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bbd263ff48
- Add hOCR test fixtures for Latin, Arabic, CJK, Devanagari scripts - Add tests for fpdf2 renderer, multi-font manager, system font provider - Add multilingual rendering tests - Update existing tests to use fpdf2 renderer
551 lines
19 KiB
Python
551 lines
19 KiB
Python
#!/usr/bin/env python3
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# SPDX-FileCopyrightText: 2025 James R. Barlow
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# SPDX-License-Identifier: MPL-2.0
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"""Direct tests for multilingual text rendering with fpdf2 renderer.
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This tests the fpdf2 renderer with various language groups:
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- Latin (English, French, German with diacritics)
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- Arabic (Arabic, Persian - RTL scripts)
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- CJK (Chinese Simplified/Traditional, Japanese, Korean)
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- Devanagari (Hindi, Sanskrit)
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"""
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import subprocess
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from pathlib import Path
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import pytest
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from ocrmypdf.font import MultiFontManager
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from ocrmypdf.fpdf_renderer import DebugRenderOptions, Fpdf2PdfRenderer
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from ocrmypdf.hocrtransform.hocr_parser import HocrParser
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RESOURCES = Path(__file__).parent / "resources"
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@pytest.fixture
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def font_dir():
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"""Return path to font directory."""
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return Path(__file__).parent.parent / "src" / "ocrmypdf" / "data"
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@pytest.fixture
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def multi_font_manager(font_dir):
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"""Create MultiFontManager instance for testing."""
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return MultiFontManager(font_dir)
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# =============================================================================
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# Latin Script Tests
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# =============================================================================
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class TestLatinScript:
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"""Tests for Latin script (English, French, German, etc.)."""
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@pytest.fixture
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def latin_hocr(self):
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"""Return path to Latin HOCR test file."""
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return RESOURCES / "latin.hocr"
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def test_render_latin_basic(self, latin_hocr, multi_font_manager, tmp_path):
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"""Test rendering Latin script with various diacritics."""
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parser = HocrParser(latin_hocr)
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page = parser.parse()
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assert page is not None
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paras = list(page.paragraphs)
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assert len(paras) == 3 # English, French, German
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# Check languages
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assert paras[0].language == 'eng'
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assert paras[1].language == 'fra'
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assert paras[2].language == 'deu'
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# Render to PDF
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output_pdf = tmp_path / "latin_output.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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# Extract text and verify
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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# English words
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assert 'quick' in text or 'brown' in text or 'fox' in text
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# French with diacritics
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assert 'Café' in text or 'résumé' in text or 'naïve' in text
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# German with umlauts and eszett
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assert 'Größe' in text or 'Zürich' in text or 'Ärger' in text
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def test_latin_font_selection(self, latin_hocr, multi_font_manager):
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"""Test that NotoSans is selected for Latin text."""
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parser = HocrParser(latin_hocr)
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page = parser.parse()
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for line in page.lines:
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for word in line.children:
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if word.text:
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font = multi_font_manager.select_font_for_word(
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word.text, line.language
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)
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assert font is not None
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# Latin text should use NotoSans-Regular
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assert multi_font_manager.has_all_glyphs(
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'NotoSans-Regular', word.text
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)
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# =============================================================================
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# Arabic Script Tests
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# =============================================================================
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class TestArabicScript:
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"""Tests for Arabic script (Arabic, Persian, etc.)."""
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@pytest.fixture
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def arabic_hocr(self):
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"""Return path to Arabic HOCR test file."""
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return RESOURCES / "arabic.hocr"
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def test_render_arabic_basic(self, arabic_hocr, multi_font_manager, tmp_path):
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"""Test rendering Arabic script text."""
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parser = HocrParser(arabic_hocr)
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page = parser.parse()
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assert page is not None
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paras = list(page.paragraphs)
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assert len(paras) == 3 # Arabic paragraphs and Persian
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# Render to PDF
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output_pdf = tmp_path / "arabic_output.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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# Extract text and verify Arabic content
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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# Arabic words: مرحبا بالعالم (Hello world)
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assert 'مرحبا' in text or 'بالعالم' in text
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# هذا نص عربي (This is Arabic text)
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assert 'عربي' in text or 'نص' in text
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def test_arabic_font_selection(self, arabic_hocr, multi_font_manager):
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"""Test that NotoSansArabic is selected for Arabic text."""
