YUI Loader as Django middleware

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---- middleware.py

import re

from django.conf import settings

from module_info_2_5_1 import MODULE_INFO
from components import Components


DEFAULT_BASE = 'http://yui.yahooapis.com/2.5.1/build/'
DEFAULT_JS_TAG = '<script type="text/javascript" src="%s"></script>'
DEFAULT_CSS_TAG = '<link rel="stylesheet" type="text/css" href="%s" />'

YUI_BASE = getattr(settings, 'YUI_INCLUDE_BASE', DEFAULT_BASE)
PREFIX_RE = getattr(settings, 'YUI_INCLUDE_PREFIX_RE', '<!-- *YUI_')
SUFFIX_RE = getattr(settings, 'YUI_INCLUDE_SUFFIX_RE', ' *-->')
TAGS = {'js': getattr(settings, 'YUI_INCLUDE_JS_TAG', DEFAULT_JS_TAG),
        'css': getattr(settings, 'YUI_INCLUDE_CSS_TAG', DEFAULT_CSS_TAG)}
VERSIONS = {'raw': '', '': '', 'min': '-min', 'debug': '-debug'}

COMPONENTS = Components(MODULE_INFO)


class YUILoader:

    def __init__(self):
        self._components = set()
        self._rolled_up_components = {}
        self._rollup_counters = {}
        self.set_version('min')

    def set_version(self, version):
        self._version = VERSIONS[version]

    def add_component(self, new_component_name):
        if not self._has_component(new_component_name):
            self._add_requirements(new_component_name)
            self._count_in_rollups(new_component_name)
            rollup_name = self._get_satisfied_rollup(new_component_name)
            if rollup_name:
                self.add_component(rollup_name)
            else:
                self._components.add(new_component_name)
                self._roll_up_superseded(new_component_name)

    def render(self):
        return '\n'.join(self._render_component(component)
                         for component in self._sort_components())

    def _has_component(self, component_name):
        return component_name in self._components \
               or component_name in self._rolled_up_components

    def _get_satisfied_rollup(self, component_name):
        if self._version == '-min':
            for rollup_name in COMPONENTS.get_rollups(component_name):
                rollup_status = self._rollup_counters.get(rollup_name, set())
                if len(rollup_status) >= COMPONENTS[rollup_name].rollup:
                    return rollup_name

    def _count_in_rollups(self, component_name):
        for rollup_name in COMPONENTS.get_rollups(component_name):
            rolled_up = self._rollup_counters.setdefault(rollup_name, set())
            rolled_up.add(component_name)
        for superseded in COMPONENTS[component_name].supersedes:
            self._count_in_rollups(superseded)

    def _roll_up_superseded(self, component_name):
        for superseded in COMPONENTS[component_name].supersedes:
            self._rolled_up_components[superseded] = component_name
            if superseded in self._components:
                self._components.remove(superseded)

    def _add_requirements(self, component_name):
        for requirement in COMPONENTS[component_name].requires:
            self.add_component(requirement)

    def _render_component(self, component_name):
        component = COMPONENTS[component_name]
        path = component.path
        if component.type == 'js':
            if self._version != '-min' and path.endswith('-min.js'):
                path = path[:-7] + self._version + '.js'
        elif component.type == 'css':
            if self._version == '' and path.endswith('-min.css'):
                path = path[:-8] + '.css'
        return TAGS[component.type] % (YUI_BASE + path,)

    def _sort_components(self, component_names=None):
        if component_names is None:
            comps = self._components.copy()
        else:
            comps = component_names
        while comps:
            component_name = comps.pop()
            component = COMPONENTS[component_name]
            direct_deps = component.requires + component.after
            indirect_deps = [
                self._rolled_up_components[r] for r in direct_deps
                if r in self._rolled_up_components]
            all_deps = set(direct_deps).union(set(indirect_deps))
            deps_left = comps.intersection(all_deps)
            for r in self._sort_components(deps_left):
                yield r
                comps.remove(r)
            yield component_name


YUI_RE = re.compile(
    r'%s(include|version) +(.*?)%s' % (PREFIX_RE, SUFFIX_RE))
YUI_INIT_RE = re.compile(
    '%sinit%s' % (PREFIX_RE, SUFFIX_RE))

class YUIIncludeMiddleware(object):
    def process_response(self, request, response):
        components = set()
        node = YUILoader()
        def collect(match):
            cmd, data = match.groups()
            if cmd == 'include':
                components.update(data.split())
            elif cmd == 'version':
                node.set_version(data)
            else:
                return '<!-- UNKNOWN COMMAND YUI_%s -->' % cmd
            return ''
        content = YUI_RE.sub(collect, response.content)
        for component in components:
            node.add_component(component)
        content = YUI_INIT_RE.sub(node.render(), content, 1)
        response.content = YUI_INIT_RE.sub(
            '<!-- WARNING: MULTIPLE YUI_init STATEMENTS -->', content)
        return response


