angular-docs-cn/packages/compiler/test/render3/view/i18n_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 {AST} from '../../../src/expression_parser/ast';
import {Lexer} from '../../../src/expression_parser/lexer';
import {Parser} from '../../../src/expression_parser/parser';
import * as i18n from '../../../src/i18n/i18n_ast';
import * as o from '../../../src/output/output_ast';
import {ParseSourceSpan} from '../../../src/parse_util';
import * as t from '../../../src/render3/r3_ast';
import {I18nContext} from '../../../src/render3/view/i18n/context';
import {serializeI18nMessageForGetMsg} from '../../../src/render3/view/i18n/get_msg_utils';
import {serializeIcuNode} from '../../../src/render3/view/i18n/icu_serializer';
import {serializeI18nMessageForLocalize} from '../../../src/render3/view/i18n/localize_utils';
import {I18nMeta, parseI18nMeta} from '../../../src/render3/view/i18n/meta';
import {formatI18nPlaceholderName} from '../../../src/render3/view/i18n/util';
import {LEADING_TRIVIA_CHARS} from '../../../src/render3/view/template';

import {parseR3 as parse} from './util';

const expressionParser = new Parser(new Lexer());
const i18nOf = (element: t.Node&{i18n?: i18n.I18nMeta}) => element.i18n!;

describe('I18nContext', () => {
  it('should support i18n content collection', () => {
    const ref = o.variable('ref');
    const ast = new i18n.Message([], {}, {}, '', '', '');
    const ctx = new I18nContext(5, ref, 0, null, ast);

    // basic checks
    expect(ctx.isRoot).toBe(true);
    expect(ctx.isResolved).toBe(true);
    expect(ctx.id).toBe(0);
    expect(ctx.ref).toBe(ref);
    expect(ctx.index).toBe(5);
    expect(ctx.templateIndex).toBe(null);

    const tree = parse('<div i18n>A {{ valueA }} <div> B </div><p *ngIf="visible"> C </p></div>');
    const [boundText, element, template] = (tree.nodes[0] as t.Element).children;

    // data collection checks
    expect(ctx.placeholders.size).toBe(0);
    ctx.appendBoundText(i18nOf(boundText));       // interpolation
    ctx.appendElement(i18nOf(element), 1);        // open tag
    ctx.appendElement(i18nOf(element), 1, true);  // close tag
    ctx.appendTemplate(i18nOf(template), 2);      // open + close tags
    expect(ctx.placeholders.size).toBe(5);

    // binding collection checks
    expect(ctx.bindings.size).toBe(0);
    ctx.appendBinding(expressionParser.parseInterpolation('{{ valueA }}', '', 0) as AST);
    ctx.appendBinding(expressionParser.parseInterpolation('{{ valueB }}', '', 0) as AST);
    expect(ctx.bindings.size).toBe(2);
  });

  it('should support nested contexts', () => {
    const template = `
      <div i18n>
        A {{ valueA }}
        <div>A</div>
        <b *ngIf="visible">
          B {{ valueB }}
          <div>B</div>
          C {{ valueC }}
        </b>
      </div>
    `;
    const tree = parse(template);
    const root = tree.nodes[0] as t.Element;
    const [boundTextA, elementA, templateA] = root.children;
    const elementB = (templateA as t.Template).children[0] as t.Element;
    const [boundTextB, elementC, boundTextC] = (elementB as t.Element).children;

    // simulate I18nContext for a given template
    const ctx = new I18nContext(1, o.variable('ctx'), 0, null, root.i18n!);

    // set data for root ctx
    ctx.appendBoundText(i18nOf(boundTextA));
    ctx.appendBinding(expressionParser.parseInterpolation('{{ valueA }}', '', 0) as AST);
    ctx.appendElement(i18nOf(elementA), 0);
    ctx.appendTemplate(i18nOf(templateA), 1);
    ctx.appendElement(i18nOf(elementA), 0, true);
    expect(ctx.bindings.size).toBe(1);
    expect(ctx.placeholders.size).toBe(5);
    expect(ctx.isResolved).toBe(false);

    // create child context
    const childCtx = ctx.forkChildContext(2, 1, (templateA as t.Template).i18n!);
    expect(childCtx.bindings.size).toBe(0);
    expect(childCtx.isRoot).toBe(false);

