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import { type ToolInvocation, type UIMessage } from 'ai';
import { type AbsolutePath, getAbsolutePath } from './utils/workDir.js';
import { type Dirent, type EditorDocument, type FileMap } from './types.js';
import { PREWARM_PATHS, WORK_DIR } from './constants.js';
import { renderFile } from './utils/renderFile.js';
import { StreamingMessageParser } from './message-parser.js';
import { makePartId, type PartId } from './partId.js';
import { viewParameters } from './tools/view.js';
import { editToolParameters } from './tools/edit.js';
import { loggingSafeParse } from './utils/zodUtil.js';
import { npmInstallToolParameters } from './tools/npmInstall.js';
import { path } from './utils/path.js';
const MAX_RELEVANT_FILES = 16;
type UIMessagePart = UIMessage['parts'][number];
export type PromptCharacterCounts = {
messageHistoryChars: number;
currentTurnChars: number;
totalPromptChars: number;
};
type ParsedAssistantMessage = {
filesTouched: Map<AbsolutePath, number>;
};
export class ChatContextManager {
assistantMessageCache: WeakMap<UIMessage, ParsedAssistantMessage> = new WeakMap();
messageSizeCache: WeakMap<UIMessage, number> = new WeakMap();
partSizeCache: WeakMap<UIMessagePart, number> = new WeakMap();
messageIndex: number = -1;
partIndex: number = -1;
constructor(
private getCurrentDocument: () => EditorDocument | undefined,
private getFiles: () => FileMap,
private getUserWrites: () => Map<AbsolutePath, number>,
) { }
/**
* Reset the context manager state. This should be called when switching
* between subchats to prevent stale message indices from causing errors.
*/
reset(): void {
this.assistantMessageCache = new WeakMap();
this.messageSizeCache = new WeakMap();
this.partSizeCache = new WeakMap();
this.messageIndex = -1;
this.partIndex = -1;
}
/**
* Our request context has a few sections:
*
* 1. The CodinIT guidelines, which are filled in by the server and
* set to be cached by Anthropic (~15k tokens).
* 2. Some relevant project files, which are filled in from the file
* cache based on LRU, up to maxRelevantFilesSize.
* 3. A potentially collapsed segment of the chat history followed
* by the full fidelity recent chat history, up to maxCollapsedMessagesSize.
*/
prepareContext(
messages: UIMessage[],
maxCollapsedMessagesSize: number,
minCollapsedMessagesSize: number,
): { messages: UIMessage[]; collapsedMessages: boolean; promptCharacterCounts?: PromptCharacterCounts } {
// If the last message is a user message this is the first LLM call that includes that user message.
// Only update the relevant files and the message cutoff indices if the last message is a user message to avoid clearing the cache as the agent makes changes.
let collapsedMessages = false;
if (messages[messages.length - 1].role === 'user') {
const [messageIndex, partIndex] = this.messagePartCutoff(messages, maxCollapsedMessagesSize);
if (messageIndex == this.messageIndex && partIndex == this.partIndex) {
return { messages, collapsedMessages };
}
if (messageIndex >= this.messageIndex && partIndex >= this.partIndex) {
// Truncate more than just the `maxCollapsedMessagesSize` limit because we want to get some cache hits before needing to truncate again.
// If we only truncate to the `maxCollapsedMessagesSize` limit, we'll keep truncating on each new message, which means cache misses.
const [newMessageIndex, newPartIndex] = this.messagePartCutoff(messages, minCollapsedMessagesSize);
this.messageIndex = newMessageIndex;
this.partIndex = newPartIndex;
collapsedMessages = true;
}
}
messages = this.collapseMessages(messages);
return { messages, collapsedMessages };
}
/**
* Calculate character counts for different parts of the prompt
*/
calculatePromptCharacterCounts(messages: UIMessage[], systemPrompts?: string[]): PromptCharacterCounts {
// Calculate message history character count (excluding current turn)
let messageHistoryChars = 0;
const lastMessage = messages[messages.length - 1];
const isLastMessageUser = lastMessage?.role === 'user';
for (let i = 0; i < messages.length; i++) {
const message = messages[i];
// Skip the current turn (last message if it's from user)
if (isLastMessageUser && i === messages.length - 1) {
continue;
}
messageHistoryChars += this.messageSize(message);
}
// Calculate current turn character count
let currentTurnChars = 0;
if (isLastMessageUser) {
currentTurnChars = this.messageSize(lastMessage);
}
// Calculate system prompts character count (if provided)
let systemPromptsChars = 0;
if (systemPrompts) {
systemPromptsChars = systemPrompts.reduce((sum, prompt) => sum + prompt.length, 0);
}
const totalPromptChars = messageHistoryChars + currentTurnChars + systemPromptsChars;
return {
