import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.parser.*;

import com.sun.tools.javac.util.*;

import java.io.*;

import java.net.*;

import java.nio.*;

import java.nio.charset.Charset;

import java.util.Arrays;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.type.DeclaredType;

import javax.lang.model.type.TypeMirror;

import javax.lang.model.util.Elements;

import javax.lang.model.util.Types;

import javax.tools.*;

import static javax.tools.StandardLocation.CLASS_PATH;

import static javax.tools.StandardLocation.SOURCE_PATH;

import static javax.tools.StandardLocation.CLASS_OUTPUT;

public class TestJavacTaskScanner extends ToolTester {

final JavacTaskImpl task;

final Elements elements;

final Types types;

int numTokens;

int numParseTypeElements;

int numAllMembers;

TestJavacTaskScanner(File file) {

final Iterable<? extends JavaFileObject> compilationUnits =

fm.getJavaFileObjects(new File[] {file});

StandardJavaFileManager fm = getLocalFileManager(tool, null, null);

task = (JavacTaskImpl)tool.getTask(null, fm, null, null, null, compilationUnits);

task.getContext().put(ScannerFactory.scannerFactoryKey,

new MyScanner.Factory(task.getContext(), this));

elements = task.getElements();

types = task.getTypes();

}

public void run() {

Iterable<? extends TypeElement> toplevels;

try {

toplevels = task.enter(task.parse());

} catch (IOException ex) {

throw new AssertionError(ex);

}

for (TypeElement clazz : toplevels) {

System.out.format("Testing %s:%n%n", clazz.getSimpleName());

testParseType(clazz);

testGetAllMembers(clazz);

System.out.println();

System.out.println();

System.out.println();

}

System.out.println("#tokens: " + numTokens);

System.out.println("#parseTypeElements: " + numParseTypeElements);

System.out.println("#allMembers: " + numAllMembers);

check(numTokens, "#Tokens", 1222);

check(numParseTypeElements, "#parseTypeElements", 136);

check(numAllMembers, "#allMembers", 67);

}

void check(int value, String name, int expected) {

// allow some slop in the comparison to allow for minor edits in the

// test and in the platform

if (value < expected * 9 / 10)

throw new Error(name + " lower than expected; expected " + expected + "; found: " + value);

if (value > expected * 11 / 10)

throw new Error(name + " higher than expected; expected " + expected + "; found: " + value);

}

void testParseType(TypeElement clazz) {

DeclaredType type = (DeclaredType)task.parseType("List<String>", clazz);

for (Element member : elements.getAllMembers((TypeElement)type.asElement())) {

TypeMirror mt = types.asMemberOf(type, member);

System.out.format("%s : %s -> %s%n", member.getSimpleName(), member.asType(), mt);

numParseTypeElements++;

}

}

public static void main(String... args) throws IOException {

String srcdir = System.getProperty("test.src");

new TestJavacTaskScanner(new File(srcdir, args[0])).run();

}

private void testGetAllMembers(TypeElement clazz) {

for (Element member : elements.getAllMembers(clazz)) {

System.out.format("%s : %s%n", member.getSimpleName(), member.asType());

numAllMembers++;

}

}

/* Similar to ToolTester.getFileManager, except that this version also ensures

public StandardJavaFileManager getLocalFileManager(JavaCompiler tool,

DiagnosticListener<JavaFileObject> dl,

Charset encoding) {

File javac_classes;

try {

final String javacMainClass = "com/sun/tools/javac/Main.class";

URL url = getClass().getClassLoader().getResource(javacMainClass);

if (url == null)

throw new Error("can't locate javac classes");

URI uri = url.toURI();

String scheme = uri.getScheme();

String ssp = uri.getSchemeSpecificPart();

if (scheme.equals("jar")) {

javac_classes = new File(new URI(ssp.substring(0, ssp.indexOf("!/"))));

} else if (scheme.equals("file")) {

javac_classes = new File(ssp.substring(0, ssp.indexOf(javacMainClass)));

} else

throw new Error("unknown URL: " + url);

} catch (URISyntaxException e) {

throw new Error(e);

}

System.err.println("javac_classes: " + javac_classes);

StandardJavaFileManager fm = tool.getStandardFileManager(dl, null, encoding);

try {

fm.setLocation(SOURCE_PATH, Arrays.asList(test_src));

fm.setLocation(CLASS_PATH, join(test_class_path, Arrays.asList(javac_classes)));

fm.setLocation(CLASS_OUTPUT, Arrays.asList(test_classes));

} catch (IOException e) {

throw new AssertionError(e);

}

return fm;

}

}

class MyScanner extends Scanner {

public static class Factory extends ScannerFactory {

public Factory(Context context, TestJavacTaskScanner test) {

super(context);

this.test = test;

}

@Override

public Scanner newScanner(CharSequence input, boolean keepDocComments) {

assert !keepDocComments;

if (input instanceof CharBuffer) {

return new MyScanner(this, (CharBuffer)input, test);

} else {

char[] array = input.toString().toCharArray();

return newScanner(array, array.length, keepDocComments);

}

}

@Override

public Scanner newScanner(char[] input, int inputLength, boolean keepDocComments) {

assert !keepDocComments;

return new MyScanner(this, input, inputLength, test);

}

private TestJavacTaskScanner test;

}

protected MyScanner(ScannerFactory fac, CharBuffer buffer, TestJavacTaskScanner test) {

super(fac, buffer);

this.test = test;

}

protected MyScanner(ScannerFactory fac, char[] input, int inputLength, TestJavacTaskScanner test) {

super(fac, input, inputLength);

this.test = test;

}

public void nextToken() {

super.nextToken();

System.err.format("Saw token %s (%s)%n", token(), name());

test.numTokens++;

}

private TestJavacTaskScanner test;

}