362 lines
11 KiB
C++
362 lines
11 KiB
C++
#ifndef __NASAL_LEXER_H__
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#define __NASAL_LEXER_H__
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#define IS_IDENTIFIER(c) ((c=='_')||('a'<=c && c<='z')||('A'<=c&&c<='Z'))
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#define IS_HEX_NUMBER(c) (('0'<=c&&c<='9')||('a'<=c&&c<='f')||('A'<=c && c<='F'))
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#define IS_OCT_NUMEBR(c) ('0'<=c&&c<='7')
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#define IS_DIGIT(c) ('0'<=c&&c<='9')
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#define IS_STRING(c) (c=='\''||c=='\"'||c=='`')
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// single operators have only one character
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#define IS_SINGLE_OPERATOR(c) (c=='('||c==')'||c=='['||c==']'||c=='{'||c=='}'||c==','||c==';'||c=='|'||c==':'||\
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c=='?'||c=='`'||c=='&'||c=='@'||c=='%'||c=='$'||c=='^'||c=='\\')
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// calculation operators may have two chars, for example: += -= *= /= ~= != == >= <=
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#define IS_CALC_OPERATOR(c) (c=='='||c=='+'||c=='-'||c=='*'||c=='!'||c=='/'||c=='<'||c=='>'||c=='~')
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#define IS_NOTE(c) (c=='#')
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enum token_type
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{
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tok_null=0,
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tok_num,tok_str,tok_id,
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tok_for,tok_forindex,tok_foreach,tok_while,
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tok_var,tok_func,tok_break,tok_continue,
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tok_ret,tok_if,tok_elsif,tok_else,tok_nil,
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tok_lcurve,tok_rcurve,
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tok_lbracket,tok_rbracket,
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tok_lbrace,tok_rbrace,
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tok_semi,tok_and,tok_or,tok_comma,tok_dot,tok_ellipsis,tok_quesmark,
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tok_colon,tok_add,tok_sub,tok_mult,tok_div,tok_link,tok_not,
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tok_eq,
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tok_addeq,tok_subeq,tok_multeq,tok_diveq,tok_lnkeq,
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tok_cmpeq,tok_neq,tok_less,tok_leq,tok_grt,tok_geq,
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tok_eof
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};
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struct
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{
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const char* str;
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const int tok_type;
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}token_table[]=
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{
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{"for" ,tok_for },
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{"forindex",tok_forindex },
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{"foreach" ,tok_foreach },
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{"while" ,tok_while },
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{"var" ,tok_var },
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{"func" ,tok_func },
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{"break" ,tok_break },
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{"continue",tok_continue },
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{"return" ,tok_ret },
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{"if" ,tok_if },
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{"elsif" ,tok_elsif },
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{"else" ,tok_else },
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{"nil" ,tok_nil },
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{"(" ,tok_lcurve },
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{")" ,tok_rcurve },
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{"[" ,tok_lbracket },
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{"]" ,tok_rbracket },
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{"{" ,tok_lbrace },
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{"}" ,tok_rbrace },
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{";" ,tok_semi },
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{"and" ,tok_and },
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{"or" ,tok_or },
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{"," ,tok_comma },
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{"." ,tok_dot },
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{"..." ,tok_ellipsis },
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{"?" ,tok_quesmark },
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{":" ,tok_colon },
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{"+" ,tok_add },
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{"-" ,tok_sub },
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{"*" ,tok_mult },
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{"/" ,tok_div },
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{"~" ,tok_link },
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{"!" ,tok_not },
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{"=" ,tok_eq },
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{"+=" ,tok_addeq },
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{"-=" ,tok_subeq },
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{"*=" ,tok_multeq },
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{"/=" ,tok_diveq },
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{"~=" ,tok_lnkeq },
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{"==" ,tok_cmpeq },
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{"!=" ,tok_neq },
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{"<" ,tok_less },
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{"<=" ,tok_leq },
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{">" ,tok_grt },
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{">=" ,tok_geq },
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{nullptr ,-1 }
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};
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struct token
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{
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int line;
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int type;
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std::string str;
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token(int l=0,int t=tok_null,std::string s=""){line=l;type=t;str=s;}
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};
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class nasal_lexer
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{
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private:
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int error;
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int res_size;
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int line;
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int ptr;
