package org.jsoup.select;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.Comment;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.DocumentType;
import org.jsoup.nodes.Element;
import org.jsoup.nodes.Node;
import org.jsoup.nodes.XmlDeclaration;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Evaluates that an element matches the selector.
*/
public abstract class Evaluator {
protected Evaluator() {
}
/**
* Test if the element meets the evaluator's requirements.
*
* @param root Root of the matching subtree
* @param element tested element
*/
public abstract boolean matches(Element root, Element element);
/**
* Evaluator for tag name
*/
public static final class Tag extends Evaluator {
private String tagName;
public Tag(String tagName) {
this.tagName = tagName;
}
@Override
public boolean matches(Element root, Element element) {
return (element.tagName().equals(tagName));
}
@Override
public String toString() {
return String.format("%s", tagName);
}
}
/**
* Evaluator for element id
*/
public static final class Id extends Evaluator {
private String id;
public Id(String id) {
this.id = id;
}
@Override
public boolean matches(Element root, Element element) {
return (id.equals(element.id()));
}
@Override
public String toString() {
return String.format("#%s", id);
}
}
/**
* Evaluator for element class
*/
public static final class Class extends Evaluator {
private String className;
public Class(String className) {
this.className = className;
}
@Override
public boolean matches(Element root, Element element) {
return (element.hasClass(className));
}
@Override
public String toString() {
return String.format(".%s", className);
}
}
/**
* Evaluator for attribute name matching
*/
public static final class Attribute extends Evaluator {
private String key;
public Attribute(String key) {
this.key = key;
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key);
}
@Override
public String toString() {
return String.format("[%s]", key);
}
}
/**
* Evaluator for attribute name prefix matching
*/
public static final class AttributeStarting extends Evaluator {
private String keyPrefix;
public AttributeStarting(String keyPrefix) {
this.keyPrefix = keyPrefix;
}
@Override
public boolean matches(Element root, Element element) {
List<org.jsoup.nodes.Attribute> values = element.attributes().asList();
for (org.jsoup.nodes.Attribute attribute : values) {
if (attribute.getKey().startsWith(keyPrefix))
return true;
}
return false;
}
@Override
public String toString() {
return String.format("[^%s]", keyPrefix);
}
}
/**
* Evaluator for attribute name/value matching
*/
public static final class AttributeWithValue extends AttributeKeyPair {
public AttributeWithValue(String key, String value) {
super(key, value);
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key) && value.equalsIgnoreCase(element.attr(key));
}
@Override
public String toString() {
return String.format("[%s=%s]", key, value);
}
}
/**
* Evaluator for attribute name != value matching
*/
public static final class AttributeWithValueNot extends AttributeKeyPair {
public AttributeWithValueNot(String key, String value) {
super(key, value);
}
@Override
public boolean matches(Element root, Element element) {
return !value.equalsIgnoreCase(element.attr(key));
}
@Override
public String toString() {
return String.format("[%s!=%s]", key, value);
}
}
/**
* Evaluator for attribute name/value matching (value prefix)
*/
public static final class AttributeWithValueStarting extends AttributeKeyPair {
public AttributeWithValueStarting(String key, String value) {
super(key, value);
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key) && element.attr(key).toLowerCase().startsWith(value); // value is lower case already
}
@Override
public String toString() {
return String.format("[%s^=%s]", key, value);
}
}
/**
* Evaluator for attribute name/value matching (value ending)
*/
public static final class AttributeWithValueEnding extends AttributeKeyPair {
public AttributeWithValueEnding(String key, String value) {
super(key, value);
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key) && element.attr(key).toLowerCase().endsWith(value); // value is lower case
}
@Override
public String toString() {
return String.format("[%s$=%s]", key, value);
}
}
/**
* Evaluator for attribute name/value matching (value containing)
*/
public static final class AttributeWithValueContaining extends AttributeKeyPair {
public AttributeWithValueContaining(String key, String value) {
super(key, value);
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key) && element.attr(key).toLowerCase().contains(value); // value is lower case
}
@Override
public String toString() {
