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![Andreas Kling](/assets/img/avatar_default.png)
This should make you think twice before trying to use the const char* from a StringView as if it's a null-terminated string.
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
#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, int 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, int 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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StringView(const char* cstring)
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: m_characters(cstring)
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{
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if (cstring) {
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while (*(cstring++))
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++m_length;
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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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int length() const { return m_length; }
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char operator[](int index) const { return m_characters[index]; }
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StringView substring_view(int start, int length) const;
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Vector<StringView> split_view(char) const;
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unsigned to_uint(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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int 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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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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int m_length { 0 };
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};
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}
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using AK::StringView;
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