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

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

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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)

bool	nix::isReservedKeyword (const std::string_view str)

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

◆ isReservedKeyword()

bool nix::isReservedKeyword ( const std::string_view str )

Returns ‘true’ is a string is a reserved keyword which requires quotation when printing attribute set field names.

◆ 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 )

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.