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
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