Gosu (programming language): Difference between revisions

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{{Short description|Programming language}}

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{{Infobox programming language

| name = Gosu

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

| developer = Guidewire and open source contributors

| latest release version = 1.14.6{{wikidata|property|reference|edit|P348}}

| latest release date = {{startStart date and age|2017|04|05}} <!-- {{start date and agewikidata|YYYYqualifier|MMP348|DDP577}}|df=no}} -->

| latest preview version =

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

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| operating system = any supporting JVM

| license = [[Apache License 2.0]]

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

| wikibooks =

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'''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, Gosu's rich static type system is a necessary ingredient toward best of breed tooling via [[codestatic readabilityprogram analysis]], wonrich outparser infeedback, design[[code contestscompletion]], betweendeterministic readabilityrefactoring, usage analysis, navigation, and [[concision]].<ref>{{citethe web|url=https://sdtimeslike.com/couchdb/the-five-next-big-things-in-open-source/2/|title=

The five “Next Big Things” in open source|date=2010-12-09|accessdate=2018-09-11|publisher=Software Development Times}}</ref> This emphasis was partially due to McKinney's need for a [[web template system]]; and Gosu's is influenced by that of [[Apache Velocity|Velocity]] and [[JavaServer Pages]]. [[XML Schema Definition]]s are also heavily integrated into the language, as well as [[object-relational mapping]]s, because of the business requirements into which Gosu was born.

Discoverability is also a key principle that guides the language's design. As such Gosu's rich static type system is a necessary ingredient toward best of breed tooling via [[static programming analysis]], rich parser feedback, [[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 semantics==

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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==References==

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

{{Reflist}}

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==External links==

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

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

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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]]