internal static string GenerateSymbolExpression(
Dictionary <string, ExpressionSymbol> symbolTable,
Dictionary <string, string> reverseSymbolTable,
string expression,
bool isFunction)
{
if (reverseSymbolTable.TryGetValue(
expression,
out var itemName))
{
return(itemName);
}
itemName = $"item{symbolTable.Count.ToString(CultureInfo.InvariantCulture).PadLeft(4, '0')}";
ExpressionSymbol symb = isFunction
? ExpressionSymbol.GenerateFunctionCall(
itemName,
expression)
: ExpressionSymbol.GenerateSymbol(
itemName,
expression);
symbolTable.Add(
itemName,
symb);
reverseSymbolTable.Add(
symb.Expression,
itemName);
return(itemName);
}
internal static ComputationBody CreateBody(WorkingExpressionSet workingSet)
{
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
foreach (Type extractorType in workingSet.Extractors.KeysByLevel.OrderBy(p => p.Key)
.SelectMany(p => p.Value).ToArray())
{
workingSet.Expression = workingSet.Extractors[extractorType].ExtractAllConstants(
workingSet.Expression,
workingSet.ConstantsTable,
workingSet.ReverseConstantsTable,
workingSet.Definition);
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
}
workingSet.Expression = workingSet.Expression.Trim().Replace(
" ",
string.Empty);
// Start preparing expression
workingSet.SymbolTable.Add(
string.Empty,
ExpressionSymbol.GenerateSymbol(
string.Empty,
workingSet.Expression));
// Prepares expression and takes care of operators to ensure that they are all OK and usable
workingSet.Initialize();
workingSet.SymbolTable[string.Empty].Expression = workingSet.Expression;
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
// Break expression based on function calls
FunctionsExtractor.ReplaceFunctions(
workingSet.Definition.Parentheses.Left,
workingSet.Definition.Parentheses.Right,
workingSet.Definition.ParameterSeparator,
workingSet.ConstantsTable,
workingSet.ReverseConstantsTable,
workingSet.SymbolTable,
workingSet.ReverseSymbolTable,
workingSet.Interpreters,
workingSet.ParameterRegistry,
workingSet.SymbolTable[string.Empty].Expression,
workingSet.AllSymbols);
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
// We save a split expression for determining parameter order
var splitExpression = workingSet.Expression.Split(
workingSet.AllSymbols.ToArray(),
StringSplitOptions.RemoveEmptyEntries);
// Break by parentheses
ParenthesesParser.FormatParentheses(
workingSet.Definition.Parentheses.Left,
workingSet.Definition.Parentheses.Right,
workingSet.Definition.ParameterSeparator,
workingSet.AllOperatorsInOrder,
workingSet.SymbolTable,
workingSet.ReverseSymbolTable);
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
// Populating symbol tables
foreach (var p in workingSet.SymbolTable.Where(p => !p.Value.IsFunctionCall)
.Select(p => p.Value.Expression))
{
TablePopulationGenerator.PopulateTables(
p,
workingSet.ConstantsTable,
workingSet.ReverseConstantsTable,
workingSet.SymbolTable,
workingSet.ReverseSymbolTable,
workingSet.ParameterRegistry,
workingSet.Interpreters,
workingSet.Expression,
workingSet.Definition.Parentheses.Left,
workingSet.AllSymbols);
}
// For each parameter from the table we've just populated, see where it's first used, and fill in that index as the order
foreach (ParameterContext paramForOrdering in workingSet.ParameterRegistry.Dump())
{
paramForOrdering.Order = Array.IndexOf(
splitExpression,
paramForOrdering.Name);
}
if (workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
// Generate expressions
NodeBase?body;
try
{
body = GenerateExpression(
workingSet.SymbolTable[string.Empty].Expression,
workingSet);
}
catch
{
body = null;
}
if (body == null || workingSet.CancellationToken.IsCancellationRequested)
{
return(ComputationBody.Empty);
}
if (body is ConstantNodeBase && workingSet.ParameterRegistry.Populated)
{
return(ComputationBody.Empty);
}
workingSet.Success = true;
return(new ComputationBody(
body,
workingSet.ParameterRegistry));
}