860 lines
17 KiB
V
860 lines
17 KiB
V
/*
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printf/sprintf V implementation
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Copyright (c) 2020 Dario Deledda. All rights reserved.
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Use of this source code is governed by an MIT license
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that can be found in the LICENSE file.
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This file contains the printf/sprintf functions
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*/
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module strconv
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import strings
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enum Char_parse_state {
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start
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norm_char
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field_char
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pad_ch
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len_set_start
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len_set_in
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check_type
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check_float
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check_float_in
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reset_params
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}
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enum Align_text {
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right = 0
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left
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center
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}
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/*
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Float conversion utility
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*/
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const(
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// rounding value
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dec_round = [
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f64(0.44),
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0.044,
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0.0044,
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0.00044,
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0.000044,
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0.0000044,
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0.00000044,
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0.000000044,
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0.0000000044,
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0.00000000044,
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0.000000000044,
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0.0000000000044,
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0.00000000000044,
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0.000000000000044,
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0.0000000000000044,
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0.00000000000000044,
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0.000000000000000044,
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0.0000000000000000044,
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0.00000000000000000044,
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0.000000000000000000044,
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]
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)
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// max float 1.797693134862315708145274237317043567981e+308
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pub fn f64_to_str_lnd(f f64, dec_digit int) string {
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// we add the rounding value
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s := f64_to_str(f + dec_round[dec_digit], 18)
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// check for +inf -inf Nan
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if s.len > 2 && (s[0] == `n` || s[1] == `i`) {
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return s
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}
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m_sgn_flag := false
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mut sgn := 1
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mut b := [26]byte{}
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mut d_pos := 1
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mut i := 0
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mut i1 := 0
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mut exp := 0
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mut exp_sgn := 1
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mut dot_res_sp := -1
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// get sign and deciaml parts
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for c in s {
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if c == `-` {
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sgn = -1
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i++
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} else if c == `+` {
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sgn = 1
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i++
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}
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else if c >= `0` && c <= `9` {
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b[i1++] = c
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i++
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} else if c == `.` {
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if sgn > 0 {
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d_pos = i
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} else {
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d_pos = i-1
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}
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i++
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} else if c == `e` {
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i++
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break
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} else {
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return "[Float conversion error!!]"
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}
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}
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b[i1] = 0
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// get exponent
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if s[i] == `-` {
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exp_sgn = -1
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i++
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} else if s[i] == `+` {
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exp_sgn = 1
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i++
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}
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for c in s[i..] {
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exp = exp * 10 + int(c-`0`)
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}
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// allocate exp+32 chars for the return string
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//mut res := []byte{len:exp+32,init:`0`}
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mut res := []byte{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}")
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if sgn == 1 {
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if m_sgn_flag {
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res[r_i++] = `+`
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}
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} else {
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res[r_i++] = `-`
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}
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i = 0
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if exp_sgn >= 0 {
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for b[i] != 0 {
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res[r_i++] = b[i]
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i++
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if i >= d_pos && exp >= 0 {
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if exp == 0 {
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dot_res_sp = r_i
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res[r_i++] = `.`
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}
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exp--
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}
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}
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for exp >= 0 {
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res[r_i++] = `0`
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exp--
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}
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//println("exp: $exp $r_i $dot_res_sp")
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} else {
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mut dot_p := true
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for exp > 0 {
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res[r_i++] = `0`
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exp--
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if dot_p {
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dot_res_sp = r_i
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res[r_i++] = `.`
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dot_p = false
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}
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}
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for b[i] != 0 {
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res[r_i++] = b[i]
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i++
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}
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}
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//println("r_i-d_pos: ${r_i - d_pos}")
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if dot_res_sp >= 0 {
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if (r_i - dot_res_sp) > dec_digit {
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r_i = dot_res_sp + dec_digit + 1
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}
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res[r_i] = 0
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//println("result: [${tos(&res[0],r_i)}]")
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return tos(res.data, r_i)
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} else {
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if dec_digit > 0 {
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mut c := 0
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res[r_i++] = `.`
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for c < dec_digit {
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res[r_i++] = `0`
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c++
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}
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res[r_i] = 0
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}
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return tos(res.data, r_i)
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}
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}
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/*
