jsxlsxio

jsxlsxio is a N-API wrapper exposing the functions of the C library xlsxio from brechtsanders (https://github.com/brechtsanders/xlsxio).

Note: it's currently only exposing the C part to Node.js and requires a JS abstraction layer to handle things such as memory management which shouldn't exist.

How to install

Just use npm i jsxlsxio to install the package in your node_modules projects or npm i jsxlsxio --save to also add it to your package.json.

If no prebuilt native module exist for your system, the module will try to build it. However, it requires a C/C++ compiler toolchain to be present in your system and the development versions of the minizip, expat and xlsxio libraries to be present on your system (at least the compiled libraries with their headers, such as lib*-dev packages on repositories).

You can also compile this module from the sources by cloning this repository and using the command npm run compile. This way, you can also create a deps/ directory inside the root of this module and it will look for the headers and libraries in the include/ and lib/sub-directories if you don't want to use your system versions of the libraries.

The compile script has 4 variations:

• npm run compile: will compile the module in release version corresponding to your platform
• npm run compile:debug: will compile the module in release version corresponding to your platform
• npm run compile:i686: will cross-compile the module in release version for x86 variant of your platform (supposing your using an x86_64 processor)
• npm run compile:i6868-debug: will cross-compile the module in release version for x86 variant of your platform (supposing your using an x86_64 processor)

Get started

To use this wrapper, you just need to include the module in your script using require('jsxlsxio') and all functions are available through it.

For example, importing it and printing the content of the module in a node CLI will show this kind of output:

> const jsxlsxio = require('jsxlsxio');
undefined
> jsxlsxio
{ xlsxioread_close: [Function: xlsxioread_close],
  xlsxioread_get_version_string: [Function: xlsxioread_get_version_string],
  xlsxioread_get_version: [Function: xlsxioread_get_version],
  xlsxioread_list_sheets: [Function: xlsxioread_list_sheets],
  xlsxioread_open: [Function: xlsxioread_open],
  xlsxioread_open_filehandle: [Function: xlsxioread_open_filehandle],
  xlsxioread_open_memory: [Function: xlsxioread_open_memory],
  xlsxioread_process: [Function: xlsxioread_process],
  xlsxioread_sheet_close: [Function: xlsxioread_sheet_close],
  xlsxioread_sheet_next_cell: [Function: xlsxioread_sheet_next_cell],
  xlsxioread_sheet_next_cell_datetime: [Function: xlsxioread_sheet_next_cell_dat
etime],
  xlsxioread_sheet_next_cell_float: [Function: xlsxioread_sheet_next_cell_float]
,
  xlsxioread_sheet_next_cell_int: [Function: xlsxioread_sheet_next_cell_int],
  xlsxioread_sheet_next_cell_string: [Function: xlsxioread_sheet_next_cell_strin
g],
  xlsxioread_sheet_next_row: [Function: xlsxioread_sheet_next_row],
  xlsxioread_sheet_open: [Function: xlsxioread_sheet_open],
  xlsxioread_sheetlist_close: [Function: xlsxioread_sheetlist_close],
  xlsxioread_sheetlist_next: [Function: xlsxioread_sheetlist_next],
  xlsxioread_sheetlist_open: [Function: xlsxioread_sheetlist_open],
  xlsxiowrite_add_cell_datetime: [Function: xlsxiowrite_add_cell_datetime],
  xlsxiowrite_add_cell_float: [Function: xlsxiowrite_add_cell_float],
  xlsxiowrite_add_cell_int: [Function: xlsxiowrite_add_cell_int],
  xlsxiowrite_add_cell_string: [Function: xlsxiowrite_add_cell_string],
  xlsxiowrite_add_column: [Function: xlsxiowrite_add_column],
  xlsxiowrite_close: [Function: xlsxiowrite_close],
  xlsxiowrite_get_version_string: [Function: xlsxiowrite_get_version_string],
  xlsxiowrite_get_version: [Function: xlsxiowrite_get_version],
  xlsxiowrite_next_row: [Function: xlsxiowrite_next_row],
  xlsxiowrite_open: [Function: xlsxiowrite_open],
  xlsxiowrite_set_detection_rows: [Function: xlsxiowrite_set_detection_rows],
  xlsxiowrite_set_row_height: [Function: xlsxiowrite_set_row_height],
}

