public Expression(LogicalExpression expression, EvaluateOptions options)
{
if (expression == null)
throw new
ArgumentException("Expression can't be null", "expression");
ParsedExpression = expression;
Options = options;
}
public TernaryExpression(LogicalExpression leftExpression, LogicalExpression middleExpression, LogicalExpression rightExpression)
{
this.LeftExpression = leftExpression;
this.MiddleExpression = middleExpression;
this.RightExpression = rightExpression;
}
public string CalExpressionTreeResult(NCalc2.Expressions.LogicalExpression lgInput, int intSpaceInput)
{
if (lgInput == null)
{
return("\r\n");
}
//
string strRet = "";
string strTemp = "";
int i, j = 0;
//Each time we call this function in another level, add more indication space
int intSpace = intSpaceInput + 1;
//
if ((lgInput == null) || (lgInput.objResult == null)) //This one is Recursion stop condition
{
strRet = strRet + "null" + "\r\n";
}
else if (lgInput is NCalc2.Expressions.ValueExpression) //This one is Recursion stop condition
{
NCalc2.Expressions.ValueExpression ValueEx = (NCalc2.Expressions.ValueExpression)lgInput;
strRet = strRet + lgInput.ToString() + ":" + ValueEx.Value.ToString() + "\r\n";
}
else if (lgInput is NCalc2.Expressions.IdentifierExpression) //This one is Recursion stop condition
{
strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
}
else if (lgInput is NCalc2.Expressions.FunctionExpression) //This case may do recursion
{
strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
//
NCalc2.Expressions.FunctionExpression FuncExpress = (NCalc2.Expressions.FunctionExpression)lgInput;
for (j = 0; j < intSpace; j++)
{
strTemp = strTemp + "___";
}
for (i = 0; i < FuncExpress.Expressions.Length; i++)
{
strRet = strRet + strTemp + this.CalExpressionTreeResult(FuncExpress.Expressions[i], intSpace);// + "\r\n";
}
}
else if (lgInput is NCalc2.Expressions.BinaryExpression) //This case may do recursion
{
NCalc2.Expressions.BinaryExpression BinaryEx = (NCalc2.Expressions.BinaryExpression)lgInput;
strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
for (j = 0; j < intSpace; j++)
{
strTemp = strTemp + "___";
}
strRet = strRet + strTemp + this.CalExpressionTreeResult(BinaryEx.LeftExpression, intSpace); // + "\r\n";
strRet = strRet + strTemp + this.CalExpressionTreeResult(BinaryEx.RightExpression, intSpace); // + "\r\n";
}
else if (lgInput is NCalc2.Expressions.TernaryExpression) //This case may do recursion
{
NCalc2.Expressions.TernaryExpression TernaryEx = (NCalc2.Expressions.TernaryExpression)lgInput;
strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
for (j = 0; j < intSpace; j++)
{
strTemp = strTemp + "___";
}
strRet = strRet + strTemp + this.CalExpressionTreeResult(TernaryEx.LeftExpression, intSpace); // + "\r\n";
strRet = strRet + strTemp + this.CalExpressionTreeResult(TernaryEx.MiddleExpression, intSpace); // + "\r\n";
strRet = strRet + strTemp + this.CalExpressionTreeResult(TernaryEx.RightExpression, intSpace); // + "\r\n";
}
else if (lgInput is NCalc2.Expressions.UnaryExpression) //This case may do recursion
{
NCalc2.Expressions.UnaryExpression UnaryEx = (NCalc2.Expressions.UnaryExpression)lgInput;
strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
for (j = 0; j < intSpace; j++)
{
strTemp = strTemp + "___";
}
strRet = strRet + strTemp + this.CalExpressionTreeResult(UnaryEx.Expression, intSpace);// + "\r\n";
}
else //This one is Recursion stop condition
{
//strRet = strRet + lgInput.ToString() + ": " + lgInput.objResult.ToString() + "\r\n";
}
//
return(strRet);
}
public BinaryExpression(BinaryExpressionType type, LogicalExpression leftExpression, LogicalExpression rightExpression)
{
Type = type;
LeftExpression = leftExpression;
RightExpression = rightExpression;
}
public UnaryExpression(UnaryExpressionType type, LogicalExpression expression)
{
Type = type;
Expression = expression;
}
public TernaryExpression(LogicalExpression leftExpression, LogicalExpression middleExpression, LogicalExpression rightExpression)
{
this.LeftExpression = leftExpression;
this.MiddleExpression = middleExpression;
this.RightExpression = rightExpression;
}
public BinaryExpression(BinaryExpressionType type, LogicalExpression leftExpression, LogicalExpression rightExpression)
{
Type = type;
LeftExpression = leftExpression;
RightExpression = rightExpression;
}
/// <summary>
/// Pre-compiles the expression in order to check syntax errors.
