public override TReturn VisitExpression([NotNull] SQEParser.ExpressionContext context)
{
generator.Initialize();
var mex = context.mainExpr();
TReturn mainExpression = mex != null?Visit(mex) : null;
return(generator.VisitMainExp(mainExpression));
}
public static TResult GenerateCommand <TReturn, TResult>(IQueryGenerator <TReturn, TResult> qg, string input) where TReturn : class
{
SQEParser.ExpressionContext expressionContext = ProcessInput(input);
var visitor = new AbstractTreeVisitor <TReturn, TResult>(qg);
visitor.Visit(expressionContext);
return(qg.GetResult());
}
private static SQEParser.ExpressionContext ProcessInput(string input)
{
AntlrInputStream inputStream = new AntlrInputStream(input);
var lexer = new SQELexer(inputStream);
CommonTokenStream commonTokenStream = new CommonTokenStream(lexer);
var parser = new SQEParser(commonTokenStream);
parser.RemoveErrorListeners();
parser.AddErrorListener(new PrimitiveErrorListener());
SQEParser.ExpressionContext expressionContext = parser.expression();
return(expressionContext);
}
/// <summary>
/// Visit a parse tree produced by <see cref="SQEParser.expression"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitExpression([NotNull] SQEParser.ExpressionContext context)
{
return(VisitChildren(context));
}