/**
* Copyright (c) 2026 Ivan Iraci <ivan.iraci@professioneit.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
import { describe, it, expect } from 'vitest';
import {
toLspPosition,
fromLspPosition,
getLineContent,
fromLspRange,
} from '../../src/utils/position.js';
describe('position utilities', () => {
const simpleContent = 'line 1\nline 2\nline 3';
const unicodeContent = 'hello \u{1F600} world\nnext line';
describe('toLspPosition', () => {
it('converts 1-indexed to 0-indexed', () => {
const result = toLspPosition(1, 1, simpleContent);
expect(result.line).toBe(0);
expect(result.character).toBe(0);
});
it('handles multi-line content', () => {
const result = toLspPosition(2, 3, simpleContent);
expect(result.line).toBe(1);
expect(result.character).toBe(2);
});
it('converts out-of-bounds positions', () => {
// The function doesn't clamp - it just converts 1-indexed to 0-indexed
const result = toLspPosition(100, 100, simpleContent);
expect(result.line).toBe(99);
expect(result.character).toBe(99);
});
});
describe('fromLspPosition', () => {
it('converts 0-indexed to 1-indexed', () => {
const result = fromLspPosition({ line: 0, character: 0 }, simpleContent);
expect(result.line).toBe(1);
expect(result.column).toBe(1);
});
it('handles UTF-16 positions with emoji', () => {
// emoji \u{1F600} takes 2 UTF-16 code units
// "hello " = 6 chars, emoji = 2 UTF-16 units, " world" = 6 chars
// LSP position character 8 = after "hello " (6) + emoji (2) = start of " world"
// When converted back, this maps to column 8 (1-indexed)
const result = fromLspPosition({ line: 0, character: 8 }, unicodeContent);
expect(result.line).toBe(1);
expect(result.column).toBe(8); // 1-indexed column after emoji
});
});
describe('getLineContent', () => {
it('returns correct line content', () => {
expect(getLineContent(simpleContent, 1)).toBe('line 1');
expect(getLineContent(simpleContent, 2)).toBe('line 2');
expect(getLineContent(simpleContent, 3)).toBe('line 3');
});
it('returns undefined for out-of-bounds', () => {
expect(getLineContent(simpleContent, 0)).toBeUndefined();
expect(getLineContent(simpleContent, 100)).toBeUndefined();
});
});
describe('fromLspRange', () => {
it('converts LSP range to our format', () => {
const lspRange = {
start: { line: 0, character: 0 },
end: { line: 0, character: 4 },
};
const result = fromLspRange(lspRange, simpleContent);
expect(result.start.line).toBe(1);
expect(result.start.column).toBe(1);
expect(result.end.line).toBe(1);
expect(result.end.column).toBe(5);
});
});
});
