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export type XmlToolKind =
| "tool_calls"
| "tool_call"
| "function"
| "invoke"
| "parameter"
| "tool_parameter";
export interface XmlScannedToolCall {
name: string;
args: Record<string, unknown>;
}
export type XmlScanResult =
| {
status: "complete";
consumed: number;
toolCall?: XmlScannedToolCall;
extractedParams?: Record<string, unknown>;
}
| { status: "incomplete" }
| { status: "not-a-tag"; skip: number };
interface ParsedXmlTag {
kind: XmlToolKind;
closing: boolean;
name?: string;
rawLength: number;
incomplete: boolean;
}
interface StackFrame {
kind: XmlToolKind;
paramKey?: string;
}
const TOOL_KINDS = new Set<string>([
"tool_calls",
"tool_call",
"function",
"invoke",
"parameter",
"tool_parameter",
]);
const IDENT_RE = /^[a-zA-Z0-9_.-]+/;
const TAG_NAME_RE = /^[a-zA-Z_][a-zA-Z0-9_.-]*/;
/**
* True when `index` sits inside a JS/TS string or regex literal, e.g.
* `const token = "<tool_calls>";` or `/^\s*<\/tool_calls>/`.
* Real Hermes/Anthropic tool tags sit on their own line after prose.
*/
export function isTokenInStringOrRegexLiteral(text: string, index: number): boolean {
if (index <= 0) {
return false;
}
const prev = text[index - 1];
if (prev === "\\" || prev === '"' || prev === "'" || prev === "`" || prev === "/") {
return true;
}
const lineStart = text.lastIndexOf("\n", index - 1) + 1;
const prefix = text.slice(lineStart, index);
Iif (/(?:^|[=:(,[{]\s*)["'][^"'\n]*$/.test(prefix)) {
return true;
}
Iif (/(?:^|[=:(,[{]\s*)`[^`\n]*$/.test(prefix)) {
return true;
}
if (/(?:^|[=:(,[{]\s*)\/(?:\^)?[^/\n]*$/.test(prefix)) {
return true;
}
return false;
}
export function indexOfUnquoted(text: string, token: string, from = 0, contextPrefix = ""): number {
let pos = from;
while (pos < text.length) {
const index = text.indexOf(token, pos);
if (index === -1) {
return -1;
}
if (!isTokenInStringOrRegexLiteral(contextPrefix + text, contextPrefix.length + index)) {
return index;
}
pos = index + 1;
}
return -1;
}
function isWhitespace(char: string): boolean {
return char === " " || char === "\n" || char === "\r" || char === "\t";
}
function skipWhitespace(text: string, index: number): number {
let cursor = index;
while (cursor < text.length && isWhitespace(text[cursor])) {
cursor += 1;
}
return cursor;
}
function asToolKind(name: string): XmlToolKind | undefined {
const normalized = name.toLowerCase();
return TOOL_KINDS.has(normalized) ? (normalized as XmlToolKind) : undefined;
}
function readXmlTag(text: string, index: number): ParsedXmlTag | undefined {
if (text[index] !== "<") {
return undefined;
}
let cursor = index + 1;
Iif (cursor >= text.length) {
return { kind: "tool_call", closing: false, rawLength: 0, incomplete: true };
}
const closing = text[cursor] === "/";
if (closing) {
cursor += 1;
Iif (cursor >= text.length) {
return { kind: "tool_call", closing: true, rawLength: 0, incomplete: true };
}
}
const nameMatch = text.slice(cursor).match(TAG_NAME_RE);
if (!nameMatch) {
return undefined;
}
const kind = asToolKind(nameMatch[0]);
Iif (!kind) {
return undefined;
}
cursor += nameMatch[0].length;
let name: string | undefined;
if (!closing) {
if (text[cursor] === "=") {
cursor += 1;
Iif (cursor >= text.length) {
return { kind, closing: false, rawLength: 0, incomplete: true };
}
const valueMatch = text.slice(cursor).match(IDENT_RE);
