Note: This module is highly experimental and unstable. Use with caution.
A parser implementation for the MoonBit programming language, written in MoonBit, providing lexical analysis and syntax parsing capabilities.
This module defines the Abstract Syntax Tree (AST) and provides parsers for MoonBit source code. It includes both a hand-written LL(k) parser with error recovery and an LR(1) parser generated by moonyacc.
.
├── basic/ # shared locations, config, and diagnostic helpers
├── tokens/ # token definitions generated from yacc_parser/parser.mbty
├── lexer/ # lexical analysis components
├── attribute/ # attribute syntax and parser support
├── syntax/ # AST for MoonBit source code
├── handrolled_parser/ # hand-written LL(k) parser with error recovery
├── yacc_parser/ # moonyacc LR parser for MoonBit source files
├── mbti_ast/ # AST for .mbti interface files
├── mbti_parser/ # moonyacc LR parser for .mbti interface files
├── moon_config/ # moon.mod and moon.pkg configuration parsing
├── fmt/ # formatter library
├── cmd/ # command-line tools
│ ├── moonfmt/ # formatter executable
│ ├── mq/ # package query executable
│ └── wasm/mq/ # WebAssembly mq target
└── top.mbt # root package parsing entry points
///|test {
let source =
#| let number = 123
#| fn add(a: Int, b: Int) -> Int {
#| a + b
#| }
#| enum Color {
#| Red
#| Green
#| Blue
#| }
#| struct Point {
#| x: Int
#| y: Int
#| }
let (impls, _) = parse_string(source)
json_inspect(impls.map(impl_ => impl_.json_repr()), content=[
{
"kind": "Impl::TopLetDef",
"loc": null,
"children": {
"binder": {
"kind": "Binder",
"loc": null,
"children": { "name": "number" },
},
"ty": null,
"expr": {
"kind": "Expr::Constant",
"loc": null,
"children": {
"constant": {
"kind": "Constant::Int",
"loc": null,
"children": { "value": "123" },
},
},
},
"vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"is_constant": false,
"is_declare": false,
"attrs": {
"kind": "Impl::TopLetDef::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
{
"kind": "Impl::TopFuncDef",
"loc": null,
"children": {
"fun_decl": {
"kind": "FunDecl",
"loc": null,
"children": {
"type_name": null,
"name": {
"kind": "Binder",
"loc": null,
"children": { "name": "add" },
},
"has_error": null,
"is_async": null,
"decl_params": {
"kind": "FunDecl::ParameterList",
"loc": null,
"children": [
{
"kind": "Parameter::Positional",
"loc": null,
"children": {
"binder": {
"kind": "Binder",
"loc": null,
"children": { "name": "a" },
},
"ty": {
"kind": "Type::Name",
"loc": null,
"children": {
"constr_id": {
"kind": "ConstrId",
"loc": null,
"children": {
"id": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "Int" },
},
},
},
"tys": {
"kind": "Type::Name::TypeList",
"loc": null,
"children": [],
},
},
},
},
},
{
"kind": "Parameter::Positional",
"loc": null,
"children": {
"binder": {
"kind": "Binder",
"loc": null,
"children": { "name": "b" },
},
"ty": {
"kind": "Type::Name",
"loc": null,
"children": {
"constr_id": {
"kind": "ConstrId",
"loc": null,
"children": {
"id": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "Int" },
},
},
},
"tys": {
"kind": "Type::Name::TypeList",
"loc": null,
"children": [],
},
},
},
},
},
],
},
"quantifiers": {
"kind": "FunDecl::QuantifierList",
"loc": null,
"children": [],
},
"return_type": {
"kind": "Type::Name",
"loc": null,
"children": {
"constr_id": {
"kind": "ConstrId",
"loc": null,
"children": {
"id": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "Int" },
},
},
},
"tys": {
"kind": "Type::Name::TypeList",
"loc": null,
"children": [],
},
},
},
"error_type": {
"kind": "ErrorType::NoErrorType",
"loc": null,
"children": Json::empty_object(),
},
"vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"attrs": {
"kind": "FunDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
"where_clause": null,
"decl_body": {
"kind": "DeclBody::DeclBody",
"loc": null,
"children": {
"local_types": {
"kind": "DeclBody::DeclBody::LocalTypeList",
"loc": null,
"children": [],
},
"expr": {
