atom/spec/style-manager-spec.js

const temp = require('temp')
const StyleManager = require('../src/style-manager')

describe('StyleManager', () => {
  let [styleManager, addEvents, removeEvents, updateEvents] = []

  beforeEach(() => {
    styleManager = new StyleManager({configDirPath: temp.mkdirSync('atom-config')})
    addEvents = []
    removeEvents = []
    updateEvents = []
    styleManager.onDidAddStyleElement((event) => { addEvents.push(event) })
    styleManager.onDidRemoveStyleElement((event) => { removeEvents.push(event) })
    styleManager.onDidUpdateStyleElement((event) => { updateEvents.push(event) })
  })

  describe('::addStyleSheet(source, params)', () => {
    it('adds a style sheet based on the given source and returns a disposable allowing it to be removed', () => {
      const disposable = styleManager.addStyleSheet('a {color: red}')
      expect(addEvents.length).toBe(1)
      expect(addEvents[0].textContent).toBe('a {color: red}')
      const styleElements = styleManager.getStyleElements()
      expect(styleElements.length).toBe(1)
      expect(styleElements[0].textContent).toBe('a {color: red}')
      disposable.dispose()
      expect(removeEvents.length).toBe(1)
      expect(removeEvents[0].textContent).toBe('a {color: red}')
      expect(styleManager.getStyleElements().length).toBe(0)
    })

    describe('atom-text-editor shadow DOM selectors upgrades', () => {
      beforeEach(() => {
        // attach styles element to the DOM to parse CSS rules
        styleManager.onDidAddStyleElement((styleElement) => { jasmine.attachToDOM(styleElement) })
      })

      it('removes the ::shadow pseudo-element from atom-text-editor selectors', () => {
        styleManager.addStyleSheet(`
          atom-text-editor::shadow .class-1, atom-text-editor::shadow .class-2 { color: red }
          atom-text-editor::shadow > .class-3 { color: yellow }
          atom-text-editor .class-4 { color: blue }
          another-element::shadow .class-5 { color: white }
          atom-text-editor[data-grammar*=\"js\"]::shadow .class-6 { color: green; }
          atom-text-editor[mini].is-focused::shadow .class-7 { color: green; }
        `)
        expect(Array.from(styleManager.getStyleElements()[0].sheet.cssRules).map((r) => r.selectorText)).toEqual([
          'atom-text-editor.editor .class-1, atom-text-editor.editor .class-2',
          'atom-text-editor.editor > .class-3',
          'atom-text-editor .class-4',
          'another-element::shadow .class-5',
          'atom-text-editor[data-grammar*=\"js\"].editor .class-6',
          'atom-text-editor[mini].is-focused.editor .class-7'
        ])
      })

      describe('when a selector targets the atom-text-editor shadow DOM', () => {
        it('prepends "--syntax" to class selectors matching a grammar scope name and not already starting with "syntax--"', () => {
          styleManager.addStyleSheet(`
            .class-1 { color: red }
            .source > .js, .source.coffee { color: green }
            .syntax--source { color: gray }
            #id-1 { color: blue }
          `, {context: 'atom-text-editor'})
          expect(Array.from(styleManager.getStyleElements()[0].sheet.cssRules).map((r) => r.selectorText)).toEqual([
            '.class-1',
            '.syntax--source > .syntax--js, .syntax--source.syntax--coffee',
            '.syntax--source',
            '#id-1'
          ])

          styleManager.addStyleSheet(`
            .source > .js, .source.coffee { color: green }
            atom-text-editor::shadow .source > .js { color: yellow }
            atom-text-editor[mini].is-focused::shadow .source > .js { color: gray }
            atom-text-editor .source > .js { color: red }
          `)
          expect(Array.from(styleManager.getStyleElements()[1].sheet.cssRules).map((r) => r.selectorText)).toEqual([
            '.source > .js, .source.coffee',
            'atom-text-editor.editor .syntax--source > .syntax--js',
            'atom-text-editor[mini].is-focused.editor .syntax--source > .syntax--js',
            'atom-text-editor .source > .js'
          ])
        })
      })

      it('replaces ":host" with "atom-text-editor" only when the context of a style sheet is "atom-text-editor"', () => {
        styleManager.addStyleSheet(':host .class-1, :host .class-2 { color: red; }')
        expect(Array.from(styleManager.getStyleElements()[0].sheet.cssRules).map((r) => r.selectorText)).toEqual([
          ':host .class-1, :host .class-2'
        ])
        styleManager.addStyleSheet(':host .class-1, :host .class-2 { color: red; }', {context: 'atom-text-editor'})
        expect(Array.from(styleManager.getStyleElements()[1].sheet.cssRules).map((r) => r.selectorText)).toEqual([
          'atom-text-editor .class-1, atom-text-editor .class-2'
        ])
      })

      it('does not throw exceptions on rules with no selectors', () => {
        styleManager.addStyleSheet('@media screen {font-size: 10px}', {context: 'atom-text-editor'})
      })
    })

    describe('when a sourcePath parameter is specified', () => {
      it('ensures a maximum of one style element for the given source path, updating a previous if it exists', () => {
        const disposable1 = styleManager.addStyleSheet('a {color: red}', {sourcePath: '/foo/bar'})
        expect(addEvents.length).toBe(1)
        expect(addEvents[0].getAttribute('source-path')).toBe('/foo/bar')

        const disposable2 = styleManager.addStyleSheet('a {color: blue}', {sourcePath: '/foo/bar'})
        expect(addEvents.length).toBe(1)
        expect(updateEvents.length).toBe(1)
        expect(updateEvents[0].getAttribute('source-path')).toBe('/foo/bar')
        expect(updateEvents[0].textContent).toBe('a {color: blue}')
        disposable2.dispose()

        addEvents = []
        styleManager.addStyleSheet('a {color: yellow}', {sourcePath: '/foo/bar'})
        expect(addEvents.length).toBe(1)
        expect(addEvents[0].getAttribute('source-path')).toBe('/foo/bar')
        expect(addEvents[0].textContent).toBe('a {color: yellow}')
      })
    })

    describe('when a priority parameter is specified', () => {
      it('inserts the style sheet based on the priority', () => {
        styleManager.addStyleSheet('a {color: red}', {priority: 1})
        styleManager.addStyleSheet('a {color: blue}', {priority: 0})
        styleManager.addStyleSheet('a {color: green}', {priority: 2})
        styleManager.addStyleSheet('a {color: yellow}', {priority: 1})
        expect(styleManager.getStyleElements().map((elt) => elt.textContent)).toEqual([
          'a {color: blue}',
          'a {color: red}',
          'a {color: yellow}',
          'a {color: green}'
        ])
      })
    })
  })
})