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A component based library for Phoenix LiveView
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lib/surface/formatter/phases/block_exceptions.ex
defmodule Surface.Formatter.Phases.BlockExceptions do
@moduledoc """
Handle exceptional case for blocks.
""" && false
@behaviour Surface.Formatter.Phase
alias Surface.Formatter.Phase
def run(nodes, _opts) do
Phase.transform_elements_and_descendants(nodes, &transform_block/1)
end
def transform_block({:block, "case", expr, sub_blocks, %{has_sub_blocks?: true} = meta}) do
# "case" is a special case because its sub blocks are indented, unlike `if`
# and `for`; therefore, the last `:indent_one_less` needs to be removed from
# the last sub-block and moved to the outer block.
#
# This code is a bit hacky but kept the rest of the architecture simpler.
reversed_sub_blocks = Enum.reverse(sub_blocks)
[last_sub_block | rest] = reversed_sub_blocks
{:block, "match", match_expr, children, last_meta} = last_sub_block
modified_sub_blocks = [
{:block, "match", match_expr, Enum.slice(children, 0..-2), last_meta} | rest
]
modified_sub_blocks = Enum.reverse(modified_sub_blocks)
{:block, "case", expr, [:newline, :indent | modified_sub_blocks] ++ [:indent_one_less], meta}
end
def transform_block(node), do: node
end