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converter.py
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#!/usr/bin/env python2
import sys
from pdfdevice import PDFTextDevice
from pdffont import PDFUnicodeNotDefined
from layout import LTContainer, LTPage, LTText, LTLine, LTRect, LTCurve
from layout import LTFigure, LTImage, LTChar, LTTextLine
from layout import LTTextBox, LTTextBoxVertical, LTTextGroup
from utils import apply_matrix_pt, mult_matrix
from utils import enc, bbox2str, bbox2dims
## PDFLayoutAnalyzer
##
class PDFLayoutAnalyzer(PDFTextDevice):
def __init__(self, rsrcmgr, pageno=1, laparams=None):
PDFTextDevice.__init__(self, rsrcmgr)
self.pageno = pageno
self.laparams = laparams
self._stack = []
return
def begin_page(self, page, ctm):
(x0, y0, x1, y1) = page.mediabox
(x0, y0) = apply_matrix_pt(ctm, (x0, y0))
(x1, y1) = apply_matrix_pt(ctm, (x1, y1))
mediabox = (0, 0, abs(x0 - x1), abs(y0 - y1))
self.cur_item = LTPage(self.pageno, mediabox)
return
def end_page(self, page):
assert not self._stack
assert isinstance(self.cur_item, LTPage)
if self.laparams is not None:
self.cur_item.analyze(self.laparams)
self.pageno += 1
self.receive_layout(self.cur_item)
return
def begin_figure(self, name, bbox, matrix):
self._stack.append(self.cur_item)
self.cur_item = LTFigure(name, bbox, mult_matrix(matrix, self.ctm))
return
def end_figure(self, _):
fig = self.cur_item
assert isinstance(self.cur_item, LTFigure)
self.cur_item = self._stack.pop()
self.cur_item.add(fig)
return
def render_image(self, name, stream):
assert isinstance(self.cur_item, LTFigure)
item = LTImage(name, stream,
(self.cur_item.x0, self.cur_item.y0,
self.cur_item.x1, self.cur_item.y1))
self.cur_item.add(item)
return
def paint_path(self, gstate, stroke, fill, evenodd, path):
shape = ''.join(x[0] for x in path)
if shape == 'ml':
# horizontal/vertical line
(_, x0, y0) = path[0]
(_, x1, y1) = path[1]
(x0, y0) = apply_matrix_pt(self.ctm, (x0, y0))
(x1, y1) = apply_matrix_pt(self.ctm, (x1, y1))
if x0 == x1 or y0 == y1:
self.cur_item.add(LTLine(gstate.linewidth, (x0, y0), (x1, y1)))
return
if shape == 'mlllh':
# rectangle
(_, x0, y0) = path[0]
(_, x1, y1) = path[1]
(_, x2, y2) = path[2]
(_, x3, y3) = path[3]
(x0, y0) = apply_matrix_pt(self.ctm, (x0, y0))
(x1, y1) = apply_matrix_pt(self.ctm, (x1, y1))
(x2, y2) = apply_matrix_pt(self.ctm, (x2, y2))
(x3, y3) = apply_matrix_pt(self.ctm, (x3, y3))
if ((x0 == x1 and y1 == y2 and x2 == x3 and y3 == y0) or
(y0 == y1 and x1 == x2 and y2 == y3 and x3 == x0)):
self.cur_item.add(LTRect(gstate.linewidth, (x0, y0, x2, y2)))
return
# other shapes
pts = []
for p in path:
for i in xrange(1, len(p), 2):
pts.append(apply_matrix_pt(self.ctm, (p[i], p[i + 1])))
self.cur_item.add(LTCurve(gstate.linewidth, pts))
return
def render_char(self, matrix, font, fontsize, scaling, rise, cid):
try:
text = font.to_unichr(cid)
assert isinstance(text, unicode), text
except PDFUnicodeNotDefined:
text = self.handle_undefined_char(font, cid)
textwidth = font.char_width(cid)
textdisp = font.char_disp(cid)
item = LTChar(matrix, font, fontsize, scaling, rise, text, textwidth, textdisp)
self.cur_item.add(item)
return item.adv
def handle_undefined_char(self, font, cid):
if self.debug:
print >> sys.stderr, 'undefined: %r, %r' % (font, cid)
return '(cid:%d)' % cid
def receive_layout(self, ltpage):
return
## PDFPageAggregator
##
class PDFPageAggregator(PDFLayoutAnalyzer):
def __init__(self, rsrcmgr, pageno=1, laparams=None):
PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
self.result = None
return
def receive_layout(self, ltpage):
