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pyramid_describe 0.4.0

A pyramid plugin that describes a pyramid application URL hierarchy via inspection.

Latest Version: 0.4.5

A Pyramid plugin that makes a Pyramid application self-documenting via inspection/reflection to:

  1. Describe the application URL structure,
  2. Extract documentation from Python comments, and
  3. Generate formal syntax using commenting conventions.

The resulting documentation can be served by the application to an HTTP request or displayed on the command line. It has built-in support for plain-text hierachies, reStructuredText, HTML, PDF, JSON, YAML, WADL, and XML, however other custom formats can be added easily.

Exposing an application’s structure via HTTP is useful to dynamically generate an API description (via WADL, JSON, or YAML) or to create documentation directly from source code.

On the command-line it is useful to get visibility into an application’s URL structure and hierarchy so that it can be understood and maintained.


Although pyramid-describe is intended to be able to describe any kind of pyramid application, currently it only supports pyramid-controllers based dispatch.


Currently, pyramid-describe can only inspect the first Controller it finds – this will eventually be fixed to correctly implement the inspect option.



$ pip install pyramid-describe

Command-line example:

$ pdescribe example.ini --format txt
/                       # The application root.
├── contact/            # Contact manager.
│   ├── <POST>          # Creates a new 'contact' object.
│   └── {CONTACTID}     # RESTful access to a specific contact.
│       ├── <DELETE>    # Delete this contact.
│       ├── <GET>       # Get this contact's details.
│       └── <PUT>       # Update this contact's details.
├── login               # Authenticate against the server.
└── logout              # Remove authentication tokens.

Examples of the above application in all other formats with built-in support are available at: text (pure-ASCII), reStructuredText, HTML, PDF, JSON, YAML, WADL, and XML.

Enable the plugin:

def main(global_config, **settings):
  # ...
  # ...

And make the documentation available publicly at “/describe”:

describe.attach                          = /describe
describe.formats                         = html pdf
describe.format.html.default.cssPath     = myapp:style/doc-html.css
describe.format.html+pdf.default.cssPath = myapp:style/doc-pdf.css
describe.format.default.pdfkit.options   = {page-size: Letter}

Note that there are many options to control how the resulting documentation is made available – see Options.


Install with the usual python mechanism, e.g. here with pip:

$ pip install pyramid-describe


There are three mechanisms to use pyramid-describe: via standard pyramid inclusion which will add routes to the current application, by explicitly embedding a pyramid_describe.DescribeController instance, or by directly calling the pyramid_describe.Describer object methods.

Pyramid Inclusion

Pyramid-describe can be added via standard pyramid inclusion, either in the INI file or directly in your main function. For example:

def main(global_config, **settings):
  # ...

When using pyramid inclusion, pyramid-describe expects to find configuration options in the application settings. See the Options section for a list of all supported options, with a short example here:


describe.attach                        = /doc
describe.formats                       = html json pdf
describe.format.default.title          = My Application
describe.format.html.default.cssPath   = myapp:static/doc.css
describe.entries.filters               = myapp.describe.entry_filter

Note that multiple describers, each with different configurations, can be added via pyramid inclusion by using the describe.prefixes option.


Pyramid-describe can also be added to your application by embedding a DescribeController object. The DescribeController constructor takes the following parameters:


An instance of pyramid.interfaces.IView, which is the view that should be inspected and reflected.


The root path to the specified URL, so that host-relative URLs can be generated to the views found.


A dictionary of all the options to apply to this describer. Note that in this case, the options should not have any prefix.


from pyramid_describe import DescribeController

def main(global_config, **settings):
  # ...

  settings = {
    'formats'                       : ['html', 'json', 'pdf'],
    'format.default.title'          : 'My Application',
    'format.html.default.cssPath'   : 'myapp:static/doc.css',
    'entries.filters'               : 'myapp.describe.entry_filter',

  config.add_controller('MyAppDescriber', '/doc', DescribeController(settings))


Pyramid-describe can also be added to your application by directly calling the Describer’s functionality. This is an even lower-level approach than, but still quite similar to, embedding the DescribeController; the constructor takes the same settings parameter as the DescribeController, and then a call to the describe method actually generates the output. The describe method takes as parameters a context and a format, and returns a dictionary with the following attributes:


The MIME content-type associated with the rendered output.


The character set that the output is encoded in.


