94 lines
3.4 KiB
Python
94 lines
3.4 KiB
Python
"""Class for representing a messages entry."""
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import re
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from string import Template
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from typing import Dict, List, Optional, Union
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from guardrails.prompt import Prompt, Instructions
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from guardrails.classes.templating.namespace_template import NamespaceTemplate
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from guardrails.utils.constants import constants
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from guardrails.utils.templating_utils import get_template_variables
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class Messages:
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def __init__(
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self,
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source: List[Dict[str, Union[str, Prompt, Instructions]]],
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output_schema: Optional[str] = None,
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*,
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xml_output_schema: Optional[str] = None,
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):
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self._source = source
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# FIXME: Why is this happening on init instead of on format?
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# Substitute constants in the prompt.
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for message in self._source:
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# if content is instance of Prompt class
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# call the substitute_constants method
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if isinstance(message["content"], str):
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message["content"] = self.substitute_constants(message["content"])
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# FIXME: Why is this happening on init instead of on format?
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# If an output schema is provided, substitute it in the prompt.
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if output_schema or xml_output_schema:
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for message in self._source:
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if isinstance(message["content"], str):
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message["content"] = Template(message["content"]).safe_substitute(
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output_schema=output_schema, xml_output_schema=xml_output_schema
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)
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else:
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self.source = source
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# Ensure self.source is iterable
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self.source = list(self._source)
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self._index = 0
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def __iter__(self):
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self._index = 0
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return self
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def __next__(self):
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if self._index < len(self.source):
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result = self.source[self._index]
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self._index += 1
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return result
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else:
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raise StopIteration
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def format(
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self,
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**kwargs,
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):
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"""Format the messages using the given keyword arguments."""
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formatted_messages = []
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for message in self.source:
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if isinstance(message["content"], str):
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msg_str = message["content"]
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else:
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msg_str = message["content"]._source
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# Only use the keyword arguments that are present in the message.
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vars = get_template_variables(msg_str)
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filtered_kwargs = {k: v for k, v in kwargs.items() if k in vars}
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# Return another instance of the class with the formatted message.
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formatted_message = Template(msg_str).safe_substitute(**filtered_kwargs)
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formatted_messages.append(
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{"role": message["role"], "content": formatted_message}
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)
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return Messages(formatted_messages)
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def substitute_constants(self, text):
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"""Substitute constants in the prompt."""
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# Substitute constants by reading the constants file.
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# Regex to extract all occurrences of ${gr.<constant_name>}
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matches = re.findall(r"\${gr\.(\w+)}", text)
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# Substitute all occurrences of ${gr.<constant_name>}
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# with the value of the constant.
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for match in matches:
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template = NamespaceTemplate(text)
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mapping = {f"gr.{match}": constants[match]}
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text = template.safe_substitute(**mapping)
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return text
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