37 lines
691 B
Go
37 lines
691 B
Go
// Copyright (c) 2019 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 builtin
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struct StringBuilder {
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buf []byte
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len int
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}
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fn new_string_builder(initial_size int) StringBuilder {
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return StringBuilder {
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buf: new_array(0, initial_size, sizeof(byte))
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}
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}
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fn (b mut StringBuilder) write(s string) {
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b.buf._push_many(s.str, s.len)
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b.len += s.len
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}
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fn (b mut StringBuilder) writeln(s string) {
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b.buf._push_many(s.str, s.len)
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b.buf << `\n`
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b.len += s.len + 1
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}
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fn (b StringBuilder) str() string {
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return tos(b.buf.data, b.len)
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}
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fn (b StringBuilder) cut(n int) {
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b.len -= n
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}
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