feat(module:comment): add comment component (NG-ZORRO#2767)

* feat(module:comment): add comment component

close NG-ZORRO#2731

* test(module:comment): add test

* test(module:comment): fix test

* test(module:empty): refactor test

* test(module:empty): fix test

components/comment/demo/basic.md

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+---
+order: 0
+title:
+  zh-CN: 基本评论
+  en-US: Basic comment
+---
+
+## zh-CN
+
+一个基本的评论组件，带有作者、头像、时间和操作。
+
+## en-US
+
+A basic comment with author, avatar, time and actions.
+

components/comment/demo/basic.ts

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+import { Component } from '@angular/core';
+import { distanceInWords } from 'date-fns';
+
+@Component({
+  selector: 'nz-demo-comment-basic',
+  template: `
+    <nz-comment nzAuthor="Han Solo" [nzDatetime]="time">
+      <nz-avatar nz-comment-avatar nzIcon="user" nzSrc="//zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png"></nz-avatar>
+      <nz-comment-content>
+        <p>We supply a series of design principles, practical patterns and high quality design resources
+          (Sketch and Axure), to help people create their product prototypes beautifully and efficiently.
+        </p>
+      </nz-comment-content>
+      <nz-comment-action>
+        <i nz-tooltip nzTitle="Like" nz-icon type="like" [theme]="likes > 0 ? 'twotone' : 'outline'" (click)="like()"></i>
+        <span class="count like">{{likes}}</span>
+      </nz-comment-action>
+      <nz-comment-action>
+        <i nz-tooltip nzTitle="Dislike" nz-icon type="dislike" [theme]="dislikes > 0 ? 'twotone' : 'outline'" (click)="dislike()"></i>
+        <span class="count dislike">{{dislikes}}</span>
+      </nz-comment-action>
+      <nz-comment-action>Reply to</nz-comment-action>
+    </nz-comment>
+  `,
+  styles  : [`
+    .count {
+      padding-left: 8px;
+      cursor: auto;
+    }
+  `]
+})
+export class NzDemoCommentBasicComponent {
+  likes = 0;
+  dislikes = 0;
+  time = distanceInWords(new Date(), new Date());
+
+  like(): void {
+    this.likes = 1;
+    this.dislikes = 0;
+  }
+
+  dislike(): void {
+    this.likes = 0;
+    this.dislikes = 1;
+  }
+}

components/comment/demo/editor.md

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+---
+order: 3
+title:
+  zh-CN: 回复框
+  en-US: Reply Editor
+---
+
+## zh-CN
+
+评论编辑器组件提供了相同样式的封装以支持自定义评论编辑器。
+
+## en-US
+
+Comment can be used as editor, user can customize the editor component.

components/comment/demo/editor.ts

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+import { Component } from '@angular/core';
+import { distanceInWords } from 'date-fns';
+
+@Component({
+  selector: 'nz-demo-comment-editor',
+  template: `
+    <nz-list *ngIf="data.length" [nzDataSource]="data" [nzRenderItem]="item" [nzItemLayout]="'horizontal'">
+      <ng-template #item let-item>
+        <nz-comment [nzAuthor]="item.author" [nzDatetime]="item.displayTime">
+          <nz-avatar nz-comment-avatar nzIcon="user" [nzSrc]="item.avatar"></nz-avatar>
+          <nz-comment-content>
+            <p>{{item.content}}</p>
+          </nz-comment-content>
+        </nz-comment>
+      </ng-template>
+    </nz-list>
+    <nz-comment>
+      <nz-avatar nz-comment-avatar nzIcon="user" [nzSrc]="user.avatar"></nz-avatar>
+      <nz-comment-content>
+        <nz-form-item>
+          <textarea [(ngModel)]="inputValue" nz-input rows="4"></textarea>
+        </nz-form-item>
+        <nz-form-item>
+          <button nz-button nzType="primary" [nzLoading]="submitting" [disabled]="!inputValue" (click)="handleSubmit()">
+            Add Comment
+          </button>
+        </nz-form-item>
+      </nz-comment-content>
+    </nz-comment>
+  `,
+  styles  : []
+})
+export class NzDemoCommentEditorComponent {
+  data = [];
+  submitting = false;
+  user = {
+    author: 'Han Solo',
+    avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png'
+  };
+  inputValue = '';
+
+  handleSubmit(): void {
+    this.submitting = true;
+    const content = this.inputValue;
+    this.inputValue = '';
+    setTimeout(() => {
+      this.submitting = false;
+      this.data = [...this.data, {
+        ...this.user,
+        content,
+        datetime: new Date(),
+        displayTime: distanceInWords(new Date(), new Date())
+      }].map(e => {
+        return {
+          ...e,
+          displayTime: distanceInWords(new Date(), e.datetime)
+        };
+      });
+    }, 800);
+  }
+
+}

