/**
* 文件比较工具模块
* 支持比较两个文件的差异
*/
const fs = require('fs').promises;
const crypto = require('crypto');
class FileCompareTool {
constructor(securityValidator) {
this.securityValidator = securityValidator;
}
async handle(args) {
const { file1, file2, source_path, target_path, output_format = 'text' } = args;
const left = file1 || source_path;
const right = file2 || target_path;
if (!left || !right) throw new Error('缺少文件参数: 需要 file1/file2 或 source_path/target_path');
// 检查路径是否被允许
if (!this.securityValidator.isPathAllowed(left) || !this.securityValidator.isPathAllowed(right)) {
throw new Error('不允许比较指定路径的文件');
}
try {
const [content1, content2] = await Promise.all([
fs.readFile(left, 'utf8'),
fs.readFile(right, 'utf8')
]);
const comparison = this.compareContents(content1, content2, left, right);
const stats = this.diffStats(comparison.differences);
const payload = { ...comparison, diff_stats: stats };
if (output_format === 'json') {
return { content: [{ type: 'json', json: payload }] };
} else if (output_format === 'both') {
return { content: [
{ type: 'text', text: this.formatTextComparison(payload) },
{ type: 'json', json: payload }
]};
}
return { content: [{ type: 'text', text: this.formatTextComparison(payload) }] };
} catch (error) {
if (error.code === 'ENOENT') {
throw new Error(`文件不存在: ${error.path}`);
} else if (error.code === 'EACCES') {
throw new Error(`没有权限读取文件: ${error.path}`);
} else {
throw new Error(`比较文件失败: ${error.message}`);
}
}
}
compareContents(content1, content2, file1, file2) {
const lines1 = content1.split('\n');
const lines2 = content2.split('\n');
const maxLines = Math.max(lines1.length, lines2.length);
const differences = [];
for (let i = 0; i < maxLines; i++) {
const line1 = lines1[i] || '';
const line2 = lines2[i] || '';
if (line1 !== line2) {
differences.push({
line: i + 1,
file1_content: line1,
file2_content: line2,
type: line1 === '' ? 'added' : line2 === '' ? 'removed' : 'modified'
});
}
}
// 计算文件哈希
const hash1 = crypto.createHash('md5').update(content1).digest('hex');
const hash2 = crypto.createHash('md5').update(content2).digest('hex');
return {
files: {
file1: file1,
file2: file2
},
identical: differences.length === 0,
total_lines: {
file1: lines1.length,
file2: lines2.length
},
differences_count: differences.length,
differences: differences,
hashes: {
file1: hash1,
file2: hash2
}
};
}
formatTextComparison(comparison) {
let result = `文件比较结果:\n`;
result += `文件1: ${comparison.files.file1}\n`;
result += `文件2: ${comparison.files.file2}\n`;
result += `行数: ${comparison.total_lines.file1} vs ${comparison.total_lines.file2}\n`;
result += `差异数量: ${comparison.differences_count}\n`;
result += `是否相同: ${comparison.identical ? '是' : '否'}\n\n`;
if (comparison.differences_count > 0) {
result += `差异详情:\n`;
result += `${'='.repeat(60)}\n`;
comparison.differences.forEach(diff => {
result += `行 ${diff.line}:\n`;
result += ` 文件1: ${diff.file1_content}\n`;
result += ` 文件2: ${diff.file2_content}\n`;
result += ` 类型: ${diff.type}\n`;
result += `${'-'.repeat(40)}\n`;
});
}
return result;
}
diffStats(differences) {
const stats = { added: 0, removed: 0, modified: 0 };
for (const d of differences) {
if (d.type === 'added') stats.added++;
else if (d.type === 'removed') stats.removed++;
else if (d.type === 'modified') stats.modified++;
}
return stats;
}
}
module.exports = FileCompareTool;
