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460 lines
18 KiB
460 lines
18 KiB
import os.path
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import logging
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from .pdfdevice import PDFTextDevice
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from .pdffont import PDFUnicodeNotDefined
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from .pdftypes import LITERALS_DCT_DECODE
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from .pdfcolor import LITERAL_DEVICE_GRAY, LITERAL_DEVICE_RGB
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from .layout import LTContainer, LTPage, LTText, LTLine, LTRect, LTCurve
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from .layout import LTFigure, LTImage, LTChar, LTTextLine
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from .layout import LTTextBox, LTTextBoxVertical, LTTextGroup
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from .utils import apply_matrix_pt, mult_matrix
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from .utils import htmlescape, bbox2str, create_bmp
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logger = logging.getLogger(__name__)
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class PDFLayoutAnalyzer(PDFTextDevice):
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def __init__(self, rsrcmgr, pageno=1, laparams=None):
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PDFTextDevice.__init__(self, rsrcmgr)
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self.pageno = pageno
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self.laparams = laparams
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self._stack = []
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def begin_page(self, page, ctm):
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(x0,y0,x1,y1) = page.mediabox
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(x0,y0) = apply_matrix_pt(ctm, (x0,y0))
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(x1,y1) = apply_matrix_pt(ctm, (x1,y1))
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mediabox = (0, 0, abs(x0-x1), abs(y0-y1))
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self.cur_item = LTPage(self.pageno, mediabox)
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def end_page(self, page):
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assert not self._stack
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assert isinstance(self.cur_item, LTPage)
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if self.laparams is not None:
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self.cur_item.analyze(self.laparams)
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self.pageno += 1
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self.receive_layout(self.cur_item)
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def begin_figure(self, name, bbox, matrix):
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self._stack.append(self.cur_item)
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self.cur_item = LTFigure(name, bbox, mult_matrix(matrix, self.ctm))
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def end_figure(self, _):
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fig = self.cur_item
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assert isinstance(self.cur_item, LTFigure)
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self.cur_item = self._stack.pop()
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self.cur_item.add(fig)
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def render_image(self, name, stream):
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assert isinstance(self.cur_item, LTFigure)
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item = LTImage(name, stream,
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(self.cur_item.x0, self.cur_item.y0,
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self.cur_item.x1, self.cur_item.y1))
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self.cur_item.add(item)
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def paint_path(self, gstate, stroke, fill, evenodd, path):
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shape = ''.join(x[0] for x in path)
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if shape == 'ml':
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# horizontal/vertical line
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(_,x0,y0) = path[0]
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(_,x1,y1) = path[1]
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(x0,y0) = apply_matrix_pt(self.ctm, (x0,y0))
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(x1,y1) = apply_matrix_pt(self.ctm, (x1,y1))
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if x0 == x1 or y0 == y1:
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self.cur_item.add(LTLine(gstate.linewidth, (x0,y0), (x1,y1)))
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return
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if shape == 'mlllh':
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# rectangle
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(_,x0,y0) = path[0]
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(_,x1,y1) = path[1]
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(_,x2,y2) = path[2]
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(_,x3,y3) = path[3]
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(x0,y0) = apply_matrix_pt(self.ctm, (x0,y0))
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(x1,y1) = apply_matrix_pt(self.ctm, (x1,y1))
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(x2,y2) = apply_matrix_pt(self.ctm, (x2,y2))
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(x3,y3) = apply_matrix_pt(self.ctm, (x3,y3))
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if ((x0 == x1 and y1 == y2 and x2 == x3 and y3 == y0) or
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(y0 == y1 and x1 == x2 and y2 == y3 and x3 == x0)):
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self.cur_item.add(LTRect(gstate.linewidth, (x0,y0,x2,y2)))
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return
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# other shapes
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pts = []
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for p in path:
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for i in range(1, len(p), 2):
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pts.append(apply_matrix_pt(self.ctm, (p[i], p[i+1])))
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self.cur_item.add(LTCurve(gstate.linewidth, pts))
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def render_char(self, matrix, font, fontsize, scaling, rise, cid):
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try:
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text = font.to_unichr(cid)
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assert isinstance(text, str), text
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except PDFUnicodeNotDefined:
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text = self.handle_undefined_char(font, cid)
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textwidth = font.char_width(cid)
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textdisp = font.char_disp(cid)
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item = LTChar(matrix, font, fontsize, scaling, rise, text, textwidth, textdisp)
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self.cur_item.add(item)
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return item.adv
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def handle_undefined_char(self, font, cid):
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logger.warning('undefined: %r, %r', font, cid)
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return '(cid:%d)' % cid
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def receive_layout(self, ltpage):
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pass
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class PDFPageAggregator(PDFLayoutAnalyzer):
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def __init__(self, rsrcmgr, pageno=1, laparams=None):
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PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
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self.result = None
