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v/vlib/strings/builder.js.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module strings
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pub struct Builder {
mut:
buf []byte
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pub mut:
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len int
initial_size int = 1
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}
pub fn new_builder(initial_size int) Builder {
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return Builder{[]byte{cap: initial_size}, 0, initial_size}
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}
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pub fn (mut b Builder) write_b(data byte) {
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b.buf << data
}
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pub fn (mut b Builder) write(data []byte) ?int {
if data.len == 0 {
return 0
}
b.buf << data
return data.len
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}
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pub fn (b &Builder) byte_at(n int) byte {
return b.buf[n]
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}
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pub fn (mut b Builder) write_string(s string) {
if s.len == 0 {
return
}
for c in s {
b.buf << c
}
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}
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pub fn (mut b Builder) writeln(s string) {
if s.len > 0 {
b.write_string(s)
}
b.buf << 10
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}
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pub fn (mut b Builder) str() string {
b.buf << byte(0)
s := ''
#for (const c of b.val.buf.arr)
#s.str += String.fromCharCode(+c)
return s
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}