CodeFlow an advanced IDE for Lua - Jean-Luc Jumpertz (Celedev)
CODEFLOW an advanced IDE for Lua. LUA WORKSHOP 2015. October 16 2015. Jean-Luc Jumpertz @JLJump founder celedev @celedev
OEM7 Lua Script Development Kit User Guide
The ZeroBrane IDE will then be able to control the Lua interpreter on the receiver: 12. Use the debugging controls within the IDE to step through the code and
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Lua is an open source language built on top of C programming language. Lua has its value across multiple platforms ranging from large server Lua IDE .
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Lua IDE v3 When creating a custom Lua script for use in Kaseya Network Monitor there is a number of ... from the IDE that can utilize user DSN as well.
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L'investissement est favorable à la croissance et à l'emploi. L'analyse économique nous apprend que l'investissement est favorable à la croissance et à l'emploi, d'abord parce qu'il permet d'augmenter la demande de biens et de services, ensuite parce qu'il permet d'améliorer les conditions de l'offre.
Copyright 2015 by Tutorials Point (I) Pvt. Ltd.
All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at contact@tutorialspoint.com Lua iiAbout the Tutorial ..................................................................................................................................... i
Audience .................................................................................................................................................... i
Prerequisites .............................................................................................................................................. i
Copyright & Disclaimer .............................................................................................................................. i
Table of Contents ...................................................................................................................................... ii
1. OVERVIEW ............................................................................................................................ 1
Features .................................................................................................................................................... 1
How Lua is Implemented? ......................................................................................................................... 1
Learning Lua .............................................................................................................................................. 2
Some Uses of Lua ...................................................................................................................................... 2
2. ENVIRONMENT ..................................................................................................................... 3
Try it Option Online .................................................................................................................................. 3
Local Environment Setup .......................................................................................................................... 3
Text Editor ................................................................................................................................................ 3
The Lua Interpreter ................................................................................................................................... 4
The Lua Compiler ...................................................................................................................................... 4
Installation on Windows ........................................................................................................................... 4
Installation on Linux.................................................................................................................................. 4
Installation on Mac OS X ........................................................................................................................... 5
Lua IDE ...................................................................................................................................................... 5
3. BASIC SYNTAX ....................................................................................................................... 7
First Lua Program ...................................................................................................................................... 7
Tokens in Lua ............................................................................................................................................ 8
Comments ................................................................................................................................................ 9
Lua iiiIdentifiers ................................................................................................................................................. 9
Keywords .................................................................................................................................................. 9
Whitespace in Lua ................................................................................................................................... 10
4. VARIABLES .......................................................................................................................... 11
Variable Definition in Lua ........................................................................................................................ 11
Variable Declaration in Lua ..................................................................................................................... 12
Lvalues and Rvalues in Lua ...................................................................................................................... 13
5. DATA TYPES ........................................................................................................................ 14
Type Function ......................................................................................................................................... 14
6. OPERATORS ........................................................................................................................ 16
Arithmetic Operators .............................................................................................................................. 16
Relational Operators ............................................................................................................................... 17
Logical Operators .................................................................................................................................... 20
Misc Operators ....................................................................................................................................... 22
Operators Precedence in Lua .................................................................................................................. 22
7. LOOPS ................................................................................................................................. 25
while loop ............................................................................................................................................... 26
for loop ................................................................................................................................................... 27
repeat...until loop ................................................................................................................................... 29
nested loops ........................................................................................................................................... 31
Loop Control Statement .......................................................................................................................... 32
break statement ..................................................................................................................................... 33
The Infinite Loop ..................................................................................................................................... 34
8. DECISION MAKING .............................................................................................................. 35
if statement ............................................................................................................................................ 36
Lua ivif...else statement ................................................................................................................................... 37
The if...else if...else Statement ................................................................................................................ 39
nested if statements ............................................................................................................................... 40
9. FUNCTIONS ......................................................................................................................... 42
Defining a Function ................................................................................................................................. 42
Function Arguments ................................................................................................................................ 43
Calling a Function .................................................................................................................................... 43
Assigning and Passing Functions ............................................................................................................. 44
Function with Variable Argument ........................................................................................................... 45
10. STRINGS .............................................................................................................................. 46
String Manipulation ................................................................................................................................ 47
Case Manipulation .................................................................................................................................. 48
Replacing a Substring .............................................................................................................................. 48
Finding and Reversing ............................................................................................................................. 49
Formatting Strings .................................................................................................................................. 49
Character and Byte Representations ....................................................................................................... 50
Other Common Functions ....................................................................................................................... 51
11. ARRAYS ............................................................................................................................... 52
One-Dimensional Array ........................................................................................................................... 52
Multi-Dimensional Array ......................................................................................................................... 53
12. ITERATORS .......................................................................................................................... 56
Generic For Iterator ................................................................................................................................ 56
Stateless Iterators ................................................................................................................................... 56
Stateful Iterators ..................................................................................................................................... 58
Lua v13. TABLES ................................................................................................................................ 60
Introduction ............................................................................................................................................ 60
Representation and Usage ...................................................................................................................... 60
Table Manipulation ................................................................................................................................. 62
Table Concatenation ............................................................................................................................... 62
Insert and Remove .................................................................................................................................. 63
Sorting Tables ......................................................................................................................................... 64
14. MODULES ............................................................................................................................ 66
What is a Module? .................................................................................................................................. 66
Specialty of Lua Modules ........................................................................................................................ 66
The require Function ............................................................................................................................... 67
Things to Remember ............................................................................................................................... 68
Old Way of Implementing Modules ........................................................................................................ 68
15. METATABLES ....................................................................................................................... 70
