public override Expression VisitStringAtom([NotNull] ExpressionAntlrParser.StringAtomContext context)
{
var text = context.GetText();
if (text.StartsWith("'"))
{
return(Expression.ConstantExpression(Regex.Unescape(text.Trim('\''))));
}
else
{
// start with "
return(Expression.ConstantExpression(Regex.Unescape(text.Trim('"'))));
}
}
public override Expression VisitStringAtom([NotNull] ExpressionAntlrParser.StringAtomContext context)
{
var text = context.GetText();
if (text.StartsWith("'") && text.EndsWith("'"))
{
text = text.Substring(1, text.Length - 2).Replace("\\'", "'");
}
else if (text.StartsWith("\"") && text.EndsWith("\""))
{
text = text.Substring(1, text.Length - 2).Replace("\\\"", "\"");
}
else
{
throw new Exception($"Invalid string {text}");
}
return(Expression.ConstantExpression(EvalEscape(text)));
}
/// <summary>
/// Exit a parse tree produced by the <c>stringAtom</c>
/// labeled alternative in <see cref="ExpressionAntlrParser.primaryExpression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStringAtom([NotNull] ExpressionAntlrParser.StringAtomContext context)
{
}
/// <summary>
/// Visit a parse tree produced by the <c>stringAtom</c>
/// labeled alternative in <see cref="ExpressionAntlrParser.primaryExpression"/>.
/// <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 VisitStringAtom([NotNull] ExpressionAntlrParser.StringAtomContext context)
{
return(VisitChildren(context));
}
