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// Jericho HTML Parser - Java based library for analysing and manipulating HTML
// Version 3.2
// Copyright (C) 2004-2009 Martin Jericho
// http://jericho.htmlparser.net/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of either one of the following licences:
//
// 1. The Eclipse Public License (EPL) version 1.0,
// included in this distribution in the file licence-epl-1.0.html
// or available at http://www.eclipse.org/legal/epl-v10.html
//
// 2. The GNU Lesser General Public License (LGPL) version 2.1 or later,
// included in this distribution in the file licence-lgpl-2.1.txt
// or available at http://www.gnu.org/licenses/lgpl.txt
//
// This library is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the individual licence texts for more details.
package net.htmlparser.jericho;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.io.Closeable;
import java.io.Reader;
import java.io.Writer;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.CharBuffer;
import java.nio.BufferOverflowException;
import java.net.URL;
import java.net.URLConnection;
/**
* Represents a streamed source HTML document.
*
* This class provides a means, via the {@link #iterator()} method, of sequentially parsing every {@linkplain Tag tag}, {@linkplain CharacterReference character reference}
* and plain text segment contained within the source document using a minimum amount of memory.
*
* In contrast, the standard {@link Source} class stores the entire source text in memory and caches every tag parsed,
* resulting in memory problems when attempting to parse very large files.
*
* The {@link #iterator() iterator} parses and returns each segment as the source text is streamed in.
* Previous segments are discarded for garbage collection.
* Source documents up to 2GB in size can be processed, a limit which is imposed by the java language because of its use of the int data type to index string operations.
*
* There is however a significant trade-off in functionality when using the StreamedSource class as opposed to the {@link Source} class.
* The {@link Tag#getElement()} method is not supported on tags that are returned by the iterator, nor are any methods that use the {@link Element} class in any way.
* The {@link Segment#getSource()} method is also not supported.
*
* Most of the methods and constructors in this class mirror similarly named methods in the {@link Source} class where the same functionality is available.
*
* See the description of the {@link #iterator()} method for a typical usage example of this class.
*
* In contrast to a {@link Source} object, the Reader or InputStream specified in the constructor or created implicitly by the constructor
* remains open for the life of the StreamedSource object. If the stream is created internally, it is automatically {@linkplain #close() closed}
* when the end of the stream is reached or the StreamedSource object is {@linkplain #finalize() finalized}.
* However a Reader or InputStream that is specified directly in a constructor is never closed automatically, as it can not be assumed
* that the application has no further use for it. It is the user's responsibility to ensure it is closed in this case.
* Explicitly calling the {@link #close()} method on the StreamedSource object ensures that all resources used by it are closed, regardless of whether
* they were created internally or supplied externally.
*
* The functionality provided by StreamedSource is similar to a StAX parser,
* but with some important benefits:
*
* -
* The source document does not have to be valid XML. It can be plain HTML, can contain invalid syntax, undefined entities,
* incorrectly nested elements, {@linkplain TagType#isServerTag() server tags}, or anything else that is commonly found in
* "tag soup".
*
-
* Every single syntactical construct in the source document's original text is included in the iterator, including the
* {@linkplain StartTagType#XML_DECLARATION XML declaration}, {@linkplain CharacterReference character references}, {@linkplain StartTagType#COMMENT comments},
* {@linkplain StartTagType#CDATA_SECTION CDATA sections} and {@linkplain TagType#isServerTag() server tags},
* each providing the segment's {@linkplain Segment#getBegin() begin} and {@linkplain Segment#getEnd() end} position in the source document.
* This allows an exact copy of the original document to be generated, allowing modifications to be made only where they are explicitly required.
* This is not possible with either SAX or
* StAX, which to some extent provide interpretations of the content of the XML
* instead of the syntactial structures used in the original source document.
*
*
* The following table summarises the differences between the StreamedSource, StAX and SAX interfaces.
* Note that some of the available features are documented as optional and may not be supported by all implementations of StAX and SAX.
