exercise 17.21

ch17/ex17.21/data/record.txt

@@ -0,0 +1,4 @@
+green  (9998886666 9996668888
+morgan 2015552368 8625550123
+drew   9735550130
+lee    6095550132 2015550175 8005550000

ch17/ex17.21/main.cpp

@@ -0,0 +1,145 @@
+/***************************************************************************
+*  @file       main.cpp
+*  @author     Queequeg
+*  @date       26  Nov 2014
+*  @remark     This code is for the exercises from C++ Primer 5th Edition
+*  @note
+***************************************************************************/
+//!
+//! Exercise 17.21
+//! Rewrite your phone number program from ¡ì 8.3.2 (p. 323) to use the 
+//! valid function defined in this section.
+
+#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);
+bool read_record(istream& is, vector<PersonInfo>& people);
+void format_record(ostream& os, const vector<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 (read_record(fin, people))
+	{
+		ofstream fout("data\\result.txt", ofstream::trunc);
+		format_record(fout, people);
+	}
+	else
+	{
+		cout << "Fail to open file " << filename << endl;
+	}
+
+	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();
+}
+
+bool read_record(istream& is, vector<PersonInfo>& people)
+{
+	if (is)
+	{
+		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 (record >> word) //! read the phone numbers
+				info.phones.push_back(word); //! and store them
+			people.push_back(info); //! append this record to people
+		}
+		return true;
+	}
+	else
+		return false;
+}
+
+void format_record(ostream& os, const vector<PersonInfo>& people)
+{
+	string phone =
+		"(\\()?(\\d{3})(\\))?([-. ])?(\\d{3})([-. ]?)(\\d{4})";
+	regex r(phone);
+	smatch m;
+
+	for (const auto &entry : people) 
+	{
+		//! for each entry in people
+		ostringstream formatted, badNums; //! objects created on each loop
+		for (const auto &nums : entry.phones)
+		{
+			for (sregex_iterator it(nums.begin(), nums.end(), r), end_it;
+				it != end_it; ++it)
+			{
+				//! for each number
+				//! check whether the number's formatting is valid
+				if (!valid(*it))
+					//! string in badNums
+					badNums << " " << nums; 
+				else
+					//! "writes" to formatted's string
+					formatted << " " << format(nums);
+			}
+		}
+
+		if (badNums.str().empty()) //£¡ there were no bad numbers
+			os << entry.name << " " //£¡ print the name
+			   << formatted.str() << endl; //£¡ and reformatted numbers
+		else //£¡ otherwise, print the name and bad numbers
+			cerr << "input error: " << entry.name
+			     << " invalid number(s) " << badNums.str() << endl;
+	}
+}