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105 lines
2.4 KiB
V
105 lines
2.4 KiB
V
module strconv
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import strings
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/*
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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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// Align_text is used to describe the different ways to align a text - left, right and center
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pub 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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// Float conversion utility
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// rounding value
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const dec_round = [
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f64(0.5),
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0.05,
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0.005,
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0.0005,
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0.00005,
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0.000005,
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0.0000005,
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0.00000005,
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0.000000005,
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0.0000000005,
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0.00000000005,
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0.000000000005,
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0.0000000000005,
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0.00000000000005,
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0.000000000000005,
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0.0000000000000005,
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0.00000000000000005,
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0.000000000000000005,
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0.0000000000000000005,
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0.00000000000000000005,
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0.000000000000000000005,
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0.0000000000000000000005,
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0.00000000000000000000005,
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0.000000000000000000000005,
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0.0000000000000000000000005,
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0.00000000000000000000000005,
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0.000000000000000000000000005,
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0.0000000000000000000000000005,
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0.00000000000000000000000000005,
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0.000000000000000000000000000005,
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0.0000000000000000000000000000005,
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0.00000000000000000000000000000005,
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0.000000000000000000000000000000005,
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0.0000000000000000000000000000000005,
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0.00000000000000000000000000000000005,
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0.000000000000000000000000000000000005,
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]!
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// Single format functions
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// BF_param is used for describing the formatting options for a single interpolated value
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pub struct BF_param {
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pub mut:
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pad_ch u8 = u8(` `) // 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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align 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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// format_str returns the `s` formatted, according to the options set in `p`.
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@[manualfree]
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pub fn format_str(s string, p BF_param) string {
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if p.len0 <= 0 {
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return s.clone()
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}
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dif := p.len0 - utf8_str_visible_length(s)
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if dif <= 0 {
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return s.clone()
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}
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mut res := strings.new_builder(s.len + dif)
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defer {
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unsafe { res.free() }
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}
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if p.align == .right {
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for i1 := 0; i1 < dif; i1++ {
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res.write_u8(p.pad_ch)
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}
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}
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res.write_string(s)
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if p.align == .left {
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for i1 := 0; i1 < dif; i1++ {
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res.write_u8(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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