*
*
*
* Feature StreamedSourceStAX SAX Parse XML ● ● ● Parse entities without DTD ● Automatically validate XML ● ● Parse HTML ● Tolerant of syntax or nesting errors ● Provide begin and end character positions of each event1 ● ○ Provide source text of each event ● Handle {@linkplain TagType#isServerTag() server tag} events ● Handle {@linkplain StartTagType#XML_DECLARATION XML declaration} event ● Handle {@linkplain StartTagType#COMMENT comment} events ● ● ● Handle {@linkplain StartTagType#CDATA_SECTION CDATA section} events ● ● ● Handle {@linkplain StartTagType#DOCTYPE_DECLARATION document type declaration} event ● ● ● Handle {@linkplain CharacterReference character reference} events ● Allow chunking of plain text ● ● ● Allow chunking of comment text Allow chunking of CDATA section text ● Allow specification of maximum buffer size ●
* 1 StAX optionally reports the "offset" of each event but this could be either byte or character position depending on the source.
*
* Note that the {@link OutputDocument} class can not be used to create a modified version of a streamed source document.
* Instead, the output document must be constructed manually from the segments provided by the {@link #iterator() iterator}.
*
* StreamedSource objects are not thread safe.
*/
public final class StreamedSource implements Iterable, Closeable {
private final StreamedText streamedText;
private final StreamedParseText streamedParseText;
private final Source source;
private final Closeable closeable; // internally created closeable object should be cleaned up internally.
private final boolean automaticClose;
private boolean coalescing=false;
private boolean handleTags=true;
private Config.UnterminatedCharacterReferenceSettings unterminatedCharacterReferenceSettings=Config.CurrentCompatibilityMode.getUnterminatedCharacterReferenceSettings(false);
private boolean isInitialised=false;
private Segment currentSegment=null;
private Segment nextParsedSegment=START_SEGMENT;
private boolean isXML;
private static final boolean assumeNoNestedTags=false;
private static final Segment START_SEGMENT=new Segment(-1,-1);
private StreamedSource(final Reader reader, final boolean automaticClose, final String encoding, final String encodingSpecificationInfo, final String preliminaryEncodingInfo) throws IOException {
closeable=reader;
this.automaticClose=automaticClose;
streamedText=new StreamedText(reader);
streamedParseText=new StreamedParseText(streamedText);
source=new Source(streamedText,streamedParseText,encoding,encodingSpecificationInfo,preliminaryEncodingInfo);
}
private StreamedSource(final EncodingDetector encodingDetector, final boolean automaticClose) throws IOException {
this(encodingDetector.openReader(),automaticClose,encodingDetector.getEncoding(),encodingDetector.getEncodingSpecificationInfo(),encodingDetector.getPreliminaryEncoding()+": "+encodingDetector.getPreliminaryEncodingSpecificationInfo());
}
/**
* Constructs a new StreamedSource object by loading the content from the specified Reader.
*
* If the specified reader is an instance of InputStreamReader, the {@link #getEncoding()} method of the
* created StreamedSource object returns the encoding from InputStreamReader.getEncoding().
*
* @param reader the java.io.Reader from which to load the source text.
* @throws java.io.IOException if an I/O error occurs.
*/
public StreamedSource(final Reader reader) throws IOException {
this(reader,false,(reader instanceof InputStreamReader) ? ((InputStreamReader)reader).getEncoding() : null,(reader instanceof InputStreamReader) ? "InputStreamReader.getEncoding() of constructor argument" : null,null);
}
/**
* Constructs a new StreamedSource object by loading the content from the specified InputStream.
*
* The algorithm for detecting the character {@linkplain #getEncoding() encoding} of the source document from the raw bytes
* of the specified input stream is the same as that for the {@link Source#Source(URLConnection) Source(URLConnection)} constructor of the {@link Source} class,
* except that the first step is not possible as there is no
* Content-Type header to check.
*
* If the specified InputStream does not support the mark method, the algorithm that determines the encoding may have to wrap it
* in a BufferedInputStream in order to look ahead at the encoding meta data.
