public static AtawExpressionParser ParseExpression(string expression, char open = char.MinValue, char close = char.MinValue)
{
if (close == char.MinValue)
{
close = open;
}
if (open == char.MinValue)
{
open = '{';
close = '}';
}
AtawExpressionParser parser = new AtawExpressionParser(open, close);
parser.ParseExpr(expression);
return(parser);
}
public static string Execute(string expressionString, char open = char.MinValue, char close = char.MinValue, object input = null)
{
var parser = AtawExpressionParser.ParseExpression(expressionString, open, close);
if (!parser.Parameters.Any())
{
return(parser.FormatString);
}
var count = 0;
var sb = new StringBuilder();
var index = 0;
parser.Parameters.ToList().ForEach(a =>
{
var temp = a.ParameterName.Split(new[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
if (temp.Length > 1)
{
//带参的表达式
var item = temp[0].CodePlugIn <IParamExpression>();
a.Value = item.Execute(temp[1], input);
}
else
{
//无参表达式
var item = a.ParameterName.CodePlugIn <IExpression>();
a.Value = item.Execute();
}
});
parser.Parameters.ToList().ForEach(parameter =>
{
sb.Append(parser.FormatString.Substring(index, parameter.StartIndex - index));
sb.Append(parameter.Value ?? string.Empty);
index = parameter.StartIndex + parameter.Count;
});
if (parser.FormatString.Length > index)
{
sb.Append(parser.FormatString.Substring(index));
}
return(sb.ToString());
}
