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General source layout

  • src/bin contains binary tools:
    • encode JS source to Binary AST;
    • decode Binary AST back to JS source;
    • dump information on a file;
  • src/source contains tools for manipulating JS source:
    • parsing;
    • pretty-printing;
  • spec contains the specifications for the JS language, as webidl;
  • examples contains few additional tools/examples
    • compare compression between several algorithms;
    • generate random ASTs for testing;
    • test roundtrip encoding/decoding of a file.

Crates

Most of this project is contained in subcrates.

  • crates/binjs_shared contains shared utilities, used both at build-time and run-time. Features:
    • tools for dealing with JSON;
    • tools for dealing with ASTs
  • crates/binjs_meta is used mostly at build-time, to generate eg. the ES6 grammar or, in Firefox, to generate the SpiderMonkey parser. It may also be used at runtime. Features:
    • read a grammar specification from a webidl;
    • reflection of the grammar;
    • sanity tests on the grammar;
    • deanonymization of anonymous grammar nodes;
    • ...
  • crates/binjs_generate_library uses crates/binjs_meta to generate a strongly-typed AST and tools for a specific grammar, e.g. the ES6 grammar of spec/es6.webidl;
  • crates/binjs_io contains tools for manipulating the container format. It is entirely independent of the language being manipulated.
    • encoding/decoding specific low-level data structures from/to bytes;
    • token readers, token writers for these formats;
  • crates/binjs_generic offers generic tools to manipulate actual ASTs. These tools are not specialized to any grammar (hence the name generic), but rely upon the reflection of the grammar of crates/binjs_meta. These tools are slower and less safe than those of crates/binjs_es6 but offer a second implementation for testing purposes. Features:
    • generating random JSON ASTs for a grammar;
    • comparing two JSON ASTs in a grammar;
    • encoding/decoding entire JSON ASTs from/to bytes using a format defined in crates/binjs_io.
  • crates/binjs_es6 offers specialized tools to manipulate ES6 ASTs. Some of these tools are generated by crates/binjs_generate_library. Features:
    • a strongly-typed AST guaranteed to match the specs of spec/es6.webidl;
    • annotating scopes, eval, ...
    • serialization and deserialization of strongly-typed ES6 ASTs from/to bytes using a format defined in crates/binjs_io.