mirror of
https://github.com/matrix-construct/construct
synced 2024-11-18 07:50:57 +01:00
44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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std::string
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ircd::replace(const string_view &s,
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const char &before,
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const string_view &after)
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{
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const uint32_t occurs
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(
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std::count(begin(s), end(s), before)
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);
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const size_t size
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{
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occurs? s.size() + (occurs * after.size()):
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s.size() - occurs
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};
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return string(size, [&s, &before, &after]
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(const mutable_buffer &buf)
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{
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char *p{begin(buf)};
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std::for_each(begin(s), end(s), [&before, &after, &p]
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(const char &c)
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{
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if(c == before)
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{
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memcpy(p, after.data(), after.size());
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p += after.size();
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}
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else *p++ = c;
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});
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return std::distance(begin(buf), p);
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});
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}
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