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#pragma once
#include <limits>
#include <ostream>
namespace nix {
/**
* Options for escaping strings in `escapeString`.
*
* With default optional parameters, the output string will round-trip through
* the Nix evaluator (i.e. you can copy/paste this function's output into the
* REPL and have it evaluate as the string that got passed in).
*
* With non-default optional parameters, the output string will be
* human-readable.
*/
struct EscapeStringOptions
{
/**
* If `maxLength` is decreased, some trailing portion of the string may be
* omitted with a message like `«123 bytes elided»`.
*/
size_t maxLength = std::numeric_limits<size_t>::max();
/**
* If `outputAnsiColors` is set, the string will be colored the color of literals, using
* ANSI escape codes.
*/
bool outputAnsiColors = false;
/**
* If `escapeNonPrinting` is set, non-printing ASCII characters (i.e. with
* byte values less than 0x20) will be printed in `\xhh` format, like
* `\x1d` (other than those that Nix supports, like `\n`, `\r`, `\t`).
* Note that this format is not yet supported by the Lix parser/evaluator!
*
* See: https://git.lix.systems/lix-project/lix/issues/149
*/
bool escapeNonPrinting = false;
};
/**
* Escape a string for output.
*
* With default optional parameters, the output string will round-trip through
* the Nix evaluator (i.e. you can copy/paste this function's output into the
* REPL and have it evaluate as the string that got passed in).
*
* With non-default optional parameters, the output string will be
* human-readable.
*
* See `EscapeStringOptions` for more details on customizing the output.
*/
std::ostream &
escapeString(std::ostream & output, std::string_view s, EscapeStringOptions options = {});
inline std::ostream & escapeString(std::ostream & output, const char * s)
{
return escapeString(output, std::string_view(s));
}
inline std::ostream & escapeString(std::ostream & output, const std::string & s)
{
return escapeString(output, std::string_view(s));
}
/**
* Escape a string for output, writing the escaped result to a new string.
*/
std::string escapeString(std::string_view s, EscapeStringOptions options = {});
inline std::string escapeString(const char * s, EscapeStringOptions options = {})
{
return escapeString(std::string_view(s), options);
}
} // namespace nix
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