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/**
* Quản lý token counting và chunking
*/
class TokenManager {
constructor(options = {}) {
this.options = {
model: options.model || 'gpt-4',
maxTokens: options.maxTokens || 8000,
chunkOverlap: options.chunkOverlap || 200,
preserveStructure: options.preserveStructure !== false,
...options
};
this.encoding = null;
this.initializeEncoding();
}
/**
* Khởi tạo encoding
*/
initializeEncoding() {
try {
// Thử sử dụng encoding cho model cụ thể
this.encoding = encoding_for_model(this.options.model);
} catch (error) {
try {
// Fallback to cl100k_base (GPT-4, GPT-3.5-turbo)
this.encoding = get_encoding('cl100k_base');
} catch (fallbackError) {
// Fallback to p50k_base (GPT-3)
this.encoding = get_encoding('p50k_base');
}
}
}
/**
* Đếm tokens trong text
*/
countTokens(text) {
Iif (!text || typeof text !== 'string') {
return 0;
}
try {
const tokens = this.encoding.encode(text);
return tokens.length;
} catch (error) {
// Fallback: estimate based on characters (rough approximation)
return Math.ceil(text.length / 4);
}
}
/**
* Phân tích token usage cho một file
*/
analyzeFile(file) {
const headerTokens = this.countTokens(this.generateFileHeader(file));
const contentTokens = this.countTokens(file.content);
const totalTokens = headerTokens + contentTokens;
return {
file: file.relativePath,
headerTokens,
contentTokens,
totalTokens,
exceedsLimit: totalTokens > this.options.maxTokens,
chunksNeeded: Math.ceil(totalTokens / this.options.maxTokens)
};
}
/**
* Phân tích token usage cho tất cả files
*/
analyzeFiles(files) {
const analyses = files.map(file => this.analyzeFile(file));
const totalTokens = analyses.reduce((sum, analysis) => sum + analysis.totalTokens, 0);
const filesExceedingLimit = analyses.filter(analysis => analysis.exceedsLimit);
const totalChunks = analyses.reduce((sum, analysis) => sum + analysis.chunksNeeded, 0);
return {
files: analyses,
summary: {
totalFiles: files.length,
totalTokens,
averageTokensPerFile: Math.round(totalTokens / files.length),
filesExceedingLimit: filesExceedingLimit.length,
totalChunks,
estimatedChunks: Math.ceil(totalTokens / this.options.maxTokens)
}
};
}
/**
* Chia nhỏ content thành chunks
*/
async chunkContent(content, metadata = {}) {
const totalTokens = this.countTokens(content);
Iif (totalTokens <= this.options.maxTokens) {
return [{
content,
tokens: totalTokens,
chunkIndex: 0,
totalChunks: 1,
metadata
}];
}
return this.options.preserveStructure
? await this.chunkByStructure(content, metadata)
: await this.chunkByTokens(content, metadata);
}
/**
* Chia nhỏ theo cấu trúc (ưu tiên giữ nguyên files)
*/
async chunkByStructure(content, metadata = {}) {
const chunks = [];
const lines = content.split('\n');
let currentChunk = '';
let currentTokens = 0;
let chunkIndex = 0;
// Tìm file boundaries
const fileBoundaries = this.findFileBoundaries(lines);
for (let i = 0; i < fileBoundaries.length; i++) {
const boundary = fileBoundaries[i];
const fileContent = lines.slice(boundary.start, boundary.end).join('\n');
const fileTokens = this.countTokens(fileContent);
// Nếu file này làm chunk vượt quá limit
if (currentTokens + fileTokens > this.options.maxTokens && currentChunk) {
// Lưu chunk hiện tại
chunks.push({
content: currentChunk.trim(),
tokens: currentTokens,
chunkIndex: chunkIndex++,
totalChunks: 0, // Sẽ update sau
metadata: { ...metadata, type: 'structure' }
});
currentChunk = '';
currentTokens = 0;
}
// Nếu file quá lớn, chia nhỏ file này
if (fileTokens > this.options.maxTokens) {
const fileChunks = await this.chunkLargeFile(fileContent, boundary.filePath);
chunks.push(...fileChunks.map(chunk => ({
...chunk,
chunkIndex: chunkIndex++,
metadata: { ...metadata, ...chunk.metadata, type: 'large-file' }
})));
} else {
currentChunk += fileContent + '\n';
currentTokens += fileTokens;
}
}
// Thêm chunk cuối cùng
Eif (currentChunk.trim()) {
chunks.push({
content: currentChunk.trim(),
tokens: currentTokens,
chunkIndex: chunkIndex++,
totalChunks: 0,
metadata: { ...metadata, type: 'structure' }
});
}
// Update totalChunks
chunks.forEach(chunk => {
chunk.totalChunks = chunks.length;
});
return chunks;
}
/**
* Chia nhỏ theo tokens (simple splitting)
*/
