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sqlscanner.cpp
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1316 lines (1179 loc) · 38.6 KB
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#include "sqlscanner.h"
#include <QtDebug>
SqlScanner::SqlScanner()
{
init_keywords();
}
void SqlScanner::reset()
{
state = ScanPrepair;
//清空输出单词表
QVector<SqliteToken*>::iterator iter = token_table.begin();
for(;iter!=token_table.end();++iter)
{
delete (*iter);
}
token_table.clear();
}
void SqlScanner::init_keywords()
{
keywords.insert(QString("char"),TokenChar);
keywords.insert(QString("varchar"),TokenVarchar);
keywords.insert(QString("text"),TokenText);
keywords.insert(QString("blob"),TokenBlob);
keywords.insert(QString("int"),TokenInt);
keywords.insert(QString("float"),TokenFloat);
keywords.insert(QString("decimal"),TokenDecimal);
keywords.insert(QString("datetime"),TokenDateTime);
keywords.insert(QString("create"),TokenCreate);
keywords.insert(QString("temp"),TokenTemp);
keywords.insert(QString("temporary"),TokenTemp);
keywords.insert(QString("table"),TokenTable);
keywords.insert(QString("if"),TokenIf);
keywords.insert(QString("not"),TokenNot);
keywords.insert(QString("exists"),TokenExists);
keywords.insert(QString("null"),TokenNull);
keywords.insert(QString("primary"),TokenPrimary);
keywords.insert(QString("key"),TokenKey);
keywords.insert(QString("autoincrement"),TokenAutoIncrement);
keywords.insert(QString("unique"),TokenUnique);
keywords.insert(QString("check"),TokenCheck);
keywords.insert(QString("default"),TokenDefault);
keywords.insert(QString("collate"),TokenCollate);
keywords.insert(QString("on"),TokenOn);
keywords.insert(QString("conflict"),TokenConflict);
keywords.insert(QString("escapte"),TokenEscape);
keywords.insert(QString("isnull"),TokenIsNull);
keywords.insert(QString("notnull"),TokenNotNull);
keywords.insert(QString("between"),TokenBetween);
keywords.insert(QString("case"),TokenCase);
keywords.insert(QString("when"),TokenWhen);
keywords.insert(QString("then"),TokenThen);
keywords.insert(QString("else"),TokenElse);
keywords.insert(QString("end"),TokenEnd);
keywords.insert(QString("cast"),TokenCast);
keywords.insert(QString("as"),TokenAs);
keywords.insert(QString("in"),TokenIn);
keywords.insert(QString("and"),TokenAnd);
keywords.insert(QString("or"),TokenOr);
keywords.insert(QString("index"),TokenIndex);
keywords.insert(QString("asc"),TokenAsc);
keywords.insert(QString("desc"),TokenDesc);
keywords.insert(QString("trigger"),TokenTrigger);
keywords.insert(QString("before"),TokenBefore);
keywords.insert(QString("after"),TokenAfter);
keywords.insert(QString("instead"),TokenInstead);
keywords.insert(QString("of"),TokenOf);
keywords.insert(QString("for"),TokenFor);
keywords.insert(QString("each"),TokenEach);
keywords.insert(QString("row"),TokenRow);
keywords.insert(QString("statement"),TokenStatement);
keywords.insert(QString("begin"),TokenBegin);
keywords.insert(QString("end"),TokenEnd);
}
SqliteTokenEnum SqlScanner::getIDToken(const QString &value)
{
QString key(value);
key = key.trimmed().toLower();
if(keywords.contains(key)){
return keywords[key];
}else{
return TokenID;
}
}
bool SqlScanner::isAccept(QChar ch)
{
//用户通过键盘输入的特殊但却是不可接受的字符。这个很难列全，因为用一些特殊的输入工具
//可以输入大量的特殊符号
if(ch=='@'||ch=='#'||ch=='$'
||ch=='^'||ch=='{'||ch=='}'
||ch=='\\'||ch==':'||ch==';'
||ch=='~'||ch=='_')
return true;
else
return false;
}
bool SqlScanner::scan(const QString &src)
{
sourceSql = src;
qDebug()<<src;
//复位扫描器:
reset();
int index=0;
int count = sourceSql.count();
QChar temp = sourceSql.at(index);
QChar prev;
SqliteToken *token=0;
bool error_flag = false;
bool eof = false;
//不做错误处理，遇到错误就直接退出
while(true){
eof = (index>=count);
if(eof)break;
prev = sourceSql.at(index);
index ++;
temp = prev;
//qDebug("%c %d",temp.unicode());
//qDebug()<<temp<<"-"<<temp.unicode();
PREPAIR:
if(state == ScanPrepair)
{
if(eof){
break;
}
else if(temp == ' ')
{
continue;
}
else if(temp == '0')
{
state = ScanZero;
token = new SqliteToken();
token->id = TokenIntConst;
token->value.push_back(temp);
}
else if(temp >'0' && temp <='9')
{
state = ScanInt;
token = new SqliteToken();
token->id = TokenIntConst;
token->value.push_back(temp);
}
else if(temp.isLetter())
{
state = ScanID;
token = new SqliteToken();
token->id = TokenID;
token->value.push_back(temp);
}
else if(temp == '\"')
{
state = ScanString;
token = new SqliteToken();
token->id = TokenID;
//token->value.push_back(temp);
}
else if(temp == '\'')
{
state = ScanChar;
token = new SqliteToken();
token->value.push_back(temp);
token->id = TokenChar;
}
else if(temp == '(' )
{
token = new SqliteToken();
token->id = TokenLeft;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == ')' )
{
token = new SqliteToken();
token->id = TokenRight;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '[' )
{
state = ScanKeyID;
token = new SqliteToken();
token->id = TokenID;
}
else if(temp == '+')
{
token = new SqliteToken();
token->id = TokenAdd;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '-')