The actual rendering output.


from pyramid_describe import Describer

def my_describer(request):

  settings = {
    'formats'                       : ['html', 'json', 'pdf'],
    'format.default.title'          : 'My Application',
    'format.html.default.cssPath'   : 'myapp:static/doc.css',
    'entries.filters'               : 'myapp.describe.entry_filter',

  describer = Describer(settings=settings)
  context   = dict(request=request)
  result    = describer.describe(context=context, format='pdf')

  request.response.content_type = result['content_type']
  request.response.charset      = result['charset']
  request.response.body         = result['content']

  return request.response

Documentation Conventions

By default, the documentation that is extracted from your handlers’ pydocs is parsed and converted using:

  • Docorator extraction
  • Common text-role definitions
  • Field-list aliasing of numpydoc sections
  • Numpydoc parsing
  • Inter-endpoint linking and referencing

This behavior can be disabled or extended by setting the entries.parsers setting (see Options). Here is an example that employs each of these functions (see below for an in-depth explanation):

class MyController(RestController):

  def deactivate(self, request):
    @PUBLIC, @DEPRECATED(1.3.23)

    The current object is deleted. Please note that this endpoint is
    deprecated; please use the more RESTful`DELETE:..`
    endpoint instead.

    @INTERNAL: OOPS! This method was accidentally carried over from
    the Java implementation. The `soap-to-rest` tool needs to be
    analyzed to figure out why this happened.


  def get(self, request):

  def delete(self, request):

    The current object is deleted.


    recursive : bool, optional, default: false

      If true, recursively deletes any dependent objects too.

    permanent : bool, optional, default: false, @INTERNAL

      If true, the objects and all records are permanently purged
      from the network. Reserved for internal administrators.



      The object(s) were successfully deleted.



      The current user does not have sufficient privileges.


      The specified object does not exist.

Docorator Extraction

Docorators are decorators for documentation. For example, you may decorate a particular endpoint with @BETA to declare that this endpoint is not finalized yet.

Pyramid-describe will inspect an entry’s .doc text and convert them to class names. The class names are applied to different element levels depending on where they are found:

  • Docorators on the first line apply to the entire entry.
  • Docorators at the beginning of a paragraph apply to that paragraph only.
  • Docorators at the beginning of a section title apply to that section.
  • Docorators in the numpydoc type specification apply to that parameter/return/raise or other formal numpydoc object.

Docorators must follow one of the following syntaxes:

  • Simple tag style: @TAG, where TAG can be any alphanumeric sequence.
  • Parameterized declaration style: @TAG(PARAMS), where TAG can be any alphanumeric sequence, and PARAMS can be anything except the closing parenthesis.

Docorators are converted to class names using the following rules:

  • Prefixed with doc-.
  • All letters are lowercased.
  • All non-alphanumeric characters are replaced with a dash (“-“).
  • Consecutive dashes are replaced with one dash.
  • Terminating dashes are dropped.

Thus the docorator @DEPRECATED(1.3.23) becomes doc-deprecated-1-3-23.

IMPORTANT: pyramid-describe does not apply any special processing to docorators beyond identifying them and applying the class names to the appropriate content. It is therefore up to the calling application to filter these in any way, for example hiding entries (or portions thereof) that have the doc-internal, i.e. that were marked with @INTERNAL.

Common Text-Role Definitions

The text-roles class, meth, and func are not by default defined by docutils. Pyramid-describe gives a very bare-bones implementation (it just aliases them as “literal” style nodes). If these text-roles are used by the calling application, a more thorough implementation (that actually performs linking to API documentation) is probably desirable. Pyramid-describe does not have access to this information and is therefore outside of its scope.

Field List Aliasing of Sections

All of the section headers that are specially processed by numpydoc can also be specified as lone “field list” elements. For example, the following two declarations are treated identically:

def function_name(self, request):

  This endpoint does not take any parameters.
def function_name(self, request):

  This endpoint does not take any parameters.

The list of supported headers is extracted at runtime from numpydoc.docscrape.NumpyDocString()._parsed_data.keys().


By default, the pydoc text is parsed by numpydoc, and the Parameters, Other Parameters, Returns, and Raises sections are extracted and converted into formal structured properties of the entry. See numpydoc for format and syntax details.

