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59 lines
2.0 KiB
Plaintext
59 lines
2.0 KiB
Plaintext
app "parse-movies-csv"
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packages { pf: "platform/main.roc" }
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imports [Parser.Core.{ Parser, map, apply }, Parser.Str.{ RawStr }, Parser.CSV.{ CSV, record, field, string, nat }]
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provides [main] to pf
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input : Str
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input = "Airplane!,1980,\"Robert Hays,Julie Hagerty\"\r\nCaddyshack,1980,\"Chevy Chase,Rodney Dangerfield,Ted Knight,Michael O'Keefe,Bill Murray\""
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main : Str
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main =
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when Parser.CSV.parseStr movieInfoParser input is
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Ok movies ->
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moviesString =
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movies
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|> List.map movieInfoExplanation
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|> Str.joinWith ("\n")
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nMovies = List.len movies |> Num.toStr
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"\(nMovies) movies were found:\n\n\(moviesString)\n\nParse success!\n"
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Err problem ->
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when problem is
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ParsingFailure failure ->
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"Parsing failure: \(failure)\n"
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ParsingIncomplete leftover ->
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leftoverStr = leftover |> List.map Parser.Str.strFromRaw |> List.map (\val -> "\"\(val)\"") |> Str.joinWith ", "
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"Parsing incomplete. Following leftover fields while parsing a record: \(leftoverStr)\n"
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SyntaxError error ->
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"Parsing failure. Syntax error in the CSV: \(error)"
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MovieInfo := { title : Str, releaseYear : Nat, actors : List Str }
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movieInfoParser =
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record (\title -> \releaseYear -> \actors -> @MovieInfo { title, releaseYear, actors })
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|> apply (field string)
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|> apply (field nat)
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|> apply (field actorsParser)
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actorsParser =
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string
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|> map (\val -> Str.split val ",")
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movieInfoExplanation = \@MovieInfo { title, releaseYear, actors } ->
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enumeratedActors = enumerate actors
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releaseYearStr = Num.toStr releaseYear
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"The movie '\(title)' was released in \(releaseYearStr) and stars \(enumeratedActors)"
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enumerate : List Str -> Str
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enumerate = \elements ->
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{ before: inits, others: last } = List.split elements (List.len elements - 1)
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last
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|> List.prepend (inits |> Str.joinWith ", ")
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|> Str.joinWith " and "
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