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package org.javacs;
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 ShortTypePrinter extends AbstractTypeVisitor8<String, Void> {
private ShortTypePrinter() {}
static String print(TypeMirror type) {
// TODO allow packageContext which suppresses printing of those package prefixes
return type.accept(new ShortTypePrinter(), null);
}
@Override
public String visitIntersection(IntersectionType t, Void aVoid) {
return t.getBounds().stream().map(ShortTypePrinter::print).collect(Collectors.joining(" & "));
}
@Override
public String visitUnion(UnionType t, Void aVoid) {
return t.getAlternatives().stream().map(ShortTypePrinter::print).collect(Collectors.joining(" | "));
}
@Override
public String visitPrimitive(PrimitiveType t, Void aVoid) {
return t.toString();
}
@Override
public String visitNull(NullType t, Void aVoid) {
return t.toString();
}
@Override
public String visitArray(ArrayType t, Void aVoid) {
return print(t.getComponentType()) + "[]";
}
@Override
public String visitDeclared(DeclaredType t, Void aVoid) {
var result = t.asElement().toString();
if (!t.getTypeArguments().isEmpty()) {
String params =
t.getTypeArguments().stream().map(ShortTypePrinter::print).collect(Collectors.joining(", "));
result += "<" + params + ">";
}
if (result.startsWith("java.lang")) return result.substring("java.lang.".length());
else if (result.startsWith("java.util")) return result.substring("java.util.".length());
else return result;
}
@Override
public String visitError(ErrorType t, Void aVoid) {
return "???";
}
@Override
public String visitTypeVariable(TypeVariable t, Void aVoid) {
String result = t.asElement().toString();
// TypeMirror upper = t.getUpperBound();
// NOTE this can create infinite recursion
// if (!upper.toString().equals("java.lang.Object"))
// result += " extends " + print(upper);
return result;
}
@Override
public String visitWildcard(WildcardType t, Void aVoid) {
String result = "?";
if (t.getSuperBound() != null) result += " super " + print(t.getSuperBound());
if (t.getExtendsBound() != null) result += " extends " + print(t.getExtendsBound());
return result;
}
@Override
public String visitExecutable(ExecutableType t, Void aVoid) {
return t.toString();
}
@Override
public String visitNoType(NoType t, Void aVoid) {
return t.toString();
}
static boolean missingParamNames(ExecutableElement e) {
return e.getParameters().stream().allMatch(p -> p.getSimpleName().toString().matches("arg\\d+"));
}
private static String printArguments(ExecutableElement e) {
var result = new StringJoiner(", ");
var missingParamNames = missingParamNames(e);
for (var p : e.getParameters()) {
var s = new StringBuilder();
s.append(ShortTypePrinter.print(p.asType()));
if (!missingParamNames) {
s.append(" ").append(p.getSimpleName());
}
result.add(s);
}
return result.toString();
}
static String printMethod(ExecutableElement m) {
if (m.getSimpleName().contentEquals("<init>")) {
return m.getEnclosingElement().getSimpleName() + "(" + printArguments(m) + ")";
} else {
var result = new StringBuilder();
// static void foo
if (m.getModifiers().contains(Modifier.STATIC)) result.append("static ");
result.append(ShortTypePrinter.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(ShortTypePrinter.print(t));
}
result.append(types);
}
return result.toString();
}
}
}
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