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SPL(Structured Process Language) A programming language specially for structured data computing.
There is a newer version: 20240823
package com.scudata.common;

import java.util.Enumeration;

/**
 * ???????ڲ???ַ?????Ĭ?ϵķָ???Ϊ????
 * ?ָ?ʱ????????˫??????ָ???????????ڵķָ???
 * ?ر?ע?⣺?հ״?????һ????ǣ???ֵҲΪ?հ״?
 * @author RunQian
 *
 */
public final class ArgumentTokenizer implements Enumeration {
	private String str; // Դ??
	private int len; // ????
	private int index; // ??ǰ?ָ??λ??
	private char delim = ','; // ?ָ?????Ĭ??Ϊ????

	private boolean parentheses = false; // ?Ƿ????Բ?????ڵķָ???
	private boolean brackets = false; // ?Ƿ???????????ڵķָ???
	private boolean braces = false; // ?Ƿ???Ի??????ڵķָ???
	private boolean singleQuotation = false; // ?Ƿ???Ե??????ڵķָ???
	
	private boolean count; // ֻȡ????????ȡ?ָ????Ӵ?

	/**
	 * Ϊָ???ַ???????һ???????ָ?????ȱʡ?ָ???Ϊ','??
	 * @param s ָ?????ַ???
	 */
	public ArgumentTokenizer(String s) {
		this(s, ',', false, false, false);
	}

	/**
	 * Ϊָ???ַ???????һ???????ָ???
	 * @param s ָ?????ַ???
	 * @param delim ָ???ķָ???
	 */
	public ArgumentTokenizer(String s, char delim) {
		this(s, delim, false, false, false);
	}

	/**
	 * Ϊָ???ַ???????һ???????ָ???
	 * @param s ָ?????ַ???
	 * @param ignoreParentheses ????Բ?????ڵķָ???
	 * @param ignoreBrackets ???????????ڵķָ???
	 * @param ignoreBraces ???Ի??????ڵķָ???
	 */
	public ArgumentTokenizer(String s, boolean ignoreParentheses,
			boolean ignoreBrackets, boolean ignoreBraces) {
		this(s, ',', ignoreParentheses, ignoreBrackets, ignoreBraces);
	}

	/**
	 * Ϊָ???ַ???????һ???????ָ???
	 * @param s ָ?????ַ???
	 * @param delim ָ???ķָ???
	 * @param ignoreParentheses ????Բ?????ڵķָ???
	 * @param ignoreBrackets ???????????ڵķָ???
	 * @param ignoreBraces ???Ի??????ڵķָ???
	 */
	public ArgumentTokenizer(String s, char delim, boolean ignoreParentheses,
			boolean ignoreBrackets, boolean ignoreBraces) {
		this(s, delim, ignoreParentheses, ignoreBrackets, ignoreBraces, false);
	}

	/**
	 * Ϊָ???ַ???????һ???????ָ???
	 * @param s ָ?????ַ???
	 * @param delim ָ???ķָ???
	 * @param ignoreParentheses ????Բ?????ڵķָ???
	 * @param ignoreBrackets ???????????ڵķָ???
	 * @param ignoreBraces ???Ի??????ڵķָ???
	 * @param ignoreSingleQuotation ???Ե??????ڵķָ???
	 */
	public ArgumentTokenizer(String s, char delim, boolean ignoreParentheses,
			boolean ignoreBrackets, boolean ignoreBraces,
			boolean ignoreSingleQuotation) {
		// str = s.trim();
		str = s;
		this.delim = delim;
		this.parentheses = !ignoreParentheses;
		this.brackets = !ignoreBrackets;
		this.braces = !ignoreBraces;
		this.singleQuotation = !ignoreSingleQuotation;
		len = (str == null || str.length() == 0) ? -1 : str.length();
	}

	/**
	 * ȡ??һ?????
	 * @return ???ַ???Ϊnull???򷵻?null????hasNext()??hasMoreTokens()Ϊ?棬?򷵻?
	 *         ?ָ???ָ?ı??(?ǿմ???մ?)?????򷵻?null?? ????ƥ???????(??/˫)?򷵻????ź???????ַ?
	 *         ??????ǰת???\????????Ų???????????
	 * 
	 */
	public String next() {
		if (str == null || index > len)
			return null;
		int old = index;
		while (index <= len) {
			if (index == len) {
				index++;
				if (len > 1 && str.charAt(len - 1) == delim)
					return count ? null : "";
				break;
			}
			char ch = str.charAt(index);
			if (ch == '\\') {
				index += 2;
				continue;
			}
			if (ch == '\"' || (singleQuotation && ch == '\'')) {
				int tmp = Sentence.scanQuotation(str, index);
				if (tmp < 0) {
					index = len + 1;
					return count ? null : str.substring(old);
				}
				index = tmp + 1;
				continue;
			}
			if (parentheses && ch == '(') {
				int tmp = Sentence.scanParenthesis(str, index);
				if (tmp < 0) {
					index = len + 1;
					return count ? null : str.substring(old);
				}
				index = tmp + 1;
				continue;
			}
			if (brackets && ch == '[') {
				int tmp = Sentence.scanBracket(str, index);
				if (tmp < 0) {
					index = len + 1;
					return count ? null : str.substring(old);
				}
				index = tmp + 1;
				continue;
			}
			if (braces && ch == '{') {
				int tmp = Sentence.scanBrace(str, index);
				if (tmp < 0) {
					index = len + 1;
					return count ? null : str.substring(old);
				}
				index = tmp + 1;
				continue;
			}
			index++;
			if (ch == delim)
				break;
		}
		return count ? null : str.substring(old, index - 1);
	}

	/**
	 * ȡ??һ?????
	 * @return ???ַ???Ϊnull???򷵻?null????hasMoreTokens()Ϊ?棬?򷵻طָ???ָ?
	 *         ?ı??(?ǿմ???մ?)?????򷵻?null??
	 */
	public String nextToken() {
		return next();
	}

	/**
	 * ȡ??һ?????
	 * @return ???ַ???Ϊnull???򷵻?null????hasMoreTokens()Ϊ?棬?򷵻طָ???ָ?
	 *         ?ı??(?ǿմ???մ?)?????򷵻?null??
	 */
	public String nextElement() {
		return next();
	}

	/**
	 * ????ָ???ַ?????????δ???ʱ?ǵĸ?????
	 * @return ?ַ????б????
	 */
	public int countTokens() {
		int j = index;
		count = true;
		int i;
		for (i = 0; index <= len; i++)
			next();

		index = j;
		count = false;
		return i;
	}

	/**
	 * ????Ƿ??б??
	 * @return ???б?Ƿ???true?????򷵻?false
	 */
	public boolean hasNext() {
		return index <= len;
	}

	/**
	 * ????Ƿ??б??
	 * @return ???б?Ƿ???true?????򷵻?false
	 */
	public boolean hasMoreTokens() {
		return hasNext();
	}

	/**
	 * ????Ƿ??б??
	 * @return ???б?Ƿ???true?????򷵻?false
	 */
	public boolean hasMoreElements() {
		return hasNext();
	}
}