Big5StringHandler.cpp

#include <iostream>
#include <string>
#include <vector>

using namespace std;

struct SplitResult {
	string odd = "", even = "";
};

bool isBig5(const string& data) {
	unsigned char left = data[0];
	unsigned char right = data[1];
	return ((left >= 0xA4 && left <= 0xC6) || (left >= 0xC9 && left <= 0xF9)) && ((right >= 0x40 && right <= 0x7E) || (right >= 0xA1 && right <= 0xFE));
}

string reverseString(const string& data) {
	vector<string> element;
	size_t length = data.length();
	for (size_t i = 0; i < length; ++i) {
		if (i >= length - 1) {
			element.push_back(string(1, data[i]));
			break;
		}
		string pattern(1, data[i]);
		pattern += data[i + 1];
		if (isBig5(pattern)) {
			element.push_back(pattern);
			++i;
		}
		else {
			element.push_back(string(1, data[i]));
		}
	}

	reverse(element.begin(), element.end());
	string ret = "";
	int size = element.size();
	for (int i = 0; i < size; ++i) {
		ret += element[i];
	}
	return ret;
}

int getWordCount(const string& data) {
	int ret = 0;
	size_t length = data.length();
	for (size_t i = 0; i < length; ++i) {
		if (i >= length - 1) {
			++ret;
			break;
		}
		string pattern(1, data[i]);
		pattern += data[i + 1];
		if (isBig5(pattern)) {
			++i;
		}
		++ret;
	}
	return ret;
}

SplitResult split(const string& data) {
	SplitResult ret;
	size_t length = data.length();

	int word = 0;
	for (size_t i = 0; i < length; ++i) {
		int now = word + 1;
		string* target;

		if (now % 2 == 0) {
			target = &ret.even;
		}
		else {
			target = &ret.odd;
		}

		if (i >= length - 1) {
			*target += data[i];
			break;
		}
		string pattern(1, data[i]);
		pattern += data[i + 1];
		if (isBig5(pattern)) {
			*target += pattern;
			++i;
		}
		else {
			*target += data[i];
		}
		++word;
	}
	return ret;
}

int main() {
	string input;
	cout << "請輸入一個字串 : ";
	getline(cin, input);
	cout << endl;

	cout << "字串長度 : " << getWordCount(input) << endl;
	cout << "字串位元長度 : " << input.length() << endl;
	cout << endl;

	cout << "字串反轉 : " << reverseString(input) << endl;
	SplitResult result = split(input);
	cout << "奇數位置字串 : " << result.odd << endl;
	cout << "偶數位置字串 : " << result.even << endl;
	cout << endl;

	system("pause");
	return EXIT_SUCCESS;
}