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AK: Add substring methods to Utf8View
This patch implements a Unicode-safe substring method, which can be used when offset and length should be specified in actual characters instead of bytes. This can be used to mitigate issues where a string is split in the middle of a UTF-8 multi-byte character, which leads to invalid UTF-8. Furthermore, it implements to common shorthands for substring methods which take only an offset and return the substring until the end of the string.
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2 changed files with 27 additions and 2 deletions
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@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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@ -57,9 +58,13 @@ public:
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const unsigned char* bytes() const { return begin_ptr(); }
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size_t byte_length() const { return m_string.length(); }
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size_t byte_offset_of(const Utf8CodepointIterator&) const;
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Utf8View substring_view(size_t byte_offset, size_t byte_length) const;
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bool is_empty() const { return m_string.is_empty(); }
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Utf8View substring_view(size_t byte_offset, size_t byte_length) const;
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Utf8View substring_view(size_t byte_offset) const { return substring_view(byte_offset, byte_length() - byte_offset); }
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Utf8View unicode_substring_view(size_t codepoint_offset, size_t codepoint_length) const;
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Utf8View unicode_substring_view(size_t codepoint_offset) const { return unicode_substring_view(codepoint_offset, length() - codepoint_offset); }
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bool is_empty() const { return m_string.is_empty(); }
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bool starts_with(const Utf8View&) const;
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size_t iterator_offset(const Utf8CodepointIterator& it) const
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