private void genVisitor(String pack, Vector<String> incs) throws EGGException {
String nom = table.getNom() + "Visitor";
StringBuffer sb = new StringBuffer();
sb.append("package " + pack + ";\n");
for (String e : incs) {
sb.append("import " + e + ";\n");
}
sb.append("import mg.egg.eggc.runtime.libjava.*;\n");
// création de la classe
sb.append("public class " + nom + " implements IDstVisitor {\n");
sb.append("protected boolean visitNode(IDstNode node){\n return true;}\n");
sb.append("public boolean visit(IDstNode node){\n");
// les visiteurs externes
Vector<String> evs = new Vector<String>();
// redirection vers les visiteurs specifiques
for (NtJava nt : nterms) {
if (nt.estExterne()) {
String en = nt.getNom();
evs.add(en);
sb.append(" if (node.getClass() == c" + en + "){\n");
sb.append(" node.accept(f" + en + "Visitor);\n");
sb.append(" }\n");
} else {
sb.append(" if (node instanceof " + nt.getNomClasse() + ")\n");
sb.append(" return visit((" + nt.getNomClasse() + ") node);\n");
}
}
// le terminal
sb.append(" if (node instanceof T_" + table.getNom() + ")\n");
sb.append(" return visit((T_" + table.getNom() + ") node);\n");
sb.append(" return false;\n}\n");
sb.append("public void endVisit(IDstNode node){\n");
// redirection vers les visiteurs spécifiques
for (NtJava nt : nterms) {
if (!nt.estExterne()) {
sb.append(" if (node instanceof " + nt.getNomClasse() + ")\n");
sb.append(" endVisit((" + nt.getNomClasse() + ") node);\n");
}
}
sb.append(" }\n");
// declaration des externes
for (String ev : evs) {
sb.append("private Class c" + ev + "= new " + ev + "().getAxiom().getClass();\n");
sb.append("public " + ev + "Visitor f" + ev + "Visitor;\n");
}
// creation du constructeur sans arg
sb.append("public " + nom + "(");
int i = 0;
for (String ev : evs) {
sb.append(ev + "Visitor v" + ++i);
if (i < evs.size()) sb.append(",");
}
i = 1;
sb.append("){\n");
for (String ev : evs) {
sb.append(" f" + ev + "Visitor = v" + i++ + ";\n");
}
sb.append(" }\n");
// création du constructeur avec arg
if (evs.size() != 0) {
sb.append("public " + nom + "(){\n");
for (String ev : evs) {
sb.append(" f" + ev + "Visitor = new " + ev + "Visitor();\n");
}
sb.append(" }\n");
}
// création des visiteurs spécifiques pour les non-terminaux
for (NtJava nt : nterms) {
if (nt.estExterne()) continue;
sb.append(
"public boolean visit(" + nt.getNomClasse() + " node ){\n return visitNode(node);\n}\n");
sb.append("public void endVisit(" + nt.getNomClasse() + " node){\n}\n");
}
// idem pour les terminaux
sb.append("public boolean visit(T_" + table.getNom() + " node){\n return false;}\n");
sb.append("public void endVisit(T_" + table.getNom() + " node){\n}\n");
sb.append("}\n");
table.getCompilationUnit().createFile(nom + ".java", sb.toString());
}