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def receive_layout(self, ltpage):
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self.result = ltpage
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def get_result(self):
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return self.result
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## PDFConverter
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##
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class PDFConverter(PDFLayoutAnalyzer):
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# outfp is an fp opened in *text* mode
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def __init__(self, rsrcmgr, outfp, pageno=1, laparams=None):
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PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
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self.outfp = outfp
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def write_image(self, image):
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stream = image.stream
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filters = stream.get_filters()
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if len(filters) == 1 and filters[0] in LITERALS_DCT_DECODE:
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ext = '.jpg'
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data = stream.get_rawdata()
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elif image.colorspace is LITERAL_DEVICE_RGB:
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ext = '.bmp'
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data = create_bmp(stream.get_data(), stream.bits*3, image.width, image.height)
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elif image.colorspace is LITERAL_DEVICE_GRAY:
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ext = '.bmp'
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data = create_bmp(stream.get_data(), stream.bits, image.width, image.height)
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else:
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ext = '.img'
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data = stream.get_data()
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name = image.name+ext
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path = os.path.join(self.outdir, name)
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fp = file(path, 'wb')
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fp.write(data)
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fp.close()
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return name
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## TextConverter
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##
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class TextConverter(PDFConverter):
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def __init__(self, rsrcmgr, outfp, pageno=1, laparams=None,
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showpageno=False):
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PDFConverter.__init__(self, rsrcmgr, outfp, pageno=pageno, laparams=laparams)
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self.showpageno = showpageno
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def write_text(self, text):
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self.outfp.write(text)
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def receive_layout(self, ltpage):
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def render(item):
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if isinstance(item, LTContainer):
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for child in item:
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render(child)
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elif isinstance(item, LTText):
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self.write_text(item.get_text())
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if isinstance(item, LTTextBox):
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self.write_text('\n')
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if self.showpageno:
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self.write_text('Page %s\n' % ltpage.pageid)
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render(ltpage)
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self.write_text('\f')
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# Some dummy functions to save memory/CPU when all that is wanted is text.
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# This stops all the image and drawing ouput from being recorded and taking
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# up RAM.
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def render_image(self, name, stream):
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pass
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def paint_path(self, gstate, stroke, fill, evenodd, path):
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pass
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## HTMLConverter
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##
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class HTMLConverter(PDFConverter):
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RECT_COLORS = {
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#'char': 'green',
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'figure': 'yellow',
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'textline': 'magenta',
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'textbox': 'cyan',
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'textgroup': 'red',
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'curve': 'black',
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'page': 'gray',
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}
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TEXT_COLORS = {
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'textbox': 'blue',
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'char': 'black',
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}
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def __init__(self, rsrcmgr, outfp, pageno=1, laparams=None,
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scale=1, fontscale=0.7, layoutmode='normal', showpageno=True,
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pagemargin=50, outdir=None,
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rect_colors={'curve':'black', 'page':'gray'},
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text_colors={'char':'black'},
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debug=False):
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PDFConverter.__init__(self, rsrcmgr, outfp, pageno=pageno, laparams=laparams)
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self.scale = scale
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self.fontscale = fontscale
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self.layoutmode = layoutmode
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self.showpageno = showpageno
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self.pagemargin = pagemargin
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self.outdir = outdir
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self.rect_colors = rect_colors
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self.text_colors = text_colors
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if debug:
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self.rect_colors.update(self.RECT_COLORS)
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self.text_colors.update(self.TEXT_COLORS)
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self._yoffset = self.pagemargin
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self._font = None
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self._fontstack = []
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self.write_header()
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def write(self, text):
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self.outfp.write(text)
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def write_header(self):
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self.write('<html><head>\n')
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self.write('<meta http-equiv="Content-Type" content="text/html; charset=%s">\n' % self.outfp.encoding)
