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120 lines
4.3 KiB
120 lines
4.3 KiB
2 years ago
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# [SheetJS SSF](http://sheetjs.com)
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ssf (SpreadSheet Format) is a pure JS library to format data using ECMA-376
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spreadsheet format codes (used in popular spreadsheet software packages).
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This is the community version. We also offer a pro version with additional
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features like international support as well as dedicated support.
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## Installation
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With [npm](https://www.npmjs.org/package/ssf):
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```bash
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$ npm install ssf
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```
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In the browser:
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```html
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<script src="ssf.js"></script>
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```
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The browser exposes a variable `SSF`
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When installed globally, npm installs a script `ssf` that renders the format
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string with the given arguments. Running the script with `-h` displays help.
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The script will manipulate `module.exports` if available . This is not always
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desirable. To prevent the behavior, define `DO_NOT_EXPORT_SSF`.
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## Usage
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`SSF.format(fmt, val, opts)` formats `val` using the format `fmt`.
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If `fmt` is a string, it will be parsed and evaluated. If `fmt` is a `number`,
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the actual format will be the corresponding entry in the internal format table.
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For a raw numeric format like `000`, the value should be passed as a string.
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Date arguments are interpreted in the local time of the JS client.
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The options argument may contain the following keys:
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| Option Name | Default | Description |
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| :---------- | :-----: | :--------------------------------------------------- |
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| `date1904` | false | Use 1904 date system if true, 1900 system if false |
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### Manipulating the Internal Format Table
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Binary spreadsheet formats store cell formats in a table and reference by index.
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This library uses a global table:
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`SSF._table` is the underlying object, mapping numeric keys to format strings.
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`SSF.load(fmt:string, idx:?number):number` assigns the format to the specified
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index and returns the index. If the index is not specified, SSF will search the
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space for an available format slot pick an unused slot. For compatibility with
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the XLS and XLSB file formats, custom indices should be in the valid ranges
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`5-8`, `23-26`, `41-44`, `63-66`, `164-382` (see `[MS-XLSB] 2.4.655 BrtFmt`)
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`SSF.get_table()` gets the internal format table (number to format mapping).
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`SSF.load_table(table)` sets the internal format table.
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### Other Utilities
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`SSF.parse_date_code(val:number, opts:?any)` parses `val`, returning an object:
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```typescript
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type SSFDate = {
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D:number; /* number of whole days since relevant epoch, 0 <= D */
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y:number; /* integral year portion, epoch_year <= y */
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m:number; /* integral month portion, 1 <= m <= 12 */
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d:number; /* integral day portion, subject to gregorian YMD constraints */
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q:number; /* integral day of week (0=Sunday .. 6=Saturday) 0 <= q <= 6 */
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T:number; /* number of seconds since midnight, 0 <= T < 86400 */
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H:number; /* integral number of hours since midnight, 0 <= H < 24 */
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M:number; /* integral number of minutes since the last hour, 0 <= M < 60 */
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S:number; /* integral number of seconds since the last minute, 0 <= S < 60 */
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u:number; /* sub-second part of time, 0 <= u < 1 */
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}
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```
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`SSF.is_date(fmt:string):boolean` returns `true` if `fmt` encodes a date format.
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## Examples
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- [Basic Demo](http://oss.sheetjs.com/ssf/)
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- [Custom Formats Builder](https://customformats.com)
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## Related Packages
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[`ssf-cli`](https://www.npmjs.com/package/ssf-cli) is a simple NodeJS command
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line tool for formatting numbers.
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## License
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Please consult the attached LICENSE file for details. All rights not explicitly
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granted by the Apache 2.0 license are reserved by the Original Author.
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## References
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- `ECMA-376`: Office Open XML File Formats
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- `MS-XLS`: Excel Binary File Format (.xls) Structure Specification
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- `MS-XLSB`: Excel (.xlsb) Binary File Format
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## Badges
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[](https://saucelabs.com/u/ssfjs)
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[](https://travis-ci.org/SheetJS/ssf)
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[](https://coveralls.io/r/SheetJS/ssf?branch=master)
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[](https://npmjs.org/package/ssf)
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[](https://david-dm.org/sheetjs/ssf)
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[](https://github.com/SheetJS/ssf)
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