private Expression ToExpression(byte[] bytes, Prg prg, int offset = 0,
FileVersion version = FileVersion.Current, bool isTrace = false)
{
var expressions = GetExpressions(bytes, prg, ref offset, FileVersion, isTrace: isTrace);
if (offset != bytes.Length || expressions.Count != 1)
{
Debug.WriteLine($@"Bad part:
bytes: {DebugUtilities.CompareBytes(bytes, bytes, onlyDif: false, toText: false)}
offset: {offset}
bytes.Length: {bytes.Length}
expressions: {expressions.Count}
");
}
//One expression
if (expressions.Count == 1)
{
return(expressions[0]);
}
return(null);
}
private List <Expression> GetExpressions(byte[] bytes, Prg prg, ref int offset,
FileVersion version = FileVersion.Current, LINE_TOKEN lineToken = 0,
bool isTrace = false)
{
if (isTrace)
{
Debug.WriteLine("----------------------------");
Debug.WriteLine(DebugUtilities.CompareBytes(bytes, bytes,
onlyDif: false, toText: false, offset: offset));
}
var expressions = new List <Expression>();
while (offset < bytes.Length)
{
var byteType = ProgramCodeUtilities.GetByteType(bytes, offset);
if (byteType == ProgramCodeUtilities.ByteType.Variable)
{
if (isTrace)
{
Debug.WriteLine($"IsVariable {offset}");
}
var expression = new VariableExpression(bytes, prg, ref offset, FileVersion);
expressions.Add(expression);
}
else if (byteType == ProgramCodeUtilities.ByteType.Line)
{
if (isTrace)
{
Debug.WriteLine($"IsLine {offset}");
}
var token = (LINE_TOKEN)bytes.ToByte(ref offset);
var lineExpressions = GetExpressions(bytes, prg, ref offset, version, token, isTrace);
var expression = lineExpressions.Count > 1 ? new BinaryExpression(
lineExpressions[0],
lineExpressions[1],
(TYPE_TOKEN)token, FileVersion) :
lineExpressions[0];
expressions.Add(expression);
}
else if (byteType == ProgramCodeUtilities.ByteType.Function)
{
if (isTrace)
{
Debug.WriteLine($"IsFunction {offset}");
}
var token = (FUNCTION_TOKEN)bytes.ToByte(ref offset);
if ((byte)token == (byte)LINE_TOKEN.STOP)
{
var variable = new VariableExpression(bytes, prg, ref offset, FileVersion);
var expression = new UnaryExpression(variable, (TYPE_TOKEN)LINE_TOKEN.STOP, version);
expressions.Add(expression);
}
else if (expressions.Count == 0)
{
Debug.WriteLine("expressions.Count = 0");
var temp = 0;
offset -= 1;
expressions.Add(new VariableExpression(bytes, prg, ref offset, FileVersion));
expressions.AddRange(
GetExpressions(bytes.ToBytes(ref offset, 3), prg, ref temp, FileVersion, lineToken));
var prevLastExpression = expressions[expressions.Count - 2];
var lastExpression = expressions[expressions.Count - 1];
expressions.RemoveAt(expressions.Count - 1);
expressions.RemoveAt(expressions.Count - 1);
var expression = new BinaryExpression(prevLastExpression, lastExpression, TYPE_TOKEN.DELIMITER, FileVersion);
expressions.Add(expression);
}
else
{
var expression = new FunctionExpression(token, FileVersion, expressions.ToArray());
expressions.Clear();
expressions.Add(expression);
}
}
else if (byteType == ProgramCodeUtilities.ByteType.Expression)
{
if (isTrace)
{
Debug.WriteLine($"IsExpression {offset}");
}
var type = (TYPE_TOKEN)bytes.ToByte(ref offset);
if (ProgramCodeUtilities.IsBinaryExpression(type))
{
var prevLastExpression = expressions[expressions.Count - 2];
var lastExpression = expressions[expressions.Count - 1];
expressions.RemoveAt(expressions.Count - 1);
expressions.RemoveAt(expressions.Count - 1);
var expression = new BinaryExpression(prevLastExpression, lastExpression, type, FileVersion);
expressions.Add(expression);
}
else
{
var lastExpression = expressions[expressions.Count - 1];
expressions.RemoveAt(expressions.Count - 1);
var expression = new UnaryExpression(lastExpression, type, FileVersion);
expressions.Add(expression);
}
}
else
{
break;
}
}
if (isTrace)
{
Debug.WriteLine($"Result: {expressions.Count} expressions. Line token: {lineToken}");
for (var i = 0; i < expressions.Count; ++i)
{
Debug.WriteLine($"Expression {i + 1}: {expressions[i].ToString()}");
}
Debug.WriteLine("----------------------------");
Debug.WriteLine("");
}
return(expressions);
}