indextree and thispage

Representing Site Structure

rest2web provides your templates with three variables that give you information about the site structure. The first is called sections. This gives you information about all the pages in the same directory as the one that is being rendered. See the templating page for the description of that data structure.

The other two variables are called indextree and thispage. indextree is a data structure that represents more of the whole site than sections. thispage is a pointer to a specific part of indextree.

Because of the order that sites are processed in, any page can know that every directory above it will have been fully processed. This means that indextree can be used to construct 'sidebar' type links that look a bit like the following :

(root directory)

    index page
        |
        |
    section1
        |       (a sub-directory)
        |
    section 2 - Index Page
        |           |
        |           |
    section 3       |
        |       sub-section 1
        |           |
    section 4   sub-section 2   (another sub-directory)
                    |
                sub-section 3 - Index Page
                                    |
                                    |
                               **This Page**
                                    |
                                Another Page
                                    |
                               And Another One

This allows a sidebar that is a set of links to all the sections above the current page. It doesn't yet allow you to know what pages might be in section 3 or section 4 of the root directory - but it would be unusual to need to put that amount of links just in a sidebar [1] !

You can see an example of using sections for sidebar information in the rest2web docs. The test site is an example of a site using indextree for the sidebar. You can use the standard function sidebar to generate these sidebars from indextree.

The actual data structure indextree is a dictionary that represents the index page for the top level directory. The dictionary contains links to dictionaries that represent the other pages and indexes. indextree is actually just part of the whole tree - it only contains the branches needed to get from the root directory to the current page that is being rendered.

The dictionaries in indextree all follow the same pattern [2] and contain the following members :

  1. parent : a reference to the parent directory (also a dictionary like this).

    If this is the top level directory, then this member is None.

  2. sectionlist : a list of sections for this directory. This retains the order that the sections are listed in the sectionlist value of the restindex.

  3. sections : this is actually a dictionary keyed by section name. Each value is a tuple (section_title, section_description)

  4. pages : a list of pages that are in this section. For pages that don't represent subsections this will be the value None. For pages that do represent subsections, this list will only be populated if our page is somewhere down this tree.

    If the page currently being rendered (thispage) is not further down this branch, then this will be an empty list [].

    Each page in this list is also a dictionary like this one.

  5. subdir : This will be True for pages that are index pages (i.e. represent sub-directories). It is False for pages that aren't index pages for sections.

  6. target : A relative link from the current page to the one that this dictionary represents.

  7. section : What section this page is in. For an index page, this section will refer to what section in the directory above this index belongs to.

  8. link-title

  9. crumb

  10. page-description

  11. thispage : True if this page represents the one currently being rendered, False otherwise.

As well as indextree, templates also have access to a value called thispage. thispage is an entry in the indextree structure, but it points to the current page. If you like indextree is the top of the tree, and thispage is the bottom.

Note

Pages that have 'include' set to 'No' aren't in indextree. For those pages the value thispage will be None.

All string values in the indextree structure are encoded using the appropriate encoding for the page being rendered (as determined by the value final_encoding).

[1]It would be possible to do this by generating the site in two passes. On the first pass we'd generate the link structure and on the second pass actually render the pages. This would take longer, mean keeping the whole site in memory, and mean parsing the whole site before basic errors in the template are discovered !
[2]They follow as closely as possible the pattern for pages in the sections variable that is also passed to templates. See sections in the templating page.

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Part of the rest2web Docs
Page last modified Sat Jun 25 19:11:57 2005.

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