currentToken - The token value.

currentIndex - The token index value.

Returns

true if the token is a Unit; otherwise, false.

Syntax

Parses a token into the Unit Property.

Remarks

Decrements currentIndex by one if the token is a non-range Unit.
Decrements currentIndex by two if the token is a range Unit.

The vertical bar indicates the Current Token Index.

1. Check for UnitNumber with unspecified UnitType.
  If the current token starts with "#" it is a UnitNumber for an unspecified UnitType.
  The UnitNumber property is set to the value following the "#" and the UnitType
  property is set to "#".
                                |
  Before: 123 Main Street North #3

  UnitType = "#", UnitNumber = "3".

  If the Unit values are found, then the current token index is decremented and the
  Unit Parsing ends.
                         |
  After: 123 Main Street North #3

2. Check for UnitType that does not require a UnitNumber(Range).
  If the current token is a UnitType that does not require a UnitNumber(Range), then
  the UnitType property is set to the current token value.
                          |
  Before: 123 Main Street Front

  UnitType = "Front", UnitNumber = null.

  If the Unit values are found, then the current token index is decremented and the
  Unit Parsing ends.
                  |
  After: 123 Main Street Front

3. Check for preceding token UnitType of "#".
  If the preceding token is "#" then the UnitNumber property is set to the current
  token value and the UnitType property is set to "#" value.
                            |
  Before: 123 Main Street # 3

  UnitType = "#", UnitNumber = "3".

  If the Unit values are found, then the current token index is decremented by 2
  and the Unit Parsing ends.
                  |
  After: 123 Main Street # 3

4. Check for preceding token UnitType.
  If the preceding token is a UnitType, then the UnitType property is set to the
  preceding token and the UnitNumber property is set to the current token.
                                    |
  Before: 123 Main Street Apartment 3
  
  UnitType = "APT", UnitNumber = "3"

  If the Unit values are found, then the current token index is decremented by 2.
                  |
  After: 123 Main Street Apartment 3