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v/vlib/strings/builder.v
2019-07-03 22:18:46 +02:00

41 lines
719 B
Go

// Copyright (c) 2019 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
struct Builder {
mut:
buf []byte
len int
}
pub fn new_builder(initial_size int) Builder {
return Builder {
buf: _make(0, initial_size, sizeof(byte))
}
}
pub fn (b mut Builder) write(s string) {
b.buf._push_many(s.str, s.len)
b.len += s.len
}
pub fn (b mut Builder) writeln(s string) {
b.buf._push_many(s.str, s.len)
b.buf << `\n`
b.len += s.len + 1
}
pub fn (b Builder) str() string {
return tos(b.buf.data, b.len)
}
pub fn (b Builder) cut(n int) {
b.len -= n
}
pub fn (b mut Builder) free() {
C.free(b.buf.data)
}