Stencil is a simple and powerful template language for Swift.

Last update: Jan 4, 2023

Related tags

Overview

Stencil

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.

Example

There are {{ articles.count }} articles.

<ul>
  {% for article in articles %}
    <li>{{ article.title }} by {{ article.author }}</li>
  {% endfor %}
</ul>

import Stencil

struct Article {
  let title: String
  let author: String
}

let context = [
  "articles": [
    Article(title: "Migrating from OCUnit to XCTest", author: "Kyle Fuller"),
    Article(title: "Memory Management with ARC", author: "Kyle Fuller"),
  ]
]

let environment = Environment(loader: FileSystemLoader(paths: ["templates/"]))
let rendered = try environment.renderTemplate(name: "article_list.html", context: context)

print(rendered)

Philosophy

Stencil follows the same philosophy of Django:

If you have a background in programming, or if you’re used to languages which mix programming code directly into HTML, you’ll want to bear in mind that the Django template system is not simply Python embedded into HTML. This is by design: the template system is meant to express presentation, not program logic.

The User Guide

Resources for Stencil template authors to write Stencil templates:

Resources to help you integrate Stencil into a Swift project:

Projects that use Stencil

Sourcery, SwiftGen, Kitura, Weaver, Genesis

License

Stencil is licensed under the BSD license. See LICENSE for more info.

Comments

Optimise Scanner performance
This is a rebase of #207

✅ What I did:

squash of the commits

integrate the upstream changes about range reporting to fix the tests during the rebase process

remove Swift 3 from the build matrix

❌What I did not do:

benchmark if there is an actual performance improvement
opened by Liquidsoul 28
[Review] Jinja2-like whitespace trim behavior
This has been attempted at least twice in #85 and #32 .

In #89 you expressed interest in the way this is done in Jinja2, I've attempted to recreate that here. This is still Review because I'm waiting on feedback before adding:

options to Environment to set the default trim behaviors

documentation, more test cases, etc.

duplicate rock
opened by bejar37 24
Remove Dependency of PathKit for External Programs
There's no logical reason that a consuming program would need PathKit. An overloaded init could be included to support a plain String representation of a path that is internally converted to a PathKit Path.

This would remove an unnecessary third-party dependency.

public init(from paths: [String]) { ... }
question
opened by HelloFillip 17
Lots of blank empty lines in output

It appears if you use an if block, and it doesn't pass the truth test, it's still adding blank lines to the output. Have you found this to be correct?

opened by malkomalko 16
Critical performance issue
After refactoring my app, I'm seeing extreme rendering times, as bad as 14s sometimes. I'm not entirely sure what causes this, but I wanted to report it already, as I believe the issue lies with Stencil.

Here's what I have so far:

I'm using Stencil 0.11.

I didn't notice any issue in development. On macOS, 0.11 works fine and render times are < 100ms usually.

When deploying the same code to IBM Cloud, the render times become horrible (1-15s). This leads me to believe it's a Linux-specific issue. I'm not sure about that however, as I haven't been able to reproduce it on Linux via Docker, only when deploying to cloud.

I did not have this issue before when I was using 0.10.1.

I was able to reproduce the issue to a lesser extent on macOS as well. If I use the latest master, my render times jump over 1s as well.

I've added logging all throughout my handlers as well as Kitura and didn't notice any issues there. Almost all of the delay is caused by Stencil. I went as far as Template.render but haven't narrowed it down further yet.

All my templates uses inheritance. I'm having other issues with inheritance on master as well, so perhaps it related?

I would really appreciate any help in tracking down and resolving this issue as I need to release this app in the next few weeks.

I've also tried reverting back to 0.10, but that's giving me a compilation error on Linux I've yet to resolve:

PathKit.swift:299:11: error: cannot convert value of type 'ObjCBool' to expected argument type 'Bool'
opened by svanimpe 14
Editor and IDE support

I think the success of a project like Stencil depends in part on its editor and IDE support. I started out using Stencil with a Django plugin (to get some syntax highlighting at least), but found that less than ideal, which is why I built something specifically for Stencil. Earlier this year I wrote a TextMate bundle (https://github.com/svanimpe/stencil.tmbundle) and used that to build a VS Code extension (https://github.com/svanimpe/vscode-stencil). The latter has proven quite popular, with over 500 installs.

