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//
// XslAvt.cs
//
// Author:
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2003 Ben Maurer
//
//
// 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.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
namespace Mono.Xml.Xsl.Operations {
// Represents an Attribute Value Template in XSL.
internal class XslAvt {
string simpleString;
ArrayList avtParts;
public XslAvt (string str, Compiler comp) {
if (str.IndexOf ("{") == -1 && str.IndexOf ("}") == -1) {
// That was easy ;-).
simpleString = str;
return;
}
avtParts = new ArrayList ();
StringBuilder sb = new StringBuilder ();
StringReader r = new StringReader (str);
while (r.Peek () != -1) {
char c = (char)r.Read ();
switch (c) {
case '{':
if ((char)r.Peek () == '{') {
// {{ == escaped {
sb.Append ((char)r.Read ());
break;
}
if (sb.Length != 0) {
// Ok, we have already found a text
// part, lets save that.
avtParts.Add (new SimpleAvtPart (sb.ToString ()));
sb.Length = 0;
}
while ((c = (char)r.Read ()) != '}') {
switch (c) {
case '\'': case '"': {
// We are inside a quote
char unq = c;
sb.Append (c);
while ((c = (char)r.Read ()) != unq) {
sb.Append (c);
if (r.Peek () == -1)
throw new XsltCompileException ("Unexpected end of AVT", null, comp.Input);
}
sb.Append (c);
break;
} // ' or "
default:
sb.Append (c);
break;
}
if (r.Peek () == -1) throw new XsltCompileException ("Unexpected end of AVT", null, comp.Input);
}
avtParts.Add (new XPathAvtPart (comp.CompileExpression (sb.ToString ())));
sb.Length = 0;
break;
case '}':
c = (char)r.Read ();
if (c != '}')
throw new XsltCompileException ("Braces must be escaped", null, comp.Input);
goto default;
default:
sb.Append (c);
break;
}
}
if (sb.Length != 0) {
// Ok, we have already found a text
// part, lets save that.
avtParts.Add (new SimpleAvtPart (sb.ToString ()));
sb.Length = 0;
}
}
public static string AttemptPreCalc (ref XslAvt avt)
{
if (avt == null) return null;
if (avt.simpleString != null) {
string s = avt.simpleString;
avt = null;
return s;
}
return null;
}
public string Evaluate (XslTransformProcessor p)
{
if (simpleString != null) return simpleString;
if (avtParts.Count == 1)
return ((AvtPart) avtParts [0]).Evaluate (p);
StringBuilder sb = p.GetAvtStringBuilder ();
int len = avtParts.Count;
for (int i = 0; i < len; i++)
sb.Append (((AvtPart) avtParts [i]).Evaluate (p));
return p.ReleaseAvtStringBuilder ();
}
// Represents part of an AVT
abstract class AvtPart {
public abstract string Evaluate (XslTransformProcessor p);
}
sealed class SimpleAvtPart : AvtPart {
string val;
public SimpleAvtPart (string val)
{
this.val = val;
}
public override string Evaluate (XslTransformProcessor p)
{
return val;
}
}
sealed class XPathAvtPart : AvtPart {
XPathExpression expr;
public XPathAvtPart (XPathExpression expr)
{
this.expr = expr;
}
public override string Evaluate (XslTransformProcessor p)
{
return p.EvaluateString (expr);
}
}
}
}
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