* This extra layer of buffering will then remain in place for the life of the StreamedSource, possibly impacting memory usage and/or degrading performance.
* It is always preferable to use the {@link #StreamedSource(Reader)} constructor if the encoding is known in advance.
*
* @param inputStream the java.io.InputStream from which to load the source text.
* @throws java.io.IOException if an I/O error occurs.
* @see #getEncoding()
*/
public StreamedSource(final InputStream inputStream) throws IOException {
this(new EncodingDetector(inputStream),false);
}
/**
* Constructs a new StreamedSource object by loading the content from the specified URL.
*
* This is equivalent to {@link #StreamedSource(URLConnection) StreamedSource(url.openConnection())}.
*
* @param url the URL from which to load the source text.
* @throws java.io.IOException if an I/O error occurs.
* @see #getEncoding()
*/
public StreamedSource(final URL url) throws IOException {
this(new EncodingDetector(url.openConnection()),true);
}
/**
* Constructs a new StreamedSource object by loading the content from the specified URLConnection.
*
* The algorithm for detecting the character {@linkplain #getEncoding() encoding} of the source document is identical to that described in the
* {@link Source#Source(URLConnection) Source(URLConnection)} constructor of the {@link Source} class.
*
* The algorithm that determines the encoding may have to wrap the input stream in a BufferedInputStream in order to look ahead
* at the encoding meta data if the encoding is not specified in the HTTP headers.
* This extra layer of buffering will then remain in place for the life of the StreamedSource, possibly impacting memory usage and/or degrading performance.
* It is always preferable to use the {@link #StreamedSource(Reader)} constructor if the encoding is known in advance.
*
* @param urlConnection the URL connection from which to load the source text.
* @throws java.io.IOException if an I/O error occurs.
* @see #getEncoding()
*/
public StreamedSource(final URLConnection urlConnection) throws IOException {
this(new EncodingDetector(urlConnection),true);
}
/**
* Constructs a new StreamedSource object from the specified text.
*
* Although the CharSequence argument of this constructor apparently contradicts the notion of streaming in the source text,
* it can still benefits over the equivalent use of the standard {@link Source} class.
*
* Firstly, using the StreamedSource class to iterate the nodes of an in-memory CharSequence source document still requires much less memory
* than the equivalent operation using the standard {@link Source} class.
*
* Secondly, the specified CharSequence object could possibly implement its own paging mechanism to minimise memory usage.
*
* If the specified CharSequence is mutable, its state must not be modified while the StreamedSource is in use.
*
* @param text the source text.
*/
public StreamedSource(final CharSequence text) {
closeable=null;
automaticClose=false;
streamedText=new StreamedText(text);
streamedParseText=new StreamedParseText(streamedText);
source=new Source(text,streamedParseText,null,"Document specified encoding can not be determined automatically from a streamed source",null);
}
/**
* Specifies an existing character array to use for buffering the incoming character stream.
*
* The specified buffer is fixed for the life of the StreamedSource object, in contrast to the default buffer which can be automatically replaced
* by a larger buffer as needed.
* This means that if a {@linkplain Tag tag} (including a {@linkplain StartTagType#COMMENT comment} or {@linkplain StartTagType#CDATA_SECTION CDATA section}) is
* encountered that is larger than the specified buffer, an unrecoverable BufferOverflowException is thrown.
* This exception is also thrown if {@link #setCoalescing(boolean) coalescing} has been enabled and a plain text segment is encountered
* that is larger than the specified buffer.
*
* In general this method should only be used if there needs to be an absolute maximum memory limit imposed on the parser, where that requirement is more important
* than the ability to parse any source document successfully.
*
* This method can only be called before the {@link #iterator()} method has been called.
*
* @param buffer an existing character array to use for buffering the incoming character stream, must not be null.
* @return this StreamedSource instance, allowing multiple property setting methods to be chained in a single statement.
