examples/preprocess/content_preprocess.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import argparse
from pathlib import Path
import re
import shutil
import string

import pandas as pd

from project_settings import project_path


def get_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--data_dir",
        default=(project_path / "data2").as_posix(),
        type=str
    )
    parser.add_argument(
        "--output_file",
        default="metadata.csv",
        type=str
    )
    args = parser.parse_args()
    return args


class SentenceType(object):
    def __init__(self):
        self.advertise_keywords = [
            "请访问",
        ]
        self.url_keywords = [
            "www.",
        ]

        self.pattern_predictor_map = {
            "www.(?:.*?).(net|com|cn)": "url"
        }

    def contains_advertise(self, text: str):
        for k in self.advertise_keywords:
            if text.__contains__(k):
                return "advertise"
        return None

    def contains_url(self, text: str):
        for k in self.url_keywords:
            if text.__contains__(k):
                return "url"
        return None

    def pattern_predict(self, text: str):
        for k, v in self.pattern_predictor_map.items():
            if re.search(k, text, flags=re.IGNORECASE) is not None:
                return v
        return None

    def predict(self, text: str):
        result = self.pattern_predict(text)
        if result is not None:
            return result

        result = self.contains_advertise(text)
        if result is not None:
            return result
        return None


class ContentPreprocess(object):
    def __init__(self):
        self.s_type = SentenceType()

        self.punctuation_map = {
            "，": ",",
            "。": ".",
            "、": ",",
            "？": "?",
            "：": ":",
            "｛": "{",
            "｝": "}",
            "（": "(",
            "）": ")",
            "【": "(",
            "】": ")",
            "「": "\"",
            "」": "\"",
            "『": "\"",
            "』": "\"",
            "《": "(",
            "》": ")",
            "”": "\"",
            "“": "\"",
            "‘": "\'",
            "’": "\'",
            "=": "",

            "": "",
            " ": "",
            " ": "",
            "\t": "",
            "\n": "",
            "\r": "",
            "\v": "",
            "\f": "",

        }

        self.string_map = {
            "^_^": "",
            "◆": "",
            "☆": "",
            "...": "…",

            "()": "",
            "｛｝": "",
            "『』": "",
            "《》": "",

            "&lt;": "<",
            "&gt;": ">",
            "&amp;": " ",
            "&nbsp;": " ",
            "quot;": "\"",
            "nbsp;": " ",
            "amp;": "",
            "&#10008": "✘",

            "龙腾小说网ltxs520.com": "",
            "龙腾小说吧www.ltxsba.net": "",
            "龙腾小说网 ltxs520.com": "",
            "龙腾小说 ltxs520.com": "",
            "龙腾小说ltxs520.com": "",

            "(..)免费": "",

            "\"\"": "\"\n\"",

        }

        self.pattern_map = {
            r"</(?:.*?)>": "",
            r"⌒{4,}": "###",
            r"#{4,}": "###"
        }

        self.queue = list()
        self.queue_length = 0
        self.max_seq_length = 128

        self.output_list = list()

    def char_b2q(self, uchar):
        """单个字符 半角转全角"""
        inside_code = ord(uchar)
        if inside_code < 0x0020 or inside_code > 0x7e:
            return uchar
        if inside_code == 0x0020:
            inside_code = 0x3000
        else:
            inside_code += 0xfee0
        return chr(inside_code)

    def char_q2b(self, uchar):
        """单个字符 全角转半角"""
        inside_code = ord(uchar)
        if inside_code == 0x3000:
            inside_code = 0x0020
        else:
            inside_code -= 0xfee0
        if inside_code < 0x0020 or inside_code > 0x7e:
            return uchar
        return chr(inside_code)

    def q2b(self, text: str):
        """全角转半角"""
        result = ""
        for c in text:
            c = self.char_q2b(c)
            result += c
        return result

    def remove_space(self, text: str):
        text = text.replace(" ", "")
        return text

    def replace_punctuation(self, text: str):
        text_ = text
        for k, v in self.punctuation_map.items():
            text_ = text_.replace(k, v)

        if text_ != text:
            text_ = self.replace_punctuation(text_)
        return text_

    def replace_string(self, text: str):
        for k, v in self.string_map.items():
            text = text.replace(k, v)
        return text

    def replace_by_pattern(self, text: str):
        for k, v in self.pattern_map.items():
            text = re.sub(k, v, text)
        return text

    def process(self, text: str):
        text = self.q2b(text)
        text = self.replace_punctuation(text)
        text = self.replace_by_pattern(text)
        text = self.replace_string(text)

        self.in_queue(text)
        return text

    def in_queue(self, text: str):
        if self.s_type.predict(text) is not None:
            return
        if len(text) == 0:
            return

        text_splits = text.split(".")
        num_splits = len(text_splits)
        for idx, text_split in enumerate(text_splits):
            char_num = len(text_split)
            if self.queue_length + char_num > self.max_seq_length:
                text_ = "".join(self.queue)
                self.output_list.append(text_)

                self.queue = list()
                self.queue_length = 0

            if idx == 0 and len(self.queue) != 0:
                self.queue.append("\n")

            if num_splits == 1:
                self.queue.append(text_split)
                self.queue_length += char_num
            else:
                if idx + 1 != num_splits:
                    self.queue.append("{}.".format(text_split))
                    self.queue_length += char_num

                else:
                    self.queue.append(text_split)
                    self.queue_length += char_num

        return


def main():
    args = get_args()

    data_dir = Path(args.data_dir)
    filename_list = data_dir.glob("*/*.txt")

    s_type = SentenceType()
    c_preprocess = ContentPreprocess()

    result = list()
    for filename in filename_list:
        name = filename.stem
        splits = name.split("_")
        idx = splits[-1]
        novel_name = "_".join(splits[:-1])

        to_filename = Path(filename.as_posix().replace("/data2/", "/data3/"))
        to_filename.parent.mkdir(parents=True, exist_ok=True)

        with open(filename.as_posix(), "r", encoding="utf-8") as fin, \
            open(to_filename.as_posix(), "w", encoding="utf-8") as fout:
            for row in fin:
                row = str(row).strip()

                c_preprocess.process(row)

                for row_ in c_preprocess.output_list:
                    # print(row_)
                    # print(len(row_))
                    # print("-" * 150)
                    # result.append(row_)
                    fout.write("{}\n".format(row_))

                c_preprocess.output_list = list()

    return


if __name__ == '__main__':
    main()