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https://github.com/Frooodle/Stirling-PDF.git
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feat: add TextFinderUtils and WidthCalculator for text processing and font validation, TextEncodingHelper for encoding support
This commit is contained in:
Balázs Szücs
parent
7a9f962172
commit
6315721e8f
@ -32,9 +32,6 @@ import org.apache.pdfbox.pdmodel.PDResources;
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import org.apache.pdfbox.pdmodel.common.PDRectangle;
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import org.apache.pdfbox.pdmodel.common.PDStream;
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import org.apache.pdfbox.pdmodel.font.PDFont;
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import org.apache.pdfbox.pdmodel.font.PDSimpleFont;
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import org.apache.pdfbox.pdmodel.font.encoding.DictionaryEncoding;
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import org.apache.pdfbox.pdmodel.font.encoding.Encoding;
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import org.apache.pdfbox.pdmodel.graphics.PDXObject;
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import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
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import org.springframework.http.ResponseEntity;
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@ -59,6 +56,9 @@ import stirling.software.SPDF.model.PDFText;
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import stirling.software.SPDF.model.api.security.ManualRedactPdfRequest;
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import stirling.software.SPDF.model.api.security.RedactPdfRequest;
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import stirling.software.SPDF.pdf.TextFinder;
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import stirling.software.SPDF.utils.text.TextEncodingHelper;
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import stirling.software.SPDF.utils.text.TextFinderUtils;
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import stirling.software.SPDF.utils.text.WidthCalculator;
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import stirling.software.common.model.api.security.RedactionArea;
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import stirling.software.common.service.CustomPDFDocumentFactory;
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import stirling.software.common.util.GeneralUtils;
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@ -77,6 +77,9 @@ public class RedactController {
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private static final float PRECISION_THRESHOLD = 1e-3f;
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private static final int FONT_SCALE_FACTOR = 1000;
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// Redaction box width reduction factor (10% reduction)
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private static final float REDACTION_WIDTH_REDUCTION_FACTOR = 0.9f;
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// Text showing operators
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private static final Set<String> TEXT_SHOWING_OPERATORS = Set.of("Tj", "TJ", "'", "\"");
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@ -229,7 +232,11 @@ public class RedactController {
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}
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private void redactFoundText(
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PDDocument document, List<PDFText> blocks, float customPadding, Color redactColor)
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PDDocument document,
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List<PDFText> blocks,
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float customPadding,
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Color redactColor,
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boolean isTextRemovalMode)
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throws IOException {
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var allPages = document.getDocumentCatalog().getPages();
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@ -263,10 +270,28 @@ public class RedactController {
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(block.getY2() - block.getY1()) * DEFAULT_TEXT_PADDING_MULTIPLIER
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+ customPadding;
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float originalWidth = block.getX2() - block.getX1();
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float boxWidth;
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float boxX;
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// Only apply width reduction when text is actually being removed
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if (isTextRemovalMode) {
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// Calculate reduced width and center the box
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boxWidth =
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originalWidth
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* REDACTION_WIDTH_REDUCTION_FACTOR; // 10% reduction
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float widthReduction = originalWidth - boxWidth;
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boxX = block.getX1() + (widthReduction / 2); // Center the reduced box
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} else {
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// Use original width for box-only redaction
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boxWidth = originalWidth;
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boxX = block.getX1();
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}
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contentStream.addRect(
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block.getX1(),
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boxX,
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pageBox.getHeight() - block.getY2() - padding,
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block.getX2() - block.getX1(),
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boxWidth,
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block.getY2() - block.getY1() + 2 * padding);
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}
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@ -284,7 +309,7 @@ public class RedactController {
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return originalWord;
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}
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if (font != null && isFontSubset(font.getName())) {
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if (font != null && TextEncodingHelper.isFontSubset(font.getName())) {
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try {
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float originalWidth = safeGetStringWidth(font, originalWord) / FONT_SCALE_FACTOR;
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return createAlternativePlaceholder(originalWord, originalWidth, font, 1.0f);
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@ -300,6 +325,10 @@ public class RedactController {
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return " ".repeat(originalWord.length());
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}
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/**
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* Enhanced placeholder creation using advanced width calculation. Incorporates font validation
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* and sophisticated fallback strategies.
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*/
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String createPlaceholderWithWidth(
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String originalWord, float targetWidth, PDFont font, float fontSize) {
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if (originalWord == null || originalWord.isEmpty()) {
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@ -311,11 +340,21 @@ public class RedactController {
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}
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try {
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if (isFontSubset(font.getName())) {
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// Check font reliability before proceeding
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if (!WidthCalculator.isWidthCalculationReliable(font)) {
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log.debug(
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"Font {} unreliable for width calculation, using simple placeholder",
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font.getName());
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return " ".repeat(originalWord.length());
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}
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// Use enhanced subset font detection
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if (TextEncodingHelper.isFontSubset(font.getName())) {
