A file view provider (FileViewProvider) manages access to multiple PSI trees within a single file.
For example, a JSPX page has a separate PSI tree for the Java code in it (PsiJavaFile), a separate tree for the XML code (XmlFile), and a separate tree for JSP as a whole (JspFile).
Each of the PSI trees covers the entire contents of the file and contains special "outer language elements" in the places where contents in a different language can be found.
A FileViewProvider instance corresponds to a single VirtualFile, a single Document, and can retrieve multiple PsiFile instances.
FileViewProvider? What can I do with a FileViewProvider?
To get the set of all languages for which PSI trees exist in a file: fileViewProvider.getLanguages()
To get the PSI tree for a particular language: fileViewProvider.getPsi(language). For example, to get the PSI tree for XML, use fileViewProvider.getPsi(XMLLanguage.INSTANCE).
To find an element of a particular language at the specified offset in the file: fileViewProvider.findElementAt(offset, language)
FileViewProvider?
To create a file type that has multiple interspersing trees for different languages, a plugin must contain an extension to the com.intellij.fileType.fileViewProviderFactory extension point.
Implement FileViewProviderFactory and return your FileViewProvider implementation from createFileViewProvider() method.
Register as follows in plugin.xml:
<extensions defaultExtensionNs="com.intellij"> <fileType.fileViewProviderFactory filetype="$FILE_TYPE$" implementationClass="com.example.MyFileViewProviderFactory"/> </extensions>
Where $FILE_TYPE$ refers to the type of the file being created (for example, "JSF").
19 March 2025
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