diff --git a/src/core/operations/Reverse.mjs b/src/core/operations/Reverse.mjs index 895d6723..49c752a8 100644 --- a/src/core/operations/Reverse.mjs +++ b/src/core/operations/Reverse.mjs @@ -5,6 +5,7 @@ */ import Operation from "../Operation.mjs"; +import Utils from "../Utils.mjs"; /** * Reverse operation @@ -26,7 +27,8 @@ class Reverse extends Operation { { "name": "By", "type": "option", - "value": ["Character", "Line"] + "value": ["Byte", "Character", "Line"], + "defaultIndex": 1 } ]; } @@ -57,6 +59,24 @@ class Reverse extends Operation { result.push(0x0a); } return result.slice(0, input.length); + } else if (args[0] === "Character") { + const inputString = Utils.byteArrayToUtf8(input); + let result = ""; + for (let i = inputString.length - 1; i >= 0; i--) { + const c = inputString.charCodeAt(i); + if (i > 0 && 0xdc00 <= c && c <= 0xdfff) { + const c2 = inputString.charCodeAt(i - 1); + if (0xd800 <= c2 && c2 <= 0xdbff) { + // surrogates + result += inputString.charAt(i - 1); + result += inputString.charAt(i); + i--; + continue; + } + } + result += inputString.charAt(i); + } + return Utils.strToUtf8ByteArray(result); } else { return input.reverse(); }