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Nasal-Interpreter
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bugs fixed

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Valk Richard Li 2019-07-29 21:46:55 +08:00 committed by GitHub
parent bfddeeaa9e
commit 8554ffd7fb
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1 changed files with 104 additions and 52 deletions
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156
lexical_analysis.cpp
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@ -2,34 +2,36 @@
#include <fstream>
#include <cstring>
#define IDENTR -1 //界符 or 运算符
#define NUMBER -2 //数字
#define RESERV -3 //关键字
#define FAIL -4
#define SCANEND -5
#define ERROROCC -6
#define SELFD -7 //自定义标识符
#define SELFDEFINE -1 //自定义标识符
#define IDENTIFIER -2 //界符 or 运算符
#define NUMBER -3 //数字
#define RESERVEWORD -4//关键字
#define FAIL -5 //失败
#define SCANEND -6 //扫描完成
#define ERRORFOUND -7 //异常错误
// \n 换行
// \t tab
// \r 回车
// \\ 反斜线
// \' 单引号
// \" 双引号
std::string ReserveWord[25]=
std::string ReserveWord[27]=
{
"for","foreach","forindex","while",
"var","func","break","continue","return",
"if","else","elsif","nil","and","or",
"print","cmp","append","setsize","subvec","pop",
"sort","contains","delete","keys"
"sort","contains","delete","keys","typeof","id"
};
std::string OperatorOrDelimiter[33]=
std::string OperatorOrDelimiter[40]=
{
"+","-","*","/","=","+=","-=","*=","/=",
"\n","\t","\r","\\","\'","\"",".",
"<","<=",">",">=","==","!=","!","~",
",",";","(",")","[","]","{","}","#"
"<","<=",">",">=","==","!=","~=","!","~",
",",";","(",")","[","]","{","}","#","?",":",
"&","|","%","^"
};
std::string IdentifierTable[1000]={""};
@ -37,7 +39,7 @@ char ResourcePrograme[16384];
int isReserveWord(std::string &p)
{
for(int i=0;i<25;++i)
for(int i=0;i<27;++i)
if(ReserveWord[i]==p)
return i+1;
return FAIL;
@ -45,7 +47,7 @@ int isReserveWord(std::string &p)
int isOperatorOrDelimiter(std::string &p)
{
for(int i=0;i<33;++i)
for(int i=0;i<40;++i)
if(OperatorOrDelimiter[i]==p)
return i+1;
return FAIL;
@ -61,9 +63,16 @@ bool isNumber(char t)
return ('0'<=t && t<='9');
}
void InputFile(const char *FileName)
void InputFile(std::string &FileName)
{
std::ifstream fin(FileName);
if(fin.fail())
{
std::cout<<"[Error] Failed to load file: "<<FileName<<std::endl;
ResourcePrograme[0]='@';
fin.close();
return;
}
int i=0;
bool FindNote=false;
while(!fin.eof())
@ -93,19 +102,19 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
{
char temp;
temp=Source[ptr];
while(temp==' ' || temp=='\n')
while(temp==' ' || temp=='\n' || temp=='\t' || temp=='\r' || temp<0 || temp>127)
{
++ptr;
temp=Source[ptr];
}
token="";
if(isLetter(temp))
if(isLetter(temp) || temp=='_')
{
token+=temp;
++ptr;
temp=Source[ptr];
while(isLetter(temp) || isNumber(temp) || temp==':' || temp=='?' || temp=='`' || temp=='.')
while(isLetter(temp) || isNumber(temp) || temp=='_')
{
token+=temp;
++ptr;
@ -113,40 +122,50 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
}
Syn=isReserveWord(token);
if(Syn==FAIL)
Syn=SELFD;
Syn=SELFDEFINE;
else
Syn=RESERV;
Syn=RESERVEWORD;
}
else if(isNumber(temp))
{
int PointCnt=0;
token+=temp;
++ptr;
temp=Source[ptr];
while(isNumber(temp))
{
token+=temp;
++ptr;
temp=Source[ptr];
if(temp=='.')