---- components.py

class ComponentAdapter:

    def __init__(self, components, name, data):
        self.components = components
        self.name = name
        self.data = data

    @property
    def supersedes(self):
        return self.data.get('supersedes', [])

    @property
    def requires(self):
        r = self.data.get('requires', [])

        if self.type != 'js' \
        or self.name == 'yahoo' \
        or 'yahoo' in self.supersedes \
        or 'yahoo' in r:
            return r
        else:
            return ['yahoo'] + r

    @property
    def after(self):
        if self.type == 'css':
            return self.data.get('after', [])
        elif self.type == 'js':
            return self.data.get('after', []) + \
                   self.components.get_css_components()

    @property
    def rollup(self):
        return self.data.get('rollup', 1)

    def __getattr__(self, attname):
        return self.data[attname]


class Components(dict):
    def __init__(self, components_dict):
        super(Components, self).__init__(components_dict)
        self.rollup_mapping = {}
        for component_name, data in components_dict.items():
            self.rollup_mapping.setdefault(component_name, set())
            if 'rollup' not in data:
                continue
            for rolled_up in data['supersedes']:
                self.rollup_mapping.setdefault(rolled_up, set()).add(
                    component_name)

    def __getitem__(self, component_name):
        data = super(Components, self).__getitem__(component_name)
        return ComponentAdapter(self, component_name, data)

    def get_rollups(self, component_name):
        return self.rollup_mapping[component_name]

    def get_all_rollups(self, component_name):
        rollups = self.get_rollups(component_name)
        for superseded in self[component_name].supersedes:
            rollups.update(self.get_all_rollups(superseded))
        return rollups

    def get_css_components(self):
        return [name for name, data in self.items()
                if data['type'] == 'css']


---- module_info_2_5_1.py

MODULE_INFO = {
    'animation': {'path': 'animation/animation-min.js',
                  'requires': ['dom', 'event'],
                  'type': 'js'},
    'autocomplete': {'optional': ['connection', 'animation'],
                     'path': 'autocomplete/autocomplete-min.js',
                     'requires': ['dom', 'event'],
                     'skinnable': True,
                     'type': 'js'},
    'base': {'after': ['reset', 'fonts', 'grids'],
             'path': 'base/base-min.css',
             'type': 'css'},
    'button': {'optional': ['menu'],
               'path': 'button/button-min.js',
               'requires': ['element'],
               'skinnable': True,
               'type': 'js'},
    'calendar': {'path': 'calendar/calendar-min.js',
                 'requires': ['event', 'dom'],
                 'skinnable': True,
                 'type': 'js'},
    'charts': {'path': 'charts/charts-experimental-min.js',
               'requires': ['element', 'json', 'datasource'],
               'type': 'js'},
    'colorpicker': {'optional': ['animation'],
                    'path': 'colorpicker/colorpicker-min.js',
                    'requires': ['slider', 'element'],
                    'skinnable': True,
                    'type': 'js'},
    'connection': {'path': 'connection/connection-min.js',
                   'requires': ['event'],
                   'type': 'js'},
    'container': {'optional': ['dragdrop', 'animation', 'connection'],
                  'path': 'container/container-min.js',
                  'requires': ['dom', 'event'],
                  'skinnable': True,
                  'supersedes': ['containercore'],
                  'type': 'js'},
    'containercore': {'path': 'container/container_core-min.js',
                      'pkg': 'container',
                      'requires': ['dom', 'event'],
                      'type': 'js'},
    'cookie': {'path': 'cookie/cookie-beta-min.js',
               'requires': ['yahoo'],
               'type': 'js'},
    'datasource': {'optional': ['connection'],
                   'path': 'datasource/datasource-beta-min.js',
                   'requires': ['event'],
                   'type': 'js'},
    'datatable': {'optional': ['calendar', 'dragdrop'],
                  'path': 'datatable/datatable-beta-min.js',
                  'requires': ['element', 'datasource'],
                  'skinnable': True,
                  'type': 'js'},
    'dom': {'path': 'dom/dom-min.js', 'requires': ['yahoo'], 'type': 'js'},
    'dragdrop': {'path': 'dragdrop/dragdrop-min.js',
                 'requires': ['dom', 'event'],
                 'type': 'js'},
    'editor': {'optional': ['animation', 'dragdrop'],
               'path': 'editor/editor-beta-min.js',
               'requires': ['menu', 'element', 'button'],
               'skinnable': True,
               'type': 'js'},
    'element': {'path': 'element/element-beta-min.js',
                'requires': ['dom', 'event'],
                'type': 'js'},
    'event': {'path': 'event/event-min.js',
              'requires': ['yahoo'],
              'type': 'js'},
    'fonts': {'path': 'fonts/fonts-min.css', 'type': 'css'},
    'get': {'path': 'get/get-min.js', 'requires': ['yahoo'], 'type': 'js'},
    'grids': {'optional': ['reset'],
              'path': 'grids/grids-min.css',
              'requires': ['fonts'],
              'type': 'css'},
    'history': {'path': 'history/history-min.js',
                'requires': ['event'],
                'type': 'js'},
    'imagecropper': {'path': 'imagecropper/imagecropper-beta-min.js',
                     'requires': ['dom',
                                  'event',
                                  'dragdrop',
                                  'element',
                                  'resize'],
                     'skinnable': True,
                     'type': 'js'},
    'imageloader': {'path': 'imageloader/imageloader-min.js',
                    'requires': ['event', 'dom'],
                    'type': 'js'},
    'json': {'path': 'json/json-min.js',
             'requires': ['yahoo'],
             'type': 'js'},
    'layout': {'optional': ['animation', 'dragdrop', 'resize', 'selector'],
               'path': 'layout/layout-beta-min.js',
               'requires': ['dom', 'event', 'element'],
               'skinnable': True,
               'type': 'js'},
    'logger': {'optional': ['dragdrop'],
               'path': 'logger/logger-min.js',
               'requires': ['event', 'dom'],
               'skinnable': True,
               'type': 'js'},
    'menu': {'path': 'menu/menu-min.js',
             'requires': ['containercore'],
             'skinnable': True,
             'type': 'js'},
    'profiler': {'path': 'profiler/profiler-beta-min.js',
                 'requires': ['yahoo'],
                 'type': 'js'},
    'profilerviewer': {'path': 'profilerviewer/profilerviewer-beta-min.js',



