forked from sheetjs/docs.sheetjs.com
Jurassic Engine demo
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</Style>
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</Styles>
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<Worksheet ss:Name="Engines">
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<Table ss:ExpandedColumnCount="8" ss:ExpandedRowCount="17" x:FullColumns="1" x:FullRows="1" ss:DefaultColumnWidth="65" ss:DefaultRowHeight="16">
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<Table ss:ExpandedColumnCount="8" ss:ExpandedRowCount="18" x:FullColumns="1" x:FullRows="1" ss:DefaultColumnWidth="65" ss:DefaultRowHeight="16">
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<Column ss:Index="3" ss:Width="24"/>
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<Column ss:Width="31"/>
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<Column ss:Width="24"/>
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@ -207,6 +207,16 @@
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<Cell ss:StyleID="s16"><Data ss:Type="String">✔</Data></Cell>
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<Cell ss:StyleID="s16"><Data ss:Type="String">✔</Data></Cell>
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</Row>
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<Row>
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<Cell ss:StyleID="s20" ss:HRef="/docs/demos/engines/jurassic#integration-example"><Data ss:Type="String">Jurassic.NET</Data></Cell>
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<Cell><Data ss:Type="String">C#</Data></Cell>
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<Cell ss:StyleID="s16"><Data ss:Type="String">✔</Data></Cell>
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<Cell ss:StyleID="s16"><Data ss:Type="String">✔</Data></Cell>
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<Cell ss:StyleID="s16"/>
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<Cell ss:StyleID="s16"/>
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<Cell ss:StyleID="s16"/>
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<Cell ss:StyleID="s16"/>
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</Row>
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</Table>
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<WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
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<PageSetup>
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373
docz/docs/03-demos/42-engines/26-jurassic.md
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373
docz/docs/03-demos/42-engines/26-jurassic.md
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---
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title: Sheets in .NET with Jurassic
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sidebar_label: C# + Jurassic
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pagination_prev: demos/bigdata/index
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pagination_next: solutions/input
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---
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import current from '/version.js';
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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import CodeBlock from '@theme/CodeBlock';
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Jurassic[^1] is a JavaScript compiler for .NET, In contrast to other engines,
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Jurassic generates .NET bytecode.
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[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
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data from spreadsheets.
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This demo uses Jurassic and SheetJS to read and write spreadsheets. We'll
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explore how to load SheetJS in the Jurassic engine, exchange binary data with a
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C# program, and process spreadsheets and structured data.
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The ["Integration Example"](#integration-example) section includes a complete
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command-line tool for reading arbitrary workbooks and writing data to ODS
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(OpenDocument Spreadsheet) workbooks.
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:::danger Telemetry
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**The `dotnet` command embeds telemetry.**
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The `DOTNET_CLI_TELEMETRY_OPTOUT` environment variable should be set to `1`.
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["Platform Configuration"](#platform-configuration) includes instructions for
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setting the environment variable on supported platforms.
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:::
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## Integration Details
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The [SheetJS "mini" script](/docs/getting-started/installation/standalone) can
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be parsed and evaluated in a Jurassic engine instance.
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:::warning pass
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Jurassic throws errors when processing the "full" script (`xlsx.full.min.js`):
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```
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Unhandled exception. Jurassic.JavaScriptException: Error: Maximum number of named properties reached.
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```
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**The `xlsx.mini.min.js` script must be used!**
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The mini build has a number of limitations, as noted in the installation guide.
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:::
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It is recommended to pass Base64 strings between C# code and the script engine.
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### Initialize Jurassic
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A `Jurassic.ScriptEngine` object can be created in one line:
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```csharp
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var engine = new Jurassic.ScriptEngine();
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```
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Jurassic does not expose the NodeJS `global`. It can be synthesized:
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:::note pass
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The goal is to run the following JavaScript code:
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```js
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var global = (function(){ return this; }).call(null);
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```
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:::
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```csharp
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engine.Evaluate("var global = (function(){ return this; }).call(null);");
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```
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### Load SheetJS Scripts
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Jurassic engine objects support the `ExecuteFile` method for evaluating scripts:
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```csharp
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/* read and evaluate the shim script */
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engine.ExecuteFile("shim.min.js");
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/* read and evaluate the main library */
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engine.ExecuteFile("xlsx.mini.min.js");
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```
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To confirm the library is loaded, `XLSX.version` can be inspected:
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```csharp
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Console.WriteLine("SheetJS version {0}", engine.Evaluate("XLSX.version"));
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```
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### Reading Files
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In C#, `System.IO.File.ReadAllBytes` reads file data into a `byte[]` byte array:
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```csharp
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string filename = "pres.xlsx";
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byte[] buf = File.ReadAllBytes(filename);
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```
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The bytes cannot be directly passed to Jurassic. Base64 strings are supported.
