From 3293d8a526ca2aba5313db15ab96df6b78d6dd52 Mon Sep 17 00:00:00 2001 From: Kyle Fuller Date: Sun, 27 Nov 2016 18:03:39 +0000 Subject: [PATCH] feat: Add documentation --- docs/Makefile | 225 +++++++++++++++++++ docs/_templates/sidebar_intro.html | 33 +++ docs/builtins.rst | 122 +++++++++++ docs/conf.py | 341 +++++++++++++++++++++++++++++ docs/index.rst | 41 ++++ docs/templates.rst | 76 +++++++ 6 files changed, 838 insertions(+) create mode 100644 docs/Makefile create mode 100644 docs/_templates/sidebar_intro.html create mode 100644 docs/builtins.rst create mode 100644 docs/conf.py create mode 100644 docs/index.rst create mode 100644 docs/templates.rst diff --git a/docs/Makefile b/docs/Makefile new file mode 100644 index 0000000..94cdff3 --- /dev/null +++ b/docs/Makefile @@ -0,0 +1,225 @@ +# Makefile for Sphinx documentation +# + +# You can set these variables from the command line. +SPHINXOPTS = +SPHINXBUILD = sphinx-build +PAPER = +BUILDDIR = _build + +# Internal variables. +PAPEROPT_a4 = -D latex_paper_size=a4 +PAPEROPT_letter = -D latex_paper_size=letter +ALLSPHINXOPTS = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) . +# the i18n builder cannot share the environment and doctrees with the others +I18NSPHINXOPTS = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) . + +.PHONY: help +help: + @echo "Please use \`make ' where is one of" + @echo " html to make standalone HTML files" + @echo " dirhtml to make HTML files named index.html in directories" + @echo " singlehtml to make a single large HTML file" + @echo " pickle to make pickle files" + @echo " json to make JSON files" + @echo " htmlhelp to make HTML files and a HTML help project" + @echo " qthelp to make HTML files and a qthelp project" + @echo " applehelp to make an Apple Help Book" + @echo " devhelp to make HTML files and a Devhelp project" + @echo " epub to make an epub" + @echo " epub3 to make an epub3" + @echo " latex to make LaTeX files, you can set PAPER=a4 or PAPER=letter" + @echo " latexpdf to make LaTeX files and run them through pdflatex" + @echo " latexpdfja to make LaTeX files and run them through platex/dvipdfmx" + @echo " text to make text files" + @echo " man to make manual pages" + @echo " texinfo to make Texinfo files" + @echo " info to make Texinfo files and run them through makeinfo" + @echo " gettext to make PO message catalogs" + @echo " changes to make an overview of all changed/added/deprecated items" + @echo " xml to make Docutils-native XML files" + @echo " pseudoxml to make pseudoxml-XML files for display purposes" + @echo " linkcheck to check all external links for integrity" + @echo " doctest to run all doctests embedded in the documentation (if enabled)" + @echo " coverage to run coverage check of the documentation (if enabled)" + @echo " dummy to check syntax errors of document sources" + +.PHONY: clean +clean: + rm -rf $(BUILDDIR)/* + +.PHONY: html +html: + $(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html + @echo + @echo "Build finished. The HTML pages are in $(BUILDDIR)/html." + +.PHONY: dirhtml +dirhtml: + $(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml + @echo + @echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml." + +.PHONY: singlehtml +singlehtml: + $(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml + @echo + @echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml." + +.PHONY: pickle +pickle: + $(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle + @echo + @echo "Build finished; now you can process the pickle files." + +.PHONY: json +json: + $(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json + @echo + @echo "Build finished; now you can process the JSON files." + +.PHONY: htmlhelp +htmlhelp: + $(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp + @echo + @echo "Build finished; now you can run HTML Help Workshop with the" \ + ".hhp project file in $(BUILDDIR)/htmlhelp." + +.PHONY: qthelp +qthelp: + $(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp + @echo + @echo "Build finished; now you can run "qcollectiongenerator" with the" \ + ".qhcp project file in $(BUILDDIR)/qthelp, like this:" + @echo "# qcollectiongenerator $(BUILDDIR)/qthelp/Stencil.qhcp" + @echo "To view the help file:" + @echo "# assistant -collectionFile $(BUILDDIR)/qthelp/Stencil.qhc" + +.PHONY: applehelp +applehelp: + $(SPHINXBUILD) -b applehelp $(ALLSPHINXOPTS) $(BUILDDIR)/applehelp + @echo + @echo "Build finished. The help book is in $(BUILDDIR)/applehelp." + @echo "N.B. You won't be able to view it unless you put it in" \ + "~/Library/Documentation/Help or install it in your application" \ + "bundle." + +.PHONY: devhelp +devhelp: + $(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp + @echo + @echo "Build finished." + @echo "To view the help file:" + @echo "# mkdir -p $$HOME/.local/share/devhelp/Stencil" + @echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/Stencil" + @echo "# devhelp" + +.PHONY: epub +epub: + $(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub + @echo + @echo "Build finished. The epub file is in $(BUILDDIR)/epub." + +.PHONY: epub3 +epub3: + $(SPHINXBUILD) -b epub3 $(ALLSPHINXOPTS) $(BUILDDIR)/epub3 + @echo + @echo "Build finished. The epub3 file is in $(BUILDDIR)/epub3." + +.PHONY: latex +latex: + $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex + @echo + @echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex." + @echo "Run \`make' in that directory to run these through (pdf)latex" \ + "(use \`make latexpdf' here to do that automatically)." + +.PHONY: latexpdf +latexpdf: + $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex + @echo "Running LaTeX files through pdflatex..." + $(MAKE) -C $(BUILDDIR)/latex all-pdf + @echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex." + +.PHONY: latexpdfja +latexpdfja: + $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex + @echo "Running LaTeX files through platex and dvipdfmx..." + $(MAKE) -C $(BUILDDIR)/latex all-pdf-ja + @echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex." + +.PHONY: text +text: + $(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text + @echo + @echo "Build finished. The text files are in $(BUILDDIR)/text." + +.PHONY: man +man: + $(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man + @echo + @echo "Build finished. The manual pages are in $(BUILDDIR)/man." + +.PHONY: texinfo +texinfo: + $(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo + @echo + @echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo." + @echo "Run \`make' in that directory to run these through makeinfo" \ + "(use \`make info' here to do that automatically)." + +.PHONY: info +info: + $(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo + @echo "Running Texinfo files through makeinfo..." + make -C $(BUILDDIR)/texinfo info + @echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo." + +.PHONY: gettext +gettext: + $(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale + @echo + @echo "Build finished. The message catalogs are in $(BUILDDIR)/locale." + +.PHONY: changes +changes: + $(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes + @echo + @echo "The overview file is in $(BUILDDIR)/changes." + +.PHONY: linkcheck +linkcheck: + $(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck + @echo + @echo "Link check complete; look for any errors in the above output " \ + "or in $(BUILDDIR)/linkcheck/output.txt." + +.PHONY: doctest +doctest: + $(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest + @echo "Testing of doctests in the sources finished, look at the " \ + "results in $(BUILDDIR)/doctest/output.txt." + +.PHONY: coverage +coverage: + $(SPHINXBUILD) -b coverage $(ALLSPHINXOPTS) $(BUILDDIR)/coverage + @echo "Testing of coverage in the sources finished, look at the " \ + "results in $(BUILDDIR)/coverage/python.txt." + +.PHONY: xml +xml: + $(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml + @echo + @echo "Build finished. The XML files are in $(BUILDDIR)/xml." + +.PHONY: pseudoxml +pseudoxml: + $(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml + @echo + @echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml." + +.PHONY: dummy +dummy: + $(SPHINXBUILD) -b dummy $(ALLSPHINXOPTS) $(BUILDDIR)/dummy + @echo + @echo "Build finished. Dummy builder generates no files." diff --git a/docs/_templates/sidebar_intro.html b/docs/_templates/sidebar_intro.html new file mode 100644 index 0000000..6e5f6d2 --- /dev/null +++ b/docs/_templates/sidebar_intro.html @@ -0,0 +1,33 @@ +

