from types import StringTypes, ListType
+from django.template.loader import render_to_string
+
+debug=True
+
class Prelude:
"""A class for collecting dependencies on js/css files or fragments"""
keys=[ 'js_files','css_files','js_chunks', 'css_chunks' ]
- def __init__ (self):
+ def __init__ (self, js_files=None, css_files=None, js_chunks=None, css_chunks=None):
# it's tempting to use sets but sets are not ordered..
- self.js_files =[]
- self.css_files =[]
- self.js_chunks =[]
- self.css_chunks=[]
+ self.js_files = Prelude._normalize(js_files)
+ self.css_files = Prelude._normalize(css_files)
+ self.js_chunks = Prelude._normalize(js_chunks)
+ self.css_chunks= Prelude._normalize(css_chunks)
@staticmethod
def _normalize (input):
- if isinstance (input, ListType): return input
+ if not input: return []
+ elif isinstance (input, ListType): return input
elif isinstance (input, StringTypes): return [ input ]
else: return list (input)
def add_css_chunks (self, x):
self.css_chunks += Prelude._normalize (x)
- def render_env (self):
+ def inspect_string (self,msg):
+ result = 'Prelude.inspect %s (%s) with '%(msg,self)
+ result += ",".join( [ "%s->%s"%(k,len(getattr(self,k))) for k in ['js_files','js_chunks','css_files','css_chunks'] ] )
+ return result
+ def inspect (self,msg):
+ print self.inspect_string(msg)
+
+ # first attempt was to use a simple dict like this
+ # env={}
+ # env['js_files']= self.js_files
+ # env['css_files']= self.css_files
+ # env['js_chunks']= '\n'.join(self.js_chunks)
+ # env['css_chunks']='\n'.join(self.css_chunks)
+ # return env
+ # together with this in layout-myslice.html
+ # {% for js_file in js_files %} {% insert_str prelude js_file %} {% endfor %}
+ # {% for css_file in css_files %} {% insert_str prelude css_file %} {% endfor %}
+ # somehow however this would not work too well,
+ # probably insert_above is not powerful enough to handle that
+ #
+ # so a much simpler and safer approach is for use to compute the html header directly
+ def template_env (self):
env={}
env['js_files']= self.js_files
env['css_files']= self.css_files
- env['js_chunks']= '\n'.join(self.js_chunks)
- env['css_chunks']='\n'.join(self.css_chunks)
- return env
+ env['js_chunks']= self.js_chunks
+ env['css_chunks']=self.css_chunks
+ # not sure how this should be done more cleanly
+ from myslice.settings import STATIC_URL
+ env ['STATIC_URL'] = STATIC_URL
+ # render this with prelude.html and put the result in header_prelude
+ header_prelude = render_to_string ('header-prelude.html',env)
+ return { 'header_prelude' : header_prelude }