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<!-- Copyright 2000-2021 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
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Custom languages provide code completion using one of two approaches: Contributor and Reference-based (see [10. Reference Contributor](reference_contributor.md)) completion.
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Custom languages provide code completion using one of two approaches: Contributor and Reference-based (see [](reference_contributor.md)) completion.
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**Reference**: [Code Completion](code_completion.md)
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**Reference**: [](code_completion.md)
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## Define a Completion Contributor
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For this tutorial, the `simple_language_plugin` provides custom completion for values in Simple Language property files.
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@ -32,4 +32,4 @@ Open the [`test.simple`](lexer_and_parser_definition.md#run-the-project) file.
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Erase the property "English" and invoke [Basic Code Completion](https://www.jetbrains.com/help/idea/auto-completing-code.html#invoke-basic-completion).
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The choice "Hello" is shown:
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@ -7,12 +7,12 @@ helps users by showing documentation for symbols like method calls inside the ed
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For the custom language tutorial, we’re implementing a version of this EP for the Simple Language that shows the key/value,
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the file where it is defined, and any related documentation comment.
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**Reference:** [Documentation](documentation.md)
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**Reference:** [](documentation.md)
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## Implement DocumentationProvider and Register the EP
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In the first step, we create an empty class that extends
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In the first step, we create an empty class that extends
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[`AbstractDocumentationProvider`](upsource:///platform/analysis-api/src/com/intellij/lang/documentation/AbstractDocumentationProvider.java)
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and registers it in the <path>plugin.xml</path>.
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@ -36,7 +36,7 @@ Make sure the class is registered in the <path>plugin.xml</path> between the `ex
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For the Simple Language, we consider two use-cases:
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1. A Simple key is [used inside a Java string literal](reference_contributor.md),
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1. A Simple key is [used inside a Java string literal](reference_contributor.md),
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and we would like to show documentation for the key/value right from the reference inside the Java file.
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2. The cursor is already over a key/value definition inside a Simple file, in which case we would also like to show its documentation.
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@ -194,7 +194,7 @@ In other circumstances, you can override `getDocumentationElementForLookupItem()
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To be able to call <menupath>View | Quick Documentation</menupath> for Simple properties in all places of a Java string literal, two steps are required:
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1. The extension point needs to be changed from `lang.documentationProvider` to `documentationProvider` because only then
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1. The extension point needs to be changed from `lang.documentationProvider` to `documentationProvider` because only then
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the Simple DocumentationProvider is called for PSI elements with a different language.
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2. The `getCustomDocumentationElement()` method needs to be implemented to find the correct target PSI element for creating the documentation.
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@ -5,7 +5,7 @@
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A `FindUsagesProvider` uses a word scanner to build an index of words in every file.
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A scanner breaks the text into words and defines the context for each word.
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**Reference**: [Find Usages](find_usages.md)
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**Reference**: [](find_usages.md)
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## Define a Find Usages Provider
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The `SimpleFindUsagesProvider` implements [`FindUsagesProvider`](upsource:///platform/indexing-api/src/com/intellij/lang/findUsages/FindUsagesProvider.java).
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@ -31,4 +31,4 @@ Run the plugin by using the Gradle [runIde task](gradle_prerequisites.md#running
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The IDE now supports [Find Usages](https://www.jetbrains.com/help/idea/find-highlight-usages.html) for any property with a reference:
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@ -6,7 +6,7 @@ The IntelliJ Platform includes a powerful framework for implementing formatting
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A formatter enables reformatting code automatically based on code style settings.
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The formatter controls spaces, indents, wrap, and alignment.
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**Reference**: [Code Formatter](code_formatting.md)
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**Reference**: [](code_formatting.md)
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## Define a Block
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The formatting model represents the formatting structure of a file as a tree of [`Block`](upsource:///platform/code-style-api/src/com/intellij/formatting/Block.java) objects, with associated indent, wrap, alignment and spacing settings.
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@ -45,4 +45,4 @@ Open the example Simple Language [properties file ](lexer_and_parser_definition.
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Add some extra spaces around the `=` separator between `language` and `English`.
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Reformat the code by selecting **Code \| Show Reformat File Dialog** and choose **Run**.
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@ -4,7 +4,7 @@
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A _Go to Symbol Contributor_ helps the user to navigate to any PSI element by its name.
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**Reference**: [Go to Class and Go to Symbol](go_to_class_and_go_to_symbol.md)
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**Reference**: [](go_to_class_and_go_to_symbol.md)
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## Define a Helper Method for Generated PSI Elements
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To specify how a PSI element looks like in the <menupath>Navigate | Symbol</menupath> popup window, <control>Structure</control> tool window, or other components, it should implement `getPresentation()`.
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@ -50,4 +50,4 @@ Run the plugin by using the Gradle [runIde task](gradle_prerequisites.md#running
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The IDE now supports navigating to a property definition by name pattern via <menupath>Navigate | Symbol</menupath> action.
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{width="800"}
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{width="800"}
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In order for the IntelliJ Platform to parse a Simple Language file, tokens and elements must be defined based on [`IElementType`](upsource:///platform/core-api/src/com/intellij/psi/tree/IElementType.java).
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The Simple Language grammar must also be defined to generate a parser.
