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| 773 | |
| 774 | //------------------------------------------------------------------------------ |
| 775 | bool vtkExprTkFunctionParser::Evaluate() |
| 776 | { |
| 777 | if (this->FunctionMTime.GetMTime() > this->ParseMTime.GetMTime()) |
| 778 | { |
| 779 | this->SizeMode = DetermineSizeMode(this->FunctionWithUsedVariableNames); |
| 780 | // compile with mode 0 to identify return type |
| 781 | if (this->Parse(ParseMode::DetectReturnType) == 0) |
| 782 | { |
| 783 | return false; |
| 784 | } |
| 785 | // perform evaluation to identify the return type |
| 786 | this->ExprTkTools->Expression.value(); |
| 787 | const auto& results = this->ExprTkTools->Expression.results(); |
| 788 | if (this->SizeMode == SizeModes::AutoDetected) |
| 789 | { |
| 790 | auto result = results[0]; |
| 791 | this->ResultType = result.type; |
| 792 | if (result.size != 0) |
| 793 | { |
| 794 | this->ResultSize = static_cast<int>(result.size); |
| 795 | } |
| 796 | else |
| 797 | { |
| 798 | // if the parser could not identify the size, set it to 3 for vector and 1 for scalar |
| 799 | this->ResultSize = this->ResultType == ExprTkResultType::e_vector ? 3 : 1; |
| 800 | } |
| 801 | } |
| 802 | else // (this->SizeMode == SizeModes::VectorDefined) |
| 803 | { |
| 804 | this->ResultSize = static_cast<int>(results.count()); |
| 805 | this->ResultType = |
| 806 | this->ResultSize > 1 ? ExprTkResultType::e_vector : ExprTkResultType::e_scalar; |
| 807 | // assert that all results have type e_scalar and size 1 |
| 808 | for (size_t i = 0; i < results.count(); ++i) |
| 809 | { |
| 810 | if (results[i].type != ExprTkResultType::e_scalar || results[i].size != 1) |
| 811 | { |
| 812 | vtkErrorMacro("In VectorDefined size mode, all components must be scalars of size 1."); |
| 813 | this->ResultType = ExprTkResultType::e_unknown; |
| 814 | } |
| 815 | } |
| 816 | } |
| 817 | this->Result.resize(this->ResultSize); |
| 818 | this->ParserErrorResult.resize(this->ResultSize, std::numeric_limits<double>::quiet_NaN()); |
| 819 | |
| 820 | // compile with mode 1 to save results in the result array |
| 821 | if (this->Parse(ParseMode::SaveResultInVariable) == 0) |
| 822 | { |
| 823 | return false; |
| 824 | } |
| 825 | } |
| 826 | // perform evaluation |
| 827 | this->ExprTkTools->Expression.value(); |
| 828 | // check for invalid results |
| 829 | if (this->ResultType == ExprTkResultType::e_unknown) |
| 830 | { |
| 831 | return false; |
| 832 | } |