/// If errors are detected, the Error property contains the message.
/// </summary>
/// <returns>True if the expression syntax is correct, otherwiser False</returns>
public bool HasErrors()
{
try
{
if (ParsedExpression == null)
{
ParsedExpression = Compile(OriginalExpression, (Options & EvaluateOptions.NoCache) == EvaluateOptions.NoCache);
}
// In case HasErrors() is called multiple times for the same expression
return ParsedExpression != null && Error != null;
}
catch (Exception e)
{
Error = e.Message;
return true;
}
}
public object Evaluate()
{
if (HasErrors())
{
throw new EvaluationException(Error);
}
if (ParsedExpression == null)
{
ParsedExpression = Compile(OriginalExpression, (Options & EvaluateOptions.NoCache) == EvaluateOptions.NoCache);
}
var visitor = new EvaluationVisitor(Options);
visitor.EvaluateFunction += EvaluateFunction;
visitor.EvaluateParameter += EvaluateParameter;
visitor.Parameters = Parameters;
// if array evaluation, execute the same expression multiple times
if ((Options & EvaluateOptions.IterateParameters) == EvaluateOptions.IterateParameters)
{
int size = -1;
ParametersBackup = new Dictionary<string, object>();
foreach (string key in Parameters.Keys)
{
ParametersBackup.Add(key, Parameters[key]);
}
ParameterEnumerators = new Dictionary<string, IEnumerator>();
foreach (object parameter in Parameters.Values)
{
if (parameter is IEnumerable)
{
int localsize = 0;
foreach (object o in (IEnumerable)parameter)
{
localsize++;
}
if (size == -1)
{
size = localsize;
}
else if (localsize != size)
{
throw new EvaluationException("When IterateParameters option is used, IEnumerable parameters must have the same number of items");
}
}
}
foreach (string key in Parameters.Keys)
{
var parameter = Parameters[key] as IEnumerable;
if (parameter != null)
{
ParameterEnumerators.Add(key, parameter.GetEnumerator());
}
}
var results = new List<object>();
for (int i = 0; i < size; i++)
{
foreach (string key in ParameterEnumerators.Keys)
{
IEnumerator enumerator = ParameterEnumerators[key];
enumerator.MoveNext();
Parameters[key] = enumerator.Current;
}
ParsedExpression.Accept(visitor);
results.Add(visitor.Result);
}
return results;
}
ParsedExpression.Accept(visitor);
return visitor.Result;
}
public FunctionExpression(IdentifierExpression identifier, LogicalExpression[] expressions)
{
Identifier = identifier;
Expressions = expressions;
}
protected void EncapsulateNoValue(LogicalExpression expression)
{
if (expression is ValueExpression)
{
expression.Accept(this);
}
else
{
Result.Append("(");
expression.Accept(this);
// trim spaces before adding a closing paren
while (Result[Result.Length - 1] == ' ')
Result.Remove(Result.Length - 1, 1);
Result.Append(") ");
}
}
