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semantic/src/Range.hs

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module Range where
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import qualified Data.Char as Char
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data Range = Range { start :: Int, end :: Int }
deriving (Eq, Show)
substring :: Range -> String -> String
substring range = take (end range - start range) . drop (start range)
totalRange :: [a] -> Range
totalRange list = Range 0 $ length list
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offsetRange :: Int -> Range -> Range
offsetRange i (Range start end) = Range (i + start) (i + end)
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rangesOfWordsFrom :: Int -> String -> [Range]
rangesOfWordsFrom startIndex string = case break Char.isSpace string of
([], []) -> []
([], rest) -> rangesOfWordsAfterWhitespace startIndex rest
(word, []) -> [ Range startIndex $ length word ]
(word, rest) -> (Range startIndex $ length word) : rangesOfWordsAfterWhitespace (startIndex + length word) rest
where
rangesOfWordsAfterWhitespace startIndex string | (whitespace, rest) <- break (not . Char.isSpace) string = rangesOfWordsFrom (startIndex + length whitespace) rest
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instance Ord Range where
a <= b = start a <= start b