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pdfHTML is an iText add-on that lets you to parse (X)HTML snippets and the associated CSS and converts
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package org.jsoup.parser;
import org.jsoup.helper.StringUtil;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.*;
import org.jsoup.select.Elements;
import java.util.ArrayList;
import java.util.List;
/**
* HTML Tree Builder; creates a DOM from Tokens.
*/
public class HtmlTreeBuilder extends TreeBuilder {
// tag searches
public static final String[] TagsSearchInScope = new String[]{"applet", "caption", "html", "table", "td", "th", "marquee", "object"};
private static final String[] TagSearchList = new String[]{"ol", "ul"};
private static final String[] TagSearchButton = new String[]{"button"};
private static final String[] TagSearchTableScope = new String[]{"html", "table"};
private static final String[] TagSearchSelectScope = new String[]{"optgroup", "option"};
private static final String[] TagSearchEndTags = new String[]{"dd", "dt", "li", "option", "optgroup", "p", "rp", "rt"};
private static final String[] TagSearchSpecial = new String[]{"address", "applet", "area", "article", "aside", "base", "basefont", "bgsound",
"blockquote", "body", "br", "button", "caption", "center", "col", "colgroup", "command", "dd",
"details", "dir", "div", "dl", "dt", "embed", "fieldset", "figcaption", "figure", "footer", "form",
"frame", "frameset", "h1", "h2", "h3", "h4", "h5", "h6", "head", "header", "hgroup", "hr", "html",
"iframe", "img", "input", "isindex", "li", "link", "listing", "marquee", "menu", "meta", "nav",
"noembed", "noframes", "noscript", "object", "ol", "p", "param", "plaintext", "pre", "script",
"section", "select", "style", "summary", "table", "tbody", "td", "textarea", "tfoot", "th", "thead",
"title", "tr", "ul", "wbr", "xmp"};
private HtmlTreeBuilderState state; // the current state
private HtmlTreeBuilderState originalState; // original / marked state
private boolean baseUriSetFromDoc = false;
private Element headElement; // the current head element
private FormElement formElement; // the current form element
private Element contextElement; // fragment parse context -- could be null even if fragment parsing
private ArrayList formattingElements = new ArrayList(); // active (open) formatting elements
private List pendingTableCharacters = new ArrayList(); // chars in table to be shifted out
private Token.EndTag emptyEnd = new Token.EndTag(); // reused empty end tag
private boolean framesetOk = true; // if ok to go into frameset
private boolean fosterInserts = false; // if next inserts should be fostered
private boolean fragmentParsing = false; // if parsing a fragment of html
HtmlTreeBuilder() {}
@Override
Document parse(String input, String baseUri, ParseErrorList errors) {
state = HtmlTreeBuilderState.Initial;
baseUriSetFromDoc = false;
return super.parse(input, baseUri, errors);
}
List parseFragment(String inputFragment, Element context, String baseUri, ParseErrorList errors) {
// context may be null
state = HtmlTreeBuilderState.Initial;
initialiseParse(inputFragment, baseUri, errors);
contextElement = context;
fragmentParsing = true;
Element root = null;
if (context != null) {
if (context.ownerDocument() != null) // quirks setup:
doc.quirksMode(context.ownerDocument().quirksMode());
// initialise the tokeniser state:
String contextTag = context.tagName();
if (StringUtil.in(contextTag, "title", "textarea"))
tokeniser.transition(TokeniserState.Rcdata);
else if (StringUtil.in(contextTag, "iframe", "noembed", "noframes", "style", "xmp"))
tokeniser.transition(TokeniserState.Rawtext);
else if (contextTag.equals("script"))
tokeniser.transition(TokeniserState.ScriptData);
else if (contextTag.equals(("noscript")))
tokeniser.transition(TokeniserState.Data); // if scripting enabled, rawtext
else if (contextTag.equals("plaintext"))
tokeniser.transition(TokeniserState.Data);
