prettylint/lib/diagnose.js

Run Prettier as a linter

import { LinesAndColumns } from "lines-and-columns";
import * as utils from "prettier-linter-helpers";
export var Operation;
(function (Operation) {
    Operation[Operation["Delete"] = 0] = "Delete";
    Operation[Operation["Insert"] = 1] = "Insert";
    Operation[Operation["Replace"] = 2] = "Replace";
})(Operation || (Operation = {}));
export function diagnose(input, output) {
    return utils
        .generateDifferences(input, output)
        .map((difference) => {
        const { offset: startOffset, deleteText = "", insertText = "", } = difference;
        const endOffset = startOffset + deleteText.length;
        const insertCode = utils.showInvisibles(insertText);
        const deleteCode = utils.showInvisibles(deleteText);
        let message;
        let operation;
        switch (difference.operation) {
            case "delete":
                operation = Operation.Delete;
                message = `Delete \`${deleteCode}\``;
                break;
            case "insert":
                operation = Operation.Insert;
                message = `Insert \`${insertCode}\``;
                break;
            case "replace":
                operation = Operation.Replace;
                message = `Replace \`${deleteCode}\` with \`${insertCode}\``;
                break;
            /* c8 ignore start */
            default:
                throw new Error(`Unexpected operation '${difference.operation}'`);
            /* c8 ignore stop */
        }
        const locator = new LinesAndColumns(input);
        const getLocation = (offset) => {
            const { line, column } = locator.locationForIndex(offset);
            return { line: line + 1, column: column + 1, offset };
        };
        return {
            start: getLocation(startOffset),
            end: getLocation(endOffset),
            message,
            operation,
            insertText: insertText,
            deleteText: deleteText,
        };
    });
}