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self.write('</head><body>\n')
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def write_footer(self):
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self.write('<div style="position:absolute; top:0px;">Page: %s</div>\n' %
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', '.join('<a href="#%s">%s</a>' % (i,i) for i in range(1,self.pageno)))
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self.write('</body></html>\n')
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def write_text(self, text):
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self.write(htmlescape(text, self.outfp.encoding))
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def place_rect(self, color, borderwidth, x, y, w, h):
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color = self.rect_colors.get(color)
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if color is not None:
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self.write('<span style="position:absolute; border: %s %dpx solid; '
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'left:%dpx; top:%dpx; width:%dpx; height:%dpx;"></span>\n' %
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(color, borderwidth,
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x*self.scale, (self._yoffset-y)*self.scale,
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w*self.scale, h*self.scale))
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def place_border(self, color, borderwidth, item):
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self.place_rect(color, borderwidth, item.x0, item.y1, item.width, item.height)
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def place_image(self, item, borderwidth, x, y, w, h):
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if self.outdir is not None:
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name = self.write_image(item)
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self.write('<img src="%s" border="%d" style="position:absolute; left:%dpx; top:%dpx;" '
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'width="%d" height="%d" />\n' %
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(enc(name), borderwidth,
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x*self.scale, (self._yoffset-y)*self.scale,
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w*self.scale, h*self.scale))
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def place_text(self, color, text, x, y, size):
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color = self.text_colors.get(color)
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if color is not None:
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self.write('<span style="position:absolute; color:%s; left:%dpx; top:%dpx; font-size:%dpx;">' %
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(color, x*self.scale, (self._yoffset-y)*self.scale, size*self.scale*self.fontscale))
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self.write_text(text)
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self.write('</span>\n')
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def begin_textbox(self, color, borderwidth, x, y, w, h, writing_mode):
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self._fontstack.append(self._font)
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self._font = None
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self.write('<div style="position:absolute; border: %s %dpx solid; writing-mode:%s; '
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'left:%dpx; top:%dpx; width:%dpx; height:%dpx;">' %
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(color, borderwidth, writing_mode,
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x*self.scale, (self._yoffset-y)*self.scale,
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w*self.scale, h*self.scale))
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def put_text(self, text, fontname, fontsize):
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font = (fontname, fontsize)
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if font != self._font:
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if self._font is not None:
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self.write('</span>')
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self.write('<span style="font-family: %s; font-size:%dpx">' %
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(fontname, fontsize * self.scale * self.fontscale))
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self._font = font
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self.write_text(text)
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def put_newline(self):
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self.write('<br>')
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def end_textbox(self, color):
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if self._font is not None:
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self.write('</span>')
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self._font = self._fontstack.pop()
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self.write('</div>')
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def receive_layout(self, ltpage):
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def show_group(item):
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if isinstance(item, LTTextGroup):
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self.place_border('textgroup', 1, item)
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for child in item:
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show_group(child)
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def render(item):
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if isinstance(item, LTPage):
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self._yoffset += item.y1
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self.place_border('page', 1, item)
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if self.showpageno:
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self.write('<div style="position:absolute; top:%dpx;">' %
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((self._yoffset-item.y1)*self.scale))
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self.write('<a name="%s">Page %s</a></div>\n' % (item.pageid, item.pageid))
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for child in item:
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render(child)
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if item.groups is not None:
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for group in item.groups:
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show_group(group)
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elif isinstance(item, LTCurve):
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self.place_border('curve', 1, item)
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elif isinstance(item, LTFigure):
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self.place_border('figure', 1, item)
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for child in item:
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render(child)
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elif isinstance(item, LTImage):
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self.place_image(item, 1, item.x0, item.y1, item.width, item.height)
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else:
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if self.layoutmode == 'exact':
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if isinstance(item, LTTextLine):
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self.place_border('textline', 1, item)
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for child in item:
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render(child)
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elif isinstance(item, LTTextBox):
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self.place_border('textbox', 1, item)
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self.place_text('textbox', str(item.index+1), item.x0, item.y1, 20)
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for child in item:
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render(child)
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elif isinstance(item, LTChar):