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parser = HocrParser(arabic_hocr)
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page = parser.parse()
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for line in page.lines:
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for word in line.children:
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if word.text and line.language in ('ara', 'per'):
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font = multi_font_manager.select_font_for_word(
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word.text, line.language
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)
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assert font is not None
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# Arabic text should use NotoSansArabic
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assert multi_font_manager.has_all_glyphs(
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'NotoSansArabic-Regular', word.text
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), f"NotoSansArabic cannot render '{word.text}'"
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def test_arabic_rtl_handling(self, arabic_hocr):
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"""Test that RTL direction is correctly parsed from hOCR."""
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parser = HocrParser(arabic_hocr)
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page = parser.parse()
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for para in page.paragraphs:
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if para.language in ('ara', 'per'):
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# Arabic paragraphs should have RTL direction
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assert para.direction == 'rtl', \
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"Arabic paragraph should have RTL direction"
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# =============================================================================
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# CJK Script Tests
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# =============================================================================
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def _cjk_font_works(multi_font_manager) -> bool:
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"""Check if CJK font is working (not corrupted)."""
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return multi_font_manager.has_all_glyphs('NotoSansCJK-Regular', '你')
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class TestCJKScript:
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"""Tests for CJK scripts (Chinese, Japanese, Korean)."""
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@pytest.fixture
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def cjk_hocr(self):
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"""Return path to CJK HOCR test file."""
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return RESOURCES / "cjk.hocr"
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def test_render_cjk_basic(self, cjk_hocr, multi_font_manager, tmp_path):
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"""Test rendering CJK script text."""
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if not _cjk_font_works(multi_font_manager):
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pytest.skip("CJK font not available or corrupted")
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parser = HocrParser(cjk_hocr)
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page = parser.parse()
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assert page is not None
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paras = list(page.paragraphs)
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assert len(paras) == 4 # Chinese Simplified, Traditional, Japanese, Korean
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# Check languages
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languages = [p.language for p in paras]
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assert 'chi_sim' in languages
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assert 'chi_tra' in languages
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assert 'jpn' in languages
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assert 'kor' in languages
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# Render to PDF
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output_pdf = tmp_path / "cjk_output.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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# Extract text and verify CJK content
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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# Chinese: 你好 世界 (Hello world)
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assert '你好' in text or '世界' in text
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# Japanese: こんにちは (Hello)
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assert 'こんにちは' in text or '世界' in text
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# Korean: 안녕하세요 (Hello)
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assert '안녕하세요' in text or '세계' in text
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def test_cjk_font_selection(self, cjk_hocr, multi_font_manager):
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"""Test that NotoSansCJK is selected for CJK text."""
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if not _cjk_font_works(multi_font_manager):
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pytest.skip("CJK font not available or corrupted")
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parser = HocrParser(cjk_hocr)
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page = parser.parse()
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cjk_languages = {'chi_sim', 'chi_tra', 'jpn', 'kor', 'zho', 'chi'}
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for line in page.lines:
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for word in line.children:
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if word.text and line.language in cjk_languages:
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font = multi_font_manager.select_font_for_word(
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word.text, line.language
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)
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assert font is not None
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# CJK text should use NotoSansCJK
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assert multi_font_manager.has_all_glyphs(
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'NotoSansCJK-Regular', word.text
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), f"NotoSansCJK cannot render '{word.text}'"
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# =============================================================================
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# Devanagari Script Tests
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# =============================================================================
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class TestDevanagariScript:
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"""Tests for Devanagari script (Hindi, Sanskrit, etc.)."""
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@pytest.fixture
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def devanagari_hocr(self):
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"""Return path to Devanagari HOCR test file."""
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return RESOURCES / "devanagari.hocr"
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def test_render_devanagari_basic(
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self, devanagari_hocr, multi_font_manager, tmp_path
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):
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"""Test rendering Devanagari script text."""
