protected void outputAbstractVisitorCases(NodeType root, TabPrintWriter writer, String retType) {
// Write out case methods for each concrete class
for (NodeType t : ast.descendents(root)) {
if (!t.isAbstract()) {
writer.println();
writer.startLine("/** Process an instance of " + t.name() + ". */");
writer.startLine(
"public abstract " + retType + " " + visitorMethodName(t) + "(" + t.name() + " that);");
}
}
}
protected void outputDelegatingForCase(
NodeType t,
TabPrintWriter writer,
NodeType root,
String retType,
String suff,
String defaultMethod) {
outputForCaseHeader(t, writer, retType, suff);
writer.indent();
if (!retType.equals("void")) {
writer.startLine("return ");
} else {
writer.startLine();
}
Option<NodeType> sup = ast.parent(t);
if (sup.isSome() && !t.equals(root)) {
writer.print(visitorMethodName(sup.unwrap()) + suff + "(that);");
} else {
writer.print(defaultMethod + "(that);");
}
writer.unindent();
writer.startLine("}");
writer.println();
}
protected void outputDefaultCaseVoidMethod(TabPrintWriter writer, NodeType root) {
writer.startLine("/**");
writer.startLine(" * This method is run for all cases that are not handled elsewhere.");
writer.startLine(" * By default, it is a no-op; subclasses may override this behavior.");
writer.startLine("**/");
writer.startLine("public void defaultCase(" + root.name() + " that) {");
writer.print("}");
}
protected void outputForCaseHeader(
NodeType t,
TabPrintWriter writer,
String retType,
String suff,
Iterable<String> extraParams) {
writer.startLine("public ");
writer.print(retType);
writer.print(" ");
writer.print(visitorMethodName(t));
writer.print(suff + "("); // Only(
writer.print(t.name() + " that");
for (String p : extraParams) {
writer.print(", " + p);
}
writer.print(") {");
}
protected void outputDefaultCaseMethod(TabPrintWriter writer, NodeType root) {
writer.startLine("/**");
writer.startLine(" * This method is run for all cases that are not handled elsewhere.");
writer.startLine(
" * By default, an exception is thrown; subclasses may override this behavior.");
writer.startLine(" * @throws IllegalArgumentException");
writer.startLine("**/");
writer.startLine("public RetType defaultCase(" + root.name() + " that) {");
writer.indent();
writer.startLine("throw new IllegalArgumentException(\"Visitor \" + getClass().getName()");
writer.print(" + \" does not support visiting values of type \" + that.getClass().getName());");
writer.unindent();
writer.startLine("}");
}
