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Parsing

A grammar describes the syntax of a programming language, and might be defined in Backus-Naur form (BNF). A lexer performs lexical analysis, turning text into tokens. A parser takes tokens and builds a data structure like an abstract syntax tree (AST). The parser is concerned with context: does the sequence of tokens fit the grammar? A compiler is a combined lexer and parser, built for a specific grammar.

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A serverless web service that allows you to watch YouTube videos directly on Discord without opening a browser. Can also generate embeds for your Markdown!

  • Updated May 12, 2025
  • TypeScript