public static string eval(string expr, Hashtable h)
{
Regex re_sep = new Regex(@"(==|!=|&&|\|\||[./+*\(\)-]| )");
Regex re_int = new Regex(@"^[0-9]+$");
Regex re_var = new Regex(@"^\$?[a-zA-Z_][0-9a-zA-Z_]*$");
Regex re_float = new Regex(@"^\-?\d+\.?\d*$");
eval_list i=new eval_list();
eval_list s=new eval_list();
try {
// Tokenize
string[] tokens=re_sep.Split(expr);
for(int n=0;n<tokens.Length;n++) {
string token=tokens[n];
if(token==".") {
i.enqueue("DOT",token);
} else if(token=="+") {
i.enqueue("PLUS",token);
} else if(token=="-") {
i.enqueue("MINUS",token);
} else if(token=="(") {
i.enqueue("LP",token);
} else if(token==")") {
i.enqueue("RP",token);
} else if(token=="==") {
i.enqueue("EQUAL",token);
} else if(token=="!=") {
i.enqueue("NOT_EQUAL",token);
} else if(token=="and" || token=="&&") {
i.enqueue("AND",token);
} else if(token=="or" || token=="||") {
i.enqueue("OR",token);
} else if(re_int.Match(token).Success) {
i.enqueue("STR",token);
} else if(re_var.Match(token).Success) {
Object o=h[token];
if (o is bool && !(bool)o) o = "";
i.enqueue("STR",(o==null) ? "" : o.ToString() );
} else if(token.StartsWith("\"") || token.StartsWith("'")) {
string term=token.Substring(0,1);
token=token.Substring(1,token.Length-1);
while(!token.EndsWith(term))
token+=tokens[++n];
i.enqueue("STR",token.Substring(0,token.Length-1));
}
}
// print("input: ",tokens);
// print("input: ",i.l);
// print("*************************************");
// Shift Reduce loop
while(i.l.Count>0 || s.l.Count>1) {
//print("input: ",i.l);
//print("stack: ",s.l);
//print();
// REDUCE
if(s[2][0]=="STR" && s[1][0]=="PLUS" && s[0][0]=="STR") {
int r = ToInt(s[2][1]) + ToInt(s[0][1]);
s.replace(3,"STR", r.ToString());
} else if(s[2][0]=="STR" && s[1][0]=="MINUS" && s[0][0]=="STR") {
int r = ToInt(s[2][1]) - ToInt(s[0][1]);
s.replace(3,"STR", r.ToString());
} else if(s[2][0]=="STR" && s[1][0]=="DOT" && s[0][0]=="STR") {
s.replace(3,"STR", s[2][1] + s[0][1]);
} else if(s[2][0]=="STR" && s[1][0]=="EQUAL" && s[0][0]=="STR") {
s.replace(3,"STR", (s[2][1]==s[0][1]) ? "True" : "");
} else if(s[2][0]=="STR" && s[1][0]=="NOT_EQUAL" && s[0][0]=="STR") {
s.replace(3,"STR", (s[2][1]!=s[0][1]) ? "True" : "");
} else if(s[2][0]=="STR" && s[1][0]=="AND" && s[0][0]=="STR") {
s.replace(3,"STR", (s[2][1].Length>0 && s[0][1].Length>0) ? "True" : "");
} else if(s[2][0]=="STR" && s[1][0]=="OR" && s[0][0]=="STR") {
s.replace(3,"STR", (s[2][1].Length>0 || s[0][1].Length>0) ? "True" : "");
} else if(s[2][0]=="LP" && s[1][0]=="STR" && s[0][0]=="RP") {
s.replace(3,"STR", s[1][1] );
// SHIFT
} else {
s.push(i.pop());
}
}
// print("input: ",i.l);
// print("stack: ",s.l);
// print("eval",expr,s[0][1]);
return s[0][1];
} catch {
QU.rwe("Error evaluating : <br/><pre>" + expr);
return "ERROR";
}
}
public static string eval(string expr, Hashtable h)
{
Regex re_sep = new Regex(@"(==|!=|&&|\|\||[./+*\(\)-]| )");
Regex re_int = new Regex(@"^[0-9]+$");
Regex re_var = new Regex(@"^\$?[a-zA-Z_][0-9a-zA-Z_]*$");
Regex re_float = new Regex(@"^\-?\d+\.?\d*$");
eval_list i = new eval_list();
eval_list s = new eval_list();
try {
// Tokenize
string[] tokens = re_sep.Split(expr);
for (int n = 0; n < tokens.Length; n++)
{
string token = tokens[n];
if (token == ".")
