acm_VIM

题目.jpg

#include 
#include 
#include 
using namespace std;

int n, sline, eline, pos_s, p1, p2, p3;
char separator;
string text[105], command, lastreplace, repla, replaceby;
bool changed;

void reget(int &s, int &e, string str)
{
    //获取待替换文本范围
    int p = str.find(',');
    s = 0;
    //获取起始行号
    for (int i = 0; i < p; ++i)
    {
        s *= 10;
        s += str[i] - '0';
    }
    e = 0;
    //获取终止行
    for (int i = p + 1; i < str.size(); ++i)
    {
        e *= 10;
        e += str[i] - '0';
    }
}

int main()
{
    cin >> n;
    cin.get();//输入换行符，保证getline()正常读取行
    if (n == 0) return 0;//!!
    for (int i = 1; i <= n; ++i) getline(cin, text[i]);
    lastreplace = "";
    int flag = 0;
    while (getline(cin, command)) {
        if (flag) cout << endl;//相邻两行间的空行
        flag = true;
        pos_s = command.find('s');
        if (pos_s == 2) {//%s,表示替换的范围是所有行
            sline = 1;
            eline = n;
        }
        else {
            reget(sline, eline, command.substr(1, pos_s - 1));
        }
        //因为分割符有多种可能，所以利用第一次找到的分隔符去寻找
        //就不必知道分隔符具体是谁
        separator = command[pos_s + 1];//s后面便是分隔符
        p1 = pos_s + 1;
        p2 = command.find(separator, p1 + 1);
        p3 = command.find(separator, p2 + 1);
        repla = command.substr(p1 + 1, p2 - p1 - 1);
        replaceby = command.substr(p2 + 1, p3 - p2 - 1);
        //如果pattern为空就使用上次不为空的pattern
        //而string是可以为空的
        if (repla == "") repla = lastreplace;
        else lastreplace = repla;
        changed = false;
        int re_len = repla.size(), reby_len = replaceby.size();
        for (int i = sline; i <= eline; ++i)
        {
            bool c = 0;
            int p = text[i].find(repla, 0);
            while (p != -1) {
                text[i].replace(p, re_len, replaceby);
                p = text[i].find(repla, p + reby_len);//从后面开始找，避免递归替换
                changed = true;
                c = 1;
            }
            if (c) cout << setw(4) << i << "  " << text[i] << endl;
        }
        if (!changed) cout << "Pattern not found" << endl;
    }
    system("pause");
    return 0;
}