org.eclipse.jdt.internal.compiler.lookup.SignatureWrapper Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2000, 2019 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contribution for
* Bug 440474 - [null] textual encoding of external null annotations
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.classfmt.ExternalAnnotationProvider;
public class SignatureWrapper {
public char[] signature;
public int start;
public int end;
public int bracket;
private final boolean use15specifics;
private boolean useExternalAnnotations;
public SignatureWrapper(char[] signature, boolean use15specifics) {
this.signature = signature;
this.start = 0;
this.end = this.bracket = -1;
this.use15specifics = use15specifics;
if (!use15specifics) removeTypeArguments();
}
public SignatureWrapper(char[] signature, boolean use15specifics, boolean useExternalAnnotations) {
this.signature = signature;
this.start = 0;
this.end = this.bracket = -1;
this.use15specifics = use15specifics;
this.useExternalAnnotations = useExternalAnnotations;
if (!use15specifics) removeTypeArguments();
}
public SignatureWrapper(char [] signature) {
this(signature, true);
}
public boolean atEnd() {
return this.start < 0 || this.start >= this.signature.length;
}
public boolean isParameterized() {
return this.bracket == this.end;
}
public int computeEnd() {
int index = this.start;
if (this.useExternalAnnotations) {
// in addition to '[' tokens accept null annotations after the first '['
skipDimensions: while(true) {
switch (this.signature[index]) {
case ExternalAnnotationProvider.NONNULL :
case ExternalAnnotationProvider.NULLABLE :
case ExternalAnnotationProvider.NO_ANNOTATION :
if (index == this.start)
break skipDimensions;
//$FALL-THROUGH$
case '[':
index++;
break;
default:
break skipDimensions;
}
}
} else {
while (this.signature[index] == '[')
index++;
}
switch (this.signature[index]) {
case 'L' :
case 'T' :
this.end = CharOperation.indexOf(';', this.signature, this.start);
if (this.bracket <= this.start) // already know it if its > start
this.bracket = CharOperation.indexOf('<', this.signature, this.start);
if (this.bracket > this.start && this.bracket < this.end)
this.end = this.bracket;
else if (this.end == -1)
this.end = this.signature.length + 1;
break;
default :
this.end = index;
}
if (this.use15specifics || this.end != this.bracket) {
this.start = this.end + 1; // skip ';' or '<'
} else {
this.start = skipAngleContents(this.end) + 1; // skip <<>*>;
this.bracket = -1;
}
return this.end;
}
/**
* Removes the generic content from this.signature. Keeps the type parameter of the method, though.
*
* E.g. running the signature <T:Ljava/lang/Object;>(TT;Ljava/lang/String;)TT; through
* this method results in
* <T:Ljava/lang/Object;>(TT;Ljava/lang/String;)TT;
*
* But for the signature (Lp18/Klass<TT;>.MethodInfo<Ljava/lang/String;>.InnerMethodInfo<Ljava/lang/String;>;)V
* it produces (Lp18/Klass.MethodInfo.InnerMethodInfo;)V
*/
private void removeTypeArguments() {
StringBuilder buffer = new StringBuilder();
int offset = 0;
int index = this.start;
if (this.signature[0] == '<') {
index++;
}
for (; index < this.signature.length; index++) {
if (this.signature[index] == '<') {
buffer.append(this.signature, offset, index - offset);
index = offset = skipAngleContents(index);
}
}
buffer.append(this.signature, offset, index - offset);
this.signature = new char[buffer.length()];
buffer.getChars(0, this.signature.length, this.signature, 0);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=324850, do not expose generics if we shouldn't
public int skipAngleContents(int i) {
if (this.signature[i] != '<') {
return i;
}
int depth = 0, length = this.signature.length;
for (++i; i < length; i++) {
switch(this.signature[i]) {
case '<' :
depth++;
break;
case '>' :
if (--depth < 0)
return i + 1;
break;
}
}
return i;
}
public int skipTypeParameter() {
// [Annot] Identifier ClassBound {InterfaceBound}
this.start = CharOperation.indexOf(':', this.signature, this.start);
while (charAtStart() == ':') {
this.start++;
if (charAtStart() != ':') // ClassBound may be empty
this.start = skipAngleContents(computeEnd()) + 1;
}
return this.start;
}
public char[] wordUntil(char c) {
this.end = CharOperation.indexOf(c, this.signature, this.start);
return CharOperation.subarray(this.signature, this.start, this.start = this.end); // skip word
}
public char[] nextWord() {
this.end = CharOperation.indexOf(';', this.signature, this.start);
if (this.bracket <= this.start) // already know it if its > start
this.bracket = CharOperation.indexOf('<', this.signature, this.start);
int dot = CharOperation.indexOf('.', this.signature, this.start);
if (this.bracket > this.start && this.bracket < this.end)
this.end = this.bracket;
if (dot > this.start && dot < this.end)
this.end = dot;
return CharOperation.subarray(this.signature, this.start, this.start = this.end); // skip word
}
/** similar to nextWord() but don't stop at '.' */
public char[] nextName() {
this.end = CharOperation.indexOf(';', this.signature, this.start);
if (this.bracket <= this.start) // already know it if its > start
this.bracket = CharOperation.indexOf('<', this.signature, this.start);
if (this.bracket > this.start && this.bracket < this.end)
this.end = this.bracket;
return CharOperation.subarray(this.signature, this.start, this.start = this.end); // skip name
}
/** answer the next type (incl. type arguments), but don't advance any cursors */
public char[] peekFullType() {
int s = this.start, b = this.bracket, e = this.end;
int peekEnd = skipAngleContents(computeEnd());
this.start = s;
this.bracket = b;
this.end = e;
return CharOperation.subarray(this.signature, s, peekEnd+1);
}
/**
* assuming a previously stored start of 's' followed by a call to computeEnd()
* now retrieve the content between these bounds including trailing angle content
*/
public char[] getFrom(int s) {
if (this.end == this.bracket) {
this.end = skipAngleContents(this.bracket);
this.start = this.end + 1;
}
return CharOperation.subarray(this.signature, s, this.end+1);
}
public char[] tail() {
return CharOperation.subarray(this.signature, this.start, this.signature.length);
}
@Override
public String toString() {
if (this.start >= 0 && this.start <= this.signature.length) {
return new String(CharOperation.subarray(this.signature, 0, this.start)) + " ^ " //$NON-NLS-1$
+ new String(CharOperation.subarray(this.signature, this.start, this.signature.length));
}
return new String(this.signature) + " @ " + this.start; //$NON-NLS-1$
}
public char charAtStart() {
return this.signature[this.start];
}
}