{
i.enqueue("DOT", token);
}
else if (token == "+")
{
i.enqueue("PLUS", token);
}
else if (token == "-")
{
i.enqueue("MINUS", token);
}
else if (token == "(")
{
i.enqueue("LP", token);
}
else if (token == ")")
{
i.enqueue("RP", token);
}
else if (token == "==")
{
i.enqueue("EQUAL", token);
}
else if (token == "!=")
{
i.enqueue("NOT_EQUAL", token);
}
else if (token == "and" || token == "&&")
{
i.enqueue("AND", token);
}
else if (token == "or" || token == "||")
{
i.enqueue("OR", token);
}
else if (re_int.Match(token).Success)
{
i.enqueue("STR", token);
}
else if (re_var.Match(token).Success)
{
Object o = h[token];
if (o is bool && !(bool)o)
{
o = "";
}
i.enqueue("STR", (o == null) ? "" : o.ToString());
}
else if (token.StartsWith("\"") || token.StartsWith("'"))
{
string term = token.Substring(0, 1);
token = token.Substring(1, token.Length - 1);
while (!token.EndsWith(term))
{
token += tokens[++n];
}
i.enqueue("STR", token.Substring(0, token.Length - 1));
}
}
// print("input: ",tokens);
// print("input: ",i.l);
// print("*************************************");
// Shift Reduce loop
while (i.l.Count > 0 || s.l.Count > 1)
{
//print("input: ",i.l);
//print("stack: ",s.l);
//print();
// REDUCE
if (s[2][0] == "STR" && s[1][0] == "PLUS" && s[0][0] == "STR")
{
int r = ToInt(s[2][1]) + ToInt(s[0][1]);
s.replace(3, "STR", r.ToString());
}
else if (s[2][0] == "STR" && s[1][0] == "MINUS" && s[0][0] == "STR")
{
int r = ToInt(s[2][1]) - ToInt(s[0][1]);
s.replace(3, "STR", r.ToString());
}
else if (s[2][0] == "STR" && s[1][0] == "DOT" && s[0][0] == "STR")
{
s.replace(3, "STR", s[2][1] + s[0][1]);
}
else if (s[2][0] == "STR" && s[1][0] == "EQUAL" && s[0][0] == "STR")
{
s.replace(3, "STR", (s[2][1] == s[0][1]) ? "True" : "");
}
else if (s[2][0] == "STR" && s[1][0] == "NOT_EQUAL" && s[0][0] == "STR")
{
s.replace(3, "STR", (s[2][1] != s[0][1]) ? "True" : "");
}
else if (s[2][0] == "STR" && s[1][0] == "AND" && s[0][0] == "STR")
{
s.replace(3, "STR", (s[2][1].Length > 0 && s[0][1].Length > 0) ? "True" : "");
}
else if (s[2][0] == "STR" && s[1][0] == "OR" && s[0][0] == "STR")
{
s.replace(3, "STR", (s[2][1].Length > 0 || s[0][1].Length > 0) ? "True" : "");
}
else if (s[2][0] == "LP" && s[1][0] == "STR" && s[0][0] == "RP")
{
s.replace(3, "STR", s[1][1]);
// SHIFT
}
else
{
s.push(i.pop());
}
}
// print("input: ",i.l);
// print("stack: ",s.l);
// print("eval",expr,s[0][1]);
return(s[0][1]);
} catch {
QU.rwe("Error evaluating : <br/><pre>" + expr);
return("ERROR");
}
}
