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https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
strager
d036fdf919
Including <iostream> has two problems: * Compile times are worse because of over-inclusion * Binary sizes are worse when statically linking libstdc++ because iostreams cannot be dead-code-stripped simdjson only needs std::ostream. Include the header declaring only what we need (<ostream>), omitting stuff we don't need (std::cout and its initialization, for example). This commit should not change behavior, but it might break users who assume that including <simdjson/simdjson.h> will make std::cout available (such as many of simdjson's own files).
66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
#ifndef SIMDJSON_INTERNAL_JSONFORMATUTILS_H
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#define SIMDJSON_INTERNAL_JSONFORMATUTILS_H
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#include <iomanip>
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#include <ostream>
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#include <sstream>
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namespace simdjson {
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namespace internal {
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class escape_json_string;
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inline std::ostream& operator<<(std::ostream& out, const escape_json_string &str);
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class escape_json_string {
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public:
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escape_json_string(std::string_view _str) noexcept : str{_str} {}
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operator std::string() const noexcept { std::stringstream s; s << *this; return s.str(); }
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private:
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std::string_view str;
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friend std::ostream& operator<<(std::ostream& out, const escape_json_string &unescaped);
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};
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inline std::ostream& operator<<(std::ostream& out, const escape_json_string &unescaped) {
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for (size_t i=0; i<unescaped.str.length(); i++) {
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switch (unescaped.str[i]) {
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case '\b':
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out << "\\b";
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break;
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case '\f':
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out << "\\f";
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break;
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case '\n':
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out << "\\n";
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break;
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case '\r':
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out << "\\r";
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break;
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case '\"':
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out << "\\\"";
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break;
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case '\t':
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out << "\\t";
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break;
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case '\\':
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out << "\\\\";
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break;
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default:
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if (static_cast<unsigned char>(unescaped.str[i]) <= 0x1F) {
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// TODO can this be done once at the beginning, or will it mess up << char?
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std::ios::fmtflags f(out.flags());
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out << "\\u" << std::hex << std::setw(4) << std::setfill('0') << int(unescaped.str[i]);
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out.flags(f);
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} else {
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out << unescaped.str[i];
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}
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}
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}
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return out;
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}
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} // namespace internal
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} // namespace simdjson
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#endif // SIMDJSON_INTERNAL_JSONFORMATUTILS_H
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