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41 lines
975 B
Elixir
41 lines
975 B
Elixir
defmodule Textile.Helpers do
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import NimbleParsec
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# Helper to "undo" a tokenization and convert it back
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# to a string
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def unwrap([{_name, value}]), do: value
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# Lots of extra unicode space characters
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def space do
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choice([
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utf8_char('\n\r\f \t\u00a0\u1680\u180e\u202f\u205f\u3000'),
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utf8_char([0x2000..0x200a])
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])
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end
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# Characters which are valid before and after the main markup characters.
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def special_characters do
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choice([
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space(),
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utf8_char('#$%&(),./:;<=?\\`|\'')
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])
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end
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# Simple tag for a markup element that must
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# be succeeded immediately by a non-space character
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def markup_open_tag(str, char \\ nil, tag_name) do
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char = char || binary_head(str)
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open_stops =
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choice([
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space(),
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string(char)
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])
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string(str)
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|> lookahead_not(open_stops)
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|> unwrap_and_tag(:"#{tag_name}_open")
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end
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defp binary_head(<<c::utf8, _rest::binary>>), do: <<c::utf8>>
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end
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