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Copy pathcss-layer.spec.ts
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173 lines (154 loc) · 5.33 KB
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import { cssTreeParse } from '../../css/css-tree-parser';
import { parse as reworkCssParse } from '../../css/reworkcss.js';
import { RuleSet, StyleSheetSelectorScope } from './css-selector';
import { _populateRules } from './style-scope';
describe('cascade layers', () => {
function createWith(parse: (css: string, source: string) => any, css: string): { rulesets: RuleSet[]; keyframes: any[]; selectorScope: StyleSheetSelectorScope<any> } {
const parsed = parse(css, 'css-layer.ts@test');
const rulesets: RuleSet[] = [];
const keyframes = [];
_populateRules(parsed.stylesheet.rules, rulesets, keyframes);
return { rulesets, keyframes, selectorScope: new StyleSheetSelectorScope(rulesets) };
}
function create(css: string) {
return createWith(cssTreeParse, css);
}
function winningValue(css: string, node: any, property = 'color') {
const { selectorScope } = create(css);
const { selectors } = selectorScope.query(node);
const winner = selectors[selectors.length - 1];
return winner?.ruleset.declarations.find((d) => d.property === property)?.value;
}
it('populates rules inside @layer blocks', () => {
const { rulesets } = create(`@layer base { label { color: red; } }`);
expect(rulesets.length).toBe(1);
expect(rulesets[0].layerPath).toHaveLength(1);
expect(typeof rulesets[0].layerPath[0]).toBe('number');
});
it('orders layers by the statement form regardless of specificity and position', () => {
// #main outranks .login on both specificity and source order, but it sits in
// `low` — declared before `high` — so the layered .login rule still wins.
const winner = winningValue(
`
@layer low, high;
@layer high { .login { color: green; } }
@layer low { #main { color: blue; } }
`,
{ cssType: 'label', id: 'main', cssClasses: new Set(['login']) },
);
expect(winner).toBe('green');
});
it('orders layers by first block declaration when no statement exists', () => {
const winner = winningValue(
`
@layer first { #main { color: blue; } }
@layer second { .login { color: green; } }
`,
{ cssType: 'label', id: 'main', cssClasses: new Set(['login']) },
);
expect(winner).toBe('green');
});
it('lets unlayered rules beat every layered rule', () => {
const winner = winningValue(
`
@layer base { label { color: red; } }
* { color: blue; }
`,
{ cssType: 'label' },
);
expect(winner).toBe('blue');
});
it('lets unlayered rules win even when declared before the layer', () => {
const winner = winningValue(
`
* { color: blue; }
@layer base { label { color: red; } }
`,
{ cssType: 'label' },
);
expect(winner).toBe('blue');
});
it('matches nested layer blocks to dotted names', () => {
const winner = winningValue(
`
@layer outer { @layer inner { .login { color: red; } } }
@layer outer.inner { .login { color: green; } }
`,
{ cssType: 'label', cssClasses: new Set(['login']) },
);
// Both write to layer `outer.inner`; appended rules cascade by source order.
expect(winner).toBe('green');
});
it('orders nested layers beneath their parents', () => {
const winner = winningValue(
`
@layer a { .login { color: red; } }
@layer b.inner { .login { color: green; } }
`,
{ cssType: 'label', cssClasses: new Set(['login']) },
);
// a (ordinal 0) vs b.inner (ordinal [1, …]) — top level decides, b wins.
expect(winner).toBe('green');
});
it('gives each anonymous layer its own rank in source order', () => {
const winner = winningValue(
`
@layer { .login { color: red; } }
@layer { .login { color: green; } }
`,
{ cssType: 'label', cssClasses: new Set(['login']) },
);
expect(winner).toBe('green');
});
it('keeps unlayered rules stronger than anonymous layers', () => {
const winner = winningValue(
`
@layer { .login { color: red; } }
.login { color: blue; }
`,
{ cssType: 'label', cssClasses: new Set(['login']) },
);
expect(winner).toBe('blue');
});
it('preserves media queries on rules inside layers', () => {
const { rulesets } = create(`
@layer base {
@media only screen and (min-width: 1) {
.login { color: red; }
}
}
`);
expect(rulesets.length).toBe(1);
expect(rulesets[0].mediaQueryString).toBe('only screen and (min-width: 1)');
expect(rulesets[0].layerPath?.length).toBe(1);
});
it('collects keyframes declared inside layers', () => {
const { keyframes } = create(`
@layer base {
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
}
`);
expect(keyframes.length).toBe(1);
expect(keyframes[0].name).toBe('fade');
});
it('leaves ruleset layerPath unset for unlayered rules', () => {
const { rulesets } = create(`.login { color: red; }`);
expect(rulesets[0].layerPath).toBeUndefined();
});
it('parses @layer through the legacy rework parser (build-time css2json path)', () => {
// webpack's css2json-loader and vite's bundled-css serializer both run the
// rework parser — the AST they emit must carry layer nodes through to
// _populateRules, which is what this exercises end to end.
const { rulesets } = createWith(
(css, source) => reworkCssParse(css, { source }),
`
@layer low, high;
@layer high { .login { color: green; } }
@layer low { #main { color: blue; } }
`,
);
expect(rulesets.length).toBe(2);
expect(rulesets[0].layerPath).toHaveLength(1);
expect(rulesets[1].layerPath).toHaveLength(1);
});
});