Remove all usages of slate in favour of CIDER

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

src/autocomplete/PlainWithPillsSerializer.js

@@ -1,92 +0,0 @@
-/*
-Copyright 2018 New Vector Ltd
-
-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.
-*/
-
-// Based originally on slate-plain-serializer
-
-import { Block } from 'slate';
-
-/**
- * Plain text serializer, which converts a Slate `value` to a plain text string,
- * serializing pills into various different formats as required.
- *
- * @type {PlainWithPillsSerializer}
- */
-
-class PlainWithPillsSerializer {
-    /*
-     * @param {String} options.pillFormat - either 'md', 'plain', 'id'
-     */
-    constructor(options = {}) {
-        const {
-            pillFormat = 'plain',
-        } = options;
-        this.pillFormat = pillFormat;
-    }
-
-    /**
-     * Serialize a Slate `value` to a plain text string,
-     * serializing pills as either MD links, plain text representations or
-     * ID representations as required.
-     *
-     * @param {Value} value
-     * @return {String}
-     */
-    serialize = value => {
-        return this._serializeNode(value.document);
-    }
-
-    /**
-     * Serialize a `node` to plain text.
-     *
-     * @param {Node} node
-     * @return {String}
-     */
-    _serializeNode = node => {
-        if (
-            node.object == 'document' ||
-            (node.object == 'block' && Block.isBlockList(node.nodes))
-        ) {
-            return node.nodes.map(this._serializeNode).join('\n');
-        } else if (node.type == 'emoji') {
-            return node.data.get('emojiUnicode');
-        } else if (node.type == 'pill') {
-            const completion = node.data.get('completion');
-            // over the wire the @room pill is just plaintext
-            if (completion === '@room') return completion;
-
-            switch (this.pillFormat) {
-                case 'plain':
-                    return completion;
-                case 'md':
-                    return `[${ completion }](${ node.data.get('href') })`;
-                case 'id':
-                    return node.data.get('completionId') || completion;
-            }
-        } else if (node.nodes) {
-            return node.nodes.map(this._serializeNode).join('');
-        } else {
-            return node.text;
-        }
-    }
-}
-
-/**
- * Export.
- *
- * @type {PlainWithPillsSerializer}
- */
-
-export default PlainWithPillsSerializer;