classcodevisitorsupport.java

大名鼎鼎的java动态脚本语言。已经通过了sun的认证

/*
 * ClassCodeVisitorSupport.java created on 14.12.2005
 *
 */
package org.codehaus.groovy.ast;

import java.util.Iterator;
import java.util.List;

import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.stmt.AssertStatement;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.BreakStatement;
import org.codehaus.groovy.ast.stmt.CaseStatement;
import org.codehaus.groovy.ast.stmt.CatchStatement;
import org.codehaus.groovy.ast.stmt.ContinueStatement;
import org.codehaus.groovy.ast.stmt.DoWhileStatement;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.ast.stmt.ForStatement;
import org.codehaus.groovy.ast.stmt.IfStatement;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.ast.stmt.SwitchStatement;
import org.codehaus.groovy.ast.stmt.SynchronizedStatement;
import org.codehaus.groovy.ast.stmt.ThrowStatement;
import org.codehaus.groovy.ast.stmt.TryCatchStatement;
import org.codehaus.groovy.ast.stmt.WhileStatement;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.messages.SyntaxErrorMessage;
import org.codehaus.groovy.syntax.SyntaxException;

public abstract class ClassCodeVisitorSupport extends CodeVisitorSupport implements GroovyClassVisitor {
    
    public void visitClass(ClassNode node) {
        visitAnnotations(node);
        node.visitContents(this);
        List list = node.getObjectInitializerStatements();
        for (Iterator iter = list.iterator(); iter.hasNext();) {
            Statement element = (Statement) iter.next();
            element.visit(this);
        }
    }
    
    public void visitAnnotations(AnnotatedNode node) {
        
    }
    
    protected void visitClassCodeContainer(Statement code) {
        if (code != null) code.visit(this);
    }

    protected void visitConstructorOrMethod(MethodNode node, boolean isConstructor) {
        Statement code = node.getCode();
        visitClassCodeContainer(code);
    }
    
    public void visitConstructor(ConstructorNode node) {
        visitConstructorOrMethod(node,true);        
    }

    public void visitMethod(MethodNode node) {
        visitConstructorOrMethod(node,false);
    }

    public void visitField(FieldNode node) {
        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
    }
    
    public void visitProperty(PropertyNode node) {
        Statement statement = node.getGetterBlock();
        visitClassCodeContainer(statement);
        
        statement = node.getSetterBlock();
        visitClassCodeContainer(statement);
        
        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
    }

    protected void addError(String msg, ASTNode expr) {
        int line = expr.getLineNumber();
        int col = expr.getColumnNumber();
        SourceUnit source = getSourceUnit();
        source.getErrorCollector().addErrorAndContinue(
          new SyntaxErrorMessage(new SyntaxException(msg + '\n', line, col), source)
        );
    }
    
    abstract protected SourceUnit getSourceUnit();
    
    protected void visitStatement(Statement statement) {}
    
    public void visitAssertStatement(AssertStatement statement) {
        visitStatement(statement);
        super.visitAssertStatement(statement);
    }
    
    public void visitBlockStatement(BlockStatement block) {
        visitStatement(block);
        super.visitBlockStatement(block);
    }
    
    public void visitBreakStatement(BreakStatement statement) {
        visitStatement(statement);
        super.visitBreakStatement(statement);
    }
    
    public void visitCaseStatement(CaseStatement statement) {
        visitStatement(statement);
        super.visitCaseStatement(statement);
    }
    
    public void visitCatchStatement(CatchStatement statement) {
        visitStatement(statement);
        super.visitCatchStatement(statement);
    }
    
    public void visitContinueStatement(ContinueStatement statement) {
        visitStatement(statement);
        super.visitContinueStatement(statement);
    }
    
    public void visitDoWhileLoop(DoWhileStatement loop) {
        visitStatement(loop);
        super.visitDoWhileLoop(loop);
    }
    
    public void visitExpressionStatement(ExpressionStatement statement) {
        visitStatement(statement);
        super.visitExpressionStatement(statement);
    }
    
    public void visitForLoop(ForStatement forLoop) {
        visitStatement(forLoop);
        super.visitForLoop(forLoop);
    }
    
    public void visitIfElse(IfStatement ifElse) {
        visitStatement(ifElse);
        super.visitIfElse(ifElse);
    }
    
    public void visitReturnStatement(ReturnStatement statement) {
        visitStatement(statement);
        super.visitReturnStatement(statement);
    }
    
    public void visitSwitch(SwitchStatement statement) {
        visitStatement(statement);
        super.visitSwitch(statement);
    }
    
    public void visitSynchronizedStatement(SynchronizedStatement statement) {
        visitStatement(statement);
        super.visitSynchronizedStatement(statement);
    }
    
    public void visitThrowStatement(ThrowStatement statement) {
        visitStatement(statement);
        super.visitThrowStatement(statement);
    }
    
    public void visitTryCatchFinally(TryCatchStatement statement) {
        visitStatement(statement);
        super.visitTryCatchFinally(statement);
    }
    
    public void visitWhileLoop(WhileStatement loop) {
        visitStatement(loop);
        super.visitWhileLoop(loop);
    }
}