Question

I am trying to make a small sinatra example that will print a calendar view for either a month, day or year depending on the URL. Such that

localhost:4567/calendar/2012 will print a year view calendar

localhost:4567/calendar/2012/9 will print a month calendar

localhost:4567/calendar/2012/9/15 will print a day view calendar

I have this working as this:

require 'sinatra'

get '/calendar/:year/:month/:day/?' do
    "printing daily calendar for #{params[:year]}/#{params[:month]}/#{params[:day]}"
end

get '/calendar/:year/:month/?' do
    "printing monthly calendar for #{params[:year]}/#{params[:month]}"
end

get '/calendar/:year/?' do
    "printing yearly calendar for #{params[:year]}"
end

My question is, can I further refine those routes with some kind of RegEx so that I can say the url only counts if the :month portion is between 1 and 12 and the :day portion is between 1 and 31?

Answer 1

Yes. You can specify regex in sinatra routing condition. See sinatra readme for more information.

get %r{/calendar/([\d]+)/(1[0-2]|0?[1-9])/([12][0-9]|3[0-1]|0?[1-9])$} do 
  "hello #{params[:captures]}"
end

get %r{/calendar/([\d]+)/(1[0-2]|0?[1-9])$} do 
  "hello #{params[:captures]}"        
end

# host/2012/11 will print "hello [2012, 11]"
# params[:captures] will return an array containing what match the regular expressions