Inter-Endpoint Linking

Pyramid-describe allows for entry documentation to refer and link to other endpoint documentation. Specifically, the following text-roles are provided:


    Links to the specified endpoint. If METHOD is specified, then the link points directly to that HTTP method. PATH can be either absolute (i.e. starting with a slash /) or relative (i.e. starting with either ./ or ../). Note that unlike “href” syntax, ./ refers to the current endpoint, not the current endpoint’s parent. Some examples, assuming the current endpoint is /foo/bar:

    •\`GET:/index\`: links to the GET method of “/index”
    •\`PUT:.\`: links to the PUT method of “/foo/bar”
    •\`POST:./zog\`: links to the POST method of “/foo/bar/zog”
    •\`POST:../zog\`: links to the POST method of “/foo/zog”
  • :doc.copy:\`[METHOD:]PATH[:SECTION]\`:

    Inlines the specified remote endpoint’s documentation here. The METHOD and PATH apply as for\`...\`. The optional SECTION parameter is a comma-separated list of which sections to inline – if not specified or empty, the entire endpoint’s documentation is inlined; if the wildcard *, then all named sections are inlined, but not the main description.

    Note that section referencing will only work correctly if the entries are decorated with the parsed sections. This is one of the things that numpydoc-style parsing does when enabled (so don’t disable it! :-).

  • :doc.import:\`ASSET-SPEC\`:

    Inlines the specified asset, which is loaded using either pkg_resources or python import. When using pkg_resources, the spec must be in the format [PACKAGE:]PATH. If the PACKAGE is omitted, then the PATH is taken to be relative to the current module.

    If the asset cannot be loaded using pkg_resources, a standard python import is tried. If this succeeds, it is either called (if callable) with no arguments or cast to a string with str(symbol).


The configuration of pyramid-describe is done by setting any of the following options. Note that if specified in the application settings (i.e. the INI file), then they must be prefixed with (by default) describe.. Otherwise, when passing a dictionary of settings to the constructors, the prefix is left off. The following options exist:

  • describe.prefixes : list(str), default: ‘describe’

    Defines the prefix or the list of prefixes that pyramid-describe settings will be searched for in the configuration. For each prefix, a separate DescribeController will be created and attached to the application router. The following example attaches two controllers at /desc-one and /desc-two:

    describe.prefixes = describe-one describe-two
    describe-one.attach  = /desc-one
    # other `describe-one` options...
    describe-two.attach  = /desc-two
    # other `describe-two` options...
  • describe.class : resolve-spec, default: pyramid_describe.DescribeController

    Sets the global default Controller class that will be instantiated for each of the stanzas defined in describe.prefixes. Note that this option can be overriden on a per-stanza basis.

  • {PREFIX}.class : resolve-spec, default: describe.class

    Sets the Controller class that will be instantiated for this PREFIX stanza, overriding describe.class.

  • {PREFIX}.attach : str, default: /describe

    Specifies the path to attach the controller to the current application’s router. Note that this uses the add_controller directive, and ensures that pyramid-controllers has already been added via an explicit call to config.include(). This path will serve the default format: to request alternate formats, use “PATH/FILENAME.EXT” (where FILENAME is controlled by the {PREFIX}.filename configuration and EXT specifies the format) or use the “format=EXT” query-string. Examples using the default settings:

  • {PREFIX}.fullname : str, default: ‘application’

    Sets the filename (excluding the extension) that the output will be served at using the DescribeController. The extension provided by the request will determine which format to serve, and must be listed in the formats option. If the format is not listed, a 404 is returned. Typically, this is set to the application’s name and might also include the application version.

  • {PREFIX}.basename : str, default: null

    Similar to the fullname option, this option sets a filename base component that will either redirect to the current fullname or actually serve the content based on the base-redirect option. This allows there to be a persistent known location that can be used if the filename option is dynamic or changes with revisions.

  • {PREFIX}.index-redirect : { bool, int, str }, default: true

    Controls what happens when a request comes to the index location of the DescribeController, i.e. the value of the attach option. The following values are accepted:


    Responds with the actual content using the default format.


    Redirects with a 302 to the basename if set, otherwise to the fullname, using the default format’s extension.


    Same as if truthy, but uses the specified response code (e.g. 301 instead of 302).


    Responds with a redirect using the specified string as the Location header. By default, issues a 302 unless the string is prefixed with the code and a space, e.g. 301 /path/to/filename. If the location is not absolute, it will be evaluated relative to the current URL.

  • {PREFIX}.base-redirect : { bool, int, str }, default: true

    If basename is set, then this controls how the response is handled – see the index-redirect option for accepted values, with the adjustment that the default redirect location is the fullname.

