mirror of
https://github.com/Frooodle/Stirling-PDF.git
synced 2025-09-08 17:51:20 +02:00
enhance kerning adjustments and improve text handling in RedactionService and TextFinder
Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
This commit is contained in:
Balázs Szücs
parent
150174cba9
commit
e396b6cbb8
@ -6,6 +6,7 @@ import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import lombok.Getter;
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import org.apache.pdfbox.pdmodel.PDPage;
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import org.apache.pdfbox.text.PDFTextStripper;
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import org.apache.pdfbox.text.TextPosition;
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@ -20,6 +21,7 @@ public class TextFinder extends PDFTextStripper {
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private final String searchTerm;
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private final boolean useRegex;
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private final boolean wholeWordSearch;
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@Getter
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private final List<PDFText> foundTexts = new ArrayList<>();
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private final List<TextPosition> pageTextPositions = new ArrayList<>();
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@ -68,11 +70,17 @@ public class TextFinder extends PDFTextStripper {
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}
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String processedSearchTerm = this.searchTerm.trim();
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if (processedSearchTerm.isEmpty()) {
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super.endPage(page);
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return;
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}
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String regex = this.useRegex ? processedSearchTerm : "\\Q" + processedSearchTerm + "\\E";
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if (this.wholeWordSearch) {
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if (processedSearchTerm.length() == 1
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&& Character.isDigit(processedSearchTerm.charAt(0))) {
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regex = "(?<![\\w])" + regex + "(?![\\w])";
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regex = "(?<![\\w])(?<!\\d[\\.,])" + regex + "(?![\\w])(?![\\.,]\\d)";
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} else if (processedSearchTerm.length() == 1) {
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regex = "(?<![\\w])" + regex + "(?![\\w])";
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} else {
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@ -184,10 +192,6 @@ public class TextFinder extends PDFTextStripper {
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super.endPage(page);
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}
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public List<PDFText> getFoundTexts() {
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return foundTexts;
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}
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public String getDebugInfo() {
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StringBuilder debug = new StringBuilder();
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debug.append("Extracted text length: ").append(pageTextBuilder.length()).append("\n");
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@ -1104,97 +1104,39 @@ public class RedactionService {
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return allMatches;
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}
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private List<Object> applyRedactionsToTokens(
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List<Object> tokens, List<TextSegment> textSegments, List<MatchRange> matches) {
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List<Object> newTokens = new ArrayList<>(tokens);
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if (this.aggressiveMode) {
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Map<Integer, List<AggressiveSegMatch>> perSeg = this.aggressiveSegMatches;
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if (perSeg != null && !perSeg.isEmpty()) {
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List<Integer> segIndices = new ArrayList<>(perSeg.keySet());
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segIndices.sort(
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(a, b) ->
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Integer.compare(
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textSegments.get(b).tokenIndex,
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textSegments.get(a).tokenIndex));
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for (Integer segIndex : segIndices) {
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TextSegment segment = textSegments.get(segIndex);
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List<AggressiveSegMatch> segMatches = perSeg.getOrDefault(segIndex, List.of());
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if (segMatches.isEmpty()) {
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continue;
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}
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Object token = newTokens.get(segment.tokenIndex);
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String opName = segment.operatorName;
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if (("Tj".equals(opName) || "'".equals(opName) || "\"".equals(opName))
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&& token instanceof COSString cs) {
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COSString redacted =
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redactCosStringByDecodedRanges(segment.font, cs, segMatches);
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newTokens.set(segment.tokenIndex, redacted);
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} else if ("TJ".equals(opName) && token instanceof COSArray arr) {
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COSArray redacted =
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redactTJArrayByDecodedRanges(segment.font, arr, segMatches);
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newTokens.set(segment.tokenIndex, redacted);
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}
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}
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return newTokens;
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}
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}
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Map<Integer, List<MatchRange>> matchesBySegment = new HashMap<>();
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for (MatchRange match : matches) {
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for (int i = 0; i < textSegments.size(); i++) {
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TextSegment segment = textSegments.get(i);
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int overlapStart = Math.max(match.startPos, segment.startPos);
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int overlapEnd = Math.min(match.endPos, segment.endPos);
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if (overlapStart < overlapEnd) {
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matchesBySegment.computeIfAbsent(i, k -> new ArrayList<>()).add(match);
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}
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}
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}
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List<ModificationTask> tasks = new ArrayList<>();
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for (Map.Entry<Integer, List<MatchRange>> entry : matchesBySegment.entrySet()) {
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int segmentIndex = entry.getKey();
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List<MatchRange> segmentMatches = entry.getValue();
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if (segmentIndex < 0 || segmentIndex >= textSegments.size()) continue;
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TextSegment segment = textSegments.get(segmentIndex);
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if (segment == null) continue;
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private static String createAlternativePlaceholder(
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String originalWord, float targetWidth, PDFont font, float fontSize) {
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final String repeat =
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" ".repeat(Math.max(1, originalWord != null ? originalWord.length() : 1));
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try {
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if ("Tj".equals(segment.operatorName) || "'".equals(segment.operatorName)) {
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String newText = applyRedactionsToSegmentText(segment, segmentMatches);
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if (newText == null) newText = "";
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float adjustment = calculateWidthAdjustment(segment, segmentMatches);
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tasks.add(new ModificationTask(segment, newText, adjustment));
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} else if ("TJ".equals(segment.operatorName)) {
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tasks.add(new ModificationTask(segment, "", 0));
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}
