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pdfHTML is an iText 7 add-on that lets you to parse (X)HTML snippets and the associated CSS and converts
them to PDF.
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2020 iText Group NV
Authors: iText Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see true in case any non-page(s) target-counter(s) are present in CSS declarations,
* or false otherwise
*/
public static boolean checkNonPagesTargetCounterPresence(CssStyleSheet styleSheet) {
return checkNonPagesTargetCounterPresence(styleSheet.getStatements());
}
private static boolean checkNonPagesTargetCounterPresence(Collection statements) {
boolean nonPagesTargetCounterPresent = false;
for (final CssStatement statement : statements) {
boolean checkNonPagesTargetCounterPresenceResult = false;
if (statement instanceof CssMarginRule) {
checkNonPagesTargetCounterPresenceResult =
checkNonPagesTargetCounterPresence(((CssMarginRule) statement).getStatements());
} else if (statement instanceof CssMediaRule) {
checkNonPagesTargetCounterPresenceResult =
checkNonPagesTargetCounterPresence(((CssMediaRule) statement).getStatements());
} else if (statement instanceof CssPageRule) {
checkNonPagesTargetCounterPresenceResult =
checkNonPagesTargetCounterPresence(((CssPageRule) statement).getStatements());
} else if (statement instanceof CssRuleSet) {
checkNonPagesTargetCounterPresenceResult =
checkNonPagesTargetCounterPresence((CssRuleSet) statement);
}
nonPagesTargetCounterPresent = nonPagesTargetCounterPresent || checkNonPagesTargetCounterPresenceResult;
}
return nonPagesTargetCounterPresent;
}
private static boolean checkNonPagesTargetCounterPresence(CssRuleSet ruleSet) {
boolean pagesCounterPresent = false;
for (final CssDeclaration declaration : ruleSet.getImportantDeclarations()) {
pagesCounterPresent = pagesCounterPresent || checkNonPagesTargetCounterPresence(declaration);
}
for (final CssDeclaration declaration : ruleSet.getNormalDeclarations()) {
pagesCounterPresent = pagesCounterPresent || checkNonPagesTargetCounterPresence(declaration);
}
return pagesCounterPresent;
}
private static boolean checkNonPagesTargetCounterPresence(CssDeclaration declaration) {
boolean nonPagesTargetCounterPresent = false;
if (CssConstants.CONTENT.equals(declaration.getProperty())) {
CssDeclarationValueTokenizer tokenizer = new CssDeclarationValueTokenizer(declaration.getExpression());
CssDeclarationValueTokenizer.Token token;
while ((token = tokenizer.getNextValidToken()) != null) {
if (token.isString()) {
continue;
}
if (token.getValue().startsWith(CssConstants.TARGET_COUNTER + "(")) {
final String paramsStr = token.getValue()
.substring(CssConstants.TARGET_COUNTER.length() + 1, token.getValue().length() - 1);
final String[] params = paramsStr.split(",");
nonPagesTargetCounterPresent = nonPagesTargetCounterPresent ||
(params.length >= TARGET_COUNTER_MIN_PARAMS_SIZE &&
!checkTargetCounterParamsForPageOrPagesReferencePresence(params));
} else if (token.getValue().startsWith(CssConstants.TARGET_COUNTERS + "(")) {
final String paramsStr = token.getValue()
.substring(CssConstants.TARGET_COUNTERS.length() + 1, token.getValue().length() - 1);
final String[] params = paramsStr.split(",");
nonPagesTargetCounterPresent = nonPagesTargetCounterPresent ||
(params.length >= TARGET_COUNTERS_MIN_PARAMS_SIZE &&
!checkTargetCounterParamsForPageOrPagesReferencePresence(params));
}
}
}
return nonPagesTargetCounterPresent;
}
/**
* Helper method to check if counter(pages) or counters(pages) is present anywhere in the CSS.
