# sequenceplugin **Repository Path**: tim2923/sequenceplugin ## Basic Information - **Project Name**: sequenceplugin - **Description**: No description available - **Primary Language**: Java - **License**: AGPL-3.0 - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2026-04-03 - **Last Updated**: 2026-04-03 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README [![GitHub release](https://img.shields.io/github/v/release/Vanco/SequencePlugin)](https://github.com/Vanco/SequencePlugin/releases) # SequenceDiagram Sequence Diagram is tool to generate simple sequence diagram(UML) from java, kotlin, scala(Beta) and groovy(limited) code. https://vanco.github.io/SequencePlugin. with this plugin, you can + generate Simple Sequence Diagram. + Navigate the code by click the diagram shape. + Delete Class from diagram. + Export the diagram as image(SVG, JPEG, PNG, TIFF). + Export the diagram as PlantUML, Mermaid format file. + Exclude classes from diagram by Settings > Tools > Sequence Diagram + Smart Interface(experimental) + Lambda Expression(experimental) + Kotlin Support(Experimental) + Scala support(Experimental, Beta) + Groovy Support(Experimental, limited) ## Experimental features **The experimental features created by myself, which is not part of UML standard. Use this feature in your own risk.** ### UAST support (since version 3.x) SequenceDiagram version 3.x will use UAST api to generate sequence diagram. Refer to ['The UAST description from IntelliJ Platform SDK'](https://plugins.jetbrains.com/docs/intellij/uast.html) > UAST (Unified Abstract Syntax Tree) is an abstraction layer on the PSI of different programming languages targeting the > JVM (Java Virtual Machine). It provides a unified API for working with common language elements like classes and method > declarations, literal values, and control flow operators. > > Which languages are supported? > - Java: full support > - Kotlin: full support > - Scala: beta, but full support > - Groovy: declarations only, method bodies not supported > **Note** : There are some limitation when generate from scala or groovy code. Refer to the list of [known issues](#known-issue). ### Smart Interface Find the implementation of the interface smartly. e.g. ```java public interface Fruit { int eat(); } public class Apple implements Fruit { @Override public int eat() { return 5; } } ``` `Apple` implemented the `Fruit` interface. When we generate sequence diagram for the `eatFruit` method: ```java public class People { private Fruit fruit = new Apple(); public void eatFruit() { fruit.eat(); } } ``` I draw dummy `implementation call` in dash line. ![Smart Interface](imges/smart_interface.png) For the interface or abstract class, if there is only one implementation found, it will draw in diagram automatically. More than one implementation, you need to choose one to draw. this is an option in settings. ### Lambda Expression No standard for the lambda expression in the sequence diagram yet. So I create mine. e.g. ```java public interface Service { String invoke(Int a); } ``` I need draw the sequence diagram for `hello` method: ```java public class Lambda { public Service hello() { return a -> { Fruit fruit = new Apple(); fruit.eat(); return "I'm good!"; }; } } ``` I draw a dummy `() ->` self call in diagram. ![Lambda Expression](imges/lambda_expr.png) ## How to use Sequence Diagram can generate sequence diagram from JAVA, Kotlin, Scala, Groovy File. 1. Open Java/Kotlin/Scala/Groovy file 2. Generate SequenceDiagram with shortcut `Alt S` for windows, `Option S` for macOS Please try to experience it and find what happen. Have fun! ## Version History Current Version ### Version and API comparison | Open API | v2.x.x | v3.x | |-------------------|-------------------------------------------------|---------------------------| | IGenerator | SequenceGenerator
KtSequenceGenerator | UastSequenceGenerator | | GeneratorFactory | JavaGeneratorFactory
