Glossary¶

This page collects the Pegium terms that appear throughout the documentation.

Use it as a short-definition page, not as a replacement for the workflow or the subsystem references.

AST¶

The semantic tree built by parser rules and assignments. AST nodes are regular C++ types derived from pegium::AstNode.

CST¶

The concrete syntax tree that preserves source structure and hidden nodes. The CST is especially useful for formatting and source-aware editor features.

`PegiumParser`¶

The user-facing parser base class used to define Pegium grammars in C++.

`Terminal<T>`¶

A named lexical rule that matches contiguous text.

`Rule<T>`¶

A named non-terminal rule. When T is an AST type it becomes a parser rule; otherwise it becomes a data-type rule.

Skipper¶

The rule set that handles ignored and hidden tokens such as whitespace and comments between parser elements.

Reference¶

A source-level name stored in the AST that may later resolve to a target node.

Scope¶

The set of visible symbols available at one reference site.

Linking¶

The process of resolving a written reference to a concrete AST target.

Services¶

The language-specific objects that hold parser, references, validation, workspace, and LSP providers.

Document lifecycle¶

The staged pipeline through which a document moves from changed text to parsed, linked, indexed, and validated state.