Gosu (programming language): Difference between revisions

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{{Short description|Programming language}}

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{{Infobox programming language

| name = Gosu

| logo = =

| caption = =

| file ext = .gs, .gsp, .gst, .gsx

| paradigm =

| released = <!-- {{11 Nov|2010}} -->

| developer = Guidewire and open source contributors

| designer = [[Guidewire Software]]

| latest release version = {{wikidata|property|reference|edit|P348}}

| developer = Guidewire and open source contributors

| latest release versiondate = 1.14.6{{Start date and age|{{wikidata|qualifier|P348|P577}}|df=no}}

| latest preview version =

| latest release date = {{start date and age|2017|04|05}} <!-- {{start date and age|YYYY|MM|DD}} -->

| latest preview versiondate = <!-- {{start date and age|YYYY|MM|DD}} -->

| typing = [[Type system#Static type-checking|static]]

| latest preview date = <!-- {{start date and age|YYYY|MM|DD}} -->

| implementations = =

| typing = [[Type system#Static type-checking|static]]

| dialects = =

| implementations =

| influenced by = [[Java (programming =language)|Java]], [[KotlinC Sharp (programming language)|KotlinC#]]

| dialects =

| influenced by = [[Java (programming language)|Java]], [[C SharpKotlin (programming language)|C#Kotlin]]

| platform = Execute on the [[Java Virtual Machine]], statically and dynamically compiles to [[Java bytecode|bytecode]]

| influenced = [[Kotlin (programming language)|Kotlin]]

| operating system = any supporting JVM

| platform = Execute on the [[Java Virtual Machine]], statically and dynamically compiles to [[Java bytecode|bytecode]]

| license = [[Apache License 2.0]]

| operating system = any supporting JVM

| website = {{URL|httphttps://gosu-lang.orggithub.io/}}

| license = [[Apache License]]

| wikibooks = =

| website = {{URL|http://gosu-lang.org/}}

| wikibooks =

}}

'''Gosu''' is a [[Type system#Static type-checking|statically-typed]] [[programming language]] that runs on the [[Java Virtual Machine]] released under the [[Apache license|Apache 2]].<ref name=slashdot>{{cite web|url=http://slashdot.org/story/10/11/09/0510258/Gosu-Programming-Language-Released-To-Public|title=Gosu Programming Language Released To Public|date=2010-11-09|publisher=[[Slashdot]]}}</ref> This general-purpose programming language is used in several [[open-source software]] projects including [https://sparkgs.github.io/ SparkGS] and [https://github.com/gosu-lang/ragnardb Ragnar DB] among several others, and is widely used in the insurance industry via [[Guidewire Software]]'s commercial products.<ref name=slashdot/><ref>{{Cite news|url=http://www.pcpro.co.uk/news/362638/gosu-brings-fresh-language-skills-to-java-virtual-platform|title=Gosu brings fresh language skills to Java Virtual Platform|publisher=[[PC Pro]]|date=2010-11-09}}</ref> The language borrows from several existing languages including [[Java (programming language)|Java]], [[C Sharp (programming language)|C#]], and [[ECMAScript]]. A notable and unique feature is its Open Type System, which allows the language to be easily extended to provide compile-time checking and IDE awareness of information that is typically checked only at runtime in most other languages. Also of note is the language's ability to serve as both a full-featured general purpose language and as a concise scripting language. For instance, Gosu has free-form Program types (.gsp files) for scripting as well as statically verified Template files (.gst files). Gosu can optionally execute these and all other types directly from source without precompilation, which also distinguishes it from other static languages.

'''Gosu''' is a [[Type system#Static type-checking|statically typed]] [[general-purpose programming language]] that runs on the [[Java Virtual Machine]]. Its influences include [[Java (programming language)|Java]], [[C Sharp (programming language)|C#]], and [[ECMAScript]]. Development of Gosu began in 2002 internally for [[Guidewire Software]], and the language saw its first community release in 2010 under the [[Apache license|Apache 2]] license.<ref name=slashdot>{{cite web|url=http://slashdot.org/story/10/11/09/0510258/Gosu-Programming-Language-Released-To-Public|title=Gosu Programming Language Released To Public|date=2010-11-09|publisher=[[Slashdot]]}}</ref>

Gosu can serve as a scripting language, having free-form Program types (.gsp files) for scripting as well as statically verified Template files (.gst files). Gosu can optionally execute these and all other types directly from source without precompilation, which also distinguishes it from other static languages.

==History==

Gosu began in 2002 as a scripting language called [['''GScript]]''' at Guidewire Software.<ref>http://www.guidewire.com {{Bare URL inline|date=August 2025}}</ref><ref>https://gosu-lang.github.io/ {{Bare URL inline|date=August 2025}}</ref> It was later renamed to '''Gosu''' by the lead developer Scott McKinney in order for the language to not be confused as a [[Google]] technology.<ref>https://groups.google.com/g/gosu-lang/c/KFvnB5dxw1A/m/qUBhSBerm3oJ {{Bare URL inline|date=August 2025}}</ref> It has been described as a [[Java (programming language)|Java]] variant that attempts to make useful improvements while retaining the fundamental utility and compatibility with Java. It was used to configure [[business logic]] in Guidewire's applications and was more of a simple rule definition language. In its original incarnation it followed [[ECMAScript]] guidelines. Guidewire enhanced the scripting language over the next 8 years, and released Gosu 0.7 beta to the community in November 2010. The 0.8 beta was released in December 2010, and 0.8.6 beta was released in mid-2011 with additional typeloaders, making Gosu capable of loading [[XML Schema (W3C)|XML schema definition]] files and XML documents as native Gosu types. The latest version is 1.10, released in January 2016, along with a new IntelliJ IDEA editor plugin.

