public static Parser GetInstance()
{
if (singleton == null)
{
singleton = new SillyParser(null);
}
return(singleton);
}
/// <summary>
/// Interpret a matrix, where semicolons ";" seperate rows and commas "," seperate columns.
/// The cell values can be any sort of expression, including variables.
/// The cell values may contain operators that use commas "," eg "add(a, b)".
/// The cell values can also use the more standard forms of algebraic expressions eg "a + b".
///
/// Valid operators are:
/// <code>plus, minus, mul, div, remainder, negate, exp, sin, cos, tan, asin, acos, atan, atan2</code>
/// </summary>
public Matrix InterpretMatrix(string matrixStr)
{
string[] rows = matrixStr.Split(';');
Node[,] values = null;
Parser p = SillyParser.GetInstance();
int colLength = 0;
for (int rowIndex = 0; rowIndex < rows.Length; rowIndex++)
{
try
{
Node[] rowVals = InterpretListOfNodes(rows[rowIndex]);
int newColLength = rowVals.Length;
if (values == null)
{
values = new Node[rows.Length, rowVals.Length];
colLength = values.GetLength(1);
}
else if (colLength != newColLength)
{
throw new FormatException($"Expected '{colLength}' columns on every row, but found '{newColLength}' columns in '{rows[rowIndex]}'");
}
for (int colIndex = 0; colIndex < colLength; colIndex++)
{
values[rowIndex, colIndex] = rowVals[colIndex];
}
}
catch (FormatException e)
{
throw new FormatException($"Error at row index '{rowIndex}'!", e);
}
}
return(new Matrix(values));
}