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pdfminer_pattern.Rmd
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pdfminer_pattern.Rmd
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---
jupyter:
jupytext:
text_representation:
extension: .Rmd
format_name: rmarkdown
format_version: '1.2'
jupytext_version: 1.11.2
kernelspec:
display_name: Python 3
language: python
name: python3
---
```{python active="", eval=FALSE}
!pip install pdfminer
```
```{python}
# warning: pdfminer uses python 2
from __future__ import division
```
```{python}
example_file = r"C:\Users\David Gloyn-Cox\Dropbox\personal\accounts\bank\downloads\statement-5813532321604827-18Jul01.pdf"
example_file = r"D:\users\David\Dropbox\personal\accounts\2021\RBC\00750XXX9146-2021Feb09-2021Mar09.pdf"
example_file = r"D:\users\David\Dropbox\personal\accounts\2021\TD\2021-01-06_TD_BUSINESS_TRAVEL_VISA_7439.pdf"
```
```{python}
from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdfpage import PDFPage
from pdfminer.pdfpage import PDFTextExtractionNotAllowed
from pdfminer.pdfinterp import PDFResourceManager
from pdfminer.pdfinterp import PDFPageInterpreter
from pdfminer.layout import LAParams
from pdfminer.converter import PDFPageAggregator
def extract_layout_by_page(pdf_path):
"""
Extracts LTPage objects from a pdf file.
slightly modified from
https://euske.github.io/pdfminer/programming.html
"""
laparams = LAParams()
fp = open(pdf_path, 'rb')
parser = PDFParser(fp)
document = PDFDocument(parser)
if not document.is_extractable:
raise PDFTextExtractionNotAllowed
rsrcmgr = PDFResourceManager()
device = PDFPageAggregator(rsrcmgr, laparams=laparams)
interpreter = PDFPageInterpreter(rsrcmgr, device)
layouts = []
for page in PDFPage.create_pages(document):
interpreter.process_page(page)
layouts.append(device.get_result())
return layouts
page_layouts = extract_layout_by_page(example_file)
```
```{python}
len(page_layouts)
```
```{python}
objects_on_page = set(type(o) for o in page_layouts[0])
objects_on_page
```
```{python}
import pdfminer
TEXT_ELEMENTS = [
pdfminer.layout.LTTextBox,
pdfminer.layout.LTTextBoxHorizontal,
pdfminer.layout.LTTextLine,
pdfminer.layout.LTTextLineHorizontal
]
def flatten(lst):
"""Flattens a list of lists"""
return [subelem for elem in lst for subelem in elem]
def extract_characters(element):
"""
Recursively extracts individual characters from
text elements.
"""
if isinstance(element, pdfminer.layout.LTChar):
return [element]
if any(isinstance(element, i) for i in TEXT_ELEMENTS):
return flatten([extract_characters(e) for e in element])
if isinstance(element, list):
return flatten([extract_characters(l) for l in element])
return []
```
```{python}
current_page = page_layouts[0]
texts = []
rects = []
# seperate text and rectangle elements
for e in current_page:
if isinstance(e, pdfminer.layout.LTTextBoxHorizontal):
texts.append(e)
elif isinstance(e, pdfminer.layout.LTRect):
rects.append(e)
# sort them into
characters = extract_characters(texts)
if isinstance(characters, list):
print("characters: {}".format(len(characters)))
else:
print(type(characters))
```
```{python}
import matplotlib.pyplot as plt
from matplotlib import patches
# %matplotlib inline
def draw_rect_bbox(bbox, ax, color):
"""
Draws an unfilled rectable onto ax.
"""
x0,y0,x1,y1 = bbox
ax.add_patch(
patches.Rectangle(
(x0, y0),
x1 - x0,
y1 - y0,
fill=False,
color=color
)
)
def draw_rect(rect, ax, color="black"):
draw_rect_bbox(rect.bbox, ax, color)
```
```{python}
xmin, ymin, xmax, ymax = current_page.bbox
size = 6
fig, ax = plt.subplots(figsize = (size, size * (ymax/xmax)))
for rect in rects:
draw_rect(rect, ax)
for c in characters:
draw_rect(c, ax, "red")
plt.xlim(xmin, xmax)
plt.ylim(ymin, ymax)
plt.show()
```
```{python}
```