public virtual void ParseAndBuildAST( TextReader r )
{
// BUILD AST FROM GRAMMAR
ANTLRLexer lexer = new ANTLRLexer( new Antlr.Runtime.ANTLRReaderStream( r ) );
lexer.Filename = this.FileName;
// use the rewrite engine because we want to buffer up all tokens
// in case they have a merged lexer/parser, send lexer rules to
// new grammar.
//lexer.setTokenObjectClass( "antlr.TokenWithIndex" );
tokenBuffer = new Antlr.Runtime.CommonTokenStream( lexer );
//tokenBuffer = new TokenStreamRewriteEngine( lexer );
//tokenBuffer.Discard( ANTLRParser.WS, ANTLRParser.ML_COMMENT, ANTLRParser.COMMENT, ANTLRParser.SL_COMMENT );
//tokenBuffer.discard( ANTLRParser.WS );
//tokenBuffer.discard( ANTLRParser.ML_COMMENT );
//tokenBuffer.discard( ANTLRParser.COMMENT );
//tokenBuffer.discard( ANTLRParser.SL_COMMENT );
ANTLRParser parser = new ANTLRParser( tokenBuffer );
parser.FileName = this.FileName;
Antlr.Runtime.IAstRuleReturnScope<GrammarAST> result = null;
try
{
result = parser.grammar_( this );
}
//catch ( TokenStreamException tse )
//{
// ErrorManager.internalError( "unexpected stream error from parsing " + fileName, tse );
//}
catch ( RecognitionException re )
{
ErrorManager.InternalError( "unexpected parser recognition error from " + fileName, re );
}
DealWithTreeFilterMode(); // tree grammar and filter=true?
if ( lexer.hasASTOperator && !BuildAST )
{
object value = GetOption( "output" );
if ( value == null )
{
ErrorManager.GrammarWarning( ErrorManager.MSG_REWRITE_OR_OP_WITH_NO_OUTPUT_OPTION,
this, null );
SetOption( "output", "AST", null );
}
else
{
ErrorManager.GrammarError( ErrorManager.MSG_AST_OP_WITH_NON_AST_OUTPUT_OPTION,
this, null, value );
}
}
grammarTree = result.Tree;
if (grammarTree != null && AntlrTool.internalOption_PrintGrammarTree)
Console.WriteLine("grammar tree: " + grammarTree.ToStringTree());
grammarTree.SetUnknownTokenBoundaries();
FileName = lexer.Filename; // the lexer #src might change name
if ( grammarTree.FindFirstType( ANTLRParser.RULE ) == null )
{
ErrorManager.Error( ErrorManager.MSG_NO_RULES, FileName );
}
}
