Convert serialize and deserialize to TypeScript

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/editor/serialize.ts

@@ -0,0 +1,99 @@
+/*
+Copyright 2019 New Vector Ltd
+Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import Markdown from '../Markdown';
+import {makeGenericPermalink} from "../utils/permalinks/Permalinks";
+import EditorModel from "./model";
+
+export function mdSerialize(model: EditorModel) {
+    return model.parts.reduce((html, part) => {
+        switch (part.type) {
+            case "newline":
+                return html + "\n";
+            case "plain":
+            case "command":
+            case "pill-candidate":
+            case "at-room-pill":
+                return html + part.text;
+            case "room-pill":
+            case "user-pill":
+                return html + `[${part.text.replace(/[\\\]]/, c => "\\" + c)}](${makeGenericPermalink(part.resourceId)})`;
+        }
+    }, "");
+}
+
+export function htmlSerializeIfNeeded(model: EditorModel, {forceHTML = false} = {}) {
+    const md = mdSerialize(model);
+    const parser = new Markdown(md);
+    if (!parser.isPlainText() || forceHTML) {
+        return parser.toHTML();
+    }
+}
+
+export function textSerialize(model: EditorModel) {
+    return model.parts.reduce((text, part) => {
+        switch (part.type) {
+            case "newline":
+                return text + "\n";
+            case "plain":
+            case "command":
+            case "pill-candidate":
+            case "at-room-pill":
+                return text + part.text;
+            case "room-pill":
+            case "user-pill":
+                return text + `${part.text}`;
+        }
+    }, "");
+}
+
+export function containsEmote(model: EditorModel) {
+    return startsWith(model, "/me ");
+}
+
+export function startsWith(model: EditorModel, prefix: string) {
+    const firstPart = model.parts[0];
+    // part type will be "plain" while editing,
+    // and "command" while composing a message.
+    return firstPart &&
+        (firstPart.type === "plain" || firstPart.type === "command") &&
+        firstPart.text.startsWith(prefix);
+}
+
+export function stripEmoteCommand(model: EditorModel) {
+    // trim "/me "
+    return stripPrefix(model, "/me ");
+}
+
+export function stripPrefix(model: EditorModel, prefix: string) {
+    model = model.clone();
+    model.removeText({index: 0, offset: 0}, prefix.length);
+    return model;
+}
+
+export function unescapeMessage(model: EditorModel) {
+    const {parts} = model;
+    if (parts.length) {
+        const firstPart = parts[0];
+        // only unescape \/ to / at start of editor
+        if (firstPart.type === "plain" && firstPart.text.startsWith("\\/")) {
+            model = model.clone();
+            model.removeText({index: 0, offset: 0}, 1);
+        }
+    }
+    return model;
+}