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improve "Reverse" operation

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* Make "Character" option actually reverse characters
* Add new option "Byte" that behaves as previous "Character" option
This commit is contained in:
MikeCAT 2022-11-02 22:37:09 +09:00
parent ed8bd34915
commit 3700780d14
1 changed files with 21 additions and 1 deletions
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22
src/core/operations/Reverse.mjs
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@ -5,6 +5,7 @@
*/ */
import Operation from "../Operation.mjs"; import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
/** /**
* Reverse operation * Reverse operation
@ -26,7 +27,8 @@ class Reverse extends Operation {
{ {
"name": "By", "name": "By",
"type": "option", "type": "option",
"value": ["Character", "Line"] "value": ["Byte", "Character", "Line"],
"defaultIndex": 1
} }
]; ];
} }
@ -57,6 +59,24 @@ class Reverse extends Operation {
result.push(0x0a); result.push(0x0a);
} }
return result.slice(0, input.length); 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 { } else {
return input.reverse(); return input.reverse();
} }