src/tools/WebFetchTool/UI.tsx

/* TUI/CLI 中渲染 Web 工具调用过程的 UI 组件集合, 基于 React(类似于Ink的终端 React 框架)
 * 显示
 * 「工具调用参数」
 * 「工具执行中」状态
 * 「工具返回结果」
 * 本质
 * 「Tool UI Renderer」工具可视化层
  */
import React from 'react';
import { MessageResponse } from '../../components/MessageResponse.js'; // UI 组件: 用来包裹一条“消息" (类似聊天气泡)
import { TOOL_SUMMARY_MAX_LENGTH } from '../../constants/toolLimits.js'; // 常量: 工具摘要最大长度
import { Box, Text } from '../../ink.js'; // Box: 布局(类似 div), Text: 文本, 来自 Ink (终端版React)
import type { ToolProgressData } from '../../Tool.js'; // 工具执行过程中的数据结构, TypeScript 类型 (仅类型, 不参与运行)
import type { ProgressMessage } from '../../types/message.js'; // 类型: 进度消息 
import { formatFileSize, truncate } from '../../utils/format.js'; // 工具函数: 字节 -> 可读大小 (KB/MB), truncate 截断字符串
import type { Output } from './WebFetchTool.js'; // Web 工具返回结果的类型

// 工具调用的时候 - 渲染工具使用的消息
export function renderToolUseMessage({
  url, // 要访问的 网址
  prompt // 附带提示词
}: Partial<{ // 意味着这两个字段可以没有
  url: string;
  prompt: string;
}>, {
  verbose // 是否详细模式
}: {
  theme?: string; // 没有用到
  verbose: boolean;
}): React.ReactNode { // 返回值 是 React 节点(可以是字符串/JSX)
  if (!url) {
    return null; // 如果没有 url 不渲染任何内容
  }
  if (verbose) { // 如果是详细模式 返回字符串
    // `url: "${url}"` 一定有
    /* verbose && prompt ? `, prompt: "${prompt}"` : ''
     * 如果 verbose = True, 且 prompt 存在, 就追加 , prompt: ""
      */
    return `url: "${url}"${verbose && prompt ? `, prompt: "${prompt}"` : ''}`;
  }
  // 非 verbose 模式只返回 url
  return url;
}

// 工具执行中的时候 - 渲染工具使用过程中的消息
export function renderToolUseProgressMessage(
  // 无参数函数
): React.ReactNode {
  return <MessageResponse height={1}>
            <Text dimColor>Fetching…</Text>
         </MessageResponse>; // 渲染一个消息容器, 高度 1 行, 显示灰色文本, 最后结束组件
}

// 渲染工具结果的消息
export function renderToolResultMessage({
  bytes, // 数据大小
  code, // HTTP 状态码 eg: 200
  codeText, // 状态描述 eg: OK
  result // 内容
}: Output,
  _progressMessagesForMessage: ProgressMessage<ToolProgressData>[], // 进度消息列表, 变量名前有 _, 表示没用到的占位符 
{
  verbose
}: {
  verbose: boolean; // 是否详细模式
}): React.ReactNode { // 返回 React 节点
  const formattedSize = formatFileSize(bytes);
  if (verbose) {
    return <Box flexDirection="column">
        <MessageResponse height={1}>
          <Text>
            Received <Text bold>{formattedSize}</Text> ({code} {codeText})
          </Text>
        </MessageResponse>
        <Box flexDirection="column">
          <Text>{result}</Text>
        </Box>
      </Box>;
  }
  return <MessageResponse height={1}>
      <Text>
        Received <Text bold>{formattedSize}</Text> ({code} {codeText})
      </Text>
    </MessageResponse>;
}
export function getToolUseSummary(input: Partial<{
  url: string;
  prompt: string;
}> | undefined): string | null {
  if (!input?.url) {
    return null;
  }
  return truncate(input.url, TOOL_SUMMARY_MAX_LENGTH);
}
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