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return createSubsetFontPlaceholder(originalWord, targetWidth, font, fontSize);
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}
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float spaceWidth = safeGetStringWidth(font, " ") / FONT_SCALE_FACTOR * fontSize;
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// Enhanced space width calculation
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float spaceWidth = WidthCalculator.calculateAccurateWidth(font, " ", fontSize);
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if (spaceWidth <= 0) {
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return createAlternativePlaceholder(originalWord, targetWidth, font, fontSize);
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@ -323,13 +362,16 @@ public class RedactController {
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int spaceCount = Math.max(1, Math.round(targetWidth / spaceWidth));
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int maxSpaces = originalWord.length() * 2;
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// More conservative space limit based on original word characteristics
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int maxSpaces =
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Math.max(
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originalWord.length() * 2, Math.round(targetWidth / spaceWidth * 1.5f));
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spaceCount = Math.min(spaceCount, maxSpaces);
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return " ".repeat(spaceCount);
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} catch (Exception e) {
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log.debug("Width-based placeholder creation failed: {}", e.getMessage());
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log.debug("Enhanced placeholder creation failed: {}", e.getMessage());
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return createAlternativePlaceholder(originalWord, targetWidth, font, fontSize);
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}
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}
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@ -359,7 +401,7 @@ public class RedactController {
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try {
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String[] alternatives = {" ", ".", "-", "_", "~", "°", "·"};
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if (fontSupportsCharacter(font, " ")) {
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if (TextEncodingHelper.fontSupportsCharacter(font, " ")) {
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float spaceWidth = safeGetStringWidth(font, " ") / FONT_SCALE_FACTOR * fontSize;
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if (spaceWidth > 0) {
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int spaceCount = Math.max(1, Math.round(targetWidth / spaceWidth));
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@ -371,10 +413,10 @@ public class RedactController {
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}
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for (String altChar : alternatives) {
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if (altChar.equals(" ")) continue; // Already tried spaces
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if (" ".equals(altChar)) continue; // Already tried spaces
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try {
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if (!fontSupportsCharacter(font, altChar)) {
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if (!TextEncodingHelper.fontSupportsCharacter(font, altChar)) {
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continue;
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}
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@ -546,7 +588,8 @@ public class RedactController {
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allFoundTextsByPage,
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request.getRedactColor(),
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request.getCustomPadding(),
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request.getConvertPDFToImage());
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request.getConvertPDFToImage(),
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false); // Box-only mode, use original box sizes
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return WebResponseUtils.bytesToWebResponse(
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pdfContent,
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@ -564,7 +607,8 @@ public class RedactController {
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allFoundTextsByPage,
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request.getRedactColor(),
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request.getCustomPadding(),
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request.getConvertPDFToImage());
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request.getConvertPDFToImage(),
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true); // Text removal mode, use reduced box sizes
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return WebResponseUtils.bytesToWebResponse(
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pdfContent,
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@ -608,14 +652,31 @@ public class RedactController {
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text = text.trim();
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if (text.isEmpty()) continue;
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log.debug(
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"Searching for text: '{}' (regex: {}, wholeWord: {})",
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text,
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useRegex,
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wholeWordSearch);
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try {
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TextFinder textFinder = new TextFinder(text, useRegex, wholeWordSearch);
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textFinder.getText(document);
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for (PDFText found : textFinder.getFoundTexts()) {
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List<PDFText> foundTexts = textFinder.getFoundTexts();
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log.debug("TextFinder found {} instances of '{}'", foundTexts.size(), text);
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for (PDFText found : foundTexts) {
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allFoundTextsByPage
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.computeIfAbsent(found.getPageIndex(), k -> new ArrayList<>())
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.add(found);
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log.debug(
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"Added match on page {} at ({},{},{},{}): '{}'",
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found.getPageIndex(),
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found.getX1(),
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found.getY1(),
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found.getX2(),
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found.getY2(),
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found.getText());
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}
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} catch (Exception e) {
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log.error("Error processing search term '{}': {}", text, e.getMessage());
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@ -673,7 +734,8 @@ public class RedactController {
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Map<Integer, List<PDFText>> allFoundTextsByPage,
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String colorString,
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float customPadding,
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Boolean convertToImage)
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Boolean convertToImage,
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boolean isTextRemovalMode)
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throws IOException {
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List<PDFText> allFoundTexts = new ArrayList<>();
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@ -684,7 +746,7 @@ public class RedactController {
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if (!allFoundTexts.isEmpty()) {
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Color redactColor = decodeOrDefault(colorString);
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redactFoundText(document, allFoundTexts, customPadding, redactColor);
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redactFoundText(document, allFoundTexts, customPadding, redactColor, isTextRemovalMode);
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cleanDocumentMetadata(document);
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}
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@ -870,16 +932,24 @@ public class RedactController {
