From 469bbcf0701e1eb8a6670c23145b0da87357e178 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Sun, 25 Mar 2012 20:00:08 +0000
Subject: Code is all reorganized.  We're about ready to release.  I should
 write up a little explenation of the arrangement.

---
 src/experimental/xmlreader.cpp | 173 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 src/experimental/xmlreader.cpp

(limited to 'src/experimental/xmlreader.cpp')

diff --git a/src/experimental/xmlreader.cpp b/src/experimental/xmlreader.cpp
new file mode 100644
index 0000000..ba7fb3d
--- /dev/null
+++ b/src/experimental/xmlreader.cpp
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#include "bu/xmlreader.h"
+#include "bu/stream.h"
+
+namespace Bu { subExceptionDef( XmlException ) }
+
+Bu::XmlReader::XmlReader( Stream &rInput ) :
+	rInput( rInput ),
+	iCurToken( 0 ),
+	iNextToken( 0 ),
+	bIgnoreWS( true )
+{
+	nextToken();
+	stDocument();
+}
+
+Bu::XmlReader::~XmlReader()
+{
+}
+
+void Bu::XmlReader::fillBuffer()
+{
+	if( rInput.isEos() )
+		return;
+	char buf[1024];
+	int iSize = rInput.read( buf, 1024 );
+	sBuf.append( buf, iSize );
+}
+
+void Bu::XmlReader::cleanupBuffer( int iUsed )
+{
+	for( int j = 0; j < iUsed; j++ )
+	{
+		if( sBuf[j] == '\n' )
+		{
+			spNextToken.iLine++;
+			spNextToken.iChar = 1;
+		}
+		else
+		{
+			spNextToken.iChar++;
+		}
+	}
+
+	printf("--Deleting %d bytes from front of buffer.\n", iUsed );
+	sBuf.trimFront( iUsed );
+}
+
+int Bu::XmlReader::nextToken()
+{
+	fillBuffer();
+
+	int iUsed = 1;
+
+	iCurToken = iNextToken;
+	spCurToken = spNextToken;
+
+	switch( sBuf[0] )
+	{
+		case '<':
+			if( !strncmp( sBuf.getStr(), "<?xml", 5 ) )
+			{
+				iNextToken = tokXmlDeclHead;
+				iUsed = 5;
+			}
+			else
+			{
+				iNextToken = '<';
+			}
+			break;
+
+		case '?':
+			if( sBuf[1] == '>' )
+			{
+				iNextToken = tokXmlDeclEnd;
+				iUsed = 2;
+			}
+			else
+			{
+				iNextToken = '?';
+			}
+			break;
+
+		case ' ':
+		case '\t':
+		case '\n':
+		case '\r':
+			for( int j = 1;; j++ )
+			{
+				if( j == sBuf.getSize() )
+				{
+					if( rInput.isEos() )
+						error("Reached end of input while waiting for whitespace to end.");
+
+					fillBuffer();
+				}
+				if( sBuf[j] == ' ' || sBuf[j] == '\t' ||
+					sBuf[j] == '\n' || sBuf[j] == '\r' )
+					iUsed++;
+				else
+					break;
+			}
+			sStr.clear();
+			sStr.append( sBuf, iUsed );
+			iNextToken = tokWS;
+			break;
+
+		case '=':
+			iNextToken = sBuf[0];
+			break;
+
+		default:
+			if( (sBuf[0] >= 'a' && sBuf[0] <= 'z') ||
+				(sBuf[0] >= 'A' && sBuf[0] <= 'Z') )
+			{
+				for( int j = 1;; j++ )
+				{
+					if( j == sBuf.getSize() )
+					{
+						if( rInput.isEos() )
+							error("Reached end of input while waiting for a string to end.");
+
+						fillBuffer();
+					}
+					if( (sBuf[j] >= 'a' && sBuf[j] <= 'z') ||
+						(sBuf[j] >= 'A' && sBuf[j] <= 'Z') )
+						iUsed++;
+					else
+						break;
+				}
+				sStr.clear();
+				sStr.append( sBuf, iUsed );
+				iNextToken = tokIdent;
+			}
+	}
+
+	cleanupBuffer( iUsed );
+
+	return iCurToken;
+}
+
+void Bu::XmlReader::error( const char *sMessage )
+{
+	throw Bu::XmlException("%d:%d:  %s",
+		spCurToken.iLine, spCurToken.iChar, sMessage );
+}
+
+void Bu::XmlReader::stDocument()
+{
+	stProlog();
+}
+
+void Bu::XmlReader::stProlog()
+{
+	stXmlDecl();
+}
+
+void Bu::XmlReader::stXmlDecl()
+{
+	if( nextToken() != tokXmlDeclHead )
+		error("You must begin your xml file with a declaration: <?xml ... ?>");
+	if( nextToken() != tokIdent )
+		error("A version comes first!");
+	if( sStr != "version" )
+		error("No, a version!");
+}
+
-- 
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