122 lines
2.0 KiB
V
122 lines
2.0 KiB
V
// Copyright (c) 2019-2022 Alexander Medvednikov. 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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module strings
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/*
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pub struct Builder {
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mut:
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buf []byte
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pub mut:
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len int
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initial_size int = 1
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}*/
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pub type Builder = []byte
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pub fn new_builder(initial_size int) Builder {
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return []byte{cap: initial_size}
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}
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pub fn (mut b Builder) write_b(data byte) {
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b << data
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}
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pub fn (mut b Builder) write(data []byte) ?int {
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if data.len == 0 {
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return 0
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}
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b << data
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return data.len
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}
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pub fn (b &Builder) byte_at(n int) byte {
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unsafe {
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return b[n]
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}
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}
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pub fn (mut b Builder) write_string(s string) {
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if s.len == 0 {
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return
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}
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for c in s {
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b << c
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}
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}
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pub fn (mut b Builder) writeln(s string) {
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if s.len > 0 {
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b.write_string(s)
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}
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b << 10
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}
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pub fn (mut b Builder) str() string {
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s := ''
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#for (const c of b.val.arr.arr)
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#s.str += String.fromCharCode(+c)
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b.trim(0)
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return s
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}
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pub fn (mut b Builder) cut_last(n int) string {
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cut_pos := b.len - n
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x := b[cut_pos..]
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res := x.bytestr()
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b.trim(cut_pos)
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return res
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}
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pub fn (mut b Builder) go_back_to(pos int) {
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b.trim(pos)
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}
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// go_back discards the last `n` bytes from the buffer
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pub fn (mut b Builder) go_back(n int) {
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b.trim(b.len - n)
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}
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// cut_to cuts the string after `pos` and returns it.
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// if `pos` is superior to builder length, returns an empty string
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// and cancel further operations
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pub fn (mut b Builder) cut_to(pos int) string {
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if pos > b.len {
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return ''
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}
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return b.cut_last(b.len - pos)
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}
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pub fn (mut b Builder) write_runes(runes []rune) {
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for r in runes {
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res := r.str()
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#res.str = String.fromCharCode(r.val)
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b << res.bytes()
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}
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}
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// after(6) returns 'world'
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// buf == 'hello world'
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pub fn (mut b Builder) after(n int) string {
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if n >= b.len {
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return ''
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}
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x := b.slice(n, b.len)
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return x.bytestr()
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}
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// last_n(5) returns 'world'
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// buf == 'hello world'
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pub fn (b &Builder) last_n(n int) string {
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if n >= b.len {
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return ''
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}
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x := b.slice(b.len - n, b.len)
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return x.bytestr()
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}
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