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boolean useRegex,
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boolean wholeWordSearch) {
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return targetWords.stream()
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.map(
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target -> {
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String patternString = useRegex ? target : Pattern.quote(target);
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if (wholeWordSearch) {
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patternString = "\\b" + patternString + "\\b";
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// Use the new utility for creating optimized patterns
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List<Pattern> patterns =
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TextFinderUtils.createOptimizedSearchPatterns(
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targetWords, useRegex, wholeWordSearch);
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return patterns.stream()
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.flatMap(
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pattern -> {
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try {
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return pattern.matcher(completeText).results();
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} catch (Exception e) {
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log.debug(
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"Pattern matching failed for pattern {}: {}",
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pattern.pattern(),
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e.getMessage());
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return java.util.stream.Stream.empty();
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}
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return Pattern.compile(patternString, Pattern.CASE_INSENSITIVE);
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})
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.flatMap(pattern -> pattern.matcher(completeText).results())
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.map(matchResult -> new MatchRange(matchResult.start(), matchResult.end()))
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.sorted(Comparator.comparingInt(MatchRange::getStartPos))
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.collect(Collectors.toList());
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@ -957,6 +1027,16 @@ public class RedactController {
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private String applyRedactionsToSegmentText(TextSegment segment, List<MatchRange> matches) {
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String text = segment.getText();
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if (segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(segment.getFont(), text)) {
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log.debug(
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"Skipping text segment '{}' - font {} cannot process this text reliably",
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text,
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segment.getFont().getName());
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return text; // Return original text unchanged
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}
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StringBuilder result = new StringBuilder(text);
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for (MatchRange match : matches) {
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@ -966,6 +1046,15 @@ public class RedactController {
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if (segmentStart < text.length() && segmentEnd > segmentStart) {
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String originalPart = text.substring(segmentStart, segmentEnd);
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if (segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(
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segment.getFont(), originalPart)) {
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log.debug(
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"Skipping text part '{}' within segment - cannot be processed reliably",
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originalPart);
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continue; // Skip this match, process others
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}
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float originalWidth = 0;
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if (segment.getFont() != null && segment.getFontSize() > 0) {
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try {
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@ -1001,68 +1090,125 @@ public class RedactController {
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return 0;
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}
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if (!WidthCalculator.isWidthCalculationReliable(font)) {
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log.debug(
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"Font {} flagged as unreliable for width calculation, using fallback",
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font.getName());
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return calculateConservativeWidth(font, text);
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}
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if (!TextEncodingHelper.canEncodeCharacters(font, text)) {
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log.debug(
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"Text cannot be encoded by font {}, using character-based fallback",
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font.getName());
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return calculateCharacterBasedWidth(font, text);
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}
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try {
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return font.getStringWidth(text);
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float width = font.getStringWidth(text);
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log.debug("Direct width calculation successful for '{}': {}", text, width);
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return width;
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} catch (Exception e) {
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try {
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float totalWidth = 0;
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for (int i = 0; i < text.length(); i++) {
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String character = text.substring(i, i + 1);
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try {
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byte[] encoded = font.encode(character);
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if (encoded.length > 0) {
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int glyphCode = encoded[0] & 0xFF;
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log.debug(
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"Direct width calculation failed for font {}: {}",
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font.getName(),
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e.getMessage());
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return calculateFallbackWidth(font, text);
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}
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}
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float glyphWidth = font.getWidth(glyphCode);
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private float calculateCharacterBasedWidth(PDFont font, String text) {
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try {
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float totalWidth = 0;
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for (int i = 0; i < text.length(); i++) {
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String character = text.substring(i, i + 1);
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try {
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// Validate character encoding first
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if (!TextEncodingHelper.fontSupportsCharacter(font, character)) {
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totalWidth += font.getAverageFontWidth();
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continue;
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}
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if (glyphWidth == 0) {
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try {
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glyphWidth = font.getWidthFromFont(glyphCode);
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} catch (Exception e2) {
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glyphWidth = font.getAverageFontWidth();
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}
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byte[] encoded = font.encode(character);
