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Add StringView class for non owning string
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@ -83,7 +83,7 @@ void option_from_string(const String& str, Regex& re)
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}
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}
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bool prefix_match(const String& str, const String& prefix)
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bool prefix_match(StringView str, StringView prefix)
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{
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auto it = str.begin();
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for (auto& c : prefix)
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@ -94,7 +94,7 @@ bool prefix_match(const String& str, const String& prefix)
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return true;
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}
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bool subsequence_match(const String& str, const String& subseq)
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bool subsequence_match(StringView str, StringView subseq)
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{
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auto it = str.begin();
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for (auto& c : subseq)
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146
src/string.hh
146
src/string.hh
@ -61,6 +61,114 @@ public:
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}
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};
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class StringView
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{
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public:
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constexpr StringView() : m_data{nullptr}, m_length{0} {}
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constexpr StringView(const char* data, ByteCount length)
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: m_data{data}, m_length{length} {}
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constexpr StringView(const char* data) : m_data{data}, m_length{(int)strlen(data)} {}
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constexpr StringView(const char* begin, const char* end) : m_data{begin}, m_length{(int)(end - begin)} {}
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StringView(const String& str) : m_data{str.data().pointer()}, m_length{str.length()} {}
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bool operator==(StringView other) const;
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bool operator!=(StringView other) const;
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const char* data() const { return m_data; }
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using iterator = const char*;
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using reverse_iterator = std::reverse_iterator<const char*>;
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iterator begin() const { return m_data; }
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iterator end() const { return m_data + (int)m_length; }
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reverse_iterator rbegin() const { return reverse_iterator{m_data + (int)m_length}; }
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reverse_iterator rend() const { return reverse_iterator{m_data}; }
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char front() const { return *m_data; }
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char back() const { return m_data[(int)m_length - 1]; }
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char operator[](ByteCount pos) const { return m_data[(int)pos]; }
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ByteCount length() const { return m_length; }
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CharCount char_length() const { return utf8::distance(begin(), end()); }
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bool empty() { return m_length == 0_byte; }
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ByteCount byte_count_to(CharCount count) const;
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CharCount char_count_to(ByteCount count) const;
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StringView substr(ByteCount from, ByteCount length = INT_MAX) const;
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StringView substr(CharCount from, CharCount length = INT_MAX) const;
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String str() const { return String{begin(), end()}; }
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operator String() const { return str(); } // to remove
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private:
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const char* m_data;
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ByteCount m_length;
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};
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inline bool StringView::operator==(StringView other) const
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{
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return m_length == other.m_length and memcmp(m_data, other.m_data, (int)m_length) == 0;
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}
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inline bool StringView::operator!=(StringView other) const
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{
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return !this->operator==(other);
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}
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inline bool operator==(const char* lhs, StringView rhs)
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{
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return StringView{lhs} == rhs;
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}
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inline bool operator!=(const char* lhs, StringView rhs)
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{
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return StringView{lhs} != rhs;
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}
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inline bool operator==(const std::string& lhs, StringView rhs)
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{
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return StringView{lhs} == rhs;
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}
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inline bool operator!=(const std::string& lhs, StringView rhs)
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{
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return StringView{lhs} != rhs;
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}
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inline ByteCount StringView::byte_count_to(CharCount count) const
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{
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return utf8::advance(begin(), end(), (int)count) - begin();
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}
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inline CharCount StringView::char_count_to(ByteCount count) const
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{
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return utf8::distance(begin(), begin() + (int)count);
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}
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inline StringView StringView::substr(ByteCount from, ByteCount length) const
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{
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return StringView{ m_data + (int)from, std::min(m_length - from, length) };
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}
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inline StringView StringView::substr(CharCount from, CharCount length) const
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{
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auto beg = utf8::advance(begin(), end(), (int)from);
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return StringView{ beg, utf8::advance(beg, end(), length) };
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}
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inline const char* begin(StringView str)
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{
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return str.begin();
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}
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inline const char* end(StringView str)
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{
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return str.end();
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}
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inline String operator+(const char* lhs, const String& rhs)
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{
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return String(lhs) + rhs;
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@ -76,6 +184,40 @@ inline String operator+(const String& lhs, const std::string& rhs)
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return lhs + String(rhs);
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}
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inline String& operator+=(String& lhs, StringView rhs)
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{
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lhs.append(rhs.data(), (size_t)(int)rhs.length());
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return lhs;
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}
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inline String operator+(const char* lhs, StringView rhs)
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{
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String res = lhs;
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res += rhs;
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return res;
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}
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inline String operator+(const String& lhs, StringView rhs)
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{
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String res = lhs;
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res += rhs;
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return res;
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}
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inline String operator+(StringView lhs, const String& rhs)
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{
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String res{lhs.begin(), lhs.end()};
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res.append(rhs);
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return res;
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}
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inline String operator+(StringView lhs, const char* rhs)
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{
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String res{lhs.begin(), lhs.end()};
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res.append(rhs);
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return res;
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}
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inline String operator+(char lhs, const String& rhs)
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{
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return String(lhs) + rhs;
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@ -114,8 +256,8 @@ String to_string(const StronglyTypedNumber<RealType, ValueType>& val)
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return to_string((ValueType)val);
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}
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bool prefix_match(const String& str, const String& prefix);
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bool subsequence_match(const String& str, const String& subseq);
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bool prefix_match(StringView str, StringView prefix);
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bool subsequence_match(StringView str, StringView subseq);
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}
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