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v/vlib/strconv/vprintf.v

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/*=============================================================================
Copyright (c) 2019-2021 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
enum Char_parse_state {
start
norm_char
field_char
pad_ch
len_set_start
len_set_in
check_type
check_float
check_float_in
reset_params
}
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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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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 string index
mut p_index := 0 // parameter index
mut sign := false // sign flag
mut allign := Align_text.right
mut len0 := -1 // forced length, if -1 free length
mut len1 := -1 // decimal part for floats
def_len1 := 6 // default value for len1
mut pad_ch := byte(` `) // pad char
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// prefix chars for Length field
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mut ch1 := `0` // +1 char if present else `0`
mut ch2 := `0` // +2 char if present else `0`
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mut status := Char_parse_state.norm_char
for i < str.len {
if status == .reset_params {
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sign = false
allign = .right
len0 = -1
len1 = -1
pad_ch = ` `
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status = .norm_char
ch1 = `0`
ch2 = `0`
continue
}
ch := str[i]
if ch != `%` && status == .norm_char {
res.write_b(ch)
i++
continue
}
if ch == `%` && status == .norm_char {
status = .field_char
i++
continue
}
// single char, manage it here
if ch == `c` && status == .field_char {
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)
status = .reset_params
p_index++
i++
continue
}
// pointer, manage it here
if ch == `p` && status == .field_char {
v_sprintf_panic(p_index, pt.len)
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res.write_string('0x')
res.write_string(ptr_str(unsafe { pt[p_index] }))
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status = .reset_params
p_index++
i++
continue
}
if status == .field_char {
mut fc_ch1 := `0`
mut fc_ch2 := `0`
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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}
}
if ch == `+` {
sign = true
i++
continue
} else if ch == `-` {
allign = .left
i++
continue
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} else if ch in [`0`, ` `] {
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if allign == .right {
pad_ch = ch
}
i++
continue
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} else if ch == `\'` {
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i++
continue
} else if ch == `.` && fc_ch1 >= `1` && fc_ch1 <= `9` {
status = .check_float
i++
continue
}
// manage "%.*s" precision field
else if ch == `.` && fc_ch1 == `*` && fc_ch2 == `s` {
v_sprintf_panic(p_index, pt.len)
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len := unsafe { *(&int(pt[p_index])) }
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p_index++
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]
p_index++
res.write_string(s)
status = .reset_params
i += 3
continue
}
status = .len_set_start
continue
}
if status == .len_set_start {
if ch >= `1` && ch <= `9` {
len0 = int(ch - `0`)
status = .len_set_in
i++
continue
}
if ch == `.` {
status = .check_float
i++
continue
}
status = .check_type
continue
}
if status == .len_set_in {
if ch >= `0` && ch <= `9` {
len0 *= 10
len0 += int(ch - `0`)
i++
continue
}
if ch == `.` {
status = .check_float
i++
continue
}
status = .check_type
continue
}
if status == .check_float {
if ch >= `0` && ch <= `9` {
len1 = int(ch - `0`)
status = .check_float_in
i++
continue
}
status = .check_type
continue
}
if status == .check_float_in {
if ch >= `0` && ch <= `9` {
len1 *= 10
len1 += int(ch - `0`)
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
}
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} else if ch == `h` {
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if ch1 == `0` {
ch1 = `h`
i++
continue
} else {
ch2 = `h`
i++
continue
}
}
// signed integer
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else if ch in [`d`, `i`] {
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mut d1 := u64(0)
mut positive := true
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// println("$ch1 $ch2")
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match ch1 {
// h for 16 bit int
// hh fot 8 bit int
`h` {
if ch2 == `h` {
v_sprintf_panic(p_index, pt.len)
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x := unsafe { *(&i8(pt[p_index])) }
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positive = if x >= 0 { true } else { false }
d1 = if positive { u64(x) } else { u64(-x) }
} else {
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x := unsafe { *(&i16(pt[p_index])) }
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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)
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x := unsafe { *(&i64(pt[p_index])) }
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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)
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x := unsafe { *(&int(pt[p_index])) }
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positive = if x >= 0 { true } else { false }
d1 = if positive { u64(x) } else { u64(-x) }
}
}
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res.write_string(format_dec_old(d1,
pad_ch: pad_ch
len0: len0
len1: 0
positive: positive
sign_flag: sign
allign: allign
))
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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` {
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d1 = u64(unsafe { *(&byte(pt[p_index])) })
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} else {
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d1 = u64(unsafe { *(&u16(pt[p_index])) })