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An encoded Base64 string can be created with `System.Convert.ToBase64String`:
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```csharp
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string b64 = System.Convert.ToBase64String(buf);
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```
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`Jurassic.ScriptEngine#SetGlobalValue` will assign the C# String to a global:
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```csharp
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engine.SetGlobalValue("buf", b64);
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```
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The `buf` variable can be parsed from JS with the SheetJS `read` method[^2]:
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:::note pass
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The following script will be evaluated:
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```js
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var wb = XLSX.read(buf, {type:'base64'});
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```
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:::
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```csharp
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engine.Evaluate("var wb = XLSX.read(buf, {type:'base64'});");
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```
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`wb` is a SheetJS workbook object. The ["SheetJS Data Model"](/docs/csf) section
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describes the object structure and the ["API Reference"](/docs/api) section
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describes various helper functions.
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### Writing Files
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The SheetJS `write` method[^3] can write workbooks. The option `type: "base64"`
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instructs the library to generate Base64 strings. The `bookType` option[^4]
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controls the output file format.
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:::note pass
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The following expression will be evaluated:
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```js
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XLSX.write(wb, {bookType: 'ods', type: 'base64'})
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```
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The result will be passed back to C# code.
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:::
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```csharp
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string ods = engine.Evaluate("XLSX.write(wb, {bookType: 'ods', type: 'base64'})") as string;
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```
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`ods` is a Base64 string. `System.Convert.FromBase64String` can decode the
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string into a `byte[]` which can be written to file:
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```csharp
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File.WriteAllBytes("SheetJSJurassic.ods", System.Convert.FromBase64String(ods));
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```
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## Integration Example
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:::note Tested Deployments
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This demo was tested in the following deployments:
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| Architecture | Jurassic | Date |
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|:-------------|:---------|:-----------|
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| `darwin-x64` | `3.2.7` | 2024-06-15 |
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| `darwin-arm` | `3.2.7` | 2024-06-15 |
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:::
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### Platform Configuration
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0) Set the `DOTNET_CLI_TELEMETRY_OPTOUT` environment variable to `1`.
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<details open>
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<summary><b>How to disable telemetry</b> (click to hide)</summary>
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<Tabs groupId="os">
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<TabItem value="unix" label="Linux/MacOS">
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Add the following line to `.profile`, `.bashrc` and `.zshrc`:
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```bash title="(add to .profile , .bashrc , and .zshrc)"
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export DOTNET_CLI_TELEMETRY_OPTOUT=1
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```
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Close and restart the Terminal to load the changes.
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</TabItem>
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<TabItem value="win" label="Windows">
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Type `env` in the search bar and select "Edit the system environment variables".
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In the new window, click the "Environment Variables..." button.
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In the new window, look for the "System variables" section and click "New..."
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Set the "Variable name" to `DOTNET_CLI_TELEMETRY_OPTOUT` and the value to `1`.
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Click "OK" in each window (3 windows) and restart your computer.
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</TabItem>
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</Tabs>
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</details>
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1) Install .NET
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<details>
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<summary><b>Installation Notes</b> (click to show)</summary>
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For macOS x64 and ARM64, install the `dotnet-sdk` Cask with Homebrew:
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```bash
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brew install --cask dotnet-sdk
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```
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For Steam Deck Holo and other Arch Linux x64 distributions, the `dotnet-sdk` and
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`dotnet-runtime` packages should be installed using `pacman`:
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```bash
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sudo pacman -Syu dotnet-sdk dotnet-runtime
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```
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https://dotnet.microsoft.com/en-us/download/dotnet/6.0 is the official source
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for Windows and ARM64 Linux versions.
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</details>
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2) Open a new Terminal window in macOS or PowerShell window in Windows.
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### Base Project
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3) Create a new folder `SheetJSJurassic` and a new `dotnet` project:
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```bash
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mkdir SheetJSJurassic
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cd SheetJSJurassic
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dotnet new console
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dotnet run
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```
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4) Add Jurassic using the NuGet tool:
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```bash
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dotnet add package Jurassic --version 3.2.7
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```
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To verify Jurassic is installed, replace `Program.cs` with the following:
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```csharp title="Program.cs"
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var engine = new Jurassic.ScriptEngine();
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Console.WriteLine("Hello {0}", engine.Evaluate("'Sheet' + 'JS'"));
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```
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After saving, run the program:
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```bash
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dotnet run
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```
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The terminal should display `Hello SheetJS`
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### Add SheetJS
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5) Download the SheetJS mini script, shim script and test file. Move all three
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files to the project directory:
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<ul>
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<li><a href={`https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.mini.min.js`}>xlsx.mini.min.js</a></li>
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<li><a href={`https://cdn.sheetjs.com/xlsx-${current}/package/dist/shim.min.js`}>shim.min.js</a></li>
