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https://github.com/dskinner/damsel

Package damsel provides html outlining via css-selectors and common template functionality.
https://github.com/dskinner/damsel

Last synced: 7 months ago
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Package damsel provides html outlining via css-selectors and common template functionality.

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README 

          
# Damsel [![GoDoc](https://godoc.org/dasa.cc/damsel?status.svg)](https://godoc.org/dasa.cc/damsel) [![Build Status](https://drone.dasa.cc/api/badges/dskinner/damsel/status.svg)](https://drone.dasa.cc/dskinner/damsel)



Markup language featuring html outlining via css-selectors, extensible via pkg html/template and others.



## Library



This package expects to exist at `$GOPATH/src/dasa.cc/damsel` and can be installed with:



```

go get dasa.cc/damsel

```



## Command Line



A command line utility can be installed with:



```

go get dasa.cc/damsel/cmd/damsel

```



View help with:



```

damsel -h

```



## Documentation



http://godoc.org/dasa.cc/damsel



Package damsel provides html outlining via css-selectors and common template functionality.



### Tags



Tags are specified with %tag, #id, .class where #id and .class become a div

if no %tag is specified. Multiple classes can be specified but only one #id

tag should be specified for an element. It's also important that an #id tag

is unique in the document as damsel facilitates overriding content of a

document via an #id tag.



	%html %body

	  #content.border Hello, World

	  %div.one.two.three



### Attributes



Attributes can be inlined, line-breaked, or a combination of such. Provide

quotes around the attribute value to escape brackets.



	%html %body



	  %div[a=1][b=2]



	  #foo

	    [a="1[1]"]

	    [b="2[2]"]



	  #bar[a=1][b=2]

	      [c=3][d=4]



	  %span[a][b] Attributes do not require values



### Text and Whitespace



Whitespace can be manipulated as described below, but it's worth pointing out that

large amounts of content are simply not suitable for such document types (Damsel, Haml, etc).



	%p One

	  \ Two

	  \ Three



	%p    One Two Three



Both paragraphs will be rendered the same. Use of a backslash controls

whitespace, including inlined text.



	%p \ One Two Three



This would insert a space before One.



Whitespace can be preserved using `



	%p `this is some

	text and all whitespace

	    is preserved as-is`



### HTML Comments



Supports commenting out blocks of code via html comments with optional

text and browser specfic IFs. This also includes DOCTYPE declarations.



	!DOCTYPE html

	%html %body

	  ! %ul

	    %li 1

	    %li 2



The use of ! as a block element, causing %ul to become inlined, will cause the

entire block to become commented out. The ! could also be placed after the

body tag in this case. You can also nest items under a comment.



	%html %body

	  ! here's a comment though it's not required

	    %h1 Hello World



	  %div

	    ! this comment doesn't enclose any tags

	    %span Hello World



	  ![if IE] %p Internet Explorer



### Actions



There is basic support for actions. An action is just another way of calling a function

while also preserving indention of the inner content lines, making this suitable for

parsing other indention based markup. Once an action has been processed, the lexer will parse

the result as though it was part of the original document.



In time, this package will facilitate custom functions. Currently

included actions are js, css, include, and extends.



	%html %head

	  :css /css/

	    main.css

	    extra.css



This would generate the following document.



	%html %head

	  %link[type=text/css][rel=stylesheet][href=/css/main.css]

	  %link[type=text/css][rel=stylesheet][href=/css/extra.css]



### Reusable Templates



Damsel allows any element with an id specified to be overridden. Also required

is at least one root node that will serve as the main document output.

Additional root nodes are checked against the first for overridable content.



	%html %body

	  #content

	    %p Hello



	#content OVERRIDE



The would produce the following output.



	

	  
OVERRIDE


	



This functionality is also facilitated with the action extends.



	:extends overlay.dmsl



	#content OVERRIDE



If you wish to append child nodes instead of overriding the original content, specify a super attribute.



	:extends overlay.dmsl



	#content[super]

	  %p A second paragraph



The action include uses the whitespace preceding its declaration to insert

content from a separate document into the current. For example, given the

following document:



	%ul

	  %li One

	  %li Two



included in the following document:



	%html %body

	  #content

	    %h1 My Numbers

	    :include numbers.dmsl



would produce the following document:



	%html %body

	  #content

	    %h1 My Numbers

	    %ul

	      %li One

	      %li Two



### Other Template Integration



This package should be ok for use with most text templating options. Helpers

that provide integration with html/template take the following steps.



	- Call dmsl/parse.ActionParse(b []byte)

	- Pass the result to package html/template and execute

	- Call dmsl/parse.DocParse(b []byte)

	- Display result



Calling dmsl.NewHtmlTemplate will return an instance that parses actions and passes the result

to html/template.Template. Call Execute(interface{}) to produce the final result. For example, given [10][10]int:



	%html %body

	  %table {range .}

	    %tr {range .}

	      %td {.}

	{end}{end}



At one-point the {end} was optional with deeper integration of html/template, but in practice this created

confusion and errors except for the most trivial of examples (above).



Here's another example.



	%html %body

	  %table

	  {range .}



	    {if .}



	    %tr

	    {range .}

	      %td {.}

	    {end}



	    {else}

	    %tr %td None

	    {end}



	    %p some trailing text

	  {end}