Additional Minor Features
A number of minor features are listed in the following format:
fully.qualified.extensionPointName - Extension Point Name (must be specified in plugin.xml)
com.extensionPoint.class description text - Extension Point class/interface to provide functionality
- Sample 1 - Sample implementation
PairedBraceMatcher Returns an array of brace pairs (
BracePair) specifying the characters for the opening and closing braces and the lexer token types for these characters. (In principle, it is possible to return multi-character tokens, like "begin" and "end", as the start and end tokens of a brace pair. The IDE will match such braces, but the highlighting for such braces will not be entirely correct.)
Certain types of braces can be marked as structural. Structural braces have higher priority than regular braces: they are matched with each other even if there are unmatched braces of different types between them. An opening non-structural brace is not matched with a closing one if one of them is inside a pair of matched structural braces and another is outside. See also Recognizing Complex Multi-Block Expressions.
2022.3 If the brace matching is "too heavy" and should not be executed in EDT, implement
HeavyBraceHighlighter and register in
FoldingBuilder returns the list of foldable text ranges (as an array of
FoldingDescriptor objects), the replacement text which is shown for each range when it is folded, and the default state of each folding region (folded or unfolded).
JoinLinesHandlerDelegate allows extending support smart/semantic (e.g., String literal split on multiple lines).
SmartEnterProcessor handles (e.g., autocomplete missing semicolon/parentheses).
Move Element Left/Right
NameSuggestionProvider provides name suggestions for the given element, e.g., for Rename refactoring.
Semantic Highlight Usages
HighlightUsagesHandlerFactory allows highlighting e.g., Exit Points or Exceptions.
ParserDefinition.getCommentTokens() must return the set of tokens treated as comments to populate the TODO window.
Moved to Spell Checking.
ReferenceInjector allows users to inject pre-defined references (e.g., "Encoding", "File Reference") into
PsiLanguageInjectionHost elements (IntelliLang plugin required).
ElementColorProvider renders gutter icon for an element containing color information.
Recognizing Complex Multi-Block Expressions
CodeBlockSupportHandler allows providing text ranges for more complex code blocks like, e.g., in
else blocks. It is used to highlight markers and keywords if one is under the cursor, and for navigation to the beginning/end of blocks. See also Brace Matching.
Plain Text Completion
PlainTextSymbolCompletionContributor provides a simple way to extract lookup elements from a file so that users have completion available in, e.g., plain text editors like VCS commit messages.
Splitting and Joining List Constructs
ListSplitJoinContext needs to be implemented to define the exact behavior of splitting and joining list-like constructs in a language. The UI will show implementations of this EP as an intention action at appropriate locations. Developers can use the abstract classes in
DefaultListSplitJoinContext for their implementation and
XmlAttributesSplitJoinContext serves as a good example.
Suggesting Rename and Change Signature Refactorings
SuggestedRefactoringSupport provides functionality for suggesting rename and change signature refactorings for custom languages. Please see
KotlinSuggestedRefactoringSupport for an implementation example.
Background Colors for Editors and Project View
EditorTabColorProvider allows for the modification of the background colors for specific files.
Custom Names and Tooltips for Editor Tabs
EditorTabTitleProvider allows for specifying custom names and tooltips displayed in the title of editor tabs. Please see, e.g.,
GradleEditorTabTitleProvider which shows how the project name is added to the editor tab for Gradle files.
Prevent Error Highlighting of Files
ProblemHighlightFilter and the
com.intellij.problemFileHighlightFilter EP (which implements
Condition<VirtualFile>) are used to filter out files that should not be error-highlighted because they are, e.g., outside the current project scope. Note that these filters should be permissive and only prevent highlighting for files that are absolutely known to be outside the scope.
Provide Fully Qualified Names (FQN) for Elements
QualifiedNameProvider provides features like copying and pasting references of FQN for, e.g., classes, functions, or methods. Therefore, the
QualifiedNameProvider implementation needs to provide logic to convert from and to FQN.
Label Files as Test Files
TestSourcesFilter allows for telling the IDE that a file is a test file, even it's not located in a directory marked as test root. This can be used in situations where test files are located next to source files. If these files can be distinguished either by filename or content from source files, implementing this EP will mark them as test files for the IDE.
Move Statements Up and Down in the Editor
StatementUpDownMover allows for customizing the behavior of moving statements up and down. This can be used to keep code syntactically correct when moving code in the editor, e.g. when moving a variable declaration.