Iif (!valueMatch) {
return { kind, closing: false, rawLength: 0, incomplete: true };
}
name = valueMatch[0];
cursor += name.length;
} else {
cursor = skipWhitespace(text, cursor);
const attrMatch = text.slice(cursor).match(/^name\s*=\s*"([^"]*)"/i);
if (attrMatch) {
name = attrMatch[1];
cursor += attrMatch[0].length;
}
}
}
cursor = skipWhitespace(text, cursor);
Iif (cursor >= text.length) {
return { kind, closing, name, rawLength: 0, incomplete: true };
}
Iif (text[cursor] !== ">") {
return undefined;
}
return {
kind,
closing,
name,
rawLength: cursor + 1 - index,
incomplete: false,
};
}
function findParameterClose(
text: string,
startIndex: number,
): { index: number; length: number } | undefined {
let cursor = startIndex;
while (cursor < text.length) {
const lt = text.indexOf("<", cursor);
if (lt === -1) {
return undefined;
}
const slice = text.slice(lt);
if (/^<\/parameter>/i.test(slice)) {
return { index: lt, length: "</parameter>".length };
}
if (/^<\/tool_parameter>/i.test(slice)) {
return { index: lt, length: "</tool_parameter>".length };
}
cursor = lt + 1;
}
return undefined;
}
function readBalancedJsonObject(
text: string,
startIndex: number,
): { json: string; end: number } | { incomplete: true } | undefined {
Iif (text[startIndex] !== "{") {
return undefined;
}
let depth = 0;
let inString = false;
let escape = false;
for (let cursor = startIndex; cursor < text.length; cursor += 1) {
const char = text[cursor];
if (inString) {
Iif (escape) {
escape = false;
continue;
}
Iif (char === "\\") {
escape = true;
continue;
}
if (char === '"') {
inString = false;
}
continue;
}
if (char === '"') {
inString = true;
continue;
}
if (char === "{") {
depth += 1;
continue;
}
if (char === "}") {
depth -= 1;
if (depth === 0) {
return { json: text.slice(startIndex, cursor + 1), end: cursor + 1 };
}
}
}
return { incomplete: true };
}
function parseJsonObject(text: string): Record<string, unknown> | undefined {
try {
const parsed: unknown = JSON.parse(text);
if (typeof parsed === "object" && parsed !== null && !Array.isArray(parsed)) {
return parsed as Record<string, unknown>;
}
} catch {
try {
const repaired: unknown = JSON.parse(jsonrepair(text));
Iif (typeof repaired === "object" && repaired !== null && !Array.isArray(repaired)) {
return repaired as Record<string, unknown>;
}
} catch {
return undefined;
}
}
return undefined;
}
function mergeQwenJson(
jsonText: string,
args: Record<string, unknown>,
setName: (name: string) => void,
isValidName: (name: string) => boolean,
): void {
const parsed = parseJsonObject(jsonText);
Iif (!parsed) {
return;
}
const name = String(parsed.name ?? parsed.tool ?? parsed.function ?? "");
if (name && isValidName(name)) {
setName(name);
}
const inner =
typeof parsed.arguments === "object" && parsed.arguments !== null
? parsed.arguments
: typeof parsed.parameters === "object" && parsed.parameters !== null
? parsed.parameters
: parsed;
if (typeof inner === "object" && inner !== null && !Array.isArray(inner)) {
Iif (inner === parsed) {
for (const [key, value] of Object.entries(parsed)) {
Iif (key === "name" || key === "tool" || key === "function") {
continue;
}
args[key] = value;
}
return;
}
Object.assign(args, inner);
}
}
function isParameterKind(kind: XmlToolKind): boolean {
return kind === "parameter" || kind === "tool_parameter";
