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lexerimp.cpp
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lexerimp.cpp
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#include "lexerimp.h"
#include <QDebug>
LexerImp::LexerImp()
{
}
bool LexerImp::isKeyWord(QString str){
//判断字符串是否为关键字
if(ConstantVar::reservedWords.contains(str)){
return true;
}
return false;
}
LexType LexerImp::getLexType(QString str){
QMap<LexType, QString>::const_iterator it_1;
QMap<QString, LexType>::const_iterator it_2;
//保留字迭代器
for (it_1 = ConstantVar::lexName.constBegin();
it_1 != ConstantVar::lexName.constEnd(); ++it_1) {
if(str == it_1.value()){
return it_1.key();
}
}
for (it_2 = ConstantVar::reservedWords.constBegin();
it_2 != ConstantVar::reservedWords.constEnd(); ++it_2) {
if(str == it_2.key()){
return it_2.value();
}
}
}
TokenList* LexerImp::appendTokenList(TokenList* tokenlist, int _lineShow, LexType _lex, QString _sem){
Token token(_lineShow, _lex, _sem);
tokenlist->append(token);
QString lexStr = ConstantVar::lexName[token.getLexType()];
return tokenlist;
//栈区读入元素,当栈区清空时,导致tokenlist出现错误
}
QString LexerImp::stackToString(QStack<QChar> charStack){
QString str = "";
while(!charStack.isEmpty()){
str += charStack.front();
charStack.pop_front();
}
return str;
}
int LexerImp::getCharType(QChar c){
if((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")){
//判断标识符和关键字
return 1;
}
if(c >= "0" && c <= "9"){
return 2;
}
if(c == "=" || c == "<" || c == "+" || c == "-"
|| c == "*" || c == "/" || c == "(" || c == ")"
|| c == ";" || c == "," || c == "[" || c == "]"){
return 3;
}
if(c == "."){
return 4;
}
if(c == ":"){
return 5;
}
if(c == "\n"){
return 6;
}
return 0;
}
QList<QString> LexerImp::pushString(QList<QString> strQueue, QString str){
QString _str = str;
strQueue.push_back(str);
//qDebug() << str;
return strQueue;
}
TokenList* LexerImp::queueToList(TokenList* tokenList, QList<QString> strQueue){
int lineShow = 1;
while (!strQueue.isEmpty()) {
//qDebug() << strQueue.front();
if(getCharType(strQueue.front()[0]) == 1){
if(isKeyWord(strQueue.front())){
tokenList = appendTokenList(tokenList, lineShow, getLexType(strQueue.front()), "-1");
}else {
tokenList = appendTokenList(tokenList, lineShow, getLexType("ID"), strQueue.front());
}
}
if(getCharType(strQueue.front()[0]) == 2){
tokenList = appendTokenList(tokenList, lineShow, getLexType("INTC_VAL"), strQueue.front());
}
if(getCharType(strQueue.front()[0]) == 3
|| (getCharType(strQueue.front()[0]) == 4 && strQueue.front().size() == 1)
|| (getCharType(strQueue.front()[0]) == 5 && getCharType(strQueue.front() != ":="))){
tokenList = appendTokenList(tokenList, lineShow, getLexType(strQueue.front()), "-1");
}
if(strQueue.front() == ".." || strQueue.front() == ":="){
//qDebug() << "***" <<strQueue.front();
tokenList = appendTokenList(tokenList, lineShow, getLexType(strQueue.front()), "-1");
}
if(getCharType(strQueue.front()[0]) == 6)lineShow++;
strQueue.pop_front();
}
return tokenList;
}
TokenList* LexerImp::run1(QString str){
TokenList* tokenList = new TokenList();
/* 在下边实现 */
int lineShow = 1;
int strp = 0;//str的下标
QString temp;//记录保留字或者变量
QChar c;
while(strp < str.length()){
if((str[strp] >= "a" && str[strp] <= "z")
|| (str[strp] >= "A" && str[strp] <= "Z")){
//判断标识符和关键字
temp += str[strp];
strp++;
while(((str[strp] >= "a" && str[strp] <= "z")
|| (str[strp] >= "A" && str[strp] <= "Z")
|| (str[strp] >= "0" && str[strp] <= "9")) && strp < str.length()){
temp += str[strp];
strp++;
}
if (isKeyWord(temp)) {
tokenList = appendTokenList(tokenList, lineShow, getLexType(temp), "-1");