Guidewire continues to support and use Gosu extensively within InsuranceSuite applications. Guidewire has decided to freeze the development of new Gosu programming language constructs at this time. Guidewire continues to evolve InsuranceSuite through RESTful APIs and Integration Frameworks that can be accessed using Java.

==Philosophy==

==Philosophy==

Gosu language creator and development lead, Scott McKinney, emphasizes pragmatism, found in readability and [[discoverability]], as the overriding principle inthat Gosuguides the language's design.<ref name=drdobbs>{{cite web|url=http://www.drdobbs.com/open-source/language-of-the-month-gosu/231001429#|title=Language of the Month: Gosu|date=2012-12-07|publisher=[[Dr. Dobb's Journal]]}}</ref> For instance, code readability is paramount. While the Gosu team tries to strike a balance between conciseness and readability, it favors readability as code tends to be read many times more than it is written. This simple idea has helped to keep Gosu a low-ceremony, pragmatic language. Discoverability is also a key principle that guides the language's design. With the aid of modern IDEs programmers must be able to quickly and deterministically apply static analysis to large Gosu codebases, some of them approaching 1M lines of code. As such Gosu's rich static type system is a necessary ingredient toward best of breed tooling via [[static program analysis]], rich parser feedback, intelligent [[code completion]], deterministic refactoring, usage analysis, navigation, and the like. To that end the Gosu team is highly involved in both language and tooling/IDE design.

==Syntax and Semanticsemantics==

Gosu follows a syntax resembling a combination of other languages. For instance, declarations follow more along the lines of [[Pascal (programming language)|Pascal]] with name-first grammar. Gosu classes can have functions, fields, properties, and inner classes as members. Nominal inheritance and composition via [[delegation (object-oriented programming)|delegation]] are built into the type system as well as [[structural typing]] similar to the [[Go (programming language)|Go]] programming language.

Gosu supports several file types:

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In addition to standard class types Gosu supports enums, interfaces, structures, and annotations.

Program files facilitate Gosu as a scripting language. For example, Gosu's Hello, World! is a simple one-line program:<sourcesyntaxhighlight lang="gosu">

print("Hello, World!")

</syntaxhighlight>

</source>

Gosu classes are also executable a la Java:<syntaxhighlight lang="gosu">

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}

}

</syntaxhighlight>

</syntaxhighlight>Enhancements let you add additional functions and properties to other types, including built-in Java types such as String, List, etc. This example demonstrates adding a print() function to java.lang.String.<syntaxhighlight lang="gosu">

===Data types===

</syntaxhighlight>A unique feature of Gosu is its Open Type System, which allows the language to be easily extended to provide compile-time checking and IDE awareness of information that is typically checked only at runtime in most other languages. Enhancements let you add additional functions and properties to other types, including built-in Java types such as String, List, etc. This example demonstrates adding a print() function to java.lang.String.<syntaxhighlight lang="gosu">

enhancement MyStringEnhancement : String {

function print() {

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</syntaxhighlight>Now you can tell a String to print itself:<syntaxhighlight lang="gosu">

"Echo".print()

</syntaxhighlight>The combination of [[Closure (computer programming)|closures]] and enhancements provide a powerful way of coding with Collections. The overhead of Java streams is unnecessary with Gosu:

<sourcesyntaxhighlight lang="gosu">

var list = {1, 2, 3}

var result = list.where(\ elem -> elem >= 2)

print(result)

</syntaxhighlight>

</source>

==Uses==

This general-purpose programming language is used primarily in [[Guidewire Software]]'s commercial products.

==References==

{{Portal|Free software}}

{{Reflist}}

==Further reading==

* {{cite web|url=http://wiki.jvmlangsummit.com/images/2/24/2011_Gross.pdf|title=Language Features As A Library: Using Gosu's Open Type System With External DSLs|first=Carson|last=Gross|work=JVM Language Summit 2011|publisher=Oracle|date=2011-07-18}} [https://video.oracle.com/detail/videos/featured-videos/video/1113248938001 Video]

==External links==

*[httphttps://gosu-lang.orggithub.io/ Official website]

*[https://github.com/gosu-lang/gosu-lang Source code repository]

*[http://www.sdtimes.com/content/article.aspx?ArticleID=35058&page=2&print Sdtimes.com]

{{Portal bar|Free and open-source software}}

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[[Category:Software using the Apache license]]

[[Category:Programming languages created in 2002]]

[[Category:2002 software]]

[[Category:High-level programming languages]]

[[Category:Cross-platform free software]]

[[Category:Free compilers and interpretersopen source compilers]]

[[Category:Statically typed programming languages]]