* If the presence is detected, it may require additional treatment
*
* @param styleSheet CSS stylesheet to analyze
* @return true in case any "pages" counters are present in CSS declarations,
* or false otherwise
*/
public static boolean checkPagesCounterPresence(CssStyleSheet styleSheet) {
return checkPagesCounterPresence(styleSheet.getStatements());
}
private static boolean checkPagesCounterPresence(Collection statements) {
boolean pagesCounterPresent = false;
for (CssStatement statement : statements) {
if (statement instanceof CssMarginRule) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence(((CssMarginRule) statement).getStatements());
} else if (statement instanceof CssMediaRule) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence(((CssMediaRule) statement).getStatements());
} else if (statement instanceof CssPageRule) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence(((CssPageRule) statement).getStatements());
} else if (statement instanceof CssRuleSet) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence((CssRuleSet) statement);
}
}
return pagesCounterPresent;
}
private static boolean checkPagesCounterPresence(CssRuleSet ruleSet) {
boolean pagesCounterPresent = false;
for (CssDeclaration declaration : ruleSet.getImportantDeclarations()) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence(declaration);
}
for (CssDeclaration declaration : ruleSet.getNormalDeclarations()) {
pagesCounterPresent = pagesCounterPresent || checkPagesCounterPresence(declaration);
}
return pagesCounterPresent;
}
private static boolean checkPagesCounterPresence(CssDeclaration declaration) {
boolean pagesCounterPresent = false;
// MDN: The counters() function can be used with any CSS property, but support for properties other
// than content is experimental, and support for the type-or-unit parameter is sparse.
// iText also does not support counter(pages) anywhere else for now
if (CssConstants.CONTENT.equals(declaration.getProperty())) {
CssDeclarationValueTokenizer tokenizer = new CssDeclarationValueTokenizer(declaration.getExpression());
CssDeclarationValueTokenizer.Token token;
while ((token = tokenizer.getNextValidToken()) != null) {
if (token.isString()) {
continue;
}
if (token.getValue().startsWith(CssConstants.COUNTERS + "(")) {
String paramsStr = token.getValue().substring(CssConstants.COUNTERS.length() + 1, token.getValue().length() - 1);
String[] params = paramsStr.split(",");
pagesCounterPresent = pagesCounterPresent || checkCounterFunctionParamsForPagesReferencePresence(params);
} else if (token.getValue().startsWith(CssConstants.COUNTER + "(")) {
String paramsStr = token.getValue().substring(CssConstants.COUNTER.length() + 1, token.getValue().length() - 1);
String[] params = paramsStr.split(",");
pagesCounterPresent = pagesCounterPresent || checkCounterFunctionParamsForPagesReferencePresence(params);
} else if (token.getValue().startsWith(CssConstants.TARGET_COUNTER + "(")) {
final String paramsStr = token.getValue()
.substring(CssConstants.TARGET_COUNTER.length() + 1, token.getValue().length() - 1);
final String[] params = paramsStr.split(",");
pagesCounterPresent = pagesCounterPresent ||
(params.length >= TARGET_COUNTER_MIN_PARAMS_SIZE &&
checkTargetCounterParamsForPageOrPagesReferencePresence(params));
} else if (token.getValue().startsWith(CssConstants.TARGET_COUNTERS + "(")) {
final String paramsStr = token.getValue()
.substring(CssConstants.TARGET_COUNTERS.length() + 1, token.getValue().length() - 1);
final String[] params = paramsStr.split(",");
pagesCounterPresent = pagesCounterPresent ||
(params.length >= TARGET_COUNTERS_MIN_PARAMS_SIZE &&
checkTargetCounterParamsForPageOrPagesReferencePresence(params));
}
}
}
return pagesCounterPresent;
}
private static boolean checkCounterFunctionParamsForPagesReferencePresence(String[] params) {
return params.length > 0 && CssConstants.PAGES.equals(params[0].trim());
}
private static boolean checkTargetCounterParamsForPageOrPagesReferencePresence(String[] params) {
return CssConstants.PAGE.equals(params[1].trim()) || CssConstants.PAGES.equals(params[1].trim());
}
}