  • {PREFIX}.inspect : str, default: /

    Specifies the top-level URL to start the application inspection at.

    IMPORTANT: this is not currently implemented the way that it should be… the current workaround simply adds the specified path (and its descendants) to the include list.

  • {PREFIX}.include : list(regex-spec), default: null

    The include option lists encapsulated regular expressions that an endpoint must match at least one of in order to be included in the output. This option can be used with the exclude option, in which case endpoints are first matched for inclusion, then matched for exclusion (i.e. the order is “allow,deny” in apache terminology).

    Encapsulated regular expressions are expressed in the syntax “/EXPR/FLAGS”, where the “/” can be replaced by any character otherwise not found in the rest of the expression. The flags can be any combination of the following characters:

    • i: Case-insensitive matching.
    • l: Use locale-dependent processing (for w, W, etc.).
    • m: Multi-line mode, i.e. “^” and “$” match individual lines.
    • s: The “.” matches newlines as well.
    • u: Use the unicode properties db (for w, W, etc.).
    • x: Allow verbose regular expressions.


    describe.include = :^/api/:i :^/foo(/.*)?$:
    describe.exclude = :.*/private(/.*)?$:i
  • {PREFIX}.exclude : list(regex-spec), default: null

    The inverse of the include option – see include for details.

  • {PREFIX}.entries.parsers : list(resolve-spec), default: ‘pyramid_describe.syntax.default’

    This option specifies a callable (or string in python dot syntax) or list thereof that modify the entries before they are rendered. These parsers are intended to augment the documentation in some way. For example, formal syntax documentation may be extracted from the plain-text documentation. Or special short-hand syntax can be converted to standard reStructuredText format.

    Each entry that is selected for inclusion for rendering is first passed through each parser and replaced by the return value from the call. This is done for each parser consecutively. If any parser returns None, the entry is removed from the selection list.

    By default, the ‘pyramid_describe.syntax.default’ parser is applied, which works as described in Documentation Conventions. This default parser can be disabled (by setting this option to null), replaced (by setting this option to another callable), or extended (by setting this option to the default and appending any custom parsers to it).

    Parsers are passed two parameters: an entry object (see pyramid_describe.entry.Entry for detailed attributes) and an options dictionary. The latter has many interesting attributes, including a reference to the current request.

    Note that the entry object may represent either a single method of an endpoint, or the entire endpoint. The methods will be sent through the parser before the entire endpoint.

    TODO: add documentation about entry and options.

    The result of a parser operation is expected to be cacheable; this means that it should only be sensitive to the data in the actual entry itself, not the current request. For that, see the entries.filters option.

    Each parser must be a callable; if it is not, then the object’s parser attribute will be tried instead. This allows the option to specify just the name of a module that contains a def parser(...): ... function definition.

  • {PREFIX}.entries.filters : list(resolve-spec), default: null

    This option is identical in syntax to the entries.parsers option, is called with the same parameters, and is expected to have the same return type.

    The crucial difference, however, is that the result of the filters is not expected to be cacheable. Therefore, a filter is the more appropriate place to do access control: entries (or sections thereof) can be removed (by returning None) or modified in any way (by returning a modified entry).

    Note that parsers and filters typically work together in this respect by, for example, having the parser decorate the entry with classes that the filter then inspects.

    Note that there is a separate filters option that is used to filter the entire output document, which is format-specific. See the formatting options for details.

  • {PREFIX}.render.template : asset-spec, default: null

    Overrides the rendering of the endpoints from separate units into one document. By default, the document is rendered as a simple document with a title, a section for the endpoints, and the legend.

    However, this document can also be generated using a pyramid template using the render.template option, as long as it outputs reStructuredText. To include the documentation generated by the endpoints, the doc.endpoint directive is used.

    The doc.endpoint directive takes a single argument that can have any of the following formats:

    • .. doc.endpoint:: GLOB:

      Specifies than the documentation for any endpoint whose path matches the specified GLOB pattern should replace the directive. The GLOB syntax uses globre rules, basically that * matches zero or more characters except /, ** matches zero or more of any character (including /), and ? matches any single character except / (there are some other rules too – see globre for details). One additional rule specific to pyramid-describe is that /** at the end of a pattern matches a path without the trailing / as well.

    • .. doc.endpoint:: regex:EXPR:

      Specifies a regular expression to match against the path of all endpoints to be included.

