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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 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]; } }





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