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Single format functions
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*/
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pub struct BF_param {
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pad_ch byte = byte(` `) // padding char
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len0 int = -1 // default len for whole the number or string
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len1 int = 6 // number of decimal digits, if needed
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positive bool = true // mandatory: the sign of the number passed
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sign_flag bool // flag for print sign as prefix in padding
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allign Align_text = .right // alignment of the string
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rm_tail_zero bool // remove the tail zeros from floats
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}
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pub fn format_str(s string, p BF_param) string {
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dif := p.len0 - s.len
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if dif <= 0 {
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return s
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}
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mut res := strings.new_builder(s.len + dif)
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if p.allign == .right {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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res.write(s)
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if p.allign == .left {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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return res.str()
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}
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// max int64 9223372036854775807
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pub fn format_dec(d u64, p BF_param) string {
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mut s := ""
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mut res := strings.new_builder(20)
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mut sign_len_diff := 0
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if p.pad_ch == `0` {
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if p.positive {
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if p.sign_flag {
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res.write_b(`+`)
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sign_len_diff = -1
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}
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} else {
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res.write_b(`-`)
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sign_len_diff = -1
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}
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s = d.str()
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} else {
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if p.positive {
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if p.sign_flag {
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s = "+" + d.str()
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} else {
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s = d.str()
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}
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} else {
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s = "-" + d.str()
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}
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}
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dif := p.len0 - s.len + sign_len_diff
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if p.allign == .right {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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res.write(s)
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if p.allign == .left {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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return res.str()
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}
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pub fn format_fl(f f64, p BF_param) string {
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mut s := ""
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mut fs := f64_to_str_lnd(if f >= 0.0 {f} else {-f}, p.len1)
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// error!!
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if fs[0] == `[` {
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return fs
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}
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if p.rm_tail_zero {
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fs = remove_tail_zeros(fs)
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}
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mut res := strings.new_builder( if p.len0 > fs.len { p.len0 } else { fs.len })
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mut sign_len_diff := 0
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if p.pad_ch == `0` {
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if p.positive {
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if p.sign_flag {
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res.write_b(`+`)
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sign_len_diff = -1
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}
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} else {
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res.write_b(`-`)
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sign_len_diff = -1
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}
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s = fs
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} else {
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if p.positive {
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if p.sign_flag {
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s = "+" + fs
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} else {
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s = fs
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}
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} else {
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s = "-" + fs
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}
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}
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dif := p.len0 - s.len + sign_len_diff
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if p.allign == .right {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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res.write(s)
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if p.allign == .left {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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return res.str()
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}
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pub fn format_es(f f64, p BF_param) string {
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mut s := ""
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mut fs := f64_to_str_pad(if f> 0 {f} else {-f},p.len1)
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if p.rm_tail_zero {
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fs = remove_tail_zeros(fs)
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}
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mut res := strings.new_builder( if p.len0 > fs.len { p.len0 } else { fs.len })
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mut sign_len_diff := 0
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if p.pad_ch == `0` {
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if p.positive {
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if p.sign_flag {
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res.write_b(`+`)
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sign_len_diff = -1
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}
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} else {
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res.write_b(`-`)
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sign_len_diff = -1
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}
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s = fs
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} else {
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if p.positive {
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if p.sign_flag {
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s = "+" + fs
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} else {
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s = fs
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}
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} else {
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s = "-" + fs
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}
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}
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dif := p.len0 - s.len + sign_len_diff
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if p.allign == .right {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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res.write(s)
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if p.allign == .left {
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for i1 :=0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
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}
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}
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return res.str()
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}
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pub fn remove_tail_zeros(s string) string {
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mut i := 0
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mut last_zero_start := -1
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mut dot_pos := -1
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mut in_decimal := false
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mut prev_ch := byte(0)
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for i < s.len {
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ch := unsafe {s.str[i]}
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if ch == `.` {
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in_decimal = true
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dot_pos = i
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}
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else if in_decimal {
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if ch == `0` && prev_ch != `0` {
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last_zero_start = i
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} else if ch >= `1` && ch <= `9` {
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last_zero_start = -1
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} else if ch == `e` {
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break
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}
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}
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prev_ch = ch
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i++
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}
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mut tmp := ""
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if last_zero_start > 0 {
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if last_zero_start == dot_pos+1 {
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tmp = s[..dot_pos] + s[i..]
