static CapnpGenJob ToGenJob(ITaskItem item)
{
var job = new CapnpGenJob()
{
CapnpPath = item.GetMetadata("FullPath"),
WorkingDirectory = item.GetMetadata("WorkingDirectory")
};
string importPaths = item.GetMetadata("ImportPaths");
if (!string.IsNullOrWhiteSpace(importPaths))
{
job.AdditionalArguments.AddRange(importPaths.Split(new char[] { ';' },
StringSplitOptions.RemoveEmptyEntries).Select(p => $"-I\"{p.TrimEnd('\\')}\""));
}
string sourcePrefix = item.GetMetadata("SourcePrefix");
if (!string.IsNullOrWhiteSpace(sourcePrefix))
{
job.AdditionalArguments.Add(sourcePrefix);
}
string verbose = item.GetMetadata("Verbose");
if ("true".Equals(verbose, StringComparison.OrdinalIgnoreCase))
{
job.AdditionalArguments.Add("--verbose");
}
return(job);
}
public CsFileGeneratorResult GenerateCodeBehindFile(CapnpGenJob job)
{
string capnpFile = job.CapnpPath;
// Works around a weird capnp.exe behavior: When the input file is empty, it will spit out an exception dump
// instead of a parse error. But the parse error is nice because it contains a generated ID. We want the parse error!
// Workaround: Generate a temporary file that contains a single line break (such that it is not empty...)
try
{
if (File.Exists(capnpFile) && new FileInfo(capnpFile).Length == 0)
{
string tempFile = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName() + ".capnp");
File.WriteAllText(tempFile, Environment.NewLine);
try
{
var jobCopy = new CapnpGenJob()
{
CapnpPath = tempFile,
WorkingDirectory = job.WorkingDirectory
};
jobCopy.AdditionalArguments.AddRange(job.AdditionalArguments);
return(GenerateCodeBehindFile(jobCopy));
}
finally
{
File.Delete(tempFile);
}
}
}
catch
{
}
var args = new List <string>();
args.AddRange(job.AdditionalArguments);
args.Add(capnpFile);
var result = CapnpCompilation.InvokeCapnpAndGenerate(args, job.WorkingDirectory);
if (result.IsSuccess)
{
if (result.GeneratedFiles.Count == 1)
{
return(new CsFileGeneratorResult(
result.GeneratedFiles[0],
capnpFile + ".cs",
result.Messages));
}
else
{
return(new CsFileGeneratorResult(
"Code generation produced more than one file. This is not supported.",
result.Messages));
}
}
else
{
switch (result.ErrorCategory)
{
case CapnpProcessFailure.NotFound:
return(new CsFileGeneratorResult("Unable to find capnp.exe - please install capnproto on your system first."));
case CapnpProcessFailure.BadInput:
return(new CsFileGeneratorResult("Invalid schema", result.Messages));
case CapnpProcessFailure.BadOutput:
return(new CsFileGeneratorResult(
"Internal error: capnp.exe produced a binary code generation request which was not understood by the backend",
result.Messages));
default:
throw new NotSupportedException("Invalid error category");
}
}
}
