How can I get the line offset of a token?

[liuhq]

code snippet:

fn main() {
    let source_text = r"import React from 'react';

/**
 * A simple counter component
 */
export const Counter: React.FC = () => {
    const [count, setCount] = React.useState(0);

    return (
        <div class='p-2 m-3 w-full hover:bg-red *:text-sm'>
            <p class='text-blue'>Count: {count}</p>
            <button class='w-1/2 border' onClick={() => setCount(count + 1)}>Increment</button>
            <button class={'w-2/3 border border-pink'} onClick={() => setCount(count - 1)}>Decrement</button>
        </div>
    )
}";

    let allocator = Allocator::default();
    let source_type = SourceType::from_path("Counter.tsx").unwrap();
    let parsed = Parser::new(&allocator, &source_text, source_type).parse();

    let mut program = parsed.program;

    let mut visitor = MyVisitor::default();
    visitor.visit_program(&mut program);
}

#[derive(Default)]
struct MyVisitor {
    line_width: u32,
}

impl<'a> VisitMut<'a> for MyVisitor {
    fn visit_jsx_attribute(&mut self, it: &mut JSXAttribute<'a>) {
        if it.name.get_identifier().name == "class" {
            let value = it.value.as_ref().unwrap();
            match value {
                StringLiteral(string_literal) => {
                    println!("{}", string_literal.value);
                }
                ExpressionContainer(jsxexpression_container) => {}
                _ => {}
            }
        }
    }
}

I want to get every classname offset by line, e.g.

    return (
        <div class='p-2 m-3 w-full hover:bg-red *:text-sm'>
                   ^here

I want to get the line offset of 'p-2 ...', which is in column 19.

[Sysix]

You can use oxc_data_structures with the rope feature flag:
https://github.com/oxc-project/oxc/blob/main/crates/oxc_data_structures/src/rope.rs#L7

Example from the language_server:

oxc/crates/oxc_language_server/src/linter/error_with_position.rs

Lines 190 to 193 in 1611b4f

	pub fn offset_to_position(rope: &Rope, offset: u32, source_text: &str) -> Position {
	let (line, column) = get_line_column(rope, offset, source_text);
	Position::new(line, column)
	}