Expression to convert string to float (MapServer)

Question

Is it possible to convert a value string into a float in a mapfile? The code is in CLASS / TEXT, so I can use expression.

For example my value is always displaying ".7". I would like to display "0.7". But I can't do "0" + [value], because sometimes, I have "1" and I don't want to show "01".

For now, it seems that a function float() doesn't exist.

I have MapServer 7.

Edit:

I also try ternary operation like:

TEXT (length([value]) = 1 ? [value] : "0"+[value])

But ternary doesn't exist...

Answer 1

The tostring expression should help you. The mapfile

MAP
  SIZE 100 100
  EXTENT 0 0 100 100
  UNITS meters
  IMAGETYPE png
  LAYER
    STATUS DEFAULT
    TYPE POINT
    FEATURE
      POINTS
        50 50
      END
      ITEMS ".7;1"
    END
    PROCESSING "ITEMS=without,with"
    CLASS
      LABEL
        TEXT (tostring([without],"%.2f") + " " + tostring([with],"%.1f"))
      END # LABEL
    END # CLASS
  END # LAYER
END # Map file

produces the following image with Mapserver 7.0.1

See also Mapserver CLASS documentation (http://mapserver.org/mapfile/class.html).