On Thu, Nov 03, 2011 at 05:31:04PM +0100, Torsten Leistikow wrote:
- How can I check the first character of the value in a style file? (I want to detect whether the first character is a minus sign "-".)
- How can I check the last character of the value in a style file? (incline allows either "%" or "°")
You need the ~ (regexp match) operator for this. I am not sure if the mkgmap regexps have an implicit match-at-start ^ at front and match-at-end $ at end. If they do, then you can do this: incline ~ '-.*' incline ~ '.*(%|°)' If not, these should work: incline ~ '^-.*' incline ~ '.*(%|°)$' You can of course combine these two: incline ~ '^-.*(%|°)' this should match only negative inclines that end in % or °
How can I remove the first character of the value in a style file? ("-5%" -> "5%")
Sorry, this I do not know. There is a substring filter, which might do the trick here (when you only want to remove a fixed number of characters at the front). It works something like this: { name '${incline|substr:1}' } (I am not sure about the exact syntax)
- How can I check, whether a character is numeric? (in [0..9])
incline ~ '^-?[1-9][0-9]*(%|°)$' should match anything that optionally starts with -, is followed by a digit 1 to 9 and then by any number (including zero) of digits 0 to 9, and finally ending in % or °. I hope that this helps. Marko