代码中会引起编译时错误的行
将用特殊的注释符号 //! 进行注释
可能产生的错误信息，对文件编译会看到文件的编号
//: C04:Showerr.cpp {RunByHand}
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Un-comment error generators.
#include <cstddef>
#include <cstdlib>
#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include "../require.h"
using namespace std;
const string USAGE =
"usage: showerr filename chapnum\n"
"where filename is a C++ source file\n"
"and chapnum is the chapter name it's in.\n"
"Finds lines commented with //! and removes\n"
"the comment, appending //(#) where # is unique\n"
"across all files, so you can determine\n"
"if your compiler finds the error.\n"
"showerr /r\n"
"resets the unique counter.";
class Showerr {
const int CHAP;
const string MARKER, FNAME;
// File containing error number counter:
const string ERRNUM;
// File containing error lines:
const string ERRFILE;
stringstream edited; // Edited file
int counter;
public:
Showerr(const string& f, const string& en,
const string& ef, int c)
: CHAP(c), MARKER("//!"), FNAME(f), ERRNUM(en),
ERRFILE(ef), counter(0) {}
void replaceErrors() {
ifstream infile(FNAME.c_str());
assure(infile, FNAME.c_str());
ifstream count(ERRNUM.c_str());
if(count) count >> counter;
int linecount = 1;
string buf;
ofstream errlines(ERRFILE.c_str(), ios::app);
assure(errlines, ERRFILE.c_str());
while(getline(infile, buf)) {
// Find marker at start of line:
size_t pos = buf.find(MARKER);
if(pos != string::npos) {
// Erase marker:
buf.erase(pos, MARKER.size() + 1);
// Append counter & error info:
ostringstream out;
out << buf << " // (" << ++counter << ") "
<< "Chapter " << CHAP
<< " File: " << FNAME
<< " Line " << linecount << endl;
edited << out.str();
errlines << out.str(); // Append error file
}
else
edited << buf << "\n"; // Just copy
++linecount;
}
}
void saveFiles() {
ofstream outfile(FNAME.c_str()); // Overwrites
assure(outfile, FNAME.c_str());
outfile << edited.rdbuf();
ofstream count(ERRNUM.c_str()); // Overwrites
assure(count, ERRNUM.c_str());
count << counter; // Save new counter
}
};
int main(int argc, char* argv[]) {
const string ERRCOUNT("../errnum.txt"),
ERRFILE("../errlines.txt");
requireMinArgs(argc, 1, USAGE.c_str());
if(argv[1][0] == '/' || argv[1][0] == '-') {
// Allow for other switches:
switch(argv[1][1]) {
case 'r': case 'R':
cout << "reset counter" << endl;
remove(ERRCOUNT.c_str()); // Delete files
remove(ERRFILE.c_str());
return EXIT_SUCCESS;
default:
cerr << USAGE << endl;
return EXIT_FAILURE;
}
}
if(argc == 3) {
Showerr s(argv[1], ERRCOUNT, ERRFILE, atoi(argv[2]));
s.replaceErrors();
s.saveFiles();
}
} ///:~用自己选择的标记替代文件中的标记
程序从每个文件中每次读入一行
然后从这行的开头逐个字符搜索指定的标记
修改这一行并把它放入错误行列表和字符串流对象edited中输出 加参数 cpp文件 4 如 Showerr.cpp 4
在上一个目录会输出文件errlines.txt 和 errnum.txt
errlines.txt
"Finds lines commented with and removes\n" // (1) Chapter 0 File: Showerr.cpp Line 21
: CHAP(c), MARKER("), FNAME(f), ERRNUM(en), // (2) Chapter 0 File: Showerr.cpp Line 40
"Finds lines commented with and removes\n // (3) Chapter 4 File: Showerr.cpp Line 21
: CHAP(c), MARKER("), FNAME(f), ERRNUM(en), // (4) Chapter 4 File: Showerr.cpp Line 40
只能显示一个错误
errnum.txt
4
源文件也改动
//: C04:Showerr.cpp {RunByHand}
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Un-comment error generators.
#include <cstddef>
#include <cstdlib>
#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include "../require.h"
using namespace std;
const string USAGE =
"usage: showerr filename chapnum\n
"where filename is a C++ source file\n
"and chapnum is the chapter name it's in.\n
"Finds lines commented with and removes\n // (3) Chapter 4 File: Showerr.cpp Line 21
"the comment, appending //(#) where # is unique\n
"across all files, so you can determine\n
"if your compiler finds the error.\n
"showerr /r\n
"resets the unique counter.
class Showerr {
const int CHAP;
const string MARKER, FNAME;
// File containing error number counter:
const string ERRNUM;
// File containing error lines:
const string ERRFILE;
stringstream edited; // Edited file
int counter;
public:
Showerr(const string& f, const string& en,
const string& ef, int c)
: CHAP(c), MARKER("), FNAME(f), ERRNUM(en), // (4) Chapter 4 File: Showerr.cpp Line 40
ERRFILE(ef), counter(0) {}
void replaceErrors() {
ifstream infile(FNAME.c_str());
assure(infile, FNAME.c_str());
ifstream count(ERRNUM.c_str());
if(count) count >> counter;
int linecount = 1;
string buf;
ofstream errlines(ERRFILE.c_str(), ios::app);
assure(errlines, ERRFILE.c_str());
while(getline(infile, buf)) {
// Find marker at start of line:
size_t pos = buf.find(MARKER);
if(pos != string::npos) {
// Erase marker:
buf.erase(pos, MARKER.size() + 1);
// Append counter & error info:
ostringstream out;
out << buf << " // (" << ++counter << ") "
<< "Chapter " << CHAP
<< " File: " << FNAME
<< " Line " << linecount << endl;
edited << out.str();
errlines << out.str(); // Append error file
}
else
edited << buf << "\n"; // Just copy
++linecount;
}
}
void saveFiles() {
ofstream outfile(FNAME.c_str()); // Overwrites
assure(outfile, FNAME.c_str());
outfile << edited.rdbuf();
ofstream count(ERRNUM.c_str()); // Overwrites
assure(count, ERRNUM.c_str());
count << counter; // Save new counter
}
};
int main(int argc, char* argv[]) {
const string ERRCOUNT("../errnum.txt"),
ERRFILE("../errlines.txt");
requireMinArgs(argc, 1, USAGE.c_str());
if(argv[1][0] == '/' || argv[1][0] == '-') {
// Allow for other switches:
switch(argv[1][1]) {
case 'r': case 'R':
cout << "reset counter" << endl;
remove(ERRCOUNT.c_str()); // Delete files
remove(ERRFILE.c_str());
return EXIT_SUCCESS;
default:
cerr << USAGE << endl;
return EXIT_FAILURE;
}
}
if(argc == 3) {
Showerr s(argv[1], ERRCOUNT, ERRFILE, atoi(argv[2]));
s.replaceErrors();
s.saveFiles();
}
} ///:~