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源.cpp
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源.cpp
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#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#define SIZE 1024
#define keyword_num 44
//C语言关键字
std::string keywords[44] = { "auto","break","case","char","const","continue",
"default","do","double","else","enum","extern",
"float","for","goto","if","int","long","register",
"return","short","signed","sizeof","static",
"struct","switch","typedef","union","unsigned",
"void","volatile","while","inline","restrict",
"_Bool","_Complex","_Imaginary",//C99新增的关键字
"_Alignas","_Alignof","_Atomic","_Static_assert",
"_Noreturn","_Thread_local","_Generic" };//C11新增的关键字
int state;//当前状态指示
char C;//存放当前读入的字符
int iskey = -1;
/*表示识别出的单词是否为用户自定义标识符还是关键字,
如果是用户自定义标识符则为-1,若是关键字则是关键字的记号*/
std::string token;//字符数组,存放当前正在识别的单词字符串
char* lexemebegin;//字符指针,指向输入缓冲区中当前单词的开始位置
int forward = -1;//向前指针
char buffer[SIZE];//输入缓冲区
int lines = 1;//文件的行数
int chars = 0;//文件的总字符数
struct symbol {
std::string attribute;//属性
std::string name;//名字
std::string token;//记号
std::string category;//类别
int count = 0;//次数
};//符号表
struct count {
int count_keyword = 0;//关键字
int count_id = 0;//标识符
int count_num = 0;//常数
int count_string = 0;//字符串
int count_assignment_operator = 0;//赋值运算符
int count_bit_operator = 0;//位运算符
int count_arithmetic_operator = 0;//算数运算符
int count_logical_operator = 0;//逻辑运算符
int count_char = 0;//字符
int count_relational_operator = 0;//关系运算符
int count_other_symbol = 0;//其他符号
};//统计表
count c;
std::vector<symbol> table;
/*每调用一次,根据向前指针forward的指示,从输入缓冲区中读一个字符,
并把它放入变量C中,然后移动forward使之指向下一个字符*/
void get_char() {
forward++;
C = buffer[forward];
if (C == '\n')
lines++;//统计行数
if (C != '\n' && C != '\t' && C != ' ')
chars++;//统计字符数
}
/*每次调用时,检查C中的字符是否为空格,若是空格,就反复调用过程get_char,
直到C中进入一个非空字符为止*/
void get_nbc() {
if (C == ' ') {
get_char();
}
}
//每次调用时,把C中的字符连接在token中的字符串后面
void cat() {
token.push_back(C);
}
//判断C中的字符是否为字母,若是字符则返回true,否则返回false
bool isLetter() {
if ((C <= 'z' && C >= 'a') || (C <= 'Z' && C >= 'A') || C == '_')
return true;
else
return false;
}
//判断C语言中的字符是否为数字,若是数字则返回true,否则返回false
bool isDigit() {
if (C <= '9' && C >= '0')
return true;
else
return false;
}
//向前指针forw后退一个字符
void retract() {
forward--;
}
/*根据token中的单词查关键字表,若token中的单词是关键字,
则返回1,否则返回-1*/
int reserve() {
for (int i = 0; i < 44; i++) {
if (token == keywords[i])
return 1;//是关键字就返回1
}
return -1;//不是关键字就返回-1
}
//将token中的字符串转换成整数
int SToI() {
return atoi(token.c_str());
}
//将token中的字符串转换成浮点数
float SToF() {
return atof(token.c_str());
}
//将识别出来的用记号插入符号表
int table_insert(std::string t, std::string a, std::string c) {
int i = 0;
for (i = 0; i < table.size(); i++) {
if (token == table[i].name) {
table[i].count++;
return 0;
}
}
symbol s;
s.name = token;
s.token = t;
s.attribute = a;
s.count = 1;
s.category = c;
table.push_back(s);
return 0;
}
std::string find(std::string name) {
int i = 0;
for (; i < table.size(); i++) {
if (table[i].name == name) {
return std::to_string(i);
}
}
return std::to_string(i);
}
//对发现的错误进行响应的处理
void error() {
std::cout << "There is an error in line " << lines << std::endl;
state = 0;
}
void analyse(std::ifstream& fs) {
//读取文件内容
fs.read(buffer, SIZE - 1);
if (fs.gcount() < SIZE - 1) {
buffer[fs.gcount()] = EOF;//向输入缓存区加入结束标志
}
state = 0;//初始状态
int j = 0;
while (C != EOF) {
switch (state) {
case 0:
token.clear();
get_char();
get_nbc();
if (isLetter()) {
state = 1;
break;
}
if (isDigit()) {
state = 2;
break;
}
switch (C) {
case '<':
state = 8;
break;
case '>':
state = 9;
break;
case ':':
state = 10;
break;
case '/':
state = 11;
break;
case '=':
state = 14;
break;
case '+':
state = 15;
break;
case '-':
state = 16;
break;
case '(':
state = 0;
cat();
table_insert("(", "-", "ohter symbol");
break;
case ')':
state = 0;
cat();
