feat(fileSize): turn back to bytes

DOC.md

@@ -6186,6 +6186,7 @@ Turn bytes into human readable file size.
 
 ```typescript
 function fileSize(bytes: number): string;
+function fileSize(size: string): number;
 ```
 
 </details>
@@ -6195,6 +6196,13 @@ function fileSize(bytes: number): string;
 |bytes |File bytes        |
 |return|Readable file size|
 
+Turn human readable file size into bytes.
+
+|Name  |Desc              |
+|------|------------------|
+|size  |Readable file size|
+|return|File bytes        |
+
 ```javascript
 fileSize(5); // -> '5'
 fileSize(1500); // -> '1.46K'

DOC_CN.md

@@ -6179,6 +6179,7 @@ fibonacci(3); // -> 2
 
 ```typescript
 function fileSize(bytes: number): string;
+function fileSize(size: string): number;
 ```
 
 </details>
@@ -6188,6 +6189,13 @@ function fileSize(bytes: number): string;
 |bytes|文件字节大小|
 |返回值|易于阅读的文件大小|
 
+将易于阅读的文件大小转换为字节数。
+
+|参数名|说明|
+|-----|---|
+|size|易于阅读的文件大小|
+|返回值|文件字节大小|
+
 ```javascript
 fileSize(5); // -> '5'
 fileSize(1500); // -> '1.46K'

i18n/fileSize.md

@@ -7,3 +7,9 @@
 |bytes|文件字节大小|
 |返回值|易于阅读的文件大小|
 
+将易于阅读的文件大小转换为字节数。
+
+|参数名|说明|
+|-----|---|
+|size|易于阅读的文件大小|
+|返回值|文件字节大小|

index.json

@@ -2530,7 +2530,10 @@
         ]
     },
     "fileSize": {
-        "dependencies": [],
+        "dependencies": [
+            "isStr",
+            "toNum"
+        ],
         "description": "Turn bytes into human readable file size.",
         "env": [
             "node",
@@ -6416,8 +6419,7 @@
             "defaults",
             "trim",
             "rtrim",
-            "filter",
-            "last"
+            "filter"
         ],
         "description": "Output table string.",
         "env": [

src/fileSize.js

@@ -4,6 +4,13 @@
  * |------|------------------|
  * |bytes |File bytes        |
  * |return|Readable file size|
+ *
+ * Turn human readable file size into bytes.
+ *
+ * |Name  |Desc              |
+ * |------|------------------|
+ * |size  |Readable file size|
+ * |return|File bytes        |
  */
 
 /* example
@@ -20,15 +27,36 @@
 
 /* typescript
  * export declare function fileSize(bytes: number): string;
+ * export declare function fileSize(size: string): number;
  */
 
+_('isStr toNum');
+
 exports = function(bytes) {
-    if (bytes <= 0) return '0';
+    if (isStr(bytes)) {
+        const match = bytes.match(regStrSize);
 
-    const suffixIdx = Math.floor(Math.log(bytes) / Math.log(1024));
-    const val = bytes / Math.pow(2, suffixIdx * 10);
+        if (!match) return 0;
 
-    return +val.toFixed(2) + suffixList[suffixIdx];
+        return Math.round(toNum(match[1]) * factor[match[2] || 'B']);
+    } else {
+        if (bytes <= 0) return '0';
+
+        const suffixIdx = Math.floor(Math.log(bytes) / Math.log(1024));
+        const val = bytes / Math.pow(2, suffixIdx * 10);
+
+        return +val.toFixed(2) + suffixList[suffixIdx];
+    }
 };
 
+const factor = {
+    B: 1,
+    K: 1024
+};
+factor.M = factor.K * 1024;
+factor.G = factor.M * 1024;
+factor.T = factor.G * 1024;
+
 const suffixList = ['', 'K', 'M', 'G', 'T'];
+
+const regStrSize = /^(\d+(?:\.\d+)?) *(K|M|G|T)?$/;

test/fileSize.js

@@ -7,5 +7,14 @@ tests([
     [1500000, '1.43M'],
     [1500000000, '1.4G'],
     [4015492000, '3.74G'],
-    [1500000000000, '1.36T']
+    [1500000000000, '1.36T'],
+    ['5', 5],
+    ['0', 0],
+    ['761', 761],
+    ['1.46K', 1495],
+    ['2.4K', 2458],
+    ['1.43M', 1499464],
+    ['1.4G', 1503238554],
+    ['3.74G', 4015794422],
+    ['1.36T', 1495335813775]
 ]);