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topics/reference_guide/custom_language_support/language_injection.md
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# Language Injection
<!-- Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. --> <!-- Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
# Language Injection
<link-summary>Injecting a language into different language elements.</link-summary> <link-summary>Injecting a language into different language elements.</link-summary>
<tldr> <tldr>
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However, custom language authors need to implement the `org.intellij.intelliLang.languageSupport` EP to make their language and PSI element patterns known to IntelliLang. However, custom language authors need to implement the `org.intellij.intelliLang.languageSupport` EP to make their language and PSI element patterns known to IntelliLang.
Therefore, plugin authors who want to provide injections for existing languages can skip the first step. Therefore, plugin authors who want to provide injections for existing languages can skip the first step.
#### Implement org.intellij.intelliLang.languageSupport EP #### Implement `org.intellij.intelliLang.languageSupport` EP
Implement the `org.intellij.intelliLang.languageSupport` EP and use Implement the `org.intellij.intelliLang.languageSupport` EP and use
[`AbstractLanguageInjectionSupport`](%gh-ic%/plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/AbstractLanguageInjectionSupport.java) as a base class. [`AbstractLanguageInjectionSupport`](%gh-ic%/plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/AbstractLanguageInjectionSupport.java) as a base class.
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config-file="myLanguageID-injections.xml">org.intellij.intelliLang</depends> config-file="myLanguageID-injections.xml">org.intellij.intelliLang</depends>
```` ````
## LanguageInjectionContributor and LanguageInjectionPerformer ## `LanguageInjectionContributor` and `LanguageInjectionPerformer`
The `com.intellij.languageInjectionContributor` EP provides injection information for the given context in terms of _what_ to inject. The `com.intellij.languageInjectionContributor` EP provides injection information for the given context in terms of _what_ to inject.
As a plugin author, implement [`LanguageInjectionContributor`](%gh-ic%/platform/core-api/src/com/intellij/lang/injection/general/LanguageInjectionContributor.java) to provide context-specific injections. As a plugin author, implement [`LanguageInjectionContributor`](%gh-ic%/platform/core-api/src/com/intellij/lang/injection/general/LanguageInjectionContributor.java) to provide context-specific injections.
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> >
{style="note"} {style="note"}
## MultiHostInjector ## `MultiHostInjector`
[`MultiHostInjector`](%gh-ic%/platform/core-api/src/com/intellij/lang/injection/MultiHostInjector.java) registered in `com.intellij.multiHostInjector` EP is a very low-level API, but it gives plugin authors the most freedom. [`MultiHostInjector`](%gh-ic%/platform/core-api/src/com/intellij/lang/injection/MultiHostInjector.java) registered in `com.intellij.multiHostInjector` EP is a very low-level API, but it gives plugin authors the most freedom.
It performs language injection inside other PSI elements, e.g. inject SQL inside an XML tag text or inject regular expressions into Java string literals. It performs language injection inside other PSI elements, e.g. inject SQL inside an XML tag text or inject regular expressions into Java string literals.