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if (encoded.length > 0) {
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int glyphCode = encoded[0] & 0xFF;
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float glyphWidth = font.getWidth(glyphCode);
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// Try alternative width methods if primary fails
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if (glyphWidth == 0) {
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try {
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glyphWidth = font.getWidthFromFont(glyphCode);
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} catch (Exception e2) {
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glyphWidth = font.getAverageFontWidth();
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}
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totalWidth += glyphWidth;
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} else {
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totalWidth += font.getAverageFontWidth();
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}
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} catch (Exception e2) {
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totalWidth += glyphWidth;
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} else {
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totalWidth += font.getAverageFontWidth();
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}
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} catch (Exception e2) {
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// Character processing failed, use average width
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totalWidth += font.getAverageFontWidth();
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}
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return totalWidth;
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} catch (Exception e2) {
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log.debug("PDFBox API width calculation failed: {}", e2.getMessage());
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}
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try {
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if (font.getFontDescriptor() != null
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&& font.getFontDescriptor().getFontBoundingBox() != null) {
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PDRectangle bbox = font.getFontDescriptor().getFontBoundingBox();
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float avgCharWidth = bbox.getHeight() / 1000f * 0.865f;
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return text.length() * avgCharWidth * FONT_SCALE_FACTOR;
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}
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} catch (Exception e2) {
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log.debug("Font bounding box width calculation failed: {}", e2.getMessage());
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log.debug("Character-based width calculation: {}", totalWidth);
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return totalWidth;
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} catch (Exception e) {
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log.debug("Character-based width calculation failed: {}", e.getMessage());
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return calculateConservativeWidth(font, text);
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}
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}
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private float calculateFallbackWidth(PDFont font, String text) {
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try {
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// Method 1: Font bounding box approach
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if (font.getFontDescriptor() != null
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&& font.getFontDescriptor().getFontBoundingBox() != null) {
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PDRectangle bbox = font.getFontDescriptor().getFontBoundingBox();
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float avgCharWidth = bbox.getWidth() * 0.6f; // Conservative estimate
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float fallbackWidth = text.length() * avgCharWidth;
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log.debug("Bounding box fallback width: {}", fallbackWidth);
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return fallbackWidth;
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}
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// Method 2: Average font width
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try {
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float avgWidth = font.getAverageFontWidth();
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return text.length() * avgWidth;
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if (avgWidth > 0) {
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float fallbackWidth = text.length() * avgWidth;
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log.debug("Average width fallback: {}", fallbackWidth);
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return fallbackWidth;
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}
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} catch (Exception e2) {
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log.debug("Average font width calculation failed: {}", e2.getMessage());
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}
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float conservativeWidth = text.length() * 500f; // 500 units per character
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log.debug(
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"All width calculation methods failed for font {}, using conservative estimate: {}",
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font.getName(),
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conservativeWidth);
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return conservativeWidth;
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// Method 3: Conservative estimate based on font metrics
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return calculateConservativeWidth(font, text);
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} catch (Exception e) {
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log.debug("Fallback width calculation failed: {}", e.getMessage());
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return calculateConservativeWidth(font, text);
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}
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}
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private float calculateConservativeWidth(PDFont font, String text) {
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float conservativeWidth = text.length() * 500f;
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log.debug(
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"Conservative width estimate for font {} text '{}': {}",
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font.getName(),
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text,
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conservativeWidth);
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return conservativeWidth;
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}
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private float calculateWidthAdjustment(TextSegment segment, List<MatchRange> matches) {
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try {
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if (segment.getFont() == null || segment.getFontSize() <= 0) {
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@ -1070,7 +1216,8 @@ public class RedactController {
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}
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String fontName = segment.getFont().getName();
|
||||
if (fontName != null && (fontName.contains("HOEPAP") || isFontSubset(fontName))) {
|
||||
if (fontName != null
|
||||
&& (fontName.contains("HOEPAP") || TextEncodingHelper.isFontSubset(fontName))) {
|
||||
log.debug("Skipping width adjustment for problematic/subset font: {}", fontName);
|
||||
return 0;
|
||||
}
|
||||
@ -1196,6 +1343,19 @@ public class RedactController {
|
||||
for (COSBase element : originalArray) {
|
||||
if (element instanceof COSString cosString) {
|
||||
String originalText = cosString.getString();
|
||||
|
||||
if (segment.getFont() != null
|
||||
&& !TextEncodingHelper.isTextSegmentRemovable(
|
||||
segment.getFont(), originalText)) {
|
||||
log.debug(
|
||||
"Skipping TJ text part '{}' - cannot be processed reliably with font {}",
|
||||
originalText,
|
||||
segment.getFont().getName());
|
||||
newArray.add(element); // Keep original unchanged
|
||||
textOffsetInSegment += originalText.length();
|
||||
continue;
|
||||
}
|
||||
|
||||
StringBuilder newText = new StringBuilder(originalText);
|
||||
boolean modified = false;
|
||||
|
||||
@ -1207,7 +1367,6 @@ public class RedactController {
|
||||
int overlapEnd = Math.min(match.getEndPos(), stringEndInPage);