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<li><a href="https://docs.sheetjs.com/pres.xlsx">pres.xlsx</a></li>
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</ul>
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<CodeBlock language="bash">{`\
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curl -LO https://cdn.sheetjs.com/xlsx-${current}/package/dist/shim.min.js
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curl -LO https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.mini.min.js
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curl -LO https://docs.sheetjs.com/pres.xlsx`}
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</CodeBlock>
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6) Replace `Program.cs` with the following:
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```csharp title="Program.cs"
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var engine = new Jurassic.ScriptEngine();
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engine.Evaluate("var global = (function(){ return this; }).call(null);");
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engine.Evaluate(File.ReadAllText("shim.min.js"));
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engine.Evaluate(File.ReadAllText("xlsx.mini.min.js"));
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Console.WriteLine("SheetJS version {0}", engine.Evaluate("XLSX.version"));
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```
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After saving, run the program:
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```bash
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dotnet run
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```
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<p>The terminal should display <code>SheetJS version {current}</code></p>
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### Read and Write Files
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7) Replace `Program.cs` with the following:
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```csharp title="Program.cs"
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var engine = new Jurassic.ScriptEngine();
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/* Initialize Jurassic */
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engine.Evaluate("var global = (function(){ return this; }).call(null);");
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/* Load SheetJS Scripts */
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engine.ExecuteFile("shim.min.js");
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engine.ExecuteFile("xlsx.mini.min.js");
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Console.WriteLine("SheetJS version {0}", engine.Evaluate("XLSX.version"));
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/* Read and Parse File */
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byte[] filedata = File.ReadAllBytes(args[0]);
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string b64 = System.Convert.ToBase64String(filedata);
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engine.SetGlobalValue("buf", b64);
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engine.Evaluate("var wb = XLSX.read(buf, {type:'base64'});");
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/* Print CSV of first worksheet*/
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engine.Evaluate("var ws = wb.Sheets[wb.SheetNames[0]];");
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object csv = engine.Evaluate("XLSX.utils.sheet_to_csv(ws)");
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Console.Write(csv);
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/* Generate XLSB file and save to SheetJSJurassic.ods */
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string ods = engine.Evaluate("XLSX.write(wb, {bookType: 'ods', type: 'base64'})") as string;
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File.WriteAllBytes("SheetJSJurassic.ods", System.Convert.FromBase64String(ods));
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```
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After saving, run the program and pass the test file name as an argument:
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```bash
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dotnet run pres.xlsx
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```
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If successful, the program will print the contents of the first sheet as CSV
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rows. It will also create `SheetJSJurassic.ods`, an OpenDocument spreadsheet
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that can be opened in Excel or another spreadsheet editor.
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:::info pass
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Running `dotnet run` without the filename argument will show an error:
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```
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Unhandled exception. System.IndexOutOfRangeException: Index was outside the bounds of the array.
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at Program.<Main>$(String[] args) in C:\Users\Me\SheetJSJurassic\Program.cs:line 15
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```
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The command must be run with an argument specifying the name of the workbook:
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```bash
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dotnet run pres.xlsx
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```
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:::
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[^1]: The project does not have a website. The library is hosted on [NuGet](https://www.nuget.org/packages/Jurassic/).
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[^2]: See [`read` in "Reading Files"](/docs/api/parse-options)
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[^3]: See [`write` in "Writing Files"](/docs/api/write-options)
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[^4]: See ["Supported Output Formats" in "Writing Files"](/docs/api/write-options#supported-output-formats) for details on `bookType`
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47
tests/engines-jurassic.sh
Executable file
47
tests/engines-jurassic.sh
Executable file
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#!/bin/bash
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# https://docs.sheetjs.com/docs/demos/engines/jurassic
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cd /tmp
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rm -rf SheetJSJurassic
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mkdir SheetJSJurassic
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cd SheetJSJurassic
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dotnet new console
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dotnet run
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dotnet add package Jurassic --version 3.2.7
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curl -LO https://cdn.sheetjs.com/xlsx-0.20.2/package/dist/shim.min.js
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curl -LO https://cdn.sheetjs.com/xlsx-0.20.2/package/dist/xlsx.mini.min.js
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curl -LO https://docs.sheetjs.com/pres.xlsx
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cat >Program.cs <<EOF
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/* sheetjs (C) 2013-present SheetJS -- https://sheetjs.com */
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/* vim: set ts=2: */
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var engine = new Jurassic.ScriptEngine();
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/* Initialize Jurassic */
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engine.Evaluate("var global = (function(){ return this; }).call(null);");
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/* Load SheetJS Scripts */
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engine.ExecuteFile("shim.min.js");
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engine.ExecuteFile("xlsx.mini.min.js");
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Console.WriteLine("SheetJS version {0}", engine.Evaluate("XLSX.version"));
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/* Read and Parse File */
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byte[] filedata = File.ReadAllBytes(args[0]);
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string b64 = System.Convert.ToBase64String(filedata);
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engine.SetGlobalValue("buf", b64);
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engine.Evaluate("var wb = XLSX.read(buf, {type:'base64'});");
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/* Print CSV of first worksheet*/
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engine.Evaluate("var ws = wb.Sheets[wb.SheetNames[0]];");
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object csv = engine.Evaluate("XLSX.utils.sheet_to_csv(ws)");
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Console.Write(csv);
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/* Generate XLSB file and save to SheetJSJurassic.ods */
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string ods = engine.Evaluate("XLSX.write(wb, {bookType: 'ods', type: 'base64'})") as string;
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File.WriteAllBytes("SheetJSJurassic.ods", System.Convert.FromBase64String(ods));
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EOF
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dotnet run pres.xlsx
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