public bool CheckDependencies(PythonInstall install, out DistRequirement failed_dependency, Request request)
{
failed_dependency = new DistRequirement();
if (requires_dist.Count == 0)
{
return(true);
}
List <PythonPackage> installed_packages = new List <PythonPackage>(install.FindInstalledPackages(null, null, request));
foreach (var dep in requires_dist)
{
if (dep.marker != null && !dep.marker.Eval(install))
{
continue;
}
bool satisfied_dependency = false;
foreach (var package in installed_packages)
{
if (package.SatisfiesDependency(install, dep, request))
{
satisfied_dependency = true;
break;
}
}
if (!satisfied_dependency)
{
failed_dependency = dep;
return(false);
}
}
return(true);
}
public static DistRequirement Parse(string requirement)
{
DistRequirement result = new DistRequirement();
result.raw_string = requirement;
if (requirement.Contains(';'))
{
string[] parts = requirement.Split(new char[] { ';' }, 2);
requirement = parts[0].Trim();
result.marker = EnvironmentMarker.ParseEnvironmentMarker(parts[1].Trim());
}
if (requirement.Contains('('))
{
string[] parts = requirement.TrimEnd(')').Split(new char[] { '(' }, 2);
result.name = parts[0].Trim();
result.has_version_specifier = true;
result.version_specifier = new VersionSpecifier(parts[1]);
}
else
{
result.name = requirement.Trim();
result.has_version_specifier = false;
}
return(result);
}
public static PythonPackage GetPackage(Tuple <string, string> source, string name, string version, Request request)
{
var detailed_info = GetDetailedPackageInfo(source, name, version, request);
PythonPackage package = new PythonPackage(name);
package.version = new VersionIdentifier(version);
package.summary = detailed_info["info"]["summary"].ToString();
package.source = source.Item1;
package.sourceurl = source.Item2;
package.search_key = name;
package.downloads = ParseUrls(detailed_info["urls"]);
JToken requires_dist;
if (((JObject)detailed_info["info"]).TryGetValue("requires_dist", out requires_dist))
{
foreach (var requirement in requires_dist)
{
package.requires_dist.Add(DistRequirement.Parse(requirement.ToString()));
}
}
if (((JObject)detailed_info["info"]).TryGetValue("requires", out requires_dist))
{
foreach (var requirement in requires_dist)
{
package.requires_dist.Add(DistRequirement.Parse(requirement.ToString()));
}
}
return(package);
}
public void ReadMetadata(Stream stream)
{
using (var reader = new StreamReader(stream))
{
string line;
while ((line = reader.ReadLine()) != null)
{
if (line == "")
{
break;
}
if (line.StartsWith(" "))
{
// Line continuation
continue;
}
int delim_index = line.IndexOf(": ");
if (delim_index != -1)
{
string name = line.Substring(0, delim_index);
string value = line.Substring(delim_index + 2);
name = name.ToLowerInvariant();
if (name == "name")
{
this.name = value;
}
else if (name == "version")
{
this.version = new VersionIdentifier(value);
}
else if (name == "summary")
{
this.summary = value;
}
else if (name == "requires-dist")
{
this.requires_dist.Add(DistRequirement.Parse(value));
}
}
}
}
}
public bool SatisfiesDependency(PythonInstall install, DistRequirement dep, Request request)
{
if (dep.marker != null && !dep.marker.Eval(install))
{
// FIXME: handle this, somehow?
return(true);
}
if (!MatchesName(dep.name))
{
return(false);
}
if (dep.has_version_specifier)
{
if (!dep.version_specifier.MatchesVersion(version))
{
return(false);
}
}
return(true);
}
private Dictionary <string, PythonPackage> SimpleResolveDependencies(PythonInstall install, out DistRequirement failed_dependency, Request request)
{
Dictionary <string, PythonPackage> result = new Dictionary <string, PythonPackage>();
Queue <DistRequirement> to_resolve = new Queue <DistRequirement>();
var installed_packages = new Dictionary <string, PythonPackage>();
bool need_recheck = true; // True if we're [up|down]grading a package, and therefore may need to recheck deps
foreach (var package in install.FindInstalledPackages(null, null, request))
{
installed_packages[package.name] = package;
}
while (need_recheck)
{
need_recheck = false;
to_resolve.Clear();
foreach (var dep in requires_dist)
{
request.Debug("Adding dependency {0}", dep.raw_string);
to_resolve.Enqueue(dep);
}
result.Clear();
while (to_resolve.Count != 0)
{
var dep = to_resolve.Dequeue();
PythonPackage package;
request.Debug("Examining dependency {0}", dep.raw_string);
if (dep.marker != null && !dep.marker.Eval(install))
{
request.Debug("Does not apply to current Python environment");
continue;
}
if (result.TryGetValue(NormalizeName(dep.name), out package))
{
if (!package.SatisfiesDependency(install, dep, request))
{
failed_dependency = dep;
return(null);
}
request.Debug("Satisfied by package to install {0} {1}", package.name, package.version.ToString());
}
else
{
if (installed_packages.TryGetValue(NormalizeName(dep.name), out package))
{
if (package.SatisfiesDependency(install, dep, request))
{
request.Debug("Satisfied by installed package {0} {1}", package.name, package.version.ToString());
continue;
}
else
{
request.Debug("Not satisfied by installed package {0} {1}", package.name, package.version.ToString());
need_recheck = true;
}
}
// find newest version of package that satisfies dependency
package = null;
foreach (var candidate_package in PyPI.ExactSearch(dep.name, request))
{
request.Debug("Examining {0} {1}", candidate_package.name, candidate_package.version.ToString());
if (candidate_package.SatisfiesDependency(install, dep, request))
{
package = candidate_package;
break;
}
}
if (package == null)
{
request.Debug("Cannot satisfy dependency");
failed_dependency = dep;
return(null);
}
request.Debug("Selecting {0} {1}", package.name, package.version.ToString());
// need to do another request to find dependencies
if (package.incomplete_metadata)
{
package = PyPI.GetPackage(new Tuple <string, string>(package.source, package.sourceurl),
package.name, package.version.raw_version_string, request);
}
// add its dependencies to queue
foreach (var dep2 in package.requires_dist)
{
request.Debug("Adding dependency {0}", dep2.raw_string);
to_resolve.Enqueue(dep2);
}
result[NormalizeName(package.name)] = package;
}
}
}
failed_dependency = default(DistRequirement);
return(result);
}