    // set data for child context
    childCtx.appendElement(i18nOf(elementB), 0);
    childCtx.appendBoundText(i18nOf(boundTextB));
    childCtx.appendBinding(expressionParser.parseInterpolation('{{ valueB }}', '', 0) as AST);
    childCtx.appendElement(i18nOf(elementC), 1);
    childCtx.appendElement(i18nOf(elementC), 1, true);
    childCtx.appendBoundText(i18nOf(boundTextC));
    childCtx.appendBinding(expressionParser.parseInterpolation('{{ valueC }}', '', 0) as AST);
    childCtx.appendElement(i18nOf(elementB), 0, true);

    expect(childCtx.bindings.size).toBe(2);
    expect(childCtx.placeholders.size).toBe(6);

    // ctx bindings and placeholders are not shared,
    // so root bindings and placeholders do not change
    expect(ctx.bindings.size).toBe(1);
    expect(ctx.placeholders.size).toBe(5);

    // reconcile
    ctx.reconcileChildContext(childCtx);

    // verify placeholders
    const expected = new Map([
      ['INTERPOLATION', '<27>0<EFBFBD>'], ['START_TAG_DIV', '<27>#0<>|<7C>#1:1<>'],
      ['START_BOLD_TEXT', '<27>*1:1<><31>#0:1<>'], ['CLOSE_BOLD_TEXT', '<27>/#0:1<><31>/*1:1<>'],
      ['CLOSE_TAG_DIV', '<27>/#0<>|<7C>/#1:1<>'], ['INTERPOLATION_1', '<27>0:1<>'], ['INTERPOLATION_2', '<27>1:1<>']
    ]);
    const phs = ctx.getSerializedPlaceholders();
    expected.forEach((value, key) => {
      expect(phs.get(key)!.join('|')).toEqual(value);
    });

    // placeholders are added into the root ctx
    expect(phs.size).toBe(expected.size);

    // root context is considered resolved now
    expect(ctx.isResolved).toBe(true);

    // bindings are not merged into root ctx
    expect(ctx.bindings.size).toBe(1);
  });

  it('should support templates based on <ng-template>', () => {
    const template = `
      <ng-template i18n>
        Level A
        <ng-template>
          Level B
          <ng-template>
            Level C
          </ng-template>
        </ng-template>
      </ng-template>
    `;
    const tree = parse(template);
    const root = tree.nodes[0] as t.Template;

    const [textA, templateA] = root.children;
    const [textB, templateB] = (templateA as t.Template).children;
    const [textC] = (templateB as t.Template).children;

    // simulate I18nContext for a given template
    const ctxLevelA = new I18nContext(0, o.variable('ctx'), 0, null, root.i18n!);

    // create Level A context
    ctxLevelA.appendTemplate(i18nOf(templateA), 1);
    expect(ctxLevelA.placeholders.size).toBe(2);
    expect(ctxLevelA.isResolved).toBe(false);

    // create Level B context
    const ctxLevelB = ctxLevelA.forkChildContext(0, 1, (templateA as t.Template).i18n!);
    ctxLevelB.appendTemplate(i18nOf(templateB), 1);
    expect(ctxLevelB.isRoot).toBe(false);

    // create Level 2 context
    const ctxLevelC = ctxLevelB.forkChildContext(0, 1, (templateB as t.Template).i18n!);
    expect(ctxLevelC.isRoot).toBe(false);

    // reconcile
    ctxLevelB.reconcileChildContext(ctxLevelC);
    ctxLevelA.reconcileChildContext(ctxLevelB);

    // verify placeholders
    const expected = new Map(
        [['START_TAG_NG-TEMPLATE', '<27>*1:1<>|<7C>*1:2<>'], ['CLOSE_TAG_NG-TEMPLATE', '<27>/*1:2<>|<7C>/*1:1<>']]);
    const phs = ctxLevelA.getSerializedPlaceholders();
    expected.forEach((value, key) => {
      expect(phs.get(key)!.join('|')).toEqual(value);
    });

    // placeholders are added into the root ctx
    expect(phs.size).toBe(expected.size);

