stevedonovan

--[[
A Lua module that defines a little DSL for generating CSS

-- csstest.lua
require 'css'

width = 500
lmargin = 50
leftm = 150
gap = 10

stevedonovan

use std::rc::Rc;
use std::cell::{RefCell,Ref, RefMut};
use std::ops::Deref;
use std::fmt;

#[derive(Clone)]
struct Shared<T> {
    v: Rc<RefCell<T>>
}

stevedonovan

-- translate Markdown with code blocks into HTML
-- with syntax highlighting.
-- If article.md was the source, Lua was the language and we
-- wanted a preview:
-- lua prettify.lua article lua preview
-- Without the last argument it will just write out the HTML body.
-- Languages supported are 'lua', 'cpp', 'java' and 'go
-- Indented code blocks may begin with an explicit @lang name line;
-- if you do this then mark every code block explicitly
-- e.g

stevedonovan

-----------------
-- Microlight - a very compact Lua utilities module
--
-- Steve Donovan, 2012; License MIT
-- @module ml

local ml = {}

--- String utilties.
-- @section string

stevedonovan

-- This allows a more restricted module() style; the key feature
-- is that each module is loaded in a custom environment, and the actual module
-- table is a copy of that environment after initial load.

-- clone _G so that globals from the program don't invade the module
local lua_libs = {}
for k,v in pairs(package.loaded._G) do
  lua_libs[k] = v
end

stevedonovan

#!/usr/bin/env lua

--[[  -- installing LDoc
function install()
--    requires('pl','Penlight')
--    install_script 'ldoc'
end
--]]

-- --[[

stevedonovan

package csvdata
// csvdata complements the csv package by allowing you to map a custom structure to
// the columns of data in a CSV file. The struct needs to be annotated so that each
// field can match a column in the data
//
//    type Person struct {
//       FirstName string `field:"First Name"`
//       Second_Name string
//       Age int
//    }

stevedonovan

package com.example.testchart;

import java.util.*;
import java.io.*;
import java.text.DateFormat;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.*;

stevedonovan

#!/usr/bin/lua
-- Flatten ALL those tidy tables and add environment lookup
local tables = {math,io,os,string,bit32}
setmetatable(_G,{
	__index = function(t,key)
		for _,m in ipairs(tables) do
			local v = m[key]
			if v ~= nil then return v end
		end	
		return os.getenv(key)

stevedonovan

What is a Trait?

In Rust, types containing data - structs, enums and any other 'aggregate' types like tuples and arrays - are dumb. They may have methods but that is just a convenience; they are just functions. Types have no relationship with each other.

Traits are the abstract mechanism for adding functionality to types and establishing relationships between them.