|
||||
|
||||
if (overlapStart < overlapEnd) {
|
||||
modified = true;
|
||||
int redactionStartInString = overlapStart - stringStartInPage;
|
||||
int redactionEndInString = overlapEnd - stringStartInPage;
|
||||
if (redactionStartInString >= 0
|
||||
@ -1216,6 +1375,16 @@ public class RedactController {
|
||||
originalText.substring(
|
||||
redactionStartInString, redactionEndInString);
|
||||
|
||||
if (segment.getFont() != null
|
||||
&& !TextEncodingHelper.isTextSegmentRemovable(
|
||||
segment.getFont(), originalPart)) {
|
||||
log.debug(
|
||||
"Skipping TJ text part '{}' - cannot be redacted reliably",
|
||||
originalPart);
|
||||
continue; // Skip this redaction, keep original text
|
||||
}
|
||||
|
||||
modified = true;
|
||||
float originalWidth = 0;
|
||||
if (segment.getFont() != null && segment.getFontSize() > 0) {
|
||||
try {
|
||||
@ -1320,8 +1489,13 @@ public class RedactController {
|
||||
int totalFonts = 0;
|
||||
int customEncodedFonts = 0;
|
||||
int subsetFonts = 0;
|
||||
int unreliableFonts = 0;
|
||||
|
||||
for (PDPage page : document.getPages()) {
|
||||
if (TextFinderUtils.hasProblematicFonts(page)) {
|
||||
log.debug("Page contains fonts flagged as problematic by TextFinderUtils");
|
||||
}
|
||||
|
||||
PDResources resources = page.getResources();
|
||||
if (resources == null) {
|
||||
continue;
|
||||
@ -1333,190 +1507,64 @@ public class RedactController {
|
||||
if (font != null) {
|
||||
totalFonts++;
|
||||
|
||||
boolean isSubset = isFontSubset(font.getName());
|
||||
boolean isProblematic = hasProblematicFontCharacteristics(font);
|
||||
// Enhanced analysis using helper classes
|
||||
boolean isSubset = TextEncodingHelper.isFontSubset(font.getName());
|
||||
boolean hasCustomEncoding = TextEncodingHelper.hasCustomEncoding(font);
|
||||
boolean isReliable = WidthCalculator.isWidthCalculationReliable(font);
|
||||
boolean canCalculateWidths =
|
||||
TextEncodingHelper.canCalculateBasicWidths(font);
|
||||
|
||||
if (isSubset) {
|
||||
subsetFonts++;
|
||||
}
|
||||
|
||||
if (isProblematic) {
|
||||
if (hasCustomEncoding) {
|
||||
customEncodedFonts++;
|
||||
log.debug("Font {} has custom encoding", font.getName());
|
||||
}
|
||||
|
||||
if (!isReliable || !canCalculateWidths) {
|
||||
unreliableFonts++;
|
||||
log.debug(
|
||||
"Detected problematic font: {} (type: {})",
|
||||
"Font {} flagged as unreliable: reliable={}, canCalculateWidths={}",
|
||||
font.getName(),
|
||||
font.getClass().getSimpleName());
|
||||
isReliable,
|
||||
canCalculateWidths);
|
||||
}
|
||||
|
||||
if (!TextFinderUtils.validateFontReliability(font)) {
|
||||
log.debug(
|
||||
"Font {} failed comprehensive reliability check",
|
||||
font.getName());
|
||||
}
|
||||
}
|
||||
} catch (IOException e) {
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Font loading failed for {}: {}",
|
||||
"Font loading/analysis failed for {}: {}",
|
||||
fontName.getName(),
|
||||
e.getMessage());
|
||||
customEncodedFonts++;
|
||||
unreliableFonts++;
|
||||
totalFonts++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
log.info(
|
||||
"Font analysis: {}/{} fonts use custom encoding, {}/{} are subset fonts (subset fonts with standard encodings are fine)",
|
||||
"Enhanced font analysis: {}/{} custom encoding, {}/{} subset, {}/{} unreliable fonts",
|
||||
customEncodedFonts,
|
||||
totalFonts,
|
||||
subsetFonts,
|
||||
totalFonts,
|
||||
unreliableFonts,
|
||||
totalFonts);
|
||||
|
||||
return customEncodedFonts > 0;
|
||||
} catch (Exception e) {
|
||||
log.warn("Font detection analysis failed: {}", e.getMessage());
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
private boolean hasProblematicFontCharacteristics(PDFont font) {
|
||||
try {
|
||||
if (font.isDamaged()) {
|
||||
log.debug("Font {} is marked as damaged by PDFBox", font.getName());
|
||||
return true;
|
||||
}
|
||||
|
||||
if (hasCustomEncoding(font)) {
|
||||
log.debug(
|
||||
"Font {} uses custom encoding - text replacement will be unreliable",
|
||||
font.getName());
|
||||
return true;
|
||||
}
|
||||
|
||||
String fontType = font.getClass().getSimpleName();
|
||||
if ("PDType3Font".equals(fontType)) {
|
||||
log.debug("Font {} is Type3 - may have text replacement issues", font.getName());
|
||||
return cannotCalculateBasicWidths(font);
|
||||
}
|
||||
|
||||
log.debug("Font {} appears suitable for text replacement", font.getName());
|
||||
return false;
|
||||
// Consider document problematic if we have custom encodings or unreliable fonts
|
||||
return customEncodedFonts > 0 || unreliableFonts > 0;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.debug("Font analysis failed for {}: {}", font.getName(), e.getMessage());
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
private boolean hasCustomEncoding(PDFont font) {
|
||||
try {
|
||||
if (font instanceof PDSimpleFont simpleFont) {
|
||||
try {
|
||||
Encoding encoding = simpleFont.getEncoding();
|
||||
if (encoding != null) {
|
||||
String encodingName = encoding.getEncodingName();
|
||||
|
||||
// Check if it's one of the standard encodings
|
||||
if ("WinAnsiEncoding".equals(encodingName)
|
||||
|| "MacRomanEncoding".equals(encodingName)
|
||||
|| "StandardEncoding".equals(encodingName)
|
||||
|| "MacExpertEncoding".equals(encodingName)
|
||||
|| "SymbolEncoding".equals(encodingName)
|
||||
|| "ZapfDingbatsEncoding".equals(encodingName)) {
|
||||
|
||||
log.debug(
|
||||
"Font {} uses standard encoding: {}",
|
||||
font.getName(),
|
||||
encodingName);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (encoding instanceof DictionaryEncoding) {
|
||||
log.debug(
|
||||
"Font {} uses DictionaryEncoding - likely custom",
|
||||
font.getName());
|
||||
return true;
|
||||
}
|
||||
|
||||
log.debug(
|
||||
"Font {} uses non-standard encoding: {}",
|
||||
font.getName(),
|
||||
encodingName);
|
||||
return true;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Could not determine encoding for font {}: {}",
|
||||
font.getName(),
|
||||
e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
if (font instanceof org.apache.pdfbox.pdmodel.font.PDType0Font) {
|
||||
log.debug("Font {} is Type0 (CID) - generally uses standard CMaps", font.getName());
|
||||
return false; // Be forgiving with CID fonts
|
||||
}
|
||||
|
||||
log.debug(
|
||||
"Font {} type {} - assuming standard encoding",
|
||||
font.getName(),
|
||||
font.getClass().getSimpleName());
|
||||
return false;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Custom encoding detection failed for font {}: {}",
|
||||
font.getName(),
|
||||
e.getMessage());
|
||||
return false; // Be forgiving on detection failure
|
||||
}
|
||||
}
|
||||
|
||||
private boolean cannotCalculateBasicWidths(PDFont font) {
|
||||
try {
|
||||
float spaceWidth = font.getStringWidth(" ");
|
||||
if (spaceWidth <= 0) {
|
||||
return true;
|
||||
}
|
||||
|
||||
String[] testChars = {"a", "A", "0", ".", "e", "!"};
|
||||
for (String ch : testChars) {
|
||||
try {
|
||||
float width = font.getStringWidth(ch);
|
||||
if (width > 0) {
|
||||
return false; // Found at least one character we can measure
|
||||
}
|
||||
} catch (Exception e) {
|
||||
}
|
||||
}
|
||||
|
||||
return true; // Can't calculate width for any test characters
|
||||
} catch (Exception e) {
|
||||
return true; // Font failed basic width calculation
|
||||
}
|
||||
}
|
||||
|
||||
private boolean isFontSubset(String fontName) {
|
||||
if (fontName == null) {
|
||||
return false;
|
||||
}
|
||||
return fontName.matches("^[A-Z]{6}\\+.*");
|
||||
}
|
||||
|
||||
private boolean fontSupportsCharacter(PDFont font, String character) {
|
||||
if (font == null || character == null || character.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
try {
|
||||
byte[] encoded = font.encode(character);
|
||||
if (encoded.length == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
float width = font.getStringWidth(character);
|
||||
return width > 0;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Character '{}' not supported by font {}: {}",
|
||||
character,
|
||||
font.getName(),
|
||||
e.getMessage());
|
||||
return false;
|
||||
log.warn("Enhanced font detection analysis failed: {}", e.getMessage());
|
||||
return true; // Assume problematic if analysis fails
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -10,8 +10,11 @@ import org.apache.pdfbox.pdmodel.PDPage;
|
||||
import org.apache.pdfbox.text.PDFTextStripper;
|
||||
import org.apache.pdfbox.text.TextPosition;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
import stirling.software.SPDF.model.PDFText;
|
||||
|
||||
@Slf4j
|
||||
public class TextFinder extends PDFTextStripper {
|
||||
|
||||
private final String searchTerm;
|
||||
@ -67,16 +70,40 @@ public class TextFinder extends PDFTextStripper {
|
||||
String processedSearchTerm = this.searchTerm.trim();
|
||||
String regex = this.useRegex ? processedSearchTerm : "\\Q" + processedSearchTerm + "\\E";
|
||||
if (this.wholeWordSearch) {
|
||||
regex = "\\b" + regex + "\\b";
|
||||
if (processedSearchTerm.length() == 1
|
||||
&& Character.isDigit(processedSearchTerm.charAt(0))) {
|
||||
regex = "(?<![\\w])" + regex + "(?![\\w])";
|
||||
} else if (processedSearchTerm.length() == 1) {
|
||||
regex = "(?<![\\w])" + regex + "(?![\\w])";
|
||||
} else {
|
||||
regex = "\\b" + regex + "\\b";
|
||||
}
|
||||
}
|
||||
|
||||
Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
