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module Levenshtein exposing (distance)
{-| Levenshtein distance is a metric for measuring the difference between two strings.
@docs distance
Copied from
-}
import Array exposing (Array)
{-| Computes the Levenshtein distance between two strings.
-}
distance : String -> String -> Int
distance str1 str2 =
if str1 == str2 then
0
else
distanceHelper
(Array.fromList (String.toList str1))
(Array.fromList (String.toList str2))
distanceHelper : Array Char -> Array Char -> Int
distanceHelper arr1 arr2 =
let
calculateEditDistanceForChars : Table -> ( Int, Int ) -> ( Table, Int )
calculateEditDistanceForChars table ( i, j ) =
case ( Array.get (i - 1) arr1, Array.get (j - 1) arr2 ) of
( Just chr1, Just chr2 ) ->
let
( table1, dist1 ) =
tableFetch ( i - 1, j ) calculateEditDistanceForChars table
( table2, dist2 ) =
tableFetch ( i, j - 1 ) calculateEditDistanceForChars table1
( table3, dist3 ) =
tableFetch ( i - 1, j - 1 ) calculateEditDistanceForChars table2
in
( table3
-- Find the smallest of (dist1 + 1), (dist2 + 1), and (dist3 + distanceIndicator)
, if dist3 < dist1 then
if dist3 < dist2 then
if chr1 /= chr2 then
dist3 + 1
else
dist3
else
dist1 + 1
else if dist1 > dist2 then
dist2 + 1
else
dist1 + 1
)
_ ->
( table, max i j )
indecesForLastChars =
( Array.length arr1, Array.length arr2 )
in
calculateEditDistanceForChars (tableEmpty indecesForLastChars) indecesForLastChars
|> Tuple.second
--- tableElm
{-
The algorithm goes across the various combinations of characters in the two strings to be compared.
The result of every combination can be looked at like a grid:
- K I T T E N
- (0,0) (1,0) (2,0) (3,0) (4,0) (5,0) (6,0)
S (0,1) (1,1) (2,1) (3,1) (4,1) (5,1) (6,1)
I (0,2) (1,2) (2,2) (3,2) (4,2) (5,2) (6,2)
T (0,3) (1,3) (2,3) (3,3) (4,3) (5,3) (6,3)
T (0,4) (1,4) (2,4) (3,4) (4,4) (5,4) (6,4)
I (0,5) (1,5) (2,5) (3,5) (4,5) (5,5) (6,5)
N (0,6) (1,6) (2,6) (3,6) (4,6) (5,6) (6,6)
G (0,7) (1,7) (2,7) (3,7) (4,7) (5,7) (6,7)
Note that each row and column have room for one more element than the length of the string they represent.
To store the result for each comparison efficiently, we use a flat array, where the data looks like this:
[ (0,0), (1,0), (2,0), (3,0), (4,0), (5,0), (6,0), (0,1), (1,1), (2,1), (3,1), etc.]
Where the index to read from can be calculated from the key and the "width" of the grid.
-}
type Table
= Table Int (Array Int)
tableEmpty : ( Int, Int ) -> Table
tableEmpty ( sizeA, sizeB ) =
let
dimension =
sizeB + 1
arraySize =
(sizeA + 1) * dimension - 1
in
Table dimension (Array.repeat arraySize -1)
tableFetch : ( Int, Int ) -> (Table -> ( Int, Int ) -> ( Table, Int )) -> Table -> ( Table, Int )
tableFetch (( iKey, jKey ) as key) builder ((Table dimension distanceStore) as table) =
let
index =
iKey * dimension + jKey
in
case Array.get index distanceStore of
Just editDistance ->
if editDistance == -1 then
let
( Table _ newStore, actualEditDistance ) =
builder table key
in
( Table dimension (Array.set index actualEditDistance newStore), actualEditDistance )
else
( table, editDistance )
Nothing ->
-- Would only occur if we are out of bounds on the array. This should never happen
( table, -1 )
{- LICENSE
The code was copied from https://github.com/dasch/levenshtein
and including the change in https://github.com/dasch/levenshtein/pull/10
from https://github.com/KasMA1990/levenshtein
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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the terms of any separate license agreement you may have executed
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except as required for reasonable and customary use in describing the
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8. Limitation of Liability. In no event and under no legal theory,
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unless required by applicable law (such as deliberate and grossly
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has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
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or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
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boilerplate notice, with the fields enclosed by brackets "[]"
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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-}

