/**
* Reads the next script element from the stream.
* This could be an entire command or a single parameter.
*/
ScriptElement NextScriptElement(Stream s)
{
BinaryReader br = new BinaryReader(s);
ScriptElement elem = null;
// read the next data element.
DataElement cmd = NextDataElement(s);
// if no data element could be found, ...
if (cmd == null)
{
// ...return nothing.
return(null);
}
// if the element is...
switch (cmd.type)
{
// ...a function call, then...
case DataElement.TYPE_FUNC: {
// ...determine how many parameters the function call takes.
int paramCount = br.ReadInt32();
ScriptElement[] parameters = new ScriptElement[paramCount];
// for each parameter...
for (var j = 0; j < paramCount; j++)
{
// ...read it's value
DataElement param = NextDataElement(s);
// if the parameter is a temporary variable reference, then...
if (param is VarTempRefDataElement)
{
// ...replace it by the appropriate substitution expression.
parameters[j] = substituteExpressions[((VarTempRefDataElement)param).id];
// after that, continue with the next parameter.
continue;
}
// if the function is called...
// ..."StrOut" and this parameter is a string, ...
if ((((FuncDataElement)cmd).name.Equals("StrOut") || ((FuncDataElement)cmd).name.Equals("StrOutNW")) && param is StringDataElement)
{
// (...then this is a line of text to be displayed.)
// (we want to store those in a separate file to make it easier to translate them.)
// get the text
string line = ((StringDataElement)param).data;
// generate a new line number
string id = "L" + (++lineCount);
// add those to the list of known strings...
stringTable.Add(id, new ScriptLine(fontID, speaker, line));
// ...and replace the string parameter with reference to the line number
parameters[j] = new DataScriptElement(new ExternalStringDataElement(id, stringTable));
}
// ..."StrOutNWC", ...
else if (((FuncDataElement)cmd).name.Equals("StrOutNWC"))
{
// (...then this parameter represents a name.)
// if the parameter is...
// ...a string, then...
if (param is StringDataElement)
{
// (...we want to store it separately to make it easier to translate.)
string name = ((StringDataElement)param).data;
// set the current speaker to this name.
speaker = name;
string id = null;
// for each entry on our list of known strings...
foreach (var entry in stringTable)
{
// ...check if it is a name.
if (entry.Key[0] == 'N' && entry.Value.Text.Equals(name))
{
// if it is, remember it's ID...
id = entry.Key;
// ...and stop searching.
break;
}
}
// if you didn't find a matching ID, ...
if (id == null)
{
// generate a new one...
id = "N" + (++nameCount);
// ...and add it - together with the name - to the list of known strings.
stringTable.Add(id, new ScriptLine(-1, null, name));
}
// finally, replace the parameter by a reference to the name ID.
parameters[j] = new DataScriptElement(new ExternalStringDataElement(id, stringTable));
}
// ...a variable string reference, then...
else if (param is VarStringRefDataElement)
{
// ...set the current speaker to "me"...
speaker = "me";
// ...and keep the parameter as it is.
parameters[j] = new DataScriptElement(param);
}
// ...something else, ...
else
{
// ...then we just keep it as it is.
parameters[j] = new DataScriptElement(param);
}
}
// ...none of the above, ...
else
{
// ...then we just keep the parameter as it is.
parameters[j] = new DataScriptElement(param);
}
}
// if the function is called "PF" (PrintFlush?), then...
if (((FuncDataElement)cmd).name.Equals("PF"))
{
// ...reset the current speaker.
speaker = "";
}
// if the function is called "FontSet" and the second parameter is an integer, then...
if (((FuncDataElement)cmd).name.Equals("FontSet") && parameters.Length >= 2 && parameters[1] is DataScriptElement dataElem && dataElem.elem is IntDataElement intElem)
{
// ...keep track of the current font
fontID = intElem.data;
}
// save the current position in the code stream.
long pos = s.Position;
// read the next data element
DataElement next = NextDataElement(s);
// check if the next data element is a opening control flow element.
// if it is, then...
if (next is ControlDataElement && ((ControlDataElement)next).name.Equals("{"))
{
// ...create an empty list of script elements.
List <ScriptElement> body = new List <ScriptElement>();
ScriptElement cur;
// (read script elements and add them to the list of commands until you encounter a closing flow control element.)
// repeat:
while (true)
{
// read the next script element.
cur = NextScriptElement(s);
// if it is a closing flow control element, ...
if (cur is JumpLabelScriptElement && ((JumpLabelScriptElement)cur).name.Equals("}"))
{
// ...stop repeating immediately
break;
}
// otherwise, add it to the list of commands.
body.Add(cur);
}
// if the function is a branching operation, then...
if (((FuncDataElement)cmd).name.Equals("if"))
{
// ...save the current position in the code stream.
pos = s.Position;
// read the next data element
next = NextDataElement(s);
// check if the next data element is a else clause.
// if it is, then...
if (next is ControlDataElement && ((ControlDataElement)next).name.Equals("else"))
{
// ...discard the opening flow control element.
NextDataElement(s);
// ...create an empty list of script elements.
List <ScriptElement> falsebody = new List <ScriptElement>();
// (read script elements and add them to the list of commands until you encounter a closing flow control element.)
