public function UnitsEntity::inverseDecompose in Units of Measurement 7.2

Create inverse decomposition mathematical expression.

Return value

UnitsMathematicalExpression Inverse decomposition mathematical expression

File

includes/UnitsEntity.class.inc, line 99

Definition of UnitsEntity class.

Class

UnitsEntity

Units of measurement entity class.

Code

public function inverseDecompose() {
  $decomposition = $this
    ->decompose();
  if (!$this
    ->isLinear()) {
    $straight_decomposition = $decomposition;
    $decomposition = new UnitsConstantMathematicalExpression(UNITS_QUANTITY);
    while (get_class($straight_decomposition) == 'UnitsMathematicalOperatorLinear') {
      $operand1 = $straight_decomposition
        ->operand1();
      $operand2 = $straight_decomposition
        ->operand2();
      $operand_to_isolate = strpos($operand1
        ->toPostfix(), UNITS_QUANTITY) !== FALSE ? 1 : 2;
      $decomposition = $straight_decomposition
        ->isolateOperand($decomposition, $operand_to_isolate);
      $straight_decomposition = $operand_to_isolate == 1 ? $operand1 : $operand2;
    }
  }
  return $decomposition;
}