Three months after the last major release, Ceylon 1.2.1 is a new maintenance release, with almost 100 issues closed, including new features, improvements and bug fixes such as:

• you can now iterate java.lang.Iterable values in for statements and use java.lang.AutoCloseable values in try statements,
• support for Java 9 and Jigsaw modules,
• experimental support for type functions on the JVM,
• reduced run-time dependencies for your Ceylon program,
• better interoperation with JavaScript arrays,
• better compatibility with previous and future Ceylon releases.

Note that for the JVM backend, this release is backwards-compatible with the previous major release (1.2.0), which means you can use modules compiled with 1.2.0 on a 1.2.1 distribution out of the box. This is not as easy the other way around, if you want to run modules compiled for 1.2.1 on a 1.2.0 distribution, which is why we recommend you upgrade to 1.2.1.

Sadly, on the JavaScript backend, we had to break binary compatibility to fix serious interoperation issues, and so modules compiled for 1.2.1 and 1.2.0 are not compatible. We recommend you upgrade your distribution to 1.2.1 and recompile your modules.

About Ceylon

Ceylon is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines. The language features a flexible and very readable syntax, a unique and uncommonly elegant static type system, a powerful module architecture, and excellent tooling, including an awesome Eclipse-based IDE.

Ceylon enables the development of cross-platform modules that execute portably in both virtual machine environments. Alternatively, a Ceylon module may target one or the other platform, in which case it may interoperate with native code written for that platform.

In the box

This release includes:

• a complete language specification that defines the syntax and semantics of Ceylon in language accessible to the professional developer,
• a command line toolset including compilers for Java and JavaScript, a documentation compiler, a test runner, a WAR archive packager, and support for executing modular programs on the JVM and Node.js,
• a powerful module architecture for code organization, dependency management, and module isolation at runtime,
• the language module, our minimal, cross-platform foundation of the Ceylon SDK, and
• a full-featured Eclipse-based integrated development environment.

Language

Ceylon is a highly understandable object-oriented language with static typing. The language features:

• an emphasis upon readability and a strong bias toward omission or elimination of potentially-harmful or potentially-ambiguous constructs and toward highly disciplined use of static types,
• an extremely powerful and uncommonly elegant type system combining subtype and parametric polymorphism with:
  • first-class union and intersection types,
  • both declaration-site and use-site variance, and
  • the use of principal types for local type inference and flow-sensitive typing,
• a unique treatment of function and tuple types, enabling powerful abstractions, along with the most elegant approach to null of any modern language,
• first-class constructs for defining modules and dependencies between modules,
• a very flexible syntax including comprehensions and support for expressing tree-like structures,
• fully-reified generic types, on both the JVM and JavaScript virtual machines, and a unique typesafe metamodel.

More information about these language features may be found in the feature list and quick introduction.

IDE

Ceylon IDE now features the following improvements, along with many bugfixes and a number of performance enhancements:

• improved documentation hover,
• better UI responsiveness,
• support running on Java 9.

A number of important subsystems have been abstracted and rewritten in Ceylon, to support the ongoing development of the new IntelliJ-based IDE for Ceylon.

SDK

The platform modules, recompiled for 1.2.1, are available in the shared community repository, Ceylon Herd.

This release introduces several new platform modules:

• ceylon.numeric is a cross-platform module containing math operations for Integer and Float. In time it will replace parts of the JVM-only ceylon.math module.
• ceylon.decimal is a JVM-only module (but soon to be cross-platform) containing arbitrary-length decimal support. In time it will replace parts of the JVM-only ceylon.math module.
• ceylon.whole is a cross-platform module containing arbitrary-length integer support. In time it will replace parts of the JVM-only ceylon.math module.
• ceylon.random is a cross-platform module containing random number generators. In time it will replace parts of the JVM-only ceylon.math module.
• ceylon.interop.browser contains JavaScript-only interoperation functions and types for the DOM, HTML and XMLHttpRequest.

Along with several API enhancements and bugfixes, including:

• Many new features for ceylon.test, the Ceylon Test Suite.
• Performance improvement of the ceylon.json parser.

Web IDE

You can try Ceylon using the Web IDE, featuring syntax highlighting, interactive error reporting, autocompletion, online documentation, and persistence and code sharing via Gist.

