@krassowski/jupyterlab_go_to_definition/lib/history.js

Jump to definition of a variable or function in JupyterLab

const DB_ENTRY = 'jumpy_history';
export class JumpHistory {
    constructor(model_db) {
        this.model_db = model_db;
    }
    ensure_history_is_ready() {
        if (this.jump_history === undefined) {
            if (this.model_db.has(DB_ENTRY)) {
                this.jump_history = this.model_db.get(DB_ENTRY);
            }
            else {
                this.jump_history = this.model_db.createList(DB_ENTRY);
            }
        }
    }
    store(position) {
        this.ensure_history_is_ready();
        this.jump_history.push(JSON.stringify(position));
    }
    recollect() {
        this.ensure_history_is_ready();
        if (this.jump_history.length === 0) {
            return;
        }
        let last_position = this.jump_history.get(this.jump_history.length - 1);
        // being lazy here - undo addition instead of removal ;)
        this.jump_history.undo();
        return JSON.parse(last_position);
    }
}
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