On 22.06.2014 19:02, Steve Ratcliffe wrote:
Hi Felix
well the regex commands are a bit too difficult to understand for me. So I would need some practical help.. So I have the following a)Key="420 m" b)Key="420m" c)Key="420" d)Key="420ft"
I want it to return number only in Key3, and number plus uni in Key2. I assume if no unit is given in value, value is "m"
so I would like to end up with a)Key2=420m and Key3=420 b)Key2=420m and Key3=420 c)Key2=420m and Key3=420 d)Key2=420ft and Key3=128.016
The only supported conversion is m=>ft, I think because our contours are always in feet, so I am changing the question to match so it can be tested. We can easily add the reverse convertion.
okay - I would have thought reverse is also implemented.
The following will work with the given values:
Key=* { set key2='${Key|subst:"[ \t]*~>" | subst:"(?<=[0-9]+)$~>m"}'; set key3='${Key|subst:"[a-zA-Z \t]+~>"}'; }
key2 ~ '.*m' { set key3='${key3|conv:"m=>ft"}'; }
In words this: 1. First remove all spaces and tabs and set key2 2. if a digit is at the end of key2, append a 'm' 3. remove all letters and spaces from original Key and set as key3 4. if key2 ends in 'm', then apply conversion meters to feet on key3 wow - that's complicated. Well thanks I think I can use it and will try to understand/decipher how it's written tomorrow..
With the attached StyleTester file, I get the results:
WAY 1: Line 0x2, labels=[key2=420m key3=1378, null, null, null], res=24-24 (1/1),(2/2),
WAY 2: Line 0x2, labels=[key2=420m key3=1378, null, null, null], res=24-24 (1/1),(2/2),
WAY 3: Line 0x2, labels=[key2=420m key3=1378, null, null, null], res=24-24 (1/1),(2/2),
WAY 4: Line 0x2, labels=[key2=420ft key3=420 , null, null, null], res=24-24 (1/1),(2/2),
Using regular expressions will probably lead to more problems though. It might fail on other strings we havn't considered for example.
Perhaps a units filter that takes two arguments: a default unit when none is specified, and the target unit.
Well something similar to the maxspeedkmh() would be quite nice and easier (yes I know there is length() - but in this case I rather intended to use it for ele key.) I would guess that a filter KEYlengthinmeters() would be similar in code to maxspeedkmh() function, Thanks a lot, Felix
..Steve
-- keep on biking and discovering new trails Felix openmtbmap.org & www.velomap.org