A parser for proto files.
The purpose of proto-parser is to generate an AST for a proto file, regardless of injecting upper functions into the AST structure, such as encoding/decoding.
Proto-parser is developed based on protobuf.js, and uses some codes of protobuf.js。
Compared with protobuf.js, proto-parser is more focused on parsing. so, proto-parser gains some advantages:
- have less code and higher performance
- output more pure AST structure
- support TypeScript
Note that, the AST structure generated by proto-parser keeps basic compatible with that by protobuf.js.
npm install proto-parser
A code example:
import * as t from 'proto-parser';
const content = `
syntax = 'proto3';
message Foo {
string key = 1;
}
`;
const protoDocument = t.parse(content) as t.ProtoDocument;
console.log(JSON.stringify(protoDocument, null, 2));The resulted AST:
{
"syntax": "proto3",
"root": {
"name": "",
"fullName": "",
"syntaxType": "ProtoRoot",
"nested": {
"Foo": {
"name": "Foo",
"fullName": ".Foo",
"comment": null,
"syntaxType": "MessageDefinition",
"fields": {
"key": {
"name": "key",
"fullName": ".Foo.key",
"comment": null,
"type": {
"value": "string",
"syntaxType": "BaseType"
},
"id": 1,
"required": false,
"optional": true,
"repeated": false,
"map": false
}
}
}
}
},
"syntaxType": "ProtoDocument"
}Parse the content of a proto file to an AST.
The definition of ParseOption:
interface ParseOption {
// Set whether to keep the origin case. The default value is true.
keepCase?: boolean
// Set whether to enable alternateCommentMode. The default value is true.
alternateCommentMode?: boolean
// Set whether to resolve types. The default value is true.
resolve?: boolean
// Set whether to weak resolve types(do not throw errors when resolve failed).
// The default value is true.
weakResolve?: boolean
// Set whether to return pure json Object. The default value is true.
toJson?: boolean
}