if(temp=='.' && !PointCnt)
{
++PointCnt;
else if(temp!='.' && !isNumber(temp))
break;
if(PointCnt>1)
break;
token+=temp;
++ptr;
temp=Source[ptr];
}
}
Syn=NUMBER;
}
else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' || temp=='}' || temp=='~' || temp==',' || temp==';' || temp=='\"')
else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
temp=='}' || temp==',' || temp==';' || temp=='\"' || temp==':' ||
temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&' ||
temp=='|')
{
token+=temp;
++ptr;
Syn=IDENTR;
Syn=IDENTIFIER;
}
else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' ||
temp=='/' || temp=='=' || temp=='\\' || temp=='.' || temp=='<' ||
temp=='>'
)
else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
{
Syn=IDENTIFIER;
token+=temp;
++ptr;
temp=Source[ptr];
if(temp=='=')
{
token+=temp;
++ptr;
}
}
else if(temp=='\\')
{
/*
"+","-","*","/","=","+=","-=","*=","/=",
@ -154,7 +173,7 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
"<","<=",">",">=","==","!=","!","~",
",",";","(",")","[","]","{","}","#"
*/
Syn=IDENTR;
Syn=IDENTIFIER;
token+=temp;
++ptr;
temp=Source[ptr];
@ -171,35 +190,68 @@ void Scanner(int &Syn,const char Source[],std::string &token,int &ptr)
}
else
{
Syn=SCANEND;
Syn=FAIL;
std::cout<<"[Error] Unexpected error occurred: "<<temp<<std::endl;
++ptr;
return;
}
if(token=="")
{
Syn=ERROROCC;
std::cout<<"[Error] Cannot identify special id."<<std::endl;
Syn=ERRORFOUND;
std::cout<<"[Error] Cannot identify "<<std::endl;
}
return;
}
void help()
{
std::cout<<">> exit: exit the programe."<<std::endl;
std::cout<<">> clear: clean the screen."<<std::endl;
std::cout<<">> help: find help."<<std::endl;
std::cout<<">> input the file name to scan."<<std::endl;
}
int main()
{
int Syn=0,Ptr=0;
std::string token;
InputFile("source.nas");
while(Syn!=SCANEND && Syn!=ERROROCC)
help();
while(1)
{
Scanner(Syn,ResourcePrograme,token,Ptr);
if(Syn==IDENTR)
std::cout<<"( "<<token<<" , ---- )"<<std::endl;
else if(Syn==SELFD)
std::cout<<"( 标识符 , "<<token<<" )"<<std::endl;
else if(Syn==NUMBER)
std::cout<<"( Number , "<<token<<" )"<<std::endl;
else if(Syn==RESERV)
std::cout<<"( Reserve Word , "<<token<<" )"<<std::endl;
int Syn=0;//token type
int Ptr=0;//pointer to one char in ResourcePrograme
std::string token;
std::string FileNameOrCommand;
std::cout<<">> ";
std::cin>>FileNameOrCommand;
if(FileNameOrCommand=="exit")
break;
else if(FileNameOrCommand=="clear")
{
system("cls");
continue;
}
else if(FileNameOrCommand=="help")
{
help();
continue;
}
//std::ofstream fout("Data.txt");
InputFile(FileNameOrCommand);
while(Syn!=SCANEND && Syn!=ERRORFOUND)
{
Scanner(Syn,ResourcePrograme,token,Ptr);
if(Syn==IDENTIFIER)
std::cout<<"( "<<token<<" , ---- )"<<std::endl;
else if(Syn==SELFDEFINE)
std::cout<<"( 标识符 , "<<token<<" )"<<std::endl;
else if(Syn==NUMBER)
std::cout<<"( Number , "<<token<<" )"<<std::endl;
else if(Syn==RESERVEWORD)
std::cout<<"( Reserve Word , "<<token<<" )"<<std::endl;
}
std::cout<<">> Complete scanning \""<<FileNameOrCommand<<"\"."<<std::endl;
//fout.close();
}
return 0;
}