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**Reference**: [Implementing a Parser and PSI](implementing_parser_and_psi.md)
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**Reference**: [](implementing_parser_and_psi.md)
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## Define a Token Type
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Create `SimpleTokenType` in the `org.intellij.sdk.language.psi` package (see the `simple_language_plugin` code sample) by subclassing `IElementType`.
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@ -66,4 +66,4 @@ Mark this folder as *Generated Sources Root* and make sure everything compiles w
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>
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{type="tip"}
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{width="800"}
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{width="800"}
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@ -6,7 +6,7 @@ The IntelliJ Platform determines file type by examining the name of a file.
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Each language has [Language](upsource:///platform/core-api/src/com/intellij/lang/Language.java) and [LanguageFileType](upsource:///platform/core-api/src/com/intellij/openapi/fileTypes/LanguageFileType.java) objects defining the language.
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Register the `LanguageFileType` with the IntelliJ Platform in the plugin configuration file.
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**Reference**: [Registering a File Type](registering_file_type.md)
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**Reference**: [](registering_file_type.md)
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## Define the Language
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The language implemented in this tutorial is named "Simple" - note the case of the name.
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The lexical analyzer defines how the contents of a file are broken into tokens, which is the basis for supporting custom language features.
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The easiest way to create a lexer is to use [JFlex](https://jflex.de/).
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**Reference**: [Implementing Lexer](implementing_lexer.md)
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**Reference**: [](implementing_lexer.md)
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## Required Project Configuration Change
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The previous tutorial step [Grammar and Parser](grammar_and_parser.md), and this page, generate source files in the directory `src/main/gen`.
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@ -20,7 +20,7 @@ Or the following line in the project's `build.gradle.kts` file:
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sourceSets["main"].java.srcDirs("src/main/gen")
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```
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Reload the Gradle project for changes to take effect.
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Reload the Gradle project for changes to take effect.
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## Define a Lexer
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Define a `Simple.flex` file with rules for the Simple Language lexer, as demonstrated in `org.intellij.sdk.language.Simple.flex`.
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@ -101,4 +101,4 @@ tab : \u0009
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Now open the *PsiViewer* tool window and check how the lexer breaks the content of the file into tokens, and the parser parsed the tokens into PSI elements.
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A quick fix for a custom language supports the IntelliJ Platform-based IDE feature [Intention Actions](https://www.jetbrains.com/help/idea/intention-actions.html#apply-intention-actions).
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For the Simple Language, this tutorial adds a quick fix that helps to define an unresolved property from its usage.
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**Reference**: [Code Inspections and Intentions](code_inspections_and_intentions.md)
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**Reference**: [](code_inspections_and_intentions.md)
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## Update the Element Factory
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The `SimpleElementFactory` is updated to include two new methods to support the user choice of creating a new property for the Simple Language quick fix.
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>
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{type="note"}
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**Reference**: [References and Resolve](references_and_resolve.md), [PSI References](psi_references.md)
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**Reference**: [](references_and_resolve.md), [](psi_references.md)
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## Define a Named Element Class
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The classes below show how the Simple Language fulfills the need to implement `PsiNamedElement`.
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@ -162,4 +162,4 @@ Run the project by using the Gradle [runIde task](gradle_prerequisites.md#runnin
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The IDE now supports [refactoring](https://www.jetbrains.com/help/idea/rename-refactorings.html) suggestions:
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{width="800"}
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{width="800"}
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The structure view can be customized for a specific file type.
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Creating a structure view factory allows showing the structure of any file in a _Structure_ Tool Window for easy navigation between items in the current editor.
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**Reference**: [Structure View](structure_view.md)
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**Reference**: [](structure_view.md)
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## Define a Structure View Factory
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The structure view factory implements [`PsiStructureViewFactory`](upsource:///platform/editor-ui-api/src/com/intellij/lang/PsiStructureViewFactory.java).
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@ -49,4 +49,4 @@ Run the project by using the Gradle [runIde task](gradle_prerequisites.md#runnin
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Open the `test.simple` file and choose **View \| Tool Windows \| Structure**.
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The IDE now supports a structure view of the Simple Language:
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A plugin can also define color settings based on `ColorSettingPage` so the user can configure highlight colors.
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The `SimpleSyntaxHighlighter`, `SimpleSyntaxHighlighterFactory`, and `SimpleColorSettingsPage` discussed on this page are demonstrated in the `simple_language_plugin` code sample.
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**Reference**: [Syntax Highlighting and Error Highlighting](syntax_highlighting_and_error_highlighting.md)
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**Reference**: [](syntax_highlighting_and_error_highlighting.md)
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## Define a Syntax Highlighter
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The Simple Language syntax highlighter class extends [`SyntaxHighlighterBase`](upsource:///platform/editor-ui-api/src/com/intellij/openapi/fileTypes/SyntaxHighlighterBase.java).
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@ -64,4 +64,4 @@ Run the project by using the Gradle [runIde task](gradle_prerequisites.md#runnin
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In the IDE Development Instance, open the Simple Language highlight settings page: <menupath>Settings/Preferences | Editor | Color Scheme | Simple</menupath>.
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Each color initially inherits from a <control>Language Defaults</control> value.
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