static bool TryExpandMacros(string input, out string output, out IEnumerable <Message> messages)
{
var inputStream = CharStreams.fromstring(input);
var lexer = new GoToLexer(inputStream);
var lexerErrorListener = new LexerErrorListener();
lexer.AddErrorListener(lexerErrorListener);
var expansionMessages = new List <Message>(lexerErrorListener.Messages);
var tokenStream = new CommonTokenStream(lexer);
var parser = new GoToParser(tokenStream);
var parserErrorListener = new ParserErrorListener();
parser.AddErrorListener(parserErrorListener);
var contextSyntaxTree = parser.program();
expansionMessages.AddRange(parserErrorListener.Messages);
var listener = new MacroExpansionListener(tokenStream);
ParseTreeWalker.Default.Walk(listener, contextSyntaxTree);
expansionMessages.AddRange(listener.Messages);
messages = expansionMessages;
if (AreThereErrors(expansionMessages))
{
output = string.Empty;
return(false);
}
var dirtyOutput = listener.RewrittenTokenStream.GetText();
output = dirtyOutput.TrimStart(Environment.NewLine.ToCharArray());
return(true);
}
public static bool TryAnalyze(
string input,
out string expandedInput,
out ProgramNode program,
out IEnumerable <Message> messages)
{
program = null;
var analysisMessages = new List <Message>();
messages = analysisMessages;
var isExpansionSucceeded = TryExpandMacros(
input,
out string output,
out IEnumerable <Message> expasionMessages);
analysisMessages.AddRange(expasionMessages);
if (isExpansionSucceeded)
{
expandedInput = output;
}
else
{
expandedInput = input;
return(false);
}
var inputStream = CharStreams.fromstring(output);
var lexer = new GoToLexer(inputStream);
var lexerErrorListener = new LexerErrorListener();
lexer.AddErrorListener(lexerErrorListener);
analysisMessages.AddRange(lexerErrorListener.Messages);
var tokenStream = new CommonTokenStream(lexer);
var parser = new GoToParser(tokenStream);
var parserErrorListener = new ParserErrorListener();
parser.AddErrorListener(parserErrorListener);
var contextSyntaxTree = parser.program();
analysisMessages.AddRange(parserErrorListener.Messages);
var listener = new SemanticListener();
ParseTreeWalker.Default.Walk(listener, contextSyntaxTree);
analysisMessages.AddRange(listener.Messages);
if (AreThereErrors(messages))
{
return(false);
}
var abstractSyntaxTreeGenerator = new AbstractSyntaxTreeGenerator();
program = abstractSyntaxTreeGenerator.VisitProgram(contextSyntaxTree) as ProgramNode;
SemanticAnalyzer.Check(program, ref analysisMessages);
if (AreThereErrors(messages))
{
return(false);
}
return(true);
}