    // root context is considered resolved now
    expect(ctxLevelA.isResolved).toBe(true);
  });
});

describe('Utils', () => {
  it('formatI18nPlaceholderName', () => {
    const cases = [
      // input, output
      ['', ''], ['ICU', 'icu'], ['ICU_1', 'icu_1'], ['ICU_1000', 'icu_1000'],
      ['START_TAG_NG-CONTAINER', 'startTagNgContainer'],
      ['START_TAG_NG-CONTAINER_1', 'startTagNgContainer_1'], ['CLOSE_TAG_ITALIC', 'closeTagItalic'],
      ['CLOSE_TAG_BOLD_1', 'closeTagBold_1']
    ];
    cases.forEach(([input, output]) => {
      expect(formatI18nPlaceholderName(input)).toEqual(output);
    });
  });

  describe('metadata serialization', () => {
    it('parseI18nMeta()', () => {
      expect(parseI18nMeta('')).toEqual(meta());
      expect(parseI18nMeta('desc')).toEqual(meta('', '', 'desc'));
      expect(parseI18nMeta('desc@@id')).toEqual(meta('id', '', 'desc'));
      expect(parseI18nMeta('meaning|desc')).toEqual(meta('', 'meaning', 'desc'));
      expect(parseI18nMeta('meaning|desc@@id')).toEqual(meta('id', 'meaning', 'desc'));
      expect(parseI18nMeta('@@id')).toEqual(meta('id', '', ''));

      expect(parseI18nMeta('\n   ')).toEqual(meta());
      expect(parseI18nMeta('\n   desc\n   ')).toEqual(meta('', '', 'desc'));
      expect(parseI18nMeta('\n   desc@@id\n   ')).toEqual(meta('id', '', 'desc'));
      expect(parseI18nMeta('\n   meaning|desc\n   ')).toEqual(meta('', 'meaning', 'desc'));
      expect(parseI18nMeta('\n   meaning|desc@@id\n   ')).toEqual(meta('id', 'meaning', 'desc'));
      expect(parseI18nMeta('\n   @@id\n   ')).toEqual(meta('id', '', ''));
    });

    it('serializeI18nHead()', () => {
      expect(o.localizedString(meta(), [literal('')], [], []).serializeI18nHead())
          .toEqual({cooked: '', raw: '', range: jasmine.any(ParseSourceSpan)});
      expect(o.localizedString(meta('', '', 'desc'), [literal('')], [], []).serializeI18nHead())
          .toEqual({cooked: ':desc:', raw: ':desc:', range: jasmine.any(ParseSourceSpan)});
      expect(o.localizedString(meta('id', '', 'desc'), [literal('')], [], []).serializeI18nHead())
          .toEqual({cooked: ':desc@@id:', raw: ':desc@@id:', range: jasmine.any(ParseSourceSpan)});
      expect(
          o.localizedString(meta('', 'meaning', 'desc'), [literal('')], [], []).serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc:',
            raw: ':meaning|desc:',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', 'meaning', 'desc'), [literal('')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc@@id:',
            raw: ':meaning|desc@@id:',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', '', ''), [literal('')], [], []).serializeI18nHead())
          .toEqual({cooked: ':@@id:', raw: ':@@id:', range: jasmine.any(ParseSourceSpan)});

      // Escaping colons (block markers)
      expect(o.localizedString(meta('id:sub_id', 'meaning', 'desc'), [literal('')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc@@id:sub_id:',
            raw: ':meaning|desc@@id\\:sub_id:',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', 'meaning:sub_meaning', 'desc'), [literal('')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning:sub_meaning|desc@@id:',
            raw: ':meaning\\:sub_meaning|desc@@id:',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', 'meaning', 'desc:sub_desc'), [literal('')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc:sub_desc@@id:',
            raw: ':meaning|desc\\:sub_desc@@id:',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', 'meaning', 'desc'), [literal('message source')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc@@id:message source',
            raw: ':meaning|desc@@id:message source',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('id', 'meaning', 'desc'), [literal(':message source')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':meaning|desc@@id::message source',
            raw: ':meaning|desc@@id::message source',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('', '', ''), [literal('message source')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: 'message source',
            raw: 'message source',
            range: jasmine.any(ParseSourceSpan)
          });
      expect(o.localizedString(meta('', '', ''), [literal(':message source')], [], [])
                 .serializeI18nHead())
          .toEqual({
            cooked: ':message source',
            raw: '\\:message source',
            range: jasmine.any(ParseSourceSpan)
          });
    });

