Semantic highlighting goes on top of the syntax highlighting. Highlighting based on semantic tokens is considered an addition to the TextMate-based syntax highlighting. 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 grammars contribution point.
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.
Tokenization: Breaking text into a list of tokens.There are two components to syntax highlighting: It is responsible for colorizing keywords like if or for in JavaScript differently than strings and comments and variable names.
Syntax highlighting determines the color and style of source code displayed in the Visual Studio Code editor.
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