    • .. doc.endpoint:: unmatched:EXPR

      Identical to the regex:EXPR format, except only endpoints that match the expression AND that have not already been included previously in the document are now included.

    • .. doc.endpoint:: unmatched

      Matches and includes all endpoints that have not been included yet.

    The template is provided the same data, options and request parameters as other filters.

    Note that the output from this rendering is NOT cached, and it is therefore acceptable at this point to render request-specific output.

    An example; the following configuration:

    describe.render.template = myapp:template/docs.mako

    would use the Mako templating engine (standard Pyramid template engine selection is performed) to parse and render the template/docs.mako file inside the myapp module. This template can leverage all the standard Mako syntax, as long as it outputs valid reStructuredText. An example template:

    Application Documentation
    <%! import time %>
    Rendered on: ${time.asctime()}.
    Public Endpoints
    .. doc.endpoint:: regex:^/public(/.*)?$
    Other Endpoints
    .. doc.endpoint:: unmatched
    <%include file="othe-docs-and-copyright.mako"/>
  • {PREFIX}.formats : list(str), default: [‘html’, ‘txt’, ‘pdf’, ‘rst’, ‘json’, ‘yaml’, ‘wadl’, ‘xml’]

    Specifies the list of formats that can be generated. The default list includes all supported built-in formats, but this can be extended by adding a format to this list and then specifying a template to render the format. For example:

    # declare support for HTML, JSON and SWF
    describe.formats = html json swf
    # HTML and JSON are built-in, but SWF needs a custom template
    describe.format.swf.renderer = mypackage:templates/describe-swf.mako

    Note that the “pdf” and “yaml” formats require that optional python package dependencies be installed (respectively pdfkit and PyYAML), and that pdfkit furthermore requires that the wkhtmltopdf program be available.

  • {PREFIX}.format.default : str, default: first format listed in {PREFIX}.formats

    Set the default format if not specified in the request.

  • {PREFIX}.format.{FORMAT}.renderer : asset-spec, default: ‘pyramid_describe:template/{FORMAT}.mako’

    Override the default renderer for the specified format using a pyramid-style asset specification. The default is to use the pyramid-describe template with the exception of the structured data formats (JSON, YAML, XML, and WADL), which do not use a template.

    Specifying a renderer pre-empts all other rendering fallback mechanisms.

    See Format Cascading for details on how the {FORMAT} string is evaluated.

  • {PREFIX}.format.request : { bool, list(str) }, default: false

    Specifies which options, if any, can be controlled by request parameters. The setting can either be a boolean (“true”, “false”, etc), or a list of options. If truthy, all options can be specified. If falsy, no options can be specified. Otherwise it is interpreted as a space-separated list of options that can be specified.

    Note that this setting can be overridden on a per-format basis by the format.{FORMAT}.request setting.

  • {PREFIX}.format.{FORMAT}.request : { bool, list(str) }, default: none

    The per-format version of format.request. Note that this completely overrides the format.request setting for the given format, it does not extend it.

    See Format Cascading for details on how the {FORMAT} string is evaluated.

  • {PREFIX}.format.default.{OPTION}

    Set a default rendering option for all formats. Note that this can be overridden by request parameters (see the format.request option). See the Format Options section for a list of all supported options.

  • {PREFIX}.format.override.{OPTION}

    Set a rendering option for all formats that overrides any request parameters. See the Format Options section for a list of all supported options.

  • {PREFIX}.format.{FORMAT}.default.{OPTION}

    Set a default rendering option for the specified format, which overrides any default value set for all formats. Note that this can be overridden by request parameters (see the format.request option). See the Format Options section for a list of all supported options.

    See Format Cascading for details on how the {FORMAT} string is evaluated.

  • {PREFIX}.format.{FORMAT}.override.{OPTION}

    Set a rendering option for the specified format that overrides any request parameters and any generic format override options. See the Format Options section for a list of all supported options.

    See Format Cascading for details on how the {FORMAT} string is evaluated.

Format Cascading

Some formats are rendered based on the output of other renderers. For example, PDF’s are generated from HTML, and HTML is in turn generated from reStructuredText. Because options may need to be different for the the various formats based on the ultimate output, there is the ability to specify “cascaded” formats by joining them with a “+” in the settings. The cascaded options can either be explicitly overriden or explicitly reverted to their system-wide default by setting them to the special value pyramid_describe:DEFAULT.