    it('serializeI18nPlaceholderBlock()', () => {
      expect(o.localizedString(meta('', '', ''), [literal(''), literal('')], [literal('')], [])
                 .serializeI18nTemplatePart(1))
          .toEqual({cooked: '', raw: '', range: jasmine.any(ParseSourceSpan)});
      expect(o.localizedString(
                  meta('', '', ''), [literal(''), literal('')],
                  [new o.LiteralPiece('abc', {} as any)], [])
                 .serializeI18nTemplatePart(1))
          .toEqual({cooked: ':abc:', raw: ':abc:', range: jasmine.any(ParseSourceSpan)});
      expect(
          o.localizedString(meta('', '', ''), [literal(''), literal('message')], [literal('')], [])
              .serializeI18nTemplatePart(1))
          .toEqual({cooked: 'message', raw: 'message', range: jasmine.any(ParseSourceSpan)});
      expect(o.localizedString(
                  meta('', '', ''), [literal(''), literal('message')], [literal('abc')], [])
                 .serializeI18nTemplatePart(1))
          .toEqual(
              {cooked: ':abc:message', raw: ':abc:message', range: jasmine.any(ParseSourceSpan)});
      expect(
          o.localizedString(meta('', '', ''), [literal(''), literal(':message')], [literal('')], [])
              .serializeI18nTemplatePart(1))
          .toEqual({cooked: ':message', raw: '\\:message', range: jasmine.any(ParseSourceSpan)});
      expect(o.localizedString(
                  meta('', '', ''), [literal(''), literal(':message')], [literal('abc')], [])
                 .serializeI18nTemplatePart(1))
          .toEqual(
              {cooked: ':abc::message', raw: ':abc::message', range: jasmine.any(ParseSourceSpan)});
    });

    function meta(customId?: string, meaning?: string, description?: string): I18nMeta {
      return {customId, meaning, description};
    }
  });
});

describe('serializeI18nMessageForGetMsg', () => {
  const serialize = (input: string): string => {
    const tree = parse(`<div i18n>${input}</div>`);
    const root = tree.nodes[0] as t.Element;
    return serializeI18nMessageForGetMsg(root.i18n as i18n.Message);
  };

  it('should serialize plain text for `GetMsg()`', () => {
    expect(serialize('Some text')).toEqual('Some text');
  });

  it('should serialize text with interpolation for `GetMsg()`', () => {
    expect(serialize('Some text {{ valueA }} and {{ valueB + valueC }}'))
        .toEqual('Some text {$interpolation} and {$interpolation_1}');
  });

  it('should serialize interpolation with named placeholder for `GetMsg()`', () => {
    expect(serialize('{{ valueB + valueC // i18n(ph="PLACEHOLDER NAME") }}'))
        .toEqual('{$placeholderName}');
  });

  it('should serialize content with HTML tags for `GetMsg()`', () => {
    expect(serialize('A <span>B<div>C</div></span> D'))
        .toEqual('A {$startTagSpan}B{$startTagDiv}C{$closeTagDiv}{$closeTagSpan} D');
  });

  it('should serialize simple ICU for `GetMsg()`', () => {
    expect(serialize('{age, plural, 10 {ten} other {other}}'))
        .toEqual('{VAR_PLURAL, plural, 10 {ten} other {other}}');
  });

  it('should serialize nested ICUs for `GetMsg()`', () => {
    expect(serialize(
               '{age, plural, 10 {ten {size, select, 1 {one} 2 {two} other {2+}}} other {other}}'))
        .toEqual(
            '{VAR_PLURAL, plural, 10 {ten {VAR_SELECT, select, 1 {one} 2 {two} other {2+}}} other {other}}');
  });

  it('should serialize ICU with nested HTML for `GetMsg()`', () => {
    expect(serialize('{age, plural, 10 {<b>ten</b>} other {<div class="A">other</div>}}'))
        .toEqual(
            '{VAR_PLURAL, plural, 10 {{START_BOLD_TEXT}ten{CLOSE_BOLD_TEXT}} other {{START_TAG_DIV}other{CLOSE_TAG_DIV}}}');
  });

