675 lines
16 KiB
C#
675 lines
16 KiB
C#
//
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// System.Web.Compilation.AspParser
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//
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// Authors:
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// Gonzalo Paniagua Javier (gonzalo@ximian.com)
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// Marek Habersack <mhabersack@novell.com>
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//
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// (C) 2002,2003 Ximian, Inc (http://www.ximian.com)
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// (C) 2004-2009 Novell, Inc (http://novell.com)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel;
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using System.Collections;
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using System.Globalization;
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using System.IO;
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using System.Text;
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using System.Web.Util;
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using System.Security.Cryptography;
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namespace System.Web.Compilation
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{
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delegate void ParseErrorHandler (ILocation location, string message);
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delegate void TextParsedHandler (ILocation location, string text);
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delegate void TagParsedHandler (ILocation location, TagType tagtype, string id, TagAttributes attributes);
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delegate void ParsingCompleteHandler ();
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class AspParser : ILocation
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{
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static readonly object errorEvent = new object ();
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static readonly object tagParsedEvent = new object ();
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static readonly object textParsedEvent = new object ();
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static readonly object parsingCompleteEvent = new object();
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MD5 checksum;
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AspTokenizer tokenizer;
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int beginLine, endLine;
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int beginColumn, endColumn;
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int beginPosition, endPosition;
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string filename;
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string verbatimID;
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string fileText;
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StringReader fileReader;
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bool _internal;
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int _internalLineOffset;
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int _internalPositionOffset;
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AspParser outer;
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EventHandlerList events = new EventHandlerList ();
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public event ParseErrorHandler Error {
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add { events.AddHandler (errorEvent, value); }
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remove { events.RemoveHandler (errorEvent, value); }
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}
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public event TagParsedHandler TagParsed {
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add { events.AddHandler (tagParsedEvent, value); }
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remove { events.RemoveHandler (tagParsedEvent, value); }
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}
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public event TextParsedHandler TextParsed {
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add { events.AddHandler (textParsedEvent, value); }
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remove { events.RemoveHandler (textParsedEvent, value); }
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}
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public event ParsingCompleteHandler ParsingComplete {
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add { events.AddHandler (parsingCompleteEvent, value); }
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remove { events.RemoveHandler (parsingCompleteEvent, value); }
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}
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public AspParser (string filename, TextReader input)
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{
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this.filename = filename;
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this.fileText = input.ReadToEnd ();
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this.fileReader = new StringReader (this.fileText);
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this._internalLineOffset = 0;
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tokenizer = new AspTokenizer (this.fileReader);
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}
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public AspParser (string filename, TextReader input, int startLineOffset, int positionOffset, AspParser outer)
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: this (filename, input)
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{
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this._internal = true;
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this._internalLineOffset = startLineOffset;
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this._internalPositionOffset = positionOffset;
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this.outer = outer;
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}
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public byte[] MD5Checksum {
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get {
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if (checksum == null)
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return new byte[0];
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return checksum.Hash;
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}
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}
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public int BeginPosition {
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get { return beginPosition; }
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}
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public int EndPosition {
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get { return endPosition; }
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}
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public int BeginLine {
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get {
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if (_internal)
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return beginLine + _internalLineOffset;
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return beginLine;
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}
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}
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public int BeginColumn {
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get { return beginColumn; }
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}
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public int EndLine {
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get {
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if (_internal)
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return endLine + _internalLineOffset;
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return endLine;
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}
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}
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public int EndColumn {
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get { return endColumn; }
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}
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public string FileText {
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get {
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string ret = null;
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if (_internal && outer != null)
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ret = outer.FileText;
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if (ret == null && fileText != null)
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ret = fileText;
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return ret;
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}
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}
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public string PlainText {
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get {
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if (beginPosition >= endPosition || fileText == null)
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return null;
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string text = FileText;
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int start, len;
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if (_internal && outer != null) {
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start = beginPosition + _internalPositionOffset;
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len = (endPosition + _internalPositionOffset) - start;
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} else {
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start = beginPosition;
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len = endPosition - beginPosition;
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}
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if (text != null)
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return text.Substring (start, len);
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return null;
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}
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}
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public string Filename {
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get {
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if (_internal && outer != null)
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return outer.Filename;
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return filename;
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}
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}
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public string VerbatimID {
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set {
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tokenizer.Verbatim = true;
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verbatimID = value;
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}
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}
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bool Eat (int expected_token)
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{
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int token = tokenizer.get_token ();
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if (token != expected_token) {
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tokenizer.put_back ();
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return false;
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}
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endLine = tokenizer.EndLine;
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endColumn = tokenizer.EndColumn;
