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A component based library for Phoenix LiveView
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lib/surface/formatter/phases/newlines.ex
defmodule Surface.Formatter.Phases.Newlines do
@moduledoc """
Standardizes usage of newlines.
- Prevents more than 1 empty line in a row.
- Prevents an empty line separating an opening/closing tag from the contents inside.
""" && false
@behaviour Surface.Formatter.Phase
alias Surface.Formatter.Phase
def run(nodes, _opts) do
nodes
|> collapse_newlines()
|> prevent_empty_line_at_beginning()
|> prevent_empty_line_at_end()
end
defp collapse_newlines(nodes) do
nodes
|> Enum.chunk_by(&(&1 == :newline))
|> Enum.map(fn
[:newline, :newline | _] -> [:newline, :newline]
nodes -> nodes
end)
|> Enum.flat_map(&Function.identity/1)
|> Phase.transform_element_children(&collapse_newlines/1)
end
defp prevent_empty_line_at_beginning(nodes) do
nodes
|> case do
[:newline, :newline | rest] -> [:newline | rest]
_ -> nodes
end
|> Phase.transform_element_children(&prevent_empty_line_at_beginning/1)
end
defp prevent_empty_line_at_end(nodes) do
nodes
|> Enum.slice(-2..-1)
|> case do
[:newline, :newline] -> Enum.slice(nodes, 0..-2)
_ -> nodes
end
|> Phase.transform_element_children(&prevent_empty_line_at_end/1)
end
end