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Textmate for linux code#
VS Code uses TextMate grammars as the syntax tokenization engine. Semantic tokenization and theming are explained in the Semantic Highlighting Guide. This article focuses on the TextMate-based tokenization. And as language servers can take a while to load and analyze a project, semantic token highlighting may appear after a short delay. Semantic highlighting goes on top of the syntax highlighting. Highlighting based on semantic tokens is considered an addition to the TextMate-based syntax highlighting.
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For example, a constant variable name can be rendered using constant highlighting throughout the project, not just at the place of its declaration. Semantic providers are typically implemented by language servers that have a deeper understanding of the source file and can resolve symbols in the context of the project. Starting with release 1.43, VS Code also allows extensions to provide tokenization through a Semantic Token Provider. Tokens are used for syntax highlighting, but also to classify the source code into areas of comments, strings, regex. The TextMate tokenization engine runs in the same process as the renderer and tokens are updated as the user types. VS Code extensions can contribute grammars through the grammar contribution point.
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TextMate grammars are a structured collection of regular expressions and are written as a plist (XML) or JSON files. VS Code's tokenization engine is powered by TextMate grammars. The tokenization of text is about breaking the text into segments and to classify each segment with a token type. To see both semantic and syntax token, use a built-in theme (for example, Dark+) on a TypeScript file.