BodyBodyElementaryVisitor.java from DrJava at Krugle
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package edu.rice.cs.javalanglevels;
import edu.rice.cs.javalanglevels.tree.*;
import edu.rice.cs.javalanglevels.parser.*;
import java.util.*;
import java.io.*;
import junit.framework.TestCase;
/*
* Language Level Visitor that represents the Elementary Language Level. Enforces constraints during the
* first walk of the AST (checking for langauge specific errors and building the symbol table).
* This class enforces things that are common to all contexts reachable within a method body or other body
* (not class or interface body) at the Elementary Language Level).
*/
public class BodyBodyElementaryVisitor extends ElementaryVisitor {
/**The MethodData of this method. */
private BodyData _bodyData;
/*
* Constructor for BodyBodyElementaryVisitor.
* @param bodyData The BodyData that encloses the context we are visiting.
* @param file The source file this came from.
* @param packageName The package the source file is in
* @importedFiles A list of classes that were specifically imported
* @param importedPackages A list of package names that were specifically imported
* @param classDefsInThisFile A list of the classes that are defined in the source file
* @param continuations A hashtable corresponding to the continuations (unresolved Symbol Datas) that will need to be resolved
*/
public BodyBodyElementaryVisitor(BodyData bodyData, File file, String packageName, LinkedList<String> importedFiles,
LinkedList<String> importedPackages, LinkedList<String> classDefsInThisFile, Hashtable<String, Pair<SourceInfo, LanguageLevelVisitor>> continuations) {
super(file, packageName, importedFiles, importedPackages, classDefsInThisFile, continuations);
_bodyData = bodyData;
}
/*Give an appropriate error*/
public void forMethodDefDoFirst(MethodDef that) {
_addError("Methods definitions cannot appear within the body of another method or block.", that);
}
/* There is currently no way to differentiate between a block statement and
* an instance initializer in a braced body given the general nature of a
* braced body. Whenever an instance initialization is visited in a method
* body, we must assume that it is a block statement.
*/
public void forInstanceInitializer(InstanceInitializer that) {
forBlock(that.getCode());
}
/* Visit this BlockData with a new BodyBodyElementary visitor after making sure no errors need to be thrown.*/
public void forBlock(Block that) {
forBlockDoFirst(that);
if (_checkError()) {
return;
}
BlockData bd = new BlockData(_bodyData);
_bodyData.addBlock(bd);
that.getStatements().visit(new BodyBodyElementaryVisitor(bd, _file, _package, _importedFiles, _importedPackages, _classNamesInThisFile, continuations));
}
/*Add the variables that were declared to the body data and make sure that no two
* variables have the same name.*/
public void forVariableDeclarationOnly(VariableDeclaration that) {
if (!_bodyData.addFinalVars(_variableDeclaration2VariableData(that, _bodyData))) {
_addAndIgnoreError("You cannot have two variables with the same name.", that);
}
}
/**
* Call the super method to convert these to a VariableData array, then make sure that
* each VariableData gets set to be final, as required at the Elementary level.
* @param enclosingData The Data which contains the variables
*/
protected VariableData[] _variableDeclaration2VariableData(VariableDeclaration vd, Data enclosingData) {
VariableData[] vds = llVariableDeclaration2VariableData(vd, enclosingData);
for (int i = 0; i < vds.length; i++) {
if (vds[i].getMav().getModifiers().length > 0) {
StringBuffer s = new StringBuffer("the keyword(s) ");
String[] modifiers = vds[i].getMav().getModifiers();
for (int j = 0; j<modifiers.length; j++) { s.append("\"" + modifiers[j] + "\" "); }
_addAndIgnoreError("You cannot use " + s.toString() + "to declare a local variable at the Elementary level", vd);
}
vds[i].setFinal();
}
return vds;
}
/**
* Test most of the methods declared above right here:
*/
public static class BodyBodyElementaryVisitorTest extends TestCase {
private BodyBodyElementaryVisitor _bbv;
private SymbolData _sd1;
private MethodData _md1;
private ModifiersAndVisibility _publicMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[] {"public"});