  it('should serialize ICU with nested HTML containing further ICUs for `GetMsg()`', () => {
    expect(
        serialize(
            '{gender, select, male {male} female {female} other {other}}<div>{gender, select, male {male} female {female} other {other}}</div>'))
        .toEqual('{$icu}{$startTagDiv}{$icu}{$closeTagDiv}');
  });
});

describe('serializeI18nMessageForLocalize', () => {
  const serialize = (input: string) => {
    const tree = parse(`<div i18n>${input}</div>`, {leadingTriviaChars: LEADING_TRIVIA_CHARS});
    const root = tree.nodes[0] as t.Element;
    return serializeI18nMessageForLocalize(root.i18n as i18n.Message);
  };

  it('should serialize plain text for `$localize()`', () => {
    expect(serialize('Some text'))
        .toEqual({messageParts: [literal('Some text')], placeHolders: []});
  });

  it('should serialize text with interpolation for `$localize()`', () => {
    expect(serialize('Some text {{ valueA }} and {{ valueB + valueC }} done')).toEqual({
      messageParts: [literal('Some text '), literal(' and '), literal(' done')],
      placeHolders: [placeholder('INTERPOLATION'), placeholder('INTERPOLATION_1')],
    });
  });

  it('should compute source-spans when serializing text with interpolation for `$localize()`',
     () => {
       const {messageParts, placeHolders} =
           serialize('Some text {{ valueA }} and {{ valueB + valueC }} done');

       expect(messageParts[0].text).toEqual('Some text ');
       expect(messageParts[0].sourceSpan.toString()).toEqual('Some text ');
       expect(messageParts[1].text).toEqual(' and ');
       expect(messageParts[1].sourceSpan.toString()).toEqual(' and ');
       expect(messageParts[2].text).toEqual(' done');
       expect(messageParts[2].sourceSpan.toString()).toEqual(' done');

       expect(placeHolders[0].text).toEqual('INTERPOLATION');
       expect(placeHolders[0].sourceSpan.toString()).toEqual('{{ valueA }}');
       expect(placeHolders[1].text).toEqual('INTERPOLATION_1');
       expect(placeHolders[1].sourceSpan.toString()).toEqual('{{ valueB + valueC }}');
     });

  it('should serialize text with interpolation at start for `$localize()`', () => {
    expect(serialize('{{ valueA }} and {{ valueB + valueC }} done')).toEqual({
      messageParts: [literal(''), literal(' and '), literal(' done')],
      placeHolders: [placeholder('INTERPOLATION'), placeholder('INTERPOLATION_1')],
    });
  });


  it('should serialize text with interpolation at end for `$localize()`', () => {
    expect(serialize('Some text {{ valueA }} and {{ valueB + valueC }}')).toEqual({
      messageParts: [literal('Some text '), literal(' and '), literal('')],
      placeHolders: [placeholder('INTERPOLATION'), placeholder('INTERPOLATION_1')],
    });
  });


  it('should serialize only interpolation for `$localize()`', () => {
    expect(serialize('{{ valueB + valueC }}')).toEqual({
      messageParts: [literal(''), literal('')],
      placeHolders: [placeholder('INTERPOLATION')]
    });
  });


  it('should serialize interpolation with named placeholder for `$localize()`', () => {
    expect(serialize('{{ valueB + valueC // i18n(ph="PLACEHOLDER NAME") }}')).toEqual({
      messageParts: [literal(''), literal('')],
      placeHolders: [placeholder('PLACEHOLDER_NAME')]
    });
  });


  it('should serialize content with HTML tags for `$localize()`', () => {
    expect(serialize('A <span>B<div>C</div></span> D')).toEqual({
      messageParts: [literal('A '), literal('B'), literal('C'), literal(''), literal(' D')],
      placeHolders: [
        placeholder('START_TAG_SPAN'), placeholder('START_TAG_DIV'), placeholder('CLOSE_TAG_DIV'),
        placeholder('CLOSE_TAG_SPAN')
      ]
    });
  });


  it('should compute source-spans when serializing content with HTML tags for `$localize()`',
     () => {
       const {messageParts, placeHolders} = serialize('A <span>B<div>C</div></span> D');