else
tokeniser.transition(TokeniserState.Data); // default
root = new Element(Tag.valueOf("html"), baseUri);
doc.appendChild(root);
stack.add(root);
resetInsertionMode();
// setup form element to nearest form on context (up ancestor chain). ensures form controls are associated
// with form correctly
Elements contextChain = context.parents();
contextChain.add(0, context);
for (Element parent: contextChain) {
if (parent instanceof FormElement) {
formElement = (FormElement) parent;
break;
}
}
}
runParser();
if (context != null && root != null)
return root.childNodes();
else
return doc.childNodes();
}
@Override
protected boolean process(Token token) {
currentToken = token;
return this.state.process(token, this);
}
boolean process(Token token, HtmlTreeBuilderState state) {
currentToken = token;
return state.process(token, this);
}
void transition(HtmlTreeBuilderState state) {
this.state = state;
}
HtmlTreeBuilderState state() {
return state;
}
void markInsertionMode() {
originalState = state;
}
HtmlTreeBuilderState originalState() {
return originalState;
}
void framesetOk(boolean framesetOk) {
this.framesetOk = framesetOk;
}
boolean framesetOk() {
return framesetOk;
}
Document getDocument() {
return doc;
}
String getBaseUri() {
return baseUri;
}
void maybeSetBaseUri(Element base) {
if (baseUriSetFromDoc) // only listen to the first getStack() {
return stack;
}
boolean onStack(Element el) {
return isElementInQueue(stack, el);
}
private boolean isElementInQueue(ArrayList queue, Element element) {
for (int pos = queue.size() -1; pos >= 0; pos--) {
Element next = queue.get(pos);
if (next == element) {
return true;
}
}
return false;
}
Element getFromStack(String elName) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
if (next.nodeName().equals(elName)) {
return next;
}
}
return null;
}
boolean removeFromStack(Element el) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
if (next == el) {
stack.remove(pos);
return true;
}
}
return false;
}
void popStackToClose(String elName) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
stack.remove(pos);
if (next.nodeName().equals(elName))
break;
}
}
void popStackToClose(String... elNames) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
stack.remove(pos);
if (StringUtil.in(next.nodeName(), elNames))
break;
}
}
void popStackToBefore(String elName) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
if (next.nodeName().equals(elName)) {
break;
} else {
stack.remove(pos);
}
}
}
void clearStackToTableContext() {
clearStackToContext("table");
}
void clearStackToTableBodyContext() {
clearStackToContext("tbody", "tfoot", "thead");
}
void clearStackToTableRowContext() {
clearStackToContext("tr");
}
private void clearStackToContext(String... nodeNames) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
if (StringUtil.in(next.nodeName(), nodeNames) || next.nodeName().equals("html"))
break;
else
stack.remove(pos);
}
}
Element aboveOnStack(Element el) {
assert onStack(el);
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element next = stack.get(pos);
if (next == el) {
return stack.get(pos-1);
}
}
return null;
}
void insertOnStackAfter(Element after, Element in) {
int i = stack.lastIndexOf(after);
Validate.isTrue(i != -1);
stack.add(i+1, in);
}
void replaceOnStack(Element out, Element in) {
replaceInQueue(stack, out, in);
}
private void replaceInQueue(ArrayList queue, Element out, Element in) {
int i = queue.lastIndexOf(out);
Validate.isTrue(i != -1);
queue.set(i, in);
}
void resetInsertionMode() {
boolean last = false;
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element node = stack.get(pos);
if (pos == 0) {
last = true;
node = contextElement;
}
String name = node.nodeName();
if ("select".equals(name)) {
transition(HtmlTreeBuilderState.InSelect);
break; // frag
} else if (("td".equals(name) || "th".equals(name) && !last)) {
transition(HtmlTreeBuilderState.InCell);
break;