private ModifiersAndVisibility _protectedMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[] {"protected"});
private ModifiersAndVisibility _privateMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[] {"private"});
private ModifiersAndVisibility _packageMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[0]);
private ModifiersAndVisibility _abstractMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[] {"abstract"});
private ModifiersAndVisibility _finalMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[] {"final"});
private ModifiersAndVisibility _finalPrivateMav = new ModifiersAndVisibility(JExprParser.NO_SOURCE_INFO, new String[]{"final", "private"});
public BodyBodyElementaryVisitorTest() {
this("");
}
public BodyBodyElementaryVisitorTest(String name) {
super(name);
}
public void setUp() {
_sd1 = new SymbolData("i.like.monkey");
_md1 = new MethodData("methodName", _publicMav, new TypeParameter[0], SymbolData.INT_TYPE,
new VariableData[0],
new String[0],
_sd1,
null);
errors = new LinkedList<Pair<String, JExpressionIF>>();
symbolTable = new Symboltable();
visitedFiles = new LinkedList<Pair<LanguageLevelVisitor, edu.rice.cs.javalanglevels.tree.SourceFile>>();
_hierarchy = new Hashtable<String, TypeDefBase>();
_classesToBeParsed = new Hashtable<String, Pair<TypeDefBase, LanguageLevelVisitor>>();
_bbv = new BodyBodyElementaryVisitor(_md1, new File(""), "", new LinkedList<String>(), new LinkedList<String>(), new LinkedList<String>(), new Hashtable<String, Pair<SourceInfo, LanguageLevelVisitor>>());
_bbv.continuations = new Hashtable<String, Pair<SourceInfo, LanguageLevelVisitor>>();
_bbv._resetNonStaticFields();
_bbv._importedPackages.addFirst("java.lang");
_errorAdded = false;
}
public void testForMethodDefDoFirst() {
ConcreteMethodDef cmd = new ConcreteMethodDef(JExprParser.NO_SOURCE_INFO,
_packageMav,
new TypeParameter[0],
new PrimitiveType(JExprParser.NO_SOURCE_INFO, "int"),
new Word(JExprParser.NO_SOURCE_INFO, "methodName"),
new FormalParameter[0],
new ReferenceType[0],
new BracedBody(JExprParser.NO_SOURCE_INFO, new BodyItemI[0]));
cmd.visit(_bbv);
assertEquals("There should be one error.", 1, errors.size());
assertEquals("The error message should be correct.",
"Methods definitions cannot appear within the body of another method or block.",
errors.get(0).getFirst());
}
/* These last two tests are shared with ClassBodyElementaryVisitor,
* perhaps we could factor them out. */
public void testForVariableDeclarationOnly() {
// Check one that works
VariableDeclaration vdecl = new VariableDeclaration(JExprParser.NO_SOURCE_INFO,
_packageMav,
new VariableDeclarator[] {
new UninitializedVariableDeclarator(JExprParser.NO_SOURCE_INFO,
new PrimitiveType(JExprParser.NO_SOURCE_INFO, "double"),
new Word (JExprParser.NO_SOURCE_INFO, "field1")),
new UninitializedVariableDeclarator(JExprParser.NO_SOURCE_INFO,
new PrimitiveType(JExprParser.NO_SOURCE_INFO, "boolean"),
new Word (JExprParser.NO_SOURCE_INFO, "field2"))});
VariableData vd1 = new VariableData("field1", _finalMav, SymbolData.DOUBLE_TYPE, false, _bbv._bodyData);
VariableData vd2 = new VariableData("field2", _finalMav, SymbolData.BOOLEAN_TYPE, false, _bbv._bodyData);
vdecl.visit(_bbv);
assertEquals("There should not be any errors.", 0, errors.size());
assertTrue("field1 was added.", _md1.getVars().contains(vd1));
assertTrue("field2 was added.", _md1.getVars().contains(vd2));
// Check one that doesn't work
VariableDeclaration vdecl2 = new VariableDeclaration(JExprParser.NO_SOURCE_INFO,
_packageMav,
new VariableDeclarator[] {
new UninitializedVariableDeclarator(JExprParser.NO_SOURCE_INFO,
new PrimitiveType(JExprParser.NO_SOURCE_INFO, "double"),
new Word (JExprParser.NO_SOURCE_INFO, "field3")),
new UninitializedVariableDeclarator(JExprParser.NO_SOURCE_INFO,
new PrimitiveType(JExprParser.NO_SOURCE_INFO, "int"),
new Word (JExprParser.NO_SOURCE_INFO, "field3"))});
VariableData vd3 = new VariableData("field3", _finalMav, SymbolData.DOUBLE_TYPE, false, _bbv._bodyData);
vdecl2.visit(_bbv);
assertEquals("There should be one error.", 1, errors.size());
assertEquals("The error message should be correct", "You cannot have two variables with the same name.", errors.get(0).getFirst());
assertTrue("field3 was added.", _md1.getVars().contains(vd3));
}
}
}
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