components/comment/demo/list.md

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+---
+order: 1
+title:
+  zh-CN: 配合列表组件
+  en-US: Usage with list
+---
+
+## zh-CN
+
+配合 `nz-list` 组件展现评论列表。
+
+## en-US
+
+Displaying a series of comments using the `nz-list` Component.

components/comment/demo/list.ts

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+import { Component } from '@angular/core';
+import { addDays, distanceInWords } from 'date-fns';
+
+@Component({
+  selector: 'nz-demo-comment-list',
+  template: `
+    <nz-list [nzDataSource]="data" [nzRenderItem]="item" [nzItemLayout]="'horizontal'">
+      <ng-template #item let-item>
+        <nz-comment [nzAuthor]="item.author" [nzDatetime]="item.datetime">
+          <nz-avatar nz-comment-avatar nzIcon="user" [nzSrc]="item.avatar"></nz-avatar>
+          <nz-comment-content>
+            <p>{{item.content}}</p>
+          </nz-comment-content>
+          <nz-comment-action>Reply to</nz-comment-action>
+        </nz-comment>
+      </ng-template>
+    </nz-list>
+  `,
+  styles  : []
+})
+export class NzDemoCommentListComponent {
+  data = [
+    {
+      author: 'Han Solo',
+      avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+      content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+        '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.',
+      datetime: distanceInWords(new Date(), addDays(new Date(), 1))
+    },
+    {
+      author: 'Han Solo',
+      avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+      content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+        '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.',
+      datetime: distanceInWords(new Date(), addDays(new Date(), 2))
+    }
+  ];
+}

components/comment/demo/nested.md

@@ -0,0 +1,15 @@
+---
+order: 2
+title:
+  zh-CN: 嵌套评论
+  en-US: Nested comments
+---
+
+## zh-CN
+
+评论可以嵌套。
+
+## en-US
+
+Comments can be nested.
+

components/comment/demo/nested.ts

@@ -0,0 +1,60 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'nz-demo-comment-nested',
+  template: `
+    <ng-template #commentTemplateRef let-comment="comment">
+      <nz-comment [nzAuthor]="comment.author">
+        <nz-avatar nz-comment-avatar nzIcon="user" [nzSrc]="comment.avatar"></nz-avatar>
+        <nz-comment-content>
+          <p>{{comment.content}}</p>
+        </nz-comment-content>
+        <nz-comment-action>Reply to</nz-comment-action>
+        <ng-container *ngIf="comment.children && comment.children.length">
+          <ng-template ngFor let-child [ngForOf]="comment.children">
+            <ng-template
+              [ngTemplateOutlet]="commentTemplateRef"
+              [ngTemplateOutletContext]="{ comment: child }">
+            </ng-template>
+          </ng-template>
+        </ng-container>
+      </nz-comment>
+    </ng-template>
+
+    <ng-template
+      [ngTemplateOutlet]="commentTemplateRef"
+      [ngTemplateOutletContext]="{ comment: data }">
+    </ng-template>
+  `,
+  styles  : []
+})
+export class NzDemoCommentNestedComponent {
+  data = {
+    author: 'Han Solo',
+    avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+    content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+      '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.',
+    children: [
+      {
+        author: 'Han Solo',
+        avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+        content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+          '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.',
+        children: [
+          {
+            author: 'Han Solo',
+            avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+            content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+              '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.'
+          },
+          {
+            author: 'Han Solo',
+            avatar: 'https://zos.alipayobjects.com/rmsportal/ODTLcjxAfvqbxHnVXCYX.png',
+            content: 'We supply a series of design principles, practical patterns and high quality design resources' +
+              '(Sketch and Axure), to help people create their product prototypes beautifully and efficiently.'
+          }
+        ]
+      }
+    ]
+  };
+}