__index ................................................................................................................................................... 70
__newindex ............................................................................................................................................ 71
Adding Operator Behavior to Tables ....................................................................................................... 72
__call ...................................................................................................................................................... 74
__tostring ............................................................................................................................................... 75
16. COROUTINES ....................................................................................................................... 76
Introduction ............................................................................................................................................ 76
Functions Available in Coroutines ........................................................................................................... 76
What Does the Above Example Do? ........................................................................................................ 78
Another Coroutine Example .................................................................................................................... 78
Lua vi17. FILE I/O................................................................................................................................ 81
Implicit File Descriptors .......................................................................................................................... 82
Explicit File Descriptors ........................................................................................................................... 83
18. ERROR HANDLING ............................................................................................................... 86
Need for Error Handling .......................................................................................................................... 86
Assert and Error Functions ...................................................................................................................... 87
pcall and xpcall ....................................................................................................................................... 88
19. DEBUGGING ........................................................................................................................ 90
Debugging - Example .............................................................................................................................. 93
Debugging Types ..................................................................................................................................... 94
Graphical Debugging ............................................................................................................................... 95
20. GARBAGE COLLECTION ....................................................................................................... 96
Garbage Collector Pause ......................................................................................................................... 96
Garbage Collector Step Multiplier ........................................................................................................... 96
Garbage Collector Functions ................................................................................................................... 96
21. OBJECT ORIENTED ............................................................................................................... 99
Introduction to OOP................................................................................................................................ 99
Features of OOP ...................................................................................................................................... 99
OOP in Lua .............................................................................................................................................. 99
A Real World Example........................................................................................................................... 100
Creating a Simple Class ......................................................................................................................... 100
Creating an Object ................................................................................................................................ 101
Accessing Properties ............................................................................................................................. 101
Accessing Member Function ................................................................................................................. 101
Complete Example ................................................................................................................................ 101
Lua viiInheritance in Lua ................................................................................................................................. 102
Overriding Base Functions .................................................................................................................... 103
Inheritance Complete Example ............................................................................................................. 103
22. WEB PROGRAMMING ....................................................................................................... 106
Applications and Frameworks ............................................................................................................... 106
Orbit ..................................................................................................................................................... 106
Creating Forms ...................................................................................................................................... 109
WSAPI ................................................................................................................................................... 110
Xavante ................................................................................................................................................. 111
Lua Web Components ........................................................................................................................... 113
Ending Note .......................................................................................................................................... 113
23. DATABASE ACCESS ............................................................................................................ 115
MySQL db Setup ................................................................................................................................... 115
Importing MySQL .................................................................................................................................. 115
Setting up Connection ........................................................................................................................... 115
Execute Function................................................................................................................................... 116
Create Table Example ........................................................................................................................... 116
Insert Statement Example ..................................................................................................................... 117
Update Statement Example .................................................................................................................. 117
Delete Statement Example ................................................................................................................... 117
Select Statement Example .................................................................................................................... 117
A Complete Example ............................................................................................................................. 118
Performing Transactions ....................................................................................................................... 119
Start Transaction................................................................................................................................... 119
Rollback Transaction ............................................................................................................................. 119
Commit Transaction .............................................................................................................................. 119
Lua viiiImporting SQLite ................................................................................................................................... 120
Setting Up Connection .......................................................................................................................... 120
Execute Function................................................................................................................................... 120
Create Table Example ........................................................................................................................... 120
Insert Statement Example ..................................................................................................................... 121
Select Statement Example .................................................................................................................... 121
A Complete Example ............................................................................................................................. 121
24. GAME PROGRAMING ........................................................................................................ 124
Corona SDK ........................................................................................................................................... 124
Gideros Mobile ..................................................................................................................................... 125
ShiVa3D ................................................................................................................................................ 125
Moai SDK .............................................................................................................................................. 126
LOVE ..................................................................................................................................................... 126
CryEngine .............................................................................................................................................. 126
An Ending Note ..................................................................................................................................... 127
25. STANDARD LIBRARIES ........................................................................................................ 128
Basic Library .......................................................................................................................................... 128
Modules Library .................................................................................................................................... 131
String manipulation .............................................................................................................................. 132
Table manipulation ............................................................................................................................... 132
File Input and output ............................................................................................................................ 132
Debug facilities ..................................................................................................................................... 132
26. MATH LIBRARY .................................................................................................................. 133
Trigonometric Functions ....................................................................................................................... 135
Other Common math Functions ............................................................................................................ 136
Lua ix27. OPERATING SYSTEM FACILITIES......................................................................................... 138
Common OS functions .......................................................................................................................... 139
Lua 10 Lua is an extensible, lightweight programming language written in C. It started as an in-house project in 1993 by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, andWaldemar Celes.
It was designed from the beginning to be a software that can be integrated with the code written in C and other conventional languages. This integration brings many benefits. It does not try to do what C can already do but aims at offering what C is not good at: a good distance from the hardware, dynamic structures, no redundancies, ease of testing and debugging. For this, Lua has a safe environment, automatic memory management, and good facilities for handling strings and other kinds of data with dynamic size. Lua provides a set of unique features that makes it distinct from other languages.These include:
Extensible
Simple
Efficient
Portable
Free and open
Example Code
print("Hello World!") Lua consists of two parts - the Lua interpreter part and the functioning software system. The functioning software system is an actual computer application that can interpret programs written in the Lua programming language. The Lua interpreter is1. OVERVIEW
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