} else if ("tr".equals(name)) {
transition(HtmlTreeBuilderState.InRow);
break;
} else if ("tbody".equals(name) || "thead".equals(name) || "tfoot".equals(name)) {
transition(HtmlTreeBuilderState.InTableBody);
break;
} else if ("caption".equals(name)) {
transition(HtmlTreeBuilderState.InCaption);
break;
} else if ("colgroup".equals(name)) {
transition(HtmlTreeBuilderState.InColumnGroup);
break; // frag
} else if ("table".equals(name)) {
transition(HtmlTreeBuilderState.InTable);
break;
} else if ("head".equals(name)) {
transition(HtmlTreeBuilderState.InBody);
break; // frag
} else if ("body".equals(name)) {
transition(HtmlTreeBuilderState.InBody);
break;
} else if ("frameset".equals(name)) {
transition(HtmlTreeBuilderState.InFrameset);
break; // frag
} else if ("html".equals(name)) {
transition(HtmlTreeBuilderState.BeforeHead);
break; // frag
} else if (last) {
transition(HtmlTreeBuilderState.InBody);
break; // frag
}
}
}
// todo: tidy up in specific scope methods
private String[] specificScopeTarget = {null};
private boolean inSpecificScope(String targetName, String[] baseTypes, String[] extraTypes) {
specificScopeTarget[0] = targetName;
return inSpecificScope(specificScopeTarget, baseTypes, extraTypes);
}
private boolean inSpecificScope(String[] targetNames, String[] baseTypes, String[] extraTypes) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element el = stack.get(pos);
String elName = el.nodeName();
if (StringUtil.in(elName, targetNames))
return true;
if (StringUtil.in(elName, baseTypes))
return false;
if (extraTypes != null && StringUtil.in(elName, extraTypes))
return false;
}
Validate.fail("Should not be reachable");
return false;
}
boolean inScope(String[] targetNames) {
return inSpecificScope(targetNames, TagsSearchInScope, null);
}
boolean inScope(String targetName) {
return inScope(targetName, null);
}
boolean inScope(String targetName, String[] extras) {
return inSpecificScope(targetName, TagsSearchInScope, extras);
// todo: in mathml namespace: mi, mo, mn, ms, mtext annotation-xml
// todo: in svg namespace: forignOjbect, desc, title
}
boolean inListItemScope(String targetName) {
return inScope(targetName, TagSearchList);
}
boolean inButtonScope(String targetName) {
return inScope(targetName, TagSearchButton);
}
boolean inTableScope(String targetName) {
return inSpecificScope(targetName, TagSearchTableScope, null);
}
boolean inSelectScope(String targetName) {
for (int pos = stack.size() -1; pos >= 0; pos--) {
Element el = stack.get(pos);
String elName = el.nodeName();
if (elName.equals(targetName))
return true;
if (!StringUtil.in(elName, TagSearchSelectScope)) // all elements except
return false;
}
Validate.fail("Should not be reachable");
return false;
}
void setHeadElement(Element headElement) {
this.headElement = headElement;
}
Element getHeadElement() {
return headElement;
}
boolean isFosterInserts() {
return fosterInserts;
}
void setFosterInserts(boolean fosterInserts) {
this.fosterInserts = fosterInserts;
}
FormElement getFormElement() {
return formElement;
}
void setFormElement(FormElement formElement) {
this.formElement = formElement;
}
void newPendingTableCharacters() {
pendingTableCharacters = new ArrayList();
}
List getPendingTableCharacters() {
return pendingTableCharacters;
}
void setPendingTableCharacters(List pendingTableCharacters) {
this.pendingTableCharacters = pendingTableCharacters;
}
/**
11.2.5.2 Closing elements that have implied end tags
When the steps below require the UA to generate implied end tags, then, while the current node is a dd element, a
dt element, an li element, an option element, an optgroup element, a p element, an rp element, or an rt element,
the UA must pop the current node off the stack of open elements.
@param excludeTag If a step requires the UA to generate implied end tags but lists an element to exclude from the
process, then the UA must perform the above steps as if that element was not in the above list.
