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88 lines
3.4 KiB
Python
88 lines
3.4 KiB
Python
"""
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Module for parsing the HTML node
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"""
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from typing import List
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from langchain.text_splitter import RecursiveCharacterTextSplitter
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from langchain_community.document_transformers import Html2TextTransformer
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from .base_node import BaseNode
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class ParseNode(BaseNode):
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"""
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A node responsible for parsing HTML content from a document.
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It uses BeautifulSoupTransformer for parsing, providing flexibility in extracting
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specific parts of an HTML document.
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This node enhances the scraping workflow by allowing for targeted extraction of
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content, thereby optimizing the processing of large HTML documents.
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Attributes:
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node_name (str): The unique identifier name for the node, defaulting to "ParseHTMLNode".
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node_type (str): The type of the node, set to "node" indicating a standard operational node.
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Args:
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node_name (str, optional): The unique identifier name for the node.
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Defaults to "ParseHTMLNode".
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Methods:
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execute(state): Parses the HTML document contained within the state using
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the specified tags, if provided, and updates the state with the parsed content.
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"""
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def __init__(self, input: str, output: List[str], node_config: dict, node_name: str = "Parse"):
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"""
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Initializes the ParseHTMLNode with a node name.
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Args:
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doc_type (str): type of the input document
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chunks_size (int): size of the chunks to split the document
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node_name (str): name of the node
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node_type (str, optional): type of the node
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"""
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super().__init__(node_name, "node", input, output, 1, node_config)
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self.verbose = True if node_config is None else node_config.get("verbose", False)
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def execute(self, state):
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"""
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Executes the node's logic to parse the HTML document based on specified tags.
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If tags are provided in the state, the document is parsed accordingly; otherwise,
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the document remains unchanged. The method updates the state with either the original
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or parsed document under the 'parsed_document' key.
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Args:
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state (dict): The current state of the graph, expected to contain
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'document' within 'keys', and optionally 'tags' for targeted parsing.
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Returns:
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dict: The updated state with the 'parsed_document' key containing the parsed content,
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if tags were provided, or the original document otherwise.
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Raises:
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KeyError: If 'document' is not found in the state, indicating that the necessary
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information for parsing is missing.
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"""
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if self.verbose:
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print(f"--- Executing {self.node_name} Node ---")
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# Interpret input keys based on the provided input expression
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input_keys = self.get_input_keys(state)
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# Fetching data from the state based on the input keys
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input_data = [state[key] for key in input_keys]
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text_splitter = RecursiveCharacterTextSplitter.from_tiktoken_encoder(
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chunk_size=self.node_config.get("chunk_size", 4096),
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chunk_overlap=0,
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)
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# Parse the document
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docs_transformed = Html2TextTransformer(
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).transform_documents(input_data[0])[0]
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chunks = text_splitter.split_text(docs_transformed.page_content)
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state.update({self.output[0]: chunks})
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return state
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