KtGeneratorFactory | UastGeneratorFactory | | ElementTypeFinder | JavaElementTypeFinder
KtElementTypeFinder | | | ActionFinder | JavaActionFinder
KtActionFinder | UastActionFinder | | SequenceNavigable | JavaSequenceNavigable
KtSequenceNavigable | JavaSequenceNavigable[^1] | [^1]: `JavaSequenceNavigable` work for Java, Kotlin, Scala, Groovy ### Function comparison | | v2.x.x | 3.x | |--------------------------------------------------------|----------------------------|------------------| | **Language:** | | | | Java | ✓ | ✓ | | Kotlin | ✓ Partial | ✓ | | Scala | | ✓ | | Groovy | | ✓ Partial | | **Entry:** | | | | Navigation Bar | ✓ | | | Tools Menu | ✓ | ✓ | | Editor Context Menu | ✓ | ✓ | | Shortcut `Alt S` for windows
`Option S` for macOS | | ✓ | | Project view popup menu | | | | Structure view popup menu | | | | **Feature:** | | | | Smart Interface[^2] | ✓ EXC: 2.2.4, 2.2.5 | ✓ | | Smart Interface configuration | | ✓ | | Lambda call configuration | ✓ | ✓ | [^2]: `Smart interface` will scan entire file and spend more generate time. ### versions history: [Changelog](CHANGELOG.md) ## Known issue #### 1. Scala for comprehension calls is not supported For example: ```scala class B() { def bar() = Option("bar") } class A(b: B) { def foo() = { val r = "foo" + b.bar().getOrElse("?") r } def foo2() = { val r = for { x <- b.bar() } yield "foo" + x r.getOrElse("?") } } ``` the for comprehension call ```scala val r = for { x <- b.bar() } yield "foo" + x ``` it's UAST tree is `UastEmptyexpression`. ``` UMethod (name = foo2) UBlockExpression UDeclarationsExpression ULocalVariable (name = r) UastEmptyExpression(type = PsiType:Option) UReturnExpression UQualifiedReferenceExpression USimpleNameReferenceExpression (identifier = r) UMethodCall(name = getOrElse) UIdentifier (Identifier (getOrElse)) ULiteralExpression (value = "?") ``` so the `b.bar()` method call will not generate base on `UastEmptyexpression`. Hopefully, the UAST api will solve this problem sooner. #### 2. Groovy method body is not supported For example: ```groovy /** * A Class description */ class Student { /** the name of the person */ String name /** * Creates a greeting method for a certain person. * * @param otherPerson the person to greet * @return a greeting message */ //known issue: groovy method will not generate in UAST String greet(String otherPerson) { "Hello ${otherPerson}" // call java Fruit fruit = new Banana() fruit.eat() } } ``` Based on UAST api limitation, it's UAST tree is no method body mappings. ``` UFile (package = van.demo.grovvy) UClass (name = Student) UMethod (name = greet) UParameter (name = otherPerson) ``` When generate sequence of method `greet`, the calls in the method body will not generate (the call java code in the body of `greet`). ```groovy "Hello ${otherPerson}" // call java Fruit fruit = new Banana() fruit.eat() ``` ## Acknowledgement #### Name history + **SequencePlugin** Maintained by Kentaur(Kesh Sibilev, ksibilve@yahoo.com) until 2011 + **SequencePluginReload** Maintained by Vanhg(Evan Fan, fanhuagang@gmail.com) 2011 - 2015 + **SequenceDiagram** Maintained by Vanco(Evan Fan, fanhuagang@gmail.com) since 2016 ![new](imges/new.svg){:height="32px" width="32px"} #### Why change name? Since 2011, I found a solution of NPE of original **SequencePlugin**, so I write email to Kentaur with my solution, He said he was not coding anymore. Instead, he sent me the code. I fix the NPE issue and publish to plugin repository with new name **SequencePluginReload**. In 2015, the IntelliJ change the login system, and I lost my account, cannot continue to publish new version to the repository. In 2016, I change the Name again to **SequenceDiagram** and host the source code on [github](https://github.com/Vanco/SequencePlugin). Now it is open source. Thanks Kentaur for the great work on the original source. ---