*/
void generateImpliedEndTags(String excludeTag) {
while ((excludeTag != null && !currentElement().nodeName().equals(excludeTag)) &&
StringUtil.in(currentElement().nodeName(), TagSearchEndTags))
pop();
}
void generateImpliedEndTags() {
generateImpliedEndTags(null);
}
boolean isSpecial(Element el) {
// todo: mathml's mi, mo, mn
// todo: svg's foreigObject, desc, title
String name = el.nodeName();
return StringUtil.in(name, TagSearchSpecial);
}
Element lastFormattingElement() {
return formattingElements.size() > 0 ? formattingElements.get(formattingElements.size()-1) : null;
}
Element removeLastFormattingElement() {
int size = formattingElements.size();
if (size > 0)
return formattingElements.remove(size-1);
else
return null;
}
// active formatting elements
void pushActiveFormattingElements(Element in) {
int numSeen = 0;
for (int pos = formattingElements.size() -1; pos >= 0; pos--) {
Element el = formattingElements.get(pos);
if (el == null) // marker
break;
if (isSameFormattingElement(in, el))
numSeen++;
if (numSeen == 3) {
formattingElements.remove(pos);
break;
}
}
formattingElements.add(in);
}
private boolean isSameFormattingElement(Element a, Element b) {
// same if: same namespace, tag, and attributes. Element.equals only checks tag, might in future check children
return a.nodeName().equals(b.nodeName()) &&
// a.namespace().equals(b.namespace()) &&
a.attributes().equals(b.attributes());
// todo: namespaces
}
void reconstructFormattingElements() {
Element last = lastFormattingElement();
if (last == null || onStack(last))
return;
Element entry = last;
int size = formattingElements.size();
int pos = size - 1;
boolean skip = false;
while (true) {
if (pos == 0) { // step 4. if none before, skip to 8
skip = true;
break;
}
entry = formattingElements.get(--pos); // step 5. one earlier than entry
if (entry == null || onStack(entry)) // step 6 - neither marker nor on stack
break; // jump to 8, else continue back to 4
}
while(true) {
if (!skip) // step 7: on later than entry
entry = formattingElements.get(++pos);
Validate.notNull(entry); // should not occur, as we break at last element
// 8. create new element from element, 9 insert into current node, onto stack
skip = false; // can only skip increment from 4.
Element newEl = insertStartTag(entry.nodeName()); // todo: avoid fostering here?
// newEl.namespace(entry.namespace()); // todo: namespaces
newEl.attributes().addAll(entry.attributes());
// 10. replace entry with new entry
formattingElements.set(pos, newEl);
// 11
if (pos == size-1) // if not last entry in list, jump to 7
break;
}
}
void clearFormattingElementsToLastMarker() {
while (!formattingElements.isEmpty()) {
Element el = removeLastFormattingElement();
if (el == null)
break;
}
}
void removeFromActiveFormattingElements(Element el) {
for (int pos = formattingElements.size() -1; pos >= 0; pos--) {
Element next = formattingElements.get(pos);
if (next == el) {
formattingElements.remove(pos);
break;
}
}
}
boolean isInActiveFormattingElements(Element el) {
return isElementInQueue(formattingElements, el);
}
Element getActiveFormattingElement(String nodeName) {
for (int pos = formattingElements.size() -1; pos >= 0; pos--) {
Element next = formattingElements.get(pos);
if (next == null) // scope marker
break;
else if (next.nodeName().equals(nodeName))
return next;
}
return null;
}
void replaceActiveFormattingElement(Element out, Element in) {
replaceInQueue(formattingElements, out, in);
}
void insertMarkerToFormattingElements() {
formattingElements.add(null);
}
void insertInFosterParent(Node in) {
Element fosterParent;
Element lastTable = getFromStack("table");
boolean isLastTableParent = false;
if (lastTable != null) {
if (lastTable.parent() != null) {
fosterParent = lastTable.parent();
isLastTableParent = true;
} else
fosterParent = aboveOnStack(lastTable);
} else { // no table == frag
fosterParent = stack.get(0);
}
if (isLastTableParent) {
Validate.notNull(lastTable); // last table cannot be null by this point.
lastTable.before(in);
}
else
fosterParent.appendChild(in);
}
@Override
public String toString() {
return "TreeBuilder{" +
"currentToken=" + currentToken +
", state=" + state +
", currentElement=" + currentElement() +
'}';
}
}
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