📦 situ2001 / scoped-rem

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189import { test, expect } from 'vitest';
import { transformCss } from '../src/index.js';

test('transformCss basic - simple rem to calc', () => {
  const input = `
.foo {
  width: 1.2rem;
  height: 2rem;
  margin: 0.5rem 1rem;
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '26.6667vw',
  });

  expect(result).toContain(':root { --rem-relative-base: 26.6667vw; }');

  expect(result).toContain('calc(1.2 * var(--rem-relative-base))');
  expect(result).toContain('calc(2 * var(--rem-relative-base))');
  expect(result).toContain('calc(0.5 * var(--rem-relative-base))');
  expect(result).toContain('calc(1 * var(--rem-relative-base))');
});

test('should still transform rem to calc() even if rootval is not provided', () => {
  const input = `.foo { width: 1.2rem; }`.trim();

  const result = transformCss(input, 'test.css', {
    varname: 'my-base',
  });

  expect(result).toContain('calc(1.2 * var(--my-base))');
  expect(result).not.toContain(':root {');
  expect(result).not.toContain('--my-base:');
});

test('transformCss with custom varname and varselector', () => {
  const input = `
.comp {
  font-size: 1.5rem;
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '10vw',
    varname: 'my-base',
    varselector: '.my-component',
  });

  expect(result).toContain('.my-component { --my-base: 10vw; }');
  expect(result).toContain('calc(1.5 * var(--my-base))');
});

test('transformCss with precision', () => {
  const input = `
.foo {
  width: 1.23456rem;
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '16px',
    precision: 2,
  });

  expect(result).toContain('calc(1.23 * var(--rem-relative-base))');
});

test('transformCss should not transform non-rem units', () => {
  const input = `
.foo {
  width: 100px;
  height: 50%;
  margin: 1em;
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '26.6667vw',
  });

  expect(result).toContain('100px');
  expect(result).toContain('50%');
  expect(result).toContain('1em');

  expect(result).not.toContain('calc(100 * var');
  expect(result).not.toContain('calc(50 * var');
});

test('zero rem values', () => {
  const input = `
.foo {
  margin: 0rem;
  padding: 0rem 1rem;
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '26.6667vw',
  });

  expect(result).toContain('0 calc(1 * var(--rem-relative-base))');
});

test('nested rem values in shorthand', () => {
  {
    const input = `
.foo {
  margin: 1rem 0 2rem 0.5rem;
}
  `.trim();

    const result = transformCss(input, 'test.css', {
      rootval: '26.6667vw',
    });

    expect(result).toContain('calc(1 * var(--rem-relative-base))');
    expect(result).toContain('calc(2 * var(--rem-relative-base))');
    expect(result).toContain('calc(0.5 * var(--rem-relative-base))');
  }

  {
    const input = `
.foo {
  box-shadow: 0 0 5px 1rem rgba(0,0,0,0.1);
}
  `.trim();

    const result = transformCss(input, 'test.css', {
      rootval: '26.6667vw',
    });

    expect(result).toContain('0 0 5px calc(1 * var(--rem-relative-base)) rgba(0,0,0,0.1)');
  }
});

test('nested rem values in functions', () => {
  // simple calc
  {
    const input = `
.foo {
  width: calc(100% - 2rem);
  height: calc(1rem + 10px);
}
  `.trim();

    const result = transformCss(input, 'test.css', {
      rootval: '26.6667vw',
    });

    expect(result).toContain('calc(100% - calc(2 * var(--rem-relative-base)))');
    expect(result).toContain('calc(calc(1 * var(--rem-relative-base)) + 10px)');
  }

  // deeply nested calc
  {
    const input = `
.foo {
  width: calc(50% + calc(10px + 1rem));
}
  `.trim();

    const result = transformCss(input, 'test.css', {
      rootval: '26.6667vw',
    });

    expect(result).toContain('calc(50% + calc(10px + calc(1 * var(--rem-relative-base))))');
  }
});

test('transformCss should not transform rem in url()', () => {
  const input = `
.foo {
  background: url(114514rem.png);
  background-image: url("images/2rem-icon.svg");
  background-image: url('images/3rem-icon.svg');
}
  `.trim();

  const result = transformCss(input, 'test.css', {
    rootval: '26.6667vw',
  });

  expect(result).toContain('url(114514rem.png)');
  expect(result).toContain('url("images/2rem-icon.svg")');
  expect(result).toContain("url('images/3rem-icon.svg')");
  expect(result).not.toMatch(/url\([^)]+calc\(/);
});