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Styled XML parser is used by iText7 modules to parse HTML and XML
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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2024 Apryse Group NV
Authors: Apryse 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 LEGACY_PSEUDO_ELEMENTS;
static {
// HashSet is required in order to autoport correctly in .Net
HashSet tempSet = new HashSet<>();
tempSet.add("first-line");
tempSet.add("first-letter");
tempSet.add("before");
tempSet.add("after");
LEGACY_PSEUDO_ELEMENTS = Collections.unmodifiableSet(tempSet);
}
/**
* The pattern string for selectors.
*/
private static final String SELECTOR_PATTERN_STR =
"(\\*)|([_a-zA-Z][\\w-]*)|(\\.[_a-zA-Z][\\w-]*)|(#[_a-z][\\w-]*)|(\\[[_a-zA-Z][\\w-]*(([~^$*|])?=((\"[^\"]+\")|([^\"]+)|('[^']+')|(\"\")|('')))?\\])|(::?[a-zA-Z-]*)|( )|(\\+)|(>)|(~)";
/**
* The pattern for selectors.
*/
private static final Pattern selectorPattern = Pattern.compile(SELECTOR_PATTERN_STR);
/**
* Creates a new {@link CssSelectorParser} instance.
*/
private CssSelectorParser() {
}
/**
* Parses the selector items.
*
* @param selector the selectors in the form of a {@link String}
* @return the resulting list of {@link ICssSelectorItem}
*/
public static List parseSelectorItems(String selector) {
List selectorItems = new ArrayList<>();
Matcher match = selectorPattern.matcher(selector);
boolean tagSelectorDescription = false;
while (match.find()) {
String selectorItem = match.group(0);
char firstChar = selectorItem.charAt(0);
switch (firstChar) {
case '#':
selectorItems.add(new CssIdSelectorItem(selectorItem.substring(1)));
break;
case '.':
selectorItems.add(new CssClassSelectorItem(selectorItem.substring(1)));
break;
case '[':
selectorItems.add(new CssAttributeSelectorItem(selectorItem));
break;
case ':':
appendPseudoSelector(selectorItems, selectorItem, match, selector);
break;
case ' ':
case '+':
case '>':
case '~':
if (selectorItems.size() == 0) {
throw new IllegalArgumentException(MessageFormatUtil.format(
StyledXmlParserExceptionMessage.INVALID_TOKEN_AT_THE_BEGINNING_OF_SELECTOR,
firstChar));
}
ICssSelectorItem lastItem = selectorItems.get(selectorItems.size() - 1);
CssSeparatorSelectorItem curItem = new CssSeparatorSelectorItem(firstChar);
if (lastItem instanceof CssSeparatorSelectorItem) {
if (curItem.getSeparator() == ' ') {
break;
} else if (((CssSeparatorSelectorItem) lastItem).getSeparator() == ' ') {
selectorItems.set(selectorItems.size() - 1, curItem);
} else {
throw new IllegalArgumentException(MessageFormatUtil.format("Invalid selector description. Two consequent characters occurred: {0}, {1}", ((CssSeparatorSelectorItem) lastItem).getSeparator(), curItem.getSeparator()));
}
} else {
selectorItems.add(curItem);
tagSelectorDescription = false;
}
break;
default: //and case '*':
if (tagSelectorDescription) {
throw new IllegalStateException("Invalid selector string");
}
tagSelectorDescription = true;
selectorItems.add(new CssTagSelectorItem(selectorItem));
break;
}
}
if (selectorItems.size() == 0) {
throw new IllegalArgumentException("Selector declaration is invalid");
}
return selectorItems;
}
/**
* Resolves a pseudo selector and appends it to list.
*
* @param selectorItems list of items to which new selector will be added to
* @param pseudoSelector the pseudo selector
* @param match the corresponding {@link Matcher}.
* @param source is the original source
*/
private static void appendPseudoSelector(List selectorItems, String pseudoSelector,
Matcher match, String source) {
pseudoSelector = pseudoSelector.toLowerCase();
pseudoSelector = handleBracketsOfPseudoSelector(pseudoSelector, match, source);
/*
This :: notation is introduced by the current document in order to establish a discrimination between
pseudo-classes and pseudo-elements.
For compatibility with existing style sheets, user agents must also accept the previous one-colon
notation for pseudo-elements introduced in CSS levels 1 and 2 (namely, :first-line, :first-letter, :before and :after).
This compatibility is not allowed for the new pseudo-elements introduced in this specification.
*/
if (pseudoSelector.startsWith("::")) {
selectorItems.add(new CssPseudoElementSelectorItem(pseudoSelector.substring(2)));
} else if (pseudoSelector.startsWith(":") && LEGACY_PSEUDO_ELEMENTS.contains(pseudoSelector.substring(1))) {
selectorItems.add(new CssPseudoElementSelectorItem(pseudoSelector.substring(1)));
} else {
ICssSelectorItem pseudoClassSelectorItem = CssPseudoClassSelectorItem.create(pseudoSelector.substring(1));
if (pseudoClassSelectorItem == null) {
throw new IllegalArgumentException(
MessageFormatUtil.format(StyledXmlParserLogMessageConstant.UNSUPPORTED_PSEUDO_CSS_SELECTOR,
pseudoSelector));
}
selectorItems.add(pseudoClassSelectorItem);
}
}
/**
* Resolves a pseudo selector if it contains brackets. Updates internal state of
* {@link Matcher} if necessary.
*
* @param pseudoSelector the pseudo selector
* @param match the corresponding {@link Matcher}.
* @param source is the original source
*/
private static String handleBracketsOfPseudoSelector(String pseudoSelector, Matcher match, String source) {
int start = match.start() + pseudoSelector.length();
if (start < source.length() && source.charAt(start) == '(') {
int bracketDepth = 1;
int curr = start + 1;
while(bracketDepth > 0 && curr < source.length()) {
if (source.charAt(curr) == '(') {
++bracketDepth;
} else if (source.charAt(curr) == ')') {
--bracketDepth;
} else if (source.charAt(curr) == '"' || source.charAt(curr) == '\'') {
curr = CssUtils.findNextUnescapedChar(source, source.charAt(curr), curr + 1);
}
++curr;
}
if (bracketDepth == 0) {
match.region(curr, source.length());
pseudoSelector += source.substring(start, curr);
}
}
return pseudoSelector;
}
}
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