// repeat:
while (true)
{
// read the next script element.
cur = NextScriptElement(s);
// if it is a closing flow control element, ...
if (cur is JumpLabelScriptElement && ((JumpLabelScriptElement)cur).name.Equals("}"))
{
// ...stop repeating immediately
break;
}
// otherwise, add it to the list of commands.
falsebody.Add(cur);
}
// use the first (and only) parameter of the function call as branching condition, wrap it - together with the code blocks - in a script element and save it as the result.
elem = new BranchScriptElement(parameters[0], body, falsebody);
}
// it it's not, then...
else
{
// ...jump back to the previously saved code position.
s.Seek(pos, SeekOrigin.Begin);
// use the first (and only) parameter of the function call as branching condition, wrap it - together with the code block - in a script element and save it as the result.
elem = new BranchScriptElement(parameters[0], body, null);
}
}
// if it it not, then
else
{
elem = new SwitchFunctionScriptElement(((FuncDataElement)cmd).name, parameters, body);
}
}
// if not, ...
else
{
// ...jump back to the previously saved code position.
s.Seek(pos, SeekOrigin.Begin);
// wrap the method name and and list of parameters in a script element and save it as the result.
elem = new FuncCallScriptElement(((FuncDataElement)cmd).name, parameters);
}
break;
}
// ...a flow control element, then...
case DataElement.TYPE_CTRL: {
// ...create a new jump label with the same name and save it as the result.
elem = new JumpLabelScriptElement(((ControlDataElement)cmd).name);
break;
}
// ...a variable int or string reference, then...
case DataElement.TYPE_VINT:
case DataElement.TYPE_VSTR: {
// (...we expect an assignment operation to follow.)
// read assigned expression.
ScriptElement expression = NextAssignment(s);
// wrap the variable int/string reference and the expression in a new script element and save it as the result.
elem = new AssignmentScriptElement(cmd, expression);
break;
}
// ...a temporary variable id, then...
case DataElement.TYPE_VTMP: {
// (...we expect an assignment operation to follow.)
// (after that we expect a command which uses this temporary variable.)
// read assigned expression.
ScriptElement expression = NextAssignment(s);
// set the current temp variable expression to the one we just read...
substituteExpressions[((VarTempRefDataElement)cmd).id] = expression;
// ...and return nothing this time.
break;
}
// ...an integer constant, then...
case DataElement.TYPE_CINT: {
// (...we have reached a very confusing part of this binary script format.)
// (we expect an assignment to follow, basically "0 = <something>".)
// (this sets the current flag pointer (represented by the 0) to <something>.)
// (the flag pointed to by the pointer can be a accessed by using flag_$, globalflag_$, str_$ or globalstr_$.)
// read the next script element (the expected assignment).
FuncCallScriptElement assignment = NextScriptElement(s) as FuncCallScriptElement;
ScriptElement expression = null;
// if the assignment has...
// ...more than 1 element, ...
if (assignment.parameters.Length > 1)
{
// ...then create an expression from those.
expression = new ExpressionScriptElement(assignment.parameters);
}
// ...exactly 1 element, ...
else if (assignment.parameters.Length == 1)
{
// ...then it already is a valid expression.
expression = assignment.parameters[0];
}
// ...no elements, ...
else
{
// ...then read the next script element and use it as expression.
expression = NextScriptElement(s);
}
// wrap the integer and the expression in a new script element and save it as the result.
elem = new AssignmentScriptElement(cmd, expression);
break;
}
// ...something else, ...
default: {
// the script is probably damaged, so we throw an error.
throw new Exception("Script format invalid");
}
}
// return the saved result
return(elem);
}
ScriptElement NextAssignment(Stream s)
{
// read the next script element (the expected assignment).
FuncCallScriptElement assignment = NextScriptElement(s) as FuncCallScriptElement;
ScriptElement[] parameters = new ScriptElement[assignment.parameters.Length];
// go through all parameters of the assignment.
for (int i = 0; i < assignment.parameters.Length; i++)
{
ScriptElement param = assignment.parameters[i];
// if the parameter is...
// ...a string constant, then...
if (param is DataScriptElement && ((DataScriptElement)param).elem is StringDataElement)
{
// ...retrieve it's value.
string str = ((StringDataElement)((DataScriptElement)param).elem).data;
// if it contains only whitespace, if it is a number, or if it is part of a file name, then...
if (str.Trim().Length == 0 || str.All(char.IsDigit) || str.Contains("\\") || str.ToLower().Contains(".yk") || str.ToLower().Contains(".ogg"))
{
// ...just use it in the expression.
parameters[i] = param;
}
// otherwise...
else
{
string id = null;
// ...generate a new one...
id = "S" + (++stringCount);
// ...and add it to the list of known strings.
stringTable.Add(id, new ScriptLine(-1, null, str));
// then use an external string reference as the new expression.
parameters[i] = new DataScriptElement(new ExternalStringDataElement(id, stringTable));
}
}
// ...a temporary variable reference, then...
else if (param is DataScriptElement && ((DataScriptElement)param).elem is VarTempRefDataElement)
{
// ...replace it by the current substitution expression.
parameters[i] = substituteExpressions[((VarTempRefDataElement)((DataScriptElement)param).elem).id];
}
// ...something else, then...
else
{
// ...just use it in the expression.
parameters[i] = param;
}
}
ScriptElement expression = null;
// if the assignment has...
// ...more than 1 elements, then...
if (parameters.Length > 1)
{
// ...create an expression from those.
expression = new ExpressionScriptElement(parameters);
}
// ...exactly 1 element, then...
else if (assignment.parameters.Length == 1)
{
expression = parameters[0];
}
// ...no elements, ...
else
{
// ...then read the next script element and use it as expression.
expression = NextScriptElement(s);
}
return(expression);
}