preamble.parser

JDK1.4编译器前端

%header {:
 package parser;
 import AST.*;
:};
%embed {:
  class Events extends Parser.Events {
    public void scannerError(Scanner.Exception e) {
      errors.add(new Problem(null, e.getMessage(), e.line, e.column, Problem.Severity.ERROR, Problem.Kind.LEXICAL));
    }
    public void syntaxError(Symbol token) {
      int line = token.getLine(token.getStart());
      int column = token.getColumn(token.getStart());
      int endLine = token.getLine(token.getEnd());
      int endColumn = token.getColumn(token.getEnd());
      String value = token.value != null ? token.value.toString() : Terminals.NAMES[token.getId()];
      errors.add(new Problem(null, "unexpected token \"" + value + "\"", line, column, endLine, endColumn, Problem.Severity.ERROR, Problem.Kind.SYNTACTIC));
    }
    public void unexpectedTokenRemoved(Symbol token) {
    }
    public void missingTokenInserted(Symbol token) {
    }
    public void misspelledTokenReplaced(Symbol token) {
    }
    public void errorPhraseRemoved(Symbol error) {
    }
  }

        {
            report = new Events(); // Use error handler in parser
        }

   public CompilationUnit parse(java.io.InputStream is, String fileName) throws java.io.IOException, beaver.Parser.Exception {
     CompilationUnit cu;
     errors = new ArrayList();
     try {
       scanner.JavaScanner scanner = new scanner.JavaScanner(new scanner.Unicode(is));
       cu = (CompilationUnit)parse(scanner);
     } catch(Parser.Exception e) {
       // build empty compilation unit for failed error recovery
       cu = new CompilationUnit();
     } catch(Error e) {
       cu = new CompilationUnit();
       errors.add(new Problem(null, e.getMessage(), 0, 0, Problem.Severity.ERROR, Problem.Kind.LEXICAL));
     }
     for(java.util.Iterator iter = errors.iterator(); iter.hasNext(); ) {
       Problem p = (Problem)iter.next();
       p.setFileName(fileName);
       cu.addParseError(p);
     }
     return cu;
   }
   protected java.util.Collection errors = new ArrayList();
:};