javascript_routes/lib/javascript_routes.rb

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2008-04-17 11:47:13 +02:00
module JavascriptRoutes
JS = File.join(File.dirname(__FILE__), 'javascripts', 'routes.js')
JS_PACKED = File.join(File.dirname(__FILE__), 'javascripts', 'routes-min.js')
JS_AJAX = File.join(File.dirname(__FILE__), 'javascripts', 'routes-ajax.js')
FILENAME = File.join(RAILS_ROOT, 'public', 'javascripts', 'routes.js')
FILENAME_AJAX = File.join(RAILS_ROOT, 'public', 'javascripts', 'routes-ajax.js')
def self.generate(options = {})
options.symbolize_keys!.reverse_merge!(:pack => true)
routes = options[:routes] || ActionController::Routing::Routes.routes.select{|r|
r.conditions[:method].nil? || r.conditions[:method] == :get
}
named_routes = options[:named_routes] || ActionController::Routing::Routes.named_routes.routes.select{|n,r|
r.conditions[:method].nil? || r.conditions[:method] == :get
}
filename = options[:filename] || FILENAME
filename_ajax = options[:filename_ajax] || FILENAME_AJAX
#Will only create simple functions for named routes
if options[:lite]
File.open(filename, 'w') do |file|
routes_object = ' var r = "{'
named_routes.each_with_index do |a,i|
n,r = *a
routes_object << "#{n}: function(#{r.segments.select{|s| s.respond_to?(:key) }.map(&:key).join(', ')}){ "
routes_object << 'return '
r.segments.each_with_index do |s,j|
if s.respond_to?(:key)
routes_object << "'" unless i==0 || r.segments[j-1].respond_to?(:key)
routes_object << "+#{s.key}"
else
routes_object << '+' if j > 0 && r.segments[j-1].respond_to?(:key)
routes_object << "'" if j == 0 || r.segments[j-1].respond_to?(:key)
routes_object << s.to_s unless j != 0 && j == r.segments.size-1 && s.to_s == '/'
routes_object << "'" if j == r.segments.size-1
end
end
routes_object << ';'
routes_object << " }"
routes_object << ',' if i < named_routes.size-1
end
routes_object << "}\";\n"
#Find words with 5 or more characters that appear more than once
words = routes_object.scan(/[a-z_]{5,}/).group_by{|s| s }.inject([]){|r,a| r << a.first if a.last.size > 1; r }
#Replace words with placeholders
words.each_with_index{|w,i| routes_object.gsub!(w, "$#{i}") }
file << "var Routes = (function(){\n"
#Export words to JS
file << " var s = [" + words.map{|w| "'#{w}'" }.join(',') + "];\n"
file << routes_object
#Put the words back in (using JS) and eval the result
file << " return eval('('+r.replace(/\\$(\\d+)/g, function(m,i){ return s[i]; })+')');\n"
file << "})();"
end
#Will create all routes with generation logic (from lib/routes.js)
else
File.open(filename, 'w') do |file|
file << File.read(options[:pack] ? JS_PACKED : JS)
file << "\n\n(function(){\n\n"#Don't pollute the global namespace
#This is ugly, but it works. It builds a JS array
#with an object for each route. Most of the ugliness
#is to reduce the amount of space it takes up.
routes_array = ''
routes_array << 'var r = "['
routes.each_with_index do |r,i|
routes_array << '{'
#Append a name if this is a named route
named_route = named_routes.find{|name,route| route.equal?(r) }
routes_array << "n:'#{named_route.first}'," if named_route
#Append segments as a string with @ between. This will
#be split() using JS.
routes_array << "s:'"
routes_array << r.segments.map do |s|
if s.is_a?(ActionController::Routing::PathSegment)
'*' + s.to_s[1..-1] + (s.is_optional ? 't' : 'f')
else
s.to_s + (s.is_optional ? 't' : 'f')
end
end.join('@')
routes_array << "'"
#Append params object
routes_array << ',r:{'
routes_array << r.requirements.map do |k,v|
"#{k}:'#{v}'"
end.join(',')
routes_array << '}'
routes_array << '}'
routes_array << ',' unless i == routes.size-1
end
routes_array << "]\";\n"
#Find words that occur more than once and are more than 5 characters in length
words = routes_array.scan(/[a-z_]{5,}/).group_by{|s| s }.inject([]){|r,a| r << a.first if a.last.size > 1; r }
#Replace words with placeholders
words.each_with_index{|w,i| routes_array.gsub!(w, "$#{i}") }
#Export words to JS
file << " var s = [" + words.map{|w| "'#{w}'" }.join(',') + "];\n"
file << ' '+routes_array
#Put the words back in (using JS) and eval the result
file << " r = eval('('+r.replace(/\\$(\\d+)/g, function(m,i){ return s[i]; })+')');\n\n"
#Add routes
file << " for (var i = 0; i < r.length; i++) {\n"
file << " var s=[];\n"
file << " var segs=r[i].s.split('@');\n"
file << " for (var j = 0; j < segs.length; j++) {\n"
file << " s.push(Route.S(segs[j].slice(0, -1), segs[j].slice(-1) == 't'));\n"
file << " }\n"
file << " Routes.push(new Route(s, r[i].r, r[i].n));\n"
file << " }\n\n"
file << " Routes.extractNamed();\n\n"
file << "})();"
end
#Add ajax extras
File.open filename_ajax, 'w' do |f|
f.write(File.read(JS_AJAX))
end
end
rescue => e
warn("\n\nCould not write routes.js: \"#{e.class}:#{e.message}\"\n\n")
File.truncate(filename, 0) rescue nil
end
end