James R. Barlow
1cb5f6a90d
Some versions of tesseract installed by homebrew end up without a functional tessdata folder, and tesseract is not helpful in this situation, so add a new test to make sure our output is at least indicative of the problem. In the process of properly handling return codes I discovered test_override_metadata triggers a NPE inside JHOVE probably due to the Unicode character checking. This could be specific to my JRE (1.6.0_65, Oracle) but it's probably JHOVE's fault. A valid PDF/A (per Acrobat) is still generated.
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
#!/usr/bin/env python3
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# © 2015 James R. Barlow: github.com/jbarlow83
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from subprocess import STDOUT, CalledProcessError, check_output
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import sys
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import os
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import re
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from functools import lru_cache
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from . import ExitCode
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@lru_cache(maxsize=1)
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def version():
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args_tess = [
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'tesseract',
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'--version'
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]
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try:
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versions = check_output(
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args_tess, close_fds=True, universal_newlines=True,
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stderr=STDOUT)
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except CalledProcessError:
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print("Could not find Tesseract executable on system PATH.")
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sys.exit(ExitCode.missing_dependency)
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tesseract_version = re.match(r'tesseract\s(.+)', versions).group(1)
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return tesseract_version
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@lru_cache(maxsize=1)
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def languages():
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args_tess = [
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'tesseract',
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'--list-langs'
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]
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try:
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langs = check_output(
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args_tess, close_fds=True, universal_newlines=True,
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stderr=STDOUT)
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except CalledProcessError as e:
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print("Tesseract failed to report available languages.")
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print("Output from Tesseract:")
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print("-" * 40)
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print(e.output)
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sys.exit(ExitCode.missing_dependency)
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return set(lang.strip() for lang in langs.splitlines()[1:])
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HOCR_TEMPLATE = '''<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title></title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name='ocr-system' content='tesseract 3.02.02' />
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<meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
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</head>
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<body>
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<div class='ocr_page' id='page_1' title='image "x.tif"; bbox 0 0 {0} {1}; ppageno 0'>
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<div class='ocr_carea' id='block_1_1' title="bbox 0 1 {0} {1}">
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<p class='ocr_par' dir='ltr' id='par_1' title="bbox 0 1 {0} {1}">
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<span class='ocr_line' id='line_1' title="bbox 0 1 {0} {1}"><span class='ocrx_word' id='word_1' title="bbox 0 1 {0} {1}"> </span>
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</span>
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</p>
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</div>
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</div>
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</body>
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</html>'''
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