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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.dm;

/**
 * ????????Ŀ?õ?????????ͱ?ʶ??
 * @author WangXiaoJun
 *
 */
public final class KeyWord {
	public static final String SUBCODEBLOCK = "??"; // ?????Ե?ǰ??Ϊ????Ĵ????
	public static final String ARGPREFIX = "?"; // ????ǰ׺??eval?????ı???ʽ???????1???2??????ʽ???ò???
	public static final char OPTION = '@'; // ????ѡ??ָ???

	public static final String CURRENTELEMENT = "~"; // ???е?ǰԪ?ر?ʶ??
	public static final String CURRENTSEQ = "#"; // ???еĵ?ǰѭ?????
	public static final String ITERATEPARAM = "~~"; // ??????????????iterate?????????õ???ֵ
	public static final String FIELDIDPREFIX = "#"; // ??????????ֶ?#1, #2...
	public static final String CURRENTCELL = "@"; // ??ǰ??
	public static final String CURRENTCELLSEQ = "#@"; // ??ǰ??ѭ?????

	public static final char CELLPREFIX = '#'; // #A1 #C ??Ԫ??ǰ׺
	public static final String CONSTSTRINGPREFIX = "'"; // ?????ַ???ǰ׺

	/**
	 * ?ж?ָ???ַ??Ƿ??ǿհ׻?????????ȷ???
	 * @param c ?ַ?
	 * @return true???ǣ?false??????
	 */
	public static boolean isSymbol(char c) {
		return (Character.isWhitespace(c) ||
			c == '+' || c == '-' || c == '*' || c == '/' || c == '%' ||
			c == '=' || c == '&' || c == '|' || c == '!' || c == '\\' ||
			c == ',' || c == '>' || c == '<' || c == '(' || c == ')' ||
			c == '[' || c == ']' || c == ':' || c == '{' || c == '}' ||
			c == '^' || c == '.' || c == '"' || c == '\'' || c == ';');
	}

	/**
	 * ?жϱ?ʶ???Ƿ????Ӵ?????ʶ??
	 * @param id ??ʶ??
	 * @return true???ǣ?false??????
	 */
	public static boolean isSubCodeBlock(String id) {
		return SUBCODEBLOCK.equals(id);
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??????еĵ?ǰԪ??
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isCurrentElement(String id) {
		return CURRENTELEMENT.equals(id);
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??????еĵ?ǰѭ?????
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isCurrentSeq(String id) {
		return CURRENTSEQ.equals(id);
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??ǵ?ǰ??
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isCurrentCell(String id) {
		return CURRENTCELL.equals(id);
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??ǵ?ǰ??ѭ?????
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isCurrentCellSeq(String id) {
		return CURRENTCELLSEQ.equals(id);
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??ǵ???????
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isIterateParam(String id) {
		return ITERATEPARAM.equals(id);
	}

	/**
	 * ?жϱ?ʶ???Ƿ????ֶε???ŷ?????
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isFieldId(String id) {
		if (id == null || id.length() < 2 || !id.startsWith(FIELDIDPREFIX)) {
			return false;
		}
		
		for (int i = 1, len = id.length(); i < len; ++i) {
			char c = id.charAt(i);
			if (c < '0' || c > '9') {
				return false;
			}
		}
		
		return true;
	}
	
	/**
	 * ?жϱ?ʶ???Ƿ??ǵ?ǰ???г?Ա???ã?~n??
	 * @param id ??ʶ
	 * @return true???ǣ?false??????
	 */
	public static boolean isElementId(String id) {
		if (id == null || id.length() < 2 || !id.startsWith(CURRENTELEMENT)) {
			return false;
		}
		
		for (int i = 1, len = id.length(); i < len; ++i) {
			char c = id.charAt(i);
			if (c < '0' || c > '9') {
				return false;
			}
		}
		
		return true;
	}

	/**
	 * ȡ?ֶε???ţ?id??????#1???????ַ???
	 * @param id ?ֶε?#n??ʾ?Ĵ?
	 * @return ?ֶ????
	 */
	public static int getFiledId(String id) {
		return Integer.parseInt(id.substring(FIELDIDPREFIX.length()));
	}

	/**
	 * ?жϱ?ʶ???Ƿ??ǲ???????????????????ã?Ҳ???????1???2????ָ?????õڼ???????
	 * @param id ??ʶ??
	 * @return true???ǣ?false??????
	 */
	public static boolean isArg(String id) {
		if (id == null || !id.startsWith(ARGPREFIX)) {
			return false;
		}
		
		for (int i = 1, len = id.length(); i < len; ++i) {
			char c = id.charAt(i);
			if (c < '0' || c > '9') {
				return false;
			}
		}
		
		return true;
	}
	
	/**
	 * ɨ???ʶ???????ؽ???λ??
	 * @param expStr ????ʽ?ַ???
	 * @param start ??ʼɨ??λ?ã???????
	 * @return int ??ʶ???Ľ???λ?ã?????????
	 */
	public static int scanId(String expStr, int start) {
		int len = expStr.length();
		for (; start < len; ++start) {
			if (isSymbol(expStr.charAt(start))) {
				break;
			}
		}

		return start;
	}

	/**
	 * ???ַ????еĺ???ѡ??ֲ??????Դ?????Ų??ѡ???Ĵ???ѡ????Ϊ????ֵ????
	 * @param strs ?ַ???????
	 * @return ѡ??????
	 */
	public static String[] parseStringOptions(String []strs) {
		int size = strs.length;
		String []opts = new String[size];

		for (int i = 0; i < size; ++i) {
			String tmp = strs[i];
			if (tmp != null) {
				int optIndex = tmp.indexOf(OPTION);
				if (optIndex != -1) {
					strs[i] = tmp.substring(0, optIndex);
					opts[i] = tmp.substring(optIndex + 1);
				}
			}
		}

		return opts;
	}
}