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std::string line_code;
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std::string res;
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std::vector<token> token_list;
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int get_tok_type(const std::string&);
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void die(const char*);
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std::string id_gen();
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std::string num_gen();
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std::string str_gen();
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public:
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void openfile(const std::string&);
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void scanner();
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void print_token();
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int get_error(){return error;}
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std::vector<token>& get_token_list(){return token_list;}
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};
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void nasal_lexer::openfile(const std::string& filename)
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{
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error=0;
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res.clear();
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std::ifstream fin(filename,std::ios::binary);
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if(fin.fail())
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{
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++error;
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std::cout<<"[lexer] cannot open file <"<<filename<<">.\n";
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return;
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}
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while(!fin.eof())
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{
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char c=fin.get();
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if(fin.eof())
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break;
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res+=c;
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}
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return;
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}
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int nasal_lexer::get_tok_type(const std::string& tk_str)
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{
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for(int i=0;token_table[i].str;++i)
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if(tk_str==token_table[i].str)
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return token_table[i].tok_type;
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return tok_null;
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}
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void nasal_lexer::die(const char* error_info)
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{
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++error;
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std::cout<<"[lexer] line "<<line<<" column "<<line_code.length()<<": \n"<<line_code<<"\n";
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for(auto i:line_code)
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std::cout<<(i=='\t'?'\t':' ');
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std::cout<<"^"<<error_info<<'\n';
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return;
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}
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std::string nasal_lexer::id_gen()
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{
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std::string token_str="";
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while(ptr<res_size && (IS_IDENTIFIER(res[ptr])||IS_DIGIT(res[ptr])))
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token_str+=res[ptr++];
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line_code+=token_str;
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return token_str;
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// after running this process, ptr will point to the next token's beginning character
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}
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std::string nasal_lexer::num_gen()
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{
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// generate hex number
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if(ptr+1<res_size && res[ptr]=='0' && res[ptr+1]=='x')
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{
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std::string token_str="0x";
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ptr+=2;
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while(ptr<res_size && IS_HEX_NUMBER(res[ptr]))
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token_str+=res[ptr++];
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line_code+=token_str;
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if(token_str.length()<3)// "0x"
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die("incorrect number.");
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return token_str;
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}
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// generate oct number
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else if(ptr+1<res_size && res[ptr]=='0' && res[ptr+1]=='o')
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{
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std::string token_str="0o";
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ptr+=2;
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while(ptr<res_size && IS_OCT_NUMEBR(res[ptr]))
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token_str+=res[ptr++];
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line_code+=token_str;
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if(token_str.length()<3)// "0o"
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die("incorrect number.");
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return token_str;
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}
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// generate dec number
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// dec number -> [0~9][0~9]*(.[0~9]*)(e|E(+|-)0|[1~9][0~9]*)
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std::string token_str="";
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while(ptr<res_size && IS_DIGIT(res[ptr]))
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token_str+=res[ptr++];
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if(ptr<res_size && res[ptr]=='.')
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{
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token_str+=res[ptr++];
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while(ptr<res_size && IS_DIGIT(res[ptr]))
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token_str+=res[ptr++];
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// "xxxx." is not a correct number
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if(token_str.back()=='.')