messageHistoryChars,
currentTurnChars,
totalPromptChars,
};
}
private messageSize(message: UIMessage): number {
const cached = this.messageSizeCache.get(message);
if (cached !== undefined) {
return cached;
}
let size = message.content.length;
for (const part of message.parts) {
size += this.partSize(part);
}
this.messageSizeCache.set(message, size);
return size;
}
relevantFiles(messages: UIMessage[], id: string, maxRelevantFilesSize: number): UIMessage {
const currentDocument = this.getCurrentDocument();
const cache = this.getFiles();
const allPaths = Object.keys(cache).sort();
const lastUsed: Map<AbsolutePath, number> = new Map();
for (const path of PREWARM_PATHS) {
const absPath = path as AbsolutePath;
const entry = cache[absPath];
if (!entry) {
continue;
}
lastUsed.set(absPath, 0);
}
let partCounter = 0;
for (const message of messages) {
const createdAt = message.createdAt?.getTime();
const parsed = this.parsedAssistantMessage(message);
if (!parsed) {
continue;
}
for (const [absPath, partIndex] of parsed.filesTouched.entries()) {
const entry = cache[absPath];
if (!entry || entry.type !== 'file') {
continue;
}
const lastUsedTime = (createdAt ?? partCounter) + partIndex;
lastUsed.set(absPath, lastUsedTime);
}
partCounter += message.parts.length;
}
for (const [path, lastUsedTime] of this.getUserWrites().entries()) {
const existing = lastUsed.get(path) ?? 0;
lastUsed.set(path, Math.max(existing, lastUsedTime));
}
if (currentDocument) {
lastUsed.delete(currentDocument.filePath);
}
const sortedByLastUsed = Array.from(lastUsed.entries()).sort((a, b) => b[1] - a[1]);
let sizeEstimate = 0;
const fileActions: string[] = [];
let numFiles = 0;
for (const [path] of sortedByLastUsed) {
if (sizeEstimate > maxRelevantFilesSize) {
break;
}
if (numFiles >= MAX_RELEVANT_FILES) {
break;
}
const entry = cache[path];
if (!entry) {
continue;
}
if (entry.type === 'file') {
const content = renderFile(entry.content);
fileActions.push(`<codinitAction type="file" filePath="${path}">${content}</codinitAction>`);
const size = estimateSize(entry);
sizeEstimate += size;
numFiles++;
}
}
if (currentDocument) {
const content = renderFile(currentDocument.value);
fileActions.push(`<codinitAction type="file" filePath="${currentDocument.filePath}">${content}</codinitAction>`);
}
// Compose a single message with all relevant files
if (allPaths.length > 0) {
fileActions.push(`Here are all the paths in the project:\n${allPaths.map((p) => ` - ${p}`).join('\n')}\n\n`);
}
if (fileActions.length === 0) {
return {
id,
content: '',
role: 'user',
parts: [],
};
}
return makeUserMessage(fileActions, id);
}
private collapseMessages(messages: UIMessage[]): UIMessage[] {
const fullMessages = [];
for (let i = 0; i < messages.length; i++) {
const message = messages[i];
if (i < this.messageIndex) {
continue;
} else if (i === this.messageIndex) {
const filteredParts = message.parts.filter((p, j) => {
if (p.type !== 'tool-invocation' || p.toolInvocation.state !== 'result') {
return true;
}
return j > this.partIndex;
});
const remainingMessage = {
...message,
content: StreamingMessageParser.stripArtifacts(message.content),
parts: filteredParts,
};
fullMessages.push(remainingMessage);
} else {
fullMessages.push(message);
}
}
const result: UIMessage[] = [];
result.push(...fullMessages);
return result;
}
shouldSendRelevantFiles(messages: UIMessage[], maxCollapsedMessagesSize: number): boolean {
// Always send files on the first message
if (messages.length === 0) {
return true;
}
// Check if we are going to collapse messages, if so, send new files
const [messageIndex, partIndex] = this.messagePartCutoff(messages, maxCollapsedMessagesSize);
if (messageIndex != this.messageIndex || partIndex != this.partIndex) {
return true;
}
// Check if any previous messages contain file artifacts with non-empty content
for (const message of messages) {
if (message.role === 'user') {
for (const part of message.parts) {
if (part.type === 'text' && part.text.includes('title="Relevant Files"')) {
// Check if there's actual content between the codinitAction tags
// We used to strip out the file content when serializing messages to store in CodinIT
const hasContent =
part.text.includes('<codinitAction type="file"') && !part.text.match(/<codinitAction[^>]*><\/codinitAction>/);
if (hasContent) {
// Only return false if we found a message with actual file content
return false;
}
}
}
}
}
return true;
}
private messagePartCutoff(messages: UIMessage[], maxCollapsedMessagesSize: number): [number, number] {
let remaining = maxCollapsedMessagesSize;
for (let messageIndex = messages.length - 1; messageIndex >= 0; messageIndex--) {
const message = messages[messageIndex];
for (let partIndex = message.parts.length - 1; partIndex >= 0; partIndex--) {
