Crate sim_codec_javascript

Expand description

Bounded, lossless ECMAScript 2026 Script and Module frontend.

The public model is deliberately neutral syntax data. It has no compiler IR, runtime, TypeScript, Shape, or kernel dependency. Parser extensions can wrap Node and attach their own Origin without changing JavaScript syntax.

The frozen downstream extension seam is exactly Token, SyntaxTree, Node, Origin, and JavascriptBuilder. It carries syntax and lowering data only; TypeScript policy remains a one-way downstream concern.

Structs§

Diagnostic: Deterministic located frontend failure.
JavascriptBuilder: Public construction seam for JavaScript and syntax extensions.
JavascriptCodec: Runtime codec object for codec/javascript.
JavascriptCodecLib: Host-registered library installing codec/javascript.
Limits: Resource limits shared by lexing and parsing.
Node: A concrete node covering a contiguous token range.
Origin: Source identity attachable by JavaScript or downstream syntax extensions.
Span: Half-open UTF-8 byte range in the original source.
SyntaxTree: Complete lossless syntax tree.
Token: A lossless lexical token. Text is recovered using Token::span.

Enums§

Asi: Evidence for an explicit or automatic semicolon boundary.
DiagnosticCode: Stable diagnostic category.
Goal: Script or Module syntactic goal.
LexicalGoal: Parser-selected lexical goal governing slash and template recognition.
NodeKind: Neutral concrete-tree node category, stable for downstream extensions.
TokenKind: Kind of lossless token.

Constants§

CORPUS_MANIFEST_SHA256: SHA-256 of the checked source corpus manifest.
ECMA262_AUTHORITY: Immutable specification authority used by this frontend.
ECMA262_EDITION: Frozen ECMA-262 edition.
ECMA262_FROZEN_ON: Date on which the edition identity and grammar inventory were frozen.
JAVASCRIPT_CODEC_ID: Stable local id used before a host assigns codec/javascript an id.
TEST262_REVISION: Frozen Test262 evidence corpus revision. Test262 is an oracle, not a dependency.

Functions§

decode_javascript: Decode Script source using the shared codec budget.
decode_javascript_located: Decode into a root-located expression.
decode_javascript_tree: Decode into a recursively located expression tree.
encode_javascript: Canonically encode lowered forms or the established tagged fallback.
lower_javascript: Lower a complete tree to stable javascript/* forms.
parse_module: Parses a Module with default bounds.
parse_module_with_limits: Parses a Module with explicit bounds.
parse_script: Parses a Script with default bounds.
parse_script_with_limits: Parses a Script with explicit bounds.
tokenize: Tokenizes with default limits, selecting slash goals from preceding tokens.
tokenize_with_limits: Tokenizes with explicit resource limits.