self.result = ltpage
return
def get_result(self):
return self.result
## PDFConverter
##
class PDFConverter(PDFLayoutAnalyzer):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None):
PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
self.outfp = outfp
self.codec = codec
return
## TextConverter
##
class TextConverter(PDFConverter):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None,
showpageno=False, imagewriter=None):
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.showpageno = showpageno
self.imagewriter = imagewriter
return
def write_text(self, text):
self.outfp.write(text.encode(self.codec, 'ignore'))
return
def receive_layout(self, ltpage):
def render(item):
if isinstance(item, LTContainer):
for child in item:
render(child)
elif isinstance(item, LTText):
self.write_text(item.get_text())
if isinstance(item, LTTextBox):
self.write_text('\n')
elif isinstance(item, LTImage):
if self.imagewriter is not None:
self.imagewriter.export_image(item)
if self.showpageno:
self.write_text('Page %s\n' % ltpage.pageid)
render(ltpage)
self.write_text('\f')
return
# Some dummy functions to save memory/CPU when all that is wanted
# is text. This stops all the image and drawing ouput from being
# recorded and taking up RAM.
def render_image(self, name, stream):
if self.imagewriter is None:
return
PDFConverter.render_image(self, name, stream)
return
def paint_path(self, gstate, stroke, fill, evenodd, path):
return
## HTMLConverter
##
class HTMLConverter(PDFConverter):
RECT_COLORS = {
#'char': 'green',
'figure': 'yellow',
'textline': 'magenta',
'textbox': 'cyan',
'textgroup': 'red',
'curve': 'black',
'page': 'gray',
}
TEXT_COLORS = {
'textbox': 'blue',
'char': 'black',
}
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None, scale=1, fontscale=0.7,
layoutmode='normal', showpageno=True, pagemargin=50, imagewriter=None, rect_colors=None,
text_colors=None):
if not text_colors:
text_colors = {'char': 'black'}
if not rect_colors:
rect_colors = {'curve': 'black', 'page': 'gray'}
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.scale = scale
self.fontscale = fontscale
self.layoutmode = layoutmode
self.showpageno = showpageno
self.pagemargin = pagemargin
self.imagewriter = imagewriter
self.rect_colors = rect_colors
self.text_colors = text_colors
if self.debug:
self.rect_colors.update(self.RECT_COLORS)
self.text_colors.update(self.TEXT_COLORS)
self._yoffset = self.pagemargin
self._font = None
self._fontstack = []
self.write_header()
return
def write(self, text):
self.outfp.write(text)
return
def write_header(self):
self.write('<html><head>\n')
self.write('<meta http-equiv="Content-Type" content="text/html; charset=%s">\n' % self.codec)
self.write('</head><body>\n')
return
def write_footer(self):
self.write('<div style="position:absolute; top:0px;">Page: %s</div>\n' %
', '.join('<a href="#%s">%s</a>' % (i, i) for i in xrange(1, self.pageno)))
self.write('</body></html>\n')
return
def write_text(self, text):
self.write(enc(text, self.codec))
return
def place_rect(self, color, borderwidth, x, y, w, h):
color = self.rect_colors.get(color)
if color is not None:
self.write('<span style="position:absolute; border: %s %dpx solid; '
'left:%dpx; top:%dpx; width:%dpx; height:%dpx;"></span>\n' %
(color, borderwidth,
x * self.scale, (self._yoffset - y) * self.scale,
w * self.scale, h * self.scale))
return
def place_border(self, color, borderwidth, item):
self.place_rect(color, borderwidth, item.x0, item.y1, item.width, item.height)
return
def place_image(self, item, borderwidth, x, y, w, h):
