| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.js.ast; |
| |
| import com.google.gwt.dev.jjs.SourceInfo; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Represents a JavaScript function expression. |
| */ |
| public final class JsFunction extends JsLiteral implements HasName { |
| |
| private static void trace(String title, String code) { |
| System.out.println("---------------------------"); |
| System.out.println(title + ":"); |
| System.out.println("---------------------------"); |
| System.out.println(code); |
| } |
| |
| protected JsBlock body; |
| protected final List<JsParameter> params = new ArrayList<JsParameter>(); |
| protected final JsScope scope; |
| private boolean artificiallyRescued; |
| private boolean executeOnce; |
| private boolean fromJava; |
| private JsFunction impliedExecute; |
| private JsName name; |
| private boolean trace = false; |
| private boolean traceFirst = true; |
| |
| /** |
| * Creates an anonymous function. |
| */ |
| public JsFunction(SourceInfo sourceInfo, JsScope parent) { |
| this(sourceInfo, parent, null, false); |
| } |
| |
| /** |
| * Creates a function that is not derived from Java source. |
| */ |
| public JsFunction(SourceInfo sourceInfo, JsScope parent, JsName name) { |
| this(sourceInfo, parent, name, false); |
| } |
| |
| /** |
| * Creates a named function, possibly derived from Java source. |
| */ |
| public JsFunction(SourceInfo sourceInfo, JsScope parent, JsName name, |
| boolean fromJava) { |
| super(sourceInfo); |
| assert (parent != null); |
| this.fromJava = fromJava; |
| setName(name); |
| String scopeName = (name == null) ? "<anonymous>" : name.getIdent(); |
| scopeName = "function " + scopeName; |
| this.scope = new JsScope(parent, scopeName); |
| } |
| |
| public JsBlock getBody() { |
| return body; |
| } |
| |
| /** |
| * If true, this indicates that only the first invocation of the function will |
| * have any effects. Subsequent invocations may be considered to be no-op |
| * calls whose return value is ignored. |
| */ |
| public boolean getExecuteOnce() { |
| return executeOnce; |
| } |
| |
| public JsFunction getImpliedExecute() { |
| return impliedExecute; |
| } |
| |
| public JsName getName() { |
| return name; |
| } |
| |
| public List<JsParameter> getParameters() { |
| return params; |
| } |
| |
| public JsScope getScope() { |
| return scope; |
| } |
| |
| @Override |
| public boolean hasSideEffects() { |
| // If there's a name, the name is assigned to. |
| return name != null; |
| } |
| |
| public boolean isArtificiallyRescued() { |
| return artificiallyRescued; |
| } |
| |
| public boolean isBooleanFalse() { |
| return false; |
| } |
| |
| public boolean isBooleanTrue() { |
| return true; |
| } |
| |
| @Override |
| public boolean isDefinitelyNotNull() { |
| return true; |
| } |
| |
| @Override |
| public boolean isDefinitelyNull() { |
| return false; |
| } |
| |
| public boolean isFromJava() { |
| return fromJava; |
| } |
| |
| public void setArtificiallyRescued(boolean rescued) { |
| this.artificiallyRescued = rescued; |
| } |
| |
| public void setBody(JsBlock body) { |
| this.body = body; |
| } |
| |
| public void setExecuteOnce(boolean executeOnce) { |
| this.executeOnce = executeOnce; |
| } |
| |
| public void setFromJava(boolean fromJava) { |
| this.fromJava = fromJava; |
| } |
| |
| public void setImpliedExecute(JsFunction impliedExecute) { |
| this.impliedExecute = impliedExecute; |
| } |
| |
| public void setName(JsName name) { |
| this.name = name; |
| if (name != null) { |
| if (isFromJava()) { |
| name.setStaticRef(this); |
| } |
| } |
| } |
| |
| public void setTrace() { |
| this.trace = true; |
| } |
| |
| public void traverse(JsVisitor v, JsContext<JsExpression> ctx) { |
| String before = null; |
| if (trace && v instanceof JsModVisitor) { |
| before = this.toSource(); |
| if (traceFirst) { |
| traceFirst = false; |
| trace("SCRIPT INITIAL", before); |
| } |
| } |
| if (v.visit(this, ctx)) { |
| v.acceptWithInsertRemove(params); |
| body = v.accept(body); |
| } |
| v.endVisit(this, ctx); |
| if (trace && v instanceof JsModVisitor) { |
| String after = this.toSource(); |
| if (!after.equals(before)) { |
| String title = v.getClass().getSimpleName(); |
| trace(title, after); |
| } |
| } |
| } |
| } |