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2b42456 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | """Extract tool calls from raw model output.
Models emit calls in many shapes: Qwen-native XML, OpenAI JSON, prose-wrapped
JSON in a code fence, plain-text `TOOL name | k=v`, or a bare argument object.
Extractors are tried in priority order and the first that yields calls wins.
"""
from __future__ import annotations
import json
import re
from typing import Any, Callable, Iterable, Mapping, Sequence
from .schema import ParseResult, ToolCall
from .tools import REGISTRY, canonical_name
_THINK_BLOCK = re.compile(r"<(think|thinking|reasoning|analysis)>.*?</\1>", re.S | re.I)
_THINK_OPEN = re.compile(r"<\|?(think|thinking|reasoning|analysis)\|?>.*?(?=</?tool_call|<tool_call|TOOL\s|\Z)", re.S | re.I)
_THINK_END_MARKER = "<｜end▁of▁thinking｜>"
_FENCE = re.compile(r"```(?:json|python|xml|yaml|tool_code)?\s*(.*?)```", re.S | re.I)
_XML_CALL = re.compile(r"<tool_call>(.*?)</tool_call>", re.S | re.I)
_XML_FUNCTION = re.compile(r"<function\s*=\s*([\w.\-]+)\s*>(.*?)(?:</function>|(?=<function\s*=)|(?=</tool_call>)|$)", re.S | re.I)
_XML_PARAM = re.compile(r"<parameter\s*=\s*([\w.\-]+)\s*>(.*?)(?:</parameter>|(?=<parameter\s*=)|$)", re.S | re.I)
_PLAIN_CALL = re.compile(r"(?:^|\n)\s*(?:\*\*)?TOOL(?:\s*CALL)?(?:\*\*)?\s*[:\-]?\s*([A-Za-z_][\w.\-]*)\s*(\|[^\n]*)?", re.I)
_PLAIN_CALL_ANY = re.compile(r"(?:\*\*)?TOOL(?:\s*CALL)?(?:\*\*)?\s*[:\-]?\s*[A-Za-z_][\w.\-]*\s*(?:\|[^\n]*)?", re.I)
_JSON_BLOB = re.compile(r"\{(?:[^{}]|\{[^{}]*\})*\}", re.S)
def strip_thinking(text: str) -> str:
if _THINK_END_MARKER in text:
text = text.rsplit(_THINK_END_MARKER, 1)[-1]
text = _THINK_BLOCK.sub(" ", text)
text = _THINK_OPEN.sub(" ", text)
return re.sub(r"</?(think|thinking|reasoning|analysis)>", " ", text, flags=re.I)
def _coerce(value: Any) -> Any:
if not isinstance(value, str):
return value
text = value.strip()
if not text:
return ""
stripped = text.strip("`")
if stripped in ("true", "false"):
return stripped == "true"
if stripped in ("null", "none"):
return None
try:
return json.loads(stripped)
except (ValueError, TypeError):
pass
if re.fullmatch(r"[-+]?\d+", stripped):
return int(stripped)
if re.fullmatch(r"[-+]?\d*\.\d+([eE][-+]?\d+)?", stripped):
return float(stripped)
return text
def _pair_args(raw: Mapping[str, Any] | str | None) -> dict[str, Any]:
if raw is None:
return {}
if isinstance(raw, str):
try:
raw = json.loads(raw)
except ValueError:
return {}
if not isinstance(raw, Mapping):
return {}
return {str(key): _coerce(value) for key, value in raw.items()}
def _call_from_object(obj: Any) -> list[ToolCall]:
calls: list[ToolCall] = []
if isinstance(obj, list):
for item in obj:
calls.extend(_call_from_object(item))
return calls
if not isinstance(obj, Mapping):
return calls
if isinstance(obj.get("tool_calls"), list):
for item in obj["tool_calls"]:
calls.extend(_call_from_object(item))
return calls
function = obj.get("function")
if isinstance(function, Mapping):
name = function.get("name")
if isinstance(name, str):
args = _pair_args(function.get("arguments"))
if not args and isinstance(function.get("parameters"), (Mapping, str)):
args = _pair_args(function["parameters"])
return [ToolCall(name=canonical_name(name), args=args)]
if isinstance(function, str) and obj.get("arguments") is not None:
return [ToolCall(name=canonical_name(function), args=_pair_args(obj.get("arguments")))]
name = obj.get("name") or obj.get("tool") or obj.get("tool_name") or obj.get("function_name")
if isinstance(name, str) and canonical_name(name) in REGISTRY:
args_source = None
for key in ("arguments", "args", "parameters", "input", "parameter", "params"):
if key in obj:
args_source = obj[key]
break
args = _pair_args(args_source) if args_source is not None else {
key: _coerce(value)
for key, value in obj.items()