}else {
tokenList = appendTokenList(tokenList, lineShow, getLexType("ID"), temp);
}
temp = "";
continue;
}
if(str[strp] >= "0" && str[strp] <= "9"){
temp += str[strp];
strp++;
while((str[strp] >= "0" && str[strp] <= "9") && strp < str.length()){
temp += str[strp];
strp++;
}
tokenList = appendTokenList(tokenList, lineShow, getLexType("INTC_VAL"), temp);
temp = "";
continue;
}
if(str[strp] == "="){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "<"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "+"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "-"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "*"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "/"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "("){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == ")"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "."){
if(str + 1 < str.length())
if(str[strp + 1] == "." && str + 1 < str.length()){
tokenList = appendTokenList(tokenList, lineShow, getLexType(".."), "-1");
strp += 2;
continue;
}
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == ":"){
if(strp + 1 < str.length())
if(str[strp + 1] == "="){
tokenList = appendTokenList(tokenList, lineShow, getLexType(":="), "-1");
strp += 2;
continue;
}
tokenList = appendTokenList(tokenList, lineShow, getLexType("COLON"), "-1");
strp++;
continue;
}
if(str[strp] == ";"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == ","){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "["){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "]"){
c = str[strp];
tokenList = appendTokenList(tokenList, lineShow, getLexType(c), "-1");
strp++;
continue;
}
if(str[strp] == "\n"){
lineShow++;
strp++;
continue;
}
strp++;
}
return tokenList;
}
//state状态:1,9标识符状态
// 2,10数字状态
// 3(单分界符)完成状态
// 4(“.”)单分界符
// 5(“:”)单分界符
// 6(“..”)数组下标界限状态
// 7(“\n”)换行
// 8(“:=”)赋值状态
// 9结束状态
TokenList* LexerImp::run(QString str)
{
TokenList* tokenList = new TokenList();
QList<QString> strQuene;
QStack<QChar> charStack; //记录保留字或者变量
QString temp, TEST;
QChar c ,next;
int strp = 0; //str的下标
int state = 0; //自动机状态
while(strp < str.length()){
c = str[strp];
if( strp + 1 >= str.length()){
next = '\0';
}
else {
next = str[strp + 1];
}
charStack.push(c);
switch (state) {
case 0 :
switch (getCharType(c)) {
case 1 : state = 1; break;//字符型
case 2 : state = 2; break;//数字型
case 3 : state = 3; break;//单分隔符
case 4 : state = 4; break;//“.”
case 5 : state = 5; break;//“:”
case 6 : state = 6; break;//“\n”
default: goto LS1;
}
break;
case 1 :
switch (getCharType(next)) {
case 1 : state = 1; break;//字符型
case 2 : state = 1; break;//字符型
default: goto LS1;
}break;
case 2 :
switch (getCharType(next)) {
case 1 : qDebug() << "ERROR: Nonstandard identifier!";break;
case 2 : state = 2; break;//数字型
default: goto LS1;
}break;
case 3 : goto LS1;
case 4 :
switch (getCharType(next)) {
case 4 : state = 7; break;//“..”
default: goto LS1;//“”
}break;
case 5 :
switch (getCharType(next)) {
case 3 : if(next == "=")state = 8; break;//“:=”
default: goto LS1;
}break;
//判断:“:=”和“:”
case 6 : goto LS1;
case 7 : goto LS1;
//判断:“..”和“.”
case 8 : goto LS1;
LS1:
case 9 :
temp = stackToString(charStack);
charStack.clear();
//qDebug() << temp;
strQuene = pushString(strQuene,temp);
temp = "";
switch (getCharType(next)) {
case 1 : state = 1; break;//字符型
case 2 : state = 2; break;//数字型
case 3 : state = 3; break;//单分隔符
case 4 : state = 4; break;//“.”
case 5 : state = 5; break;//“:”
case 6 : state = 6; break;//“\n”
default: state = 9;
}
break;
}
strp++;
}
tokenList = queueToList(tokenList, strQuene);
return tokenList;
}