import java.util.StringTokenizer;
abstract class Statement implements Executable
{
 static Statement parse(String statementText) throws SyntaxException 
 {
 int index = statementText.indexOf('=');
 if(index < 0) {
 int value;
 try {
 value = Integer.parseInt(statementText);
 return new SetKStatement(value);
 } 
 catch(NumberFormatException e) {
 return new InvokeStatement(statementText);
 }
 }
 else {
 String lhs = statementText.substring(0, index).trim();
 String rhs = statementText.substring(index+1).trim();
 return new AssignStatement(lhs,rhs);
 }
 }
 abstract String show();
 public abstract void exec(Calc c) throws ExecutionException;
}
class SetKStatement extends Statement
{
 int value;
 SetKStatement(int _value) { value = _value; }
 String show() {
 return "Change K to " + value;
 }
 public void exec(Calc c) throws ExecutionException {
 c.setK(value);
 }
}
class InvokeStatement extends Statement
{
 String executableName;
 InvokeStatement(String executableName) 
 {
 this.executableName = executableName;
 }
 String show() 
 { 
 return "Invoke program " + executableName; 
 }
 public void exec(Calc calc) throws ExecutionException 
 {
 calc.lookupExecutable(executableName).exec(calc);
 }
}
class AssignStatement extends Statement
{
 String lhs;
 Expression rhs;
 AssignStatement(String lhs, String rhs) throws SyntaxException 
 {
 this.lhs = lhs;
 this.rhs = Expression.parse(rhs);
 }
 String show()
 {
 return lhs + " gets " + rhs.show();
 }
 public void exec(Calc calc) throws ExecutionException
 {
 calc.bindVariable(lhs, rhs.eval(calc));
 }
}
</div><div class="naked_ctrl">
<form action="/index.cgi/larger-text" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="http://chu.stanford.edu/source/Statement.java">(-&gt;オリジナル)</a>
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<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text" selected="selected">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>