components/comment/doc/index.en-US.md

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+---
+category: Components
+type: Data Display
+title: Comment
+cols: 1
+---
+
+A comment displays user feedback and discussion to website content.
+
+## When To Use
+
+Comments can be used to enable discussions on an entity such as a page, blog post, issue or other.
+
+## API
+
+| Property | Description | Type | Default |
+| -------- | ----------- | ---- | ------- |
+| [nzAuthor] | The element to display as the comment author | `string｜TemplateRef<void>` | - |
+| [nzDatetime] | A datetime element containing the time to be displayed | `string｜TemplateRef<void>` | - |
+
+### Comment sections
+| Element | Description |
+| ----- | ----------- |
+| `<nz-avatar nz-comment-avatar>` | The element to display as the comment avatar |
+| `<nz-comment-content>` | The main content of the comment |
+| `<nz-comment-action>` | The element items rendered below the comment content |

components/comment/doc/index.zh-CN.md

@@ -0,0 +1,27 @@
+---
+category: Components
+type: Data Display
+title: Comment
+subtitle: 评论
+cols: 1
+---
+
+对网站内容的反馈、评价和讨论。
+
+## 何时使用
+
+评论组件可用于对事物的讨论，例如页面、博客文章、问题等等。
+
+## API
+
+| Property | Description | Type | Default |
+| -------- | ----------- | ---- | ------- |
+| [nzAuthor] | 显示评论的作者 | `string｜TemplateRef<void>` | - |
+| [nzDatetime] | 展示时间描述 | `string｜TemplateRef<void>` | - |
+
+### 评论组成部分
+| 元素 | 说明 |
+| ----- | ----------- |
+| `<nz-avatar nz-comment-avatar>` | 要显示为评论头像的元素 |
+| `<nz-comment-content>` | 评论的主要内容 |
+| `<nz-comment-action>` | 在评论内容下面呈现的操作项 |

components/comment/index.ts

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+export * from './public-api';

components/comment/nz-comment-cells.ts

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+import { CdkPortalOutlet, TemplatePortal } from '@angular/cdk/portal';
+import {
+  ChangeDetectionStrategy,
+  Component, ComponentFactoryResolver,
+  Directive, Input, OnDestroy,
+  OnInit,
+  TemplateRef,
+  ViewChild,
+  ViewContainerRef, ViewEncapsulation
+} from '@angular/core';
+
+@Directive({
+  selector: 'nz-avatar[nz-comment-avatar]'
+})
+export class NzCommentAvatarDirective {
+}
+
+@Directive({
+  selector: 'nz-comment-content, [nz-comment-content]',
+  host    : { 'class': 'ant-comment-content-detail' }
+})
+export class NzCommentContentDirective {
+}
+
+@Directive({
+  selector: '[nzCommentActionHost]'
+})
+export class NzCommentActionHostDirective extends CdkPortalOutlet implements OnInit, OnDestroy {
+
+  @Input() nzCommentActionHost: TemplatePortal | null;
+
+  constructor(componentFactoryResolver: ComponentFactoryResolver,
+              viewContainerRef: ViewContainerRef) {
+    super(componentFactoryResolver, viewContainerRef);
+  }
+
+  ngOnInit(): void {
+    super.ngOnInit();
+    this.attach(this.nzCommentActionHost);
+  }
+
+  ngOnDestroy(): void {
+    super.ngOnDestroy();
+  }
+}
+
+@Component({
+  selector       : 'nz-comment-action',
+  encapsulation  : ViewEncapsulation.None,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template       : '<ng-template><ng-content></ng-content></ng-template>'
+})
+export class NzCommentActionComponent implements OnInit {
+  @ViewChild(TemplateRef) implicitContent: TemplateRef<void>;
+  private contentPortal: TemplatePortal | null = null;
+
+  get content(): TemplatePortal | null {
+    return this.contentPortal;
+  }
+
+  constructor(private viewContainerRef: ViewContainerRef) {
+
+  }
+
+  ngOnInit(): void {
+    this.contentPortal = new TemplatePortal(this.implicitContent, this.viewContainerRef);
+  }
+}