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44 lines
1.1 KiB
Elixir
44 lines
1.1 KiB
Elixir
defmodule PhilomenaQuery.Parse.FloatParser do
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@moduledoc false
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import NimbleParsec
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defp to_number(input), do: PhilomenaQuery.Parse.Helpers.to_number(input)
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defp range(input), do: PhilomenaQuery.Parse.Helpers.range(input)
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space =
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choice([string(" "), string("\t"), string("\n"), string("\r"), string("\v"), string("\f")])
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|> ignore()
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fuzz =
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string("~")
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|> ignore()
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unsigned_float =
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ascii_string([?0..?9], min: 1)
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|> optional(ascii_char(~c".") |> ascii_string([?0..?9], min: 1))
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|> reduce({List, :to_string, []})
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|> reduce(:to_number)
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float =
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optional(ascii_char(~c"-+"))
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|> ascii_string([?0..?9], min: 1)
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|> optional(ascii_char(~c".") |> ascii_string([?0..?9], min: 1))
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|> reduce({List, :to_string, []})
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|> reduce(:to_number)
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float_parser =
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choice([
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float
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|> concat(fuzz)
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|> concat(unsigned_float)
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|> reduce(:range)
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|> unwrap_and_tag(:float_range),
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float |> unwrap_and_tag(:float)
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])
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|> repeat(space)
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|> eos()
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|> label("a real number, like `2.7182818' or `-10'")
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defparsec(:parse, float_parser)
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end
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