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}else {
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tmp = s[..last_zero_start] + s[i..]
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}
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} else {
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tmp = s
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}
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if unsafe {tmp.str[tmp.len-1]} == `.` {
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return tmp[..tmp.len-1]
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}
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return tmp
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}
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/*
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Main functions
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*/
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pub fn v_printf(str string, pt ... voidptr) {
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print(v_sprintf(str, pt))
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}
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pub fn v_sprintf(str string, pt ... voidptr) string{
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mut res := strings.new_builder(pt.len * 16)
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mut i := 0 // main strign index
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mut p_index := 0 // parameter index
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mut sign := false // sign flag
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mut allign := Align_text.right
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mut len0 := -1 // forced length, if -1 free length
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mut len1 := -1 // decimal part for floats
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def_len1 := 6 // default value for len1
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mut pad_ch := byte(` `) // pad char
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mut th_separator := false // thousands separator flag
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// prefix chars for Length field
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mut ch1 := `0` // +1 char if present else `0`
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mut ch2 := `0` // +2 char if present else `0`
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mut status := Char_parse_state.norm_char
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for i < str.len {
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if status == .reset_params {
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sign = false
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allign = .right
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len0 = -1
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len1 = -1
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pad_ch = ` `
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th_separator = false
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status = .norm_char
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ch1 = `0`
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ch2 = `0`
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continue
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}
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ch := str[i]
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if ch != `%` && status == .norm_char {
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res.write_b(ch)
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i++
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continue
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}
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if ch == `%` && status == .norm_char {
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status = .field_char
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i++
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continue
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}
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// single char, manage it here
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if ch == `c` && status == .field_char {
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v_sprintf_panic(p_index, pt.len)
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d1 := unsafe {*(&byte(pt[p_index]))}
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res.write_b(d1)
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status = .reset_params
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p_index++
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i++
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continue
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}
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// pointer, manage it here
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if ch == `p` && status == .field_char {
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v_sprintf_panic(p_index, pt.len)
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res.write("0x")
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res.write(ptr_str(unsafe {pt[p_index]}))
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status = .reset_params
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p_index++
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i++
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continue
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}
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if status == .field_char {
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mut fc_ch1 := `0`
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mut fc_ch2 := `0`
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if (i + 1) < str.len {
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fc_ch1 = str[i+1]
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if (i + 2) < str.len {