The Web IDE serves a dual purpose as a standard example demonstrating the use of Ceylon for web application development and deployment to the OpenShift cloud platform.

Community

The Ceylon community site, http://ceylon-lang.org, includes documentation, and information about getting involved.

Source code

The source code for Ceylon, its specification, and its website, is freely available from GitHub.

Information about Ceylon's open source licenses is available here.

Issues

Bugs and suggestions may be reported in GitHub's issue tracker.

Migrating from Ceylon 1.2.0

Migration from Ceylon 1.2.0 is easy. To recompile a module for 1.2.1:

• First ensure that its dependencies have also been recompiled.
• If it imports a Ceylon SDK platform module, upgrade the version number specified by the module import statement from "1.2.0" to "1.2.1" .
• If it was compiled against Ceylon 1.2.0 you should still be able to use it in 1.2.1 for the JVM backend, as it is backwards-compatible. Sadly, this is not the case for the JavaScript backend, and so you will need to recompile your modules with 1.2.1.

Acknowledgement

As always, we're deeply grateful to the community volunteers who contributed a substantial part of the current Ceylon codebase, working in their own spare time. The following people have contributed to Ceylon:

Gavin King, Stéphane Épardaud, Tako Schotanus, Tom Bentley, David Festal, Enrique Zamudio, Bastien Jansen, Emmanuel Bernard, Aleš Justin, Tomáš Hradec, James Cobb, Ross Tate, Max Rydahl Andersen, Mladen Turk, Lucas Werkmeister, Roland Tepp, Diego Coronel, Matej Lazar, John Vasileff, Toby Crawley, Julien Viet, Loic Rouchon, Stephane Gallès, Ivo Kasiuk, Corbin Uselton, Paco Soberón, Michael Musgrove, Daniel Rochetti, Henning Burdack, Luke deGruchy, Rohit Mohan, Griffin DeJohn, Casey Dahlin, Alexander Altman, Alexander Zolotko, Alex Szczuczko, Andrés G. Aragoneses, Anh Nhan Nguyen, Brice Dutheil, Carlos Augusto Mar, Charles Gould, Chris Gregory, klinger, Martin Voelkle, Mr. Arkansas, Paŭlo Ebermann, Vorlent, Akber Choudhry, Renato Athaydes, Flavio Oliveri, Michael Brackx, Brent Douglas, Lukas Eder, Markus Rydh, Julien Ponge, Pete Muir, Nicolas Leroux, Brett Cannon, Geoffrey De Smet, Guillaume Lours, Gunnar Morling, Jeff Parsons, Jesse Sightler, Oleg Kulikov, Raimund Klein, Sergej Koščejev, Chris Marshall, Simon Thum, Maia Kozheva, Shelby, Aslak Knutsen, Fabien Meurisse, Sjur Bakka, Xavier Coulon, Ari Kast, Dan Allen, Deniz Türkoglu, F. Meurisse, Jean-Charles Roger, Johannes Lehmann, allentc, Nikolay Tsankov, Chris Horne, Gabriel Mirea, Georg Ragaller, Harald Wellmann, klinger, Oliver Gondža, Stephen Crawley, Byron Clark, Francisco Reverbel, Jonas Berlin, Luke Hutchison, Nikita Ostroumov, Santiago Rodriguez, Sean Flanigan.

Introducing the first Ceylon IDE maintenance update

Just after the release of Ceylon 1.2.0, we started managing a maintenance branch of the IDE-related code, that will always be fully compatible with the last release of the Ceylon (Command line distribution and SDK).

This way we've already been able to very easily backport to this branch many bug fixes or enhancements implemented on the main development branch.

As a result, the first maintenance update of the Ceylon IDE plugin for Eclipse, which fixes about 30 issues, has just been published onto the main Ceylon IDE update site.

So if you currently use the version 1.2.0 of the Ceylon IDE Eclipse plugin, simply run the Check For Updates command in the Eclipse Help menu, and Eclipse should propose you to update the Ceylon IDE features.

And if you still don't use the Ceylon IDE Eclipse plugin, just install it and give it a try now.

Source tracking

Of course each maintenance update will be tagged inside the GitHub source repositories.

So as soon as we know the version of the Ceylon IDE feature, visible from the Eclipse About dialog:

we can immediately checkout the precise source code corresponding to a Ceylon IDE installation.