Unfortunately, I don't have the time to follow the repository closely and read every single commit to check if a change requires an update to the grammar. If possible, I would like to donate my work to the Stencil project.

Are you interested in this?

opened by svanimpe 13

Subscript syntax for Variables

This allows users to refer to variables (and properties) using indirection.

Let's say for example we have the following context:

[
  "object": [
    "name": "John",
    "role": "Developer",
    "location": "Somewhere"
  ],
  "visible": ["name", "role"]
]

A user can then write:

{% for property in visible %}
 - {{property}}: {{ object.$property }}
{% endfor %}

To produce:

- name: John
- role: Developer

enhancement

opened by djbe 12

Trim newlines
This fixes #22 and is an alternative to #32 The lexer removes white space and trailing newlines from block tokens if they are on their own line.

{% for item in items %} - {{item.name}} {% endfor %}

will now be rendered

- item 1 - item 2 - item 3
duplicate rock
opened by yonaskolb 12
Trim whitespace

This takes the work that @bejar37 started in #92 and builds upon it.

In addition to the Jinja2 trimming symbols, this adds a trimBehavior: TrimBehaviour on Environment. This defaults to .none but can be customized. It also comes with a built in .smart case that removes whitespace before a block, and whitespace and a single newline after a block.

opened by yonaskolb 10
Add Package.swift for Swift 4.2

This allows Stencil to be compiled with Swift 4.2

We should wait for new releases including https://github.com/kylef/PathKit/pull/56 and https://github.com/kylef/Spectre/pull/37

Also once Swift 4.2 is officially released we can add a CI job for it.

opened by keith 10
Added filter to apply dynamic filters
filter:arg will resolve its argument as filter expression which will allow to apply dynamic filters.

The use case for that can be using Sourcery to generated code for Codable protocols and use different key coding strategies applied for different data models. It will allow to specify strategy as one of Stencil filters in a type annotation, i.e. uppercaseFirstLetter or camelCaseToSnakeCase, or even filter with arguments.

Currently in template I have to check annotations against hardcoded set of filters to be able to apply them. With this change this template code

{% if strategy == "upperFirstLetter" %}{{ variable.name|replace:"_",""|upperFirstLetter }}{% else %}{{ variable.name|replace:"_",""|camelToSnakeCase }}{% endif %}

becomes this

{{ variable.name|replace:"_",""|filter:strategy }}

and allows to use any registered filter without changing anything in template.
opened by ilyapuchka 10

Question: Is there a better way to render blocks?

I'm trying to duplicate the functionality of Django-render-block. Basically I want the ability to only render a specific block in a template. I'm relatively new to Swift, so wasn't expecting much, but to my surprise, I got it to work like so

public extension Template {
    func render(block: String, _ context: Context) throws -> String {
        let context = context
        var append = false
        var collectedTokens = [Token]()
        
        for token in tokens {
            if token.contents.description.starts(with: "block \(block)") {
                append = true
            }
            
            if token.contents.description == "endblock \(block)" {
                break
            }
            
            if append {
                collectedTokens.append(token)
            }
        }

        let parser = TokenParser(tokens: collectedTokens, environment: context.environment)
        let nodes = try parser.parse()
        return try renderNodes(nodes, context)
    }
}

Obviously this is very crude and relies on a textual representation of the token, but it does exactly what I need and as a bonus it worked with custom tags. Is there a better more elegant way to achieve this?

opened by wombat2k 0

Question: Is there a way to nest tags
I'm trying to create a stencil for a document that consists of two columns and where I want the left column to be left justify and the right column right justified. ie:

abcd efgh abc fgh abcd efgh abc fgh

I could write a custom tag that would take the width of the page and the two parameters and this would work fine. The problem I run into is that each string would itself need to be a tag/variable (the left side are localised strings, the right side is data coming from app.

Any idea on how to do this?
opened by otusweb 1
How can I loop through an array passed as the context?
For example, if I have:

{% include "myTemplate.stencil" array1 %} {# "array1" is an array #}

And in myTemplate.stencil, how can I loop though it?

