perf: 优化超长文本信息

2024-12-13 15:45:20 +08:00
parent 9e92c61fbf
commit 49aa1434aa
12 changed files with 227 additions and 18 deletions
--- a/app/Module/MsgTool.php
+++ b/app/Module/MsgTool.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace App\Module;
+
+
+use DOMDocument;
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Exception\CommonMarkException;
+use League\HTMLToMarkdown\HtmlConverter;
+
+class MsgTool
+{
+    /**
+     * 截取文本并保持标签完整性
+     *
+     * @param string $text 要截取的文本
+     * @param int $length 截取长度
+     * @param string $type 文本类型 (htm 或 md)
+     * @return string 处理后的文本
+     */
+    public static function truncateText($text, $length, $type = 'htm')
+    {
+        if (empty($text) || mb_strlen($text) <= $length) {
+            return $text;
+        }
+
+        $isMd = strtolower($type) === 'md';
+
+        // 如果是Markdown，转换为HTML
+        if ($isMd) {
+            $converter = new CommonMarkConverter();
+            try {
+                $text = $converter->convert($text);
+            } catch (CommonMarkException) {
+                return "";
+            }
+        }
+
+        // 创建DOM文档
+        $dom = new DOMDocument('1.0', 'UTF-8');
+        libxml_use_internal_errors(true);
+        $dom->loadHTML(mb_convert_encoding($text, 'HTML-ENTITIES', 'UTF-8'));
+        libxml_clear_errors();
+
+        // 获取body元素
+        $body = $dom->getElementsByTagName('body')->item(0);
+        $truncatedHtml = '';
+        $currentLength = 0;
+
+        // 递归函数来遍历节点并截取内容
+        self::traverseNodes($body, $currentLength, $length, $truncatedHtml);
+
+        // 如果是Markdown，转换回Markdown
+        if ($isMd) {
+            $converter = new HtmlConverter();
+            $truncatedHtml = $converter->convert($truncatedHtml);
+        }
+
+        return $truncatedHtml;
+    }
+
+    /**
+     * 递归遍历节点
+     * @param $node
+     * @param $currentLength
+     * @param $length
+     * @param $truncatedHtml
+     * @return void
+     */
+    private static function traverseNodes($node, &$currentLength, $length, &$truncatedHtml)
+    {
+        foreach ($node->childNodes as $child) {
+            if ($currentLength >= $length) {
+                break;
+            }
+
+            if ($child->nodeType === XML_TEXT_NODE) {
+                $textContent = $child->textContent;
+                $remainingLength = $length - $currentLength;
+
+                if (mb_strlen($textContent) > $remainingLength) {
+                    $truncatedHtml .= htmlspecialchars(mb_substr($textContent, 0, $remainingLength) . '...');
+                    $currentLength += $remainingLength;
+                } else {
+                    $truncatedHtml .= htmlspecialchars($textContent);
+                    $currentLength += mb_strlen($textContent);
+                }
+            } elseif ($child->nodeType === XML_ELEMENT_NODE) {
+                $truncatedHtml .= '<' . $child->nodeName;
+
+                // 添加属性
+                if ($child->hasAttributes()) {
+                    foreach ($child->attributes as $attr) {
+                        $truncatedHtml .= ' ' . $attr->nodeName . '="' . htmlspecialchars($attr->nodeValue) . '"';
+                    }
+                }
+
+                $truncatedHtml .= '>';
+
+                self::traverseNodes($child, $currentLength, $length, $truncatedHtml);
+
+                if ($currentLength < $length || $child->firstChild) {
+                    $truncatedHtml .= '</' . $child->nodeName . '>';
+                }
+            }
+        }
+    }
+}