This will help us reproducing more easily, and fixing more quickly, any issue encountered on the production Ceylon IDE.

Maintenance update release notes

Detailed release notes of this maintenance update can be found here, and related commits can be found here.

Issues

Bugs and suggestions may be reported in GitHub's issue tracker.

About Ceylon

Ceylon is a highly understandable object-oriented language with static typing. The language features:

• an emphasis upon readability and a strong bias toward omission or elimination of potentially-harmful or potentially-ambiguous constructs and toward highly disciplined use of static types,
• an extremely powerful and uncommonly elegant type system combining subtype and parametric polymorphism with:
  • first-class union and intersection types,
  • both declaration-site and use-site variance, and
  • the use of principal types for local type inference and flow-sensitive typing,
• a unique treatment of function and tuple types, enabling powerful abstractions, along with the most elegant approach to null of any modern language,
• first-class constructs for defining modules and dependencies between modules,
• a very flexible syntax including comprehensions and support for expressing tree-like structures,
• fully-reified generic types, on both the JVM and JavaScript virtual machines, and a unique typesafe metamodel.

More information about these language features may be found in the feature list and quick introduction.

After a full year in development, and with more than 1500 issues closed, Ceylon 1.2.0 brings new language features, including:

• named constructors,
• serialization,
• native declarations,
• improved flow-sensitive typing,
• destructuring for tuples and entries
• let, switch, if, and object expressions, and
• more powerful annotation constraints.

Furthermore, the typechecker and JavaScript backend now support type functions as an experimental feature.

Also part of this release are enhancements to the tooling, such as:

• a new debugger for Ceylon, and
• the Java EE packaging command, ceylon war.

As always, this release incorporates hundreds of other bugfixes and enhancements.

About Ceylon

Ceylon is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines. The language features a flexible and very readable syntax, a unique and uncommonly elegant static type system, a powerful module architecture, and excellent tooling, including an awesome Eclipse-based IDE.

Ceylon enables the development of cross-platform modules that execute portably in both virtual machine environments. Alternatively, a Ceylon module may target one or the other platform, in which case it may interoperate with native code written for that platform.

In the box

This release includes:

• a complete language specification that defines the syntax and semantics of Ceylon in language accessible to the professional developer,
• a command line toolset including compilers for Java and JavaScript, a documentation compiler, a test runner, a WAR archive packager, and support for executing modular programs on the JVM and Node.js,
• a powerful module architecture for code organization, dependency management, and module isolation at runtime,
• the language module, our minimal, cross-platform foundation of the Ceylon SDK, and
• a full-featured Eclipse-based integrated development environment.

Language

Ceylon is a highly understandable object-oriented language with static typing. The language features:

• an emphasis upon readability and a strong bias toward omission or elimination of potentially-harmful or potentially-ambiguous constructs and toward highly disciplined use of static types,
• an extremely powerful and uncommonly elegant type system combining subtype and parametric polymorphism with:
  • first-class union and intersection types,
  • both declaration-site and use-site variance, and
  • the use of principal types for local type inference and flow-sensitive typing,
• a unique treatment of function and tuple types, enabling powerful abstractions, along with the most elegant approach to null of any modern language,
• first-class constructs for defining modules and dependencies between modules,
• a very flexible syntax including comprehensions and support for expressing tree-like structures,
• fully-reified generic types, on both the JVM and JavaScript virtual machines, and a unique typesafe metamodel.

More information about these language features may be found in the feature list and quick introduction.

This release introduces the following new language features and improvements:

• named constructors,
• support for serialization libraries in the metamodel,
• the native annotation, which allows the use of platform-dependent code in cross-platform modules
• improvements to flow-sensitive typing,
• destructuring for tuples and entries,
• let, switch, and if expressions,
• inline object expressions,
• more powerful annotation constraints,
• type argument inference for function references,
• an improved algorithm for type argument inference in invocation expressions,
• improvements to analysis of disjointness for sequence types,
• new type abbreviations, T[N] and T(*A),
• an abbreviated syntax for identifying the containing `package`, `module`, `class`, or `interface`,
• inline variable defininition in switch
• the ability to directly import members of a singleton object,
• relaxation of type constraint checking where unnecessary to ensure soundness, and
• experimental support for type functions (higher-order generics) and references to generic functions (higher-rank polymorphism).

