------------------------------------------------------------------------------
| 154 | |
| 155 | //------------------------------------------------------------------------------ |
| 156 | int vtkFunctionParser::DisambiguateOperators() |
| 157 | { |
| 158 | unsigned char* tempStack = new unsigned char[this->ByteCodeSize]; |
| 159 | int i; |
| 160 | int tempStackPtr = -1; |
| 161 | |
| 162 | // using 0 for scalars and 1 for vectors |
| 163 | for (i = 0; i < this->ByteCodeSize; i++) |
| 164 | { |
| 165 | switch (this->ByteCode[i]) |
| 166 | { |
| 167 | case VTK_PARSER_IMMEDIATE: |
| 168 | tempStackPtr++; |
| 169 | tempStack[tempStackPtr] = 0; |
| 170 | break; |
| 171 | case VTK_PARSER_UNARY_MINUS: |
| 172 | if (tempStack[tempStackPtr] != 0) |
| 173 | { |
| 174 | this->ByteCode[i] = VTK_PARSER_VECTOR_UNARY_MINUS; |
| 175 | } |
| 176 | break; |
| 177 | case VTK_PARSER_UNARY_PLUS: |
| 178 | if (tempStack[tempStackPtr] != 0) |
| 179 | { |
| 180 | this->ByteCode[i] = VTK_PARSER_VECTOR_UNARY_PLUS; |
| 181 | } |
| 182 | break; |
| 183 | case VTK_PARSER_ADD: |
| 184 | if (tempStack[tempStackPtr] != 0 && tempStack[tempStackPtr - 1] != 0) |
| 185 | { |
| 186 | this->ByteCode[i] = VTK_PARSER_VECTOR_ADD; |
| 187 | } |
| 188 | else if ((tempStack[tempStackPtr] == 0 && tempStack[tempStackPtr - 1] != 0) || |
| 189 | (tempStack[tempStackPtr] != 0 && tempStack[tempStackPtr - 1] == 0)) |
| 190 | { |
| 191 | delete[] tempStack; |
| 192 | vtkErrorMacro("addition expects either 2 vectors or 2 scalars"); |
| 193 | return 0; |
| 194 | } |
| 195 | tempStackPtr--; |
| 196 | break; |
| 197 | case VTK_PARSER_SUBTRACT: |
| 198 | if (tempStack[tempStackPtr] != 0 && tempStack[tempStackPtr - 1] != 0) |
| 199 | { |
| 200 | this->ByteCode[i] = VTK_PARSER_VECTOR_SUBTRACT; |
| 201 | } |
| 202 | else if ((tempStack[tempStackPtr] == 0 && tempStack[tempStackPtr - 1] != 0) || |
| 203 | (tempStack[tempStackPtr] != 0 && tempStack[tempStackPtr - 1] == 0)) |
| 204 | { |
| 205 | delete[] tempStack; |
| 206 | vtkErrorMacro("subtraction expects either 2 vectors or 2 scalars"); |
| 207 | return 0; |
| 208 | } |
| 209 | tempStackPtr--; |
| 210 | break; |
| 211 | case VTK_PARSER_MULTIPLY: |
| 212 | if (tempStack[tempStackPtr - 1] == 0 && tempStack[tempStackPtr] == 1) |
| 213 | { |