lix/src/libstore/names.hh

#pragma once
///@file

#include <memory>

#include "types.hh"

namespace nix {

struct Regex;

struct DrvName
{
    std::string fullName;
    std::string name;
    std::string version;
    unsigned int hits;

    DrvName();
    DrvName(std::string_view s);
    ~DrvName();

    bool matches(const DrvName & n);

private:
    std::unique_ptr<Regex> regex;
};

typedef std::list<DrvName> DrvNames;

std::string_view nextComponent(std::string_view::const_iterator & p,
    const std::string_view::const_iterator end);
std::strong_ordering compareVersions(const std::string_view v1, const std::string_view v2);
DrvNames drvNamesFromArgs(const Strings & opArgs);

}
Use "#pragma once" to prevent repeated header file inclusion 2012-07-18 18:59:03 +00:00			`#pragma once`
Ensure all headers have `#pragma once` and are in API docs `///@file` makes them show up in the internal API dos. A tiny few were missing `#pragma once`. 2023-04-01 03:18:41 +00:00			`///@file`
* Refactoring. 2004-02-06 14:49:41 +00:00
Don't recompile the same regex over and over 2014-10-03 19:29:20 +00:00			`#include <memory>`

* Use a proper namespace. * Optimise header file usage a bit. * Compile the parser as C++. 2006-09-04 21:06:23 +00:00			`#include "types.hh"`
* Refactoring. 2004-02-06 14:49:41 +00:00
* Use a proper namespace. * Optimise header file usage a bit. * Compile the parser as C++. 2006-09-04 21:06:23 +00:00			`namespace nix {`
* Refactoring. 2004-02-06 14:49:41 +00:00
Don't include <regex> in header files This reduces compilation time by ~15 seconds (CPU time). Issue #4045. 2020-09-21 16:22:45 +00:00			`struct Regex;`

* Refactoring. 2004-02-06 14:49:41 +00:00			`struct DrvName`
			`{`
Remove std::string alias 2022-02-21 15:37:25 +00:00			`std::string fullName;`
			`std::string name;`
			`std::string version;`
* Refactoring. 2004-02-06 14:49:41 +00:00			`unsigned int hits;`

* In `--upgrade': added flags `--lt', `--leq', `--always' to specify whether we want to upgrade if the current version is less than the available version (default), when it is less or equal, or always. * Added a flag `--dry-run' to show what would happen in `--install', `--uninstall', and `--upgrade', without actually performing the operation. 2004-02-09 11:59:39 +00:00			`DrvName();`
Make the Store API more type-safe Most functions now take a StorePath argument rather than a Path (which is just an alias for std::string). The StorePath constructor ensures that the path is syntactically correct (i.e. it looks like <store-dir>/<base32-hash>-<name>). Similarly, functions like buildPaths() now take a StorePathWithOutputs, rather than abusing Path by adding a '!<outputs>' suffix. Note that the StorePath type is implemented in Rust. This involves some hackery to allow Rust values to be used directly in C++, via a helper type whose destructor calls the Rust type's drop() function. The main issue is the dynamic nature of C++ move semantics: after we have moved a Rust value, we should not call the drop function on the original value. So when we move a value, we set the original value to bitwise zero, and the destructor only calls drop() if the value is not bitwise zero. This should be sufficient for most types. Also lots of minor cleanups to the C++ API to make it more modern (e.g. using std::optional and std::string_view in some places). 2019-12-05 18:11:09 +00:00			`DrvName(std::string_view s);`
Don't include <regex> in header files This reduces compilation time by ~15 seconds (CPU time). Issue #4045. 2020-09-21 16:22:45 +00:00			`~DrvName();`

Offer suggestions for nix-env -i Closes https://github.com/NixOS/nix/issues/972 2021-11-18 13:32:52 +00:00			`bool matches(const DrvName & n);`
Don't recompile the same regex over and over 2014-10-03 19:29:20 +00:00
			`private:`
Don't include <regex> in header files This reduces compilation time by ~15 seconds (CPU time). Issue #4045. 2020-09-21 16:22:45 +00:00			`std::unique_ptr<Regex> regex;`
* Refactoring. 2004-02-06 14:49:41 +00:00			`};`

Remove std::list alias 2022-02-21 15:25:12 +00:00			`typedef std::list<DrvName> DrvNames;`
* Refactoring. 2004-02-06 14:49:41 +00:00
return string_views from forceString* once a string has been forced we already have dynamic storage allocated for it, so we can easily reuse that storage instead of copying. 2022-01-21 13:44:00 +00:00			`std::string_view nextComponent(std::string_view::const_iterator & p,`
			`const std::string_view::const_iterator end);`
Use std::strong_ordering for version comparison The actual motive here is the avoidance of integer overflow if we were to make these use checked NixInts and retain the subtraction. However, the actual intent of this code is a three-way comparison, which can be done with operator<=>, so we should just do that instead. Change-Id: I7f9a7da1f3176424b528af6d1b4f1591e4ab26bf 2024-07-12 12:56:30 +00:00			`std::strong_ordering compareVersions(const std::string_view v1, const std::string_view v2);`
* Refactoring. 2004-02-06 14:49:41 +00:00			`DrvNames drvNamesFromArgs(const Strings & opArgs);`

* Use a proper namespace. * Optimise header file usage a bit. * Compile the parser as C++. 2006-09-04 21:06:23 +00:00			`}`