UMinho Haskell Libraries (1.0) Contents Index

Data.Relation.Read Portability portable Stability experimental Maintainer joost.visser@di.uminho.pt

Contents Parsing spreadsheet-like input files. Convert to relations. Auxiliaries

Description

Reading relations from files.

Synopsis

readMatrix :: Char -> Int -> FilePath -> IO [[String]] tokenizeBy :: (Char -> Bool) -> String -> [String] matrixToRel :: [[String]] -> Rel String (String, Int) rowToRel :: Rel String (String, Int) -> [String] -> Rel String (String, Int) type FilterMask = [Bool] filterWithMask :: FilterMask -> [x] -> [x] valueSets :: Ord a => [Set a] -> [[a]] -> [Set a]

Parsing spreadsheet-like input files.

readMatrix :: Char -> Int -> FilePath -> IO [[String]]

tokenizeBy :: (Char -> Bool) -> String -> [String]

Tokenize an input lines by a given separator character predicate.

Convert to relations.

matrixToRel :: [[String]] -> Rel String (String, Int)

Convert a matrix to a relation. Every cell gives rise to a pair with first element the key from the first column in the corresponding row, and with second element a pair of the cell value and the column number. Cells with null values do not give rise to any pair.

rowToRel :: Rel String (String, Int) -> [String] -> Rel String (String, Int)

Auxiliaries

type FilterMask = [Bool]

filterWithMask :: FilterMask -> [x] -> [x]

Keep or discard element of a list, depending on the truth value at the corresponding position in a given filter mask. If the mask is shorter than the given list, the list is truncated.

valueSets :: Ord a => [Set a] -> [[a]] -> [Set a]

Compute the sets of values that occur in each collumn of a given matrix.

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