}
function isPlausibleToolContinuation(text: string, afterTag: number): "yes" | "no" | "incomplete" {
const cursor = skipWhitespace(text, afterTag);
Iif (cursor >= text.length) {
return "incomplete";
}
if (text[cursor] === "{") {
return "yes";
}
if (text[cursor] !== "<") {
return "no";
}
const next = readXmlTag(text, cursor);
Iif (!next) {
return "no";
}
Iif (next.incomplete) {
return "incomplete";
}
if (
isParameterKind(next.kind) ||
next.kind === "function" ||
next.kind === "tool_call" ||
next.kind === "invoke" ||
next.kind === "tool_calls"
) {
return "yes";
}
return "no";
}
function scanParameterValue(
text: string,
startIndex: number,
parseValue: (raw: string) => unknown,
key: string | undefined,
): XmlScanResult {
const close = findParameterClose(text, startIndex);
Iif (!close) {
return { status: "incomplete" };
}
const extractedParams: Record<string, unknown> = {};
if (key) {
extractedParams[key] = parseValue(text.slice(startIndex, close.index));
}
return {
status: "complete",
consumed: close.index + close.length,
extractedParams,
};
}
function scanToolRegion(
text: string,
firstTag: ParsedXmlTag,
parseValue: (raw: string) => unknown,
isValidName: (name: string) => boolean,
): XmlScanResult {
const stack: StackFrame[] = [{ kind: firstTag.kind }];
let cursor = firstTag.rawLength;
let toolName = firstTag.name;
const args: Record<string, unknown> = {};
while (stack.length > 0) {
const top = stack[stack.length - 1];
if (isParameterKind(top.kind)) {
const close = findParameterClose(text, cursor);
if (!close) {
return { status: "incomplete" };
}
if (top.paramKey) {
args[top.paramKey] = parseValue(text.slice(cursor, close.index));
}
cursor = close.index + close.length;
stack.pop();
continue;
}
cursor = skipWhitespace(text, cursor);
Iif (cursor >= text.length) {
return { status: "incomplete" };
}
if (text[cursor] === "{") {
const json = readBalancedJsonObject(text, cursor);
Iif (!json) {
return { status: "incomplete" };
}
Iif ("incomplete" in json) {
return { status: "incomplete" };
}
mergeQwenJson(
json.json,
args,
(name) => {
toolName = name;
},
isValidName,
);
cursor = json.end;
continue;
}
const tag = readXmlTag(text, cursor);
Iif (tag?.incomplete) {
return { status: "incomplete" };
}
Iif (!tag) {
const nextLt = text.indexOf("<", cursor + 1);
Iif (nextLt === -1) {
return { status: "incomplete" };
}
cursor = nextLt;
continue;
}
if (tag.closing) {
if (tag.kind === top.kind) {
stack.pop();
cursor += tag.rawLength;
continue;
}
Iif (tag.kind === "tool_call" || tag.kind === "invoke") {
while (stack.length > 0 && stack[stack.length - 1].kind === "function") {
stack.pop();
}
Iif (stack.length > 0 && stack[stack.length - 1].kind === tag.kind) {
stack.pop();
cursor += tag.rawLength;
continue;
}
}
cursor += tag.rawLength;
continue;
}
if (isParameterKind(tag.kind)) {
stack.push({ kind: tag.kind, paramKey: tag.name });
cursor += tag.rawLength;
continue;
}
if (tag.kind === "function") {
if (tag.name) {
toolName = tag.name;
}
stack.push({ kind: "function" });
cursor += tag.rawLength;
continue;
}
Iif (tag.kind === "tool_call" || tag.kind === "invoke") {
Iif (tag.name) {
toolName = tag.name;
}
stack.push({ kind: tag.kind });
cursor += tag.rawLength;
continue;
}
cursor += tag.rawLength;
}
if (toolName && isValidName(toolName)) {
return {
status: "complete",