       expect(messageParts[0].text).toEqual('A ');
       expect(messageParts[0].sourceSpan.toString()).toEqual('A ');
       expect(messageParts[1].text).toEqual('B');
       expect(messageParts[1].sourceSpan.toString()).toEqual('B');
       expect(messageParts[2].text).toEqual('C');
       expect(messageParts[2].sourceSpan.toString()).toEqual('C');
       expect(messageParts[3].text).toEqual('');
       expect(messageParts[3].sourceSpan.toString()).toEqual('');
       expect(messageParts[4].text).toEqual(' D');
       expect(messageParts[4].sourceSpan.toString()).toEqual('D');

       expect(placeHolders[0].text).toEqual('START_TAG_SPAN');
       expect(placeHolders[0].sourceSpan.toString()).toEqual('<span>');
       expect(placeHolders[1].text).toEqual('START_TAG_DIV');
       expect(placeHolders[1].sourceSpan.toString()).toEqual('<div>');
       expect(placeHolders[2].text).toEqual('CLOSE_TAG_DIV');
       expect(placeHolders[2].sourceSpan.toString()).toEqual('</div>');
       expect(placeHolders[3].text).toEqual('CLOSE_TAG_SPAN');
       expect(placeHolders[3].sourceSpan.toString()).toEqual('</span>');
     });

  it('should create the correct source-spans when there are two placeholders next to each other',
     () => {
       const {messageParts, placeHolders} = serialize('<b>{{value}}</b>');
       expect(messageParts[0].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[0].sourceSpan)).toEqual('"" (10-10)');
       expect(messageParts[1].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[1].sourceSpan)).toEqual('"" (13-13)');
       expect(messageParts[2].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[2].sourceSpan)).toEqual('"" (22-22)');
       expect(messageParts[3].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[3].sourceSpan)).toEqual('"" (26-26)');

       expect(placeHolders[0].text).toEqual('START_BOLD_TEXT');
       expect(humanizeSourceSpan(placeHolders[0].sourceSpan)).toEqual('"<b>" (10-13)');
       expect(placeHolders[1].text).toEqual('INTERPOLATION');
       expect(humanizeSourceSpan(placeHolders[1].sourceSpan)).toEqual('"{{value}}" (13-22)');
       expect(placeHolders[2].text).toEqual('CLOSE_BOLD_TEXT');
       expect(humanizeSourceSpan(placeHolders[2].sourceSpan)).toEqual('"</b>" (22-26)');
     });

  it('should create the correct placeholder source-spans when there is skipped leading whitespace',
     () => {
       const {messageParts, placeHolders} = serialize('<b>   {{value}}</b>');
       expect(messageParts[0].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[0].sourceSpan)).toEqual('"" (10-10)');
       expect(messageParts[1].text).toEqual('   ');
       expect(humanizeSourceSpan(messageParts[1].sourceSpan)).toEqual('"   " (13-16)');
       expect(messageParts[2].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[2].sourceSpan)).toEqual('"" (25-25)');
       expect(messageParts[3].text).toEqual('');
       expect(humanizeSourceSpan(messageParts[3].sourceSpan)).toEqual('"" (29-29)');

       expect(placeHolders[0].text).toEqual('START_BOLD_TEXT');
       expect(humanizeSourceSpan(placeHolders[0].sourceSpan)).toEqual('"<b>" (10-13)');
       expect(placeHolders[1].text).toEqual('INTERPOLATION');
       expect(humanizeSourceSpan(placeHolders[1].sourceSpan)).toEqual('"{{value}}" (16-25)');
       expect(placeHolders[2].text).toEqual('CLOSE_BOLD_TEXT');
       expect(humanizeSourceSpan(placeHolders[2].sourceSpan)).toEqual('"</b>" (25-29)');
     });

  it('should serialize simple ICU for `$localize()`', () => {
    expect(serialize('{age, plural, 10 {ten} other {other}}')).toEqual({
      messageParts: [literal('{VAR_PLURAL, plural, 10 {ten} other {other}}')],
      placeHolders: []
    });
  });

  it('should serialize nested ICUs for `$localize()`', () => {
    expect(serialize(
               '{age, plural, 10 {ten {size, select, 1 {one} 2 {two} other {2+}}} other {other}}'))
        .toEqual({
          messageParts: [
            literal(
                '{VAR_PLURAL, plural, 10 {ten {VAR_SELECT, select, 1 {one} 2 {two} other {2+}}} other {other}}')
          ],
          placeHolders: []
        });
  });

