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Only regenerate parser if grammar has changed #158

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Merged
merged 1 commit into from
Oct 31, 2019
Merged

Only regenerate parser if grammar has changed #158

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23 changes: 21 additions & 2 deletions tasks/compile.peg.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,27 @@ defmodule Mix.Tasks.Compile.Peg do
:slime, :attr_list_delims, %{"[" => "]", "(" => ")", "{" => "}"}
)
grammar = EEx.eval_file("src/slime_parser.peg.eex", attr_list_delims: attr_list_delims)
File.write!("src/slime_parser.peg", grammar)
peg = "src/slime_parser.peg" |> Path.expand |> String.to_charlist

if contents_changed?("src/slime_parser.peg", grammar) do
compile_grammar("src/slime_parser.peg", grammar)
else
:ok
end
end

defp contents_changed?(file, expected) do
case File.read(file) do
{:ok, contents} ->
contents != expected

_ ->
true
end
end

defp compile_grammar(file, grammar) do
File.write!(file, grammar)
peg = file |> Path.expand |> String.to_charlist
case :neotoma.file(peg, transform_module: :slime_parser_transform) do
:ok -> :ok
{:error, reason} ->
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