"kind": "Expr::Infix",
"loc": null,
"children": {
"op": {
"kind": "Var",
"loc": null,
"children": {
"name": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "+" },
},
},
},
"lhs": {
"kind": "Expr::Ident",
"loc": null,
"children": {
"id": {
"kind": "Var",
"loc": null,
"children": {
"name": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "a" },
},
},
},
},
},
"rhs": {
"kind": "Expr::Ident",
"loc": null,
"children": {
"id": {
"kind": "Var",
"loc": null,
"children": {
"name": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "b" },
},
},
},
},
},
},
},
},
},
},
},
{
"kind": "Impl::TopTypeDef",
"loc": null,
"children": {
"value": {
"kind": "TypeDecl",
"loc": null,
"children": {
"tycon": "Color",
"params": {
"kind": "TypeDecl::ParamList",
"loc": null,
"children": [],
},
"components": {
"kind": "TypeDesc::Variant",
"loc": null,
"children": {
"value": {
"kind": "TypeDesc::Variant::ConstrList",
"loc": null,
"children": [
{
"kind": "ConstrDecl",
"loc": null,
"children": {
"name": {
"kind": "ConstrName",
"loc": null,
"children": { "name": "Red" },
},
"args": null,
"tag": null,
"attrs": {
"kind": "ConstrDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
{
"kind": "ConstrDecl",
"loc": null,
"children": {
"name": {
"kind": "ConstrName",
"loc": null,
"children": { "name": "Green" },
},
"args": null,
"tag": null,
"attrs": {
"kind": "ConstrDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
{
"kind": "ConstrDecl",
"loc": null,
"children": {
"name": {
"kind": "ConstrName",
"loc": null,
"children": { "name": "Blue" },
},
"args": null,
"tag": null,
"attrs": {
"kind": "ConstrDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
],
},
},
},
"attrs": {
"kind": "TypeDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
"type_vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"is_declare": false,
"deriving": {
"kind": "TypeDecl::DerivingList",
"loc": null,
"children": [],
},
},
},
},
},
{
"kind": "Impl::TopTypeDef",
"loc": null,
"children": {
"value": {
"kind": "TypeDecl",
"loc": null,
"children": {
"tycon": "Point",
"params": {
"kind": "TypeDecl::ParamList",
"loc": null,
"children": [],
},
"components": {
"kind": "TypeDesc::Record",
"loc": null,
"children": {
"value": {
"kind": "TypeDesc::Record::FieldList",
"loc": null,
"children": [
{
"kind": "FieldDecl",
"loc": null,
"children": {
"name": {
"kind": "FieldName",
"loc": null,
"children": { "label": "x" },
},
"ty": {
"kind": "Type::Name",
"loc": null,
"children": {
"constr_id": {
"kind": "ConstrId",
"loc": null,
"children": {
"id": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "Int" },
},
},
},
"tys": {
"kind": "Type::Name::TypeList",
"loc": null,
"children": [],
},
},
},
"mut": false,
"vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"attrs": {
"kind": "FieldDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
{
"kind": "FieldDecl",
"loc": null,
"children": {
"name": {
"kind": "FieldName",
"loc": null,
"children": { "label": "y" },
},
"ty": {
"kind": "Type::Name",
"loc": null,
"children": {
"constr_id": {
"kind": "ConstrId",
"loc": null,
"children": {
"id": {
"kind": "LongIdent::Ident",
"loc": null,
"children": { "value": "Int" },
},
},
},
"tys": {
"kind": "Type::Name::TypeList",
"loc": null,
"children": [],
},
},
},
"mut": false,
"vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"attrs": {
"kind": "FieldDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
},
},
],
},
},
},
"attrs": {
"kind": "TypeDecl::AttrList",
"loc": null,
"children": [],
},
"doc": "",
"type_vis": {
"kind": "Visibility::Default",
"loc": null,
"children": Json::empty_object(),
},
"is_declare": false,
"deriving": {
"kind": "TypeDecl::DerivingList",
"loc": null,
"children": [],
},
},
},
},
},
])
}You can also explore the parsing results using the AST Explorer.
This project uses the MoonBit build system:
moon update
moon check
moon testWe welcome contributions to this project! Please see CONTRIBUTING.md for guidelines on how to contribute and report bugs.