An interactive concept flow for how a parser turns tokens into structure, from its assumptions through the main operation and boundary checks.
trace / request.md
readyA lexer groups characters into tokens such as identifiers, numbers, and punctuation. A parser consumes that token stream according to a grammar and builds a structured representation, often an abstract syntax tree. Separating these jobs makes it easier to handle whitespace, literals, precedence, and syntax errors coherently.
Use the stages in order to explain how a parser turns tokens into structure. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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