mut dot_res_sp := -1
// get sign and decimal parts
for c in s {
match c {
`-` {
sgn = -1
i++
}
`+` {
sgn = 1
i++
}
`0`...`9` {
b[i1] = c
i1++
i++
}
`.` {
if sgn > 0 {
d_pos = i
} else {
d_pos = i - 1
}
i++
}
`e` {
i++
break
}
else {
s.free()
return '[Float conversion error!!]'
}
}
}
b[i1] = 0
// get exponent
if s[i] == `-` {
exp_sgn = -1
i++
} else if s[i] == `+` {
exp_sgn = 1
i++
}
mut c := i
for c < s.len {
exp = exp * 10 + int(s[c] - `0`)
c++
}
// allocate exp+32 chars for the return string
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// mut res := []u8{len:exp+32,init:`0`}
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mut res := []u8{len: exp + 32, init: 0}
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mut r_i := 0 // result string buffer index
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// println("s:${sgn} b:${b[0]} es:${exp_sgn} exp:${exp}")
// s no more needed
s.free()
if sgn == 1 {
if m_sgn_flag {
res[r_i] = `+`
r_i++
}
} else {
res[r_i] = `-`
r_i++
}
i = 0
if exp_sgn >= 0 {
for b[i] != 0 {
res[r_i] = b[i]
r_i++
i++
if i >= d_pos && exp >= 0 {
if exp == 0 {
dot_res_sp = r_i
res[r_i] = `.`
r_i++
}
exp--
}
}
for exp >= 0 {
res[r_i] = `0`
r_i++
exp--
}
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// println("exp: $exp $r_i $dot_res_sp")
} else {
mut dot_p := true
for exp > 0 {
res[r_i] = `0`
r_i++
exp--
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if dot_p {
dot_res_sp = r_i
res[r_i] = `.`
r_i++
dot_p = false
}
}
for b[i] != 0 {
res[r_i] = b[i]
r_i++
i++
}
}
// no more digits needed, stop here
if dec_digit <= 0 {
// C.printf(c'f: %f, i: %d, res.data: %p | dot_res_sp: %d | *(res.data): %s \n', f, i, res.data, dot_res_sp, res.data)
if dot_res_sp < 0 {
dot_res_sp = i + 1
}
tmp_res := tos(res.data, dot_res_sp).clone()
res.free()
return tmp_res
}
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// println("r_i-d_pos: ${r_i - d_pos}")
if dot_res_sp >= 0 {
r_i = dot_res_sp + dec_digit + 1
res[r_i] = 0
for c1 in 1 .. dec_digit + 1 {
if res[r_i - c1] == 0 {
res[r_i - c1] = `0`
}
}
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// println("result: [${tos(&res[0],r_i)}]")
tmp_res := tos(res.data, r_i).clone()
res.free()
return tmp_res
} else {
if dec_digit > 0 {
mut c1 := 0
res[r_i] = `.`
r_i++
for c1 < dec_digit {
res[r_i] = `0`
r_i++
c1++
}
res[r_i] = 0
}
tmp_res := tos(res.data, r_i).clone()
res.free()
return tmp_res
}
}
}
// format_fl is a `strings.Builder` version of format_fl.
[direct_array_access; manualfree]
pub fn format_fl(f f64, p BF_param) string {
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unsafe {
mut fs := f64_to_str_lnd1(if f >= 0.0 { f } else { -f }, p.len1)
// error!!
