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Programming in Lua, Fourth Edition
Roberto Ierusalimschy
Programming in Lua, Fourth Edition
Roberto Ierusalimschy
Copyright © 2016, 2003 Roberto Ierusalimschy
Feisty Duck Digital
Book Distribution
www.feistyduck.com
Licensed for the exclusive use of:
Eric Taylor <jdslkgjf.iapgjflksfg@yandex.com>
Table of Contents
About the Book ................................................................................................................. ix
I. The Basics ...................................................................................................................... 1
1. Getting Started ........................................................................................................ 4
Chunks .............................................................................................................. 4
Some Lexical Conventions ................................................................................... 6
Global Variables ................................................................................................. 7
Types and Values ................................................................................................ 7
Nil ............................................................................................................ 8
Booleans .................................................................................................... 8
The Stand-Alone Interpreter .................................................................................. 9
2. Interlude: The Eight-Queen Puzzle ............................................................................ 12
3. Numbers ............................................................................................................... 15
Numerals .......................................................................................................... 15
Arithmetic Operators .......................................................................................... 16
Relational Operators .......................................................................................... 17
The Mathematical Library ................................................................................... 18
Random-number generator .......................................................................... 18
Rounding functions .................................................................................... 18
Representation Limits ......................................................................................... 19
Conversions ...................................................................................................... 21
Precedence ....................................................................................................... 22
Lua Before Integers ........................................................................................... 22
4. Strings ................................................................................................................. 24
Literal strings .................................................................................................... 24
Long strings ..................................................................................................... 25
Coercions ......................................................................................................... 26
The String Library ............................................................................................. 27
Unicode ........................................................................................................... 29
5. Tables .................................................................................................................. 33
Table Indices .................................................................................................... 33
Table Constructors ............................................................................................. 35
Arrays, Lists, and Sequences ............................................................................... 36
Table Traversal ................................................................................................. 38
Safe Navigation ................................................................................................. 38
The Table Library ............................................................................................. 39
6. Functions .............................................................................................................. 42
Multiple Results ................................................................................................ 43
Variadic Functions ............................................................................................. 45
The function
table.unpack
............................................................................ 47
Proper Tail Calls ............................................................................................... 48
7. The External World ................................................................................................ 50
The Simple I/O Model ....................................................................................... 50
The Complete I/O Model .................................................................................... 53
Other Operations on Files ................................................................................... 54
Other System Calls ............................................................................................ 55
Running system commands ......................................................................... 55
8. Filling some Gaps .................................................................................................. 57
Local Variables and Blocks ................................................................................. 57
Control Structures .............................................................................................. 58
if then else
............................................................................................... 58
while
....................................................................................................... 59
iii
Programming in Lua, Fourth Edition
repeat
..................................................................................................... 59
Numerical
for
........................................................................................... 60
Generic
for
.............................................................................................. 60
break, return,
and
goto
..................................................................................... 61
II. Real Programming ......................................................................................................... 65
9. Closures ............................................................................................................... 68
Functions as First-Class Values ............................................................................ 68
Non-Global Functions ........................................................................................ 69
Lexical Scoping ................................................................................................ 71
A Taste of Functional Programming ..................................................................... 74
10. Pattern Matching .................................................................................................. 77
The Pattern-Matching Functions ........................................................................... 77
The function
string.find
...................................................................... 77
The function
string.match
.................................................................... 77
The function
string.gsub
...................................................................... 78
The function
string.gmatch
.................................................................. 78
Patterns ............................................................................................................ 78
Captures ........................................................................................................... 82
Replacements .................................................................................................... 83
URL encoding .......................................................................................... 84
Tab expansion ........................................................................................... 86
Tricks of the Trade ............................................................................................ 86
11. Interlude: Most Frequent Words ............................................................................. 90
12. Date and Time ..................................................................................................... 92
The Function
os.time
..................................................................................... 92
The Function
os.date
..................................................................................... 93
Date–Time Manipulation .................................................................................... 95
13. Bits and Bytes ..................................................................................................... 97
Bitwise Operators .............................................................................................. 97
Unsigned Integers .............................................................................................. 97
Packing and Unpacking Binary Data ..................................................................... 99
Binary files ..................................................................................................... 101
14. Data Structures ................................................................................................... 104
Arrays ............................................................................................................ 104
Matrices and Multi-Dimensional Arrays ............................................................... 105
Linked Lists .................................................................................................... 107
Queues and Double-Ended Queues ..................................................................... 107
Reverse Tables ................................................................................................ 108
Sets and Bags ................................................................................................. 109
String Buffers .................................................................................................. 110
Graphs ........................................................................................................... 111
15. Data Files and Serialization .................................................................................. 114
Data Files ....................................................................................................... 114
Serialization .................................................................................................... 116
Saving tables without cycles ...................................................................... 118
Saving tables with cycles .......................................................................... 119
16. Compilation, Execution, and Errors ....................................................................... 122
Compilation .................................................................................................... 122
Precompiled Code ............................................................................................ 125
Errors ............................................................................................................. 126
Error Handling and Exceptions .......................................................................... 127
Error Messages and Tracebacks .......................................................................... 128
17. Modules and Packages ........................................................................................ 131
The Function
require
.................................................................................... 132
iv

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