138 lines
4.6 KiB
Python
138 lines
4.6 KiB
Python
import re
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import ast
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from typing import Dict, Any, Optional, List, Union
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class PromptManager:
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_instance = None
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def __new__(cls):
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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cls._instance._prompts = {}
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cls._instance._counter = 0
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return cls._instance
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def generate_name(self, template: str) -> str:
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"""为未命名的prompt生成名称"""
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self._counter += 1
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return f"prompt_{self._counter}"
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def register(self, prompt: "Prompt") -> None:
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"""注册一个prompt"""
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if not prompt.name:
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prompt.name = self.generate_name(prompt.template)
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self._prompts[prompt.name] = prompt
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def add_prompt(self, name: str, fstr: str) -> "Prompt":
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prompt = Prompt(fstr, name=name)
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self._prompts[prompt.name] = prompt
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return prompt
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def get_prompt(self, name: str) -> "Prompt":
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if name not in self._prompts:
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raise KeyError(f"Prompt '{name}' not found")
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return self._prompts[name]
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def format_prompt(self, name: str, **kwargs) -> str:
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prompt = self.get_prompt(name)
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return prompt.format(**kwargs)
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# 全局单例
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global_prompt_manager = PromptManager()
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class Prompt(str):
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def __new__(cls, fstr: str, name: Optional[str] = None, args: Union[List[Any], tuple[Any, ...]] = None, **kwargs):
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# 如果传入的是元组，转换为列表
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if isinstance(args, tuple):
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args = list(args)
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# 解析模板
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tree = ast.parse(f"f'''{fstr}'''", mode="eval")
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template_args = set()
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for node in ast.walk(tree):
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if isinstance(node, ast.FormattedValue):
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expr = ast.get_source_segment(fstr, node.value)
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if expr:
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template_args.add(expr)
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# 如果提供了初始参数，立即格式化
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if kwargs or args:
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formatted = cls._format_template(fstr, args=args, kwargs=kwargs)
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obj = super().__new__(cls, formatted)
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else:
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obj = super().__new__(cls, "")
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obj.template = fstr
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obj.name = name
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obj.args = template_args
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obj._args = args or []
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obj._kwargs = kwargs
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# 自动注册到全局管理器
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global_prompt_manager.register(obj)
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return obj
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@classmethod
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def _format_template(cls, template: str, args: List[Any] = None, kwargs: Dict[str, Any] = None) -> str:
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fmt_str = f"f'''{template}'''"
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tree = ast.parse(fmt_str, mode="eval")
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template_args = []
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for node in ast.walk(tree):
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if isinstance(node, ast.FormattedValue):
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expr = ast.get_source_segment(fmt_str, node.value)
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if expr and expr not in template_args:
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template_args.append(expr)
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formatted_args = {}
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formatted_kwargs = {}
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# 处理位置参数
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if args:
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for i in range(len(args)):
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arg = args[i]
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if isinstance(arg, Prompt):
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formatted_args[template_args[i]] = arg.format(**kwargs)
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else:
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formatted_args[template_args[i]] = arg
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# 处理关键字参数
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if kwargs:
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for key, value in kwargs.items():
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if isinstance(value, Prompt):
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remaining_kwargs = {k: v for k, v in kwargs.items() if k != key}
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formatted_kwargs[key] = value.format(**remaining_kwargs)
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else:
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formatted_kwargs[key] = value
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try:
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# 先用位置参数格式化
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if args:
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template = template.format(**formatted_args)
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# 再用关键字参数格式化
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if kwargs:
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template = template.format(**formatted_kwargs)
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return template
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except (IndexError, KeyError) as e:
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raise ValueError(
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f"格式化模板失败: {template}, args={formatted_args}, kwargs={formatted_kwargs} {str(e)} keys:{template_args}"
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) from e
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def format(self, *args, **kwargs) -> "Prompt":
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"""支持位置参数和关键字参数的格式化，使用"""
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ret = type(self)(
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self.template, self.name, args=list(args) if args else self._args, **kwargs if kwargs else self._kwargs
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)
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print(f"prompt build result: {ret} name: {ret.name} ")
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return ret
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def __str__(self) -> str:
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if self._kwargs or self._args:
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return super().__str__()
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return self.template
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def __repr__(self) -> str:
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return f"Prompt(template='{self.template}', name='{self.name}')"
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