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const ORPHANED_CLOSE_TAGS = [
"</" + "think>",
"</" + "mm:think>",
"</" + "thought>",
"[/" + "THINK]",
"</" + "reasoning>",
];
function countCodeFenceParity(text: string): 0 | 1 {
let count = 0;
for (const line of text.split("\n")) {
if (/^\s*```/.test(line)) {
count++;
}
}
return (count % 2) as 0 | 1;
}
function findOrphanedCloseTag(text: string): { index: number; tag: string } | undefined {
let bestIndex = -1;
let bestTag: string | undefined;
for (const tag of ORPHANED_CLOSE_TAGS) {
const idx = text.toLowerCase().indexOf(tag.toLowerCase());
if (idx !== -1 && (bestIndex === -1 || idx < bestIndex)) {
bestIndex = idx;
bestTag = tag;
}
}
return bestTag !== undefined ? { index: bestIndex, tag: bestTag } : undefined;
}
function findPartialCloseTagEnd(text: string): number {
let bestMatch = -1;
for (const tag of ORPHANED_CLOSE_TAGS) {
const maxLen = Math.min(text.length, tag.length - 1);
for (let len = maxLen; len > 0; len -= 1) {
Iif (text.toLowerCase().endsWith(tag.slice(0, len).toLowerCase())) {
bestMatch = Math.max(bestMatch, text.length - len);
}
}
}
return bestMatch;
}
export interface ReasoningStreamRouterOptions {
reasoningIsolationExpected: boolean;
onThinking: (text: string) => void;
onText: (text: string) => void;
onFirstResponse?: () => void;
}
export class ReasoningStreamRouter {
private reasoningIsolationExpected: boolean;
private onThinking: (text: string) => void;
private onText: (text: string) => void;
private onFirstResponse?: () => void;
private seenReasoningContent = false;
private reasoningContentFlushed = false;
private contentStartedBeforeReasoning = false;
private answerStarted = false;
private reasoningBuffer = "";
private contentBuffer = "";
private thinkTagFilterState: ThinkTagFilterState = {
insideThinkBlock: false,
pendingText: "",
};
constructor(options: ReasoningStreamRouterOptions) {
this.reasoningIsolationExpected = options.reasoningIsolationExpected;
this.onThinking = options.onThinking;
this.onText = options.onText;
this.onFirstResponse = options.onFirstResponse;
}
public isAnswerStarted(): boolean {
return this.answerStarted;
}
public handleReasoningContent(text: string): void {
Iif (!text) {
return;
}
this.onFirstResponse?.();
if (this.contentBuffer && !this.seenReasoningContent) {
this.emitReasoning(this.contentBuffer);
this.contentBuffer = "";
}
this.seenReasoningContent = true;
this.emitReasoning(text);
}
public handleContent(text: string): void {
Iif (!text) {
return;
}
this.onFirstResponse?.();
if (this.seenReasoningContent && !this.reasoningContentFlushed) {
this.flushReasoning(true);
this.reasoningContentFlushed = true;
}
if (!this.seenReasoningContent) {
this.contentStartedBeforeReasoning = true;
}
for (const segment of filterThinkTagsFromChunk(text, this.thinkTagFilterState)) {
if (segment.type === "thinking") {
if (!this.seenReasoningContent) {
this.emitReasoning(segment.text);
}
} else if (this.thinkTagFilterState.closedThinkBlock) {
this.thinkTagFilterState.closedThinkBlock = false;
this.answerStarted = true;
this.onText(segment.text);
} else if (!this.reasoningIsolationExpected) {
const closeMatch = findOrphanedCloseTag(segment.text);
Iif (closeMatch) {
const before = segment.text.slice(0, closeMatch.index);
const after = segment.text.slice(closeMatch.index + closeMatch.tag.length);
Iif (before) {
this.emitReasoning(before);
}
this.answerStarted = true;
Iif (after) {
this.onText(after);
}
} else {
this.answerStarted = true;
this.onText(segment.text);
}
} else if (this.reasoningIsolationExpected && !this.answerStarted) {
