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he9lin/interpolation.exs

Last active January 8, 2017 04:37
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interpolation.exs
defmodule Interpolation do
def call(string, bindings \\ []) do
~r/(?<head>)%{[^}]+}(?<tail>)/
|> Regex.split(string, on: [:head, :tail])
|> Enum.reduce("", fn
<<"%{" <> rest>>, acc ->
key = String.to_atom(String.rstrip(rest, ?}))
acc <> to_string(Dict.fetch!(bindings, key))
segment, acc ->
acc <> segment
end)
end
end
"Hello, world"
|> Interpolation.call
|> IO.puts
"Hello, %{first} %{last}"
|> Interpolation.call(first: "Lin", last: "He")
|> IO.puts
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