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- /*
- * SonarQube
- * Copyright (C) 2009-2021 SonarSource SA
- * mailto:info AT sonarsource DOT com
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- package org.sonar.server.source;
-
- import com.google.common.io.Closeables;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.StringReader;
- import java.util.Collection;
- import java.util.List;
- import javax.annotation.Nullable;
- import org.sonar.api.utils.log.Loggers;
-
- import static com.google.common.collect.Lists.newArrayList;
-
- class HtmlTextDecorator {
-
- static final char CR_END_OF_LINE = '\r';
- static final char LF_END_OF_LINE = '\n';
- static final char HTML_OPENING = '<';
- static final char HTML_CLOSING = '>';
- static final char AMPERSAND = '&';
- static final String ENCODED_HTML_OPENING = "<";
- static final String ENCODED_HTML_CLOSING = ">";
- static final String ENCODED_AMPERSAND = "&";
-
- List<String> decorateTextWithHtml(String text, DecorationDataHolder decorationDataHolder) {
- return decorateTextWithHtml(text, decorationDataHolder, null, null);
- }
-
- List<String> decorateTextWithHtml(String text, DecorationDataHolder decorationDataHolder, @Nullable Integer from, @Nullable Integer to) {
-
- StringBuilder currentHtmlLine = new StringBuilder();
- List<String> decoratedHtmlLines = newArrayList();
- int currentLine = 1;
-
- BufferedReader stringBuffer = null;
- try {
- stringBuffer = new BufferedReader(new StringReader(text));
-
- CharactersReader charsReader = new CharactersReader(stringBuffer);
-
- while (charsReader.readNextChar()) {
- if (shouldStop(currentLine, to)) {
- break;
- }
- if (shouldStartNewLine(charsReader)) {
- if (canAddLine(currentLine, from)) {
- decoratedHtmlLines.add(currentHtmlLine.toString());
- }
- currentLine++;
- currentHtmlLine = new StringBuilder();
- }
- addCharToCurrentLine(charsReader, currentHtmlLine, decorationDataHolder);
- }
-
- closeCurrentSyntaxTags(charsReader, currentHtmlLine);
-
- if (shouldStartNewLine(charsReader)) {
- addLine(decoratedHtmlLines, currentHtmlLine.toString(), currentLine, from, to);
- currentLine++;
- addLine(decoratedHtmlLines, "", currentLine, from, to);
- } else if (currentHtmlLine.length() > 0) {
- addLine(decoratedHtmlLines, currentHtmlLine.toString(), currentLine, from, to);
- }
-
- } catch (IOException exception) {
- String errorMsg = "An exception occurred while highlighting the syntax of one of the project's files";
- Loggers.get(HtmlTextDecorator.class).error(errorMsg);
- throw new IllegalStateException(errorMsg, exception);
- } finally {
- Closeables.closeQuietly(stringBuffer);
- }
-
- return decoratedHtmlLines;
- }
-
- private void addCharToCurrentLine(CharactersReader charsReader, StringBuilder currentHtmlLine, DecorationDataHolder decorationDataHolder) {
- if (shouldStartNewLine(charsReader)) {
- if (shouldReopenPendingTags(charsReader)) {
- reopenCurrentSyntaxTags(charsReader, currentHtmlLine);
- }
- }
-
- int numberOfTagsToClose = getNumberOfTagsToClose(charsReader.getCurrentIndex(), decorationDataHolder);
- closeCompletedTags(charsReader, numberOfTagsToClose, currentHtmlLine);
-
- if (shouldClosePendingTags(charsReader)) {
- closeCurrentSyntaxTags(charsReader, currentHtmlLine);
- }
-
- Collection<String> tagsToOpen = getTagsToOpen(charsReader.getCurrentIndex(), decorationDataHolder);
- openNewTags(charsReader, tagsToOpen, currentHtmlLine);
-
- if (shouldAppendCharToHtmlOutput(charsReader)) {
- char currentChar = (char) charsReader.getCurrentValue();
- currentHtmlLine.append(normalize(currentChar));
- }
- }
-
- private static void addLine(List<String> decoratedHtmlLines, String line, int currentLine, @Nullable Integer from, @Nullable Integer to) {
- if (canAddLine(currentLine, from) && !shouldStop(currentLine, to)) {
- decoratedHtmlLines.add(line);
- }
- }
-
- private static boolean canAddLine(int currentLine, @Nullable Integer from) {
- return from == null || currentLine >= from;