{% for item in ??? %} ... {% endfor %}

I can't seem to use the array properties either, like {{ count }}.
opened by Sweeper777 1

Windows newlines breaks the template engine?

I have this code (note the windows new lines \r\n in index):

let base = """
Hello World
{% block content %}
This is base
{% endblock %}
"""
let index = "{% extends \"base.stencil\" %}\r\n{% block content %}\r\nThis is Index\r\n{% endblock %}"
let env = Environment(loader: DictionaryLoader(templates: ["base.stencil": base, "index.stencil": index]))
do {
    print(try env.renderTemplate(name: "index.stencil"))
} catch {
    print(error)
}

This prints:

Hello World

This is base

As if everything after the first line of index got ignored. I know it's weird to have windows new lines on macOS, but I don't think the behaviour of the template engine should depend on what kind of newlines I use, right?

opened by Sweeper777 0

Added the option to throw when variable not found in context

The existing behaviour substitutes a variable that could not be resolved for an empty string without throwing any error.

This PR adds the option to throw when a variable that could not be resolved is used in a template (which means it was not defined in the context).

This is helpful to prevent errors in templates, for example if introducing a typo when referring to a variable.

opened by acecilia 8

Releases(0.15.1)

0.15.1(Jul 31, 2022)
Bug Fixes

Fix bug in LazyValueWrapper, causing it to never resolve.
David Jennes #328

Source code(tar.gz)
Source code(zip)
0.15.0(Jul 29, 2022)
Breaking

Drop support for Swift < 5. For Swift 4.2 support, you should use Stencil 0.14.2.
David Jennes #323

Enhancements

Added support for trimming whitespace around blocks with Jinja2 whitespace control symbols. eg {%- if value +%}.
Miguel Bejar Yonas Kolb #92 #287

Added support for adding default whitespace trimming behaviour to an environment.
Yonas Kolb #287

Blocks now can be used repeatedly in the template. When block is rendered for the first time its content will be cached and it can be rendered again later using {{ block.block_name }}.
Ilya Puchka #158 #182

Added break and continue tags to break or continue current loop.
Ilya Puchka #175

You can now access outer loop's scope by labeling it: {% outer: for ... %}... {% for ... %} {{ outer.counter }} {% endfor %}{% endfor %}.
Ilya Puchka #175

Boolean expressions can now be rendered, i.e {{ name == "John" }} will render true or false depending on the evaluation result.
Ilya Puchka David Jennes #164 #325

Enable dynamic member lookup using a new DynamicMemberLookup marker protocol. Conform your own types to this protocol to support dynamic member from with contexts.
Ilya Puchka #219 #246

Allow providing lazily evaluated context data, using the LazyValueWrapper structure.
David Jennes #324

Bug Fixes

Fixed using {{ block.super }} inside nodes other than block.
Ilya Puchka #266 #267

Internal Changes

Updated internal maintenance scripts, and switched to GitHub actions.
David Jennes #321

Made the tokens property on a Template public.
Stefanomondino #292

Made the Template.render(_:) method (that accepts a Context) public.
David Jennes #322

Source code(tar.gz)
Source code(zip)
0.14.2(Nov 3, 2021)
Internal Changes

Update Spectre (0.10) and PathKit to support Xcode 13.
Astromonkee #314

Source code(tar.gz)
Source code(zip)
0.14.1(Apr 11, 2021)
Bug Fixes

Fix for crashing range indexes when variable length is 1.
Łukasz Kuczborski #306

Source code(tar.gz)
Source code(zip)
0.14.0(Aug 17, 2020)
Breaking

Drop support for Swift < 4.2. For Swift 4 support, you should use Stencil 0.13.1.
David Jennes #294

Enhancements

Added support for dynamic filter using filter filter. With that you can define a variable with a name of filter , i.e. myfilter = "uppercase" and then use it to invoke this filter with {{ string|filter:myfilter }}.
Ilya Puchka #203

Deprecations

None

Bug Fixes

Fixed using parenthesis in boolean expressions, they now can be used without spaces around them.
Ilya Puchka #254

Throw syntax error on empty variable tags ({{ }}) instead fatalError.
Ilya Puchka #263

Internal Changes

Token type converted to struct to allow computing token components only once.
Ilya Puchka #256

