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strconv: add a small performance optimisation

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This commit is contained in:
Delyan Angelov 2021-12-03 19:52:14 +02:00
parent 365b46cad3
commit 33163238e7
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GPG key ID: 66886C0F12D595ED
2 changed files with 26 additions and 23 deletions
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33
vlib/builtin/string_interpolation.v
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@ -154,14 +154,14 @@ pub fn get_str_intp_u32_format(fmt_type StrIntpType, in_width int, in_precision
// convert from struct to formated string
[manualfree]
fn (data StrIntpData) get_fmt_format(mut sb strings.Builder) {
fn (data &StrIntpData) process_str_intp_data(mut sb strings.Builder) {
x := data.fmt
typ := StrIntpType(x & 0x1F)
allign := int((x >> 5) & 0x01)
upper_case := if ((x >> 7) & 0x01) > 0 { true } else { false }
upper_case := ((x >> 7) & 0x01) > 0
sign := int((x >> 8) & 0x01)
precision := int((x >> 9) & 0x7F)
tail_zeros := if ((x >> 16) & 0x01) > 0 { true } else { false }
tail_zeros := ((x >> 16) & 0x01) > 0
width := int(i16((x >> 17) & 0x3FF))
mut base := int(x >> 27) & 0xF
fmt_pad_ch := byte((x >> 31) & 0xFF)
@ -187,7 +187,7 @@ fn (data StrIntpData) get_fmt_format(mut sb strings.Builder) {
len0_set := if width > 0 { width } else { -1 }
len1_set := if precision == 0x7F { -1 } else { precision }
sign_set := if sign == 1 { true } else { false }
sign_set := sign == 1
mut bf := strconv.BF_param{
pad_ch: pad_ch // padding char
@ -651,22 +651,19 @@ pub:
}
// interpolation function
[manualfree]
[direct_array_access; manualfree]
pub fn str_intp(data_len int, in_data voidptr) string {
mut res := strings.new_builder(256)
unsafe {
mut i := 0
for i < data_len {
data := &StrIntpData(&byte(in_data) + (int(sizeof(StrIntpData)) * i))
// avoid empty strings
if data.str.len != 0 {
res.write_string(data.str)
}
// skip empty data
if data.fmt != 0 {
data.get_fmt_format(mut &res)
}
i++
input_base := &StrIntpData(in_data)
for i := 0; i < data_len; i++ {
data := unsafe { &(input_base[i]) }
// avoid empty strings
if data.str.len != 0 {
res.write_string(data.str)
}
// skip empty data
if data.fmt != 0 {
data.process_str_intp_data(mut res)
}
}
ret := res.str()