///////////////////////////////////////////////////////////////////////
#region IPackage Members
public override ReturnCode Select(
PackagePreference preference,
ref Version version,
ref Result error
)
{
if (preference == PackagePreference.Default)
{
string name = this.Name;
VersionStringDictionary ifNeeded = this.IfNeeded;
if (ifNeeded != null)
{
//
// NOTE: *HACK* For now, always select the latest version
// from the list of candidate versions.
//
Version latest = null;
foreach (Version candidate in ifNeeded.Keys)
{
if (PackageOps.VersionCompare(candidate, latest) > 0)
{
latest = candidate;
}
}
//
// NOTE: Were we able to find the latest (i.e. any)
// version?
//
if (latest != null)
{
version = latest;
return(ReturnCode.Ok);
}
else
{
error = String.Format(
"can't find package \"{0}\"",
FormatOps.PackageName(name, null));
}
}
else
{
error = String.Format(
"package \"{0}\" ifneeded scripts not available",
name);
}
}
else
{
error = String.Format(
"unsupported package preference \"{0}\"",
preference);
}
return(ReturnCode.Error);
}
private Version loading; // which version are we actively loading?
///////////////////////////////////////////////////////////////////////
public override ReturnCode Load(
Interpreter interpreter,
Version version,
ref Result result
)
{
if (interpreter != null)
{
if (version != null)
{
string name = this.Name;
VersionStringDictionary ifNeeded = this.IfNeeded;
if (ifNeeded != null)
{
string text;
if (ifNeeded.TryGetValue(version, out text))
{
if (!FlagOps.HasFlags(Flags, PackageFlags.Loading, true))
{
Flags |= PackageFlags.Loading;
loading = version;
try
{
return(interpreter.EvaluateGlobalScript(
text, ref result));
}
catch (Exception e)
{
result = String.Format(
"caught exception while evaluating ifneeded script: {0}",
e);
}
finally
{
loading = null;
Flags &= ~PackageFlags.Loading;
}
}
else
{
result = String.Format(
"circular package dependency: " +
"attempt to provide \"{0}\" requires \"{1}\"",
FormatOps.PackageName(name, version),
FormatOps.PackageName(name, loading));
}
}
else
{
result = String.Format(
"can't find package \"{0}\"",
FormatOps.PackageName(name, version));
}
}
else
{
result = String.Format(
"package \"{0}\" ifneeded scripts not available",
name);
}
}
else
{
result = "invalid package version";
}
}
else
{
result = "invalid interpreter";
}
return(ReturnCode.Error);
}
