Lua - Template

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This document defines some basic macros for applying the JavaScript Lua interpreter and VM https://daurnimator.github.io in LiaScript to make Markdown code-blocks executable.

Try it on LiaScript:

https://liascript.github.io/course/?https://raw.githubusercontent.com/liaTemplates/Lua/master/README.md

See the project on Github:

https://github.com/liaTemplates/Lua

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There are three ways to use this template. The easiest way is to use the import statement and the URL of the raw text-file of the master branch or any other branch or version. But you can also copy the required functionality directly into the header of your Markdown document, see therefor the last slide. And of course, you could also clone this project and change it, as you wish.

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1. Load the macros via

   import: https://raw.githubusercontent.com/liaTemplates/Lua/master/README.md

2. Copy the definitions into your Project

3. Clone this repository on GitHub

@LUA.eval

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Add the macro @LUA.eval to the end of a single Lua code-block to make it executable and editable in LiaScript. The current code gets evaluate by the JavaScript Lua interpreter and the result is shown in a console below.

print('hello' .. ' ' .. 'world!') -- This is Lua!

print(js.global:eval('[0,1,2,3,4,5][3]')) -- Run JS from Lua

-- Interact with the page using Lua

local screen = js.global.screen
print("you haz " .. (screen.width*screen.height) .. " pixels")

local window = js.global -- global object in JS is the window
window:alert("hello from lua!")
window:setTimeout(function() print('hello from lua callback') end, 2500)

local document = js.global.document
print("this window has title '" .. document.title .. "'")

-- call constructors (global, or as properties of other objects)
print("i made an ArrayBuffer of size " .. js.new(js.global.ArrayBuffer, 20).byteLength)
-- print("i made an ArrayBuffer of size " .. js.global.ArrayBuffer:new(20).byteLength)

print("time iz " .. js.global.Date.now()) -- call with no arguments

print('done!')

@Lua.eval

Implementation

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The code shows how the macro is implemented by calling the macro @Lua.eval. The @input macro gets substituted by the current input code. The script commands at the top define the references to the Lua JavaScript implementations that need to be called to load the interpreter and VM.

script:   https://daurnimator.github.io/lua.vm.js/js/lua.js
          https://daurnimator.github.io/lua.vm.js/lua.vm.js


@Lua.eval
<script>
  emscripten.print = function(x) {
    console.log(x);
  }
  L.execute(`@input`)
</script>
@end

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If you want to minimize loading effort in your LiaScript project, you can also copy this code and paste it into your main comment header, see the code in the raw file of this document.

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