Therefore, options for format “rst” apply to the reStructuredText rendering, regardless of ultimate output. Options for format “rst+html” apply to reStructuredText rendering, but only if the next renderer is “html”. These can be chained to any depth, for example options for format “rst+html+pdf” apply to reStructuredText rendering, but only if the next renderer is “html” followed by “pdf”. Note that one cannot skip a renderer in a rendering pipeline, e.g. in the previous case, you cannot short-hand the format as “rst+pdf”.

For example, the following configuration will apply a different CSS to the HTML rendering based on whether the output is going to be HTML, PDF, or SWF:

# the following sets the `cssPath` option for *any* HTML rendering:
describe.format.html.default.cssPath = myapp:style/rst2html.css

# this now overrides the `cssPath` option during rendering of the
# HTML, but only in the context of a PDF rendering:
describe.format.html+pdf.default.cssPath = myapp:style/rst2pdf.css

# when generating SWFs, this tells the describer to revert to using
# the system default value of `cssPath`:
describe.format.html+swf.default.cssPath = pyramid_describe:DEFAULT

Format Options

  • title : str, default: ‘Contents of “{PATH}”’

  • endpoints.title : str, default: ‘Endpoints’

  • legend.title : str, default: ‘Legend’

  • showUnderscore : bool, default: false

  • showUndoc : bool, default: true

  • showLegend : bool, default: true

  • showBranches : bool, default: false

  • pruneIndex : bool, default: true

  • showRest : bool, default: true

  • showImpl : bool, default: false

  • showInfo : bool, default: true

  • showName : bool, default: true

  • showDecorated : bool, default: true

  • showExtra : bool, default: true

  • showMethods : bool, default: true

  • showIds : bool, default: true

  • showDynamic : bool, default: true

  • showGenerator : bool, default: true

  • showGenVersion : bool, default: true

  • showLocation : bool, default: true

  • ascii : bool, default: false

  • maxdepth : int, default: 1024

  • width : int, default: 79

  • maxDocColumn : int, default: null

  • minDocLength : int, default: 20

  • cssEmbed : bool, default: true

  • cssPath : { asset-spec, resolve-spec, list({ asset-spec, resolve-spec }) }, default: ‘pyramid_describe:template/rst2html.css’

  • rstMax : bool, default: false

  • rstPdfkit : bool, default: true

  • stubFormat : str, default: ‘{{{}}}’

  • dynamicFormat : str, default: ‘{}/?’

  • restFormat : str, default: ‘<{}>’

  • pdfkit.options : yaml-str

    This option is YAML-parsed, and then sets the options that are inserted into the HTML meta tags that are instructions to the pdfkit processor. The default values specified by pyramid-describe are:

      margin-top: 10mm,
      margin-right: 10mm,
      margin-bottom: 10mm,
      margin-left: 10mm,

    Options not specified revert to the defaults specified by pdfkit. For details, see pdfkit and wkhtmltopdf. Options that may be of interest:

    • grayscale
    • page-size
    • orientation
    • no-outline
    • print-media-type
    • disable-plugins
    • zoom
    • javascript-delay
    • disable-javascript
  • restVerbs : list(str), default: pyramid_controllers.restcontroller.HTTP_METHODS

    Sets the list of known HTTP methods. This is used during inspection to determine whether a given exposed method on a RestController can be accessed via an HTTP method.

  • filters : list(resolve-spec), default: null

    Unlike the top-level entries.filters setting which filters individual entries as they get selected for rendering, the format-specific filters option is called on the entire data object before final rendering, and is very format-specific in what is made available.

    For the structured-data formats (JSON, YAML, XML, and WADL), the filters are provided the data object created by Describer.structure_render. Each filter is expected to return that object (enhanced in some way), or a new object to replace it.

    For RST and HTML, the filters are provided a docutils.nodes.document object (as is returned by docutils.core.publish_doctree).

    For PDF, rendering is accomplished from entries to RST to HTML to PDF. Therefore, the filtering occurs during the RST to HTML transformation – there is no separate PDF-only filtering. If filtering is needed at one of the previous stages that is required only during PDF generation (but not, for example, to HTML), then the formatstack option can be inspected, which will include 'pdf' during the HTML filtering. For example:

    def html_filter(doc, stage):
      if 'pdf' in stage.options.formatstack:
        # do PDF-specific filtering...
        # do filtering for everything except PDF...
      return doc

    TODO: add documentation about data and options.

  • encoding : str, default: ‘UTF-8’

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