123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
#include "names.hh"
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#include "util.hh"
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#include <regex>
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namespace nix {
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struct Regex
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{
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std::regex regex;
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};
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DrvName::DrvName()
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{
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name = "";
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}
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/* Parse a derivation name. The `name' part of a derivation name is
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everything up to but not including the first dash *not* followed by
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a letter. The `version' part is the rest (excluding the separating
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dash). E.g., `apache-httpd-2.0.48' is parsed to (`apache-httpd',
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'2.0.48'). */
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DrvName::DrvName(std::string_view s) : hits(0)
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{
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name = fullName = std::string(s);
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for (unsigned int i = 0; i < s.size(); ++i) {
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/* !!! isalpha/isdigit are affected by the locale. */
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if (s[i] == '-' && i + 1 < s.size() && !isalpha(s[i + 1])) {
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name = s.substr(0, i);
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version = s.substr(i + 1);
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break;
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}
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}
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}
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DrvName::~DrvName()
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{ }
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bool DrvName::matches(const DrvName & n)
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{
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if (name != "*") {
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if (!regex) {
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regex = std::make_unique<Regex>();
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regex->regex = std::regex(name, std::regex::extended);
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}
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if (!std::regex_match(n.name, regex->regex)) return false;
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}
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if (version != "" && version != n.version) return false;
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return true;
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}
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std::string_view nextComponent(std::string_view::const_iterator & p,
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const std::string_view::const_iterator end)
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{
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/* Skip any dots and dashes (component separators). */
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while (p != end && (*p == '.' || *p == '-')) ++p;
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if (p == end) return "";
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/* If the first character is a digit, consume the longest sequence
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of digits. Otherwise, consume the longest sequence of
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non-digit, non-separator characters. */
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auto s = p;
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if (isdigit(*p))
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while (p != end && isdigit(*p)) p++;
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else
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while (p != end && (!isdigit(*p) && *p != '.' && *p != '-'))
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p++;
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return {s, size_t(p - s)};
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}
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static bool componentsLT(const std::string_view c1, const std::string_view c2)
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{
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auto n1 = string2Int<int>(c1);
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auto n2 = string2Int<int>(c2);
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if (n1 && n2) return *n1 < *n2;
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else if (c1 == "" && n2) return true;
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else if (c1 == "pre" && c2 != "pre") return true;
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else if (c2 == "pre") return false;
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/* Assume that `2.3a' < `2.3.1'. */
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else if (n2) return true;
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else if (n1) return false;
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else return c1 < c2;
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}
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int compareVersions(const std::string_view v1, const std::string_view v2)
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{
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auto p1 = v1.begin();
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auto p2 = v2.begin();
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while (p1 != v1.end() || p2 != v2.end()) {
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auto c1 = nextComponent(p1, v1.end());
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auto c2 = nextComponent(p2, v2.end());
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if (componentsLT(c1, c2)) return -1;
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else if (componentsLT(c2, c1)) return 1;
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}
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return 0;
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}
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DrvNames drvNamesFromArgs(const Strings & opArgs)
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{
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DrvNames result;
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for (auto & i : opArgs)
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result.emplace_back(i);
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return result;
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}
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}
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