print.hh File Reference

Common printing functions for the Nix language. More...

#include <iostream>
#include "lix/libutil/fmt.hh"
#include "lix/libexpr/print-options.hh"

Go to the source code of this file.

Classes
class	nix::ValuePrinter

Functions
std::ostream &	nix::printLiteralBool (std::ostream &str, bool boolean)
std::ostream &	nix::printAttributeName (std::ostream &str, std::string_view name)
std::ostream &	nix::printIdentifier (std::ostream &str, std::string_view s)
void	nix::printValue (EvalState &state, std::ostream &output, Value &v, PrintOptions options)
std::ostream &	nix::operator<< (std::ostream &output, const ValuePrinter &printer)

Detailed Description

Common printing functions for the Nix language.

While most types come with their own methods for printing, they share some functions that are placed here.

Function Documentation

printAttributeName()

std::ostream & nix::printAttributeName	(	std::ostream &	o,
		std::string_view	s )

Print a string as an attribute name in the Nix expression language syntax.

Prints a quoted string if necessary.

printIdentifier()

std::ostream & nix::printIdentifier	(	std::ostream &	o,
		std::string_view	s )

Returns `true' is a string is a reserved keyword which requires quotation when printing attribute set field names. */ bool isReservedKeyword(const std::string_view str);

/** Print a string as an identifier in the Nix expression language syntax.

FIXME: "identifier" is ambiguous. Identifiers do not have a single textual representation. They can be used in variable references, let bindings, left-hand sides or attribute names in a select expression, or something else entirely, like JSON. Use one of the print* functions instead.

printLiteralBool()

std::ostream & nix::printLiteralBool	(	std::ostream &	o,
		bool	b )

Print true or false.