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}
}
// 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])))
}
*/
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d1 = u64(unsafe { *(&u64(pt[p_index])) })
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}
// default int
else {
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d1 = u64(unsafe { *(&u32(pt[p_index])) })
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}
}
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res.write_string(format_dec_old(d1,
pad_ch: pad_ch
len0: len0
len1: 0
positive: positive
sign_flag: sign
allign: allign
))
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status = .reset_params
p_index++
i++
continue
}
// hex
else if ch in [`x`, `X`] {
v_sprintf_panic(p_index, pt.len)
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mut s := ''
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match ch1 {
// h for 16 bit int
// hh fot 8 bit int
`h` {
if ch2 == `h` {
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x := unsafe { *(&i8(pt[p_index])) }
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s = x.hex()
} else {
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x := unsafe { *(&i16(pt[p_index])) }
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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()
}
*/
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x := unsafe { *(&i64(pt[p_index])) }
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s = x.hex()
}
else {
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x := unsafe { *(&int(pt[p_index])) }
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s = x.hex()
}
}
if ch == `X` {
s = s.to_upper()
}
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res.write_string(format_str(s,
pad_ch: pad_ch
len0: len0
len1: 0
positive: true
sign_flag: false
allign: allign
))
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status = .reset_params
p_index++
i++
continue
}
// float and double
if ch in [`f`, `F`] {
v_sprintf_panic(p_index, pt.len)
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x := unsafe { *(&f64(pt[p_index])) }
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positive := x >= f64(0.0)
len1 = if len1 >= 0 { len1 } else { def_len1 }
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s := format_fl_old(f64(x),
pad_ch: pad_ch
len0: len0
len1: len1
positive: positive
sign_flag: sign
allign: allign
)
res.write_string(if ch == `F` { s.to_upper() } else { s })
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status = .reset_params
p_index++
i++
continue
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} else if ch in [`e`, `E`] {
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v_sprintf_panic(p_index, pt.len)
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x := unsafe { *(&f64(pt[p_index])) }
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positive := x >= f64(0.0)
len1 = if len1 >= 0 { len1 } else { def_len1 }
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s := format_es_old(f64(x),
pad_ch: pad_ch
len0: len0
len1: len1
positive: positive
sign_flag: sign
allign: allign
)
res.write_string(if ch == `E` { s.to_upper() } else { s })
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status = .reset_params
p_index++
i++
continue
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} else if ch in [`g`, `G`] {
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v_sprintf_panic(p_index, pt.len)
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x := unsafe { *(&f64(pt[p_index])) }
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positive := x >= f64(0.0)
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mut s := ''
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tx := fabs(x)
if tx < 999_999.0 && tx >= 0.00001 {
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// println("Here g format_fl [$tx]")
len1 = if len1 >= 0 { len1 + 1 } else { def_len1 }
s = format_fl_old(x,
pad_ch: pad_ch
len0: len0
len1: len1
positive: positive
sign_flag: sign
allign: allign
rm_tail_zero: true
)
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} else {
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len1 = if len1 >= 0 { len1 + 1 } else { def_len1 }
s = format_es_old(x,
pad_ch: pad_ch
len0: len0
len1: len1
positive: positive
sign_flag: sign
allign: allign
rm_tail_zero: true
)
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}
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res.write_string(if ch == `G` { s.to_upper() } else { s })
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status = .reset_params
p_index++
i++
continue
}
// string
else if ch == `s` {
v_sprintf_panic(p_index, pt.len)
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s1 := unsafe { *(&string(pt[p_index])) }
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pad_ch = ` `
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res.write_string(format_str(s1,
pad_ch: pad_ch
len0: len0
len1: 0
positive: true
sign_flag: false
allign: allign
))
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status = .reset_params
p_index++
i++
continue
}
}
status = .reset_params
p_index++
i++
}
if p_index != pt.len {
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panic('$p_index % conversion specifiers, but given $pt.len args')
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}
return res.str()
}
[inline]
fn v_sprintf_panic(idx int, len int) {
if idx >= len {
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panic('${idx + 1} % conversion specifiers, but given only $len args')
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}
}
fn fabs(x f64) f64 {
if x < 0.0 {
return -x
}
return x
}
// strings.Builder version of format_fl
[manualfree]
pub fn format_fl_old(f f64, p BF_param) string {
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unsafe {
mut s := ''
// mut fs := "1.2343"
mut fs := f64_to_str_lnd1(if f >= 0.0 { f } else { -f }, p.len1)
// println("Dario")
// println(fs)
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// error!!
