/// <summary>
/// Validates the code content of a TextReader and returns the top of the compilation unit syntax tree.
/// If parsing resulted in syntax errors the result will be <c>null</c>.
/// </summary>
/// <param name="stream">The TextReader to parse code from.</param>
/// <returns>Top level node of an LSL syntax tree.</returns>
/// <exception cref="ArgumentNullException"><paramref name="stream"/> is <c>null</c>.</exception>
public ILSLCompilationUnitNode Validate(TextReader stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
HasSyntaxErrors = false;
var inputStream = new AntlrInputStream(stream);
var lexer = new LSLLexer(inputStream);
lexer.RemoveErrorListeners();
var tokenStream = new CommonTokenStream(lexer);
var parser = new LSLParser(tokenStream);
parser.RemoveErrorListeners();
parser.AddErrorListener(_antlrParserErrorHandler);
var parseTree = parser.compilationUnit();
if (parser.NumberOfSyntaxErrors > 0)
{
HasSyntaxErrors = true;
return(null);
}
try
{
var tree = _validatorVisitor.ValidateAndBuildTree(parseTree, lexer.Comments);
if (_validatorVisitor.HasSyntaxWarnings)
{
HasSyntaxWarnings = true;
}
if (tree.HasErrors)
{
HasSyntaxErrors = true;
return(null);
}
return(tree);
}
finally
{
_validatorVisitor.Reset();
}
}
