Lua supports coroutines on all systems, even those that do not support threads. The type table implements associative arrays, that is, arrays that can be indexed not only with numbers, but with any value (except nil mom ). Tables can be heterogeneous ; that is, they can contain values of all types (except nil ). Tables are the sole data structuring mechanism in lua; they can be used to represent ordinary arrays, symbol tables, sets, records, graphs, trees, etc. To represent records, lua uses the field name as an index. The language supports this representation by providing me as syntactic sugar for a"name". There are several convenient ways to create tables in lua (see.5.7 ). Like indices, the value of a table field can be of any type (except nil ). In particular, because functions are first-class values, table fields can contain functions.
Lua is 8-bit clean: strings can contain any 8-bit character, including embedded zeros 0 (see.1 ). Lua can call (and manipulate) functions written in lua and functions written in C (see.5.8 ). The type userdata is provided to allow arbitrary C data to be stored in lua variables. This type corresponds to a block of raw memory and has no pre-defined operations in lua, except assignment and identity test. However, by using metatables, the programmer can define operations for userdata values (see.8 ). Userdata values cannot be created or modified in lua, only through the C API. This guarantees the integrity of data owned by the host program. The type thread represents independent threads of execution and it is used to implement coroutines writing (see.11 ). Do not confuse lua threads with operating-system threads.
This means that all values can be stored in variables, passed as arguments to other functions, and returned as results. There are eight basic types in lua: nil, boolean, number, string, function, userdata, thread, and table. Nil is the type of the value nil, whose main property is to be different from any other value; it usually represents the absence of a useful value. Boolean is the type of the values false and true. Both nil and false make a condition false; any other value makes it true. Number represents real (double-precision floating-point) numbers. (It is easy to build lua interpreters that use other internal representations for numbers, such as single-precision float or long integers; see file luaconf. H.) String represents arrays of characters.
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Literals in this bracketed form can run for several lines, do not interpret any escape sequences, and ignore long brackets of any other level. They can contain anything except a closing bracket of the proper level. For convenience, when the opening long bracket is ownership immediately followed by a newline, the newline is not included in the string. As an example, in a system using ascii (in which 'a' is coded as 97, newline is coded as 10, and '1' is coded as 49 the five literal strings below denote the same string: a 'alon123 a "alon123" a '97lo1004923 a alo 123" a alo 123". Lua also accepts integer hexadecimal constants, by prefixing them with. Examples of valid numerical constants are.0.1416 314.16e-2.31416E1 0xff 0x56 A comment starts with a double hyphen (-) anywhere outside a string. If the text immediately after - is not an opening long bracket, the comment is a short comment, which runs until the end of the line.
Otherwise, it is a long comment, which runs until the corresponding closing long bracket. Long comments are frequently used to disable code temporarily. Lua is a dynamically typed language. This means that variables do not have types; only values. There are no type definitions in the language. All values carry their own type. All values in lua are first-class values.
This coincides with the definition of names in most languages. (The definition of letter depends on the current locale: any character considered alphabetic by the current locale can be used in an identifier.) Identifiers are used to name variables and table fields. The following keywords are reserved and cannot be used as names: and break do else elseif end false for function if in local nil not or repeat return then true until while lua is a case-sensitive language: and is a reserved word, but And and. As a convention, names starting with an underscore followed by uppercase letters (such as _version ) are reserved for internal global variables used by lua. The following strings denote other tokens: - * / ( ) ;. Literal strings can be delimited by matching single or double"s, and can contain the following C-like escape sequences: 'a' (bell 'b' (backspace 'f' (form feed 'n' (newline 'r' (carriage return 't' (horizontal tab 'v' (vertical tab (backslash "tion mark double" and (apostrophe single.
Moreover, a backslash followed by a real newline results in a newline in the string. A character in a string can also be specified by its numerical value using the escape sequence ddd, where ddd is a sequence of up to three decimal digits. (Note that if a numerical escape is to be followed by a digit, it must be expressed using exactly three digits.) Strings in lua can contain any 8-bit value, including embedded zeros, which can be specified as '0'. Literal strings can also be defined using a long format enclosed by long brackets. We define an opening long bracket of level n as an opening square bracket followed by n equal signs followed by another opening square bracket. So, an opening long bracket of level 0 is written as, an opening long bracket of level 1 is written as, and. A closing long bracket is defined similarly; for instance, a closing long bracket of level 4 is written. A long string starts with an opening long bracket of any level and ends at the first closing long bracket of the same level.
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For a discussion of the restaurant decisions behind the design of lua, see the technical papers available at lua's web site. For a detailed introduction to programming in lua, see roberto's book, programming in lua (Second Edition). This section describes the lexis, the syntax, and the semantics of lua. In other words, this section describes which tokens are valid, how they can be combined, and what their combinations mean. The language constructs will be explained using the usual extended bnf notation, in which a means 0 or more a 's, and a means an optional. Non-terminals are shown like non-terminal, keywords are shown like kword, and other terminal symbols are shown like ´. The complete syntax of lua can be found in 8 hazlitt at the end of this manual. Names (also called identifiers ) in lua can be any string of letters, digits, and underscores, not beginning with a digit.
Lua is implemented as a library, written in clean, c (that is, in the common subset of ansi C and C). Being an extension language, lua has no notion of a "main" program: it only works embedded in a host myths client, called the embedding program or simply the host. This host program can invoke functions to execute a piece of lua code, can write and read lua variables, and can register C functions to be called by lua code. Through the use of C functions, lua can be augmented to cope with a wide range of different domains, thus creating customized programming languages sharing a syntactical framework. The lua distribution includes a sample host program called lua, which uses the lua library to offer a complete, stand-alone lua interpreter. Lua is free software, and is provided as usual with no guarantees, as stated in its license. The implementation described in this manual is available at lua's official web site,. Like any other reference manual, this document is dry in places.
use only and are not to be resold or distributed. I want you to love your purchase as much as I loved created it! If you experience a problem with downloading or using your file, please contact me and I will resolve it for you. Lua.1 Reference manual by roberto ierusalimschy, luiz henrique de figueiredo, waldemar Celes. Freely available under the terms of the. Contents index other versions english português español, lua is an extension programming language designed to support general procedural programming with data description facilities. It also offers good support for object-oriented programming, functional programming, and data-driven programming. Lua is intended to be used as a powerful, light-weight scripting language for any program that needs one.
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