{
token = new SqliteToken();
token->id = TokenSub;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '*')
{
token = new SqliteToken();
token->id = TokenMul;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '/')
{
token = new SqliteToken();
token->id = TokenDiv;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '%')
{
token = new SqliteToken();
token->id = TokenMod;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '&')
{
token = new SqliteToken();
token->id = TokenBitAnd;
token->value.push_back(temp);
token_table.push_back(token);
}
else if(temp == '|')
{
state = ScanConnect;
token = new SqliteToken();
token->id = TokenBitOr;
token->value.push_back(temp);
}
else if(temp == '<')
{
state = ScanLess;
token = new SqliteToken();
token->id = TokenLess;
token->value.push_back(temp);
}
else if(temp == '>')
{
state = ScanMore;
token = new SqliteToken();
token->id = TokenMore;
token->value.push_back(temp);
}
else if(temp == '!')
{
state = ScanNot;
token = new SqliteToken();
token->id = TokenLogicNot;
token->value.push_back(temp);
}
else if(temp == '~')
{
token = new SqliteToken();
token->id = TokenBitNot;
token->value.push_back(temp);;
}
else if(temp == '=')
{
state = ScanEqual;
token = new SqliteToken();
token->id = TokenEqual;
token->value.push_back(temp);
}
else if(temp == ',')
{
token = new SqliteToken();
token->id = TokenComma;
token->value.push_back(temp);
token_table.push_back(token);
}
else{
error_flag = true;
break;
}
}
else if(state == ScanID)
{
if(eof)
{
token->id = getIDToken(token->value);
token_table.push_back(token);
state = ScanEOF;
break;
}
else if(temp == ' ')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp >='0' && temp <='9')
{
token->value.push_back(temp);
}
else if(temp.isLetter())
{
token->value.push_back(temp);
}
else if(temp == '_'){
token->value.push_back(temp);
}
else if(temp == '\"' )
{
token_table.push_back(token);
token->id = getIDToken(token->value);
state = ScanString;
token = new SqliteToken();
token->id = TokenID;
}
else if(temp == '\'')
{
token_table.push_back(token);
token->id = getIDToken(token->value);
state = ScanChar;
token = new SqliteToken();
token->value.push_back(temp);
token->id = TokenChar;
}
else if(temp == '.')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMember;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '(' )
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLeft;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ')' )
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenRight;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '[' )
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();;
state = ScanKeyID;
token->id = TokenID;
}
else if(temp == '+')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenAdd;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '-')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenSub;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '*')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMul;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '/')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenDiv;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '%')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMod;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '&')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitAnd;
token->value.push_back(temp);
state = ScanPrepair;
}
else if(temp == '|')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitOr;
token->value.push_back(temp);
state = ScanConnect;
}
else if(temp == '<')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLess;
token->value.push_back(temp);
state = ScanLess;
}
else if(temp == '>')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMore;
token->value.push_back(temp);
state = ScanMore;
}
else if(temp == '=')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenEqual;
token->value.push_back(temp);
state = ScanEqual;
}
else if(temp == '!')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLogicNot;
token->value.push_back(temp);
state = ScanNot;
}
else if(temp == '~')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitNot;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ',')
{
token->id = getIDToken(token->value);
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenComma;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else
{
token->value.push_back(temp);
//error_flag = true;
//break;
}
}
else if(state == ScanZero)
{
if(eof)
{
token_table.push_back(token);
state = ScanEOF;
break;
}
else if(temp == ' ')
{