* @throws IllegalStateException if the {@link #iterator()} method has already been called.
*/
public StreamedSource setBuffer(char[] buffer) {
if (isInitialised) throw new IllegalStateException("setBuffer() can only be called before iterator() is called");
streamedText.setBuffer(buffer);
return this;
}
/**
* Specifies whether an unbroken section of plain text in the source document should always be coalesced into a single {@link Segment} by the {@linkplain #iterator() iterator}.
*
* If this property is set to the default value of false,
* and a section of plain text is encountered in the document that is larger than the current {@linkplain #getBufferSize() buffer size},
* the text is chunked into multiple consecutive plain text segments in order to minimise memory usage.
*
* If this property is set to true then chunking is disabled, ensuring that consecutive plain text segments are never generated,
* but instead forcing the internal buffer to expand to fit the largest section of plain text.
*
* Note that {@link CharacterReference} segments are always handled separately from plain text, regardless of the value of this property.
* For this reason, algorithms that process element content almost always have to be designed to expect the text in multiple segments
* in order to handle character references, so there is usually no advantage in {@linkplain #setCoalescing(boolean) coalescing} plain text segments.
*
* @param coalescing the new value of the coalescing property.
* @return this StreamedSource instance, allowing multiple property setting methods to be chained in a single statement.
* @throws IllegalStateException if the {@link #iterator()} method has already been called.
*/
public StreamedSource setCoalescing(final boolean coalescing) {
if (isInitialised) throw new IllegalStateException("setPlainTextWriter() can only be called before iterator() is called");
this.coalescing=coalescing;
return this;
}
/**
* Closes the underlying Reader or InputStream and releases any system resources associated with it.
*
* If the stream is already closed then invoking this method has no effect.
*
* @throws IOException if an I/O error occurs.
*/
public void close() throws IOException {
if (closeable!=null) closeable.close();
}
/**
* Returns the character encoding scheme of the source byte stream used to create this object.
*
* This method works in essentially the same way as the {@link Source#getEncoding()} method.
*
* If the byte stream used to create this object does not support the mark method, the algorithm that determines the encoding may have to wrap it
* in a BufferedInputStream in order to look ahead at the encoding meta data.
* This extra layer of buffering will then remain in place for the life of the StreamedSource, possibly impacting memory usage and/or degrading performance.
* It is always preferable to use the {@link #StreamedSource(Reader)} constructor if the encoding is known in advance.
*
* The {@link #getEncodingSpecificationInfo()} method returns a simple description of how the value of this method was determined.
*
* @return the character encoding scheme of the source byte stream used to create this object, or null if the encoding is not known.
* @see #getEncodingSpecificationInfo()
*/
public String getEncoding() {
return source.getEncoding();
}
/**
* Returns a concise description of how the {@linkplain #getEncoding() encoding} of the source document was determined.
*
* The description is intended for informational purposes only.
* It is not guaranteed to have any particular format and can not be reliably parsed.
*
* @return a concise description of how the {@linkplain #getEncoding() encoding} of the source document was determined.
* @see #getEncoding()
*/
public String getEncodingSpecificationInfo() {
return source.getEncodingSpecificationInfo();
}
/**
* Returns the preliminary encoding of the source document together with a concise description of how it was determined.
*
* This method works in essentially the same way as the {@link Source#getPreliminaryEncodingInfo()} method.
*
* The description returned by this method is intended for informational purposes only.
* It is not guaranteed to have any particular format and can not be reliably parsed.
*
* @return the preliminary encoding of the source document together with a concise description of how it was determined, or null if no preliminary encoding was required.
* @see #getEncoding()
*/
public String getPreliminaryEncodingInfo() {
return source.getPreliminaryEncodingInfo();
}
/**
* Returns an iterator over every {@linkplain Tag tag}, {@linkplain CharacterReference character reference} and plain text segment contained within the source document.
*
* Plain text is defined as all text that is not part of a {@link Tag} or {@link CharacterReference}.
*
* This results in a sequential walk-through of the entire source document.
