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  • IntelliJ IDEA Architectural Overview

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To access a PSI tree within a PSI file, use File View Provider :
psiFile.getViewProvider().getPsi(language)
where the language parameter specifies the programming language and takes values of the Language type defined in StdLanguages class. For example, to get the PSI tree for XML, use psiFile.getViewProvider().getPsi(StdLanguages.XML).

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Most interesting modification operations are performed on the level of individual PSI elements, not files as a whole.

  • To iterate over the elements in a PSI tree, use psiFile.accept(new PsiRecursiveElementVisitor()...)

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  • To find a PSI element of a particular language at the specified offset in the PSI file, use psiFile.getViewProvider().findElementAt(offset,language)
  • To get child elements of a PSE tree in a particular language, use psiFile.getViewProvider().getPsi(language).getChildren()
  • To get child elements of a PSI element, use psiElement.getChildren()

to be continued