@ui-doc/html-renderer

v0.2.0

Published

11 days ago

HTML renderer for UI-Doc.

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gherrink

ui-doc styleguide ui-kit documentation generation renderer html

UI-Doc HTML Renderer

Simple and light HTML Rendering Engine. Its purpose is to create HTML from a Context Object by using a simple template syntax and have no dependencies. This project should not be used for complexer projects, because of it's simplicity.

Tags

Tags are used to get a bit of functionality into the html generation process.

var

Output value of a variable.

<h1>{{var:title}}</h1>

To escape the variable use {{var:title escape}}.

if

Use a if condition to decide when our when not to render something. Please not that currently there is no else or ifelse

{{if:show}}
<p>Show this if show inside the context is a true statement</p>
{{/if}}

Conditions

You can use conditions

{{if:title === "foo"}}
{{if:show === true}}
{{if:page.number === 3}}

Operators:

===
==
!==
!=
<
<=
>
>=

for

Use for to loop over objects and arrays. Please not that a loop will change the context to help you access inside your loop target and give you loop specific context like index and object keys.

array loop

<!-- context: {"list": ["foo", "bar", "baz"]} -->
<ul>
  {{for:list}}
  <li>{{var:_loop.value}}, index: {{var:_loop.index}}</li>
  {{/for}}
</ul>

<!-- Output: -->
<ul>
  <li>foo, index: 0</li>
  <li>bar, index: 1</li>
  <li>baz, index: 2</li>
</ul>

object loop

<!-- context: {"list": {"foo": "FOO", "bar": "BAR", "baz": "BAZ"}} -->
<ul>
  {{for:list}}
  <li>{{var:_loop.value}}, key: {{var:_loop.key}}, index: {{var:_loop.index}}</li>
  {{/for}}
</ul>

<!-- Output: -->
<ul>
  <li>FOO, key: foo, index: 0</li>
  <li>BAR, key: bar, index: 1</li>
  <li>BAZ, key: baz, index: 2</li>
</ul>

loop items as objects

You can loop over an array or object of objects. The object items will directly be accessible inside the for context.

<!-- context: {"sections": [{"title": "Section 1", content: "<p>Section 1 content</p>"}, {"title": "Section 2", content: "<p>Section 2 content</p>"}]} -->

{{for:sections}}
<section>
  <h2>{{var::title}}</h2>
  {{var:content}}
</section>
{{/for}}

<!-- Output: -->
<section>
  <h2>Section 1</h2>
  <p>Section 1 content</p>
</section>
<section>
  <h2>Section 2</h2>
  <p>Section 2 content</p>
</section>

page

Use page to output registered page templates (see Templates > Page). {{page:foo}} this will try to render the foo page. If no page with this name is registered the system will fallback to the default page. If you want to use the default page you can also just use {{page}}. As second parameter you can give a context if you like to change the context {{page:layout newContext}}.

<!-- context: {"title": "Document Title", "page": {"title": "Page title", "content": "Page content"}} -->

<html>
<head>
  <title>{{var:title}}</title>
</head>
<body>
  <!-- using default layout with new context `page` -->
  {{page:default page}}
</body>
</html>

<!-- default page template with change context -->
<!-- context: {"title": "Page title", "content": "Page content"} -->

<main>
  <h1>{{var:title}}</h1>
  <p>{{var:content}}</p>
</main>

<!-- Output: -->
<html>
<head>
  <title>Document Title</title>
</head>
<body>
<main>
  <h1>Page title</h1>
  <p>Page content</p>
</main>
</body>
</html>

partial

Use partial to render registered partial templates (see Templates > Partial). If the given partial name was not found nothing will be generated

{{partial:foo}} > output foo partial

As second parameter you can give a context definition to change the context

{{partial:foo bar}} > output foo partial using bar of the current context as new context

debug

Use debug to output the current context or parts of the context. The context will be outputted as JSON.

<!-- context: {"title": "Document Title", "page": {"title": "Page title", "content": "Page content"}} -->

{{debug}}
<!-- Output: -->
{"title": "Document Title", "page": {"title": "Page title", "content": "Page content"}}

{{debug:page}}
<!-- Output: -->
{"title": "Page title", "content": "Page content"}

Templates

You can register different template parts to the renderer these templates can then be reused wile generation.

Layouts

Define the HTML basic structure.

Page

Define a page specific template. You can use the {{page:your-page-template-name}} tag to render a specific page template. Page templates are not necessary but they help to keep layouts smaller and easier to read.

Partial

Define a partial that can be reused, to get the same output inside layouts, pages and even in other partials. You can use the {{partial:your-partial-name}} tag to render the partial.

Usage

import { HtmlRenderer } from '@ui-doc/html-renderer'

const layout = `
<html>
  <head>
    <meta charset="utf-8">
    <title>{{var:title}}</title>
  </head>
  <body>
    {{page:default}}
  </body>
</html>`

const page = `
<h1>{{var:title}}</h1>

{{if:excerpt}}
<div>{{var:excerpt}}</div>
{{/if}}

{{for:sections}}
{{partial:section}}
{{/for}}`

const section = `
<h2>{{var:title}}</h2>

{{var:content}}
`

const renderer = new HtmlRenderer()

renderer.addLayout('default', layout)
renderer.addPage('default', page)
renderer.addPartial('section', section)

renderer.generate({
  title: 'Example',
  page: {
    title: 'Example Page Title',
    sections: [
      {; content: "<p>Section 1 content</p>" },
      {; title: "Section 2"; content: "<p>Section 2 content</p>" },
    ],
  },
})