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floki
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Floki is a simple HTML parser that enables search for nodes using CSS selectors.
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lib/floki/filter_out.ex
defmodule Floki.FilterOut do
@moduledoc false
alias Floki.{HTMLTree, Finder}
# Helper functions for filtering out a specific element from the tree.
@type html_tree :: tuple | list
@type selector :: :comment | Finder.selector()
@spec filter_out(html_tree, selector) :: tuple | list
def filter_out(html_tree, :comment) do
mapper(html_tree, :comment)
end
def filter_out(html_tree, selector) do
case Finder.find(html_tree, selector) do
{:empty_tree, _} ->
html_tree
{tree, results} ->
new_tree =
Enum.reduce(results, tree, fn html_node, tree ->
HTMLTree.delete_node(tree, html_node)
end)
html_as_tuples =
new_tree.root_nodes_ids
|> Enum.reverse()
|> Enum.map(fn node_id ->
root = Map.get(new_tree.nodes, node_id)
HTMLTree.to_tuple(new_tree, root)
end)
case html_tree do
tree when is_tuple(tree) ->
first_tuple(html_as_tuples)
trees when is_list(trees) ->
html_as_tuples
end
end
end
defp first_tuple([]), do: []
defp first_tuple([head | _rest]), do: head
defp filter({nodetext, _, _}, selector) when nodetext === selector, do: false
defp filter({nodetext, _}, selector) when nodetext === selector, do: false
defp filter(_, _), do: true
defp mapper(nodes, selector) when is_list(nodes) do
nodes
|> Stream.filter(&filter(&1, selector))
|> Stream.map(&mapper(&1, selector))
|> Enum.to_list()
end
defp mapper({nodetext, x, y}, selector) do
{nodetext, x, mapper(y, selector)}
end
defp mapper(nodetext, _), do: nodetext
end