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#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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