|
||||
Matcher matcher = pattern.matcher(text);
|
||||
|
||||
log.debug(
|
||||
"Searching for '{}' in page {} with regex '{}' (wholeWord: {}, useRegex: {})",
|
||||
processedSearchTerm,
|
||||
getCurrentPageNo(),
|
||||
regex,
|
||||
wholeWordSearch,
|
||||
useRegex);
|
||||
|
||||
int matchCount = 0;
|
||||
while (matcher.find()) {
|
||||
matchCount++;
|
||||
int matchStart = matcher.start();
|
||||
int matchEnd = matcher.end();
|
||||
|
||||
log.debug(
|
||||
"Found match #{} at positions {}-{}: '{}'",
|
||||
matchCount,
|
||||
matchStart,
|
||||
matchEnd,
|
||||
matcher.group());
|
||||
|
||||
float minX = Float.MAX_VALUE;
|
||||
float minY = Float.MAX_VALUE;
|
||||
float maxX = Float.MIN_VALUE;
|
||||
@ -85,6 +112,10 @@ public class TextFinder extends PDFTextStripper {
|
||||
|
||||
for (int i = matchStart; i < matchEnd; i++) {
|
||||
if (i >= pageTextPositions.size()) {
|
||||
log.debug(
|
||||
"Position index {} exceeds available positions ({})",
|
||||
i,
|
||||
pageTextPositions.size());
|
||||
continue;
|
||||
}
|
||||
TextPosition pos = pageTextPositions.get(i);
|
||||
@ -97,6 +128,27 @@ public class TextFinder extends PDFTextStripper {
|
||||
}
|
||||
}
|
||||
|
||||
if (!foundPosition && matchStart < pageTextPositions.size()) {
|
||||
log.debug(
|
||||
"Attempting to find nearby positions for match at {}-{}",
|
||||
matchStart,
|
||||
matchEnd);
|
||||
|
||||
for (int i = Math.max(0, matchStart - 5);
|
||||
i < Math.min(pageTextPositions.size(), matchEnd + 5);
|
||||
i++) {
|
||||
TextPosition pos = pageTextPositions.get(i);
|
||||
if (pos != null) {
|
||||
foundPosition = true;
|
||||
minX = Math.min(minX, pos.getX());
|
||||
maxX = Math.max(maxX, pos.getX() + pos.getWidth());
|
||||
minY = Math.min(minY, pos.getY() - pos.getHeight());
|
||||
maxY = Math.max(maxY, pos.getY());
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (foundPosition) {
|
||||
foundTexts.add(
|
||||
new PDFText(
|
||||
@ -106,13 +158,59 @@ public class TextFinder extends PDFTextStripper {
|
||||
maxX,
|
||||
maxY,
|
||||
matcher.group()));
|
||||
log.debug(
|
||||
"Added PDFText for match: page={}, bounds=({},{},{},{}), text='{}'",
|
||||
getCurrentPageNo() - 1,
|
||||
minX,
|
||||
minY,
|
||||
maxX,
|
||||
maxY,
|
||||
matcher.group());
|
||||
} else {
|
||||
log.warn(
|
||||
"Found text match '{}' but no valid position data at {}-{}",
|
||||
matcher.group(),
|
||||
matchStart,
|
||||
matchEnd);
|
||||
}
|
||||
}
|
||||
|
||||
log.debug(
|
||||
"Page {} search complete: found {} matches for '{}'",
|
||||
getCurrentPageNo(),
|
||||
matchCount,
|
||||
processedSearchTerm);
|
||||
|
||||
super.endPage(page);
|
||||
}
|
||||
|
||||
public List<PDFText> getFoundTexts() {
|
||||
return foundTexts;
|
||||
}
|
||||
|
||||
public String getDebugInfo() {
|
||||
StringBuilder debug = new StringBuilder();
|
||||
debug.append("Extracted text length: ").append(pageTextBuilder.length()).append("\n");
|
||||
debug.append("Position count: ").append(pageTextPositions.size()).append("\n");
|
||||
debug.append("Text content: '")
|
||||
.append(pageTextBuilder.toString().replace("\n", "\\n").replace("\r", "\\r"))
|
||||
.append("'\n");
|
||||
|
||||
String text = pageTextBuilder.toString();
|
||||
for (int i = 0; i < Math.min(text.length(), 50); i++) {
|
||||
char c = text.charAt(i);
|
||||
TextPosition pos = i < pageTextPositions.size() ? pageTextPositions.get(i) : null;
|
||||
debug.append(
|
||||
String.format(
|
||||
" [%d] '%c' (0x%02X) -> %s\n",
|
||||
i,
|
||||
c,
|
||||
(int) c,
|
||||
pos != null
|
||||
? String.format("(%.1f,%.1f)", pos.getX(), pos.getY())
|
||||
: "null"));
|
||||
}
|
||||
|
||||
return debug.toString();
|
||||
}
|
||||
}
|
||||
|
||||
@ -0,0 +1,351 @@
|
||||
package stirling.software.SPDF.utils.text;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.pdfbox.pdmodel.font.PDFont;
|
||||
import org.apache.pdfbox.pdmodel.font.PDSimpleFont;
|
||||
import org.apache.pdfbox.pdmodel.font.encoding.DictionaryEncoding;
|
||||
import org.apache.pdfbox.pdmodel.font.encoding.Encoding;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
@Slf4j
|
||||
public class TextEncodingHelper {
|
||||
|
||||
public static boolean canEncodeCharacters(PDFont font, String text) {
|
||||
if (font == null || text == null || text.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
try {
|
||||
// Step 1: Primary check - full-string encoding (permissive for "good" cases)
|
||||
byte[] encoded = font.encode(text);
|
||||
if (encoded.length > 0) {
|
||||
log.debug(
|
||||
"Text '{}' has good full-string encoding for font {} - permissively allowing",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return true;
|
||||
}
|
||||
|
||||
// Step 2: Smart array-based fallback for TJ operator-style text
|
||||
log.debug(
|
||||
"Full encoding failed for '{}' - using array-based fallback for font {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
|
||||
return validateAsCodePointArray(font, text);
|
||||
|
||||
} catch (IOException | IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Encoding exception for text '{}' with font {} - trying array fallback: {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
|
||||
if (isFontSubset(font.getName()) || hasCustomEncoding(font)) {
|
||||
return validateAsCodePointArray(font, text);
|
||||
}
|
||||
|
||||
return false; // Non-subset fonts with encoding exceptions are likely problematic
|
||||
}
|
||||
}
|
||||
|
||||
private static boolean validateAsCodePointArray(PDFont font, String text) {
|
||||
int totalCodePoints = 0;
|
||||
int successfulCodePoints = 0;
|
||||
|
||||
// Iterate through code points (handles surrogates correctly per Unicode docs)
|
||||
for (int i = 0; i < text.length(); ) {
|
||||
int codePoint = text.codePointAt(i);
|
||||
String charStr = new String(Character.toChars(codePoint));
|
||||
totalCodePoints++;
|
||||
|
||||
try {
|
||||
// Test encoding for this code point
|
||||
byte[] charEncoded = font.encode(charStr);
|
||||
if (charEncoded.length > 0) {
|
||||
float charWidth = font.getStringWidth(charStr);
|
||||
|
||||
if (charWidth >= 0) {
|
||||
successfulCodePoints++;
|
||||
log.debug(
|
||||
"Code point '{}' (U+{}) encoded successfully",
|
||||
charStr,
|
||||
Integer.toHexString(codePoint).toUpperCase());
|
||||
} else {
|
||||
log.debug(
|
||||
"Code point '{}' (U+{}) has invalid width: {}",
|
||||
charStr,
|
||||
Integer.toHexString(codePoint).toUpperCase(),
|
||||
charWidth);
|
||||
}
|
||||
} else {
|
||||
log.debug(
|
||||
"Code point '{}' (U+{}) encoding failed - empty result",
|
||||
charStr,
|
||||
Integer.toHexString(codePoint).toUpperCase());
|
||||
}
|
||||
} catch (IOException | IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Code point '{}' (U+{}) validation failed: {}",
|
||||
charStr,
|
||||
Integer.toHexString(codePoint).toUpperCase(),
|
||||
e.getMessage());
|
||||
}
|
||||
|
||||
i += Character.charCount(codePoint); // Handle surrogates properly
|
||||
}
|
||||
|
||||
double successRate =
|
||||
totalCodePoints > 0 ? (double) successfulCodePoints / totalCodePoints : 0;
|
||||
boolean isAcceptable = successRate >= 0.95;
|
||||
|
||||
log.debug(
|
||||
"Array validation for '{}': {}/{} code points successful ({:.1f}%) - {}",
|
||||
text,
|
||||
successfulCodePoints,
|
||||
totalCodePoints,
|
||||
successRate * 100,
|
||||
isAcceptable ? "ALLOWING" : "rejecting");
|
||||
|
||||
return isAcceptable;
|
||||
}
|
||||
|
||||
public static boolean isTextSegmentRemovable(PDFont font, String text) {
|
||||
if (font == null || text == null || text.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Log the attempt
|
||||
log.debug(
|
||||
"Evaluating text segment for removal: '{}' with font {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown Font");
|
||||
|
||||
if (isSimpleCharacter(text)) {
|
||||
try {
|
||||
font.encode(text);
|
||||
font.getStringWidth(text);
|
||||
log.debug(
|
||||
"Text '{}' is a simple character and passed validation - allowing removal",
|
||||
text);
|
||||
return true;
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Simple character '{}' failed basic validation with font {}: {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// For complex text, require comprehensive validation
|
||||
return isTextFullyRemovable(font, text);
|
||||
}
|
||||
|
||||
public static boolean isTextFullyRemovable(PDFont font, String text) {
|
||||
if (font == null || text == null || text.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
try {
|
||||
// Check 1: Verify encoding capability using new smart approach
|
||||
if (!canEncodeCharacters(font, text)) {
|
||||
log.debug(
|
||||
"Text '{}' failed encoding validation for font {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return false;
|
||||
}
|
||||
|
||||
// Check 2: Validate width calculation capability
|
||||
float width = font.getStringWidth(text);
|
||||
if (width < 0) { // Allow zero width (invisible chars) but reject negative (invalid)
|
||||
log.debug(
|
||||
"Text '{}' has invalid width {} for font {}",
|
||||
text,
|
||||
width,
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return false; // Invalid metrics prevent accurate removal
|
||||
}
|
||||
|
||||
// Check 3: Verify font descriptor completeness for redaction area calculation
|
||||
if (font.getFontDescriptor() == null) {
|
||||
log.debug(
|
||||
"Missing font descriptor for font {}",
