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14 lines
930 B
Markdown
14 lines
930 B
Markdown
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title: Program Structure Interface (PSI)
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---
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<!-- Copyright 2000-2020 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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The Program Structure Interface, commonly referred to as just PSI, is the layer in the _IntelliJ Platform_ that is responsible for parsing files and creating the syntactic and semantic code model that powers so many of the platform's features.
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* [PSI Files](/basics/architectural_overview/psi_files.md)
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* [File View Providers](/basics/architectural_overview/file_view_providers.md)
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* [PSI Elements](/basics/architectural_overview/psi_elements.md)
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> **TIP** A very helpful tool for debugging the PSI implementation is the [PsiViewer plugin](https://plugins.jetbrains.com/plugin/227-psiviewer).
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It can show you the structure of the PSI tree, the properties of every PSI element and highlight its text range.
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