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '(')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLeft;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ')')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenRight;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ',')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenComma;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '+')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenAdd;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '-')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenSub;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '*')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMul;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '/')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenDiv;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '%')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMod;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '>')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMore;
token->value.push_back(temp);
state = ScanMore;
}
else if(temp == '<')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLess;
token->value.push_back(temp);
state = ScanLess;
}
else if(temp == '=')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenEqual;
token->value.push_back(temp);
state = ScanEqual;
}
else if(temp == '!')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLogicNot;
token->value.push_back(temp);
state = ScanNot;
}
else if(temp == '~')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitNot;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '&')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitAnd;
token->value.push_back(temp);
state = ScanPrepair;
}
else if(temp == '|')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitOr;
token->value.push_back(temp);
state = ScanConnect;
}
else if(temp == '.')
{
state = ScanIntDot;
token->id = TokenFloatConst;
token->value.push_back(temp);
}
else
{
error_flag = true;
break;
}
}
else if(state == ScanInt)
{
if(eof)
{
token_table.push_back(token);
state = ScanEOF;
break;
}
else if(temp == ' ')
{
state = ScanPrepair;
token_table.push_back(token);
}
else if(temp >='0' && temp <='9')
{
token->value.push_back(temp);
}
else if(temp == '(')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLeft;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ')')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenRight;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '+')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenAdd;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '-')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenSub;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '*')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMul;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '/')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenDiv;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '%')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMod;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '>')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMore;
token->value.push_back(temp);
state = ScanMore;
}
else if(temp == '<')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLess;
token->value.push_back(temp);
state = ScanLess;
}
else if(temp == '=')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenEqual;
token->value.push_back(temp);
state = ScanEqual;
}
else if(temp == '!')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLogicNot;
token->value.push_back(temp);
state = ScanNot;
}
else if(temp == '~')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitNot;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '&')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitAnd;
token->value.push_back(temp);
state = ScanPrepair;
}
else if(temp == '|')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenBitOr;
token->value.push_back(temp);
state = ScanConnect;
}
else if(temp == '.')
{
state = ScanIntDot;
token->id = TokenFloatConst;
token->value.push_back(temp);
}
else
{
error_flag = true;
break;
}
}
else if(state == ScanIntDot)
{
if(temp >= '0' && temp <='9')
{
state = ScanReal;
token->id = TokenFloat;
token->value.push_back(temp);
}
else
{
error_flag = true;
break;
}
}
else if (state == ScanReal)
{
if(eof)
{
token_table.push_back(token);
state = ScanEOF;
break;
}
else if(temp == '(')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenLeft;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == ')')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenRight;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '+')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenAdd;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '-')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenSub;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '*')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMul;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '/')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenDiv;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '%')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMod;
token->value.push_back(temp);
token_table.push_back(token);
state = ScanPrepair;
}
else if(temp == '>')
{
token_table.push_back(token);
token = new SqliteToken();
token->id = TokenMore;
token->value.push_back(temp);
state = ScanMore;
}
else if(temp == '<')
{