com.cryptomorin.xseries.reflection.parser.ReflectionParser Maven / Gradle / Ivy
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A set of utilities for Minecraft plugins
package com.cryptomorin.xseries.reflection.parser;
import com.cryptomorin.xseries.reflection.Handle;
import com.cryptomorin.xseries.reflection.XReflection;
import com.cryptomorin.xseries.reflection.jvm.*;
import com.cryptomorin.xseries.reflection.jvm.classes.DynamicClassHandle;
import com.cryptomorin.xseries.reflection.jvm.classes.PackageHandle;
import com.cryptomorin.xseries.reflection.minecraft.MinecraftPackage;
import org.intellij.lang.annotations.Language;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* This class is designed to be able to parse Java declarations only in a loose way, as it also
* supports more simplified syntax (for example not requiring semicolons) that doesn't work
* as nicely if you're using IntelliJ because of the highlighting which is greater advantage.
* TODO support generics. Using RegEx might be impossible because Java doesn't support (?R) recursion.
*/
public class ReflectionParser {
private final String declaration;
private Pattern pattern;
private Matcher matcher;
private ReflectiveNamespace namespace;
private Map> cachedImports;
private final Set flags = EnumSet.noneOf(Flag.class);
private static final PackageHandle[] PACKAGE_HANDLES = MinecraftPackage.values();
public ReflectionParser(@Language("Java") String declaration) {
this.declaration = declaration;
}
private enum Flag {
PUBLIC, PROTECTED, PRIVATE, FINAL, TRANSIENT, ABSTRACT, STATIC, NATIVE, SYNCHRONIZED, STRICTFP, VOLATILE;
@SuppressWarnings("RegExpUnnecessaryNonCapturingGroup")
private static final String FLAGS_REGEX = "(?(?:(?:" + Arrays.stream(Flag.values())
.map(Enum::name)
.map(x -> x.toLowerCase(Locale.ENGLISH))
.collect(Collectors.joining("|"))
+ ")\\s*)+)?";
}
@Language("RegExp")
private static final String JAVA_TYPE_REGEX = PackageHandle.JAVA_IDENTIFIER_PATTERN + "(<[\\w<>\\[\\], ]+>)?((?:\\[])*)";
@Language("RegExp")
private static String id(@Language("RegExp") String groupName) {
if (groupName == null) return PackageHandle.JAVA_IDENTIFIER_PATTERN;
return "(?<" + groupName + '>' + PackageHandle.JAVA_IDENTIFIER_PATTERN + ')';
}
@Language("RegExp")
private static String type(@Language("RegExp") String groupName) {
if (groupName == null) return JAVA_TYPE_REGEX;
return "(?<" + groupName + '>' + JAVA_TYPE_REGEX + ')';
}
private Class[] parseTypes(String[] typeNames) {
Class[] classes = new Class[typeNames.length];
for (int i = 0; i < typeNames.length; i++) {
String typeName = typeNames[i];
typeName = typeName.trim().substring(0, typeName.lastIndexOf(' ')).trim();
classes[i] = parseType(typeName);
}
return classes;
}
private static final Map> PREDEFINED_TYPES = new HashMap<>();
static {
Arrays.asList(
byte.class, short.class, int.class, long.class, float.class, double.class, boolean.class, char.class, void.class,
Byte.class, Short.class, Integer.class, Long.class, Float.class, Double.class, Boolean.class, Character.class, Void.class,
String.class, Optional.class, StringBuilder.class, StringBuffer.class, UUID.class
).forEach(x -> PREDEFINED_TYPES.put(x.getSimpleName(), x));
}
private Class parseType(String typeName) {
if (this.cachedImports == null && this.namespace != null) {
this.cachedImports = this.namespace.getImports();
}
String firstTypeName = typeName;
int arrayDimension = 0;
if (typeName.endsWith("[]")) { // Arrays
String replaced = typeName.replace("[]", "");
arrayDimension = (typeName.length() - replaced.length()) / 2;
typeName = replaced;
}
if (typeName.endsWith(">")) { // Generic
typeName = typeName.substring(0, typeName.indexOf('<'));
}
Class clazz = null;
if (!typeName.contains(".")) {
clazz = PREDEFINED_TYPES.get(typeName);
if (clazz == null && cachedImports != null) clazz = this.cachedImports.get(typeName);
}
if (clazz == null) {
try {
clazz = Class.forName(typeName);
} catch (ClassNotFoundException ignored) {
}
}
if (clazz == null) error("Unknown type '" + firstTypeName + "' -> '" + typeName + '\'');
if (arrayDimension != 0) {
clazz = XReflection.of(clazz).asArray(arrayDimension).unreflect();
}
return clazz;
}
@Language("RegExp")
private static final String PACKAGE_REGEX = "(?:package\\s+(?" + PackageHandle.JAVA_PACKAGE_PATTERN + ")\\s*;\\s*)?";
@Language("RegExp")
private static final String CLASS_TYPES = "(?class|interface|enum)";
@Language("RegExp")
private static final String PARAMETERS = "\\s*\\(\\s*(?[\\w$_,. ]+)?\\s*\\)";
