public Token Parse( Token source )
{
this.Source = source.String;
int sourceEned = this.Source.Length;
this.Line = 1;
this.BOL = true;
this.EnableOutput = true;
//Accumulate ouput into this token
var output = new Token( Token.Kind.Text );
int emptyLines = 0;
//Enabel output only if all embedded #if's were true
bool oldOutputEnabled = true;
bool outputEnabled = true;
int outputDisabledLine = 0;
for ( int i = 0; i < sourceEned; i++ )
{
int oldLine = this.Line;
Token t = this.GetToken( true );
NextToken:
switch ( t.Type )
{
case Token.Kind.Error:
return t;
case Token.Kind.EOS:
return output; //Force termination
case Token.Kind.Comment:
//C comments are replaced with single spaces.
if ( outputEnabled )
{
output.Append( " ", 1 );
output.AppendNL( this.Line - oldLine );
}
break;
case Token.Kind.Linecomment:
//C++ comments are ignored
continue;
case Token.Kind.Directive:
t = this.HandleDirective( t, oldLine );
outputEnabled = this.EnableOutput;
if ( outputEnabled != oldOutputEnabled )
{
if ( outputEnabled )
{
output.AppendNL( oldLine - outputDisabledLine );
}
else
{
outputDisabledLine = oldLine;
}
oldOutputEnabled = outputEnabled;
}
if ( outputEnabled )
{
output.AppendNL( this.Line - oldLine - t.CountNL );
}
goto NextToken;
case Token.Kind.Linecont:
//Backslash-Newline sequences are delted, no matter where.
emptyLines++;
break;
case Token.Kind.Newline:
if ( emptyLines > 0 )
{
// Compensate for the backslash-newline combinations
// we have encountered, otherwise line numeration is broken
if ( outputEnabled )
{
output.AppendNL( emptyLines );
}
emptyLines = 0;
}
goto default;
case Token.Kind.Whitespace:
default:
//Passthrough all other tokens
if ( outputEnabled )
{
output.Append( t );
}
break;
}
}
if ( this.EnableOutput == false )
{
this.Error( this.Line, "Unclosed #if at end of source", null );
return Token.Error;
}
return output;
}
