sketch for a django template autoformatter

hmm.txt

<img src="...">
<img {{ variable }}>
<img {{ variable }}="...">
<img {% tag %}>
<img {% if variable %}attr="..."{% else %}attr=",,,"{% endif %}>
<img src="{{ variable }}">
<img src="{% tag %}">
<img src="{% if variable %}...{% else %}...{% endif %}">
<img class="className {% if variable %}freddo{% else %}greggo{% endif %} meowMeow">


type Token
	= StartTag List[Attributes]
	| EndTag
	| Expression
	| DjangoSoloTag
	| DjangoBlockTag
	| DjangoBlockEndTag

type StartTag = String, Attribute[]

type Attribute = (AttrName, AttrValue[]) | AttrName
type AttrName = String | Expression | DjangoSoloTag | DjangoBlockTag
type AttrValue = String | Expression | DjangoSoloTag | DjangoBlockTag

type DjangoBlockTag = IfBlock | Block
type Block = {
	open: String,
	end: String,
	children: Token[]
}
type IfBlock = IfClause[]
type IfClause = (Expression, Token[])




<img class="className {% if variable %}freddo{% elif var2 %}narco{% else %}greggo{% endif %} meowMeow">

OpenTag "img"
AttributeName "class"
StartAttributeValue
String "className "
DjangoBlock "if variable"
String "freddo"
DjangoBlock "elif var2"
String "narco"
DjangoBlock "else"
String "greggo"
DjangoBlock " meowMeow"
EndAttributeValue


StartTag {
	"img", [
		"class", [
			"className ",
			IfBlock [
				("variable", "freddo"),
				("var2", "narco"),
				("1", "greggo")
			],
			" meowMeow",
		]
	]
}