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Java example source code file (ForNode.java)
The ForNode.java Java example source code/* * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.nashorn.internal.ir; import jdk.nashorn.internal.ir.annotations.Immutable; import jdk.nashorn.internal.ir.visitor.NodeVisitor; /** * IR representing a FOR statement. */ @Immutable public final class ForNode extends LoopNode { /** Initialize expression. */ private final Expression init; /** Test expression. */ private final Expression modify; /** Iterator symbol. */ private Symbol iterator; /** Is this a normal for loop? */ public static final int IS_FOR = 1 << 0; /** Is this a normal for in loop? */ public static final int IS_FOR_IN = 1 << 1; /** Is this a normal for each in loop? */ public static final int IS_FOR_EACH = 1 << 2; private final int flags; /** * Constructor * * @param lineNumber line number * @param token token * @param finish finish * @param init initialization expression * @param test test * @param body body * @param modify modify * @param flags flags */ public ForNode(final int lineNumber, final long token, final int finish, final Expression init, final Expression test, final Block body, final Expression modify, final int flags) { super(lineNumber, token, finish, test, body, false); this.init = init; this.modify = modify; this.flags = flags; } private ForNode(final ForNode forNode, final Expression init, final Expression test, final Block body, final Expression modify, final int flags, final boolean controlFlowEscapes) { super(forNode, test, body, controlFlowEscapes); this.init = init; this.modify = modify; this.flags = flags; this.iterator = forNode.iterator; //TODO is this acceptable? symbols are never cloned, just copied as references } @Override public Node ensureUniqueLabels(LexicalContext lc) { return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } @Override public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) { if (visitor.enterForNode(this)) { return visitor.leaveForNode( setInit(lc, init == null ? null : (Expression)init.accept(visitor)). setTest(lc, test == null ? null : (Expression)test.accept(visitor)). setModify(lc, modify == null ? null : (Expression)modify.accept(visitor)). setBody(lc, (Block)body.accept(visitor))); } return this; } @Override public void toString(final StringBuilder sb) { sb.append("for ("); if (isForIn()) { init.toString(sb); sb.append(" in "); modify.toString(sb); } else { if (init != null) { init.toString(sb); } sb.append("; "); if (test != null) { test.toString(sb); } sb.append("; "); if (modify != null) { modify.toString(sb); } } sb.append(')'); } @Override public boolean hasGoto() { return !isForIn() && test == null; } @Override public boolean mustEnter() { if (isForIn()) { return false; //may be an empty set to iterate over, then we skip the loop } return test == null; } /** * Get the initialization expression for this for loop * @return the initialization expression */ public Expression getInit() { return init; } /** * Reset the initialization expression for this for loop * @param lc lexical context * @param init new initialization expression * @return new for node if changed or existing if not */ public ForNode setInit(final LexicalContext lc, final Expression init) { if (this.init == init) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } /** * Is this a for in construct rather than a standard init;condition;modification one * @return true if this is a for in constructor */ public boolean isForIn() { return (flags & IS_FOR_IN) != 0; } /** * Flag this to be a for in construct * @param lc lexical context * @return new for node if changed or existing if not */ public ForNode setIsForIn(final LexicalContext lc) { return setFlags(lc, flags | IS_FOR_IN); } /** * Is this a for each construct, known from e.g. Rhino. This will be a for of construct * in ECMAScript 6 * @return true if this is a for each construct */ public boolean isForEach() { return (flags & IS_FOR_EACH) != 0; } /** * Flag this to be a for each construct * @param lc lexical context * @return new for node if changed or existing if not */ public ForNode setIsForEach(final LexicalContext lc) { return setFlags(lc, flags | IS_FOR_EACH); } /** * If this is a for in or for each construct, there is an iterator symbol * @return the symbol for the iterator to be used, or null if none exists */ public Symbol getIterator() { return iterator; } /** * Assign an iterator symbol to this ForNode. Used for for in and for each constructs * @param iterator the iterator symbol */ public void setIterator(final Symbol iterator) { this.iterator = iterator; } /** * Get the modification expression for this ForNode * @return the modification expression */ public Expression getModify() { return modify; } /** * Reset the modification expression for this ForNode * @param lc lexical context * @param modify new modification expression * @return new for node if changed or existing if not */ public ForNode setModify(final LexicalContext lc, final Expression modify) { if (this.modify == modify) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } @Override public Expression getTest() { return test; } @Override public ForNode setTest(final LexicalContext lc, final Expression test) { if (this.test == test) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } @Override public Block getBody() { return body; } @Override public ForNode setBody(final LexicalContext lc, final Block body) { if (this.body == body) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } @Override public ForNode setControlFlowEscapes(final LexicalContext lc, final boolean controlFlowEscapes) { if (this.controlFlowEscapes == controlFlowEscapes) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } private ForNode setFlags(final LexicalContext lc, final int flags) { if (this.flags == flags) { return this; } return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes)); } } Other Java examples (source code examples)Here is a short list of links related to this Java ForNode.java source code file: |
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