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DarkSide SQL Mini Version 1, The embedded database

, 23 Mar 2006 BSD
An embedded database library in C++.
/**
Copyright 2000 - 2003 LogicMatrix. All rights reserved. 

This software is distributed under the LogicMatrix Free Software License. This software may be used for any purpose, personal or commercial. Redistributions in binary /source code form are permitted. Commercial redistribution of larger works derived from, or works which bundle this software requires a "Commercial Redistribution License" which can be purchased from LogicMatrix. Contact LogicMatrix for details

Redistributions qualify as Free and non-commercial under one of the following terms:

1) Redistributions are made at no charge beyond the reasonable cost of materials and delivery.
2) Redistributions in binary/source code form must reproduce this Copyright Notice,these license terms, and the disclaimer/limitation of liability set forth as below, in the documentation and/or other materials
provided with the distribution.

Disclaimer
==========
The Software is provided on an "AS IS" basis. No warranty is
provided that the Software is free of defects, or fit for a
particular purpose. 

Limitation of Liability 
=======================
LogicMatrix shall not be liable for any damages suffered by the Licensee or any third party resulting from use of the Software.


**/

/**
	sql_lexer.cpp

	Purpose: Defines a lexer for sql commands

	Author: Vijay Mathew Pandyalakal
	Date:	14/11/2003
	Copyright: logicmatrix
**/

#include <string>
#include <vector>
#include <iostream>
using namespace std;

#include "mydate.h"
using namespace openutils;

#include "dsql_m_structs.h"
#include "text.h"
#include "sql_lexer.h"
using namespace dsqlm;

SQLLexer::SQLLexer(const char* sql) {
	this->sql = sql;
}

void SQLLexer::setSql(const char* sql) {
	this->sql = sql;
}

string SQLLexer::getSql() {
	return sql;
}

vector<string> SQLLexer::tokenize() {
	vector<string> ret;
	int len = sql.length();
	string tmp = "";
	char c = ' ';
	char pc = ' ';
	bool in_chords = false;
	/*char* buff = new char[len+1];
	strcpy(buff,sql.c_str());
	sql = "";*/
	for(int i=0;i<len;i++) {
		c = sql[i];
		if(c == '>' || c == '<') {
			if(!in_chords) {
				if(i == (len-1)) {
					throw DsqlMException("Invalid use of >");
				}else {
					char next = sql[i+1];
					if(next == '=' || next == '>') {
						ret.push_back(tmp);
						tmp = "";
						tmp += c;
						tmp += next;
						ret.push_back(tmp);
						tmp = "";
						i++;
						continue;
					}
				}
			}
		}
		if(isBreakableToken(i)) {
			if(in_chords) {
				tmp += c;
			}else {
				ret.push_back(tmp);
				tmp = "";
				if(c != ' ') {
					tmp += c;
					ret.push_back(tmp);
					tmp = "";
				}				
			}
		}else if(c == '(' || c== ')' || c == ',') {
			if(in_chords) {
				tmp += c;
			}else {
				ret.push_back(tmp);
				tmp = "";
				tmp += c;
				ret.push_back(tmp);
				tmp = "";				
			}
		}else if(c == '\'' || c == '\"') {
			if(in_chords) {
				if(pc == '\\') {
					tmp += c;
				}else {
					tmp += c;
					ret.push_back(tmp);
					tmp = "";
					in_chords = false;
				}
			}else {
				ret.push_back(tmp);
				tmp = "";
				tmp += c;
				in_chords = true;
			}
		}else if(c == '\\') {
			if(!in_chords) {				
				tmp += c;
			}
		}else {
			tmp += c;			
		}
		pc = c;
	}
	/*sql = buff;
	delete[] buff;*/
	if(tmp != "") {
		ret.push_back(tmp);
	}
	ret = trim(ret);
	return ret;
}

vector<string> SQLLexer::trim(vector<string> vct) {
	int sz = vct.size();
	vector<string> ret;
	string s = "";
	Text text;
	for(int i=0;i<sz;i++) {
		s = vct[i];
		s = text.trim(s);
		if(s == "") continue;		
		ret.push_back(s);
	}
	return ret;
}

void SQLLexer::printTokens(vector<string> vct) {
	for(int i=0;i<vct.size();i++) {
		cout << vct[i] << endl;
	}
}

bool SQLLexer::isBreakableToken(int i) {
	char curr = sql[i];
	if(i >= sql.size()) {
		return false;
	}
	if(curr == ' ') return true;
	if(curr == '=') return true;	
	if(curr == '<') return true;	
	if(curr == '>') return true;	
	return false;
}


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This article, along with any associated source code and files, is licensed under The BSD License

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