if key not in ("name", "tool", "tool_name", "function_name", "arguments", "args", "parameters", "input", "parameter", "params", "id", "type")
}
return [ToolCall(name=canonical_name(name), args=args)]
return calls
def _extract_json(text: str) -> list[ToolCall]:
calls: list[ToolCall] = []
for match in _JSON_BLOB.finditer(text):
try:
obj = json.loads(match.group(0))
except ValueError:
continue
calls.extend(_call_from_object(obj))
return calls
def _extract_xml(text: str) -> list[ToolCall]:
calls: list[ToolCall] = []
for block in _XML_CALL.findall(text):
inner = block.strip()
if inner.startswith("{"):
try:
calls.extend(_call_from_object(json.loads(inner)))
continue
except ValueError:
pass
for name, body in _XML_FUNCTION.findall(inner or text):
args = {key: _coerce(value) for key, value in _XML_PARAM.findall(body)}
calls.append(ToolCall(name=canonical_name(name), args=args))
if not calls and "<function" in text.lower():
for name, body in _XML_FUNCTION.findall(text):
args = {key: _coerce(value) for key, value in _XML_PARAM.findall(body)}
calls.append(ToolCall(name=canonical_name(name), args=args))
return calls
def _extract_plain(text: str) -> list[ToolCall]:
calls: list[ToolCall] = []
for name, tail in _PLAIN_CALL.findall(text):
args: dict[str, Any] = {}
for chunk in (tail or "").split("|")[1:]:
if "=" in chunk:
key, value = chunk.split("=", 1)
args[key.strip().strip("`\"'")] = _coerce(value.strip().strip("`\"'"))
elif chunk.strip():
args.setdefault("value", _coerce(chunk.strip()))
calls.append(ToolCall(name=canonical_name(name), args=args))
return calls
def _extract_bare_json_args(text: str) -> list[ToolCall]:
"""A model may answer with arguments only, e.g. {"expression": "45+12"}."""
out: list[ToolCall] = []
for match in _JSON_BLOB.finditer(text):
try:
obj = json.loads(match.group(0))
except ValueError:
continue
if not isinstance(obj, Mapping) or not obj:
continue
keys = {str(key) for key in obj}
matches = [
spec.name
for spec in REGISTRY.values()
if set(spec.required) <= keys and keys <= set(spec.parameters)
]
if len(matches) == 1:
out.append(ToolCall(name=matches[0], args={str(k): _coerce(v) for k, v in obj.items()}))
return out
_STRATEGIES: tuple[tuple[str, Callable[[str], list[ToolCall]]], ...] = (
("xml", _extract_xml),
("json", _extract_json),
("plain", _extract_plain),
("bare_args", _extract_bare_json_args),
)
def parse_output(raw: str) -> ParseResult:
text = strip_thinking(raw or "")
searched: Sequence[str] = (text, *[m.group(1) for m in _FENCE.finditer(text)])
for source, extractor in _STRATEGIES:
for candidate in searched:
found = extractor(candidate)
if found:
return ParseResult(calls=tuple(found), source=source)
markers = ("<tool_call", "tool name", "to", "<function=", '"name"', '"tool_calls"', "||")
looks_like_attempt = "<tool_call" in text.lower() or bool(re.search(r"(?m)^\s*\|?(tool|to)\b", text, re.I)) or "<function=" in text.lower()
malformed = bool(looks_like_attempt) and not any(marker in text for marker in markers[:1])
return ParseResult(calls=(), source="none", malformed=malformed)
def answer_text(raw: str) -> str:
"""Model output with thinking blocks and call payloads removed."""
text = strip_thinking(raw or "")
text = _XML_CALL.sub(" ", text)
text = re.sub(r"<function\s*=.*?(?:</function>|$)", " ", text, flags=re.S | re.I)
text = _PLAIN_CALL_ANY.sub(" ", text)
text = _FENCE.sub(lambda m: m.group(1) if not m.group(1).strip().startswith("{") else " ", text)
for match in list(_JSON_BLOB.finditer(text)):
try:
obj = json.loads(match.group(0))
except ValueError:
continue
if isinstance(obj, Mapping) and ({"name", "tool_calls", "function"} & set(obj)) :
text = text[: match.start()] + " " + text[match.end() :]
return re.sub(r"\s+", " ", text).strip()
def iter_call_signatures(calls: Iterable[ToolCall]) -> list[str]:
return [call.canonical() for call in calls]
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