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fc_ch2 = str[i+2]
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}
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}
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if ch == `+` {
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sign = true
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i++
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continue
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} else if ch == `-` {
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allign = .left
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i++
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continue
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} else if ch in [`0`,` `] {
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if allign == .right {
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pad_ch = ch
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}
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i++
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continue
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} else if ch == `'` {
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th_separator = true
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i++
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continue
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} else if ch == `.` && fc_ch1 >= `1` && fc_ch1 <= `9` {
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status = .check_float
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i++
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continue
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}
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// manage "%.*s" precision field
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else if ch == `.` && fc_ch1 == `*` && fc_ch2 == `s` {
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v_sprintf_panic(p_index, pt.len)
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len := unsafe {*(&int(pt[p_index]))}
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p_index++
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v_sprintf_panic(p_index, pt.len)
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mut s := unsafe {*(&string(pt[p_index]))}
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s = s[..len]
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p_index++
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res.write(s)
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status = .reset_params
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i += 3
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continue
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}
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status = .len_set_start
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continue
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}
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if status == .len_set_start {
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if ch >= `1` && ch <= `9` {
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len0 = int(ch - `0`)
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status = .len_set_in
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i++
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continue
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}
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if ch == `.` {
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status = .check_float
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i++
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continue
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}
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status = .check_type
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continue
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}
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if status == .len_set_in {
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if ch >= `0` && ch <= `9` {
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len0 *= 10
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len0 += int(ch - `0`)
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i++
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continue
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}
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if ch == `.` {
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status = .check_float
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i++
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continue
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}
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status = .check_type
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continue
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}
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if status == .check_float {
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if ch >= `0` && ch <= `9` {
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len1 = int(ch - `0`)
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status = .check_float_in
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i++
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continue
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}
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status = .check_type
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continue
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}
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if status == .check_float_in {
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if ch >= `0` && ch <= `9` {
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len1 *= 10
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len1 += int(ch - `0`)
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i++
|
|
continue
|
|
}
|
|
status = .check_type
|
|
continue
|
|
}
|
|
|
|
if status == .check_type {