* The {@linkplain Segment#getEnd() end} position of each segment should correspond with the {@linkplain Segment#getBegin() begin} position of the subsequent segment,
* unless any of the tags are enclosed by other tags.
* This could happen if there are {@linkplain TagType#isServerTag() server tags} present in the document, or in rare circumstances where the
* {@linkplain StartTagType#DOCTYPE_DECLARATION document type declaration} contains {@linkplain StartTagType#MARKUP_DECLARATION markup declarations}.
*
* Each segment generated by the iterator is parsed as the source text is streamed in. Previous segments are discarded for garbage collection.
*
* If a section of plain text is encountered in the document that is larger than the current {@linkplain #getBufferSize() buffer size},
* the text is chunked into multiple consecutive plain text segments in order to minimise memory usage.
* Setting the {@link #setCoalescing(boolean) Coalescing} property to true disables chunking, ensuring that consecutive plain text segments are never generated,
* but instead forcing the internal buffer to expand to fit the largest section of plain text.
* Note that {@link CharacterReference} segments are always handled separately from plain text, regardless of whether {@linkplain #setCoalescing(boolean) coalescing}
* is enabled. For this reason, algorithms that process element content almost always have to be designed to expect the text in multiple segments
* in order to handle character references, so there is usually no advantage in {@linkplain #setCoalescing(boolean) coalescing} plain text segments.
*
* Character references that are found inside tags, such as those present inside attribute values, do not generate separate segments from the iterator.
*
* This method may only be called once on any particular StreamedSource instance.
*
*
* - Example:
* -
*
* The following code demonstrates the typical (implied) usage of this method through the Iterable interface
* to make an exact copy of the document from reader to writer (assuming no server tags are present):
*
*
* StreamedSource streamedSource=new StreamedSource(reader);
* for (Segment segment : streamedSource) {
* if (segment instanceof Tag) {
* Tag tag=(Tag)segment;
* // HANDLE TAG
* // Uncomment the following line to ensure each tag is valid XML:
* // writer.write(tag.tidy()); continue;
* } else if (segment instanceof CharacterReference) {
* CharacterReference characterReference=(CharacterReference)segment;
* // HANDLE CHARACTER REFERENCE
* // Uncomment the following line to decode all character references instead of copying them verbatim:
* // characterReference.appendCharTo(writer); continue;
* } else {
* // HANDLE PLAIN TEXT
* }
* // unless specific handling has prevented getting to here, simply output the segment as is:
* writer.write(segment.toString());
* }
* Note that the last line writer.write(segment.toString()) in the above code can be replaced with the following for improved performance:
*
* CharBuffer charBuffer=streamedSource.getCurrentSegmentCharBuffer();
* writer.write(charBuffer.array(),charBuffer.position(),charBuffer.length());
*
* -
*
* The following code demonstrates how to process the plain text content of a specific element, in this case to print the content of every paragraph element:
*
*
* StreamedSource streamedSource=new StreamedSource(reader);
* StringBuilder sb=new StringBuilder();
* boolean insideParagraphElement=false;
* for (Segment segment : streamedSource) {
* if (segment instanceof Tag) {
* Tag tag=(Tag)segment;
* if (tag.getName().equals("p")) {
* if (tag instanceof StartTag) {
* insideParagraphElement=true;
* sb.setLength(0);
* } else { // tag instanceof EndTag
* insideParagraphElement=false;
* System.out.println(sb.toString());
* }
* }
* } else if (insideParagraphElement) {
* if (segment instanceof CharacterReference) {
* ((CharacterReference)segment).appendCharTo(sb);
* } else {
* sb.append(segment);
* }
* }
* }
*
*
* @return an iterator over every {@linkplain Tag tag}, {@linkplain CharacterReference character reference} and plain text segment contained within the source document.
*/
public Iterator iterator() {
if (isInitialised) throw new IllegalStateException("iterator() can only be called once");
isInitialised=true;
return new StreamedSourceIterator();
}
/**
* Returns the current {@link Segment} from the {@linkplain #iterator()}.
