Crate boa_ast

Boa’s boa_ast crate implements an ECMAScript abstract syntax tree.

Crate Overview

boa_ast contains representations of Parse Nodes as defined by the ECMAScript spec. Some Parse Nodes are not represented by Boa’s AST, because a lot of grammar productions are only used to throw Early Errors, and don’t influence the evaluation of the AST itself.

Boa’s AST is mainly split in three main components: Declarations, Expressions and Statements, with StatementList being the primordial Parse Node that combines all of them to create a proper AST.

About Boa

Boa is an open-source, experimental ECMAScript Engine written in Rust for lexing, parsing and executing ECMAScript/JavaScript. Currently, Boa supports some of the language. More information can be viewed at Boa’s website.

Try out the most recent release with Boa’s live demo playground.

Boa Crates

• boa_cli - Boa’s CLI && REPL implementation
• boa_ast - Boa’s ECMAScript Abstract Syntax Tree.
• boa_engine - Boa’s implementation of ECMAScript builtin objects and execution.
• boa_gc - Boa’s garbage collector.
• boa_icu_provider - Boa’s ICU4X data provider.
• boa_interner - Boa’s string interner.
• boa_macros - Boa’s macros.
• boa_parser - Boa’s lexer and parser.
• boa_profiler - Boa’s code profiler.
• boa_runtime - Boa’s WebAPI features.
• boa_string - Boa’s ECMAScript string implementation.

Re-exports

pub use self::declaration::Declaration;

pub use self::expression::Expression;

pub use self::keyword::Keyword;

pub use self::statement::Statement;

Modules

declaration

The Declaration Parse Node, as defined by the spec.

expression

The Expression Parse Node, as defined by the spec.

function

This module contains Function and Class AST nodes.

keyword

The Keyword AST node, which represents reserved words of the ECMAScript language.

operations

Definitions of various Syntax-Directed Operations used in the spec.

pattern

A pattern binding or assignment node.

property

Property definition related types, used in object literals and class definitions.

scope

This module implements the binding scope for various AST nodes.

scope_analyzer

This module implements the scope analysis for the AST.

statement

The Statement Parse Node, as defined by the spec.

visitor

ECMAScript Abstract Syntax Tree visitors.

Macros

try_break

Try-like conditional unwrapping of ControlFlow.

Structs

Module

A Module source.

ModuleItemList

Module item list AST node.

Position

A position in the ECMAScript source code.

Script

A Script source.

Span

A span in the ECMAScript source code.

StatementList

List of statements.

Enums

ModuleItem

Module item AST node.

Punctuator

All of the punctuators used in ECMAScript.

StatementListItem

An item inside a StatementList Parse Node, as defined by the spec.