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self.place_border('char', 1, item)
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self.place_text('char', item.get_text(), item.x0, item.y1, item.size)
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else:
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if isinstance(item, LTTextLine):
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for child in item:
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render(child)
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if self.layoutmode != 'loose':
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self.put_newline()
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elif isinstance(item, LTTextBox):
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self.begin_textbox('textbox', 1, item.x0, item.y1, item.width, item.height,
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item.get_writing_mode())
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for child in item:
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render(child)
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self.end_textbox('textbox')
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elif isinstance(item, LTChar):
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self.put_text(item.get_text(), item.fontname, item.size)
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elif isinstance(item, LTText):
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self.write_text(item.get_text())
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render(ltpage)
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self._yoffset += self.pagemargin
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def close(self):
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self.write_footer()
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class XMLConverter(PDFConverter):
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def __init__(self, rsrcmgr, outfp, pageno=1, laparams=None, outdir=None):
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PDFConverter.__init__(self, rsrcmgr, outfp, pageno=pageno, laparams=laparams)
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self.outdir = outdir
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self.write_header()
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def write_header(self):
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self.outfp.write('<?xml version="1.0" encoding="%s" ?>\n' % self.outfp.encoding)
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self.outfp.write('<pages>\n')
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def write_footer(self):
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self.outfp.write('</pages>\n')
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def write_text(self, text):
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self.outfp.write(htmlescape(text, self.outfp.encoding))
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def receive_layout(self, ltpage):
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def show_group(item):
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if isinstance(item, LTTextBox):
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self.outfp.write('<textbox id="%d" bbox="%s" />\n' %
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(item.index, bbox2str(item.bbox)))
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elif isinstance(item, LTTextGroup):
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self.outfp.write('<textgroup bbox="%s">\n' % bbox2str(item.bbox))
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for child in item:
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show_group(child)
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self.outfp.write('</textgroup>\n')
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def render(item):
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if isinstance(item, LTPage):
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self.outfp.write('<page id="%s" bbox="%s" rotate="%d">\n' %
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(item.pageid, bbox2str(item.bbox), item.rotate))
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for child in item:
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render(child)
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if item.groups is not None:
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self.outfp.write('<layout>\n')
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for group in item.groups:
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show_group(group)
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self.outfp.write('</layout>\n')
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self.outfp.write('</page>\n')
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elif isinstance(item, LTLine):
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self.outfp.write('<line linewidth="%d" bbox="%s" />\n' %
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(item.linewidth, bbox2str(item.bbox)))
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elif isinstance(item, LTRect):
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self.outfp.write('<rect linewidth="%d" bbox="%s" />\n' %
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(item.linewidth, bbox2str(item.bbox)))
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elif isinstance(item, LTCurve):
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self.outfp.write('<curve linewidth="%d" bbox="%s" pts="%s"/>\n' %
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(item.linewidth, bbox2str(item.bbox), item.get_pts()))
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elif isinstance(item, LTFigure):
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self.outfp.write('<figure name="%s" bbox="%s">\n' %
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(item.name, bbox2str(item.bbox)))
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for child in item:
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render(child)
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self.outfp.write('</figure>\n')
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elif isinstance(item, LTTextLine):
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self.outfp.write('<textline bbox="%s">\n' % bbox2str(item.bbox))
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for child in item:
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render(child)
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self.outfp.write('</textline>\n')
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elif isinstance(item, LTTextBox):
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wmode = ''
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if isinstance(item, LTTextBoxVertical):
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wmode = ' wmode="vertical"'
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self.outfp.write('<textbox id="%d" bbox="%s"%s>\n' %
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(item.index, bbox2str(item.bbox), wmode))
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for child in item:
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render(child)
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self.outfp.write('</textbox>\n')
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elif isinstance(item, LTChar):
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self.outfp.write('<text font="%s" bbox="%s" size="%.3f">' %
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(htmlescape(item.fontname), bbox2str(item.bbox), item.size))
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self.write_text(item.get_text())
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self.outfp.write('</text>\n')
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elif isinstance(item, LTText):
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self.outfp.write('<text>%s</text>\n' % item.get_text())
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elif isinstance(item, LTImage):
|
|
if self.outdir:
|
|
name = self.write_image(item)
|
|
self.outfp.write('<image src="%s" width="%d" height="%d" />\n' %
|
|
(enc(name), item.width, item.height))
|
|
else:
|
|
self.outfp.write('<image width="%d" height="%d" />\n' %
|
|
(item.width, item.height))
|
|
else:
|
|
assert 0, item
|
|
|
|
render(ltpage)
|
|
|
|
def close(self):
|
|
self.write_footer()
|