|
|
|
|
if ch == `l` {
|
|
if ch1 == `0` {
|
|
ch1 = `l`
|
|
i++
|
|
continue
|
|
} else {
|
|
ch2 = `l`
|
|
i++
|
|
continue
|
|
}
|
|
}
|
|
else if ch == `h` {
|
|
if ch1 == `0` {
|
|
ch1 = `h`
|
|
i++
|
|
continue
|
|
} else {
|
|
ch2 = `h`
|
|
i++
|
|
continue
|
|
}
|
|
}
|
|
|
|
// signed integer
|
|
else if ch in [`d`,`i`] {
|
|
mut d1 := u64(0)
|
|
mut positive := true
|
|
|
|
//println("$ch1 $ch2")
|
|
match ch1 {
|
|
// h for 16 bit int
|
|
// hh fot 8 bit int
|
|
`h` {
|
|
if ch2 == `h` {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&i8(pt[p_index]))}
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u64(x) } else { u64(-x) }
|
|
} else {
|
|
x := unsafe {*(&i16(pt[p_index]))}
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u64(x) } else { u64(-x) }
|
|
}
|
|
}
|
|
// l i64
|
|
// ll i64 for now
|
|
`l` {
|
|
// placeholder for future 128bit integer code
|
|
/*
|
|
if ch2 == `l` {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := *(&i128(pt[p_index]))
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u128(x) } else { u128(-x) }
|
|
} else {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := *(&i64(pt[p_index]))
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u64(x) } else { u64(-x) }
|
|
}
|
|
*/
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&i64(pt[p_index]))}
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u64(x) } else { u64(-x) }
|
|
}
|
|
// default int
|
|
else {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&int(pt[p_index]))}
|
|
positive = if x >= 0 { true } else { false }
|
|
d1 = if positive { u64(x) } else { u64(-x) }
|
|
}
|
|
|
|
}
|
|
res.write(format_dec(d1,{pad_ch: pad_ch, len0: len0, len1: 0, positive: positive, sign_flag: sign, allign: allign}))
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
ch1 = `0`
|
|
ch2 = `0`
|
|
continue
|
|
}
|
|
|
|
// unsigned integer
|
|
else if ch == `u` {
|
|
mut d1 := u64(0)
|
|
positive := true
|
|
v_sprintf_panic(p_index, pt.len)
|
|
match ch1 {
|
|
// h for 16 bit unsigned int
|
|
// hh fot 8 bit unsigned int
|
|
`h` {
|
|
if ch2 == `h` {
|
|
d1 = u64(unsafe {*(&byte(pt[p_index]))})
|
|
} else {
|
|
d1 = u64(unsafe {*(&u16(pt[p_index]))})
|
|
}
|
|
}
|
|
// l u64
|
|
// ll u64 for now
|
|
`l` {
|
|
// placeholder for future 128bit integer code
|
|
/*
|
|
if ch2 == `l` {
|
|
d1 = u128(*(&u128(pt[p_index])))
|
|
} else {
|
|
d1 = u64(*(&u64(pt[p_index])))
|
|
}
|
|
*/
|
|
d1 = u64(unsafe {*(&u64(pt[p_index]))})
|
|
}
|
|
// default int
|
|
else {
|
|
d1 = u64(unsafe {*(&u32(pt[p_index]))})
|
|
}
|
|
}
|
|
|
|
res.write(format_dec(d1,{pad_ch: pad_ch, len0: len0, len1: 0, positive: positive, sign_flag: sign, allign: allign}))
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
|
|
// hex
|
|
else if ch in [`x`, `X`] {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
mut s := ""
|
|
match ch1 {
|
|
// h for 16 bit int
|
|
// hh fot 8 bit int
|
|
`h` {
|
|
if ch2 == `h` {
|
|
x := unsafe {*(&i8(pt[p_index]))}
|
|
s = x.hex()
|
|
} else {
|
|
x := unsafe {*(&i16(pt[p_index]))}
|
|
s = x.hex()
|
|
}
|
|
}
|
|
// l i64
|
|
// ll i64 for now
|
|
`l` {
|
|
// placeholder for future 128bit integer code
|
|
/*
|
|
if ch2 == `l` {
|
|
x := *(&i128(pt[p_index]))
|
|
s = x.hex()
|
|
} else {
|
|
x := *(&i64(pt[p_index]))
|
|
s = x.hex()
|
|
}
|
|
*/
|
|
x := unsafe {*(&i64(pt[p_index]))}
|
|
s = x.hex()
|
|
}
|
|
else {
|
|
x := unsafe {*(&int(pt[p_index]))}
|
|
s = x.hex()
|
|
}
|
|
}
|
|
|
|
if ch == `X` {
|
|
s = s.to_upper()
|
|
}
|
|
|
|
res.write(format_str(s,{pad_ch: pad_ch, len0: len0, len1: 0, positive: true, sign_flag: false, allign: allign}))
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
|
|
// float and double
|
|
if ch in [`f`, `F`] {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&f64(pt[p_index]))}
|
|
mut positive := x >= f64(0.0)
|
|
len1 = if len1 >= 0 { len1 } else { def_len1 }
|
|
s := format_fl(f64(x), {pad_ch: pad_ch, len0: len0, len1: len1, positive: positive, sign_flag: sign, allign: allign})
|
|
res.write(if ch == `F` {s.to_upper()} else {s})
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
else if ch in [`e`, `E`] {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&f64(pt[p_index]))}
|
|
mut positive := x >= f64(0.0)
|
|
len1 = if len1 >= 0 { len1 } else { def_len1 }
|
|
s := format_es(f64(x), {pad_ch: pad_ch, len0: len0, len1: len1, positive: positive, sign_flag: sign, allign: allign})
|
|
res.write(if ch == `E` {s.to_upper()} else {s})
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
else if ch in [`g`, `G`] {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
x := unsafe {*(&f64(pt[p_index]))}
|
|
mut positive := x >= f64(0.0)
|
|
mut s := ""
|
|
tx := fabs(x)
|
|
if tx < 999_999.0 && tx >= 0.00001 {
|
|
//println("Here g format_fl [$tx]")
|
|
len1 = if len1 >= 0 { len1+1 } else { def_len1 }
|
|
s = format_fl(x, {pad_ch: pad_ch, len0: len0, len1: len1, positive: positive, sign_flag: sign, allign: allign, rm_tail_zero: true})
|
|
} else {
|
|
len1 = if len1 >= 0 { len1+1 } else { def_len1 }
|
|
s = format_es(x, {pad_ch: pad_ch, len0: len0, len1: len1, positive: positive, sign_flag: sign, allign: allign, rm_tail_zero: true})
|
|
}
|
|
res.write(if ch == `G` {s.to_upper()} else {s})
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
|
|
// string
|
|
else if ch == `s` {
|
|
v_sprintf_panic(p_index, pt.len)
|
|
s1 := unsafe{*(&string(pt[p_index]))}
|
|
pad_ch = ` `
|
|
res.write(format_str(s1, {pad_ch: pad_ch, len0: len0, len1: 0, positive: true, sign_flag: false, allign: allign}))
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
continue
|
|
}
|
|
}
|
|
|
|
status = .reset_params
|
|
p_index++
|
|
i++
|
|
}
|
|
|
|
if p_index != pt.len {
|
|
panic('${p_index} % conversion specifiers, but given ${pt.len} args')
|
|
}
|
|
|
|
return res.str()
|
|
}
|
|
|
|
[inline]
|
|
fn v_sprintf_panic( idx, len int) {
|
|
if idx >= len {
|
|
panic('${idx+1} % conversion specifiers, but given only ${len} args')
|
|
}
|
|
}
|
|
|
|
fn fabs(x f64) f64 {
|
|
if x < 0.0 {
|
|
return -x
|
|
}
|
|
return x
|
|
}
|