*
* This is defined as the last {@link Segment} returned from the iterator's next() method.
*
* This method returns null if the iterator's next() method has never been called, or its
* hasNext() method has returned the value false.
*
* @return the current {@link Segment} from the {@linkplain #iterator()}.
*/
public Segment getCurrentSegment() {
return currentSegment;
}
/**
* Returns a CharBuffer containing the source text of the {@linkplain #getCurrentSegment() current segment}.
*
* The returned CharBuffer provides a window into the internal char[] buffer including the position and length that spans the
* {@linkplain #getCurrentSegment() current segment}.
*
* For example, the following code writes the source text of the current segment to writer:
*
* CharBuffer charBuffer=streamedSource.getCurrentSegmentCharBuffer();
* writer.write(charBuffer.array(),charBuffer.position(),charBuffer.length());
*
* This may provide a performance benefit over the standard way of accessing the source text of the current segment,
* which is to use the CharSequence interface of the segment directly, or to call {@link Segment#toString()}.
*
* Because this CharBuffer is a direct window into the internal buffer of the StreamedSource, the contents of the
* CharBuffer.array() must not be modified, and the array is only guaranteed to hold the segment source text until the
* iterator's hasNext() or next() method is next called.
*
* @return a CharBuffer containing the source text of the {@linkplain #getCurrentSegment() current segment}.
*/
public CharBuffer getCurrentSegmentCharBuffer() {
return streamedText.getCharBuffer(currentSegment.getBegin(),currentSegment.end);
}
/**
* Indicates whether the source document is likely to be XML.
*
* The algorithm used to determine this is designed to be relatively inexpensive and to provide an accurate result in
* most normal situations.
* An exact determination of whether the source document is XML would require a much more complex analysis of the text.
*
* The algorithm is as follows:
*
* - If the document begins with an {@linkplain StartTagType#XML_DECLARATION XML declaration}, it is an XML document.
*
- If the document begins with a {@linkplain StartTagType#DOCTYPE_DECLARATION document type declaration} that contains the text
* "
xhtml", it is an XHTML document, and hence
* also an XML document.
* - If none of the above conditions are met, assume the document is normal HTML, and therefore not an XML document.
*
*
* This method can only be called after the {@link #iterator()} method has been called.
*
* @return true if the source document is likely to be XML, otherwise false.
* @throws IllegalStateException if the {@link #iterator()} method has not yet been called.
*/
public boolean isXML() {
if (!isInitialised) throw new IllegalStateException("isXML() method only available after iterator() has been called");
return isXML;
}
/**
* Sets the {@link Logger} that handles log messages.
*
* Specifying a null argument disables logging completely for operations performed on this StreamedSource object.
*
* A logger instance is created automatically for each StreamedSource object in the same way as is described in the
* {@link Source#setLogger(Logger)} method.
*
* @param logger the logger that will handle log messages, or null to disable logging.
* @see Config#LoggerProvider
*/
public void setLogger(final Logger logger) {
source.setLogger(logger);
}
/**
* Returns the {@link Logger} that handles log messages.
*
* A logger instance is created automatically for each StreamedSource object using the {@link LoggerProvider}
* specified by the static {@link Config#LoggerProvider} property.
* This can be overridden by calling the {@link #setLogger(Logger)} method.
* The name used for all automatically created logger instances is "net.htmlparser.jericho".
*
* @return the {@link Logger} that handles log messages, or null if logging is disabled.
*/
public Logger getLogger() {
return source.getLogger();
}
/**
* Returns the current size of the internal character buffer.
*
* This information is generally useful only for investigating memory and performance issues.
*
* @return the current size of the internal character buffer.
*/
public int getBufferSize() {
return streamedText.getBuffer().length;
}
/**
* Returns a string representation of the object as generated by the default Object.toString() implementation.
*
* In contrast to the {@link Source#toString()} implementation, it is generally not possible for this method to return the entire source text.
