//
// System.Web.Compilation.AspTokenizer
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Marek Habersack <mhabersack@novell.com>
//
// (C) 2002,2003 Ximian, Inc (http://www.ximian.com)
// (C) 2003-2009 Novell, Inc (http://novell.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace System.Web.Compilation{
class Token
{
public const int EOF = 0x0200000;
public const int IDENTIFIER = 0x0200001;
public const int DIRECTIVE = 0x0200002;
public const int ATTVALUE = 0x0200003;
public const int TEXT = 0x0200004;
public const int DOUBLEDASH = 0x0200005;
public const int CLOSING = 0x0200006;
}
class AspTokenizer
{
const int CHECKSUM_BUF_SIZE = 8192;
class PutBackItem
{
public readonly string Value;
public readonly int Position;
public readonly int CurrentToken;
public readonly bool InTag;
public PutBackItem (string value, int position, int currentToken, bool inTag)
{
Value = value;
Position = position;
CurrentToken = currentToken;
InTag = inTag;
}
}
static char [] lfcr = new char [] { '\n', '\r' };
TextReader sr;
int current_token;
StringBuilder sb, odds;
int col, line;
int begcol, begline;
int position;
bool inTag;
bool expectAttrValue;
bool alternatingQuotes;
bool hasPutBack;
bool verbatim;
bool have_value;
bool have_unget;
int unget_value;
string val;
Stack putBackBuffer;
MD5 checksum;
char[] checksum_buf = new char [CHECKSUM_BUF_SIZE];
int checksum_buf_pos = -1;
public MD5 Checksum {
get { return checksum; }
}
public AspTokenizer (TextReader reader)
{
this.sr = reader;
sb = new StringBuilder ();
odds= new StringBuilder();
col = line = 1;
hasPutBack = inTag = false;
}
public bool Verbatim
{
get { return verbatim; }
set { verbatim = value; }
}
public void put_back ()
{
if (hasPutBack && !inTag)
throw new HttpException ("put_back called twice!");
hasPutBack = true;
if (putBackBuffer == null)
putBackBuffer = new Stack ();
string val = Value;
putBackBuffer.Push (new PutBackItem (val, position, current_token, inTag));
position -= val.Length;
}
public int get_token ()
{
if (hasPutBack) {
PutBackItem pbi;
if (verbatim) {
pbi = putBackBuffer.Pop () as PutBackItem;
string value = pbi.Value;
switch (value.Length) {
case 0:
// do nothing, CurrentToken will be used
break;
case 1:
pbi = new PutBackItem (String.Empty, pbi.Position, (int)value [0], false);
break;
default:
pbi = new PutBackItem (value, pbi.Position, (int)value [0], false);
break;
}
} else
pbi = putBackBuffer.Pop () as PutBackItem;
hasPutBack = putBackBuffer.Count > 0;
position = pbi.Position;
have_value = false;
val = null;
sb = new StringBuilder (pbi.Value);
current_token = pbi.CurrentToken;
inTag = pbi.InTag;
return current_token;
}
begline = line;
begcol = col;
have_value = false;
current_token = NextToken ();
return current_token;
}
bool is_identifier_start_character (char c)
{
return (Char.IsLetter (c) || c == '_' );
}
bool is_identifier_part_character (char c)
{
return (Char.IsLetterOrDigit (c) || c == '_' || c == '-');
}
void ungetc (int value)
{
have_unget = true;
unget_value = value;
// Only '/' passes through here now.
