WRITING A PLUGIN FOR @ALEXEYBUZDIN, SEPTEMBER 2017 

@ALEXEYBUZDIN WRITING MOBILE AND JAVA STUFF ORGANIZING EVENTS SPEAKING AT CONFERENCES 

WRITING A PLUGIN FOR @ALEXEYBUZDIN, SEPTEMBER 2017 

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PLUGINS.JETBRAINS.COM 

> .gitignore plugin > Markdown support > CheckStyle-IDEA > Lombok Plugin > BashSupport > etc 

DEMO LET’S START WITH A PROJECT! 

RECAP: PLUGIN PROJECT IS A JAVA PROJECT WITH PLUGIN.XML AND TARGET SDK - INTELLIJ PRODUCT http://www.jetbrains.org/intellij/sdk/docs/tutorials/customlanguagesupport_tutorial.html 

PLUGIN.XML == ANDROIDMANIFEST.XML 

TIP: USE GRADLE WITH “ORG.JETBRAINS.INTELLIJ" PLUGIN HTTPS://SL.GDG.LV/SAMPLEINTELLIJPLUGIN 

BUILDING A PLUGIN INCREMENTALY 

BUILDING A PLUGIN INCREMENTALY BUT FOR WHAT? 

Project Goal: www.fusetools.com https://github.com/AlexeyBuzdin/Fuse.IntelliJPlugin 

DEMO LET’S START WITH AN ACTION! 

WHAT DID WE ACHIEVE? 1. We’ve written an Action 2. Created our own Language 3. Registered a new File Type 4. Added an Icon ☺ 

MORE ON ACTION: GROUPING ACTIONS 

MORE ON ACTION: DEFAULTACTIONGROUP public class CustomDefaultActionGroup extends DefaultActionGroup { @Override public void update(AnActionEvent event) { Editor editor = event.getData(CommonDataKeys.EDITOR); event.getPresentation().setVisible(true); event.getPresentation().setEnabled(editor != null); event.getPresentation().setIcon(AllIcons.General.Error); } } 

LET’S FIX THIS! Name: Comments: 

LET’S FIX THIS! Name: Comments: 

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PARSER AND LEXER LEXER - PARSES CODE INTO TOKENS PARSER - VALIDATES CODE STRUCTURE 

BACKUS–NAUR FORM > ::= __expression__ > ::= | > ::= 

BACKUS–NAUR FORM FOR CSV ::= * 

BACKUS–NAUR FORM FOR CSV ::= * ::= ? | (“,”)+ “,”? 

BACKUS–NAUR FORM FOR CSV ::= * ::= ? | (“,”)+ “,”? ::= [^,]+ 

Grammar-Kit root_rule ::= rule_A rule_B rule_C rule_D // a sequence rule_A ::= token | 'or_text' | "another_one" // a choice rule_B ::= [ optional_token ] and_another_one? // optional parts rule_C ::= &required !forbidden // predicates rule_D ::= { can_use_braces + (and_parens) * } // grouping and repetition // Grammar-Kit extensions: private left rule_with_modifier ::= '+' // rule modifiers left rule_with_attributes ::= '?' {elementType=rule_D} // left rule and attributes private meta list_macro ::= <

> (',' <

>) * // meta rule private list_usage ::= <> // external expression https://github.com/JetBrains/Grammar-Kit 

DEMO LET’S DESCRIBE A LANGUAGE! 

JFlex - Lexical Analyzer Generator http://jflex.de/manual.html 

package com.simpleplugin; import com.intellij.lexer.FlexLexer; import com.intellij.psi.tree.IElementType; import com.simpleplugin.psi.SimpleTypes; import com.intellij.psi.TokenType; %% %class SimpleLexer %implements FlexLexer %unicode %function advance %type IElementType %eof{ return; %eof} CRLF=\R WHITE_SPACE=[\ \n\t\f] FIRST_VALUE_CHARACTER=[^ \n\f\\] | "\\"{CRLF} | "\\". VALUE_CHARACTER=[^\n\f\\] | "\\"{CRLF} | "\\". END_OF_LINE_COMMENT=("#"|"!")[^\r\n]* SEPARATOR=[:=] KEY_CHARACTER=[^:=\ \n\t\f\\] | "\\ " 

PROPERTY: KEY = VALUE %state WAITING_VALUE %% {END_OF_LINE_COMMENT} { yybegin(YYINITIAL); return SimpleTypes.COMMENT; } {KEY_CHARACTER}+ { yybegin(YYINITIAL); return SimpleTypes.KEY; } {SEPARATOR} { yybegin(WAITING_VALUE); return SimpleTypes.SEPARATOR; } {CRLF}({CRLF}|{WHITE_SPACE})+ { yybegin(YYINITIAL); return TokenType.WHITE_SPACE; } {WHITE_SPACE}+ { yybegin(WAITING_VALUE); return TokenType.WHITE_SPACE; } {FIRST_VALUE_CHARACTER}{VALUE_CHARACTER}* { yybegin(YYINITIAL); return SimpleTypes.VALUE; } ({CRLF}|{WHITE_SPACE})+ { yybegin(YYINITIAL); return TokenType.WHITE_SPACE; } . { return TokenType.BAD_CHARACTER; } 

DEMO NEXT STEP IS LEXER! 

WHAT DID WE ACHIEVE? 1. We’ve described a Parser 2. Implemented a Lexer 3. Added some ! NEXT STEPS? 

COLORSETTINGSPAGE 

PROJECT WIZARD Full javax.swing.* support 

RUN CONFIGURATIONS Gather state from JPanel and triggers on startProcess() 

WHAT CAN YOU DO WITH PSIELEMENT 1. References and GoTo 2. Find Usage 3. Code Completion 4. Annotators 5. Line Marker 6. More 

TIPS PREVENTING UI FREEZES ALWAYS CHECK FOR NEGATIVE CASE IMPROVE THE BNF 

GREAT EXAMPLES > jetbrains-plugin-graph-database > intellij-erlang > intellij-rust 

THANK YOU! Q&A FOLLOW ME ON TWITTER @ALEXEYBUZDIN