package net.sourceforge.phpdt.sql.parser;

import java.util.Vector;

public class SQLLexx {
	private static String endline = ";";
	private static String dash = "-";
	public static Vector parse(String text) {
		Vector tokens = new Vector();
		StringPointer p = new StringPointer(text);
		try {
			while (!p.isDone()) {
				int offset = p.getOffset();
				char c = p.getNext();
				//System.out.print(c);
				if (Character.isWhitespace(c)) {
					StringBuffer value = new StringBuffer();
					while (Character.isWhitespace(c) && !p.isDone()) {
						value.append(c);
						p.mark();
						c = p.getNext();
					}
					// done because of is done
					if (Character.isWhitespace(c)) {
						value.append(c);
					} else {
						p.reset();
					}
					tokens.addElement(new Token(Token.WHITESPACE, value.toString(), offset, offset + value.length()));
				} else if (Character.isLetter(c) || c == '_') {
					StringBuffer value = new StringBuffer();
					while ((Character.isLetterOrDigit(c) || c == '_') && !p.isDone()) {
						value.append(c);
						p.mark();
						c = p.getNext();
					}
					if ((Character.isLetterOrDigit(c) || c == '_')) {
						value.append(c);
					} else {
						p.reset();
					}
					tokens.addElement(new Token(Token.IDENTIFIER, value.toString(), offset, offset + value.length()));
				} else if (c == '\'') {
					StringBuffer value = new StringBuffer();
					value.append(c);
					if (!p.isDone()) {
						c = p.getNext();
						while (c != '\'' && c != '\n' && !p.isDone()) {
							value.append(c);
							c = p.getNext();
						}
						if (c == '\'' || p.isDone()) {
							value.append(c);
						}
					}
					tokens.addElement(new Token(Token.LITERAL, value.toString(), offset, offset + value.length()));
				} else if (c == '-') {
					p.mark();
					if (p.isDone()) {
						tokens.addElement(new Token(Token.SYMBOL, dash, offset, offset + 1));
					} else {
						char next = p.getNext();
						if (next == '-') {
							StringBuffer value = new StringBuffer("--");
							if (!p.isDone()) {
								c = p.getNext();
								while (c != '\n' && !p.isDone()) {
									value.append(c);
									c = p.getNext();
								}
								if (p.isDone()) {
									value.append(c);
								}
							}
							tokens.addElement(new Token(Token.COMMENT, value.toString(), offset, offset + value.length()));
						} else {
							tokens.addElement(new Token(Token.SYMBOL, dash, offset, offset + 1));
							p.reset();
						}
					}
				} else if (c == ';') {
					tokens.addElement(new Token(Token.SEPARATOR, endline, offset, offset + 1));
					StringBuffer value = new StringBuffer();
					if (!p.isDone()) {
						c = p.getNext();
						while (c != '\n' && !p.isDone()) {
							value.append(c);
							c = p.getNext();
						}
						if (p.isDone()) {
							value.append(c);
						}
						offset++;
						tokens.addElement(new Token(Token.COMMENT, value.toString(), offset, offset + value.length()));
					}
				} else if (Character.isDigit(c)) {
					StringBuffer value = new StringBuffer();
					while ((Character.isDigit(c) || c == '.') && !p.isDone()) {
						value.append(c);
						p.mark();
						c = p.getNext();
					}
					if ((Character.isDigit(c) || c == '.')) {
						value.append(c);
					} else {
						p.reset();
					}
					tokens.addElement(new Token(Token.NUMERIC, value.toString(), offset, offset + value.length()));
				} else {
					tokens.addElement(new Token(Token.SYMBOL, new String(new char[] {c}), offset, offset + 1));
				}
			}
		} catch (RuntimeException e) {
			e.printStackTrace();
		}
		
		//System.out.println("-------------------");
		//for (int i = 0; i < tokens.size(); i++) {
		//	System.out.println((Token) tokens.elementAt(i));
		//}
		return tokens;
	}
}