Initial editor functionality

src/app/components/components.module.ts

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+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import {HostComponent} from './editor/host/host.component';
+
+@NgModule({
+  declarations: [HostComponent],
+  imports: [
+    CommonModule
+  ],
+  entryComponents: [HostComponent],
+  exports: [
+    HostComponent
+  ]
+})
+export class ComponentsModule { }

src/app/components/editor/host/host.component.html

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+<ng-container>
+  <div
+    *ngIf="record.type === 'paragraph' || record.type === 'header1' || record.type === 'header2' || record.type === 'header3' || record.type === 'header4' || record.type === 'block_code'"
+    class="host-host ion-padding"
+    contenteditable="true"
+    (keyup)="onKeyUp($event)"
+    (blur)="record.value=hostContainer.innerText"
+    #hostContainer
+    [ngClass]="{'paragraph': record.type === 'paragraph', 'header1': record.type === 'header1', 'header2': record.type === 'header2', 'header3': record.type === 'header3', 'header4': record.type === 'header4', 'block_code': record.type === 'block_code'}"
+  >
+    {{ record.value }}
+  </div>
+</ng-container>

src/app/components/editor/host/host.component.scss

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+.host-host.header1 {
+  font-weight: bold;
+  font-size: 24pt;
+}
+
+.host-host.header2 {
+  font-weight: bold;
+  font-size: 21pt;
+}
+
+.host-host.header3 {
+  font-weight: bold;
+  font-size: 18pt;
+}
+
+.host-host.header4 {
+  font-weight: bold;
+  font-size: 16pt;
+}
+
+.host-host.block_code {
+  font-family: monospace;
+  font-size: 12pt;
+  background-color: #ddd;
+  margin-bottom: 15px;
+}

src/app/components/editor/host/host.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { IonicModule } from '@ionic/angular';
+
+import { HostComponent } from './host.component';
+
+describe('HostComponent', () => {
+  let component: HostComponent;
+  let fixture: ComponentFixture<HostComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ HostComponent ],
+      imports: [IonicModule.forRoot()]
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(HostComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  }));
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/editor/host/host.component.ts

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+import {Component, ElementRef, EventEmitter, Input, OnInit, Output, ViewChild} from '@angular/core';
+import HostRecord from '../../../structures/HostRecord';
+
+@Component({
+  selector: 'editor-host',
+  templateUrl: './host.component.html',
+  styleUrls: ['./host.component.scss'],
+})
+export class HostComponent implements OnInit {
+  @Input() record: HostRecord;
+  @Output() recordChange = new EventEmitter<HostRecord>();
+  @Output() newHostRequested = new EventEmitter<HostComponent>();
+  @Output() destroyHostRequested = new EventEmitter<HostComponent>();
+  @ViewChild('hostContainer', {static: false}) hostContainer: ElementRef;
+
+  constructor() { }
+
+  ngOnInit() {}
+
+  onKeyUp($event) {
+    const innerText = this.hostContainer.nativeElement.innerText.trim()
+    if ( $event.code === 'Enter'
+        && ( this.record.type !== 'block_code'
+        || (innerText.endsWith('```') && (innerText.match(/`/g) || []).length >= 6)
+        )
+    ) {
+      this.newHostRequested.emit(this);
+      this.hostContainer.nativeElement.innerText = this.hostContainer.nativeElement.innerText.trim();
+    } else if ( $event.code === 'Backspace' && !this.hostContainer.nativeElement.innerText.trim() ) {
+      this.destroyHostRequested.emit(this);
+    }
+
+    if ( innerText.startsWith('# ') ) {
+      this.record.type = 'header1';
+    } else if ( innerText.startsWith('## ') ) {
+      this.record.type = 'header2';
+    } else if ( innerText.startsWith('### ') ) {
+      this.record.type = 'header3';
+    } else if ( innerText.startsWith('#### ') ) {
+      this.record.type = 'header4';
+    } else if ( innerText.startsWith('```') ) {
+      this.record.type = 'block_code';
+    } else {
+      this.record.type = 'paragraph';
+    }
+  }
+
+}

src/app/components/editor/paragraph/paragraph.component.html

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+<p>
+  paragraph works!
+</p>

src/app/components/editor/paragraph/paragraph.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { IonicModule } from '@ionic/angular';
+
+import { ParagraphComponent } from './paragraph.component';
+
+describe('ParagraphComponent', () => {
+  let component: ParagraphComponent;
+  let fixture: ComponentFixture<ParagraphComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ ParagraphComponent ],
+      imports: [IonicModule.forRoot()]
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(ParagraphComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  }));
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/editor/paragraph/paragraph.component.ts

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+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-paragraph',
+  templateUrl: './paragraph.component.html',
+  styleUrls: ['./paragraph.component.scss'],
+})
+export class ParagraphComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit() {}
+
+}