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} catch (Exception e) {
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// Skip this segment
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String[] alternatives = {" ", ".", "-", "_", "~", "°", "·"};
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if (TextEncodingHelper.fontSupportsCharacter(font, " ")) {
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float spaceWidth = WidthCalculator.calculateAccurateWidth(font, " ", 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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int maxSpaces = (originalWord != null ? originalWord.length() : 1) * 2;
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return " ".repeat(Math.min(spaceCount, maxSpaces));
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}
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}
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tasks.sort((a, b) -> Integer.compare(b.segment.tokenIndex, a.segment.tokenIndex));
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int maxTasksToProcess = Math.min(tasks.size(), 1000);
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for (int i = 0; i < maxTasksToProcess && i < tasks.size(); i++) {
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ModificationTask task = tasks.get(i);
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for (String alt : alternatives) {
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if (" ".equals(alt)) continue;
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try {
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List<MatchRange> segmentMatches =
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matchesBySegment.getOrDefault(
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textSegments.indexOf(task.segment), Collections.emptyList());
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if (task.segment.tokenIndex >= newTokens.size()) continue;
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if (task.segment.getText() == null || task.segment.getText().isEmpty()) continue;
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modifyTokenForRedaction(
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newTokens, task.segment, task.newText, task.adjustment, segmentMatches);
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if (!TextEncodingHelper.fontSupportsCharacter(font, alt)) continue;
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float cw = WidthCalculator.calculateAccurateWidth(font, alt, fontSize);
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if (cw > 0) {
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int count = Math.max(1, Math.round(targetWidth / cw));
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int max = (originalWord != null ? originalWord.length() : 1) * 2;
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return " ".repeat(Math.min(count, max));
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}
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} catch (Exception ignored) {
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}
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}
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return repeat;
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} catch (Exception e) {
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// Skip this task
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return repeat;
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}
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}
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return newTokens;
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}
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private float calculateWidthAdjustment(TextSegment segment, List<MatchRange> matches) {
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if (segment == null
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|| matches == null
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@ -1311,36 +1253,164 @@ public class RedactionService {
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}
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}
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private static String createAlternativePlaceholder(
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String originalWord, float targetWidth, PDFont font, float fontSize) {
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final String repeat =
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" ".repeat(Math.max(1, originalWord != null ? originalWord.length() : 1));
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private List<Object> applyRedactionsToTokens(
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List<Object> tokens, List<TextSegment> textSegments, List<MatchRange> matches) {
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List<Object> newTokens = new ArrayList<>(tokens);
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if (this.aggressiveMode) {
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Map<Integer, List<AggressiveSegMatch>> perSeg = this.aggressiveSegMatches;
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if (perSeg != null && !perSeg.isEmpty()) {
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List<Integer> segIndices = new ArrayList<>(perSeg.keySet());
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segIndices.sort(
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(a, b) ->
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Integer.compare(
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textSegments.get(b).tokenIndex,
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textSegments.get(a).tokenIndex));
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for (Integer segIndex : segIndices) {
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TextSegment segment = textSegments.get(segIndex);
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List<AggressiveSegMatch> segMatches = perSeg.getOrDefault(segIndex, List.of());
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if (segMatches.isEmpty()) {
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continue;
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}
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Object token = newTokens.get(segment.tokenIndex);
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String opName = segment.operatorName;
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if (("Tj".equals(opName) || "'".equals(opName) || "\"".equals(opName))
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&& token instanceof COSString cs) {
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COSString redacted =
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redactCosStringByDecodedRanges(segment.font, cs, segMatches);
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if (segment.font != null && segment.fontSize > 0) {
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String originalText = getDecodedString(cs, segment.font);
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String modifiedText = getDecodedString(redacted, segment.font);
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float wOrig =
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calculateSafeWidth(
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originalText, segment.font, segment.fontSize);
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float wMod =
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calculateSafeWidth(
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modifiedText, segment.font, segment.fontSize);
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float adjustment = wOrig - wMod;
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if (Math.abs(adjustment) > PRECISION_THRESHOLD) {
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COSArray arr = new COSArray();
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arr.add(redacted);
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float kerning =
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(-adjustment / segment.fontSize) * FONT_SCALE_FACTOR;
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arr.add(new COSFloat(kerning));
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newTokens.set(segment.tokenIndex, arr);
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updateOperatorSafely(newTokens, segment.tokenIndex, opName);
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} else {
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newTokens.set(segment.tokenIndex, redacted);
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}
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} else {
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newTokens.set(segment.tokenIndex, redacted);
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}
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} else if ("TJ".equals(opName) && token instanceof COSArray arr) {
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COSArray redacted =
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redactTJArrayByDecodedRanges(segment.font, arr, segMatches);
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// Inject kerning adjustments per string element to preserve layout
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COSArray withKerning = buildKerningAdjustedTJArray(arr, redacted, segment);
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newTokens.set(segment.tokenIndex, withKerning);
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}
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}
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return newTokens;
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}
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}
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Map<Integer, List<MatchRange>> matchesBySegment = new HashMap<>();
