void RaiseError(int characterStartPos, int characterEndPos, string message)
{
string errorFileName = null;
int? line = null;
int? column = null;
if (this.sources != null && this.fileName != null)
{
var sourceFile = SourceFile.FindSource(this.sources, this.fileName);
var content = sourceFile.Content;
errorFileName = fileName;
var startPos = Position.CalculatePosition(sourceFile, characterStartPos);
var endPos = Position.CalculatePosition(sourceFile, characterEndPos);
var lines = Utils.ExtractRelevantSource(content.Split('\n'), startPos, endPos);
message = String.Format("{0}\n{1}\n{2}", message, lines [0], lines [1]);
line = startPos.Line;
column = startPos.Column;
}
throw new ShovelException()
{
ShovelMessage = message,
FileName = errorFileName,
Line = line,
Column = column,
AtEof = line == null
};
}
void ExtendFrame(Types.Environment env, string name, ParseTree nameAst)
{
var topFrame = env.Frame;
var currentStartPos = nameAst.StartPos;
var previousDefinition = topFrame.EntryFor(name);
if (previousDefinition != null)
{
var sourceFile = SourceFile.FindSource(this.sources, previousDefinition.FileName);
var pos = Position.CalculatePosition(sourceFile, previousDefinition.StartPos);
var message = String.Format(
"Variable '{0}' is already defined in this frame in file '{1}', at line {2}, column {3}.",
name, pos.FileName, pos.Line, pos.Column);
this.RaiseError(currentStartPos, nameAst.EndPos, message);
}
else
{
var newVar = new EnvVar()
{
Name = name,
FileName = this.fileName,
Place = topFrame.Vars.Count,
StartPos = currentStartPos
};
topFrame.Vars.Add(newVar);
}
}