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CXScript.cs
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CXScript.cs
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using DynamicExpresso;
using System;
using System.Collections.Generic;
using System.Text;
namespace CXS
{
public enum CXType
{
NULL,
IF,
ELSE,
ENDIF,
WHILE,
ENDW,
BREAKW,
GOTO,
CALL,
}
public class CXObj
{
public CXObj(int l)
{
CurLine = l;
Type = CXType.NULL;
V1 = -1;
V2 = -1;
}
public CXType Type;
public int CurLine;
public int V1;
public int V2;
}
public class CXScript
{
Interpreter Interpreter;
object Context;
string[] Line;
int CurLine;
int ExeLine;
bool Exit;
Dictionary<int, CXObj> Flow = new Dictionary<int, CXObj>();
Stack<int> IFStack = new Stack<int>();
Stack<int> WStack = new Stack<int>();
Stack<int> CallStack = new Stack<int>();
public CXScript()
{
Interpreter = new Interpreter();
}
public string Dump()
{
var s = new StringBuilder();
foreach (var v in Interpreter.Identifiers) {
s.Append(v.Name);
s.Append(" = ");
s.AppendLine(v.Expression.ToString());
}
return s.ToString();
}
public void SetupContext(string name, object context)
{
Context = context;
Interpreter.SetVariable(name, Context);
}
public void SetVar(string name, object value)
{
Interpreter.SetVariable(name, value);
}
public object GetVar(string name)
{
try {
return Interpreter.Eval(name);
}
catch { return null; }
}
public void Compile(string script)
{
Line = script.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
for (int i = 0; i < Line.Length; i++)
Line[i] = Line[i].Trim();
for (int i = 0; i < Line.Length; i++) {
ExeLine = i;
if (Line[i].StartsWith("IF ")) {
Flow.Add(i, new CXObj(i) { Type = CXType.IF });
IFStack.Push(i);
} else if (Line[i] == "ELSE") {
if (IFStack.Count > 0) {
int l = IFStack.Peek();
if (Flow[l].V1 < 0) {
Flow[l].V1 = i;
Flow.Add(i, new CXObj(l) { Type = CXType.ELSE });
} else
throw new Exception("Unmatched ELSE");
} else
throw new Exception("ELSE unexpected");
} else if (Line[i] == "ENDIF") {
if (IFStack.Count > 0) {
int l = IFStack.Pop();
Flow[l].V2 = i;
Flow.Add(i, new CXObj(l) { Type = CXType.ENDIF });
} else
throw new Exception("ENDIF unexpected");
} else if (Line[i].StartsWith("WHILE ")) {
Flow.Add(i, new CXObj(i) { Type = CXType.WHILE });
WStack.Push(i);
} else if (Line[i] == "BREAKW") {
if (WStack.Count > 0) {
int l = WStack.Peek();
Flow.Add(i, new CXObj(l) { Type = CXType.BREAKW });
} else
throw new Exception("BREAKW unexpected");
} else if (Line[i] == "ENDW") {
if (WStack.Count > 0) {
int l = WStack.Pop();
Flow[l].V1 = i;
Flow.Add(i, new CXObj(l) { Type = CXType.ENDW });
} else
throw new Exception("ENDW unexpected");
} else if (Line[i].StartsWith("GOTO ")) {
string label = ":" + Line[i].Substring(5);
var idx = Array.FindIndex(Line, (x) => x == label);
if (idx >= 0)
Flow.Add(i, new CXObj(idx) { Type = CXType.GOTO });
else
throw new Exception("Label not found.");
} else if (Line[i].StartsWith("CALL ")) {
string label = ":" + Line[i].Substring(5);
var idx = Array.FindIndex(Line, (x) => x == label);
if (idx >= 0)
Flow.Add(i, new CXObj(idx) { Type = CXType.CALL });
else
throw new Exception("Label not found.");
}
}
if (IFStack.Count > 0) {
ExeLine = Flow[IFStack.Peek()].CurLine;
throw new Exception("ENDIF missing");
}
if (WStack.Count > 0) {
ExeLine = Flow[WStack.Peek()].CurLine;
throw new Exception("ENDW missing");
}
}
public object Execute(string script, out string Error)
{
Error = null;
Exit = false;
try {
Compile(script);
CurLine = 0;
while (CurLine < Line.Length && !Exit) {
ExeLine = CurLine;
if (Flow.ContainsKey(CurLine)) {
var f = Flow[CurLine];
if (f.Type == CXType.IF) {
if (Interpreter.Eval<bool>(Line[CurLine].Substring(3))) {
// DO NOTHING
} else {
if (f.V1 >= 0)
CurLine = f.V1;
else
CurLine = f.V2;
}
} else if (f.Type == CXType.ELSE) {
CurLine = Flow[f.CurLine].V2;
} else if (f.Type == CXType.WHILE) {
if (!Interpreter.Eval<bool>(Line[CurLine].Substring(6))) {
CurLine = f.V1;
}
} else if (f.Type == CXType.BREAKW) {
CurLine = Flow[f.CurLine].V1;
} else if (f.Type == CXType.ENDW) {
CurLine = Flow[f.CurLine].CurLine - 1;
} else if (f.Type == CXType.GOTO) {
CurLine = f.CurLine;
} else if (f.Type == CXType.CALL) {
CallStack.Push(CurLine);
CurLine = f.CurLine;
}
} else
Execute(CurLine);
CurLine++;
}
}
catch (Exception ex) {
Error = $"{ex.Message} - Line: {ExeLine + 1}\r\n{Line[ExeLine]}";
}
return Context;
}
private void Execute(int line)
{
System.Diagnostics.Debug.WriteLine($"{line}: {Line[line]}");
ExeLine = line;
if (string.IsNullOrWhiteSpace(Line[line]) || Line[line].StartsWith("//") || Line[line].StartsWith(":"))
return;
if (Line[line] == "EXIT") {
Exit = true;
return;
}
if (Line[line] == "RETURN") {
if (CallStack.Count > 0) {
CurLine = CallStack.Pop();
return;
} else
throw new Exception("RETURN without CALL");
}
if (Line[line].StartsWith("SET ")) {
int pos = Line[line].IndexOf("=");
if (pos < 0)
throw new Exception("Syntax Error");
string varname = Line[line].Substring(4, pos - 4).Trim();
Interpreter.SetVariable(varname, Interpreter.Eval(Line[line].Substring(pos + 1)));
return;
}
Lambda code;
code = Interpreter.Parse(Line[line]);
code.Invoke();
}
}
}