return String.format("[%s*=%s]", key, value);
}
}
/**
* Evaluator for attribute name/value matching (value regex matching)
*/
public static final class AttributeWithValueMatching extends Evaluator {
String key;
Pattern pattern;
public AttributeWithValueMatching(String key, Pattern pattern) {
this.key = key.trim().toLowerCase();
this.pattern = pattern;
}
@Override
public boolean matches(Element root, Element element) {
return element.hasAttr(key) && pattern.matcher(element.attr(key)).find();
}
@Override
public String toString() {
return String.format("[%s~=%s]", key, pattern.toString());
}
}
/**
* Abstract evaluator for attribute name/value matching
*/
public abstract static class AttributeKeyPair extends Evaluator {
String key;
String value;
public AttributeKeyPair(String key, String value) {
Validate.notEmpty(key);
Validate.notEmpty(value);
this.key = key.trim().toLowerCase();
this.value = value.trim().toLowerCase();
}
}
/**
* Evaluator for any / all element matching
*/
public static final class AllElements extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
return true;
}
@Override
public String toString() {
return "*";
}
}
/**
* Evaluator for matching by sibling index number (e < idx)
*/
public static final class IndexLessThan extends IndexEvaluator {
public IndexLessThan(int index) {
super(index);
}
@Override
public boolean matches(Element root, Element element) {
return element.elementSiblingIndex() < index;
}
@Override
public String toString() {
return String.format(":lt(%d)", index);
}
}
/**
* Evaluator for matching by sibling index number (e > idx)
*/
public static final class IndexGreaterThan extends IndexEvaluator {
public IndexGreaterThan(int index) {
super(index);
}
@Override
public boolean matches(Element root, Element element) {
return element.elementSiblingIndex() > index;
}
@Override
public String toString() {
return String.format(":gt(%d)", index);
}
}
/**
* Evaluator for matching by sibling index number (e = idx)
*/
public static final class IndexEquals extends IndexEvaluator {
public IndexEquals(int index) {
super(index);
}
@Override
public boolean matches(Element root, Element element) {
return element.elementSiblingIndex() == index;
}
@Override
public String toString() {
return String.format(":eq(%d)", index);
}
}
/**
* Evaluator for matching the last sibling (css :last-child)
*/
public static final class IsLastChild extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
final Element p = element.parent();
return p != null && !(p instanceof Document) && element.elementSiblingIndex() == p.children().size()-1;
}
@Override
public String toString() {
return ":last-child";
}
}
public static final class IsFirstOfType extends IsNthOfType {
public IsFirstOfType() {
super(0,1);
}
@Override
public String toString() {
return ":first-of-type";
}
}
public static final class IsLastOfType extends IsNthLastOfType {
public IsLastOfType() {
super(0,1);
}
@Override
public String toString() {
return ":last-of-type";
}
}
public static abstract class CssNthEvaluator extends Evaluator {
protected final int a, b;
public CssNthEvaluator(int a, int b) {
this.a = a;
this.b = b;
}
public CssNthEvaluator(int b) {
this(0,b);
}
@Override
public boolean matches(Element root, Element element) {
final Element p = element.parent();
if (p == null || (p instanceof Document)) return false;
final int pos = calculatePosition(root, element);
if (a == 0) return pos == b;
return (pos-b)*a >= 0 && (pos-b)%a==0;
}
@Override
public String toString() {
if (a == 0)
return String.format(":%s(%d)",getPseudoClass(), b);
if (b == 0)
return String.format(":%s(%dn)",getPseudoClass(), a);
return String.format(":%s(%dn%+d)", getPseudoClass(),a, b);
}
protected abstract String getPseudoClass();
protected abstract int calculatePosition(Element root, Element element);
}
/**
* css-compatible Evaluator for :eq (css :nth-child)
*
* @see IndexEquals
*/
public static final class IsNthChild extends CssNthEvaluator {
public IsNthChild(int a, int b) {
super(a,b);
}
protected int calculatePosition(Element root, Element element) {
return element.elementSiblingIndex()+1;
}
protected String getPseudoClass() {
return "nth-child";
}
}
/**
* css pseudo class :nth-last-child)
*
* @see IndexEquals
*/
public static final class IsNthLastChild extends CssNthEvaluator {
public IsNthLastChild(int a, int b) {
super(a,b);
}
@Override
protected int calculatePosition(Element root, Element element) {
return element.parent().children().size() - element.elementSiblingIndex();
}
@Override
protected String getPseudoClass() {
return "nth-last-child";
}
}
/**
* css pseudo class nth-of-type
*
*/