Stencil

+ +

+ +

+ +

Stencil is a simple and powerful template language for Swift.

+ + + +

Other Projects

+ +

More Kyle Fuller projects:

+ diff --git a/docs/builtins.rst b/docs/builtins.rst new file mode 100644 index 0000000..45127cc --- /dev/null +++ b/docs/builtins.rst @@ -0,0 +1,122 @@ +Built-in template tags and filters +================================== + +.. _built-in-tags: + +Built-in Tags +------------- + +``for`` +~~~~~~~ + +A for loop allows you to iterate over an array found by variable lookup. + +.. code-block:: html+django + +
    + {% for user in users %} +
  • {{ user }}
    • + {% endfor %} +
+ +The ``for`` tag can take an optional ``{% empty %}`` block that will be +displayed if the given list is empty or could not be found. + +.. code-block:: html+django + +
    + {% for user in users %} +
  • {{ user }}
    • + {% empty %} +
  • There are no users.
    • + {% endfor %} +
+ +The for block sets a few variables available within the loop: + +- ``first`` - True if this is the first time through the loop +- ``last`` - True if this is the last time through the loop +- ``counter`` - The current iteration of the loop + +``if`` +~~~~~~ + +.. code-block:: html+django + + {% if variable %} + The variable was found in the current context. + {% else %} + The variable was not found. + {% endif %} + +``ifnot`` +~~~~~~~~~ + +.. code-block:: html+django + + {% ifnot variable %} + The variable was NOT found in the current context. + {% else %} + The variable was found. + {% endif %} + +``now`` +~~~~~~~ + +``include`` +~~~~~~~~~~~ + +You can include another template using the `include` tag. + +.. code-block:: html+django + + {% include "comment.html" %} + +The `include` tag requires a TemplateLoader to be found inside your context with the paths, or bundles used to lookup the template. + +.. code-block:: swift + + let context = Context(dictionary: [ + "loader": TemplateLoader(bundle:[NSBundle.mainBundle()]) + ]) + +``extends`` +~~~~~~~~~~~ + +``block`` +~~~~~~~~~ + +.. _built-in-filters: + +Built-in Filters +---------------- + +``capitalize`` +~~~~~~~~~~~~~~ + +The capitalize filter allows you to capitalize a string. +For example, `stencil` to `Stencil`. + +.. code-block:: html+django + + {{ "stencil"|capitalize }} + +``uppercase`` +~~~~~~~~~~~~~ + +The uppercase filter allows you to transform a string to uppercase. +For example, `Stencil` to `STENCIL`. + +.. code-block:: html+django + + {{ "Stencil"|uppercase }} + +``lowercase`` +~~~~~~~~~~~~~ + +The uppercase filter allows you to transform a string to lowercase. +For example, `Stencil` to `stencil`. + +.. code-block:: html+django + + {{ "Stencil"|lowercase }} diff --git a/docs/conf.py b/docs/conf.py new file mode 100644 index 0000000..a189e60 --- /dev/null +++ b/docs/conf.py @@ -0,0 +1,341 @@ +#!/usr/bin/env python3 +# -*- coding: utf-8 -*- +# +# Stencil documentation build configuration file, created by +# sphinx-quickstart on Sun Nov 27 05:54:36 2016. +# +# This file is execfile()d with the current directory set to its +# containing dir. +# +# Note that not all possible configuration values are present in this +# autogenerated file. +# +# All configuration values have a default; values that are commented out +# serve to show the default. + +# If extensions (or modules to document with autodoc) are in another directory, +# add these directories to sys.path here. If the directory is relative to the +# documentation root, use os.path.abspath to make it absolute, like shown here. +# +# import os +# import sys +# sys.path.insert(0, os.path.abspath('.')) + +# -- General configuration ------------------------------------------------ + +# If your documentation needs a minimal Sphinx version, state it here. +# +# needs_sphinx = '1.0' + +# Add any Sphinx extension module names here, as strings. They can be +# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom +# ones. +extensions = [] + +# Add any paths that contain templates here, relative to this directory. +templates_path = ['_templates'] + +# The suffix(es) of source filenames. +# You can specify multiple suffix as a list of string: +# +# source_suffix = ['.rst', '.md'] +source_suffix = '.rst' + +# The encoding of source files. +# +# source_encoding = 'utf-8-sig' + +# The master toctree document. +master_doc = 'index' + +# General information about the project. +project = 'Stencil' +copyright = '2016, Kyle Fuller' +author = 'Kyle Fuller' + +# The version info for the project you're documenting, acts as replacement for +# |version| and |release|, also used in various other places throughout the +# built documents. +# +# The short X.Y version. +version = '0.6.0' +# The full version, including alpha/beta/rc tags. +release = '0.6.0' + +# The language for content autogenerated by Sphinx. Refer to documentation +# for a list of supported languages. +# +# This is also used if you do content translation via gettext catalogs. +# Usually you set "language" from the command line for these cases. +language = None + +# There are two options for replacing |today|: either, you set today to some +# non-false value, then it is used: +# +# today = '' +# +# Else, today_fmt is used as the format for a strftime call. +# +# today_fmt = '%B %d, %Y' + +# List of patterns, relative to source