Language module

For Ceylon 1.2, the following new APIs were introduced to the language module:

• the map() and set() functions allow creation of immutable Maps and Sets with no dependency to ceylon.collection,
• distinct, frequences(), group(), tabulate(), and summarize() were added to Iterable,
• getOrDefault(), defaultNullItems(), and coalescedMap were added to Map,
• Collection.permutations() was added,
• formatFloat() was added,
• the Contextual interface was added, a cross-platform abstraction of thread-local values,
• some operations of List were split out onto the new SearchableList interface, and
• arrayOfSize() was deperecated and replaced with the constructor Array.ofSize().

Furthermore, some native implementation code has been rewritten in Ceylon using native.

Compiler and command line tools

Enhancements to the Java compiler include:

• much improved interoperation with Maven, including support for overriding module metadata with overrides.xml, and --flat-classpath and --auto-export-maven-dependencies,
• all compiled classes are now Serializable and have default constructors, allowing much smoother interoperation with certain Java frameworks,
• improved interoperation with Java annotations, and
• basic support for interoperation with libraries written in Scala.

The JavaScript compiler now supports type functions, allowing the use of higher-order and higher-rank polymorphism in Ceylon. These experimental features are not yet supported by the Java compiler.

There are several new features and improvements to the command line toolset:

• the ceylon war command repackages a module as a Java EE WAR archive,
• the ceylon browse command opens module documentation in the browser,
• multiple commands can be given simultaneously, for example ceylon compile,doc,run com.redhat.hello,
• ceylon help command and ceylon --help now page output by default, and
• the ceylon command architecture now supports writing plugins in Ceylon.

IDE

Ceylon IDE now features the following improvements, along with many bugfixes and a number of performance enhancements:

• a brand new debugger for Ceylon,
• extensive support for new language features including constructors and native,
• improvements to the powerful Change Parameter List refactoring,
• the Inline refactoring can now inline a type alias,
• filtering of packages from searches and completions,
• many new quick fixes and assists,
• Paste Java as Ceylon,
• the popup Outline can now show inherited members,
• the redesigned Open Declaration dialog now shows documentation,
• keyboard shortcuts were added for certain quick assists,
• support for Eclipse's new dark theme,
• refactored preferences pages, with much greater customizability, including
• two new alternative syntax highlighting themes, along with an alternative icon set.

A number of important subsystems have been abstracted and rewritten in Ceylon, to support the ongoing development of the new IntelliJ-based IDE for Ceylon.

SDK

The platform modules, recompiled for 1.2.0, are available in the shared community repository, Ceylon Herd.

This release introduces two new platform modules:

• ceylon.transaction provides support for distributed transaction processing, and
• ceylon.regex provides regular expressions.

Along with several API enhancements and bugfixes, including:

• ceylon.time now has functions for parsing ISO 8601 formatted dates, times, and datetimes,
• ceylon.locale now supports formatting zoned times, and parsing dates and times,
• ceylon.interop.java now has javaClassFromDeclaration(),
• ceylon.net now has redirect(), and its Uri is now immutable, and
• the collection types in ceylon.collection now offer additional named constructors.

OpenShift cartridge

The Ceylon cartridge for OpenShift has been improved and updated to support Ceylon 1.2.

Web IDE

You can try Ceylon using the redesigned Web IDE, now rewritten in Ceylon, and featuring syntax highlighting, interactive error reporting, autocompletion, online documentation, and persistence and code sharing via Gist.

The Web IDE serves a dual purpose as a standard example demonstrating the use of Ceylon for web application development and deployment to the OpenShift cloud platform.

Community

The Ceylon community site, http://ceylon-lang.org, includes documentation, and information about getting involved.

Source code

The source code for Ceylon, its specification, and its website, is freely available from GitHub.

Information about Ceylon's open source licenses is available here.

Issues

Bugs and suggestions may be reported in GitHub's issue tracker.

Migrating from Ceylon 1.1

Migration from Ceylon 1.1 is easy. To recompile a module for 1.2:

• First ensure that its dependencies have also been recompiled.
• If it imports a Ceylon SDK platform module, upgrade the version number specified by the module import statement from "1.1.0" to "1.2.0" .
• If it imports any platform-native module, annotate its module declaration native("jvm") or native("js"), depending upon the target platform. This step does not apply to cross-platform modules.
• If, when recompiling, you encounter errors on assert statements, try removing the assertion (the improvements to flow typing now make some type assertions redundant).

