ragflow/rag/app/manual.py

import copy
import re

from api.db import ParserType
from rag.nlp import huqie, tokenize, tokenize_table, add_positions, bullets_category, title_frequency
from deepdoc.parser import PdfParser
from rag.utils import num_tokens_from_string


class Pdf(PdfParser):
    def __init__(self):
        self.model_speciess = ParserType.MANUAL.value
        super().__init__()

    def __call__(self, filename, binary=None, from_page=0,
                 to_page=100000, zoomin=3, callback=None):
        from timeit import default_timer as timer
        start = timer()
        callback(msg="OCR is  running...")
        self.__images__(
            filename if not binary else binary,
            zoomin,
            from_page,
            to_page,
            callback
        )
        callback(msg="OCR finished.")
        #for bb in self.boxes:
        #    for b in bb:
        #        print(b)
        print("OCR:", timer()-start)

        def get_position(bx):
            poss = []
            pn = bx["page_number"]
            top = bx["top"] - self.page_cum_height[pn - 1]
            bott = bx["bottom"] - self.page_cum_height[pn - 1]
            poss.append((pn, bx["x0"], bx["x1"], top, min(bott, self.page_images[pn-1].size[1]/zoomin)))
            while bott * zoomin > self.page_images[pn - 1].size[1]:
                bott -= self.page_images[pn- 1].size[1] / zoomin
                top = 0
                pn += 1
                poss.append((pn, bx["x0"], bx["x1"], top, min(bott, self.page_images[pn - 1].size[1] / zoomin)))
            return poss

        def tag(pn, left, right, top, bottom):
            return "@@{}\t{:.1f}\t{:.1f}\t{:.1f}\t{:.1f}##" \
                .format(pn, left, right, top, bottom)

        self._layouts_rec(zoomin)
        callback(0.65, "Layout analysis finished.")
        print("paddle layouts:", timer() - start)
        self._table_transformer_job(zoomin)
        callback(0.67, "Table analysis finished.")
        self._text_merge()
        tbls = self._extract_table_figure(True, zoomin, True, True)
        self._naive_vertical_merge()
        self._filter_forpages()
        callback(0.68, "Text merging finished")

        # clean mess
        for b in self.boxes:
            b["text"] = re.sub(r"([\t 　]|\u3000){2,}", " ", b["text"].strip())

        # merge chunks with the same bullets
        self._merge_with_same_bullet()

        # set pivot using the most frequent type of title,
        # then merge between 2 pivot
        bull = bullets_category([b["text"] for b in self.boxes])
        most_level, levels = title_frequency(bull, [(b["text"], b.get("layout_no","")) for b in self.boxes])
        assert len(self.boxes) == len(levels)
        sec_ids = []
        sid = 0
        for i, lvl in enumerate(levels):
            if lvl <= most_level: sid += 1
            sec_ids.append(sid)
            #print(lvl, self.boxes[i]["text"], most_level)

        sections = [(b["text"], sec_ids[i], get_position(b)) for i, b in enumerate(self.boxes)]
        for (img, rows), poss in tbls:
            sections.append((rows[0], -1, [(p[0]+1, p[1], p[2], p[3], p[4]) for p in poss]))

        chunks = []
        last_sid = -2
        for txt, sec_id, poss in sorted(sections, key=lambda x: (x[-1][0][0], x[-1][0][3], x[-1][0][1])):
            poss = "\t".join([tag(*pos) for pos in poss])
            if sec_id == last_sid or sec_id == -1:
                if chunks:
                    chunks[-1] += "\n" + txt + poss
                    continue
            chunks.append(txt + poss)
            if sec_id >-1: last_sid = sec_id
        return chunks


def chunk(filename, binary=None, from_page=0, to_page=100000, lang="Chinese", callback=None, **kwargs):
    """
        Only pdf is supported.
    """
    pdf_parser = None

    if re.search(r"\.pdf$", filename, re.IGNORECASE):
        pdf_parser = Pdf()
        cks = pdf_parser(filename if not binary else binary,
                           from_page=from_page, to_page=to_page, callback=callback)
    else: raise NotImplementedError("file type not supported yet(pdf supported)")
    doc = {
        "docnm_kwd": filename
    }
    doc["title_tks"] = huqie.qie(re.sub(r"\.[a-zA-Z]+$", "", doc["docnm_kwd"]))
    doc["title_sm_tks"] = huqie.qieqie(doc["title_tks"])
    # is it English
    eng = lang.lower() == "english"#pdf_parser.is_english

    i = 0
    chunk = []
    tk_cnt = 0
    res = []
    def add_chunk():
        nonlocal chunk, res, doc, pdf_parser, tk_cnt
        d = copy.deepcopy(doc)
        ck = "\n".join(chunk)
        tokenize(d, pdf_parser.remove_tag(ck), eng)
        d["image"], poss = pdf_parser.crop(ck, need_position=True)
        add_positions(d, poss)
        res.append(d)
        chunk = []
        tk_cnt = 0

    while i < len(cks):
        if tk_cnt > 256: add_chunk()
        txt = cks[i]
        txt_ = pdf_parser.remove_tag(txt)
        i += 1
        cnt = num_tokens_from_string(txt_)
        chunk.append(txt)
        tk_cnt += cnt
    if chunk: add_chunk()

    for i, d in enumerate(res):
        print(d)
        # d["image"].save(f"./logs/{i}.jpg")
    return res


if __name__ == "__main__":
    import sys
    def dummy(prog=None, msg=""):
        pass
    chunk(sys.argv[1], callback=dummy)