org.xidea.lite.EncodePlugin Maven / Gradle / Ivy

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Javascript Styled Expression Engine
There is a newer version: 3.1.15
package org.xidea.lite;

import java.io.IOException;
import java.util.Map;

import org.xidea.el.Expression;

/**
 * 自定义函数和扩展函数（Invocable接口类）
 * 
 * @author jindw
 */
public class EncodePlugin implements RuntimePlugin {
//	private static Log log = LogFactory.getLog(EncodePlugin.class);
	private Expression el;

	public void initialize(Template template, Object[] children) {
		this.el = (Expression) ((Object[]) children[0])[1];
	}

	public void execute(Map context, Appendable out) throws IOException {
		Object value = el.evaluate(context);
		if (value instanceof Number) {
			if (((Number) value).floatValue() == 0) {
				out.append('0');
				return;
			}
		}
		final String text = String.valueOf(value);

		for (int i = 0, len = text.length(); i < len; i++) {
			int c = text.charAt(i);
			switch (c) {
			case '<':
				out.append("<");// 60
				break;
			case '"':// 34
				out.append(""");
				break;
			case '\'':// 39
				out.append("'");
				break;
			case '&':// 38
				if (notEntity(text, i, len)) {
					out.append("&");
					break;
				}
			default:
				out.append((char)c);
			}
		}
	}

	private boolean notEntity(String text, int i, int len) {
		int status = 0;
		while (++i < len) {
			int c = text.charAt(i);
			switch (status) {
			case 0:
				if (c == '#') {
					// �x12df;
					// 〷
					status = 2;
				} else if (Character.isJavaIdentifierStart(c) && c != '$') {
					status = 1;
				} else {
					return true;
				}
				break;
			case 1:// 实体有值&a
				if (!Character.isJavaIdentifierPart(c) && c != '$' || c == '.'
						|| c == '-') {// 有改进空间（xml entity支持 '.'）
					return c != ';';
				}
				break;
			case 2:// 字符引用&#
				if (c == 'x') {
					status = 21;
				} else if (c >= '0' && c <= '9') {
					status = 20;
				} else {
					return true;
				}
				break;
			case 20:// 十进制字符实体有值: 
				if (c >= '0' && c <= '9') {
				} else {
					return c != ';';
				}
				break;
			case 21:// 十六进制字符引用 &#x
				if (c >= '0' && c <= '9' || c >= 'a' && c <= 'f' || c >= 'A'
						&& c <= 'F') {
					status = 22;
				} else {
					return true;
				}
				break;
			case 22:// 十六进制字符引用 

				if (c >= '0' && c <= '9' || c >= 'a' && c <= 'f' || c >= 'A'
						&& c <= 'F') {
				} else {
					return c != ';';
				}
				break;
			default:
				return true;
			}

		}
		return true;
	}
}