directory, that match files and +# directories to ignore when looking for source files. +# This patterns also effect to html_static_path and html_extra_path +exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store'] + +# The reST default role (used for this markup: `text`) to use for all +# documents. +# +# default_role = None + +# If true, '()' will be appended to :func: etc. cross-reference text. +# +# add_function_parentheses = True + +# If true, the current module name will be prepended to all description +# unit titles (such as .. function::). +# +# add_module_names = True + +# If true, sectionauthor and moduleauthor directives will be shown in the +# output. They are ignored by default. +# +# show_authors = False + +# The name of the Pygments (syntax highlighting) style to use. +pygments_style = 'sphinx' + +# A list of ignored prefixes for module index sorting. +# modindex_common_prefix = [] + +# If true, keep warnings as "system message" paragraphs in the built documents. +# keep_warnings = False + +# If true, `todo` and `todoList` produce output, else they produce nothing. +todo_include_todos = False + + +# -- Options for HTML output ---------------------------------------------- + +# The theme to use for HTML and HTML Help pages. See the documentation for +# a list of builtin themes. +# +html_theme = 'alabaster' + +# Theme options are theme-specific and customize the look and feel of a theme +# further. For a list of options available for each theme, see the +# documentation. +# +# html_theme_options = {} + +# Add any paths that contain custom themes here, relative to this directory. +# html_theme_path = [] + +# The name for this set of Sphinx documents. +# " v documentation" by default. +# +# html_title = 'Stencil v0.6.0' + +# A shorter title for the navigation bar. Default is the same as html_title. +# +# html_short_title = None + +# The name of an image file (relative to this directory) to place at the top +# of the sidebar. +# +# html_logo = None + +# The name of an image file (relative to this directory) to use as a favicon of +# the docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32 +# pixels large. +# +# html_favicon = None + +# Add any paths that contain custom static files (such as style sheets) here, +# relative to this directory. They are copied after the builtin static files, +# so a file named "default.css" will overwrite the builtin "default.css". +html_static_path = ['_static'] + +# Add any extra paths that contain custom files (such as robots.txt or +# .htaccess) here, relative to this directory. These files are copied +# directly to the root of the documentation. +# +# html_extra_path = [] + +# If not None, a 'Last updated on:' timestamp is inserted at every page +# bottom, using the given strftime format. +# The empty string is equivalent to '%b %d, %Y'. +# +# html_last_updated_fmt = None + +# If true, SmartyPants will be used to convert quotes and dashes to +# typographically correct entities. +# +# html_use_smartypants = True + +# Custom sidebar templates, maps document names to template names. +html_sidebars = { + 'index': ['sidebar_intro.html', 'searchbox.html'], + '**': ['sidebar_intro.html', 'localtoc.html', 'relations.html', 'searchbox.html'], +} + +# Additional templates that should be rendered to pages, maps page names to +# template names. +# +# html_additional_pages = {} + +# If false, no module index is generated. +# +# html_domain_indices = True + +# If false, no index is generated. +# +# html_use_index = True + +# If true, the index is split into individual pages for each letter. +# +# html_split_index = False + +# If true, links to the reST sources are added to the pages. +# +# html_show_sourcelink = True + +# If true, "Created using Sphinx" is shown in the HTML footer. Default is True. +# +# html_show_sphinx = True + +# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True. +# +# html_show_copyright = True + +# If true, an OpenSearch description file will be output, and all pages will +# contain a tag referring to it. The value of this option must be the +# base URL from which the finished HTML is served. +# +# html_use_opensearch = '' + +# This is the file name suffix for HTML files (e.g. ".xhtml"). +# html_file_suffix = None + +# Language to be used for generating the HTML full-text search index. +# Sphinx supports the following languages: +# 'da', 'de', 'en', 'es', 'fi', 'fr', 'h', 'it', 'ja' +# 'nl', 'no', 'pt', 'ro', 'r', 'sv', 'tr', 'zh' +# +# html_search_language = 'en' + +# A dictionary with options for the search language support, empty by default. +# 'ja' uses this config value. +# 'zh' user can custom change `jieba` dictionary path. +# +# html_search_options = {'type': 'default'} + +# The name of a javascript file (relative to the configuration directory) that +# implements a search results scorer. If empty, the default will be used. +# +# html_search_scorer = 'scorer.js' + +# Output file base name for HTML help builder. +htmlhelp_basename = 'Stencildoc' + +# -- Options for LaTeX output --------------------------------------------- + +latex_elements = { + # The paper size ('letterpaper' or 'a4paper'). + # + # 'papersize': 'letterpaper', + + # The font size ('10pt', '11pt' or '12pt'). + # + # 