// If we ever let \n here, update 'line'
position--;
col--;
}
void TransformNextBlock (int count, bool final)
{
byte[] input = Encoding.UTF8.GetBytes (checksum_buf, 0, count);
if (checksum == null)
checksum = MD5.Create ();
if (final)
checksum.TransformFinalBlock (input, 0, input.Length);
else
checksum.TransformBlock (input, 0, input.Length, input, 0);
input = null;
checksum_buf_pos = -1;
}
void UpdateChecksum (int c)
{
bool final = c == -1;
if (!final) {
if (checksum_buf_pos + 1 >= CHECKSUM_BUF_SIZE)
TransformNextBlock (checksum_buf_pos + 1, false);
checksum_buf [++checksum_buf_pos] = (char)c;
} else
TransformNextBlock (checksum_buf_pos + 1, true);
}
int read_char ()
{
int c;
if (have_unget) {
c = unget_value;
have_unget = false;
} else {
c = sr.Read ();
UpdateChecksum (c);
}
if (c == '\r' && sr.Peek () == '\n') {
c = sr.Read ();
UpdateChecksum (c);
position++;
}
if (c == '\n'){
col = -1;
line++;
}
if (c != -1) {
col++;
position++;
}
return c;
}
int ReadAttValue (int start)
{
int quoteChar = 0;
bool quoted = false;
if (start == '"' || start == '\'') {
quoteChar = start;
quoted = true;
} else {
sb.Append ((char) start);
}
int c;
int last = 0;
bool inServerTag = false;
alternatingQuotes = true;
while ((c = sr.Peek ()) != -1) {
if (c == '%' && last == '<') {
inServerTag = true;
} else if (inServerTag && c == '>' && last == '%') {
inServerTag = false;
} else if (!inServerTag) {
if (!quoted && c == '/') {
read_char ();
c = sr.Peek ();
if (c == -1) {
c = '/';
} else if (c == '>') {
ungetc ('/');
break;
}
} else if (!quoted && (c == '>' || Char.IsWhiteSpace ((char) c))) {
break;
} else if (quoted && c == quoteChar && last != '\\') {
read_char ();
break;
}
} else if (quoted && c == quoteChar) {
alternatingQuotes = false;
}
sb.Append ((char) c);
read_char ();
last = c;
}
return Token.ATTVALUE;
}
int NextToken ()
{
int c;
sb.Length = 0;
odds.Length=0;
while ((c = read_char ()) != -1){
if (verbatim){
inTag = false;
sb.Append ((char) c);
return c;
}
if (inTag && expectAttrValue && (c == '"' || c == '\''))
return ReadAttValue (c);
if (c == '<'){
inTag = true;
sb.Append ((char) c);
return c;
}
if (c == '>'){
inTag = false;
sb.Append ((char) c);
return c;
}
if (current_token == '<' && "%/!".IndexOf ((char) c) != -1){
sb.Append ((char) c);
return c;
}
if (inTag && current_token == '%' && "@#=".IndexOf ((char) c) != -1){
if (odds.Length == 0 || odds.ToString ().IndexOfAny (lfcr) < 0) {
sb.Append ((char) c);
return c;
}
sb.Append ((char) c);
continue;
}
if (inTag && c == '-' && sr.Peek () == '-'){
sb.Append ("--");
read_char ();
return Token.DOUBLEDASH;
}
if (!inTag){
sb.Append ((char) c);
while ((c = sr.Peek ()) != -1 && c != '<')
sb.Append ((char) read_char ());
return (c != -1 || sb.Length > 0) ? Token.TEXT : Token.EOF;
}
if (inTag && current_token == '=' && !Char.IsWhiteSpace ((char) c))
return ReadAttValue (c);
if (inTag && is_identifier_start_character ((char) c)){
sb.Append ((char) c);
while ((c = sr.Peek ()) != -1) {
if (!is_identifier_part_character ((char) c) && c != ':')
break;
sb.Append ((char) read_char ());
}
if (current_token == '@' && Directive.IsDirective (sb.ToString ()))
return Token.DIRECTIVE;
return Token.IDENTIFIER;
}
if (!Char.IsWhiteSpace ((char) c)) {
sb.Append ((char) c);
return c;
}
// keep otherwise discarded characters in case we need.
odds.Append((char) c);
}
return Token.EOF;
}
public string Value {
get {
if (have_value)
return val;
have_value = true;
val = sb.ToString ();
return val;
}
}
public string Odds {
get {
return odds.ToString();
}
}
public bool InTag {
get { return inTag; }
set { inTag = value; }
}
// Hack for preventing confusion with VB comments (see bug #63451)
public bool ExpectAttrValue {
get { return expectAttrValue; }
set { expectAttrValue = value; }
}
public bool AlternatingQuotes {
get { return alternatingQuotes; }
}
public int BeginLine {
get { return begline; }
}
public int BeginColumn {
get { return begcol; }
}
public int EndLine {
get { return line; }
}
public int EndColumn {
get { return col; }
}
public int Position {
get { return position; }
}
}
}
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