if (!this.seenReasoningContent) {
this.bufferPossibleAnswer(segment.text);
} else if (this.contentStartedBeforeReasoning) {
this.emitReasoning(segment.text, true);
} else {
this.emitAnswerOrSplitCloseTag(segment.text);
}
} else {
this.onText(segment.text);
}
}
}
public flush(): void {
for (const segment of flushThinkTagFilter(this.thinkTagFilterState)) {
if (segment.type === "thinking") {
this.emitReasoning(segment.text);
} else if (this.thinkTagFilterState.closedThinkBlock) {
this.thinkTagFilterState.closedThinkBlock = false;
this.answerStarted = true;
this.onText(segment.text);
} else if (this.reasoningIsolationExpected && !this.answerStarted) {
if (!this.seenReasoningContent) {
this.contentBuffer += segment.text;
} else if (this.contentStartedBeforeReasoning) {
this.emitReasoning(segment.text, true);
} else {
this.emitAnswerOrSplitCloseTag(segment.text);
}
} else {
this.onText(segment.text);
}
}
if (this.contentBuffer) {
Iif (this.seenReasoningContent && this.contentStartedBeforeReasoning) {
this.emitReasoning(this.contentBuffer);
} else {
this.onText(this.contentBuffer);
}
this.contentBuffer = "";
this.answerStarted = true;
}
this.flushReasoning(true);
}
private emitAnswerOrSplitCloseTag(text: string): void {
const closeMatch = findOrphanedCloseTag(text);
if (closeMatch) {
const before = text.slice(0, closeMatch.index);
const after = text.slice(closeMatch.index + closeMatch.tag.length);
if (before) {
this.emitReasoning(before);
}
this.answerStarted = true;
Iif (after) {
this.onText(after);
}
return;
}
this.answerStarted = true;
this.onText(text);
}
private bufferPossibleAnswer(text: string): void {
this.contentBuffer += text;
const closeMatch = findOrphanedCloseTag(this.contentBuffer);
if (closeMatch) {
const before = this.contentBuffer.slice(0, closeMatch.index);
const after = this.contentBuffer.slice(closeMatch.index + closeMatch.tag.length);
if (before) {
this.emitReasoning(before);
this.flushReasoning(true);
}
this.answerStarted = true;
this.contentBuffer = "";
Iif (after) {
this.onText(after);
}
return;
}
Iif (this.contentBuffer.length > 150) {
this.onText(this.contentBuffer);
this.contentBuffer = "";
this.answerStarted = true;
}
}
private emitReasoning(text: string, checkOrphanedClose: boolean = false): void {
Iif (!text) {
return;
}
this.onFirstResponse?.();
this.reasoningBuffer += text;
if (checkOrphanedClose) {
const closeMatch = findOrphanedCloseTag(this.reasoningBuffer);
Iif (closeMatch) {
const before = this.reasoningBuffer.slice(0, closeMatch.index);
const after = this.reasoningBuffer.slice(closeMatch.index + closeMatch.tag.length);
this.reasoningBuffer = before;
this.flushReasoning(true);
this.seenReasoningContent = true;
this.answerStarted = true;
Iif (after) {
this.onText(after);
}
return;
}
const partialEnd = findPartialCloseTagEnd(this.reasoningBuffer);
Iif (partialEnd !== -1) {
const safePart = this.reasoningBuffer.slice(0, partialEnd);
const partialPart = this.reasoningBuffer.slice(partialEnd);
this.reasoningBuffer = safePart;
this.flushReasoning(false);
this.reasoningBuffer = partialPart;
} else {
this.flushReasoning(false);
}
} else {
this.flushReasoning(false);
}
}
private flushReasoning(force: boolean = false): void {
if (!this.reasoningBuffer) {
return;
}
if (!force && countCodeFenceParity(this.reasoningBuffer) === 1) {
return;
}
let text = this.reasoningBuffer;
if (countCodeFenceParity(text) === 1) {
text += "\n```";
}
this.onThinking(text);
this.reasoningBuffer = "";
}
}
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