96 lines
1.7 KiB
V
96 lines
1.7 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
module strings
|
|
|
|
pub struct Builder {
|
|
mut:
|
|
buf []byte
|
|
pub mut:
|
|
len int
|
|
initial_size int = 1
|
|
}
|
|
|
|
pub fn new_builder(initial_size int) Builder {
|
|
return Builder{
|
|
//buf: make(0, initial_size)
|
|
buf: []byte{cap: initial_size}
|
|
initial_size: initial_size
|
|
}
|
|
}
|
|
|
|
pub fn (b mut Builder) write_bytes(bytes byteptr, howmany int) {
|
|
b.buf.push_many(bytes, howmany)
|
|
b.len += howmany
|
|
}
|
|
|
|
pub fn (b mut Builder) write_b(data byte) {
|
|
b.buf << data
|
|
b.len++
|
|
}
|
|
|
|
pub fn (b mut Builder) write(s string) {
|
|
if s == '' {
|
|
return
|
|
}
|
|
b.buf.push_many(s.str, s.len)
|
|
// for c in s {
|
|
// b.buf << c
|
|
// }
|
|
// b.buf << []byte(s) // TODO
|
|
b.len += s.len
|
|
}
|
|
|
|
pub fn (b mut Builder) go_back(n int) {
|
|
b.buf.trim(b.buf.len-n)
|
|
b.len -= n
|
|
}
|
|
|
|
pub fn (b mut Builder) writeln(s string) {
|
|
// for c in s {
|
|
// b.buf << c
|
|
// }
|
|
b.buf.push_many(s.str, s.len)
|
|
// b.buf << []byte(s) // TODO
|
|
b.buf << `\n`
|
|
b.len += s.len + 1
|
|
}
|
|
|
|
// buf == 'hello world'
|
|
// last_n(5) returns 'world'
|
|
pub fn (b &Builder) last_n(n int) string {
|
|
if n > b.len {
|
|
return ''
|
|
}
|
|
buf := b.buf[b.len-n..]
|
|
return string(buf.clone())
|
|
}
|
|
|
|
// buf == 'hello world'
|
|
// after(6) returns 'world'
|
|
pub fn (b &Builder) after(n int) string {
|
|
if n >= b.len {
|
|
return ''
|
|
}
|
|
buf := b.buf[n..]
|
|
mut copy := buf.clone()
|
|
copy << `\0`
|
|
return string(copy)
|
|
}
|
|
|
|
pub fn (b mut Builder) str() string {
|
|
b.buf << `\0`
|
|
return string(b.buf,b.len)
|
|
}
|
|
|
|
pub fn (b mut Builder) free() {
|
|
unsafe{
|
|
free(b.buf.data)
|
|
}
|
|
// QTODO checker bug
|
|
s := b.initial_size
|
|
b.buf = []byte{cap: s}
|
|
b.len = 0
|
|
}
|
|
|