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A Excel like expression parser, compatible with FLOIP Expression language.
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lib/literal_helpers.ex
defmodule Expression.LiteralHelpers do
@moduledoc false
import NimbleParsec
def int do
optional(string("-"))
|> times(
choice([
integer(min: 1),
ignore(utf8_char([?_]))
]),
min: 1
)
|> reduce({Enum, :join, [""]})
|> map({String, :to_integer, []})
end
def float do
optional(string("-"))
|> concat(utf8_string([?0..?9], min: 1))
|> concat(string("."))
|> concat(utf8_string([?0..?9], min: 1))
|> reduce({Enum, :join, [""]})
|> map({String, :to_float, []})
end
def numeric do
choice([int(), float()])
end
def single_quoted_string do
ignore(ascii_char([?']))
|> repeat_while(
choice([
string(~S(\')) |> replace(?'),
utf8_char([])
]),
{:not_single_quote, []}
)
|> ignore(ascii_char([?']))
|> reduce({List, :to_string, []})
end
def double_quoted_string do
ignore(ascii_char([?"]))
|> repeat_while(
choice([
string(~S(\")) |> replace(?"),
utf8_char([])
]),
{:not_double_quote, []}
)
|> ignore(ascii_char([?"]))
|> reduce({List, :to_string, []})
end
def not_double_quote(<<?", _::binary>>, context, _, _), do: {:halt, context}
def not_double_quote(_, context, _, _), do: {:cont, context}
def not_single_quote(<<?', _::binary>>, context, _, _), do: {:halt, context}
def not_single_quote(_, context, _, _), do: {:cont, context}
end