package org.lilystudio.smarty4j.statement.modifier;
import java.util.List;
import java.util.regex.Pattern;
import org.lilystudio.smarty4j.Context;
import org.lilystudio.smarty4j.ParseException;
import org.lilystudio.smarty4j.Template;
import org.lilystudio.smarty4j.Utilities;
import org.lilystudio.smarty4j.expression.IExpression;
import org.lilystudio.smarty4j.statement.Modifier;
import org.lilystudio.smarty4j.statement.ParameterCharacter;
/**
* 字符串替换，第一个参数为源字符串，第二个参数为目的字符串。
*
* <pre>
* {"Child's Stool Great for Use in Garden.$"|replace:' ':' '|replace:'$':'$1'}
* </pre>
*
* <b>OUTPUT:</b>
*
* <pre>
* Child's Stool Great for Use in Garden.$1
* </pre>
*
* @version 1.0.0, 2010/10/01
* @author 欧阳先伟
* @since Smarty 1.0
*/
public class $replace extends Modifier {
/** 参数定义 */
private static ParameterCharacter[] definitions = {
new ParameterCharacter(ParameterCharacter.STRING, null),
new ParameterCharacter(ParameterCharacter.STRING, null) };
/** 正则表达式中需要转义的描述正则表达式 */
private static Pattern p = Pattern
.compile("(\\\\|\\{|\\}|\\[|\\]|\\(|\\)|\\*|\\+|\\?|\\^|\\$|\\|)");
/** 正则转换的匹配规则 */
private Pattern rule;
/** 正则转换的替换字符串 */
private String replacement;
@Override
public void init(Template parent, boolean ransack, List<IExpression> values)
throws ParseException {
super.init(parent, ransack, values);
if ((getParameter(0) == null) || (getParameter(1) == null)) {
throw new ParseException("replace参数错误");
}
rule = Pattern.compile(p.matcher(getParameter(0).toString()).replaceAll(
"\\\\$1"));
replacement = Utilities.escapeReg(getParameter(1).toString());
}
@Override
public Object execute(Object obj, Context context, Object[] values) {
return rule.matcher(obj.toString()).replaceAll(replacement);
}
public ParameterCharacter[] getDefinitions() {
return definitions;
}
}