Read functions

All functions related to the reading of an Excel file are exposed on the xlsxioread_* functions. Here's the list of them:

• xlsxioread_open(filepath)
  • Parameters:
    • filepath: the filepath of the workbook to open (as a string)
  • Return: a pointer on the opened workbook on success, else returns undefined
  • Description: opens a workbook by passing its path as parameter
• xlsxioread_open_filehandle(fd)
  • Parameters:
    • fd: the file descriptor of the workbook to open (a number)
  • Return: a pointer on the opened workbook on success, else returns undefined
  • Description: opens a workbook by giving the file descriptor associated to it
• xlsxioread_open_memory(data, datalen, freedata)
  • Parameters:
    • data: a pointer (a number) on the starting location of the workbook in memory
    • datalen: the length (in bytes, represented as a number) of the workbook in memory
    • freedata: a value (a number) representing if the memory where the workbook is stored will be freed or not (any non-0 values) when xlsxioread_close is called
  • Return: a pointer on the opened workbook on success, else returns undefined
  • Description: opens an in-memory stored workbook
• xlsxioread_close(workbook)
  • Parameters:
    • workbook: a pointer (a number) on the workbook to close
  • Return: nothing (undefined)
  • Description: closes the workbook on the pointer passed as parameter
• xlsxioread_get_version()
  • Parameters: nothing
  • Return: a list of integers representing the version of the C xlsxio library version (symver notation)
  • Description: get the version of the C xlsxio library used by the module
• xlsxioread_get_version_string()
  • Parameters: nothing
  • Return: a string representing the version of the C xlsxio library version (symver notation)
  • Description: get the version of the C xlsxio library used by the module
• xlsxioread_list_sheets(workbook, callback, data)
  • Parameters:
    • workbook: a pointer (a number) on an opened workbook
    • callback: a function to call back every time a sheet name is ready (taking two parameters: the name of the sheet as as string and a user defined variable as the second parameter). The function should be something like function mycallback(sheet_name, data)
    • data:a customisable user data to give as the second parameter of the callback
  • Return: nothing
  • Description: set a callback to call every time a workbook sheet name is found and start the parsing
• xlsxioread_sheetlist_open(workbook)
  • Parameters:
    • workbook: a pointer (a number) on an opened workbook
  • Return: a pointer (a number) on a list of workbook sheets names
  • Description: create a list of workbook sheets names which can be iterated using xlsxioread_sheetlist_next and freed using xlsxioread_sheelist_close
• xlsxioread_sheetlist_next(sheetlist)
  • Parameters:
    • sheetlist: a pointer (a number) on a list of workbook sheets
  • Return: the next sheet name as a string or undefined if there are no more sheets to retrieve names
  • Description: retrieve the next workbook sheet name
• xlsxioread_sheetlist_close(sheetlist)
  • Parameters:
    • sheetlist: close the sheetlist passed as a pointer (a number) and free its memory
  • Return: nothing (undefined)
  • Description: close the sheetlist passed as a pointer (a number) and free its memory
• xlsxioread_process(workbook, sheet_name, flags, cell_callback, row_callback, data)
  • Parameters:
    • workbook: a pointer on an opened workbook (a number)
    • sheet_name: the name of the sheet to open or undefined to open the first one
    • flags: flags (a number) to control how the xlsxio library will read the content of the worksheet
    • cell_callback: a function of the format myfunction(row, col, value, data) which will be called every time a cell is ready to be processed
      • row: a number representing the number of the row in the sheet
      • col: a number representing the column position in the sheet
      • value: a string representing the value in the cell
      • data: the object passed in the data parameter of the xlsxioread_process function
    • row_callback: a function of the format myfunction(row, maxcol, data) which will be called every time a row is ready to be processed
      • row: a number representing the number of the row in the sheet
      • maxcol: a number representing the index of the latest column in the row
      • data: the object passed in the data parameter of the xlsxioread_process function
    • data: an object to pass to callback functions when calling them
  • Return: nothing (undefined)
  • Description: open a workbook, process it automatically by calling callback functions passed as parameters and close the workbook once it finishes
• xlsxioread_sheet_open(workbook, sheet_name, flags)
  • Parameters:
    • workbook: a pointer on an opened workbook (a number)
    • sheet_name: the name of the sheet to open or undefined to open the first one
    • flags: flags (a number) to control how the xlsxio library will read the content of the worksheet
  • Return: a pointer on the opened worksheet (a number) and undefined in case of failure
  • Description: open a worksheet in the workbook and return a pointer on it so it can be processed manually by the user
• xlsxioread_sheet_close(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: nothing (undefined)
  • Description: close the worksheet passed as parameter and free its memory
• xlsxioread_sheet_next_row(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the index of the new current row (a number) if there's one else return 0 (as the first row is 1)
  • Description: move the current row to the next in the worksheet
• xlsxioread_sheet_next_cell(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the value of the next cell to read in the row as a string if there's one else undefined
  • Description: read and return the value of the next cell in the worksheet and update the cursor
• xlsxioread_sheet_next_cell_string(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the value of the next cell to read in the row as a string if there's one else undefined
  • Description: read and return the value of the next cell in the worksheet and update the cursor
• xlsxioread_sheet_next_cell_int(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the value of the next cell to read in the row as a number if there's one else undefined
  • Description: read and return the value of the next cell in the worksheet and update the cursor
• xlsxioread_sheet_next_cell_float(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the value of the next cell to read in the row as a number if there's one else undefined
  • Description: read and return the value of the next cell in the worksheet and update the cursor
• xlsxioread_sheet_next_cell_datetime(worksheet)
  • Parameters:
    • worksheet: a pointer on a worksheet opened by xlsxioread_sheet_open (a number)
  • Return: the value of the next cell to read in the row as a number if there's one else undefined
  • Description: read and return the value of the next cell in the worksheet and update the cursor. The datetime is represented as a timestamp