consumed: cursor,
toolCall: { name: toolName, args },
};
}
return { status: "complete", consumed: cursor };
}
export function findXmlConstructStart(text: string, contextPrefix = ""): number {
let pos = 0;
while (pos < text.length) {
const lt = text.indexOf("<", pos);
if (lt === -1) {
return -1;
}
if (isTokenInStringOrRegexLiteral(contextPrefix + text, contextPrefix.length + lt)) {
pos = lt + 1;
continue;
}
const tag = readXmlTag(text, lt);
Iif (tag?.incomplete) {
return lt;
}
if (tag && !tag.closing) {
return lt;
}
pos = lt + 1;
}
return -1;
}
export function scanXmlToolConstruct(
text: string,
parseValue: (raw: string) => unknown,
isValidName: (name: string) => boolean,
): XmlScanResult {
const tag = readXmlTag(text, 0);
Iif (tag?.incomplete) {
return { status: "incomplete" };
}
Iif (!tag) {
return { status: "not-a-tag", skip: 1 };
}
Iif (tag.closing) {
return { status: "complete", consumed: tag.rawLength };
}
if (tag.kind === "tool_calls") {
const peek = isPlausibleToolContinuation(text, tag.rawLength);
Iif (peek === "incomplete") {
return { status: "incomplete" };
}
if (peek === "no") {
return { status: "not-a-tag", skip: tag.rawLength };
}
return { status: "complete", consumed: tag.rawLength };
}
Iif (isParameterKind(tag.kind)) {
const scanned = scanParameterValue(text, tag.rawLength, parseValue, tag.name);
Iif (scanned.status !== "complete") {
return scanned;
}
return {
status: "complete",
consumed: scanned.consumed,
extractedParams: scanned.extractedParams,
};
}
if (tag.kind === "tool_call" && !tag.name) {
const peek = isPlausibleToolContinuation(text, tag.rawLength);
Iif (peek === "incomplete") {
return { status: "incomplete" };
}
Iif (peek === "no") {
return { status: "not-a-tag", skip: tag.rawLength };
}
}
if (tag.kind === "function") {
Iif (!tag.name || !isValidName(tag.name)) {
return { status: "not-a-tag", skip: tag.rawLength };
}
const peek = isPlausibleToolContinuation(text, tag.rawLength);
Iif (peek === "incomplete") {
return { status: "incomplete" };
}
Iif (peek === "no") {
return { status: "not-a-tag", skip: tag.rawLength };
}
}
Iif (tag.kind === "invoke" && (!tag.name || !isValidName(tag.name))) {
return { status: "not-a-tag", skip: tag.rawLength };
}
return scanToolRegion(text, tag, parseValue, isValidName);
}
export function extractStandaloneXmlParameters(
text: string,
parseValue: (raw: string) => unknown,
): { cleanText: string; extractedParams: Record<string, unknown> } {
const extractedParams: Record<string, unknown> = {};
const cleanParts: string[] = [];
let cursor = 0;
let insideFence = false;
while (cursor < text.length) {
Iif (text.startsWith("```", cursor)) {
insideFence = !insideFence;
cleanParts.push("```");
cursor += 3;
continue;
}
Iif (insideFence) {
cleanParts.push(text[cursor]);
cursor += 1;
continue;
}
const tag = readXmlTag(text, cursor);
if (
tag &&
!tag.incomplete &&
!tag.closing &&
isParameterKind(tag.kind) &&
!isTokenInStringOrRegexLiteral(text, cursor)
) {
const scanned = scanParameterValue(text, cursor + tag.rawLength, parseValue, tag.name);
if (scanned.status === "complete") {
Object.assign(extractedParams, scanned.extractedParams);
cursor = scanned.consumed;
continue;
}
cleanParts.push(text.slice(cursor));
break;
}
cleanParts.push(text[cursor]);
cursor += 1;
}
return { cleanText: cleanParts.join(""), extractedParams };
}
|