xsheetjs/docbits/80_parseopts.md

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## Parsing Options
The exported `read` and `readFile` functions accept an options argument:
| Option Name | Default | Description |
| :---------- | ------: | :--------------------------------------------------- |
| type | | Input data encoding (see Input Type below) |
| cellFormula | true | Save formulae to the .f field ** |
| cellHTML | true | Parse rich text and save HTML to the .h field |
| cellNF | false | Save number format string to the .z field |
| cellStyles | false | Save style/theme info to the .s field |
| cellDates | false | Store dates as type `d` (default is `n`) |
| sheetStubs | false | Create cell objects of type `z` for stub cells |
| sheetRows | 0 | If >0, read the first `sheetRows` rows ** |
| bookDeps | false | If true, parse calculation chains |
| bookFiles | false | If true, add raw files to book object ** |
| bookProps | false | If true, only parse enough to get book metadata ** |
| bookSheets | false | If true, only parse enough to get the sheet names |
| bookVBA | false | If true, expose vbaProject.bin to `vbaraw` field ** |
| password | "" | If defined and file is encrypted, use password ** |
| WTF | false | If true, throw errors on unexpected file features ** |
- `cellFormula` option only applies to formats that require extra processing to
parse formulae (XLS/XLSB).
- Even if `cellNF` is false, formatted text will be generated and saved to `.w`
- In some cases, sheets may be parsed even if `bookSheets` is false.
- `bookSheets` and `bookProps` combine to give both sets of information
- `Deps` will be an empty object if `bookDeps` is falsy
- `bookFiles` behavior depends on file type:
* `keys` array (paths in the ZIP) for ZIP-based formats
* `files` hash (mapping paths to objects representing the files) for ZIP
* `cfb` object for formats using CFB containers
- `sheetRows-1` rows will be generated when looking at the JSON object output
(since the header row is counted as a row when parsing the data)
- `bookVBA` merely exposes the raw vba object. It does not parse the data.
- Currently only XOR encryption is supported. Unsupported error will be thrown
for files employing other encryption methods.
- WTF is mainly for development. By default, the parser will suppress read
errors on single worksheets, allowing you to read from the worksheets that do
parse properly. Setting `WTF:1` forces those errors to be thrown.
The defaults are enumerated in bits/84\_defaults.js
### Input Type
Strings can be interpreted in multiple ways. The `type` parameter for `read`
tells the library how to parse the data argument:
| `type` | expected input |
|------------|-----------------------------------------------------------------|
| `"base64"` | string: base64 encoding of the file |
| `"binary"` | string: binary string (`n`-th byte is `data.charCodeAt(n)`) |
| `"buffer"` | nodejs Buffer |
| `"array"` | array: array of 8-bit unsigned int (`n`-th byte is `data[n]`) |
| `"file"` | string: filename that will be read and processed (nodejs only) |
### Guessing File Type
Excel and other spreadsheet tools read the first few bytes and apply other
heuristics to determine a file type. This enables file type punning: renaming
files with the `.xls` extension will tell your computer to use Excel to open the
file but Excel will know how to handle it. This library applies similar logic:
| Byte 0 | Raw File Type | Spreadsheet Types |
|:-------|:--------------|:----------------------------------------------------|
| `0xD0` | CFB Container | BIFF 5/8 or password-protected XLSX/XLSB |
| `0x09` | BIFF Stream | BIFF 2/3/4/5 |
| `0x3C` | XML/HTML | SpreadsheetML or Flat ODS or UOS1 or HTML |
| `0x50` | ZIP Archive | XLSB or XLSX/M or ODS or UOS2 |
| `0xFE` | UTF8 Text | SpreadsheetML or Flat ODS or UOS1 |