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370 lines (292 loc) · 10.8 KB
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import type { PartId } from './partId.js';
import type { CodinitAction, CodinitArtifactData, ActionType, FileAction } from './types.js';
import { createScopedLogger } from './utils/logger.js';
import { getRelativePath } from './utils/workDir.js';
import { unreachable } from './utils/unreachable.js';
const ARTIFACT_TAG_OPEN_CODINIT = '<codinitArtifact';
const ARTIFACT_TAG_CLOSE_CODINIT = '</codinitArtifact>';
const ARTIFACT_ACTION_TAG_OPEN_CODINIT = '<codinitAction';
const ARTIFACT_ACTION_TAG_CLOSE_CODINIT = '</codinitAction>';
const ARTIFACT_TAGS_OPEN = [ARTIFACT_TAG_OPEN_CODINIT];
const logger = createScopedLogger('MessageParser');
export interface ArtifactCallbackData extends CodinitArtifactData {
partId: PartId;
}
export interface ActionCallbackData {
artifactId: string;
partId: PartId;
actionId: string;
action: CodinitAction;
}
export type ArtifactCallback = (data: ArtifactCallbackData) => void;
export type ActionCallback = (data: ActionCallbackData) => void;
interface ParserCallbacks {
onArtifactOpen?: ArtifactCallback;
onArtifactClose?: ArtifactCallback;
onActionOpen?: ActionCallback;
onActionStream?: ActionCallback;
onActionClose?: ActionCallback;
}
interface ElementFactoryProps {
partId: PartId;
}
type ElementFactory = (props: ElementFactoryProps) => string;
interface StreamingMessageParserOptions {
callbacks?: ParserCallbacks;
artifactElement?: ElementFactory;
}
interface MessageState {
position: number;
insideArtifact: boolean;
insideAction: boolean;
currentArtifact?: CodinitArtifactData;
currentAction: CodinitAction | null;
actionId: number;
hasCreatedArtifact: boolean;
artifactTagName?: string; // 'codinitArtifact'
}
export class StreamingMessageParser {
#messages = new Map<string, MessageState>();
constructor(private _options: StreamingMessageParserOptions = {}) { }
static stripArtifacts(content: string): string {
// Strip codinit artifacts
let result = content;
result = result.replace(/<codinitArtifact[^>]*>[\s\S]*?<\/codinitArtifact>/g, '');
return result;
}
parse(partId: PartId, input: string) {
let state = this.#messages.get(partId);
if (!state) {
state = {
position: 0,
insideAction: false,
insideArtifact: false,
currentAction: null,
actionId: 0,
hasCreatedArtifact: false,
};
this.#messages.set(partId, state);
}
let output = '';
let i = state.position;
let earlyBreak = false;
while (i < input.length) {
if (state.insideArtifact) {
const currentArtifact = state.currentArtifact;
if (currentArtifact === undefined) {
unreachable('Artifact not initialized');
}
const closeTag = ARTIFACT_TAG_CLOSE_CODINIT;
const actionOpenTag = ARTIFACT_ACTION_TAG_OPEN_CODINIT;
const actionCloseTag = ARTIFACT_ACTION_TAG_CLOSE_CODINIT;
if (state.insideAction) {
if (!state.currentAction) {
unreachable('Action not initialized');
}
const closeIndex = input.indexOf(actionCloseTag, i);
const currentAction = state.currentAction;
if (closeIndex !== -1) {
const actionContent = input.slice(i, closeIndex);
let content = actionContent.trim();
if (currentAction && currentAction.type === 'file') {
// Remove markdown code block syntax if present and file is not markdown
if (!currentAction.filePath.endsWith('.md')) {
content = cleanoutMarkdownSyntax(content);
content = cleanEscapedTags(content);
}
content += '\n';
}
currentAction.content = content;
this._options.callbacks?.onActionClose?.({
artifactId: currentArtifact.id,
partId,
actionId: String(state.actionId - 1),
action: currentAction as CodinitAction,
});
state.insideAction = false;
state.currentAction = null;
i = closeIndex + actionCloseTag.length;
} else {
if (currentAction && currentAction.type === 'file') {
let content = input.slice(i);
if (!currentAction.filePath.endsWith('.md')) {
content = cleanoutMarkdownSyntax(content);
content = cleanEscapedTags(content);
}
this._options.callbacks?.onActionStream?.({
artifactId: currentArtifact.id,
partId,
actionId: String(state.actionId - 1),
action: {
...(currentAction as FileAction),
content,
filePath: currentAction.filePath,
},
});
}
break;
}
} else {
const actionOpenIndex = input.indexOf(actionOpenTag, i);
const artifactCloseIndex = input.indexOf(closeTag, i);
if (actionOpenIndex !== -1 && (artifactCloseIndex === -1 || actionOpenIndex < artifactCloseIndex)) {
const actionEndIndex = input.indexOf('>', actionOpenIndex);
