Just another custom JSON AST parser, but this time with position/range types compatible with monaco's API
npm install json-parse-astjavascript
var tokens = tokenize('{"json": "string"}'); //returns list of tokens
//tokens have the following attributes
// type: "inlinecomment"|"multilinecomment"|"whitespace"|"string"|"literal"|"number"|"punctuaction"
// position: IRange compatible with monaco's IRange-interface
// raw: string
// value: string Unescaped JSON string, parsed number, parsed literal (null, true, false)
`
Tokenizer additional features
`javascript
var [path, willBeValue] = getPathInObject(tokenize('{"foo": {"bar": "'));
//returns path == ["foo", "bar"] and willBeValue == true
`
Parser
`javascript
var ast = parseTokens(tokenize(testString));
//AST elements have
// type
// position: IRange
// raw: string
// value?: string
// parent?: AST
// children?: AST[]
//Find node at specified position
var node = findAtPosition(ast, {lineNumber: 4, column: 16})
`
Usage with monaco
This libraries intended use is for enhancing experience with custom JSON formats. See example use-cases below:
$3
`javascript
monaco.languages.registerCompletionItemProvider('json', {
provideCompletionItems: function(model, position) {
let textUntilPosition = model.getValueInRange({startLineNumber: 1, startColumn: 1, endLineNumber: position.lineNumber, endColumn: position.column});
let [jsonPath, willBeValue] = getPathInObject(tokenize(textUntilPosition));
if (willBeValue && jsonPath[jsonPath.length-1] === "dependencies") {
return { suggestions: listDependencies() };
} else {
return { suggestions: [] };
}
}
});
``