Added SwiftLint to the project.
David Jennes #249

Updated to Swift 5.
Jungwon An #268

Source code(tar.gz)
Source code(zip)
0.13.1(Aug 16, 2020)
Bug Fixes

Fixed a bug in Stencil 0.13 where tags without spaces were incorrectly parsed.
David Jennes #252

Source code(tar.gz)
Source code(zip)
0.13.0(Sep 25, 2018)
Breaking

Now requires Swift 4.1 or newer.
Yonas Kolb #228

Enhancements

You can now use parentheses in boolean expressions to change operator precedence.
Ilya Puchka #165

Added method to add boolean filters with their negative counterparts.
Ilya Puchka #160

Now you can conditionally render variables with {{ variable if condition }}, which is a shorthand for {% if condition %}{{ variable }}{% endif %}. You can also use else like {{ variable1 if condition else variable2 }}, which is a shorthand for {% if condition %}{{ variable1 }}{% else %}{{ variable2 }}{% endif %}
Ilya Puchka #243

Now you can access string characters by index or get string length the same was as if it was an array, i.e. {{ 'string'.first }}, {{ 'string'.last }}, {{ 'string'.1 }}, {{ 'string'.count }}.
Ilya Puchka #245

Bug Fixes

Fixed the performance issues introduced in Stencil 0.12 with the error log improvements.
Ilya Puchka #230

Now accessing undefined keys in NSObject does not cause runtime crash and instead renders empty string.
Ilya Puchka #234

for tag: When iterating over a dictionary the keys will now always be sorted (in an ascending order) to ensure consistent output generation.
David Jennes #240

Internal Changes

Updated the codebase to use Swift 4 features.
David Jennes #239

Update to Spectre 0.9.0.
Ilya Puchka #247

Optimise Scanner performance.
Eric Thorpe Sébastien Duperron David Jennes #226

Source code(tar.gz)
Source code(zip)
0.12.1(Aug 30, 2018)
Internal Changes

Updated the PathKit dependency to 0.9.0 in CocoaPods, to be in line with SPM.
David Jennes #227

Source code(tar.gz)
Source code(zip)
0.12.0(Aug 26, 2018)
Enhancements

Added an optional second parameter to the include tag for passing a sub context to the included file.
Yonas Kolb #214

Variables now support the subscript notation. For example, if you have a variable key = "name", and an object item = ["name": "John"], then {{ item[key] }} will evaluate to "John".
David Jennes #215

Adds support for using spaces in filter expression.
Ilya Puchka #178

Improvements in error reporting.
Ilya Puchka #167

Bug Fixes

Fixed using quote as a filter parameter.
Ilya Puchka #210

Source code(tar.gz)
Source code(zip)
0.11.0(Apr 5, 2018)
Enhancements

Added support for resolving superclass properties for not-NSObject subclasses

The {% for %} tag can now iterate over tuples, structures and classes via their stored properties.

Added split filter

Allow default string filters to be applied to arrays

Similar filters are suggested when unknown filter is used

Added indent filter

Allow using new lines inside tags

Added support for iterating arrays of tuples

Added support for ranges in if-in expression

Added property forloop.length to get number of items in the loop

Now you can construct ranges for loops using a...b syntax, i.e. for i in 1...array.count

Bug Fixes

Fixed rendering {{ block.super }} with several levels of inheritance

Fixed checking dictionary values for nil in default filter

Fixed comparing string variables with string literals, in Swift 4 string literals became Substring and thus couldn't be directly compared to strings.

Integer literals now resolve into Int values, not Float

Fixed accessing properties of optional properties via reflection

No longer render optional values in arrays as Optional(..)

Fixed subscription tuples by value index, i.e. {{ tuple.0 }}

Source code(tar.gz)
Source code(zip)
0.10.1(Nov 17, 2017)
Enhancements

Add support for Xcode 9.1.

Source code(tar.gz)
Source code(zip)
0.10.0(Oct 28, 2017)
Enhancements

Adds counter0 to for loop context allowing you to get the current index of the for loop 0 indexed.

Introduces a new DictionaryLoader for loading templates from a Swift Dictionary.

Added in expression in if tag for strings and arrays of hashable types

You can now access the amount of items in a dictionary using the count property.