if self.imagewriter is not None:
name = self.imagewriter.export_image(item)
self.write('<img src="%s" border="%d" style="position:absolute; left:%dpx; top:%dpx;" '
'width="%d" height="%d" />\n' %
(enc(name), borderwidth,
x * self.scale, (self._yoffset - y) * self.scale,
w * self.scale, h * self.scale))
return
def place_text(self, color, text, x, y, size):
color = self.text_colors.get(color)
if color is not None:
self.write('<span style="position:absolute; color:%s; left:%dpx; top:%dpx; font-size:%dpx;">' %
(color, x * self.scale, (self._yoffset - y) * self.scale, size * self.scale * self.fontscale))
self.write_text(text)
self.write('</span>\n')
return
def begin_textbox(self, color, borderwidth, x, y, w, h, writing_mode):
self._fontstack.append(self._font)
self._font = None
self.write('<div style="position:absolute; border: %s %dpx solid; writing-mode:%s; '
'left:%dpx; top:%dpx; width:%dpx; height:%dpx;">' %
(color, borderwidth, writing_mode,
x * self.scale, (self._yoffset - y) * self.scale,
w * self.scale, h * self.scale))
return
def put_text(self, text, fontname, fontsize):
font = (fontname, fontsize)
if font != self._font:
if self._font is not None:
self.write('</span>')
self.write('<span style="font-family: %s; font-size:%dpx">' %
(fontname, fontsize * self.scale * self.fontscale))
self._font = font
self.write_text(text)
return
def put_newline(self):
self.write('<br>')
return
def end_textbox(self, color):
if self._font is not None:
self.write('</span>')
self._font = self._fontstack.pop()
self.write('</div>')
return
def receive_layout(self, ltpage):
def show_group(item):
if isinstance(item, LTTextGroup):
self.place_border('textgroup', 1, item)
for child in item:
show_group(child)
return
def render(item):
if isinstance(item, LTPage):
self._yoffset += item.y1
self.place_border('page', 1, item)
if self.showpageno:
self.write('<div style="position:absolute; top:%dpx;">' %
((self._yoffset - item.y1) * self.scale))
self.write('<a name="%s">Page %s</a></div>\n' % (item.pageid, item.pageid))
for child in item:
render(child)
if item.groups is not None:
for group in item.groups:
show_group(group)
elif isinstance(item, LTCurve):
self.place_border('curve', 1, item)
elif isinstance(item, LTFigure):
self.place_border('figure', 1, item)
for child in item:
render(child)
elif isinstance(item, LTImage):
self.place_image(item, 1, item.x0, item.y1, item.width, item.height)
else:
if self.layoutmode == 'exact':
if isinstance(item, LTTextLine):
self.place_border('textline', 1, item)
for child in item:
render(child)
elif isinstance(item, LTTextBox):
self.place_border('textbox', 1, item)
self.place_text('textbox', str(item.index + 1), item.x0, item.y1, 20)
for child in item:
render(child)
elif isinstance(item, LTChar):
self.place_border('char', 1, item)
self.place_text('char', item.get_text(), item.x0, item.y1, item.size)
else:
if isinstance(item, LTTextLine):
for child in item:
render(child)
if self.layoutmode != 'loose':
self.put_newline()
elif isinstance(item, LTTextBox):
self.begin_textbox('textbox', 1, item.x0, item.y1, item.width, item.height,
item.get_writing_mode())
for child in item:
render(child)
self.end_textbox('textbox')
elif isinstance(item, LTChar):
self.put_text(item.get_text(), item.fontname, item.size)
elif isinstance(item, LTText):
self.write_text(item.get_text())
return
render(ltpage)
self._yoffset += self.pagemargin
return
def close(self):
self.write_footer()
return
## XMLConverter
##
class XMLConverter(PDFConverter):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1,
