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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Threading;

using Tango.Scripting.Editors.Document;

namespace Tango.Scripting.Editors.Xml
{
	/// <summary>
	/// Creates object tree from XML document.
	/// </summary>
	/// <remarks>
	/// The created tree fully describes the document and thus the orginal XML file can be
	/// exactly reproduced.
	/// 
	/// Any further parses will reparse only the changed parts and the existing tree will
	/// be updated with the changes.  The user can add event handlers to be notified of
	/// the changes.  The
generated by cgit v1.3.1 (git 2.54.0) at 2026-07-14 11:51:15 +0000
g new children) /// /// The object tree consists of following types: /// RawObject - Abstact base class for all types /// RawContainer - Abstact base class for all types that can contain child nodes /// RawDocument - The root object of the XML document /// RawElement - Logical grouping of other nodes together. The first child is always the start tag. /// RawTag - Represents any markup starting with "&lt;" and (hopefully) ending with ">" /// RawAttribute - Name-value pair in a tag /// RawText - Whitespace or character data /// /// For example, see the following XML and the produced object tree: /// <![CDATA[ /// <!-- My favourite quote --> /// <quote author="Albert Einstein"> /// Make everything as simple as possible, but not simpler. /// </quote> /// /// RawDocument /// RawTag "<!--" "-->" /// RawText " My favourite quote " /// RawElement /// RawTag "<" "quote" ">" /// RawText " " /// RawAttribute 'author="Albert Einstein"' /// RawText "\n Make everything as simple as possible, but not simpler.\n" /// RawTag "</" "quote" ">" /// ]]> /// /// The precise content of RawTag depends on what it represents: /// <![CDATA[ /// Start tag: "<" Name? (RawText+ RawAttribute)* RawText* (">" | "/>") /// End tag: "</" Name? (RawText+ RawAttribute)* RawText* ">" /// P.instr.: "<?" Name? (RawText)* "?>" /// Comment: "<!--" (RawText)* "-->" /// CData: "<![CDATA[" (RawText)* "]]" ">" /// DTD: "<!DOCTYPE" (RawText+ RawTag)* RawText* ">" (DOCTYPE or other DTD names) /// UknownBang: "<!" (RawText)* ">" /// ]]> /// /// The type of tag can be identified by the opening backet. /// There are helpper properties in the RawTag class to identify the type, exactly /// one of the properties will be true. /// /// The closing bracket may be missing or may be different for mallformed XML. /// /// Note that there can always be multiple consequtive RawText nodes. /// This is to ensure that idividual texts are not too long. /// /// XML Spec: http://www.w3.org/TR/xml/ /// XML EBNF: http://www.jelks.nu/XML/xmlebnf.html /// /// Internals: /// /// "Try" methods can silently fail by returning false. /// MoveTo methods do not move if they are already at the given target /// If methods return some object, it must be no-empty. It is up to the caller to ensure /// the context is appropriate for reading. /// /// </remarks> public class AXmlParser { AXmlDocument userDocument; internal TrackedSegmentCollection TrackedSegments { get; private set; } /// <summary> /// Generate syntax error when seeing enity reference other then the build-in ones /// </summary> public bool UnknownEntityReferenceIsError { get; set; } /// <summary> Create new parser </summary> public AXmlParser() { this.Lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion); ClearInternal(); } /// <summary> Throws exception if condition is false </summary> internal static void Assert(bool condition, string message) { if (!condition) { throw new InternalException("Assertion failed: " + message); } } /// <summary> Throws exception if condition is false </summary> [Conditional("DEBUG")] internal static void DebugAssert(bool condition, string message) { if (!condition) { throw new InternalException("Assertion failed: " + message); } } [Conditional("DEBUG")] internal static void Log(string text, params object[] pars) { //System.Diagnostics.Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "XML: " + text, pars)); } /// <summary> /// Incrementaly parse the given text. /// You have to hold the write lock. /// </summary> /// <param name="input"> /// The full XML text of the new document. /// </param> /// <param name="changesSinceLastParse"> /// Changes since last parse. Null will cause full reparse. /// </param> public AXmlDocument Parse(string input, IEnumerable<DocumentChangeEventArgs> changesSinceLastParse) { if (!Lock.IsWriteLockHeld) throw new InvalidOperationException("Lock needed!"); // Use changes to invalidate cache if (changesSinceLastParse != null) { this.TrackedSegments.UpdateOffsetsAndInvalidate(changesSinceLastParse); } else { this.TrackedSegments.InvalidateAll(); } TagReader tagReader = new TagReader(this, input); List<AXmlObject> tags = tagReader.ReadAllTags(); AXmlDocument parsedDocument = new TagMatchingHeuristics(this, input, tags).ReadDocument(); tagReader.PrintStringCacheStats(); AXmlParser.Log("Updating main DOM tree..."); userDocument.UpdateTreeFrom(parsedDocument); userDocument.DebugCheckConsistency(true); Assert(userDocument.GetSelfAndAllChildren().Count() == parsedDocument.GetSelfAndAllChildren().Count(), "Parsed document and updated document have different number of children"); return userDocument; } /// <summary> /// Makes calls to Parse() thread-safe. Use Lock everywhere Parse() is called. /// </summary> public ReaderWriterLockSlim Lock { get; private set; } /// <summary> /// Returns the last cached version of the document. /// </summary> /// <exception cref="InvalidOperationException">No read lock is held by the current thread.</exception> public AXmlDocument LastDocument { get { if (!Lock.IsReadLockHeld) throw new InvalidOperationException("Read lock needed!"); return userDocument; } } /// <summary> /// Clears the parser data. /// </summary> /// <exception cref="InvalidOperationException">No write lock is held by the current thread.</exception> public void Clear() { if (!Lock.IsWriteLockHeld) throw new InvalidOperationException("Write lock needed!"); ClearInternal(); } void ClearInternal() { this.UnknownEntityReferenceIsError = true; this.TrackedSegments = new TrackedSegmentCollection(); this.userDocument = new AXmlDocument() { Parser = this }; this.userDocument.Document = this.userDocument; // Track the document this.TrackedSegments.AddParsedObject(this.userDocument, null); this.userDocument.IsCached = false; } } }