public EvaluatorStream(int BufferSize, Evaluator Evaluator, SoundOptions Options, bool Exporting)
{
this._Exporting = Exporting;
this._Options = Options;
this._Evaluator = Evaluator.GetBuffered(BufferSize);
this._Offset = BufferSize;
this._Parameter = Options.Offset;
// Calculate shift and sample size
int res = Options.Resolution;
int sampsize = (res + 7) / 8;
int shift = sampsize * 8 - res;
this._SampleSize = sampsize;
this._Shift = shift;
this._Advance();
}
/// <summary>
/// Plays the given expression with the given options.
/// </summary>
private void _Play(Expression Expression, SoundOptions Options)
{
this._Sound.Stop(); // Just to make sure.
if (this._Sound.Play(new EvaluatorStream(4096, Expression, Options, false)))
{
this._Update = false;
this._PlayStop.Text = _StopText;
}
else
{
MessageBox.Show("Could not create sound output, check values of \"#rate\" and \"#resolution\".", MessageBoxCaption, MessageBoxButtons.OK);
this._PlayStop.Text = _PlayText;
}
}
/// <summary>
/// Tries parsing the selected contents of this form, displaying the appropriate messages on failure.
/// </summary>
private bool _ParseSelected(out Expression Expression, out SoundOptions Options)
{
Expression = null;
Options = null;
int targetindex = this._Text.SelectionStart;
int targetlength = this._Text.SelectionLength;
int errorindex = targetindex;
if (targetlength > 0 && Parser.Parse(this._Text.Text, targetindex, targetlength, out Expression, out Options, out errorindex))
{
return true;
}
else
{
this._Text.Select(errorindex, 0);
return false;
}
}
/// <summary>
/// Tries parsing the contents of this form, displaying the appropriate messages on failure.
/// </summary>
private bool _Parse(out Expression Expression, out SoundOptions Options)
{
int errorindex;
if (Parser.Parse(this._Text.Text, out Expression, out Options, out errorindex))
{
if (Expression != null)
{
return true;
}
else
{
MessageBox.Show("The result variable \"" + Parser.Result + "\" must be defined", MessageBoxCaption, MessageBoxButtons.OK);
return false;
}
}
else
{
this._Text.Select(errorindex, 0);
return false;
}
}
/// <summary>
/// Parses the given text (or as much as possible of it) and returns the expression for the specified target string, or false with an error index.
/// </summary>
public static bool Parse(string Text, int TargetIndex, int TargetLength, out Expression Expression, out SoundOptions Options, out int ErrorIndex)
{
Expression = null;
Options = new SoundOptions();
Dictionary<string, Expression> variables = null;
int index = 0;
AcceptProgram(Text, ref index, ref variables, ref Options, out ErrorIndex);
if (index >= TargetIndex)
{
index = 0;
string target = Text.Substring(TargetIndex, TargetLength);
AcceptExtendedWhitespace(target, ref index);
if (AcceptExpression(variables, target, ref index, ref Expression, out ErrorIndex))
{
AcceptExtendedWhitespace(target, ref index);
if (index == TargetLength)
{
return true;
}
}
ErrorIndex += TargetIndex;
return false;
}
return false;
}
/// <summary>
/// Parses the given text and either returns true with an expression and sound options, or false with an error index.
/// </summary>
public static bool Parse(string Text, out Expression Expression, out SoundOptions Options, out int ErrorIndex)
{
Expression = null;
Options = new SoundOptions();
Dictionary<string, Expression> variables = null;
int index = 0;
AcceptProgram(Text, ref index, ref variables, ref Options, out ErrorIndex);
if (index == Text.Length)
{
variables.TryGetValue(Result, out Expression);
return true;
}
return false;
}
/// <summary>
/// Parses a program in the given text.
/// </summary>
public static void AcceptProgram(string Text, ref int Index, ref Dictionary<string, Expression> Variables, ref SoundOptions Options, out int ErrorIndex)
{
Variables = new Dictionary<string, Expression>();
Variables[Parameter] = IdentityExpression.Instance;
Variables[Resolution] = ResolutionExpression.Instance;
while (true)
{
AcceptExtendedWhitespace(Text, ref Index);
if (AcceptOption(Text, ref Index, Options, out ErrorIndex))
{
continue;
}
string varname = null;
Expression varvalue = null;
if (AcceptAssignment(Variables, Text, ref Index, ref varname, ref varvalue, out ErrorIndex))
{
Variables[varname] = varvalue;
continue;
}
break;
}
AcceptExtendedWhitespace(Text, ref Index);
}
/// <summary>
/// Tries parsing an option and applying it to the given sound options structure.
/// </summary>
public static bool AcceptOption(string Text, ref int Index, SoundOptions Options, out int ErrorIndex)
{
string optname = null;
int optvalue = 0;
if (AcceptOption(Text, ref Index, ref optname, ref optvalue, out ErrorIndex))
{
switch (optname)
{
case "rate":
Options.Rate = optvalue;
break;
case "offset":
Options.Offset = optvalue;
break;
case "length":
Options.Length = optvalue;
break;
case "resolution":
Options.Resolution = optvalue;
break;
default:
break;
}
return true;
}
return false;
}
public EvaluatorStream(int BufferSize, Expression Expression, SoundOptions Options, bool Exporting)
: this(BufferSize, Expression.GetEvaluator(new Dictionary<Expression,Evaluator>(), BufferSize, Options.Resolution), Options, Exporting)
{
}