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for (MatchRange match : matches) {
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for (int i = 0; i < textSegments.size(); i++) {
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TextSegment segment = textSegments.get(i);
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int overlapStart = Math.max(match.startPos, segment.startPos);
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int overlapEnd = Math.min(match.endPos, segment.endPos);
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if (overlapStart < overlapEnd) {
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matchesBySegment.computeIfAbsent(i, k -> new ArrayList<>()).add(match);
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}
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}
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}
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List<ModificationTask> tasks = new ArrayList<>();
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for (Map.Entry<Integer, List<MatchRange>> entry : matchesBySegment.entrySet()) {
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int segmentIndex = entry.getKey();
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List<MatchRange> segmentMatches = entry.getValue();
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if (segmentIndex < 0 || segmentIndex >= textSegments.size()) continue;
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TextSegment segment = textSegments.get(segmentIndex);
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if (segment == null) continue;
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try {
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String[] alternatives = {" ", ".", "-", "_", "~", "°", "·"};
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if (TextEncodingHelper.fontSupportsCharacter(font, " ")) {
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float spaceWidth = WidthCalculator.calculateAccurateWidth(font, " ", 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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int maxSpaces = originalWord.length() * 2;
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return " ".repeat(Math.min(spaceCount, maxSpaces));
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if ("Tj".equals(segment.operatorName) || "'".equals(segment.operatorName)) {
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String newText = applyRedactionsToSegmentText(segment, segmentMatches);
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if (newText == null) newText = "";
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float adjustment = calculateWidthAdjustment(segment, segmentMatches);
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tasks.add(new ModificationTask(segment, newText, adjustment));
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} else if ("TJ".equals(segment.operatorName)) {
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tasks.add(new ModificationTask(segment, "", 0));
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}
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}
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for (String alt : alternatives) {
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if (" ".equals(alt)) continue;
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try {
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if (!TextEncodingHelper.fontSupportsCharacter(font, alt)) continue;
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float cw = WidthCalculator.calculateAccurateWidth(font, alt, fontSize);
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if (cw > 0) {
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int count = Math.max(1, Math.round(targetWidth / cw));
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int max = originalWord.length() * 2;
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return " ".repeat(Math.min(count, max));
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}
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} catch (Exception ignored) {
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}
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}
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return repeat;
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} catch (Exception e) {
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return repeat;
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// Skip this segment
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}
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}
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tasks.sort((a, b) -> Integer.compare(b.segment.tokenIndex, a.segment.tokenIndex));
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int maxTasksToProcess = Math.min(tasks.size(), 1000);
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for (int i = 0; i < maxTasksToProcess && i < tasks.size(); i++) {
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ModificationTask task = tasks.get(i);
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try {
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List<MatchRange> segmentMatches =
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matchesBySegment.getOrDefault(
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textSegments.indexOf(task.segment), Collections.emptyList());
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if (task.segment.tokenIndex >= newTokens.size()) continue;
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if (task.segment.getText() == null || task.segment.getText().isEmpty()) continue;
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modifyTokenForRedaction(
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newTokens, task.segment, task.newText, task.adjustment, segmentMatches);
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} catch (Exception e) {
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// Skip this task
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}
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}
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return newTokens;
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}
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private COSArray buildKerningAdjustedTJArray(
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COSArray originalArray, COSArray redactedArray, TextSegment segment) {
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try {
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if (segment == null || segment.getFont() == null || segment.getFontSize() <= 0)
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return redactedArray;
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COSArray out = new COSArray();
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int size = redactedArray.size();
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for (int i = 0; i < size; i++) {
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COSBase redEl = redactedArray.get(i);
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COSBase origEl =
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(originalArray != null && i < originalArray.size())
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? originalArray.get(i)
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: null;
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out.add(redEl);
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if (redEl instanceof COSString redStr && origEl instanceof COSString origStr) {
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String origText = getDecodedString(origStr, segment.getFont());
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String modText = getDecodedString(redStr, segment.getFont());
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float wOrig =
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calculateSafeWidth(origText, segment.getFont(), segment.getFontSize());
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float wMod =
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calculateSafeWidth(modText, segment.getFont(), segment.getFontSize());
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float adjustment = wOrig - wMod;
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if (Math.abs(adjustment) > PRECISION_THRESHOLD) {
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float kerning = (-adjustment / segment.getFontSize()) * FONT_SCALE_FACTOR;
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// If next token is a number, combine; otherwise insert new number
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if (i + 1 < size && redactedArray.get(i + 1) instanceof COSNumber num) {
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// Skip adding the next separately and add combined value
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i++;
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float combined = num.floatValue() + kerning;
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out.add(new COSFloat(combined));
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} else {
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out.add(new COSFloat(kerning));
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}
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}
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}
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}
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return out;
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} catch (Exception e) {
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return redactedArray;
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}
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}
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