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![Andreas Kling](/assets/img/avatar_default.png)
Also use strlen() instead of manually walking the string. This allows GCC to optimize away the strlen() entirely for string literals. :^)
146 lines
5.1 KiB
C++
146 lines
5.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Vector.h>
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namespace AK {
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class ByteBuffer;
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class String;
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class StringImpl;
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class StringView {
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public:
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StringView() {}
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StringView(const char* characters, size_t length)
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: m_characters(characters)
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, m_length(length)
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{
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}
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StringView(const unsigned char* characters, size_t length)
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: m_characters((const char*)characters)
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, m_length(length)
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{
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}
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[[gnu::always_inline]] inline StringView(const char* cstring)
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: m_characters(cstring)
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, m_length(cstring ? strlen(cstring) : 0)
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{
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}
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StringView(const ByteBuffer&);
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StringView(const String&);
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bool is_null() const { return !m_characters; }
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bool is_empty() const { return m_length == 0; }
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const char* characters_without_null_termination() const { return m_characters; }
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size_t length() const { return m_length; }
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char operator[](size_t index) const { return m_characters[index]; }
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unsigned hash() const;
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bool starts_with(const StringView&) const;
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bool ends_with(const StringView&) const;
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StringView substring_view(size_t start, size_t length) const;
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Vector<StringView> split_view(char, bool keep_empty = false) const;
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// Create a Vector of StringViews split by line endings. As of CommonMark
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// 0.29, the spec defines a line ending as "a newline (U+000A), a carriage
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// return (U+000D) not followed by a newline, or a carriage return and a
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// following newline.".
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Vector<StringView> lines(bool consider_cr = true) const;
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// FIXME: These should be shared between String and StringView somehow!
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unsigned to_uint(bool& ok) const;
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int to_int(bool& ok) const;
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// Create a new substring view of this string view, starting either at the beginning of
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// the given substring view, or after its end, and continuing until the end of this string
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// view (that is, for the remaining part of its length). For example,
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//
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// StringView str { "foobar" };
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// StringView substr = str.substring_view(1, 2); // "oo"
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// StringView substr_from = str.substring_view_starting_from_substring(subst); // "oobar"
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// StringView substr_after = str.substring_view_starting_after_substring(subst); // "bar"
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//
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// Note that this only works if the string view passed as an argument is indeed a substring
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// view of this string view, such as one created by substring_view() and split_view(). It
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// does not work for arbitrary strings; for example declaring substr in the example above as
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//
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// StringView substr { "oo" };
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//
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// would not work.
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StringView substring_view_starting_from_substring(const StringView& substring) const;
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StringView substring_view_starting_after_substring(const StringView& substring) const;
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bool operator==(const char* cstring) const
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{
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if (is_null())
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return !cstring;
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if (!cstring)
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return false;
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size_t other_length = strlen(cstring);
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if (m_length != other_length)
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return false;
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return !memcmp(m_characters, cstring, m_length);
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}
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bool operator!=(const char* cstring) const
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{
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return !(*this == cstring);
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}
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bool operator==(const String&) const;
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bool operator==(const StringView& other) const
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{
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if (is_null())
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return other.is_null();
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if (other.is_null())
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return false;
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if (length() != other.length())
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return false;
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return !memcmp(m_characters, other.m_characters, m_length);
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}
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bool operator!=(const StringView& other) const
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{
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return !(*this == other);
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}
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private:
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friend class String;
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const StringImpl* m_impl { nullptr };
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const char* m_characters { nullptr };
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size_t m_length { 0 };
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};
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}
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using AK::StringView;
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