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lib/ex_ast/sigil.ex
defmodule ExAST.Sigil do
@moduledoc """
Provides the `~p` sigil for compile-time pattern parsing.
import ExAST.Sigil
~p"IO.inspect(expr, ...)"
~p"def foo(_) do ... end"
~p"{:ok, result}"
The sigil parses the pattern string at compile time into an AST,
avoiding runtime parsing overhead. The result can be passed to
any function that accepts a pattern.
"""
@doc """
Parses a pattern string into AST at compile time.
## Examples
iex> import ExAST.Sigil
iex> ~p"IO.inspect(_)"
{{:., [line: 1], [{:__aliases__, [line: 1], [:IO]}, :inspect]}, [line: 1], [{:_, [line: 1], nil}]}
"""
defmacro sigil_p({:<<>>, _, [string]}, _modifiers) when is_binary(string) do
pattern = Code.string_to_quoted!(string)
Macro.escape(pattern)
end
end