if fs[0] == `[` {
return fs
}
if p.rm_tail_zero {
tmp := fs
fs = remove_tail_zeros(fs)
tmp.free()
}
mut buf := [strconv.max_size_f64_char]u8{} // write temp float buffer in stack
mut out := [strconv.max_size_f64_char]u8{} // out buffer
mut buf_i := 0 // index temporary string
mut out_i := 0 // index output string
mut sign_len_diff := 0
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
out[out_i] = `+`
out_i++
sign_len_diff = -1
}
} else {
out[out_i] = `-`
out_i++
sign_len_diff = -1
}
} else {
if p.positive {
if p.sign_flag {
buf[buf_i] = `+`
buf_i++
}
} else {
buf[buf_i] = `-`
buf_i++
}
}
// copy the float
vmemcpy(&buf[buf_i], fs.str, fs.len)
buf_i += fs.len
// make the padding if needed
dif := p.len0 - buf_i + sign_len_diff
if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
out[out_i] = p.pad_ch
out_i++
}
}
vmemcpy(&out[out_i], &buf[0], buf_i)
out_i += buf_i
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
out[out_i] = p.pad_ch
out_i++
}
}
out[out_i] = 0
// return and free
tmp := fs
fs = tos_clone(&out[0])
tmp.free()
return fs
}
}
// format_es returns a f64 as a `string` formatted according to the options set in `p`.
[direct_array_access; manualfree]
pub fn format_es(f f64, p BF_param) string {
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unsafe {
mut fs := f64_to_str_pad(if f > 0 { f } else { -f }, p.len1)
if p.rm_tail_zero {
tmp := fs
fs = remove_tail_zeros(fs)
tmp.free()
}
mut buf := [strconv.max_size_f64_char]u8{} // write temp float buffer in stack
mut out := [strconv.max_size_f64_char]u8{} // out buffer
mut buf_i := 0 // index temporary string
mut out_i := 0 // index output string
mut sign_len_diff := 0
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
out[out_i] = `+`
out_i++
sign_len_diff = -1
}
} else {
out[out_i] = `-`
out_i++
sign_len_diff = -1
}
} else {
if p.positive {
if p.sign_flag {
buf[buf_i] = `+`
buf_i++
}
} else {
buf[buf_i] = `-`
buf_i++
}
}
// copy the float
vmemcpy(&buf[buf_i], fs.str, fs.len)
buf_i += fs.len
// make the padding if needed
dif := p.len0 - buf_i + sign_len_diff
if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
out[out_i] = p.pad_ch
out_i++
}
}
vmemcpy(&out[out_i], &buf[0], buf_i)
out_i += buf_i
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
out[out_i] = p.pad_ch
out_i++
}
}
out[out_i] = 0
// return and free
tmp := fs
fs = tos_clone(&out[0])
tmp.free()
return fs
}
}
// remove_tail_zeros strips traling zeros from `s` and return the resulting `string`.
[direct_array_access]
pub fn remove_tail_zeros(s string) string {
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unsafe {
mut buf := malloc_noscan(s.len + 1)
mut i_d := 0
mut i_s := 0
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// skip spaces
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for i_s < s.len && s[i_s] !in [`-`, `+`] && (s[i_s] > `9` || s[i_s] < `0`) {
buf[i_d] = s[i_s]
i_s++
i_d++
}
// sign
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if i_s < s.len && s[i_s] in [`-`, `+`] {
buf[i_d] = s[i_s]
i_s++
i_d++
}
// integer part
for i_s < s.len && s[i_s] >= `0` && s[i_s] <= `9` {
buf[i_d] = s[i_s]
i_s++
i_d++
}
// check decimals
if i_s < s.len && s[i_s] == `.` {
mut i_s1 := i_s + 1
mut sum := 0
for i_s1 < s.len && s[i_s1] >= `0` && s[i_s1] <= `9` {
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sum += s[i_s1] - u8(`0`)
i_s1++
}
// decimal part must be copied
if sum > 0 {
for c_i in i_s .. i_s1 {
buf[i_d] = s[c_i]
i_d++
}
}
i_s = i_s1
}
if i_s < s.len && s[i_s] != `.` {
// check exponent
for {
buf[i_d] = s[i_s]
i_s++
i_d++
if i_s >= s.len {
break
}
}
}
buf[i_d] = 0
return tos(buf, i_d)
}
}