table_insert(")", "-", "ohter symbol");
break;
case ';':
state = 0;
cat();
table_insert(";", "-", "ohter symbol");
break;
case '?':
state = 0;
cat();
table_insert("?", "-", "conditional operator");
break;
case '%':
state = 0;
cat();
table_insert("%", "-", "arithmetic operator");
break;
case '{':
state = 0;
cat();
table_insert("{", "-", "ohter symbol");
break;
case '}':
state = 0;
cat();
table_insert("}", "-", "ohter symbol");
break;
case '[':
state = 0;
cat();
table_insert("[", "-", "ohter symbol");
break;
case ']':
state = 0;
cat();
table_insert("]", "-", "ohter symbol");
break;
case '|':
state = 18;
break;
case '&':
state = 19;
break;
case '^':
state = 0;
cat();
table_insert("^", "-", "bit operator");
break;
case '*':
state = 20;
break;
case '"':
state = 21;
break;
case '.':
state = 0;
break;
case '~':
state = 0;
cat();
table_insert("~", "-", "bit operator");
break;
case ',':
state = 0;
cat();
table_insert(",", "-", "ohter symbol");
break;
case '#':
state = 0;
cat();
table_insert("#", "-", "ohter symbol");
break;
case '\'':
state = 22;
break;
case ' ':
break;
case '\n':
break;
case '\t':
break;
default:
state = 13;
break;
}
break;
case 1://标识符状态
cat();
get_char();
if (isLetter() || isDigit())
state = 1;
else {
retract();
state = 0;
if (reserve() == 1) {
table_insert(token, "-", "keyword");
}
else {
table_insert("id", find(token), "id");
}
}
break;
case 2://常数状态
cat();
get_char();
if (isDigit())
state = 2;
else if (C == 'e' || C == 'E')
state = 5;
else if (C == '.')
state = 3;
else {
retract();
state = 0;
table_insert("num", token, "integer");
}
break;
case 3://小数点状态
cat();
get_char();
if (isDigit())
state = 4;
else {
state = 13;
}
break;
case 4://小数状态
cat();
get_char();
if (isDigit())
state = 4;
else if (C == 'e' || C == 'E')
state = 5;
else {
retract();
state = 0;
table_insert("num", token, "float");
}
break;
case 5://指数状态
cat();
get_char();
if (isDigit())
state = 7;
else if (C == '+' || C == '-')
state = 6;
else {
retract();
state = 13;
}
break;
case 6:
cat();
get_char();
if (isDigit())
state = 7;
else {
retract();
state = 13;
}
break;
case 7:
cat();
get_char();
if (isDigit())
state = 7;
else {
retract();
state = 0;
table_insert("num", token, "exponent");
}
break;
case 8://'<'状态
cat();
get_char();
switch (C) {
case '=':
cat();
state = 0;
table_insert("relop", "LE", "relational operator");
break;
case '>':
cat();
state = 0;
table_insert("relop", "NE", "relational operator");
break;
case '<':
cat();
state = 0;
table_insert(token, "-", "bit operator");
break;
default:
retract();
state = 0;
table_insert("relop", "LT", "relational operator");
break;
}
break;
case 9://'>'状态
cat();
get_char();
if (C == '=') {
cat();
state = 0;
table_insert("relop", "GE", "relational operator");
}
else if (C == '>') {
cat();
state = 0;
table_insert(token, "-", "bit operator");
}
else {
retract();
state = 0;
table_insert("relop", "GT", "relational operator");
}
break;
case 10://':'状态
cat();
get_char();
if (C == '=') {
cat();
state = 0;
table_insert("assign-op", "-", "assign-op");
}
else {
retract();
state = 0;
table_insert(token, "-", "ohter symbol");
}
break;
case 11://'/'状态
cat();
get_char();
if (C == '*')
state = 12;
else if (C == '/')
state = 17;
else if (C == '=') {
cat();
state = 0;
table_insert(token, "-", "assignment operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
break;
case 12://处理/*注释状态标志
get_char();
while (C != '*') {
get_char();
chars--;
}
get_char();
if (C == '/') {
token.clear();
chars = chars - 4;
state = 0;
}
else
state = 12;
break;
case 13:
error();
state = 0;
break;
case 14://'='状态
cat();
get_char();
if (C == '=') {
cat();
state = 0;
table_insert(token, "-", "relational operator");
}
else {
retract();
state = 0;
table_insert("relop", "EQ", "assignment operator");
}
break;
case 15://'+'状态
cat();
get_char();
if (C == '+') {
cat();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
