Merge pull request pezy#75 from cheng668/master

Exercise 17.22

ch17/ex17.22/ex17.22/main.cpp

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+/***************************************************************************
+*  @file       main.cpp
+*  @author     Cheng668
+*  @date       10  Sept 2016
+*  @remark     This code is for the exercises from C++ Primer 5th Edition
+*  @note
+***************************************************************************/
+//!
+//! Exercise 17.22
+//! Rewrite your phone program so that it allows any number
+//! of whitespace characters to separate the three parts of a phone number.
+
+#include<iostream>
+using std::cerr;
+using std::cout;
+using std::cin;
+using std::endl;
+using std::istream;
+using std::ostream;
+
+#include<fstream>
+using std::ifstream;
+using std::ofstream;
+
+#include<sstream>
+using std::istringstream;
+using std::ostringstream;
+
+#include<string>
+using std::string;
+
+#include<vector>
+using std::vector;
+
+#include <regex>
+using std::regex;
+using std::sregex_iterator;
+using std::smatch;
+
+struct PersonInfo {
+	string name;
+	vector<string> phones;
+};
+
+bool valid(const smatch& m);
+void read_record(istream& is, ostream& ou, vector<PersonInfo>& people);
+void format_record(ostream& os, const string& str, PersonInfo& people);
+//! fake function that makes the program compile
+string format(const string &num) { return num; }
+
+int main()
+{
+	vector<PersonInfo> people;
+
+	string filename;
+	cout << "Please input a record file name: ";
+	cin >> filename;
+	cout << endl;
+	ifstream fin(filename);
+
+	if (fin.is_open())
+	{
+		ofstream fout("data\\result.txt", ofstream::trunc);
+		read_record(fin, fout, people);
+	}
+	else
+	{
+		cout << "Fail to open file " << filename << endl;
+	}
+	system("pause");
+	return 0;
+}
+
+bool valid(const smatch& m)
+{
+	//! if there is an open parenthesis before the area code
+	if (m[1].matched)
+		//! the area code must be followed by a close parenthesis
+		//! and followed immediately by the rest of the number or a space
+		return m[3].matched
+		&& (m[4].matched == 0 || m[4].str() == " ");
+	else
+		//! then there can't be a close after the area code
+		//! the delimiters between the other two components must match
+		return !m[3].matched
+		&& m[4].str() == m[6].str();
+}
+
+void read_record(istream& is,ostream& os, vector<PersonInfo>& people)
+{
+	string line, word; //! will hold a line and word from input, respectively
+	//! read the input a line at a time until cin hits end-of-file (or another error)
+	while (getline(is, line))
+	{
+		PersonInfo info; //! create an object to hold this record's data
+		istringstream record(line); //! bind record to the line we just read
+		record >> info.name; //! read the name
+		while (getline(record, word)) //! read all the phone numbers includes the space character
+			format_record(os,word,info);
+		people.push_back(info); //! append this record to people
+	}
+	return;
+}
+
+void format_record(ostream& os, const string& phones, PersonInfo& people)
+{
+	string phone =
+		"(\\()?(\\d{3})(\\))?([-.]|\\s*)?(\\d{3})([-.]|\\s*)?(\\d{4})\\b";
+	regex r(phone);
+	ostringstream formatted, badNums; //! objects created on each loop
+	for (sregex_iterator it(phones.begin(), phones.end(), r), end_it;
+	it != end_it; ++it)
+	{
+		//! check whether the number's formatting is valid
+		if (!valid(*it))
+			//! string in badNums
+			badNums << " " << it->str();
+		else
+		{//! "writes" to formatted's string
+			formatted << " " << format(it->str());
+			people.phones.push_back(it->str());//!record the vaild phones 
+		}
+	}
+
+	if (badNums.str().empty()) //! there were no bad numbers
+		os << people.name << " " //! print the name
+		<< formatted.str() << endl; //! and reformatted numbers
+	else //! otherwise, print the name and bad numbers
+		cerr << "input error: " << people.name
+		<< " invalid number(s) " << badNums.str() << endl;
+}