In computer science, syntactic closures are an implementation strategy for a hygienic macro system. The actual arguments to a macro call are enclosed in the current environment, such that they cannot inadvertently reference bindings introduced by the macro itself.
Computer science is the study of mathematical algorithms and processes that interact with data and that can be represented as data in the form of programs. It enables the use of algorithms to manipulate, store, and communicate digital information. A computer scientist studies the theory of computation and the practice of designing software systems.
Hygienic macros are macros whose expansion is guaranteed not to cause the accidental capture of identifiers. They are a feature of programming languages such as Scheme, Dylan and Rust. The general problem of accidental capture was well known within the Lisp community prior to the introduction of hygienic macros. Macro writers would use language features that would generate unique identifiers or use obfuscated identifiers in order to avoid the problem. Hygienic macros are a programmatic solution to the capture problem that is integrated into the macro expander itself. The term "hygiene" was coined in Kohlbecker et al.'s 1986 paper that introduced hygienic macro expansion, inspired by the terminology used in mathematics.
A macro in computer science is a rule or pattern that specifies how a certain input sequence should be mapped to a replacement output sequence according to a defined procedure. The mapping process that instantiates (transforms) a macro use into a specific sequence is known as macro expansion. A facility for writing macros may be provided as part of a software application or as a part of a programming language. In the former case, macros are used to make tasks using the application less repetitive. In the latter case, they are a tool that allows a programmer to enable code reuse or even to design domain-specific languages.
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An assembly language, often abbreviated asm, is any low-level programming language in which there is a very strong correspondence between the program's statements and the architecture's machine code instructions.
Common Lisp (CL) is a dialect of the Lisp programming language, published in ANSI standard document ANSI INCITS 226-1994 (R2004). The Common Lisp HyperSpec, a hyperlinked HTML version, has been derived from the ANSI Common Lisp standard.
In mathematics, computer science, and linguistics, a formal language consists of words whose letters are taken from an alphabet and are well-formed according to a specific set of rules.
In linguistics, syntax is the set of rules, principles, and processes that govern the structure of sentences in a given language, usually including word order. The term syntax is also used to refer to the study of such principles and processes. The goal of many syntacticians is to discover the syntactic rules common to all languages.
Scheme is a programming language that supports multiple paradigms, including functional and imperative programming. It is one of the two main dialects of Lisp, alongside Common Lisp. Unlike Common Lisp, Scheme follows a minimalist design philosophy, specifying a small standard core with powerful tools for language extension.
Closure, clausure or Clojure may refer to:
In a computer language, a reserved word is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use". This is a syntactic definition, and a reserved word may have no meaning.
In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another program. The output is said to be a preprocessed form of the input data, which is often used by some subsequent programs like compilers. The amount and kind of processing done depends on the nature of the preprocessor; some preprocessors are only capable of performing relatively simple textual substitutions and macro expansions, while others have the power of full-fledged programming languages.
The C preprocessor or cpp is the macro preprocessor for the C and C++ computer programming languages. The preprocessor provides the ability for the inclusion of header files, macro expansions, conditional compilation, and line control.
TRAC Language is a programming language developed between 1959-1964 by Calvin Mooers and implemented on a PDP-10 in 1964 by L. Peter Deutsch. It was one of three "first languages" recommended by Ted Nelson in Computer Lib. TRAC T64 was used until 1984, when Mooers updated it to TRAC T84.
Perl 6 is a member of the Perl family of programming languages.
Extensible programming is a term used in computer science to describe a style of computer programming that focuses on mechanisms to extend the programming language, compiler and runtime environment. Extensible programming languages, supporting this style of programming, were an active area of work in the 1960s, but the movement was marginalized in the 1970s. Extensible programming has become a topic of renewed interest in the 21st century.
AUCTeX is an extensible package for writing and formatting TeX files in Emacs and XEmacs.
Ddoc is a compiler-embedded documentation generator and associated syntax, for the D programming language, designed by Walter Bright. Its emphasis is on being able to write documentation in code comments in a natural style, minimizing the need for embedded markup and thus improving the legibility of the code comments. It is similar in concept to Doxygen and Javadoc.
Ngalakan (Ngalakgan) is an Australian Aboriginal language of the Ngalakgan people. It has not been fully acquired by children since the 1930s. It is one of the Northern Non-Pama–Nyungan languages formerly spoken in the Roper river region of the Northern Territory. It is most closely related to Rembarrnga.
In computer science, the syntax of a computer language is the set of rules that defines the combinations of symbols that are considered to be a correctly structured document or fragment in that language. This applies both to programming languages, where the document represents source code, and markup languages, where the document represents data. The syntax of a language defines its surface form. Text-based computer languages are based on sequences of characters, while visual programming languages are based on the spatial layout and connections between symbols. Documents that are syntactically invalid are said to have a syntax error.
In computer programming, an anonymous function is a function definition that is not bound to an identifier. Anonymous functions are often arguments being passed to higher-order functions, or used for constructing the result of a higher-order function that needs to return a function. If the function is only used once, or a limited number of times, an anonymous function may be syntactically lighter than using a named function. Anonymous functions are ubiquitous in functional programming languages and other languages with first-class functions, where they fulfil the same role for the function type as literals do for other data types.
Urarina is an isolated language spoken in Peru, specifically in the Loreto Region of Northwest Peru, by the Urarina people. There are around 3,000 speakers. It uses a Latin script. It is also known as Itucali, Simacu or Shimacu.