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from __future__ import with_statement
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# XXX: for _HTMLPage
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import page
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import templates
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from pages import error404
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import os.path
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import imp
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# the page dir
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PAGE_DIR_PATH = "pages/"
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def build_page_path (*bits) :
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# XXX: fix directory traversal...
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return os.path.join(PAGE_DIR_PATH, *bits)
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class PageLoader (object) :
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"""
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Load Page objects from files under pages/
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"""
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# file extension, e.g. '.html' or '.py'
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suffix = None
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def __init__ (self, suffix) :
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self.suffix = suffix
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def _build_path (self, page_path) :
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"""
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Builds a path from base_path + page_path + suffix. Returns None if the path does not exist
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"""
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path = build_page_path(page_path) + self.suffix
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if os.path.exists(path) :
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return path
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else :
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return None
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def load (self, page_path) :
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"""
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Attempts to load the page at the given path, returns the class on success, None on failure
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"""
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abstract
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class _HTMLPage (page.Page) :
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# the path to the .html file
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file_path = None
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# parent page
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# parent = None
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def __init__ (self, *args) :
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super(_HTMLPage, self).__init__(*args)
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# open the .html and read in the contents
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with open(self.file_path, "r") as fh :
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self.file_data = fh.read()
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def render_template (self) :
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tpl = self._build_template(templates.layout)
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tpl.page_content = self.file_data
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return tpl
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class HTMLLoader (PageLoader) :
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"""
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Static .html files that are inserted into the layout template as-is
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Sub-pages are not supported...
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"""
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def __init__ (self) :
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super(HTMLLoader, self).__init__(".html")
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def get_title (self, page_path) :
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head, tail = os.path.split(page_path)
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return tail.title() if tail else "Index"
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def load (self, _page_path) :
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_file_path = self._build_path(_page_path)
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# ignore if it doesn't exist
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if not _file_path :
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return
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# get page title
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_title = self.get_title(_page_path)
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# create a new class and return it
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class _html_page (_HTMLPage) :
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file_path = _file_path
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title = _title
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name = _title
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path = _page_path
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# return it
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return _html_page
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class PythonLoader (PageLoader) :
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"""
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Dynamic .py files that define a Page class
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"""
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def __init__ (self) :
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super(PythonLoader, self).__init__(".py")
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def load (self, page_path) :
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path = self._build_path(page_path)
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# ignore if not exists
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if not path :
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return
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# load the module dynamically
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module = imp.load_source("__dyn_%d" % id(path), path)
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# return the Page object
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return module.Page
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# our defined loaders
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loaders = [
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HTMLLoader(),
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PythonLoader(),
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]
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def load_page (req) :
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"""
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Returns an instance of a Page object corresponding to the given req
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"""
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# page path is given in req
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page_path = req.page_path
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# if it's a dir, then add 'index'
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if os.path.isdir(build_page_path(page_path)) :
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page_path = os.path.join(page_path, "index")
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# try each loader in turn
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for loader in loaders :
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page = loader.load(req.page_path)
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# found?
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if page :
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break
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# 404 error...
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if not page :
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page = error404.Error404
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return page(req, req.page_path)
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