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parser = HocrParser(devanagari_hocr)
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page = parser.parse()
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assert page is not None
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paras = list(page.paragraphs)
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assert len(paras) == 3 # Hindi paragraphs and Sanskrit
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# Render to PDF
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output_pdf = tmp_path / "devanagari_output.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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# Extract text and verify Devanagari content
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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# Hindi: नमस्ते दुनिया (Hello world)
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assert 'नमस्ते' in text or 'दुनिया' in text
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# यह हिंदी पाठ है (This is Hindi text)
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assert 'हिंदी' in text or 'पाठ' in text
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def test_devanagari_font_selection(self, devanagari_hocr, multi_font_manager):
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"""Test that NotoSansDevanagari is selected for Devanagari text."""
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parser = HocrParser(devanagari_hocr)
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page = parser.parse()
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devanagari_languages = {'hin', 'san', 'mar', 'nep'}
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for line in page.lines:
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for word in line.children:
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if word.text and line.language in devanagari_languages:
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font = multi_font_manager.select_font_for_word(
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word.text, line.language
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)
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assert font is not None
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# Devanagari text should use NotoSansDevanagari
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assert multi_font_manager.has_all_glyphs(
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'NotoSansDevanagari-Regular', word.text
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), f"NotoSansDevanagari cannot render '{word.text}'"
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# =============================================================================
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# Mixed Language / Multilingual Tests
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# =============================================================================
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class TestMultilingual:
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"""Tests for mixed-language documents."""
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@pytest.fixture
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def multilingual_hocr(self):
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"""Return path to multilingual HOCR test file."""
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return RESOURCES / "multilingual.hocr"
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def test_render_multilingual_hocr_basic(
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self, multilingual_hocr, multi_font_manager, tmp_path
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):
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"""Test rendering multilingual HOCR file with English and Arabic text."""
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parser = HocrParser(multilingual_hocr)
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page = parser.parse()
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assert page is not None
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assert len(list(page.paragraphs)) == 2 # English and Arabic paragraphs
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# Check languages
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paras = list(page.paragraphs)
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assert paras[0].language == 'eng'
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assert paras[1].language == 'ara'
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# Render to PDF
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output_pdf = tmp_path / "multilingual_output.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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# Extract text from PDF
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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# Verify both English and Arabic text are present
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assert 'English' in text or 'Text' in text or 'Here' in text
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# Arabic text: مرحبا بك
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assert 'مرحبا' in text or 'بك' in text
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def test_render_multilingual_with_debug_options(
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self, multilingual_hocr, multi_font_manager, tmp_path
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):
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"""Test rendering with debug visualization enabled."""
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parser = HocrParser(multilingual_hocr)
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page = parser.parse()
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# Render with debug options
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output_pdf = tmp_path / "multilingual_debug.pdf"
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debug_options = DebugRenderOptions(
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render_baseline=True,
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render_line_bbox=True,
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render_word_bbox=True,
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)
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=False,
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debug_render_options=debug_options,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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assert output_pdf.stat().st_size > 0
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def test_multilingual_invisible_text(
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self, multilingual_hocr, multi_font_manager, tmp_path
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):
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"""Test rendering with invisible text (default OCR mode)."""
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parser = HocrParser(multilingual_hocr)
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page = parser.parse()
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# Render with invisible text (standard for OCR layer)
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output_pdf = tmp_path / "multilingual_invisible.pdf"
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renderer = Fpdf2PdfRenderer(
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page=page,
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dpi=300.0,
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multi_font_manager=multi_font_manager,
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invisible_text=True,
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)
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renderer.render(output_pdf)
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assert output_pdf.exists()
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# Text should still be extractable even though invisible
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text = subprocess.check_output(['pdftotext', str(output_pdf), '-'], text=True)
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assert len(text.strip()) > 0
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def test_multilingual_font_selection(self, multilingual_hocr, multi_font_manager):
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"""Test that correct fonts are selected for each language."""
