static PipelineWorkUnit BuildPipelineWorkUnit(StringSegment segment)
{
var workUnit = new PipelineWorkUnit(segment);
return(workUnit);
}
public static PipelineWorkUnit GetPipeline(
CommandEvaluationContext context,
ArraySegment <StringSegment> segments
)
{
/*
* cmdLine ::= (InputRedirect? (Cmd CmdParamOptions?) OutputRedirect* Pipe?)+
*/
PipelineWorkUnit model = null;
PipelineWorkUnit workUnit = null;
string cmd = null;
int i = 0;
StringSegment nextSegment() => i + 1 < segments.Count ? segments[i + 1] : null;
StringSegment nxtSeg = null;
while (i < segments.Count)
{
var segment = segments[i];
var s = segment.Text;
if (cmd == null)
{
if (IsNotAnOperator(s))
{
cmd = s;
workUnit = BuildPipelineWorkUnit(segment);
workUnit.Command = cmd;
if (model == null)
{
model = workUnit;
}
}
else
{
// unexpected operator
throw new ParseErrorException(
new ParseError($"unexpected operator: {s}", i, segment.X, null));
}
}
else
{
nxtSeg = nextSegment();
if (IsPipeOperator(s))
{
if (nxtSeg == null)
{
// expected pipe something
throw new ParseErrorException(
new ParseError($"unexpected operator: {CommandLineSyntax.Pipeline}", i, segment.X, null));
}
else
{
workUnit.NextUnit = BuildPipelineWorkUnit(nxtSeg);
var previousWorkUnit = workUnit;
workUnit = workUnit.NextUnit;
if (s == CommandLineSyntax.Pipeline)
{
previousWorkUnit.PipelineCondition = PipelineCondition.Always;
}
if (s == ConditionalPipelineFail)
{
previousWorkUnit.PipelineCondition = PipelineCondition.Error;
}
if (s == ConditionalPipelineSuccess)
{
previousWorkUnit.PipelineCondition = PipelineCondition.Success;
}
cmd = nxtSeg.Text;
workUnit.Command = cmd;
if (model == null)
{
model = workUnit;
}
i++;
}
}
else
{
if (IsNotAnOperator(s))
{
workUnit.Segments.Add(segment);
}
else
{
if (IsRedirectInput(s))
{
if (nxtSeg == null)
{
throw new ParseErrorException(
new ParseError($"unexpected operator {s}", i, segment.X, null));
}
if (IsHereScript(s))
{
workUnit.HereScript = nxtSeg;
}
else
{
workUnit.InputRedirectSource = nxtSeg;
}
i++;
}
if (IsRedirectOutput(s))
{
if (nxtSeg == null)
{
throw new ParseErrorException(
new ParseError($"unexpected operator {s}", i, segment.X, null));
}
workUnit.OutputRedirectTarget = nxtSeg;
i++;
}
}
}
}
i++;
}
#if debugParser
context.Out.Echoln(Darkcyan + model);
#endif
return(model);
}