- }
-
- private static boolean shouldStop(int currentLine, @Nullable Integer to) {
- return to != null && to < currentLine;
- }
-
- private static char[] normalize(char currentChar) {
- char[] normalizedChars;
- if (currentChar == HTML_OPENING) {
- normalizedChars = ENCODED_HTML_OPENING.toCharArray();
- } else if (currentChar == HTML_CLOSING) {
- normalizedChars = ENCODED_HTML_CLOSING.toCharArray();
- } else if (currentChar == AMPERSAND) {
- normalizedChars = ENCODED_AMPERSAND.toCharArray();
- } else {
- normalizedChars = new char[] {currentChar};
- }
- return normalizedChars;
- }
-
- private static boolean shouldAppendCharToHtmlOutput(CharactersReader charsReader) {
- return charsReader.getCurrentValue() != CR_END_OF_LINE && charsReader.getCurrentValue() != LF_END_OF_LINE;
- }
-
- private static int getNumberOfTagsToClose(int currentIndex, DecorationDataHolder dataHolder) {
- int numberOfTagsToClose = 0;
-
- while (currentIndex == dataHolder.getCurrentClosingTagOffset()) {
- numberOfTagsToClose++;
- dataHolder.nextClosingTagOffset();
- }
- return numberOfTagsToClose;
- }
-
- private static Collection<String> getTagsToOpen(int currentIndex, DecorationDataHolder dataHolder) {
- Collection<String> tagsToOpen = newArrayList();
- while (dataHolder.getCurrentOpeningTagEntry() != null && currentIndex == dataHolder.getCurrentOpeningTagEntry().getStartOffset()) {
- tagsToOpen.add(dataHolder.getCurrentOpeningTagEntry().getCssClass());
- dataHolder.nextOpeningTagEntry();
- }
- return tagsToOpen;
- }
-
- private static boolean shouldClosePendingTags(CharactersReader charactersReader) {
- return charactersReader.getCurrentValue() == CR_END_OF_LINE
- || (charactersReader.getCurrentValue() == LF_END_OF_LINE && charactersReader.getPreviousValue() != CR_END_OF_LINE)
- || (charactersReader.getCurrentValue() == CharactersReader.END_OF_STREAM && charactersReader.getPreviousValue() != LF_END_OF_LINE);
- }
-
- private static boolean shouldReopenPendingTags(CharactersReader charactersReader) {
- return (charactersReader.getPreviousValue() == LF_END_OF_LINE && charactersReader.getCurrentValue() != LF_END_OF_LINE)
- || (charactersReader.getPreviousValue() == CR_END_OF_LINE && charactersReader.getCurrentValue() != CR_END_OF_LINE
- && charactersReader.getCurrentValue() != LF_END_OF_LINE);
- }
-
- private static boolean shouldStartNewLine(CharactersReader charactersReader) {
- return charactersReader.getPreviousValue() == LF_END_OF_LINE
- || (charactersReader.getPreviousValue() == CR_END_OF_LINE && charactersReader.getCurrentValue() != LF_END_OF_LINE);
- }
-
- private static void closeCompletedTags(CharactersReader charactersReader, int numberOfTagsToClose,
- StringBuilder decoratedText) {
- for (int i = 0; i < numberOfTagsToClose; i++) {
- injectClosingHtml(decoratedText);
- charactersReader.removeLastOpenTag();
- }
- }
-
- private static void openNewTags(CharactersReader charactersReader, Collection<String> tagsToOpen,
- StringBuilder decoratedText) {
- for (String tagToOpen : tagsToOpen) {
- injectOpeningHtmlForRule(tagToOpen, decoratedText);
- charactersReader.registerOpenTag(tagToOpen);
- }
- }
-
- private static void closeCurrentSyntaxTags(CharactersReader charactersReader, StringBuilder decoratedText) {
- for (int i = 0; i < charactersReader.getOpenTags().size(); i++) {
- injectClosingHtml(decoratedText);
- }
- }
-
- private static void reopenCurrentSyntaxTags(CharactersReader charactersReader, StringBuilder decoratedText) {
- for (String tags : charactersReader.getOpenTags()) {
- injectOpeningHtmlForRule(tags, decoratedText);
- }
- }
-
- private static void injectOpeningHtmlForRule(String textType, StringBuilder decoratedText) {
- decoratedText.append("<span class=\"").append(textType).append("\">");
- }
-
- private static void injectClosingHtml(StringBuilder decoratedText) {
- decoratedText.append("</span>");
- }
- }
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