async chunkByTokens(content, metadata = {}) {
const chunks = [];
const lines = content.split('\n');
let currentChunk = '';
let currentTokens = 0;
let chunkIndex = 0;
for (const line of lines) {
const lineTokens = this.countTokens(line + '\n');
if (currentTokens + lineTokens > this.options.maxTokens && currentChunk) {
// Lưu chunk hiện tại
chunks.push({
content: currentChunk.trim(),
tokens: currentTokens,
chunkIndex: chunkIndex++,
totalChunks: 0,
metadata: { ...metadata, type: 'token-based' }
});
// Bắt đầu chunk mới với overlap
if (this.options.chunkOverlap > 0) {
const overlapLines = this.getOverlapLines(currentChunk, this.options.chunkOverlap);
currentChunk = overlapLines;
currentTokens = this.countTokens(overlapLines);
} else {
currentChunk = '';
currentTokens = 0;
}
}
currentChunk += line + '\n';
currentTokens += lineTokens;
}
// Thêm chunk cuối cùng
if (currentChunk.trim()) {
chunks.push({
content: currentChunk.trim(),
tokens: currentTokens,
chunkIndex: chunkIndex++,
totalChunks: 0,
metadata: { ...metadata, type: 'token-based' }
});
}
// Update totalChunks
chunks.forEach(chunk => {
chunk.totalChunks = chunks.length;
});
return chunks;
}
/**
* Chia nhỏ file lớn
*/
async chunkLargeFile(fileContent, filePath) {
const lines = fileContent.split('\n');
const chunks = [];
let currentChunk = '';
let currentTokens = 0;
let chunkIndex = 0;
// Thêm header cho file
const header = `\n=== Large File: ${filePath} (Part {part}) ===\n`;
for (const line of lines) {
const lineTokens = this.countTokens(line + '\n');
if (currentTokens + lineTokens > this.options.maxTokens - 100 && currentChunk) { // Reserve 100 tokens for header
const partHeader = header.replace('{part}', (chunkIndex + 1).toString());
chunks.push({
content: partHeader + currentChunk.trim(),
tokens: this.countTokens(partHeader + currentChunk.trim()),
chunkIndex: chunkIndex++,
totalChunks: 0,
metadata: {
filePath,
partNumber: chunkIndex + 1,
type: 'large-file-part'
}
});
currentChunk = '';
currentTokens = 0;
}
currentChunk += line + '\n';
currentTokens += lineTokens;
}
// Thêm chunk cuối cùng
Eif (currentChunk.trim()) {
const partHeader = header.replace('{part}', (chunkIndex + 1).toString());
chunks.push({
content: partHeader + currentChunk.trim(),
tokens: this.countTokens(partHeader + currentChunk.trim()),
chunkIndex: chunkIndex++,
totalChunks: 0,
metadata: {
filePath,
partNumber: chunkIndex + 1,
type: 'large-file-part'
}
});
}
// Update totalChunks
chunks.forEach(chunk => {
chunk.totalChunks = chunks.length;
});
return chunks;
}
/**
* Tìm file boundaries trong content
*/
findFileBoundaries(lines) {
const boundaries = [];
let currentStart = 0;
let currentFilePath = null;
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
// Tìm file header pattern
if (line.includes('================================================================================')) {
if (i + 1 < lines.length && lines[i + 1].startsWith('File: ')) {
// Lưu boundary trước đó
if (currentFilePath) {
boundaries.push({
start: currentStart,
end: i,
filePath: currentFilePath
});
}
// Bắt đầu file mới
currentStart = i;
currentFilePath = lines[i + 1].replace('File: ', '').trim();
}
}
}
// Thêm boundary cuối cùng
Eif (currentFilePath) {
boundaries.push({
start: currentStart,
end: lines.length,
filePath: currentFilePath
});
}
return boundaries;
}
/**
* Lấy overlap lines
*/
getOverlapLines(content, maxTokens) {
const lines = content.split('\n');
let overlapContent = '';
let tokens = 0;
// Lấy từ cuối lên
for (let i = lines.length - 1; i >= 0; i--) {
const line = lines[i] + '\n';
const lineTokens = this.countTokens(line);
if (tokens + lineTokens > maxTokens) {
break;
}
overlapContent = line + overlapContent;
tokens += lineTokens;
}
return overlapContent;
}
/**
* Tạo file header
*/
generateFileHeader(file) {
return `
================================================================================
File: ${file.relativePath}
Size: ${file.size} bytes | Lines: ${file.lines}
================================================================================`;
}
/**
* Cleanup encoding
*/
cleanup() {
Eif (this.encoding) {
this.encoding.free();
}
}
}
module.exports = TokenManager;
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