laparams=None, imagewriter=None, layoutmode='exact', scale=1, roundCoords=False,
simplifyOutput=False):
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.scale = scale
self.imagewriter = imagewriter
self.write_header()
self.layoutmode = layoutmode
self.roundCoords = roundCoords
self.simplerOutput = simplifyOutput
self._yoffset = None
return
def scaled_bbox(self, item):
return 'bbox="%s" %s' % (
bbox2str(item.bbox, scale=self.scale, roundCoords=self.roundCoords, yOffset=self._yoffset),
bbox2dims(item.bbox, scale=self.scale, roundCoords=self.roundCoords, yOffset=self._yoffset))
def write_header(self):
self.outfp.write('<?xml version="1.0" encoding="%s" ?>\n' % self.codec)
self.outfp.write('<pages>\n')
return
def write_footer(self):
self.outfp.write('</pages>\n')
return
def write_text(self, text):
self.outfp.write(enc(text, self.codec))
return
def receive_layout(self, ltpage):
def show_group(item):
if self.simplerOutput:
if isinstance(item, LTTextGroup):
for child in item:
show_group(child)
else:
if isinstance(item, LTTextBox):
self.outfp.write('<textbox id="%d" %s />\n' %
(item.index, self.scaled_bbox(item)))
elif isinstance(item, LTTextGroup):
self.outfp.write('<textgroup %s>\n' % (self.scaled_bbox(item)))
for child in item:
show_group(child)
self.outfp.write('</textgroup>\n')
def render(item):
if isinstance(item, LTPage):
# Get max Y coord
self._yoffset = item.y1
self.outfp.write('<page number="%s" id="%s" %s rotate="%d">\n' %
(item.pageid, item.pageid, self.scaled_bbox(item), item.rotate))
for child in item:
render(child)
if item.groups is not None:
if self.simplerOutput:
for group in item.groups:
show_group(group)
else:
self.outfp.write('<layout>\n')
for group in item.groups:
show_group(group)
self.outfp.write('</layout>\n')
self.outfp.write('</page>\n')
elif isinstance(item, LTLine):
self.outfp.write('<line linewidth="%d" %s />\n' %
(item.linewidth, self.scaled_bbox(item)))
elif isinstance(item, LTRect):
self.outfp.write('<rect linewidth="%d" %s />\n' %
(item.linewidth, self.scaled_bbox(item)))
elif isinstance(item, LTCurve):
self.outfp.write('<curve linewidth="%d" %s pts="%s" />\n' %
(item.linewidth, self.scaled_bbox(item), item.get_pts()))
elif isinstance(item, LTFigure):
self.outfp.write('<figure name="%s" %s>\n' %
(item.name, self.scaled_bbox(item)))
for child in item:
render(child)
self.outfp.write('</figure>\n')
elif isinstance(item, LTTextLine):
tagName = 'textline'
if self.simplerOutput:
tagName = 'text'
self.outfp.write('<%s %s>\n' % (tagName, self.scaled_bbox(item)))
for child in item:
render(child)
self.outfp.write('</%s>\n' % tagName)
elif isinstance(item, LTTextBox):
if self.simplerOutput:
for child in item:
render(child)
else:
wmode = ''
if isinstance(item, LTTextBoxVertical):
wmode = ' wmode="vertical"'
self.outfp.write('<textbox id="%d" %s %s>\n' %
(item.index, self.scaled_bbox(item), wmode))
for child in item:
render(child)
self.outfp.write('</textbox>\n')
elif isinstance(item, LTChar):
if self.layoutmode == 'exact':
self.outfp.write('<text font="%s" %s size="%.3f">' %
(enc(item.fontname), self.scaled_bbox(item), item.size))
self.write_text(item.get_text())
self.outfp.write('</text>\n')
else:
self.write_text(item.get_text())
elif isinstance(item, LTText):
if self.layoutmode == 'exact':
self.outfp.write('<text>%s</text>\n' % item.get_text())
else:
self.write_text(item.get_text())
elif isinstance(item, LTImage):
if self.imagewriter is not None:
name = self.imagewriter.export_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
return
render(ltpage)
return
def close(self):
self.write_footer()
return