*
* @return a string representation of the object as generated by the default Object.toString() implementation.
*/
public String toString() {
return super.toString();
}
/**
* Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
*
* This implementation calls the {@link #close()} method if the underlying Reader or InputStream stream was created internally.
*/
protected void finalize() {
automaticClose();
}
StreamedSource setHandleTags(final boolean handleTags) {
this.handleTags=handleTags;
return this;
}
StreamedSource setUnterminatedCharacterReferenceSettings(final Config.UnterminatedCharacterReferenceSettings unterminatedCharacterReferenceSettings) {
this.unterminatedCharacterReferenceSettings=unterminatedCharacterReferenceSettings;
return this;
}
StreamedSource setSearchBegin(final int begin) {
if (isInitialised) throw new IllegalStateException("setSearchBegin() can only be called before iterator() is called");
final int segmentEnd=begin-1;
nextParsedSegment=new Segment(segmentEnd,segmentEnd);
return this;
}
private void automaticClose() {
if (automaticClose) try {close();} catch (IOException ex) {}
}
private static boolean isXML(final Segment firstNonTextSegment) {
if (firstNonTextSegment==null || !(firstNonTextSegment instanceof Tag)) return false;
Tag tag=(Tag)firstNonTextSegment;
if (tag.getTagType()==StartTagType.XML_DECLARATION) return true;
// if document has a DOCTYPE declaration and it contains the text "xhtml", it is an XML document:
if (tag.source.getParseText().indexOf("xhtml",tag.begin,tag.end)!=-1) return true;
return false;
}
private class StreamedSourceIterator implements Iterator {
private final boolean coalescing;
private final boolean handleTags;
private Config.UnterminatedCharacterReferenceSettings unterminatedCharacterReferenceSettings;
private Segment nextSegment;
private int plainTextSegmentBegin=0;
private final char[] charByRef=new char[1]; // used to pass a single character by reference
public StreamedSourceIterator() {
coalescing=StreamedSource.this.coalescing;
handleTags=StreamedSource.this.handleTags;
unterminatedCharacterReferenceSettings=StreamedSource.this.unterminatedCharacterReferenceSettings;
loadNextParsedSegment();
isXML=isXML(nextParsedSegment);
}
public boolean hasNext() {
if (nextSegment==Tag.NOT_CACHED) loadNextParsedSegment();
return nextSegment!=null;
}
public Segment next() {
if (!hasNext()) throw new NoSuchElementException();
final Segment result=nextSegment;
nextSegment=(result==nextParsedSegment) ? Tag.NOT_CACHED : nextParsedSegment;
streamedText.setMinRequiredBufferBegin(result.end); // guaranteed not to be discarded until next call to loadNextParsedSegment()
currentSegment=result;
return result;
}
public void remove() {
throw new UnsupportedOperationException();
}
private final void loadNextParsedSegment() {
nextParsedSegment=findNextParsedSegment();
final int plainTextSegmentEnd=(nextParsedSegment!=null) ? nextParsedSegment.begin : streamedText.length();
nextSegment=(plainTextSegmentBegin=source.fullSequentialParseData[0]) { // do not handle character references inside tags or script elements
final CharacterReference characterReference=CharacterReference.construct(source,i,unterminatedCharacterReferenceSettings);
if (characterReference!=null) return characterReference;
}
} else if (handleTags && ch=='<') {
final Tag tag=TagType.getTagAt(source,i,false,assumeNoNestedTags);
if (tag!=null && !tag.isUnregistered()) {
final TagType tagType=tag.getTagType();
if (tag.end>source.fullSequentialParseData[0] && tagType!=StartTagType.DOCTYPE_DECLARATION) {
source.fullSequentialParseData[0]=(tagType==StartTagType.NORMAL && tag.name==HTMLElementName.SCRIPT && !((StartTag)tag).isEmptyElementTag()) ? Integer.MAX_VALUE : tag.end;
}
return tag;
}
}
i++;
}
if (i