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why2332742172
LexicalAnalysis
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analyse_first.cpp
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analyse_first.cpp
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//
// Created by Strawberry on 2021/10/6.
//
//第一遍分析 读入源程序 一行一行的读入 然后存入缓冲区
#include "Utils.h"
void analyse_first(){
cout << "Starting Analyse First" << endl;
int current_line = 1; //当前所在行数
char temp_char; //暂存从文件读取的字符
string temp_string; //连接字符串
//逐行读取 碰到'\n' 结束一行的读取
target_file.seekg(0); //让文件指针回到文件头部
if(!target_file.eof()){
line_num++;
}
while(target_file.peek() != EOF){
//一直循环读取文件
target_file.get(temp_char);
if(temp_char != '\n' && temp_char != ' ' && temp_char != '\t'){
char_num++;
}
temp_string += temp_char;
if('\n' == temp_char){
//如果读到了换行符 代表已经读取了一行
//首先先给总行数加一
line_num++;
//然后将此行放入map中 并当前行号加一
buffers[current_line] = temp_string;
//cout << "line:" << current_line << "-->:" << buffers[current_line] << endl;
//然后清空当前temp_string
temp_string = "";
//然后更新当前行号
current_line++;
}
if(target_file.peek() == EOF){
//最后一行的文字没有换行符 给他加上结束符 '\0'
temp_string += '\0';
buffers[current_line] = temp_string;
//cout << "line:" << current_line << "-->:" << buffers[current_line] << endl;
}
}
}
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