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RhinoASTScriptAnalyzer.java
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RhinoASTScriptAnalyzer.java
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/*
Copyright (c) 2004-2012, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
package org.dojotoolkit.optimizer.servlet;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.dojotoolkit.json.JSONSerializer;
import org.dojotoolkit.server.util.resource.ResourceLoader;
import org.dojotoolkit.server.util.rhino.RhinoClassLoader;
import org.mozilla.javascript.CompilerEnvirons;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Parser;
import org.mozilla.javascript.Token;
import org.mozilla.javascript.ast.ArrayLiteral;
import org.mozilla.javascript.ast.AstNode;
import org.mozilla.javascript.ast.AstRoot;
import org.mozilla.javascript.ast.FunctionCall;
import org.mozilla.javascript.ast.Name;
import org.mozilla.javascript.ast.NodeVisitor;
import org.mozilla.javascript.ast.NumberLiteral;
import org.mozilla.javascript.ast.ObjectLiteral;
import org.mozilla.javascript.ast.ObjectProperty;
import org.mozilla.javascript.ast.StringLiteral;
import org.mozilla.javascript.ast.VariableDeclaration;
import org.mozilla.javascript.ast.VariableInitializer;
public class RhinoASTScriptAnalyzer extends ScriptAnalyzer implements NodeVisitor {
private static Logger logger = Logger.getLogger("org.dojotoolkit.optimizer.servlet");
private Map<String, Object> results = null;
public RhinoASTScriptAnalyzer(ResourceLoader resourceLoader, RhinoClassLoader rhinoClassLoader) {
super(resourceLoader, rhinoClassLoader);
}
public Map<String, Object> analyze(String script) throws IOException {
results = new HashMap<String, Object>();
results.put("dependencies", Collections.EMPTY_LIST);
CompilerEnvirons compilerEnv = new CompilerEnvirons();
Parser parser = new Parser(compilerEnv, compilerEnv.getErrorReporter());
try {
AstRoot ast = parser.parse(script, null, 1);
ast.visit(this);
} catch (EvaluatorException e) {
logger.logp(Level.SEVERE, getClass().getName(), "analyze", "EvaluatorException while parsing script", e);
throw new IOException("EvaluatorException while parsing script", e);
}
StringWriter sw = new StringWriter();
JSONSerializer.serialize(sw, results.get("dependencies"), true);
logger.logp(Level.FINE, getClass().getName(), "analyze", "dependencies : "+sw.toString());
if (results.get("config") != null) {
sw = new StringWriter();
JSONSerializer.serialize(sw, results.get("config"), true);
logger.logp(Level.FINE, getClass().getName(), "analyze", "config : "+sw.toString());
}
return results;
}
public boolean visit(AstNode astNode) {
if (astNode instanceof VariableDeclaration) {
VariableDeclaration vd = (VariableDeclaration)astNode;
for (VariableInitializer vi : vd.getVariables()) {
if (vi.getTarget().getType() == Token.NAME) {
Name name = (Name)vi.getTarget();
if (name.getIdentifier().equals("zazlConfig") && vi.getInitializer() instanceof ObjectLiteral) {
results.put("config", parseObject((ObjectLiteral)vi.getInitializer()));
}
}
}
} else if (astNode instanceof FunctionCall) {
FunctionCall functionCall = (FunctionCall)astNode;
AstNode target = functionCall.getTarget();
String callName = "";
if (target instanceof Name) {
callName = ((Name)target).getIdentifier();
}
if (callName.equals("zazl") || callName.equals("require")) {
List<AstNode> args = functionCall.getArguments();
if (args.get(0) instanceof ArrayLiteral) {
results.put("dependencies", getDependencies((ArrayLiteral)args.get(0)));
} else if (args.get(0) instanceof ObjectLiteral && args.get(1) instanceof ArrayLiteral) {
results.put("config", parseObject((ObjectLiteral)args.get(0)));
results.put("dependencies", getDependencies((ArrayLiteral)args.get(1)));
}
}
}
return true;
}
private static List<String> getDependencies(ArrayLiteral al) {
List<String> deps = new ArrayList<String>();
for (AstNode dependency : al.getElements()) {
if (dependency instanceof StringLiteral) {
deps.add(((StringLiteral)dependency).getValue());
}
}
return deps;
}
private static Map<String, Object> parseObject(ObjectLiteral ol) {
Map<String, Object> obj = new HashMap<String, Object>();
for (ObjectProperty op : ol.getElements()) {
String name = op.getLeft().toSource();
AstNode right = op.getRight();
int type = right.getType();
switch (type) {
case Token.ARRAYLIT:
obj.put(name, parseArray((ArrayLiteral)right));
break;
case Token.OBJECTLIT:
obj.put(name, parseObject((ObjectLiteral)right));
break;
case Token.NAME:
obj.put(name, ((Name)right).getIdentifier());
break;
case Token.NUMBER:
obj.put(name, ((NumberLiteral)right).getNumber());
break;
case Token.STRING:
obj.put(name, ((StringLiteral)right).getValue());
break;
case Token.TRUE:
obj.put(name, Boolean.TRUE);
break;
case Token.FALSE:
obj.put(name, Boolean.FALSE);
break;
}
}
return obj;
}
private static List<Object> parseArray(ArrayLiteral al) {
List<Object> array = new ArrayList<Object>();
for (AstNode an : al.getElements()) {
int type = an.getType();
switch (type) {
case Token.ARRAYLIT:
array.add(parseArray((ArrayLiteral)an));
break;
case Token.OBJECTLIT:
array.add(parseObject((ObjectLiteral)an));
break;
case Token.NAME:
array.add(((Name)an).getIdentifier());
break;
case Token.NUMBER:
array.add(((NumberLiteral)an).getNumber());
break;
case Token.STRING:
array.add(((StringLiteral)an).getValue());
break;
}
}
return array;
}
}