public static class IsNthOfType extends CssNthEvaluator {
public IsNthOfType(int a, int b) {
super(a,b);
}
protected int calculatePosition(Element root, Element element) {
int pos = 0;
Elements family = element.parent().children();
for (int i = 0; i < family.size(); i++) {
if (family.get(i).tag() == element.tag()) pos++;
if (family.get(i) == element) break;
}
return pos;
}
@Override
protected String getPseudoClass() {
return "nth-of-type";
}
}
public static class IsNthLastOfType extends CssNthEvaluator {
public IsNthLastOfType(int a, int b) {
super(a, b);
}
@Override
protected int calculatePosition(Element root, Element element) {
int pos = 0;
Elements family = element.parent().children();
for (int i = element.elementSiblingIndex(); i < family.size(); i++) {
if (family.get(i).tag() == element.tag()) pos++;
}
return pos;
}
@Override
protected String getPseudoClass() {
return "nth-last-of-type";
}
}
/**
* Evaluator for matching the first sibling (css :first-child)
*/
public static final class IsFirstChild extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
final Element p = element.parent();
return p != null && !(p instanceof Document) && element.elementSiblingIndex() == 0;
}
@Override
public String toString() {
return ":first-child";
}
}
/**
* css3 pseudo-class :root
* @see http://www.w3.org/TR/selectors/#root-pseudo
*
*/
public static final class IsRoot extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
final Element r = root instanceof Document?root.child(0):root;
return element == r;
}
@Override
public String toString() {
return ":root";
}
}
public static final class IsOnlyChild extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
final Element p = element.parent();
return p!=null && !(p instanceof Document) && element.siblingElements().size() == 0;
}
@Override
public String toString() {
return ":only-child";
}
}
public static final class IsOnlyOfType extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
final Element p = element.parent();
if (p==null || p instanceof Document) return false;
int pos = 0;
Elements family = p.children();
for (int i = 0; i < family.size(); i++) {
if (family.get(i).tag().equals(element.tag())) pos++;
}
return pos == 1;
}
@Override
public String toString() {
return ":only-of-type";
}
}
public static final class IsEmpty extends Evaluator {
@Override
public boolean matches(Element root, Element element) {
List<Node> family = element.childNodes();
for (int i = 0; i < family.size(); i++) {
Node n = family.get(i);
if (!(n instanceof Comment || n instanceof XmlDeclaration || n instanceof DocumentType)) return false;
}
return true;
}
@Override
public String toString() {
return ":empty";
}
}
/**
* Abstract evaluator for sibling index matching
*
* @author ant
*/
public abstract static class IndexEvaluator extends Evaluator {
int index;
public IndexEvaluator(int index) {
this.index = index;
}
}
/**
* Evaluator for matching Element (and its descendants) text
*/
public static final class ContainsText extends Evaluator {
private String searchText;
public ContainsText(String searchText) {
this.searchText = searchText.toLowerCase();
}
@Override
public boolean matches(Element root, Element element) {
return (element.text().toLowerCase().contains(searchText));
}
@Override
public String toString() {
return String.format(":contains(%s", searchText);
}
}
/**
* Evaluator for matching Element's own text
*/
public static final class ContainsOwnText extends Evaluator {
private String searchText;
public ContainsOwnText(String searchText) {
this.searchText = searchText.toLowerCase();
}
@Override
public boolean matches(Element root, Element element) {
return (element.ownText().toLowerCase().contains(searchText));
}
@Override
public String toString() {
return String.format(":containsOwn(%s", searchText);
}
}
/**
* Evaluator for matching Element (and its descendants) text with regex
*/
public static final class Matches extends Evaluator {
private Pattern pattern;
public Matches(Pattern pattern) {
this.pattern = pattern;
}
@Override
public boolean matches(Element root, Element element) {
Matcher m = pattern.matcher(element.text());
return m.find();
}
@Override
public String toString() {
return String.format(":matches(%s", pattern);
}
}
/**
* Evaluator for matching Element's own text with regex
*/
public static final class MatchesOwn extends Evaluator {
private Pattern pattern;
public MatchesOwn(Pattern pattern) {
this.pattern = pattern;
}
@Override
public boolean matches(Element root, Element element) {
Matcher m = pattern.matcher(element.ownText());
return m.find();
}
@Override
public String toString() {
return String.format(":matchesOwn(%s", pattern);
}
}
}