Bug Fixes

Fixes a potential crash when using the {% for %} template tag with the incorrect amount of arguments.

Fixes a potential crash when using incomplete tokens in a template for example, {%%} or {{}}.

Fixes evaluating nil properties as true

Source code(tar.gz)
Source code(zip)
0.9.0(Apr 18, 2017)
Enhancements

for block now can contain where expression to filter array items. For example {% for item in items where item > 1 %} is now supported.

if blocks may now contain else if (elif) conditions.

{% if one or two and not three %} one or two but not three {% elif four %} four {% else %} not one, two, or four {% endif %}

for block now allows you to iterate over array of tuples or dictionaries.

{% for key, value in thing %} <li>{{ key }}: {{ value }}</li> {% endfor %}

Bug Fixes

You can now use literal filter arguments which contain quotes. #98

Source code(tar.gz)
Source code(zip)
0.8.0(Feb 18, 2017)
Breaking

It is no longer possible to create Context objects. Instead, you can pass a dictionary directly to a Templates render method.

- try template.render(Context(dictionary: ["name": "Kyle"])) + try template.render(["name": "Kyle"])

Template loader are no longer passed into a Context, instead you will need to pass the Loader to an Environment and create a template from the Environment.

let loader = FileSystemLoader(paths: ["templates/"]) - let template = loader.loadTemplate(name: "index.html") - try template.render(Context(dictionary: ["loader": loader])) + let environment = Environment(loader: loader) + try environment.renderTemplate(name: "index.html")

Loaders will now throw a TemplateDoesNotExist error when a template is not found.

Namespace has been removed and replaced by extensions. You can create an extension including any custom template tags and filters. A collection of extensions can be passed to an Environment.

Enhancements

Environment is a new way to load templates. You can configure an environment with custom template filters, tags and loaders and then create a template from an environment.

Environment also provides a convenience method to render a template directly.

FileSystemLoader will now ensure that template paths are within the base path. Any template names that try to escape the base path will raise a SuspiciousFileOperation error.

New {% filter %} tag allowing you to perform a filter across the contents of a block.

{% filter lowercase %} This Text Will Be Lowercased. {% endfilter %}

You can now use {{ block.super }} to render a super block from another {% block %}.

Environment allows you to provide a custom Template subclass, allowing new template to use a specific subclass.

If expressions may now contain filters on variables. For example {% if name|uppercase == "TEST" %} is now supported.

Deprecations

Template initialisers have been deprecated in favour of using a template loader such as FileSystemLoader inside an Environment.

The use of whitespace inside variable filter expression is now deprecated.

- {{ name | uppercase }} + {{ name|uppercase }}

Bug Fixes

Restores compatibility with ARM based platforms such as iOS. Stencil 0.7 introduced compilation errors due to using the Float80 type which is not available.

Source code(tar.gz)
Source code(zip)
0.7.1(Nov 30, 2016)
Bug Fixes

Fixes an issue where using {% if %} statements which use operators would throw a syntax error.

Source code(tar.gz)
Source code(zip)
0.7.0(Nov 29, 2016)
New documentation website: https://stencil.fuller.li

Breaking

TemplateLoader has been renamed to FileSystemLoader. The loadTemplate(s) methods are now throwing and now take labels for the name and names arguments.

Many internal classes are no longer public. Some APIs were previously accessible due to earlier versions of Swift requiring the types to be public to be able to test. Now we have access to @testable these can correctly be private.

{% ifnot %} tag is now deprecated, please use {% if not %} instead.

Enhancements

Variable lookup now supports introspection of Swift types. You can now lookup values of Swift structures and classes inside a Context.

If tags can now use prefix and infix operators such as not, and, or, ==, !=, >, >=, < and <=.

{% if one or two and not three %}

You may now register custom template filters which make use of arguments.

There is now a default filter.

Hello {{ name|default:"World" }}

There is now a join filter.

{{ value|join:", " }}

{% for %} tag now supports filters.

{% for user in non_admins|default:admins %} {{ user }} {% endfor %}

Bug Fixes

Variables ({{ variable.5 }}) that reference an array index at an unknown index will now resolve to nil instead of causing a crash. #72

Templates can now extend templates that extend other templates. #60

If comparisons will now treat 0 and below numbers as negative.