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return true;
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}
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void BeginElement ()
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{
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beginLine = tokenizer.BeginLine;
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beginColumn = tokenizer.BeginColumn;
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beginPosition = tokenizer.Position - 1;
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}
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void EndElement ()
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{
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endLine = tokenizer.EndLine;
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endColumn = tokenizer.EndColumn;
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endPosition = tokenizer.Position;
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}
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public void Parse ()
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{
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if (tokenizer == null) {
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OnError ("AspParser not initialized properly.");
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return;
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}
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int token;
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string id;
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TagAttributes attributes;
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TagType tagtype = TagType.Text;
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StringBuilder text = new StringBuilder ();
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try {
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while ((token = tokenizer.get_token ()) != Token.EOF) {
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BeginElement ();
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if (tokenizer.Verbatim){
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string end_verbatim = "</" + verbatimID + ">";
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string verbatim_text = GetVerbatim (token, end_verbatim);
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if (verbatim_text == null)
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OnError ("Unexpected EOF processing " + verbatimID);
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tokenizer.Verbatim = false;
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EndElement ();
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endPosition -= end_verbatim.Length;
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OnTextParsed (verbatim_text);
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beginPosition = endPosition;
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endPosition += end_verbatim.Length;
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OnTagParsed (TagType.Close, verbatimID, null);
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continue;
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}
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if (token == '<') {
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GetTag (out tagtype, out id, out attributes);
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EndElement ();
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if (tagtype == TagType.ServerComment)
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continue;
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if (tagtype == TagType.Text)
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OnTextParsed (id);
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else
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OnTagParsed (tagtype, id, attributes);
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continue;
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}
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if (tokenizer.Value.Trim ().Length == 0 && tagtype == TagType.Directive) {
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continue;
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}
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text.Length = 0;
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do {
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text.Append (tokenizer.Value);
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token = tokenizer.get_token ();
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} while (token != '<' && token != Token.EOF);
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tokenizer.put_back ();
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EndElement ();
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OnTextParsed (text.ToString ());
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}
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} finally {
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if (fileReader != null) {
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fileReader.Close ();
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fileReader = null;
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}
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checksum = tokenizer.Checksum;
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tokenizer = null;
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}
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OnParsingComplete ();
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}
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bool GetInclude (string str, out string pathType, out string filename)
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{
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pathType = null;
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filename = null;
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str = str.Substring (2).Trim ();
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int len = str.Length;
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int lastQuote = str.LastIndexOf ('"');
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if (len < 10 || lastQuote != len - 1)
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return false;
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if (!StrUtils.StartsWith (str, "#include ", true))
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return false;
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str = str.Substring (9).Trim ();
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bool isfile = (StrUtils.StartsWith (str ,"file", true));
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if (!isfile && !StrUtils.StartsWith (str, "virtual", true))
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return false;
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pathType = (isfile) ? "file" : "virtual";
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if (str.Length < pathType.Length + 3)
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return false;
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str = str.Substring (pathType.Length).Trim ();
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if (str.Length < 3 || str [0] != '=')
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return false;
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int index = 1;
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for (; index < str.Length; index++) {
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if (Char.IsWhiteSpace (str [index]))
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continue;
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else if (str [index] == '"')
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break;
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}
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if (index == str.Length || index == lastQuote)
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return false;
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str = str.Substring (index);
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if (str.Length == 2) { // only quotes
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OnError ("Empty file name.");
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return false;
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}
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filename = str.Trim ().Substring (index, str.Length - 2);
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if (filename.LastIndexOf ('"') != -1)
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return false; // file=""" -> no error
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return true;
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}
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void GetTag (out TagType tagtype, out string id, out TagAttributes attributes)
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{
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int token = tokenizer.get_token ();
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tagtype = TagType.ServerComment;
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id = null;
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attributes = null;
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switch (token){
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case '%':
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GetServerTag (out tagtype, out id, out attributes);
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break;
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case '/':
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if (!Eat (Token.IDENTIFIER))
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OnError ("expecting TAGNAME");
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id = tokenizer.Value;
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if (!Eat ('>'))
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OnError ("expecting '>'. Got '" + id + "'");
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tagtype = TagType.Close;
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break;
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case '!':
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bool double_dash = Eat (Token.DOUBLEDASH);
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if (double_dash)
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tokenizer.put_back ();
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tokenizer.Verbatim = true;
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string end = double_dash ? "-->" : ">";
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string comment = GetVerbatim (tokenizer.get_token (), end);
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tokenizer.Verbatim = false;
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if (comment == null)
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OnError ("Unfinished HTML comment/DTD");
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string pathType, filename;
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if (double_dash && GetInclude (comment, out pathType, out filename)) {
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tagtype = TagType.Include;
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attributes = new TagAttributes ();
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attributes.Add (pathType, filename);
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} else {
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tagtype = TagType.Text;
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id = "<!" + comment + end;
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}
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break;
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case Token.IDENTIFIER:
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if (this.filename == "@@inner_string@@") {
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// Actually not tag but "xxx < yyy" stuff in inner_string!
