mirror of
https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
Daniel Lemire
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
#ifndef SIMDJSON_CONSTEVALUTIL_H
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#define SIMDJSON_CONSTEVALUTIL_H
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#include <string>
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#include <string_view>
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#include <array>
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namespace simdjson {
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namespace constevalutil {
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#if SIMDJSON_CONSTEVAL
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constexpr static std::array<uint8_t, 256> json_quotable_character = {
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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constexpr static std::array<std::string_view, 32> control_chars = {
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"\\u0000", "\\u0001", "\\u0002", "\\u0003", "\\u0004", "\\u0005", "\\u0006",
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"\\u0007", "\\b", "\\t", "\\n", "\\u000b", "\\f", "\\r",
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"\\u000e", "\\u000f", "\\u0010", "\\u0011", "\\u0012", "\\u0013", "\\u0014",
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"\\u0015", "\\u0016", "\\u0017", "\\u0018", "\\u0019", "\\u001a", "\\u001b",
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"\\u001c", "\\u001d", "\\u001e", "\\u001f"};
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// unoptimized, meant for compile-time execution
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consteval std::string consteval_to_quoted_escaped(std::string_view input) {
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std::string out = "\"";
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for (char c : input) {
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if (json_quotable_character[uint8_t(c)]) {
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if (c == '"') {
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out.append("\\\"");
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} else if (c == '\\') {
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out.append("\\\\");
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} else {
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std::string_view v = control_chars[uint8_t(c)];
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out.append(v);
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}
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} else {
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out.push_back(c);
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}
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}
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out.push_back('"');
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return out;
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}
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#endif // SIMDJSON_CONSTEVAL
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#if SIMDJSON_SUPPORTS_CONCEPTS
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template <size_t N>
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struct fixed_string {
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constexpr fixed_string(const char (&str)[N]) {
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for (std::size_t i = 0; i < N; ++i) {
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data[i] = str[i];
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}
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}
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char data[N];
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constexpr std::string_view view() const { return {data, N - 1}; }
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constexpr size_t size() const { return N ; }
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constexpr operator std::string_view() const { return view(); }
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constexpr char operator[](std::size_t index) const { return data[index]; }
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constexpr bool operator==(const fixed_string& other) const {
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if (N != other.size()) {
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return false;
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}
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for (std::size_t i = 0; i < N; ++i) {
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if (data[i] != other.data[i]) {
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return false;
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}
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}
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return true;
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}
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};
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template <std::size_t N>
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fixed_string(const char (&)[N]) -> fixed_string<N>;
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template <fixed_string str>
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struct string_constant {
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static constexpr std::string_view value = str.view();
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};
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#endif // SIMDJSON_SUPPORTS_CONCEPTS
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} // namespace constevalutil
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} // namespace simdjson
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#endif // SIMDJSON_CONSTEVALUTIL_H
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