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package org.javacs;
import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;
import java.util.stream.Collectors;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.type.*;
import javax.lang.model.util.AbstractTypeVisitor8;
class TemplatePrinter extends AbstractTypeVisitor8<String, Void> {
private Map<TypeMirror, Integer> parameters = new HashMap<>();
private int parameter(TypeMirror t) {
if (parameters.containsKey(t)) {
return parameters.get(t);
} else {
parameters.put(t, parameters.size() + 1);
return parameters.get(t);
}
}
String print(TypeMirror type) {
return type.accept(this, null);
}
@Override
public String visitIntersection(IntersectionType t, Void aVoid) {
var types = new StringJoiner(" & ");
for (var b : t.getBounds()) {
types.add(print(b));
}
return "? extends " + types;
}
@Override
public String visitUnion(UnionType t, Void aVoid) {
return "UNION";
}
@Override
public String visitPrimitive(PrimitiveType t, Void aVoid) {
return t.toString();
}
@Override
public String visitNull(NullType t, Void aVoid) {
return "NULL";
}
@Override
public String visitArray(ArrayType t, Void aVoid) {
return print(t.getComponentType()) + "[]";
}
@Override
public String visitDeclared(DeclaredType t, Void aVoid) {
var result = t.asElement().getSimpleName().toString();
if (!t.getTypeArguments().isEmpty()) {
String params = t.getTypeArguments().stream().map(this::print).collect(Collectors.joining(", "));
result += "<" + params + ">";
}
if (result.matches("java\\.lang\\.\\w+")) return result.substring("java.lang.".length());
else if (result.startsWith("java\\.util\\.\\w+")) return result.substring("java.util.".length());
else return result;
}
@Override
public String visitError(ErrorType t, Void aVoid) {
return "ERROR";
}
@Override
public String visitTypeVariable(TypeVariable t, Void aVoid) {
return "$" + parameter(t);
}
@Override
public String visitWildcard(WildcardType t, Void aVoid) {
return "?";
}
@Override
public String visitExecutable(ExecutableType t, Void aVoid) {
return "EXECUTABLE";
}
@Override
public String visitNoType(NoType t, Void aVoid) {
return "void";
}
private String printArguments(ExecutableElement e) {
var result = new StringJoiner(", ");
for (var p : e.getParameters()) {
result.add(print(p.asType()) + " " + p.getSimpleName());
}
return result.toString();
}
String printMethod(ExecutableElement m) {
if (m.getSimpleName().contentEquals("<init>")) {
return m.getEnclosingElement().getSimpleName() + "(" + printArguments(m) + ")";
} else {
if (m.getModifiers().contains(Modifier.STATIC)) return "ERROR " + m.getSimpleName() + " IS STATIC";
if (m.getModifiers().contains(Modifier.PRIVATE)) return "ERROR " + m.getSimpleName() + " IS PRIVATE";
var result = new StringBuilder();
// public void foo
if (m.getModifiers().contains(Modifier.PUBLIC)) result.append("public ");
if (m.getModifiers().contains(Modifier.PROTECTED)) result.append("protected ");
result.append(print(m.getReturnType())).append(" ");
result.append(m.getSimpleName());
// (int arg, String other)
result.append("(").append(printArguments(m)).append(")");
// throws Foo, Bar
if (!m.getThrownTypes().isEmpty()) {
result.append(" throws ");
var types = new StringJoiner(", ");
for (var t : m.getThrownTypes()) {
types.add(print(t));
}
result.append(types);
}
return result.toString();
}
}
}
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