angular-cn/packages/compiler/test/render3/style_parser_spec.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import {hyphenate, parse as parseStyle, stripUnnecessaryQuotes} from '../../src/render3/view/style_parser';

describe('style parsing', () => {
  it('should parse empty or blank strings', () => {
    const result1 = parseStyle('');
    expect(result1).toEqual([]);

    const result2 = parseStyle('    ');
    expect(result2).toEqual([]);
  });

  it('should parse a string into a key/value map', () => {
    const result = parseStyle('width:100px;height:200px;opacity:0');
    expect(result).toEqual(['width', '100px', 'height', '200px', 'opacity', '0']);
  });

  it('should allow empty values', () => {
    const result = parseStyle('width:;height:   ;');
    expect(result).toEqual(['width', '', 'height', '']);
  });

  it('should trim values and properties', () => {
    const result = parseStyle('width :333px ; height:666px    ; opacity: 0.5;');
    expect(result).toEqual(['width', '333px', 'height', '666px', 'opacity', '0.5']);
  });

  it('should chomp out start/end quotes', () => {
    const result = parseStyle(
        'content: "foo"; opacity: \'0.5\'; font-family: "Verdana", Helvetica, "sans-serif"');
    expect(result).toEqual(
        ['content', 'foo', 'opacity', '0.5', 'font-family', '"Verdana", Helvetica, "sans-serif"']);
  });

  it('should not mess up with quoted strings that contain [:;] values', () => {
    const result = parseStyle('content: "foo; man: guy"; width: 100px');
    expect(result).toEqual(['content', 'foo; man: guy', 'width', '100px']);
  });

  it('should not mess up with quoted strings that contain inner quote values', () => {
    const quoteStr = '"one \'two\' three \"four\" five"';
    const result = parseStyle(`content: ${quoteStr}; width: 123px`);
    expect(result).toEqual(['content', quoteStr, 'width', '123px']);
  });

  it('should respect parenthesis that are placed within a style', () => {
    const result = parseStyle('background-image: url("foo.jpg")');
    expect(result).toEqual(['background-image', 'url("foo.jpg")']);
  });

  it('should respect multi-level parenthesis that contain special [:;] characters', () => {
    const result = parseStyle('color: rgba(calc(50 * 4), var(--cool), :5;); height: 100px;');
    expect(result).toEqual(['color', 'rgba(calc(50 * 4), var(--cool), :5;)', 'height', '100px']);
  });

  it('should hyphenate style properties from camel case', () => {
    const result = parseStyle('borderWidth: 200px');
    expect(result).toEqual(['border-width', '200px']);
  });

  describe('quote chomping', () => {
    it('should remove the start and end quotes', () => {
      expect(stripUnnecessaryQuotes('\'foo bar\'')).toEqual('foo bar');
      expect(stripUnnecessaryQuotes('"foo bar"')).toEqual('foo bar');
    });

    it('should not remove quotes if the quotes are not at the start and end', () => {
      expect(stripUnnecessaryQuotes('foo bar')).toEqual('foo bar');
      expect(stripUnnecessaryQuotes('   foo bar   ')).toEqual('   foo bar   ');
      expect(stripUnnecessaryQuotes('\'foo\' bar')).toEqual('\'foo\' bar');
      expect(stripUnnecessaryQuotes('foo "bar"')).toEqual('foo "bar"');
    });

    it('should not remove quotes if there are inner quotes', () => {
      const str = '"Verdana", "Helvetica"';
      expect(stripUnnecessaryQuotes(str)).toEqual(str);
    });
  });

  describe('camelCasing => hyphenation', () => {
    it('should convert a camel-cased value to a hyphenated value', () => {
      expect(hyphenate('fooBar')).toEqual('foo-bar');
      expect(hyphenate('fooBarMan')).toEqual('foo-bar-man');
      expect(hyphenate('-fooBar-man')).toEqual('-foo-bar-man');
    });

    it('should make everything lowercase', () => {
      expect(hyphenate('-WebkitAnimation')).toEqual('-webkit-animation');
    });
  });
});