Acknowledgement

As always, we're deeply grateful to the community volunteers who contributed a substantial part of the current Ceylon codebase, working in their own spare time. The following people have contributed to Ceylon:

Gavin King, Stéphane Épardaud, Tako Schotanus, Tom Bentley, David Festal, Enrique Zamudio, Bastien Jansen, Emmanuel Bernard, Aleš Justin, Tomáš Hradec, James Cobb, Ross Tate, Max Rydahl Andersen, Mladen Turk, Lucas Werkmeister, Roland Tepp, Diego Coronel, Matej Lazar, John Vasileff, Toby Crawley, Julien Viet, Loic Rouchon, Stephane Gallès, Ivo Kasiuk, Corbin Uselton, Paco Soberón, Michael Musgrove, Daniel Rochetti, Henning Burdack, Luke deGruchy, Rohit Mohan, Griffin DeJohn, Casey Dahlin, Alexander Altman, Alexander Zolotko, Alex Szczuczko, Andrés G. Aragoneses, Anh Nhan Nguyen, Brice Dutheil, Carlos Augusto Mar, Charles Gould, Chris Gregory, klinger, Martin Voelkle, Mr. Arkansas, Paŭlo Ebermann, Vorlent, Akber Choudhry, Renato Athaydes, Flavio Oliveri, Michael Brackx, Brent Douglas, Lukas Eder, Markus Rydh, Julien Ponge, Pete Muir, Nicolas Leroux, Brett Cannon, Geoffrey De Smet, Guillaume Lours, Gunnar Morling, Jeff Parsons, Jesse Sightler, Oleg Kulikov, Raimund Klein, Sergej Koščejev, Chris Marshall, Simon Thum, Maia Kozheva, Shelby, Aslak Knutsen, Fabien Meurisse, Sjur Bakka, Xavier Coulon, Ari Kast, Dan Allen, Deniz Türkoglu, F. Meurisse, Jean-Charles Roger, Johannes Lehmann, allentc, Nikolay Tsankov, Chris Horne, Gabriel Mirea, Georg Ragaller, Harald Wellmann, klinger, Oliver Gondža, Stephen Crawley.

Ten whole months in the making, this is the biggest release of Ceylon so far! Ceylon 1.1.0 incorporates oodles of enhancements and bugfixes, with well over 1400 issues closed.

Ceylon is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines. The language features a flexible and very readable syntax, a unique and uncommonly elegant static type system, a powerful module architecture, and excellent tooling, including an awesome Eclipse-based IDE.

Ceylon enables the development of cross-platform modules that execute portably in both virtual machine environments. Alternatively, a Ceylon module may target one or the other platform, in which case it may interoperate with native code written for that platform.

For the end user, the most significant improvements in Ceylon 1.1 are:

• performance enhancements, especially to compilation times in the IDE,
• even smoother interoperation with Java overloading and Java generics,
• out of the box support for deployment of Ceylon modules on OSGi containers,
• enhancements to the Ceylon SDK, including the new platform modules ceylon.promise, ceylon.locale, and ceylon.logging, along with many improvements to ceylon.language, ceylon.collection, and ceylon.test,
• many new features and improvements in Ceylon IDE, including
• ceylon.formatter, a high-quality code formatter written in Ceylon,
• support for command line tool plugins, including the new ceylon format and ceylon build plugins, and
• integration with vert.x.

A longer list of changes may be found here.

In the box

This release includes:

• a complete language specification that defines the syntax and semantics of Ceylon in language accessible to the professional developer,
• a command line toolset including compilers for Java and JavaScript, a documentation compiler, and support for executing modular programs on the JVM and Node.js,
• a powerful module architecture for code organization, dependency management, and module isolation at runtime,
• the language module, our minimal, cross-platform foundation of the Ceylon SDK, and
• a full-featured Eclipse-based integrated development environment.