if fs[0] == `[` {
s.free()
return fs
}
if p.rm_tail_zero {
tmp := fs
fs = remove_tail_zeros_old(fs)
tmp.free()
}
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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
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
res.write_b(`+`)
sign_len_diff = -1
}
} else {
res.write_b(`-`)
sign_len_diff = -1
}
tmp := s
s = fs.clone()
tmp.free()
} else {
if p.positive {
if p.sign_flag {
tmp := s
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s = '+' + fs
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tmp.free()
} else {
tmp := s
s = fs.clone()
tmp.free()
}
} else {
tmp := s
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s = '-' + fs
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tmp.free()
}
}
dif := p.len0 - s.len + sign_len_diff
if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
res.write_string(s)
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
s.free()
fs.free()
tmp_res := res.str()
res.free()
return tmp_res
}
}
[manualfree]
pub fn format_es_old(f f64, p BF_param) string {
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unsafe {
mut s := ''
mut fs := f64_to_str_pad(if f > 0 { f } else { -f }, p.len1)
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if p.rm_tail_zero {
fs = remove_tail_zeros_old(fs)
}
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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
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
res.write_b(`+`)
sign_len_diff = -1
}
} else {
res.write_b(`-`)
sign_len_diff = -1
}
tmp := s
s = fs.clone()
tmp.free()
} else {
if p.positive {
if p.sign_flag {
tmp := s
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s = '+' + fs
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tmp.free()
} else {
tmp := s
s = fs.clone()
tmp.free()
}
} else {
tmp := s
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s = '-' + fs
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tmp.free()
}
}
dif := p.len0 - s.len + sign_len_diff
if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
res.write_string(s)
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
s.free()
fs.free()
tmp_res := res.str()
res.free()
return tmp_res
}
}
pub fn remove_tail_zeros_old(s string) string {
mut i := 0
mut last_zero_start := -1
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mut dot_pos := -1
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mut in_decimal := false
mut prev_ch := byte(0)
for i < s.len {
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ch := unsafe { s.str[i] }
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if ch == `.` {
in_decimal = true
dot_pos = i
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} else if in_decimal {
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if ch == `0` && prev_ch != `0` {
last_zero_start = i
} else if ch >= `1` && ch <= `9` {
last_zero_start = -1
} else if ch == `e` {
break
}
}
prev_ch = ch
i++
}
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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..]
}
} else {
tmp = s
}
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if unsafe { tmp.str[tmp.len - 1] } == `.` {
return tmp[..tmp.len - 1]
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}
return tmp
}
// max int64 9223372036854775807
pub fn format_dec_old(d u64, p BF_param) string {
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mut s := ''
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mut res := strings.new_builder(20)
mut sign_len_diff := 0
if p.pad_ch == `0` {
if p.positive {
if p.sign_flag {
res.write_b(`+`)
sign_len_diff = -1
}
} else {
res.write_b(`-`)
sign_len_diff = -1
}
s = d.str()
} else {
if p.positive {
if p.sign_flag {
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s = '+' + d.str()
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} else {
s = d.str()
}
} else {
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s = '-' + d.str()
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}
}
dif := p.len0 - s.len + sign_len_diff
if p.allign == .right {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
res.write_string(s)
if p.allign == .left {
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for i1 := 0; i1 < dif; i1++ {
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res.write_b(p.pad_ch)
}
}
return res.str()
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}