escape_newline.hh

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#ifndef ESCAPE_NEWLINE_HH
#define ESCAPE_NEWLINE_HH
 
#include "one_of.hh"
 
#include <string>
#include <string_view>
 
namespace escape_newline {
 
[[nodiscard]] inline std::string encode(std::string_view input)
{
        // TODO use c++23 std::string::resize_and_overwrite()
        std::string result;
        result.reserve(input.size());
        for (char c : input) {
                if (c == one_of('\n', '\\'))  {
                        if (c == '\n') c = 'n';
                        result += '\\';
                }
                result += c;
        }
        return result;
}
 
[[nodiscard]] inline std::string decode(std::string_view input)
{
        // TODO use c++23 std::string::resize_and_overwrite()
        std::string result;
        result.reserve(input.size());
        for (size_t i = 0, end = input.size(); i < end; ++i) {
                char c = input[i];
                if (c == '\\') {
                        if (++i == end) break; // error
                        c = input[i];
                        if (c == 'n') c = '\n';
                }
                result += c;
        }
        return result;
}
 
} // namespace escape_newline
 
#endif