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parser = HocrParser(multilingual_hocr)
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page = parser.parse()
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# Get all words
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words = []
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for line in page.lines:
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for word in line.children:
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if word.text:
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words.append((word.text, line.language))
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# Verify we have both English and Arabic words
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eng_words = [w for w, lang in words if lang == 'eng']
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ara_words = [w for w, lang in words if lang == 'ara']
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assert len(eng_words) > 0, "Should have English words"
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assert len(ara_words) > 0, "Should have Arabic words"
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# Test font selection
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for text, lang in words:
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font_mgr = multi_font_manager.select_font_for_word(text, lang)
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assert font_mgr is not None, f"No font selected for '{text}' ({lang})"
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if lang == 'ara':
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assert multi_font_manager.has_all_glyphs(
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'NotoSansArabic-Regular', text
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), f"NotoSansArabic cannot render '{text}'"
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# =============================================================================
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# Baseline and Structure Tests
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# =============================================================================
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class TestBaselineHandling:
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"""Tests for baseline and hOCR structure handling."""
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@pytest.fixture
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def multilingual_hocr(self):
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"""Return path to multilingual HOCR test file."""
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return RESOURCES / "multilingual.hocr"
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def test_multilingual_baseline_handling(self, multilingual_hocr):
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"""Test that baseline information is correctly parsed from hOCR."""
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parser = HocrParser(multilingual_hocr)
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page = parser.parse()
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for line in page.lines:
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if line.baseline:
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# Baseline should be reasonable
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assert -1.0 <= line.baseline.slope <= 1.0, \
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"Baseline slope should be reasonable"
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# =============================================================================
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# Font Coverage Tests
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# =============================================================================
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class TestFontCoverage:
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"""Tests verifying font coverage for various scripts."""
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def test_noto_sans_latin_coverage(self, multi_font_manager):
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"""Test NotoSans covers common Latin characters and diacritics."""
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latin_samples = [
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"Hello World",
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"Café résumé naïve",
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"Größe Zürich Ärger",
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"ÀÁÂÃÄÅÆÇÈÉÊË",
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"àáâãäåæçèéêë",
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]
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for sample in latin_samples:
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assert multi_font_manager.has_all_glyphs('NotoSans-Regular', sample), \
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f"NotoSans should cover: {sample}"
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def test_noto_sans_arabic_coverage(self, multi_font_manager):
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"""Test NotoSansArabic covers Arabic characters."""
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arabic_samples = [
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"مرحبا", # Hello
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"بالعالم", # World
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"العربية", # Arabic
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]
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for sample in arabic_samples:
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assert multi_font_manager.has_all_glyphs(
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'NotoSansArabic-Regular', sample
|
|
), f"NotoSansArabic should cover: {sample}"
|
|
|
|
def test_noto_sans_devanagari_coverage(self, multi_font_manager):
|
|
"""Test NotoSansDevanagari covers Devanagari characters."""
|
|
devanagari_samples = [
|
|
"नमस्ते", # Hello
|
|
"हिंदी", # Hindi
|
|
"संस्कृत", # Sanskrit
|
|
]
|
|
|
|
for sample in devanagari_samples:
|
|
assert multi_font_manager.has_all_glyphs(
|
|
'NotoSansDevanagari-Regular', sample
|
|
), f"NotoSansDevanagari should cover: {sample}"
|
|
|
|
def test_noto_sans_cjk_coverage(self, multi_font_manager):
|
|
"""Test NotoSansCJK covers CJK characters."""
|
|
if not _cjk_font_works(multi_font_manager):
|
|
pytest.skip("CJK font not available or corrupted")
|
|
|
|
cjk_samples = [
|
|
"你好", # Chinese: Hello
|
|
"世界", # Chinese: World
|
|
"こんにちは", # Japanese: Hello
|
|
"안녕하세요", # Korean: Hello
|
|
]
|
|
|
|
for sample in cjk_samples:
|
|
assert multi_font_manager.has_all_glyphs('NotoSansCJK-Regular', sample), \
|
|
f"NotoSansCJK should cover: {sample}"
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# Allow running this test directly for quick iteration
|
|
import sys
|
|
|
|
sys.exit(pytest.main([__file__, "-v", "-s"]))
|