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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/eex_iolist_engine.ex
defmodule EventStore.EExIOListEngine do
@moduledoc false
@behaviour EEx.Engine
def init(_opts) do
%{iodata: [], dynamic: [], vars_count: 0}
end
def handle_begin(state) do
%{state | iodata: [], dynamic: []}
end
def handle_end(quoted) do
handle_body(quoted)
end
def handle_body(state) do
%{iodata: iodata, dynamic: dynamic} = state
iodata = Enum.reverse(iodata)
{:__block__, [], Enum.reverse([iodata | dynamic])}
end
# Required for Elixir versions older than v1.12.0
def handle_text(state, text) do
handle_text(state, [], text)
end
def handle_text(state, _meta, text) do
%{iodata: iodata} = state
%{state | iodata: [text | iodata]}
end
def handle_expr(state, "=", ast) do
%{iodata: iodata, dynamic: dynamic, vars_count: vars_count} = state
var = Macro.var(:"arg#{vars_count}", __MODULE__)
ast =
quote do
unquote(var) = String.Chars.to_string(unquote(ast))
end
%{state | dynamic: [ast | dynamic], iodata: [var | iodata], vars_count: vars_count + 1}
end
def handle_expr(state, "", ast) do
%{dynamic: dynamic} = state
%{state | dynamic: [ast | dynamic]}
end
def handle_expr(state, marker, ast) do
EEx.Engine.handle_expr(state, marker, ast)
end
end