Function make_textline

src/__main__.py:687–738

Produce the text of one output line. Args: left: (float) left most coordinate used on page slot: (float) avg width of one character in any font in use. minslot: (float) min width for the characters in this line. chars: (list[tuple]) characters

(left, slot, minslot, lchars)

    # --------------------------------------------------------------------
    def make_textline(left, slot, minslot, lchars):
        """Produce the text of one output line.

        Args:
            left: (float) left most coordinate used on page
            slot: (float) avg width of one character in any font in use.
            minslot: (float) min width for the characters in this line.
            chars: (list[tuple]) characters of this line.
        Returns:
            text: (str) text string for this line
        """
        text = ""  # we output this
        old_char = ""
        old_x1 = 0  # end coordinate of last char
        old_ox = 0  # x-origin of last char
        if minslot <= pymupdf.EPSILON:
            raise RuntimeError(f"program error: minslot too small = {minslot:g}")

        for c in lchars:  # loop over characters
            char, ox, _, cwidth = c
            ox = ox - left  # its (relative) start coordinate
            x1 = ox + cwidth  # ending coordinate

            # eliminate overprint effect
            if old_char == char and ox - old_ox <= cwidth * 0.2:
                continue

            # omit spaces overlapping previous char
            if char == " " and (old_x1 - ox) / cwidth > 0.8:
                continue

            old_char = char
            # close enough to previous?
            if ox < old_x1 + minslot:  # assume char adjacent to previous
                text += char  # append to output
                old_x1 = x1  # new end coord
                old_ox = ox  # new origin.x
                continue

            # else next char starts after some gap:
            # fill in right number of spaces, so char is positioned
            # in the right slot of the line
            if char == " ":  # rest relevant for non-space only
                continue
            delta = int(ox / slot) - len(text)
            if ox > old_x1 and delta > 1:
                text += " " * delta
            # now append char
            text += char
            old_x1 = x1  # new end coordinate
            old_ox = ox  # new origin
        return text.rstrip()

    # extract page text by single characters ("rawdict")
    blocks = page.get_text("rawdict", flags=flags)["blocks"]