This module define behaviour for tags.

To implement new tag you need to create new module that implement the Tag behaviour:

defmodule MyCustomTag do
  import NimbleParsec
  @behaviour Solid.Tag

  @impl true
  def spec(_parser) do
    space = Solid.Parser.Literal.whitespace(min: 0)

    ignore(string("{%"))
    |> ignore(space)
    |> ignore(string("my_tag"))
    |> ignore(space)
    |> ignore(string("%}"))
  end

  @impl true
  def render(_tag, _context, _options) do
    [text: "my first tag"]
  end
end

• spec define how to parse your tag
• render define how to render your tag

Then add the tag to your parser

defmodule MyParser do
  use Solid.Parser.Base, custom_tags: [MyCustomTag]
end

Then pass the custom parser as option

"{% my_tag %}"
|> Solid.parse!(parser: MyParser)
|> Solid.render()

Control flow tags can change the information Liquid shows using programming logic.

More info: https://shopify.github.io/liquid/tags/control-flow/