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tagtype = TagType.Text;
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tokenizer.InTag = false;
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id = "<" + tokenizer.Odds + tokenizer.Value;
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} else {
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id = tokenizer.Value;
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try {
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attributes = GetAttributes ();
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} catch (Exception e) {
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OnError (e.Message);
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break;
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}
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tagtype = TagType.Tag;
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if (Eat ('/') && Eat ('>')) {
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tagtype = TagType.SelfClosing;
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} else if (!Eat ('>')) {
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if (attributes.IsRunAtServer ()) {
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OnError ("The server tag is not well formed.");
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break;
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}
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tokenizer.Verbatim = true;
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attributes.Add (String.Empty, GetVerbatim (tokenizer.get_token (), ">") + ">");
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tokenizer.Verbatim = false;
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}
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}
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break;
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default:
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string idvalue = null;
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// This is to handle code like:
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//
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// <asp:ListItem runat="server"> < </asp:ListItem>
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//
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if ((char)token == '<') {
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string odds = tokenizer.Odds;
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if (odds != null && odds.Length > 0 && Char.IsWhiteSpace (odds [0])) {
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tokenizer.put_back ();
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idvalue = odds;
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} else
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idvalue = tokenizer.Value;
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} else
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idvalue = tokenizer.Value;
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tagtype = TagType.Text;
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tokenizer.InTag = false;
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id = "<" + idvalue;
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break;
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}
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}
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TagAttributes GetAttributes ()
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{
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int token;
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TagAttributes attributes;
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string id;
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bool wellFormedForServer = true;
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attributes = new TagAttributes ();
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while ((token = tokenizer.get_token ()) != Token.EOF){
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if (token == '<' && Eat ('%')) {
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tokenizer.Verbatim = true;
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attributes.Add (String.Empty, "<%" +
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GetVerbatim (tokenizer.get_token (), "%>") + "%>");
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tokenizer.Verbatim = false;
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tokenizer.InTag = true;
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continue;
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}
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if (token != Token.IDENTIFIER)
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break;
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id = tokenizer.Value;
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if (Eat ('=')){
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if (Eat (Token.ATTVALUE)){
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attributes.Add (id, tokenizer.Value);
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wellFormedForServer &= tokenizer.AlternatingQuotes;
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} else if (Eat ('<') && Eat ('%')) {
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tokenizer.Verbatim = true;
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attributes.Add (id, "<%" +
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GetVerbatim (tokenizer.get_token (), "%>") + "%>");
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tokenizer.Verbatim = false;
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tokenizer.InTag = true;
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} else {
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OnError ("expected ATTVALUE");
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return null;
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}
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} else {
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attributes.Add (id, null);
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}
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}
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tokenizer.put_back ();
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if (attributes.IsRunAtServer () && !wellFormedForServer) {
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OnError ("The server tag is not well formed.");
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return null;
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}
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return attributes;
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}
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string GetVerbatim (int token, string end)
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{
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StringBuilder vb_text = new StringBuilder ();
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StringBuilder tmp = new StringBuilder ();
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int i = 0;
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if (tokenizer.Value.Length > 1){
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// May be we have a put_back token that is not a single character