Language

Ceylon is a highly understandable object-oriented language with static typing. The language features:

• an emphasis upon readability and a strong bias toward omission or elimination of potentially-harmful or potentially-ambiguous constructs and toward highly disciplined use of static types,
• an extremely powerful and uncommonly elegant type system combining subtype and parametric polymorphism with:
  • first-class union and intersection types,
  • both declaration-site and use-site variance, and
  • the use of principal types for local type inference and flow-sensitive typing,
• a unique treatment of function and tuple types, enabling powerful abstractions, along with the most elegant approach to null of any modern language,
• first-class constructs for defining modules and dependencies between modules,
• a very flexible syntax including comprehensions and support for expressing tree-like structures, and
• fully-reified generic types, on both the JVM and JavaScript virtual machines, and a unique typesafe metamodel.

More information about these language features may be found in the feature list and quick introduction.

This release introduces the following new language features:

• support for use-site variance, enabling complete interop with Java generics,
• dynamic interfaces, providing a typesafe way to interoperate with dynamically typed native JavaScript code,
• type inference for parameters of anonymous functions that occur in an argument list, and
• a Byte class that is optimized by the compiler.

Language module

The language module was a major focus of attention in this release, with substantial performance improvements, API optimizations, and new features, including the addition of a raft of powerful operations for working with streams.

The language module now includes an API for deploying Ceylon modules programmatically from Java.

The language module is now considered stable, and no further breaking changes to its API are contemplated.

Command line tools

The ceylon command now supports a plugin architecture. For example, type:

ceylon plugin install ceylon.formatter/1.1.0

To install the ceylon format subcommand.

IDE

This release of the IDE features dramatic improvements to build performance, and introduces many new features, including:

• a code formatter,
• seven new refactorings and many improvements to existing refactorings,
• many new quick fixes/assists,
• IntelliJ-style "chain completion" and completion of toplevel functions applying to a value,
• a rewritten Explorer view, with better presentation of modules and modular dependencies,
• synchronization of all keyboard accelerators with JDT equivalents,
• Quick Find References, Recently Edited Files, Format Block, Visualize Modular Dependencies, Open in Type Hierarchy View, Go to Refined Declaration, and much more.

SDK

The platform modules, recompiled for 1.1.0, are available in the shared community repository, Ceylon Herd.

This release introduces the following new platform modules:

• ceylon.promise, cross-platform support for promises,
• ceylon.locale, a cross-platform library for internationalization, and
• ceylon.logging, a simple logging API.

In addition, there were many improvements to ceylon.collection, which is now considered stable, and to ceylon.test.

The Ceylon SDK is available from Ceylon Herd, the community module repository.

Vert.x integration

mod-lang-ceylon implements Ceylon 1.1 support for Vert.x 2.1.x, and may be downloaded here.

Community

The Ceylon community site, http://ceylon-lang.org, includes documentation, and information about getting involved.

Source code

The source code for Ceylon, its specification, and its website is freely available from GitHub.

Issues

Bugs and suggestions may be reported in GitHub's issue tracker.

Acknowledgement

We're deeply indebted to the community volunteers who contributed a substantial part of the current Ceylon codebase, working in their own spare time. The following people have contributed to this release:

Gavin King, Stéphane Épardaud, Tako Schotanus, Emmanuel Bernard, Tom Bentley, Aleš Justin, David Festal, Max Rydahl Andersen, Mladen Turk, James Cobb, Tomáš Hradec, Ross Tate, Ivo Kasiuk, Enrique Zamudio, Roland Tepp, Diego Coronel, Daniel Rochetti, Loic Rouchon, Matej Lazar, Lucas Werkmeister, Akber Choudhry, Corbin Uselton, Julien Viet, Stephane Gallès, Paco Soberón, Renato Athaydes, Michael Musgrove, Flavio Oliveri, Michael Brackx, Brent Douglas, Lukas Eder, Markus Rydh, Julien Ponge, Pete Muir, Henning Burdack, Nicolas Leroux, Brett Cannon, Geoffrey De Smet, Guillaume Lours, Gunnar Morling, Jeff Parsons, Jesse Sightler, Oleg Kulikov, Raimund Klein, Sergej Koščejev, Chris Marshall, Simon Thum, Maia Kozheva, Shelby, Aslak Knutsen, Fabien Meurisse, Sjur Bakka, Xavier Coulon, Ari Kast, Dan Allen, Deniz Türkoglu, F. Meurisse, Jean-Charles Roger, Johannes Lehmann, Alexander Altman, allentc, Nikolay Tsankov, Chris Horne, gabriel-mirea, Georg Ragaller, Griffin DeJohn, Harald Wellmann, klinger, Luke, Oliver Gondža, Stephen Crawley.

