syndicate-js/README.md

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# Syndicate/js
A new, efficient implementation of Syndicate for JavaScript in both
node.js and the browser. The implementation techniques herein are the
subject of a forthcoming paper.
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## Quickstart
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### Option 1. Create a new program/library using Syndicate/js.
Use `npx @syndicate-lang/create DIRECTORY` or `npm init
@syndicate-lang DIRECTORY`:
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npm init @syndicate-lang myprogram
cd myprogram
npm i .
npm run build
node lib/index.js
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### Option 2. Add Syndicate/js to an existing program/library.
Install a few packages from the
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[@syndicate-lang](https://www.npmjs.com/org/syndicate-lang) scope on
npmjs.com:
npm i --save-dev @syndicate-lang/syntax @babel/preset-env
npm i --save @syndicate-lang/core
Then, add the `@syndicate-lang/syntax/plugin` to your `.babelrc`. Use
`npx syndicate-babel` in place of `npx babel` to compile your code.
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## Creating a new Syndicate/js project
Create a skeletal `package.json`:
{
"main": "lib/index.js",
"scripts": {
"build": "npx syndicate-babel src --out-dir lib",
"clean": "rm -rf lib"
}
}
The entry point will be `lib/index.js`; the corresponding *source*
file will be `src/index.js`.
Two `npm run` scripts are defined: one which compiles Syndicate/js
source files in `src` to plain JavaScript in `lib`. The compiler uses
Babel; we will configure Babel next.
Create a `.babelrc` file:
{
"presets": [ "@babel/preset-env" ],
"plugins": [ "@syndicate-lang/syntax/plugin" ]
}
Now, install the necessary dependencies. Babel and the Syndicate/js
extensions are needed at build-time:
npm i --save-dev @syndicate-lang/syntax @babel/preset-env
The Syndicate/js runtime and as many drivers as you would like to use
are needed at run-time:
npm i --save @syndicate-lang/core
npm i --save @syndicate-lang/driver-timer
Finally, create the main program file. Create a directory `src`, and
then a file `src/index.js`:
```javascript
const { TimeLaterThan } = activate require("@syndicate-lang/driver-timer");
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spawn named 'ticker' {
field this.counter = 0;
field this.deadline = +(new Date());
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on start { console.log('ticker starting'); }
on stop { console.log('ticker stopping'); }
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on asserted TimeLaterThan(this.deadline) {
this.counter++;
console.log('tick', new Date(), this.counter);
this.deadline += 1000;
}
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stop on (this.counter == 5);
}
```
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Now, compile the project:
npm run build
Finally, run the program:
node lib/index.js
The output should be something like:
ticker starting
tick 2018-11-05T14:23:27.713Z 1
tick 2018-11-05T14:23:28.705Z 2
tick 2018-11-05T14:23:29.706Z 3
tick 2018-11-05T14:23:30.706Z 4
tick 2018-11-05T14:23:31.707Z 5
ticker stopping
## Licence
@syndicate-lang, an implementation of Syndicate for JS.
Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.