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return false;
|
||||
}
|
||||
|
||||
// Check 4: Test bounding box calculation for redaction area
|
||||
try {
|
||||
font.getFontDescriptor().getFontBoundingBox();
|
||||
} catch (IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Font bounding box unavailable for font {}: {}",
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false;
|
||||
}
|
||||
|
||||
log.debug(
|
||||
"Text '{}' passed comprehensive validation for font {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return true;
|
||||
|
||||
} catch (IOException e) {
|
||||
log.debug(
|
||||
"Text '{}' failed validation for font {} due to IO error: {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false;
|
||||
} catch (IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Text '{}' failed validation for font {} due to argument error: {}",
|
||||
text,
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
private static boolean isSimpleCharacter(String text) {
|
||||
if (text == null || text.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (text.length() > 20) {
|
||||
return false;
|
||||
}
|
||||
|
||||
for (int i = 0; i < text.length(); i++) {
|
||||
char c = text.charAt(i);
|
||||
|
||||
// Allow letters, digits, and whitespace (most common cases)
|
||||
if (Character.isLetterOrDigit(c) || Character.isWhitespace(c)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Allow common ASCII punctuation
|
||||
if (c >= 32 && c <= 126 && ".,!?;:()-[]{}\"'/@#$%&*+=<>|\\~`".indexOf(c) >= 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
public static boolean hasCustomEncoding(PDFont font) {
|
||||
try {
|
||||
if (font instanceof PDSimpleFont simpleFont) {
|
||||
try {
|
||||
Encoding encoding = simpleFont.getEncoding();
|
||||
if (encoding != null) {
|
||||
// Check for dictionary-based custom encodings
|
||||
if (encoding instanceof DictionaryEncoding) {
|
||||
log.debug("Font {} uses DictionaryEncoding (custom)", font.getName());
|
||||
return true;
|
||||
}
|
||||
|
||||
String encodingName = encoding.getClass().getSimpleName();
|
||||
if (encodingName.contains("Custom")
|
||||
|| encodingName.contains("Dictionary")) {
|
||||
log.debug(
|
||||
"Font {} uses custom encoding: {}",
|
||||
font.getName(),
|
||||
encodingName);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Encoding detection failed for font {}: {}",
|
||||
font.getName(),
|
||||
e.getMessage());
|
||||
return true; // Assume custom if detection fails
|
||||
}
|
||||
}
|
||||
|
||||
if (font instanceof org.apache.pdfbox.pdmodel.font.PDType0Font) {
|
||||
log.debug(
|
||||
"Font {} is Type0 (CID) - generally uses standard CMaps",
|
||||
font.getName() != null ? font.getName() : "Unknown");
|
||||
return false;
|
||||
}
|
||||
|
||||
log.debug(
|
||||
"Font {} type {} - assuming standard encoding",
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
font.getClass().getSimpleName());
|
||||
return false;
|
||||
|
||||
} catch (IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Custom encoding detection failed for font {}: {}",
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false; // Be forgiving on detection failure
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean fontSupportsCharacter(PDFont font, String character) {
|
||||
if (font == null || character == null || character.isEmpty()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
try {
|
||||
byte[] encoded = font.encode(character);
|
||||
if (encoded.length == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
float width = font.getStringWidth(character);
|
||||
return width > 0;
|
||||
|
||||
} catch (IOException | IllegalArgumentException e) {
|
||||
log.debug(
|
||||
"Character '{}' not supported by font {}: {}",
|
||||
character,
|
||||
font.getName() != null ? font.getName() : "Unknown",
|
||||
e.getMessage());
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean isFontSubset(String fontName) {
|
||||
if (fontName == null) {
|
||||
return false;
|
||||
}
|
||||
return fontName.matches("^[A-Z]{6}\\+.*");
|
||||
}
|
||||
|
||||
public static boolean canCalculateBasicWidths(PDFont font) {
|
||||
try {
|
||||
float spaceWidth = font.getStringWidth(" ");
|
||||
if (spaceWidth <= 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
String[] testChars = {"a", "A", "0", ".", "e", "!"};
|
||||
for (String ch : testChars) {
|
||||
try {
|
||||
float width = font.getStringWidth(ch);
|
||||
if (width > 0) {
|
||||
return true;
|
||||
}
|
||||
} catch (IOException | IllegalArgumentException e) {
|
||||
}
|
||||
}
|
||||
|
||||
return false; // Can't calculate width for any test characters
|
||||
} catch (IOException | IllegalArgumentException e) {
|
||||
return false; // Font failed basic width calculation
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,140 @@
|
||||
package stirling.software.SPDF.utils.text;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
import java.util.Set;
|
||||
import java.util.regex.Pattern;
|
||||
|
||||
import org.apache.pdfbox.pdmodel.PDPage;
|
||||
import org.apache.pdfbox.pdmodel.PDResources;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
@Slf4j
|
||||
public class TextFinderUtils {
|
||||
|
||||
public static boolean validateFontReliability(org.apache.pdfbox.pdmodel.font.PDFont font) {
|
||||
if (font == null) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (font.isDamaged()) {
|
||||
log.debug(
|
||||
"Font {} is marked as damaged - using TextEncodingHelper validation",
|
||||
font.getName());
|
||||
}
|
||||
|
||||
if (TextEncodingHelper.canCalculateBasicWidths(font)) {
|
||||
log.debug(
|
||||
"Font {} passed basic width calculations - considering reliable",
|
||||
font.getName());
|
||||
return true;
|
||||
}
|
||||
|
||||
String[] basicTests = {"1", "2", "3", "a", "A", "e", "E", " "};
|
||||
|
||||
int workingChars = 0;
|
||||
for (String testChar : basicTests) {
|
||||
if (TextEncodingHelper.canEncodeCharacters(font, testChar)) {
|
||||
workingChars++;
|
||||
}
|
||||
}
|
||||
|
||||
if (workingChars > 0) {
|
||||
log.debug(
|
||||
"Font {} can process {}/{} basic characters - considering reliable",
|
||||
font.getName(),
|
||||
workingChars,
|
||||
basicTests.length);
|
||||
return true;
|
||||
}
|
||||
|
||||
log.debug("Font {} failed all basic tests - considering unreliable", font.getName());
|
||||
return false;
|
||||
}
|
||||
|
||||
public static List<Pattern> createOptimizedSearchPatterns(
|
||||
Set<String> searchTerms, boolean useRegex, boolean wholeWordSearch) {
|
||||
List<Pattern> patterns = new ArrayList<>();
|
||||
|
||||
for (String term : searchTerms) {
|
||||
if (term == null || term.trim().isEmpty()) {
|
||||
continue;
|
||||
}
|
||||
|
||||
try {
|
||||
String patternString = useRegex ? term.trim() : Pattern.quote(term.trim());
|
||||
|
||||
if (wholeWordSearch) {
|
||||
patternString = applyWordBoundaries(term.trim(), patternString);
|
||||
}
|
||||
|
||||
Pattern pattern =
|
||||
Pattern.compile(
|
||||
patternString, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
|
||||
patterns.add(pattern);
|
||||
|
||||
log.debug("Created search pattern: '{}' -> '{}'", term.trim(), patternString);
|
||||
|
||||
} catch (Exception e) {
|
||||
log.warn("Failed to create pattern for term '{}': {}", term, e.getMessage());
|
||||
}
|
||||
}
|
||||
|
||||
return patterns;
|
||||
}
|
||||
|
||||
private static String applyWordBoundaries(String originalTerm, String patternString) {
|
||||
if (originalTerm.length() == 1 && Character.isDigit(originalTerm.charAt(0))) {
|
||||
return "(?<![\\w])" + patternString + "(?![\\w])";
|
||||
} else if (originalTerm.length() == 1) {
|
||||
return "(?<![\\w])" + patternString + "(?![\\w])";
|
||||
} else {
|
||||
return "\\b" + patternString + "\\b";
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean hasProblematicFonts(PDPage page) {
|
||||
if (page == null) {
|
||||
return false;
|
||||
}
|
||||
|
||||
try {
|
||||
PDResources resources = page.getResources();
|
||||
if (resources == null) {
|
||||
return false;
|
||||
}
|
||||
|
||||
int totalFonts = 0;
|
||||
int completelyUnusableFonts = 0;
|
||||
|
||||
for (org.apache.pdfbox.cos.COSName fontName : resources.getFontNames()) {
|
||||
try {
|
||||
org.apache.pdfbox.pdmodel.font.PDFont font = resources.getFont(fontName);
|
||||
if (font != null) {
|
||||
totalFonts++;
|
||||
if (!validateFontReliability(font)) {
|
||||
completelyUnusableFonts++;
|
||||
}
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.debug("Font loading failed for {}: {}", fontName.getName(), e.getMessage());
|
||||
totalFonts++;
|
||||
}
|
||||
}
|
||||
|
||||
boolean hasProblems = totalFonts > 0 && (completelyUnusableFonts * 2 > totalFonts);
|
||||
log.debug(
|
||||
"Page font analysis: {}/{} fonts are completely unusable - page {} problematic",
|
||||
completelyUnusableFonts,
|
||||
totalFonts,
|
||||
hasProblems ? "IS" : "is NOT");
|
||||
|
||||
return hasProblems;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.warn("Font analysis failed for page: {}", e.getMessage());
|
||||
return false; // Be permissive if analysis fails
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,136 @@
|
||||
package stirling.software.SPDF.utils.text;
|
||||
|
||||
import org.apache.pdfbox.pdmodel.common.PDRectangle;
|
||||
import org.apache.pdfbox.pdmodel.font.PDFont;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