Source code(tar.gz)
Source code(zip)
0.6.0(Sep 13, 2016)
Enhancements

Adds support for Swift 3.0.

Source code(tar.gz)
Source code(zip)
0.6.0-beta.1(Apr 4, 2016)
Enhancements

Namespaces are now included in contexts so that template tags can make use of the namespace and pass it down to subsequent temples.

Source code(tar.gz)
Source code(zip)
0.5.3(Feb 26, 2016)
Bug Fixes

Fixes issues resolving variables on Linux.

Source code(tar.gz)
Source code(zip)
0.5.1(Dec 8, 2015)
Bug Fixes

Fixes an issue where the SPM dependency on PathKit wouldn't have Linux support.

Source code(tar.gz)
Source code(zip)
0.5.0(Dec 8, 2015)
Breaking Change

This version moves filters and tags to "namespaces", please consult the README for more information.

Enhancements

Stencil can now be used with the Swift Package Manager (SPM).

Stencil now support Linux.

Source code(tar.gz)
Source code(zip)
0.4.0(Oct 30, 2015)
Enhancements

This version of Stencil introduces template filters, allowing you to transform a variable.

{{ variable|uppercase }}

Source code(tar.gz)
Source code(zip)
0.3.0(Oct 26, 2015)

This release adds Swift 2.0 support along with changing the complete API so that instead of returning a Result-like type, we will either throw or return the appropriate value.
Source code(tar.gz)
Source code(zip)
0.2.0(Oct 26, 2015)
This release adds support for Swift 1.2.

Enhancements

Adds the following template tags used for inheritance:

{% include "foo.html" %}

{% extends "base.html" %}

Source code(tar.gz)
Source code(zip)
0.1.1(Oct 26, 2015)
Adds support for running Stencil from Objective-C.

Source code(tar.gz)
Source code(zip)
0.1.0(Oct 26, 2015)

Initial release.
Source code(tar.gz)
Source code(zip)

Owner

Stencil Project

GitHub Organization to host the Stencil project, a Swift library to render jinja-like templates

GitHub https://stencil.fuller.li

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Stencil is a simple and powerful template language for Swift.

Related tags

Overview

Stencil

Example

Philosophy

The User Guide

Projects that use Stencil

License

Comments

Releases(0.15.1)

0.15.1(Jul 31, 2022)

Bug Fixes

0.15.0(Jul 29, 2022)

Breaking

Enhancements

Bug Fixes

Internal Changes

0.14.2(Nov 3, 2021)

Internal Changes

0.14.1(Apr 11, 2021)

Bug Fixes

0.14.0(Aug 17, 2020)

Breaking

Enhancements

Deprecations

Bug Fixes

Internal Changes

0.13.1(Aug 16, 2020)

Bug Fixes

0.13.0(Sep 25, 2018)

Breaking

Enhancements

Bug Fixes

Internal Changes

0.12.1(Aug 30, 2018)

Internal Changes

0.12.0(Aug 26, 2018)

Enhancements

Bug Fixes

0.11.0(Apr 5, 2018)

Enhancements

Bug Fixes

0.10.1(Nov 17, 2017)

Enhancements

0.10.0(Oct 28, 2017)

Enhancements

Bug Fixes

0.9.0(Apr 18, 2017)

Enhancements

Bug Fixes

0.8.0(Feb 18, 2017)

Breaking

Enhancements

Deprecations

Bug Fixes

0.7.1(Nov 30, 2016)

Bug Fixes

0.7.0(Nov 29, 2016)

Breaking

Enhancements

Bug Fixes

0.6.0(Sep 13, 2016)

Enhancements

0.6.0-beta.1(Apr 4, 2016)

Enhancements

0.5.3(Feb 26, 2016)

Bug Fixes

0.5.1(Dec 8, 2015)

Bug Fixes

0.5.0(Dec 8, 2015)

Breaking Change

Enhancements

0.4.0(Oct 30, 2015)

Enhancements

0.3.0(Oct 26, 2015)

0.2.0(Oct 26, 2015)

Enhancements

0.1.1(Oct 26, 2015)

0.1.0(Oct 26, 2015)