                       'requires': ['profiler', 'yuiloader', 'element'],
                       'skinnable': True,
                       'type': 'js'},
    'reset': {'path': 'reset/reset-min.css', 'type': 'css'},
    'reset-fonts': {'path': 'reset-fonts/reset-fonts.css',
                    'rollup': 2,
                    'supersedes': ['reset', 'fonts'],
                    'type': 'css'},
    'reset-fonts-grids': {'path': 'reset-fonts-grids/reset-fonts-grids.css',
                          'rollup': 4,
                          'supersedes': ['reset',
                                         'fonts',
                                         'grids',
                                         'reset-fonts'],
                          'type': 'css'},
    'resize': {'optional': ['animation'],
               'path': 'resize/resize-beta-min.js',
               'requires': ['dom', 'event', 'dragdrop', 'element'],
               'skinnable': True,
               'type': 'js'},
    'selector': {'path': 'selector/selector-beta-min.js',
                 'requires': ['yahoo', 'dom'],
                 'type': 'js'},
    'simpleeditor': {'optional': ['containercore',
                                  'menu',
                                  'button',
                                  'animation',
                                  'dragdrop'],
                     'path': 'editor/simpleeditor-beta-min.js',
                     'pkg': 'editor',
                     'requires': ['element'],
                     'skinnable': True,
                     'type': 'js'},
    'slider': {'optional': ['animation'],
               'path': 'slider/slider-min.js',
               'requires': ['dragdrop'],
               'type': 'js'},
    'tabview': {'optional': ['connection'],
                'path': 'tabview/tabview-min.js',
                'requires': ['element'],
                'skinnable': True,
                'type': 'js'},
    'treeview': {'path': 'treeview/treeview-min.js',
                 'requires': ['event'],
                 'skinnable': True,
                 'type': 'js'},
    'uploader': {'path': 'uploader/uploader-experimental.js',
                 'requires': ['yahoo', 'element'],
                 'type': 'js'},
    'utilities': {'path': 'utilities/utilities.js',
                  'rollup': 8,
                  'supersedes': ['yahoo',
                                 'event',
                                 'dragdrop',
                                 'animation',
                                 'dom',
                                 'connection',
                                 'element',
                                 'yahoo-dom-event',
                                 'get',
                                 'yuiloader',
                                 'yuiloader-dom-event'],
                  'type': 'js'},
    'yahoo': {'path': 'yahoo/yahoo-min.js', 'type': 'js'},
    'yahoo-dom-event': {'path': 'yahoo-dom-event/yahoo-dom-event.js',
                        'rollup': 3,
                        'supersedes': ['yahoo', 'event', 'dom'],
                        'type': 'js'},
    'yuiloader': {'path': 'yuiloader/yuiloader-beta-min.js',
                  'supersedes': ['yahoo', 'get'],
                  'type': 'js'},
    'yuiloader-dom-event': {'path': 'yuiloader-dom-event/yuiloader-dom-event.js',
                            'rollup': 5,
                            'supersedes': ['yahoo',
                                           'dom',
                                           'event',
                                           'get',
                                           'yuiloader',
                                           'yahoo-dom-event'],
                            'type': 'js'},
    'yuitest': {'path': 'yuitest/yuitest-min.js',
                'requires': ['logger'],
                'skinnable': True,
                'type': 'js'}}

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Comments

shadfc (on August 29, 2008):

This is really cool, but it doesnt seem to include any of the css dependencies on some of the controls such as autocomplete and calendar.

Hopefully someone can retool it to do this and updated it to YUI 2.5.2

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