@Slf4j
|
||||
public class WidthCalculator {
|
||||
|
||||
private static final int FONT_SCALE_FACTOR = 1000;
|
||||
|
||||
public static float calculateAccurateWidth(PDFont font, String text, float fontSize) {
|
||||
if (font == null || text == null || text.isEmpty() || fontSize <= 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!TextEncodingHelper.canEncodeCharacters(font, text)) {
|
||||
log.debug(
|
||||
"Text cannot be encoded by font {}, using fallback width calculation",
|
||||
font.getName());
|
||||
return calculateFallbackWidth(font, text, fontSize);
|
||||
}
|
||||
|
||||
try {
|
||||
float rawWidth = font.getStringWidth(text);
|
||||
float scaledWidth = (rawWidth / FONT_SCALE_FACTOR) * fontSize;
|
||||
|
||||
log.debug(
|
||||
"Direct width calculation successful for font {}: {} -> {}",
|
||||
font.getName(),
|
||||
rawWidth,
|
||||
scaledWidth);
|
||||
return scaledWidth;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.debug(
|
||||
"Direct width calculation failed for font {}: {}",
|
||||
font.getName(),
|
||||
e.getMessage());
|
||||
return calculateWidthWithCharacterIteration(font, text, fontSize);
|
||||
}
|
||||
}
|
||||
|
||||
private static float calculateWidthWithCharacterIteration(
|
||||
PDFont font, String text, float fontSize) {
|
||||
try {
|
||||
float totalWidth = 0;
|
||||
|
||||
for (int i = 0; i < text.length(); i++) {
|
||||
String character = text.substring(i, i + 1);
|
||||
try {
|
||||
byte[] encoded = font.encode(character);
|
||||
if (encoded.length > 0) {
|
||||
int glyphCode = encoded[0] & 0xFF;
|
||||
float glyphWidth = font.getWidth(glyphCode);
|
||||
|
||||
if (glyphWidth == 0) {
|
||||
try {
|
||||
glyphWidth = font.getWidthFromFont(glyphCode);
|
||||
} catch (Exception e2) {
|
||||
glyphWidth = font.getAverageFontWidth();
|
||||
}
|
||||
}
|
||||
|
||||
totalWidth += (glyphWidth / FONT_SCALE_FACTOR) * fontSize;
|
||||
} else {
|
||||
totalWidth += (font.getAverageFontWidth() / FONT_SCALE_FACTOR) * fontSize;
|
||||
}
|
||||
} catch (Exception e2) {
|
||||
totalWidth += (font.getAverageFontWidth() / FONT_SCALE_FACTOR) * fontSize;
|
||||
}
|
||||
}
|
||||
|
||||
log.debug("Character iteration width calculation: {}", totalWidth);
|
||||
return totalWidth;
|
||||
|
||||
} catch (Exception e) {
|
||||
log.debug("Character iteration failed: {}", e.getMessage());
|
||||
return calculateFallbackWidth(font, text, fontSize);
|
||||
}
|
||||
}
|
||||
|
||||
private static float calculateFallbackWidth(PDFont font, String text, float fontSize) {
|
||||
try {
|
||||
if (font.getFontDescriptor() != null
|
||||
&& font.getFontDescriptor().getFontBoundingBox() != null) {
|
||||
|
||||
PDRectangle bbox = font.getFontDescriptor().getFontBoundingBox();
|
||||
float avgCharWidth =
|
||||
bbox.getWidth() / FONT_SCALE_FACTOR * 0.6f; // Conservative estimate
|
||||
float fallbackWidth = text.length() * avgCharWidth * fontSize;
|
||||
|
||||
log.debug("Bounding box fallback width: {}", fallbackWidth);
|
||||
return fallbackWidth;
|
||||
}
|
||||
|
||||
float avgWidth = font.getAverageFontWidth();
|
||||
float fallbackWidth = (text.length() * avgWidth / FONT_SCALE_FACTOR) * fontSize;
|
||||
|
||||
log.debug("Average width fallback: {}", fallbackWidth);
|
||||
return fallbackWidth;
|
||||
|
||||
} catch (Exception e) {
|
||||
float conservativeWidth = text.length() * 0.5f * fontSize;
|
||||
log.debug(
|
||||
"Conservative fallback width for font {}: {}",
|
||||
font.getName(),
|
||||
conservativeWidth);
|
||||
return conservativeWidth;
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean isWidthCalculationReliable(PDFont font) {
|
||||
if (font == null) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (font.isDamaged()) {
|
||||
log.debug("Font {} is damaged", font.getName());
|
||||
return false;
|
||||
}
|
||||
|
||||
if (!TextEncodingHelper.canCalculateBasicWidths(font)) {
|
||||
log.debug("Font {} cannot perform basic width calculations", font.getName());
|
||||
return false;
|
||||
}
|
||||
|
||||
if (TextEncodingHelper.hasCustomEncoding(font)) {
|
||||
log.debug("Font {} has custom encoding", font.getName());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
@ -1,7 +1,5 @@
|
||||
package stirling.software.SPDF.pdf;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.*;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.util.List;
|
||||
|
||||
@ -12,6 +10,11 @@ import org.apache.pdfbox.pdmodel.common.PDRectangle;
|
||||
import org.apache.pdfbox.pdmodel.font.PDType1Font;
|
||||
import org.apache.pdfbox.pdmodel.font.Standard14Fonts;
|
||||
import org.junit.jupiter.api.AfterEach;
|
||||
import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
|
||||
import static org.junit.jupiter.api.Assertions.assertEquals;
|
||||
import static org.junit.jupiter.api.Assertions.assertFalse;
|
||||
import static org.junit.jupiter.api.Assertions.assertNotNull;
|
||||
import static org.junit.jupiter.api.Assertions.assertTrue;
|
||||
import org.junit.jupiter.api.BeforeEach;
|
||||
import org.junit.jupiter.api.DisplayName;
|
||||
import org.junit.jupiter.api.Nested;
|
||||
@ -468,6 +471,106 @@ class TextFinderTest {
|
||||
}
|
||||
}
|
||||
|
||||
@Nested
|
||||
@DisplayName("Single Character and Digit Tests")
|
||||
class SingleCharacterAndDigitTests {
|
||||
|
||||
@Test
|
||||
@DisplayName("Should find single digits in various contexts with whole word search")
|
||||
void findSingleDigitsWholeWord() throws IOException {
|
||||
String content = "Item 1 of 5 costs $2.50. Order number: 1234. Reference: A1B.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder = new TextFinder("1", false, true);
|
||||
textFinder.getText(document);
|
||||
List<PDFText> foundTexts = textFinder.getFoundTexts();
|
||||
|
||||
assertEquals(1, foundTexts.size(),
|
||||
"Should find exactly one standalone '1', not the ones embedded in other numbers/codes");
|
||||
assertEquals("1", foundTexts.get(0).getText());
|
||||
}
|
||||
|
||||
@Test
|
||||
@DisplayName("Should find single digits without whole word search")
|
||||
void findSingleDigitsNoWholeWord() throws IOException {
|
||||
String content = "Item 1 of 5 costs $2.50. Order number: 1234. Reference: A1B.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder = new TextFinder("1", false, false);
|
||||
textFinder.getText(document);
|
||||
List<PDFText> foundTexts = textFinder.getFoundTexts();
|
||||
|
||||
assertTrue(foundTexts.size() >= 3,
|
||||
"Should find multiple instances of '1' including standalone, in '1234', and in 'A1B'");
|
||||
}
|
||||
|
||||
@Test
|
||||
@DisplayName("Should find single characters in various contexts")
|
||||
void findSingleCharacters() throws IOException {
|
||||
String content = "Grade: A. Section B has item A-1. The letter A appears multiple times.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder = new TextFinder("A", false, true);
|
||||
textFinder.getText(document);
|
||||
List<PDFText> foundTexts = textFinder.getFoundTexts();
|
||||
|
||||
assertTrue(foundTexts.size() >= 2, "Should find multiple standalone 'A' characters");
|
||||
|
||||
for (PDFText found : foundTexts) {
|
||||
assertEquals("A", found.getText());
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
@DisplayName("Should handle digits at word boundaries correctly")
|
||||
void findDigitsAtWordBoundaries() throws IOException {
|
||||
String content = "Numbers: 1, 2, 3. Code: 123. Version: 1.0. Item1 and Item2.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder1 = new TextFinder("1", false, true);
|
||||
textFinder1.getText(document);
|
||||
List<PDFText> foundTexts1 = textFinder1.getFoundTexts();
|
||||
|
||||
assertEquals(1, foundTexts1.size(),
|
||||
"Should find only the standalone '1' at the beginning");
|
||||
|
||||
TextFinder textFinder2 = new TextFinder("2", false, true);
|
||||
textFinder2.getText(document);
|
||||
List<PDFText> foundTexts2 = textFinder2.getFoundTexts();
|
||||
|
||||
assertEquals(1, foundTexts2.size(),
|
||||
"Should find only the standalone '2' in the number list");
|
||||
}
|
||||
|
||||
@Test
|
||||
@DisplayName("Should handle special characters and punctuation boundaries")
|
||||
void findDigitsWithPunctuationBoundaries() throws IOException {
|
||||
String content = "Items: (1), [2], {3}, item#4, price$5, and 6%.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder = new TextFinder("1", false, true);
|
||||
textFinder.getText(document);
|
||||
List<PDFText> foundTexts = textFinder.getFoundTexts();
|
||||
|
||||
assertEquals(1, foundTexts.size(), "Should find '1' surrounded by parentheses");
|
||||
assertEquals("1", foundTexts.get(0).getText());
|
||||
}
|
||||
|
||||
@Test
|
||||
@DisplayName("Should handle edge case with spacing and formatting")
|
||||
void findDigitsWithSpacingIssues() throws IOException {
|
||||
String content = "List: 1 , 2 , 3 and item 1 here.";
|
||||
addTextToPage(content);
|
||||
|
||||
TextFinder textFinder = new TextFinder("1", false, true);
|
||||
textFinder.getText(document);
|
||||
List<PDFText> foundTexts = textFinder.getFoundTexts();
|
||||
|
||||
assertEquals(2, foundTexts.size(),
|
||||
"Should find both '1' instances despite spacing variations");
|
||||
}
|
||||
}
|
||||
|
||||
// Helper methods
|
||||
private void addTextToPage(String text) throws IOException {
|
||||
addTextToPage(page, text);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user