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{
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line_code+=token_str;
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die("incorrect number.");
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return "0";
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}
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}
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if(ptr<res_size && (res[ptr]=='e' || res[ptr]=='E'))
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{
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token_str+=res[ptr++];
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if(ptr<res_size && (res[ptr]=='-' || res[ptr]=='+'))
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token_str+=res[ptr++];
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while(ptr<res_size && IS_DIGIT(res[ptr]))
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token_str+=res[ptr++];
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// "xxxe(-|+)" is not a correct number
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if(token_str.back()=='e' || token_str.back()=='E' || token_str.back()=='-' || token_str.back()=='+')
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{
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line_code+=token_str;
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die("incorrect number.");
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return "0";
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}
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}
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line_code+=token_str;
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return token_str;
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}
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std::string nasal_lexer::str_gen()
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{
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std::string token_str="";
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char str_begin=res[ptr];
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line_code+=str_begin;
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while(++ptr<res_size && res[ptr]!=str_begin)
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{
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line_code+=res[ptr];
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if(res[ptr]=='\n')
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{
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line_code="";
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++line;
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}
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if(res[ptr]=='\\' && ptr+1<res_size)
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{
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line_code+=res[++ptr];
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switch(res[ptr])
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{
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case 'a': token_str.push_back('\a');break;
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case 'b': token_str.push_back('\b');break;
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case 'f': token_str.push_back('\f');break;
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case 'n': token_str.push_back('\n');break;
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case 'r': token_str.push_back('\r');break;
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case 't': token_str.push_back('\t');break;
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case 'v': token_str.push_back('\v');break;
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case '?': token_str.push_back('\?');break;
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case '0': token_str.push_back('\0');break;
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case '\\':token_str.push_back('\\');break;
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case '\'':token_str.push_back('\'');break;
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case '\"':token_str.push_back('\"');break;
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default: token_str.push_back(res[ptr]);break;
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}
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continue;
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}
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token_str+=res[ptr];
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}
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// check if this string ends with a " or '
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if(ptr++>=res_size)
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die("get EOF when generating string.");
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if(str_begin=='`' && token_str.length()!=1)
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die("\'`\' is used for string that includes one character.");
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return token_str;
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}
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void nasal_lexer::scanner()
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{
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token_list.clear();
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line=1;
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ptr=0;
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line_code="";
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res_size=res.size();
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std::string token_str;
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while(ptr<res_size)
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{
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while(ptr<res_size && (res[ptr]==' ' || res[ptr]=='\n' || res[ptr]=='\t' || res[ptr]=='\r' || res[ptr]<0))
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{
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// these characters will be ignored, and '\n' will cause ++line
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line_code+=res[ptr];
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if(res[ptr++]=='\n')
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{
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++line;
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line_code="";
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}
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}
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if(ptr>=res_size) break;
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if(IS_IDENTIFIER(res[ptr]))
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{
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token_str=id_gen();
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token_list.push_back({line,get_tok_type(token_str),token_str});
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if(!token_list.back().type)
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token_list.back().type=tok_id;
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}
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else if(IS_DIGIT(res[ptr]))
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token_list.push_back({line,tok_num,num_gen()});
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else if(IS_STRING(res[ptr]))
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token_list.push_back({line,tok_str,str_gen()});
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else if(IS_SINGLE_OPERATOR(res[ptr]))
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{
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token_str=res[ptr];
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line_code+=res[ptr];
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int type=get_tok_type(token_str);
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if(!type)
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die("incorrect operator.");
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token_list.push_back({line,type,token_str});
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++ptr;
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}
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else if(res[ptr]=='.')
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{
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if(ptr+2<res_size && res[ptr+1]=='.' && res[ptr+2]=='.')
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{
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token_str="...";
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ptr+=3;
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}
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else
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{
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token_str=".";
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++ptr;
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}
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line_code+=token_str;
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token_list.push_back({line,get_tok_type(token_str),token_str});
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}
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else if(IS_CALC_OPERATOR(res[ptr]))
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{
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// get calculation operator
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token_str=res[ptr++];
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if(ptr<res_size && res[ptr]=='=')
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token_str+=res[ptr++];
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line_code+=token_str;
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token_list.push_back({line,get_tok_type(token_str),token_str});
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}
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else if(IS_NOTE(res[ptr]))// avoid note, after this process ptr will point to a '\n', so next loop line counter+1
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while(++ptr<res_size && res[ptr]!='\n');
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else
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{
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line_code+=res[ptr++];
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die("unknown character.");
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}
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}
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token_list.push_back({line,tok_eof,""});
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res.clear();
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return;
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}
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void nasal_lexer::print_token()
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{
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for(auto& tok:token_list)
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std::cout<<"("<<tok.line<<" | "<<tok.str<<")\n";
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return;
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}
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#endif |