63
tests/NoUnknownCssClasses.elm
View File

@ -14,6 +14,7 @@ import Elm.Syntax.Expression as Expression exposing (Expression)
import Elm.Syntax.ModuleName exposing (ModuleName)
import Elm.Syntax.Node as Node exposing (Node(..))
import Elm.Syntax.Range as Range exposing (Range)
import Levenshtein
import NoInconsistentAliases exposing (Config)
import Parser exposing ((|.), (|=), Parser)
import Review.ModuleNameLookupTable as ModuleNameLookupTable exposing (ModuleNameLookupTable)
@ -265,15 +266,70 @@ reportClasses cssFunctions context fnRange name firstArg restOfArguments =
[]
reportError : Range -> String -> Rule.Error {}
reportError range name =
reportError : Set String -> Range -> String -> Rule.Error {}
reportError knownClasses range name =
Rule.error
{ message = "Unknown CSS class \"" ++ name ++ "\""
, details = [ "I could not find this class in CSS files. Have you made a typo? Here are similarly-named classes: TODO" ]
, details =
"I could not find this class in CSS files. Have you made a typo?"
:: (if Set.isEmpty knownClasses then
[]
else
[ String.join "\n"
("Here are similarly-named classes:"
:: List.map (\str -> " - " ++ str) (similarClasses name knownClasses)
)
]
)
}
range
similarClasses : String -> Set String -> List String
similarClasses targetClass knownClasses =
Set.foldl
(\class ({ first, second } as untouched) ->
let
distance : Int
distance =
computeDistance class targetClass
in
if isSmallerDistance distance first then
{ first = Just { class = class, distance = distance }
, second = first
}
else if isSmallerDistance distance second then
{ first = first
, second = Just { class = class, distance = distance }
}
else
untouched
)
{ first = Nothing, second = Nothing }
knownClasses
|> (\{ first, second } -> List.filterMap (Maybe.map .class) [ first, second ])
isSmallerDistance : Int -> Maybe { a | distance : Int } -> Bool
isSmallerDistance distance maybeElement =
case maybeElement of
Just element ->
distance < element.distance
Nothing ->
True
computeDistance : String -> String -> Int
computeDistance a b =
Basics.min
(Levenshtein.distance a b)
(Levenshtein.distance b a)
unknownClasses : Set String -> Range -> String -> List (Rule.Error {})
unknownClasses knownClasses range str =
let
@ -290,6 +346,7 @@ unknownClasses knownClasses range str =
else
reportError
knownClasses
{ start = { row = row, column = column + offset }
, end = { row = row, column = column + offset + String.length class }
}

11
tests/NoUnknownCssClassesTest.elm
View File

@ -34,11 +34,14 @@ import Html.Attributes as Attr
view model =
Html.span [ Attr.class "unknown" ] []
"""
|> Review.Test.run (rule defaults)
|> Review.Test.run (defaults |> withHardcodedKnownClasses [ "known", "bar", "unknown2" ] |> rule)
|> Review.Test.expectErrors
[ Review.Test.error
{ message = "Unknown CSS class \"unknown\""
, details = [ "I could not find this class in CSS files. Have you made a typo? Here are similarly-named classes: TODO" ]
, details =
[ "I could not find this class in CSS files. Have you made a typo?"
, "Here are similarly-named classes:\n - unknown2\n - known"
]
, under = "unknown"
}
]
@ -66,7 +69,7 @@ view model =
|> Review.Test.expectErrors
[ Review.Test.error
{ message = "Unknown CSS class \"unknown\""
, details = [ "I could not find this class in CSS files. Have you made a typo? Here are similarly-named classes: TODO" ]
, details = [ "I could not find this class in CSS files. Have you made a typo?" ]
, under = "unknown"
}
]
@ -83,7 +86,7 @@ view model =
|> Review.Test.expectErrors
[ Review.Test.error
{ message = "Unknown CSS class \"unknown\""
, details = [ "I could not find this class in CSS files. Have you made a typo? Here are similarly-named classes: TODO" ]
, details = [ "I could not find this class in CSS files. Have you made a typo?" ]
, under = "unknown"
}
]