'pointsize': '10pt', + + # Additional stuff for the LaTeX preamble. + # + # 'preamble': '', + + # Latex figure (float) alignment + # + # 'figure_align': 'htbp', +} + +# Grouping the document tree into LaTeX files. List of tuples +# (source start file, target name, title, +# author, documentclass [howto, manual, or own class]). +latex_documents = [ + (master_doc, 'Stencil.tex', 'Stencil Documentation', + 'Kyle Fuller', 'manual'), +] + +# The name of an image file (relative to this directory) to place at the top of +# the title page. +# +# latex_logo = None + +# For "manual" documents, if this is true, then toplevel headings are parts, +# not chapters. +# +# latex_use_parts = False + +# If true, show page references after internal links. +# +# latex_show_pagerefs = False + +# If true, show URL addresses after external links. +# +# latex_show_urls = False + +# Documents to append as an appendix to all manuals. +# +# latex_appendices = [] + +# It false, will not define \strong, \code, itleref, \crossref ... but only +# \sphinxstrong, ..., \sphinxtitleref, ... To help avoid clash with user added +# packages. +# +# latex_keep_old_macro_names = True + +# If false, no module index is generated. +# +# latex_domain_indices = True + + +# -- Options for manual page output --------------------------------------- + +# One entry per manual page. List of tuples +# (source start file, name, description, authors, manual section). +man_pages = [ + (master_doc, 'stencil', 'Stencil Documentation', + [author], 1) +] + +# If true, show URL addresses after external links. +# +# man_show_urls = False + + +# -- Options for Texinfo output ------------------------------------------- + +# Grouping the document tree into Texinfo files. List of tuples +# (source start file, target name, title, author, +# dir menu entry, description, category) +texinfo_documents = [ + (master_doc, 'Stencil', 'Stencil Documentation', + author, 'Stencil', 'One line description of project.', + 'Miscellaneous'), +] + +# Documents to append as an appendix to all manuals. +# +# texinfo_appendices = [] + +# If false, no module index is generated. +# +# texinfo_domain_indices = True + +# How to display URL addresses: 'footnote', 'no', or 'inline'. +# +# texinfo_show_urls = 'footnote' + +# If true, do not generate a @detailmenu in the "Top" node's menu. +# +# texinfo_no_detailmenu = False diff --git a/docs/index.rst b/docs/index.rst new file mode 100644 index 0000000..f2ebb30 --- /dev/null +++ b/docs/index.rst @@ -0,0 +1,41 @@ +The Stencil template language +============================= + +Stencil is a simple and powerful template language for Swift. It provides a +syntax similar to Django and Mustache. If you're familiar with these, you will +feel right at home with Stencil. + +.. code-block:: html+django + + There are {{ articles.count }} articles. + +
    + {% for article in articles %} +
  • {{ article.title }} by {{ article.author }}
    • + {% endfor %} +
+ +.. code-block:: swift + + let context = Context(dictionary: [ + "articles": [ + [ "title": "Migrating from OCUnit to XCTest", "author": "Kyle Fuller" ], + [ "title": "Memory Management with ARC", "author": "Kyle Fuller" ], + ] + ]) + + do { + let template = try Template(named: "template.stencil") + let rendered = try template.render(context) + print(rendered) + } catch { + print("Failed to render template \(error)") + } + +Contents: + +.. toctree:: + :maxdepth: 2 + + templates + builtins diff --git a/docs/templates.rst b/docs/templates.rst new file mode 100644 index 0000000..d112936 --- /dev/null +++ b/docs/templates.rst @@ -0,0 +1,76 @@ +Templates +========= + +- ``{{ ... }}`` for variables to print to the template output +- ``{% ... %}`` for tags +- ``{# ... #}`` for comments not included in the template output + +Variables +--------- + +A variable can be defined in your template using the following: + +.. code-block:: html+django + + {{ variable }} + +Stencil will look up the variable inside the current variable context and +evaluate it. When a variable contains a dot, it will try doing the +following lookup: + +- Context lookup +- Dictionary lookup +- Array lookup (first, last, count, index) +- Key value coding lookup + +For example, if `people` was an array: + +.. code-block:: html+django + + There are {{ people.count }} people. {{ people.first }} is the first + person, followed by {{ people.1 }}. + +Filters +~~~~~~~ + +Filters allow you to transform the values of variables. For example, they look like: + +.. code-block:: html+django + + {{ variable|uppercase }} + +See :ref:`all builtin filters `. + +Tags +---- + +Tags are a mechanism to execute a piece of code, allowing you to have +control flow within your template. + +.. code-block:: html+django + + {% if variable %} + {{ variable }} was found. + {% endif %} + +A tag can also affect the context and define variables as follows: + +.. code-block:: html+django + + {% for item in items %} + {{ item }} + {% endfor %} + +Stencil includes of built-in tags which are listed below. You can also +extend Stencil by providing your own tags. + +See :ref:`all builtin tags `. + +Comments +-------- + +To comment out part of your template, you can use the following syntax: + +.. code-block:: html+django + + {# My comment is completely hidden #}