519484d · elk · git.iko.soy

git.iko.soy/elk

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Add the toList and fromList functions

519484dEvan Czaplicki13 years ago

libraries/Native/String.js+11−4

compare with master

unifiedsplit

@@ -157,8 +157,7 @@ Elm.Native.String.make = function(elm) {

157 return JS.toList(is);

158 }

159

160− function toInt(str) {

160+ function toInt(s) {

161− var s = JS.fromString(str);

162 var len = s.length;

161 var len = s.length;

163 if (len === 0) { return Maybe.Nothing; }

162 if (len === 0) { return Maybe.Nothing; }

164 var start = 0;

163 var start = 0;

@@ -172,8 +171,7 @@ Elm.Native.String.make = function(elm) {

172 return Maybe.Just(parseInt(s, 10));

171 return Maybe.Just(parseInt(s, 10));

173 }

172 }

174

173

175− function toFloat(str) {

174+ function toFloat(s) {

176− var s = JS.fromString(str);

177 var len = s.length;

175 var len = s.length;

178 if (len === 0) { return Maybe.Nothing; }

176 if (len === 0) { return Maybe.Nothing; }

179 var start = 0;

177 var start = 0;

@@ -193,6 +191,13 @@ Elm.Native.String.make = function(elm) {

193 return Maybe.Just(parseFloat(s));

191 return Maybe.Just(parseFloat(s));

194 }

192 }

195

193

194+ function toList(str) {

195+ return JS.toList(str.split('').map(Utils.chr));

196+ }

197+ function fromList(chars) {

198+ return JS.fromList(chars).join('');

199+ }

200+

196 return Elm.Native.String.values = {

201 return Elm.Native.String.values = {

197 isEmpty: isEmpty,

202 isEmpty: isEmpty,

198 cons: F2(cons),

203 cons: F2(cons),

@@ -240,5 +245,7 @@ Elm.Native.String.make = function(elm) {

240

245

241 toInt: toInt,

246 toInt: toInt,

242 toFloat: toFloat,

247 toFloat: toFloat,

248+ toList: toList,

249+ fromList: fromList,

243 };

250 };

244};

251};

libraries/String.elm+24−4

@@ -14,8 +14,8 @@ are enclosed in `"double quotes"`. Strings are *not* lists of characters.

14# Check for Substrings

15@docs contains, startsWith, endsWith, indexes, indices

17−# Conversion To Numbers

17+# Conversions

18−@docs toInt, toFloat

18+@docs toInt, toFloat, toList, fromList

20# Formatting

21Cosmetic operations such as padding with extra characters or trimming whitespace.

@@ -85,12 +85,16 @@ filter = Native.String.filter

85reverse : String -> String

86reverse = Native.String.reverse

88−{-|

88+{-| Reduce a string from the left:

89+

90+ foldl cons "" "time" == "emit"

89-}

91-}

90foldl : (Char -> b -> b) -> b -> String -> b

92foldl : (Char -> b -> b) -> b -> String -> b

91foldl = Native.String.foldl

93foldl = Native.String.foldl

93−{-|

95+{-| Reduce a string from the right:

96+

97+ foldr cons "" "time" == "time"

94-}

98-}

95foldr : (Char -> b -> b) -> b -> String -> b

99foldr : (Char -> b -> b) -> b -> String -> b

96foldr = Native.String.foldr

100foldr = Native.String.foldr

@@ -289,3 +293,19 @@ toInt = Native.String.toInt

289-}

293-}

290toFloat : String -> Maybe Float

294toFloat : String -> Maybe Float

291toFloat = Native.String.toFloat

295toFloat = Native.String.toFloat

296+

297+{-| Convert a string to a list of characters.

298+

299+ toList "abc" == ['a','b','c']

300+-}

301+toList : String -> [Char]

302+toList = Native.String.toList

303+

304+{-| Convert a list of characters into a String. Can be useful if you

305+want to create a string primarly by consing, perhaps for decoding

306+something.

307+

308+ fromList ['a','b','c'] == "abc"

309+-}

310+fromList : String -> [Char]

311+fromList = Native.String.fromList