if (actionEndIndex !== -1) {
state.insideAction = true;
state.currentAction = this.#parseActionTag(input, actionOpenIndex, actionEndIndex);
this._options.callbacks?.onActionOpen?.({
artifactId: currentArtifact.id,
partId,
actionId: String(state.actionId++),
action: state.currentAction as CodinitAction,
});
i = actionEndIndex + 1;
} else {
break;
}
} else if (artifactCloseIndex !== -1) {
this._options.callbacks?.onArtifactClose?.({ partId, ...currentArtifact });
state.insideArtifact = false;
state.currentArtifact = undefined;
state.artifactTagName = undefined;
i = artifactCloseIndex + closeTag.length;
} else {
break;
}
}
} else if (input[i] === '<' && input[i + 1] !== '/') {
let j = i;
let potentialTag = '';
let processed = false;
while (j < input.length) {
potentialTag += input[j];
// Check if it matches any tag exactly
const matchedTag = ARTIFACT_TAGS_OPEN.find(t => t === potentialTag);
if (matchedTag) {
const nextChar = input[j + 1];
if (nextChar && nextChar !== '>' && nextChar !== ' ') {
output += input.slice(i, j + 1);
i = j + 1;
processed = true;
break;
}
const openTagEnd = input.indexOf('>', j);
if (openTagEnd !== -1) {
const artifactTag = input.slice(i, openTagEnd + 1);
const artifactTitle = this.#extractAttribute(artifactTag, 'title') as string;
const type = this.#extractAttribute(artifactTag, 'type') as string;
const artifactId = this.#extractAttribute(artifactTag, 'id') as string;
if (!artifactTitle) {
logger.warn('Artifact title missing');
}
if (!artifactId) {
logger.warn('Artifact id missing');
}
state.insideArtifact = true;
state.artifactTagName = 'codinitArtifact';
const currentArtifact = {
id: artifactId,
title: artifactTitle,
type,
} satisfies CodinitArtifactData;
state.currentArtifact = currentArtifact;
this._options.callbacks?.onArtifactOpen?.({ partId, ...currentArtifact });
if (!state.hasCreatedArtifact) {
const artifactFactory = this._options.artifactElement ?? createArtifactElement;
output += artifactFactory({ partId });
state.hasCreatedArtifact = true;
}
i = openTagEnd + 1;
processed = true;
} else {
earlyBreak = true;
}
break;
} else if (!ARTIFACT_TAGS_OPEN.some(t => t.startsWith(potentialTag))) {
// Not a prefix of ANY tag
output += input.slice(i, j + 1);
i = j + 1;
processed = true;
break;
}
j++;
}
if (processed) {
if (earlyBreak) {
break;
}
continue;
} else {
// Partial match at end of input - check if it's a potential artifact tag
const isPartialArtifactTag = ARTIFACT_TAGS_OPEN.some(t => t.startsWith(potentialTag));
if (isPartialArtifactTag) {
// Strip partial artifact tags at end of input - don't add to output
i = input.length; // Skip to end
} else {
// Not an artifact tag, include it in output
output += input.slice(i);
i = input.length;
}
break;
}
} else {
output += input[i];
i++;
}
if (earlyBreak) {
break;
}
}
state.position = i;
return output;
}
reset() {
this.#messages.clear();
}
#parseActionTag(input: string, actionOpenIndex: number, actionEndIndex: number) {
const actionTag = input.slice(actionOpenIndex, actionEndIndex + 1);
const actionType = this.#extractAttribute(actionTag, 'type') as ActionType;
const actionAttributes = {
type: actionType,
content: '',
};
if (actionType === 'file') {
const filePath = this.#extractAttribute(actionTag, 'filePath') as string;
if (!filePath) {
logger.debug('File path not specified');
}
(actionAttributes as FileAction).filePath = getRelativePath(filePath);
} else {
logger.warn(`Unknown action type '${actionType}'`);
}
return actionAttributes as FileAction;
}
#extractAttribute(tag: string, attributeName: string): string | undefined {
const match = tag.match(new RegExp(`${attributeName}="([^"]*)"`, 'i'));
return match ? match[1] : undefined;
}
}
const createArtifactElement: ElementFactory = (props) => {
const elementProps = [
'class="__codinitArtifact__"',
...Object.entries(props).map(([key, value]) => {
return `data-${camelToDashCase(key)}=${JSON.stringify(value)}`;
}),
];
return `<div ${elementProps.join(' ')}></div>`;
};
function camelToDashCase(input: string) {
return input.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
}
function cleanoutMarkdownSyntax(content: string) {
const codeBlockRegex = /^\s*```\w*\n([\s\S]*?)\n\s*```\s*$/;
const match = content.match(codeBlockRegex);
if (match) {
return match[1]; // Remove common leading 4-space indent
} else {
return content;
}
}
function cleanEscapedTags(content: string) {
return content.replace(/</g, '<').replace(/>/g, '>');
}