Write functions

All functions related to the reading of an Excel file are exposed on the xlsxiowrite_* functions. Here's the list of them:

• xlsxiowrite_open(filepath, sheetname)
  • Parameters:
    • filepath: the filepath of the workbook to open (as a string)
    • sheetname: the name of the sheet to write in the worksheet (as a string)
  • Return: a pointer on the opened worksheet on success, else returns undefined
  • Description: opens a worksheet by passing its path and name of the sheet as parameters
• xlsxiowrite_close(worksheet)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to close
  • Return: 0 on success
  • Description: closes the worksheet on the pointer passed as parameter
• xlsxiowrite_get_version()
  • Parameters: nothing
  • Return: a list of integers representing the version of the C xlsxio library version (symver notation)
  • Description: get the version of the C xlsxio library used by the module
• xlsxiowrite_get_version_string()
  • Parameters: nothing
  • Return: a string representing the version of the C xlsxio library version (symver notation)
  • Description: get the version of the C xlsxio library used by the module
• xlsxiowrite_set_detection_rows(worksheet, rows)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • rows: the number of rows used to compute the width of columns (as a number)
  • Return: nothing (undefined)
  • Description: set the number of rows used to compute the width of the columns in the worksheet
• xlsxiowrite_set_row_height(worksheet, height)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • height: the height of the rows (in text lines, as a number) in the worksheet
  • Return: nothing (undefined)
  • Description: set the height of the rows in the worksheet
• xlsxiowrite_add_column(worksheet, name, width)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • name: name of the column to add (a string)
    • width: width of the column to add
  • Return: nothing (undefined)
  • Description: add a column to the worksheet. Must be called before any xlsxiowrite_next_row or xlsxiowrite_add_cell_* function
• xlsxiowrite_next_row(worksheet)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
  • Return: nothing (undefined)
  • Description: end current row the row and create a new one next time a xlsxiowrite_add_cell_* function is called
• xlsxiowrite_add_cell_string(worksheet, value)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • value: content to write in the cell added in the worksheet as string
  • Return: nothing (undefined)
  • Description: set the content of the cell to add in worksheet
• xlsxiowrite_add_cell_int(worksheet, value)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • value: content to write in the cell added in the worksheet as a number (integer values only)
  • Return: nothing (undefined)
  • Description: set the content of the cell to add in worksheet
• xlsxiowrite_add_cell_float(worksheet, value)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • value: content to write in the cell added in the worksheet as a number
  • Return: nothing (undefined)
  • Description: set the content of the cell to add in worksheet
• xlsxiowrite_add_cell_datetime(worksheet, value)
  • Parameters:
    • worksheet: a pointer (a number) on the worksheet to use
    • value: content to write in the cell added in the worksheet as a number (represented by a timestamp)
  • Return: nothing (undefined)
  • Description: set the content of the cell to add in worksheet