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vb_text.Append (tokenizer.Value);
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token = tokenizer.get_token ();
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}
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end = end.ToLower (Helpers.InvariantCulture);
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int repeated = 0;
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for (int k = 0; k < end.Length; k++)
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if (end [0] == end [k])
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repeated++;
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while (token != Token.EOF){
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if (Char.ToLower ((char) token, Helpers.InvariantCulture) == end [i]){
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if (++i >= end.Length)
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break;
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tmp.Append ((char) token);
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token = tokenizer.get_token ();
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continue;
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} else if (i > 0) {
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if (repeated > 1 && i == repeated && (char) token == end [0]) {
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vb_text.Append ((char) token);
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token = tokenizer.get_token ();
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continue;
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}
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vb_text.Append (tmp.ToString ());
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tmp.Remove (0, tmp.Length);
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i = 0;
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}
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vb_text.Append ((char) token);
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token = tokenizer.get_token ();
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}
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if (token == Token.EOF)
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OnError ("Expecting " + end + " and got EOF.");
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return RemoveComments (vb_text.ToString ());
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}
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string RemoveComments (string text)
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{
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int end;
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int start = text.IndexOf ("<%--");
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while (start != -1) {
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end = text.IndexOf ("--%>");
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if (end == -1 || end <= start + 1)
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break;
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text = text.Remove (start, end - start + 4);
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start = text.IndexOf ("<%--");
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}
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return text;
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}
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void GetServerTag (out TagType tagtype, out string id, out TagAttributes attributes)
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{
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string inside_tags;
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bool old = tokenizer.ExpectAttrValue;
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tokenizer.ExpectAttrValue = false;
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if (Eat ('@')){
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tokenizer.ExpectAttrValue = old;
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tagtype = TagType.Directive;
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id = "";
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if (Eat (Token.DIRECTIVE))
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id = tokenizer.Value;
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attributes = GetAttributes ();
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if (!Eat ('%') || !Eat ('>'))
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OnError ("expecting '%>'");
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return;
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}
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if (Eat (Token.DOUBLEDASH)) {
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tokenizer.ExpectAttrValue = old;
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tokenizer.Verbatim = true;
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inside_tags = GetVerbatim (tokenizer.get_token (), "--%>");
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tokenizer.Verbatim = false;
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id = null;
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attributes = null;
|
|
tagtype = TagType.ServerComment;
|
|
return;
|
|
}
|
|
|
|
tokenizer.ExpectAttrValue = old;
|
|
bool varname;
|
|
bool databinding;
|
|
#if NET_4_0
|
|
bool codeRenderEncode;
|
|
#endif
|
|
varname = Eat ('=');
|
|
databinding = !varname && Eat ('#');
|
|
#if NET_4_0
|
|
codeRenderEncode = !databinding && !varname && Eat (':');
|
|
#endif
|
|
string odds = tokenizer.Odds;
|
|
|
|
tokenizer.Verbatim = true;
|
|
inside_tags = GetVerbatim (tokenizer.get_token (), "%>");
|
|
if (databinding && odds != null && odds.Length > 0) {
|
|
databinding = false;
|
|
|
|
// We encountered <% #something here %>, this should be passed
|
|
// verbatim to the compiler
|
|
inside_tags = '#' + inside_tags;
|
|
}
|
|
|
|
tokenizer.Verbatim = false;
|
|
id = inside_tags;
|
|
attributes = null;
|
|
if (databinding)
|
|
tagtype = TagType.DataBinding;
|
|
else if (varname)
|
|
tagtype = TagType.CodeRenderExpression;
|
|
#if NET_4_0
|
|
else if (codeRenderEncode)
|
|
tagtype = TagType.CodeRenderEncode;
|
|
#endif
|
|
else
|
|
tagtype = TagType.CodeRender;
|
|
}
|
|
|
|
public override string ToString ()
|
|
{
|
|
StringBuilder sb = new StringBuilder ("AspParser {");
|
|
if (filename != null && filename.Length > 0)
|
|
sb.AppendFormat ("{0}:{1}.{2}", filename, beginLine, beginColumn);
|
|
sb.Append ('}');
|
|
|
|
return sb.ToString ();
|
|
}
|
|
|
|
void OnError (string msg)
|
|
{
|
|
ParseErrorHandler eh = events [errorEvent] as ParseErrorHandler;
|
|
if (eh != null)
|
|
eh (this, msg);
|
|
}
|
|
|
|
void OnTagParsed (TagType tagtype, string id, TagAttributes attributes)
|
|
{
|
|
TagParsedHandler eh = events [tagParsedEvent] as TagParsedHandler;
|
|
if (eh != null)
|
|
eh (this, tagtype, id, attributes);
|
|
}
|
|
|
|
void OnTextParsed (string text)
|
|
{
|
|
TextParsedHandler eh = events [textParsedEvent] as TextParsedHandler;
|
|
if (eh != null)
|
|
eh (this, text);
|
|
}
|
|
|
|
void OnParsingComplete ()
|
|
{
|
|
ParsingCompleteHandler eh = events [parsingCompleteEvent] as ParsingCompleteHandler;
|
|
if (eh != null)
|
|
eh ();
|
|
}
|
|
}
|
|
}
|
|
|