else if (C == '=') {
cat();
state = 0;
table_insert(token, "-", "assignment operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
break;
case 16://'-'状态
cat();
get_char();
if (C == '-') {
cat();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
else if (C == '=') {
cat();
state = 0;
table_insert(token, "-", "assignment operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
break;
case 17://处理//注释状态标志
get_char();
while (C != '\n') {
get_char();
chars--;
}
token.clear();
chars = chars - 2;
state = 0;
break;
case 18: //处理'|'状态标志
cat();
get_char();
if (C == '|') {
cat();
state = 0;
table_insert(token, "-", "logical operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "bit operator");
}
break;
case 19://处理'&'状态标志
cat();
get_char();
if (C == '&') {
cat();
state = 0;
table_insert(token, "-", "logical operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "bit operator");
}
break;
case 20://处理'*'状态标志
cat();
get_char();
if (C == '=') {
cat();
state = 0;
table_insert(token, "-", "assignment operator");
}
else {
retract();
state = 0;
table_insert(token, "-", "arithmetic operator");
}
break;
case 21://处理'"'状态标志
cat();
get_char();
while (C != '"') {
cat();
get_char();
}
cat();
state = 0;
table_insert("literal", token, "string");
break;
case 22://处理'''状态标志
cat();
get_char();
j = 0;
while (C != '\'') {
cat();
get_char();
j++;
if (C == '\n') {
state = 13;
break;
}
}
if (j > 1) {
error();
state = 0;
break;
}
cat();
state = 0;
table_insert("char", token, "char");
break;
default:error(); state = 0; break;
}
}
fs.close();
}
void output() {
std::cout << "name \t\ttimes\t\ttoken\t\tattribute\t\tcategory\n";
for (int i = 0; i < table.size(); i++) {
if (table[i].category == "keyword")
c.count_keyword++;
if (table[i].category == "id")
c.count_id++;
if (table[i].token == "num")
c.count_num++;
if (table[i].category == "string")
c.count_string++;
if (table[i].category == "relational operator")
c.count_relational_operator++;
if (table[i].category == "relational operator")
c.count_relational_operator++;
if (table[i].category == "assignment operator")
c.count_assignment_operator++;
if (table[i].category == "bit operator")
c.count_bit_operator++;
if (table[i].category == "arithmetic operator")
c.count_arithmetic_operator++;
if (table[i].category == "logical operator")
c.count_logical_operator++;
if (table[i].category == "other symbol")
c.count_other_symbol++;
if (table[i].category == "char")
c.count_char++;
std::cout << table[i].name << "\t\t" << table[i].count << "\t\t" << table[i].token <<
"\t\t" << table[i].attribute << "\t\t\t" << table[i].category << std::endl;
}
if (c.count_keyword > 0)
std::cout << "count_keyword:" << c.count_keyword << std::endl;
if (c.count_id > 0)
std::cout << "count_id:" << c.count_id << std::endl;
if (c.count_num > 0)
std::cout << "count_num:" << c.count_num << std::endl;
if (c.count_string > 0)
std::cout << "count_string:" << c.count_string << std::endl;
if (c.count_char > 0)
std::cout << "count_char:" << c.count_char << std::endl;
if (c.count_relational_operator > 0)
std::cout << "count_relational_operator:" << c.count_relational_operator << std::endl;
if (c.count_assignment_operator > 0)
std::cout << "count_assignment_operator:" << c.count_assignment_operator << std::endl;
if (c.count_bit_operator > 0)
std::cout << "count_bit_operator:" << c.count_bit_operator << std::endl;
if (c.count_arithmetic_operator > 0)
std::cout << "count_arithmetic_operator:" << c.count_arithmetic_operator << std::endl;
if (c.count_logical_operator > 0)
std::cout << "count_logical_operator:" << c.count_logical_operator << std::endl;
std::cout << "line:" << lines << std::endl << "chars:" << chars;
}
int main() {
std::ifstream fs;
fs.open("t.txt", std::ios::in);
if (fs.is_open() == false)
exit(0);
analyse(fs);
output();
fs.close();
return 0;
}