Today, we're proud to announce the first production release of the Ceylon language specification, compiler, and IDE. Ceylon 1.0 is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines.

Ceylon enables the development of cross-platform modules that execute portably in both virtual machine environments. Alternatively, a Ceylon module may target one or the other platform, in which case it may interoperate with native code written for the platform.

In the box

This release includes:

• a complete formal language specification that defines the syntax and semantics of Ceylon in language accessible to the professional developer,
• a command line toolset including compilers for Java and JavaScript, a documentation compiler, and support for executing modular programs on the JVM and Node.js,
• a powerful module architecture for code organization, dependency management, and module isolation at runtime,
• the language module, our minimal, cross-platform foundation of the Ceylon SDK, and
• a full-featured Eclipse-based integrated development environment.

Language

Ceylon is a highly understandable object-oriented language with static typing. The language features:

• an emphasis upon readability and a strong bias toward omission or elimination of potentially-harmful constructs,
• an extremely powerful type system combining subtype and parametric polymorphism with declaration-site variance, including first-class union and intersection types, and using principal types for local type inference and flow-sensitive typing,
• a unique treatment of function and tuple types, enabling powerful abstractions,
• first-class constructs for defining modules and dependencies between modules,
• a very flexible syntax including comprehensions and support for expressing tree-like structures, and
• fully-reified generic types, on both the JVM and JavaScript virtual machines, and a unique typesafe metamodel.

More information about these language features may be found in the feature list and quick introduction.

This release does not introduce new language features. However, a very large number of bugs have been fixed.

IDE

Screenshots of the IDE may be seen here.

This release of the IDE introduces the following new features:

• a type hierarchy view, to complement the popup type hierarchy,
• a documentation view, to complement the documentation hover,
• a new Ceylon Module properties page, and the ability to manage dependencies from this page or from the New Ceylon Module wizard,
• enhancements to the search results view,
• improvements to syntax highlighting in the hover,
• a much improved wizard for importing Java archives into Ceylon module repositories, and
• many bugfixes.

Community module repository

Ceylon Herd is now open to the public.

SDK

The platform modules, recompiled for 1.0.0, are available in the shared community repository, Ceylon Herd.

This release introduces the following new platform modules:

• ceylon.build, a framework for writing build scripts in Ceylon, and
• ceylon.html, a library for defining HTML content in Ceylon.

Community

The Ceylon community site, http://ceylon-lang.org, includes documentation, and information about getting involved.

Source code

The source code for Ceylon, its specification, and its website is freely available from GitHub.

Issues

Bugs and suggestions may be reported in GitHub's issue tracker.

Acknowledgement

We're deeply indebted to the community volunteers who contributed a substantial part of the current Ceylon codebase, working in their own spare time. The following people have contributed to this release:

Gavin King, Stéphane Épardaud, Tako Schotanus, Emmanuel Bernard, Tom Bentley, Aleš Justin, David Festal, Flavio Oliveri, Max Rydahl Andersen, Mladen Turk, James Cobb, Tomáš Hradec, Michael Brackx, Ross Tate, Ivo Kasiuk, Enrique Zamudio, Roland Tepp, Diego Coronel, Daniel Rochetti, Loic Rouchon, Matej Lazar, Corbin Uselton, Akber Choudhry, Lucas Werkmeister, Julien Viet, Brent Douglas, Lukas Eder, Markus Rydh, Julien Ponge, Pete Muir, Henning Burdack, Nicolas Leroux, Brett Cannon, Geoffrey De Smet, Guillaume Lours, Gunnar Morling, Jeff Parsons, Jesse Sightler, Oleg Kulikov, Raimund Klein, Sergej Koščejev, Chris Marshall, Simon Thum, Maia Kozheva, Shelby, Aslak Knutsen, Fabien Meurisse, Paco Soberón, Sjur Bakka, Xavier Coulon, Ari Kast, Dan Allen, Deniz Türkoglu, F. Meurisse, Jean-Charles Roger, Johannes Lehmann, Nikolay Tsankov.