  it('should serialize ICU with embedded HTML for `$localize()`', () => {
    expect(serialize('{age, plural, 10 {<b>ten</b>} other {<div class="A">other</div>}}')).toEqual({
      messageParts: [
        literal(
            '{VAR_PLURAL, plural, 10 {{START_BOLD_TEXT}ten{CLOSE_BOLD_TEXT}} other {{START_TAG_DIV}other{CLOSE_TAG_DIV}}}')
      ],
      placeHolders: []
    });
  });

  it('should serialize ICU with embedded interpolation for `$localize()`', () => {
    expect(serialize('{age, plural, 10 {<b>ten</b>} other {{{age}} years old}}')).toEqual({
      messageParts: [
        literal(
            '{VAR_PLURAL, plural, 10 {{START_BOLD_TEXT}ten{CLOSE_BOLD_TEXT}} other {{INTERPOLATION} years old}}')
      ],
      placeHolders: []
    });
  });

  it('should serialize ICU with nested HTML containing further ICUs for `$localize()`', () => {
    expect(
        serialize(
            '{gender, select, male {male} female {female} other {other}}<div>{gender, select, male {male} female {female} other {other}}</div>'))
        .toEqual({
          messageParts: [literal(''), literal(''), literal(''), literal(''), literal('')],
          placeHolders: [
            placeholder('ICU'), placeholder('START_TAG_DIV'), placeholder('ICU'),
            placeholder('CLOSE_TAG_DIV')
          ]
        });
  });

  it('should serialize nested ICUs with embedded interpolation for `$localize()`', () => {
    expect(
        serialize(
            '{age, plural, 10 {ten {size, select, 1 {{{ varOne }}} 2 {{{ varTwo }}} other {2+}}} other {other}}'))
        .toEqual({
          messageParts: [
            literal(
                '{VAR_PLURAL, plural, 10 {ten {VAR_SELECT, select, 1 {{INTERPOLATION}} 2 {{INTERPOLATION_1}} other {2+}}} other {other}}')
          ],
          placeHolders: []
        });
  });
});

describe('serializeIcuNode', () => {
  const serialize = (input: string) => {
    const tree = parse(`<div i18n>${input}</div>`);
    const rooti18n = (tree.nodes[0] as t.Element).i18n as i18n.Message;
    return serializeIcuNode(rooti18n.nodes[0] as i18n.Icu);
  };

  it('should serialize a simple ICU', () => {
    expect(serialize('{age, plural, 10 {ten} other {other}}'))
        .toEqual('{VAR_PLURAL, plural, 10 {ten} other {other}}');
  });

  it('should serialize a nested ICU', () => {
    expect(serialize(
               '{age, plural, 10 {ten {size, select, 1 {one} 2 {two} other {2+}}} other {other}}'))
        .toEqual(
            '{VAR_PLURAL, plural, 10 {ten {VAR_SELECT, select, 1 {one} 2 {two} other {2+}}} other {other}}');
  });

  it('should serialize ICU with nested HTML', () => {
    expect(serialize('{age, plural, 10 {<b>ten</b>} other {<div class="A">other</div>}}'))
        .toEqual(
            '{VAR_PLURAL, plural, 10 {{START_BOLD_TEXT}ten{CLOSE_BOLD_TEXT}} other {{START_TAG_DIV}other{CLOSE_TAG_DIV}}}');
  });

  it('should serialize an ICU with embedded interpolations', () => {
    expect(serialize('{age, select, 10 {ten} other {{{age}} years old}}'))
        .toEqual('{VAR_SELECT, select, 10 {ten} other {{INTERPOLATION} years old}}');
  });
});

function literal(text: string, span: any = jasmine.any(ParseSourceSpan)): o.LiteralPiece {
  return new o.LiteralPiece(text, span);
}

function placeholder(name: string, span: any = jasmine.any(ParseSourceSpan)): o.PlaceholderPiece {
  return new o.PlaceholderPiece(name, span);
}

function humanizeSourceSpan(span: ParseSourceSpan): string {
  return `"${span.toString()}" (${span.start.offset}-${span.end.offset})`;
}