71 lines
2.3 KiB
TypeScript
71 lines
2.3 KiB
TypeScript
/*
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Copyright 2020 mx-puppet-xmpp
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import * as Parser from "node-html-parser";
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import * as escapeHtml from "escape-html";
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export class MatrixMessageParser {
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public parse(msg: string): string {
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const nodes = Parser.parse(`<wrap>${msg}</wrap>`, {
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lowerCaseTagName: true,
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pre: true,
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});
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return this.walkNode(nodes);
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}
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private walkChildNodes(node: Parser.Node): string {
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return node.childNodes.map((n) => this.walkNode(n)).join("");
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}
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private escape(s: string): string {
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return s;
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}
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private walkNode(node: Parser.Node): string {
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if (node.nodeType === Parser.NodeType.TEXT_NODE) {
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return this.escape((node as Parser.TextNode).text);
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} else if (node.nodeType === Parser.NodeType.ELEMENT_NODE) {
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const nodeHtml = node as Parser.HTMLElement;
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switch (nodeHtml.tagName) {
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case "em":
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case "i":
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return `<i raw_pre="_" raw_post="_">${this.walkChildNodes(nodeHtml)}</i>`;
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case "strong":
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case "b":
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return `<b raw_pre="*" raw_post="*">${this.walkChildNodes(nodeHtml)}</b>`;
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case "del":
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return `<s raw_pre="~" raw_post="~">${this.walkChildNodes(nodeHtml)}</s>`;
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case "code":
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return `<pre raw_pre="{code}" raw_post="{code}">${this.walkChildNodes(nodeHtml)}</pre>`;
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case "a": {
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const href = nodeHtml.attributes.href;
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const inner = this.walkChildNodes(nodeHtml);
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return `<a href="${escapeHtml(href)}">${inner}</a>`;
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}
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case "blockquote":
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return `<quote>${this.walkChildNodes(nodeHtml)}</quote>`;
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case "wrap":
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return this.walkChildNodes(nodeHtml);
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case "mx-reply": // disgard replies
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return "";
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default:
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if (!nodeHtml.tagName) {
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return this.walkChildNodes(nodeHtml);
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}
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return `<${nodeHtml.tagName}>${this.walkChildNodes(nodeHtml)}</${nodeHtml.tagName}>`;
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}
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}
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return "";
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}
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}
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