const part = message.parts[partIndex];
if (part.type === 'tool-invocation' && part.toolInvocation.state !== 'result') {
continue;
}
const size = this.partSize(part);
if (size > remaining) {
return [messageIndex, partIndex];
}
remaining -= size;
}
}
return [-1, -1];
}
private parsedAssistantMessage(message: UIMessage): ParsedAssistantMessage | null {
if (message.role !== 'assistant') {
return null;
}
const cached = this.assistantMessageCache.get(message);
if (cached) {
return cached;
}
const filesTouched = new Map<AbsolutePath, number>();
for (const file of extractFileArtifacts(makePartId(message.id, 0), message.content)) {
filesTouched.set(getAbsolutePath(file), 0);
}
for (let j = 0; j < message.parts.length; j++) {
const part = message.parts[j];
if (part.type === 'text') {
const files = extractFileArtifacts(makePartId(message.id, j), part.text);
for (const file of files) {
filesTouched.set(getAbsolutePath(file), j);
}
}
if (
part.type == 'tool-invocation' &&
part.toolInvocation.toolName == 'view' &&
part.toolInvocation.state !== 'partial-call'
) {
const args = loggingSafeParse(viewParameters, part.toolInvocation.args);
if (args.success) {
filesTouched.set(getAbsolutePath(args.data.path), j);
}
}
if (
part.type == 'tool-invocation' &&
part.toolInvocation.toolName == 'edit' &&
part.toolInvocation.state !== 'partial-call'
) {
const args = loggingSafeParse(editToolParameters, part.toolInvocation.args);
if (args.success) {
filesTouched.set(getAbsolutePath(args.data.path), j);
}
}
}
const result = {
filesTouched,
};
this.assistantMessageCache.set(message, result);
return result;
}
private partSize(part: UIMessagePart) {
const cached = this.partSizeCache.get(part);
if (cached) {
return cached;
}
let result = 0;
switch (part.type) {
case 'text':
result = part.text.length;
break;
case 'file':
result += part.data.length;
result += part.mimeType.length;
break;
case 'reasoning':
result += part.reasoning.length;
break;
case 'tool-invocation':
result += JSON.stringify(part.toolInvocation.args).length;
if (part.toolInvocation.state === 'result') {
result += JSON.stringify(part.toolInvocation.result).length;
}
break;
case 'source':
result += (part.source.title ?? '').length;
result += part.source.url.length;
break;
case 'step-start':
break;
default:
throw new Error(`Unknown part type: ${JSON.stringify(part)}`);
}
this.partSizeCache.set(part, result);
return result;
}
}
function makeUserMessage(content: string[], id: string): UIMessage {
const parts: UIMessagePart[] = content.map((c) => ({
type: 'text',
// N.B. Do not change this title "Relevant Files" without also updating `extractUrlHintAndDescription`. It's super jank
text: `<codinitArtifact id="${id}" title="Relevant Files">
${c}
</codinitArtifact>`,
}));
return {
id,
content: '',
role: 'user',
parts,
};
}
function estimateSize(entry: Dirent): number {
if (entry.type === 'file') {
return 4 + entry.content.length;
} else {
return 6;
}
}
function abbreviateToolInvocation(toolInvocation: ToolInvocation): string {
if (toolInvocation.state !== 'result') {
throw new Error(`Invalid tool invocation state: ${toolInvocation.state}`);
}
const wasError = toolInvocation.result.startsWith('Error:');
let toolCall: string;
switch (toolInvocation.toolName) {
case 'view': {
const args = loggingSafeParse(viewParameters, toolInvocation.args);
let verb = 'viewed';
if (toolInvocation.result.startsWith('Directory:')) {
verb = 'listed';
}
toolCall = `${verb} ${args?.data?.path || 'unknown file'}`;
break;
}
case 'deploy': {
toolCall = `deployed the app`;
break;
}
case 'npmInstall': {
const args = loggingSafeParse(npmInstallToolParameters, toolInvocation.args);
if (args.success) {
toolCall = `installed the dependencies ${args.data.packages}`;
} else {
toolCall = `attempted to install dependencies`;
}
break;
}
case 'edit': {
const args = loggingSafeParse(editToolParameters, toolInvocation.args);
if (args.success) {
toolCall = `edited the file ${args.data.path}`;
} else {
toolCall = `attempted to edit a file`;
}
break;
}
case 'getCodinitDeploymentName': {
toolCall = `retrieved the CodinIT deployment name`;
break;
}
default:
throw new Error(`Unknown tool name: ${toolInvocation.toolName}`);
}
return `The assistant ${toolCall} ${wasError ? 'and got an error' : 'successfully'}.`;
}
function extractFileArtifacts(partId: PartId, content: string) {
const filesTouched: Set<string> = new Set();
const parser = new StreamingMessageParser({
callbacks: {
onActionClose: (data) => {
if (data.action.type === 'file') {
const relPath = data.action.filePath;
const absPath = path.join(WORK_DIR, relPath);
filesTouched.add(absPath);
}
},
},
});
parser.parse(partId, content);
return Array.from(filesTouched);
}