eldritch horrors
feebecd60b
otherwise lix may crash when e.g. nix search receives invalid regex. we now also give better error messages for regex errors during eval. fixes #803 Change-Id: Icc7c578ff488ba520efac5d898572ccf4486e9a8
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
#include <regex>
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#include "lix/libutil/url-name.hh"
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#include "regex.hh"
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namespace nix {
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static std::string const attributeNamePattern("[a-zA-Z0-9_-]+");
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static std::regex const lastAttributeRegex = regex::parse("(?:" + attributeNamePattern + "\\.)*(?!default)(" + attributeNamePattern +")(\\^.*)?");
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static std::string const pathSegmentPattern("[a-zA-Z0-9_-]+");
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static std::regex const lastPathSegmentRegex = regex::parse(".*/(" + pathSegmentPattern +")");
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static std::regex const secondPathSegmentRegex = regex::parse("(?:" + pathSegmentPattern + ")/(" + pathSegmentPattern +")(?:/.*)?");
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static std::regex const gitProviderRegex = regex::parse("github|gitlab|sourcehut");
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static std::regex const gitSchemeRegex = regex::parse("git($|\\+.*)");
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static std::regex const defaultOutputRegex = regex::parse(".*\\.default($|\\^.*)");
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std::optional<std::string> getNameFromURL(ParsedURL const & url)
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{
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std::smatch match;
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/* If there is a dir= argument, use its value */
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if (url.query.count("dir") > 0) {
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return url.query.at("dir");
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}
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/* If the fragment isn't a "default" and contains two attribute elements, use the last one */
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if (std::regex_match(url.fragment, match, lastAttributeRegex)) {
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return match.str(1);
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}
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/* If this is a github/gitlab/sourcehut flake, use the repo name */
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if (
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std::regex_match(url.scheme, gitProviderRegex)
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&& std::regex_match(url.path, match, secondPathSegmentRegex)
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) {
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return match.str(1);
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}
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/* If it is a regular git flake, use the directory name */
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if (
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std::regex_match(url.scheme, gitSchemeRegex)
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&& std::regex_match(url.path, match, lastPathSegmentRegex)
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) {
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return match.str(1);
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}
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/* If everything failed but there is a non-default fragment, use it in full */
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if (!url.fragment.empty() && !std::regex_match(url.fragment, defaultOutputRegex))
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return url.fragment;
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/* If there is no fragment, take the last element of the path */
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if (std::regex_match(url.path, match, lastPathSegmentRegex))
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return match.str(1);
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/* If even that didn't work, the URL does not contain enough info to determine a useful name */
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return {};
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}
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}
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