@Language("RegExp")
private static final String END_DECL = "\\s*;?\\s*";
@Language("RegExp")
private static final String GENERIC = "(?:<" + id(null) + ">)*";
private static final Pattern CLASS = Pattern.compile(PACKAGE_REGEX + Flag.FLAGS_REGEX + CLASS_TYPES + "\\s+" + id("className") +
"(?:\\s+extends\\s+" + id("superclasses") + ")?\\s+(implements\\s+" + id("interfaces") + ")?(?:\\s*\\{\\s*})?\\s*");
private static final Pattern METHOD = Pattern.compile(Flag.FLAGS_REGEX + type("methodReturnType") + "\\s+"
+ id("methodName") + PARAMETERS + END_DECL);
private static final Pattern CONSTRUCTOR = Pattern.compile(Flag.FLAGS_REGEX + "\\s+"
+ id("className") + PARAMETERS + END_DECL);
private static final Pattern FIELD = Pattern.compile(Flag.FLAGS_REGEX + id("fieldType") + "\\s+"
+ id("fieldName") + END_DECL);
public ReflectionParser imports(ReflectiveNamespace namespace) {
this.namespace = namespace;
return this;
}
private void pattern(Pattern pattern, Handle handle) {
this.pattern = pattern;
this.matcher = pattern.matcher(declaration);
start(handle);
}
public T parseClass(T classHandle) {
pattern(CLASS, classHandle);
String packageName = group("package");
if (packageName != null && !packageName.isEmpty()) {
boolean found = false;
for (PackageHandle pkgHandle : PACKAGE_HANDLES) {
String targetPackageName = pkgHandle.packageId().toLowerCase(Locale.ENGLISH);
if (packageName.startsWith(targetPackageName)) {
classHandle.inPackage(pkgHandle, packageName.substring(targetPackageName.length() + 1)); // + 1 for the dot
found = true;
break;
}
}
if (!found) classHandle.inPackage(packageName);
}
// String classGeneric = parser.group("generic");
classHandle.named(group("className").split("\\$"));
return classHandle;
}
public T parseConstructor(T ctorHandle) {
pattern(CONSTRUCTOR, ctorHandle);
if (has("className")) {
if (!ctorHandle.getClassHandle().getPossibleNames().contains(group("className")))
error("Wrong class name associated to constructor, possible names: " + ctorHandle.getClassHandle().getPossibleNames());
}
if (has("parameters")) ctorHandle.parameters(parseTypes(group("parameters").split(",")));
return ctorHandle;
}
public T parseMethod(T methodHandle) {
pattern(METHOD, methodHandle);
// String classGeneric = parser.group("generic");
methodHandle.named(group("methodName").split("\\$"));
methodHandle.returns(parseType(group("methodReturnType")));
if (has("parameters")) methodHandle.parameters(parseTypes(group("parameters").split(",")));
return methodHandle;
}
public T parseField(T fieldHandle) {
pattern(FIELD, fieldHandle);
// String classGeneric = parser.group("generic");
fieldHandle.named(group("fieldName").split("\\$"));
fieldHandle.returns(parseType(group("fieldType")));
return fieldHandle;
}
private String group(String groupName) {
return this.matcher.group(groupName);
}
private boolean has(String groupName) {
String group = group(groupName);
return group != null && !group.isEmpty();
}
private void start(Handle handle) {
if (!matcher.matches()) error("Not a " + handle + " declaration");
parseFlags();
if (handle instanceof MemberHandle) {
MemberHandle memberHandle = (MemberHandle) handle;
if (hasOneOf(flags, Flag.PRIVATE, Flag.PROTECTED)) {
memberHandle.makeAccessible();
}
if (handle instanceof FieldMemberHandle) {
if (flags.contains(Flag.FINAL)) ((FieldMemberHandle) handle).asFinal();
}
if (handle instanceof NamedMemberHandle) {
if (flags.contains(Flag.STATIC)) ((NamedMemberHandle) handle).asStatic();
}
}
}
private void parseFlags() {
if (!has("flags")) return;
String flagsStr = group("flags");
for (String flag : flagsStr.split("\\s+")) {
if (!flags.add(Flag.valueOf(flag.toUpperCase()))) {
error("Repeated flag: " + flag);
}
}
if (containsDuplicates(flags, Flag.PUBLIC, Flag.PROTECTED, Flag.PRIVATE)) {
error("Duplicate visibility flags");
}
}
@SafeVarargs
private static boolean containsDuplicates(Collection collection, T... values) {
boolean contained = false;
for (T value : values) {
if (collection.contains(value)) {
if (contained) return true;
else contained = true;
}
}
return false;
}
@SafeVarargs
private static boolean hasOneOf(Collection collection, T... elements) {
return Arrays.stream(elements).anyMatch(collection::contains);
}
private void error(String message) {
throw new RuntimeException(message + " in: " + declaration + " (RegEx: " + pattern.pattern() + "), (Imports: " + cachedImports + ')');
}
}
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