2024年12月完成（补充提交）

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 2/main.cpp

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+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+#include "urls.h"
+
+using std::cin;
+using std::cout;
+using std::endl;
+using std::sort;
+using std::string;
+using std::vector;
+
+int main() {
+    // 输入文本
+    cout << "输入一段文本: ";
+    string input;
+    std::getline(cin, input);
+
+    // 提取所有 URL
+    vector<string> urls = find_urls(input);
+
+    // 筛选出以 http:// 或 https:// 开头的 URL
+    vector<string> http_urls;
+    for (const string& url : urls) {
+        if (url.find("http://") == 0 || url.find("https://") == 0) {
+            http_urls.push_back(url);
+        }
+    }
+
+    // 按字母顺序排序
+    sort(http_urls.begin(), http_urls.end());
+
+    // 输出结果
+    cout << "排序后的 HTTP URLs:" << endl;
+    for (const string& url : http_urls) {
+        cout << url << endl;
+    }
+
+    return 0;
+}

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 2/urls.cpp

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+#include <algorithm>
+#include <cctype>
+#include <string>
+#include <vector>
+
+#include "urls.h"
+
+using std::find;
+using std::find_if;
+
+#ifndef _MSC_VER
+using std::isalnum;
+using std::isalpha;
+using std::isdigit;
+#endif
+
+using std::search;
+using std::string;
+using std::vector;
+
+bool not_url_char(char);
+
+string::const_iterator
+url_end(string::const_iterator, string::const_iterator);
+
+string::const_iterator
+url_beg(string::const_iterator, string::const_iterator);
+vector<string> find_urls(const string& s)
+{
+	vector<string> ret;
+	typedef string::const_iterator iter;
+	iter b = s.begin(), e = s.end();
+
+	// look through the entire input
+	while (b != e) {
+
+		// look for one or more letters followed by `://'
+		b = url_beg(b, e);
+
+		// if we found it
+		if (b != e) {
+			// get the rest of the \s-1URL\s0
+			iter after = url_end(b, e);
+
+			// remember the \s-1URL\s0
+			ret.push_back(string(b, after));
+
+			// advance `b' and check for more \s-1URL\s0s on this line
+			b = after;
+		}
+	}
+	return ret;
+}
+
+string::const_iterator
+url_end(string::const_iterator b, string::const_iterator e)
+{
+	return find_if(b, e, not_url_char);
+}
+
+bool not_url_char(char c)
+{
+	// characters, in addition to alphanumerics, that can appear in a \s-1URL\s0
+	static const string url_ch = "~;/?:@=&$-_.+!*'(),";
+
+	// see whether `c' can appear in a \s-1URL\s0 and return the negative
+	return !(isalnum(c) ||
+	         find(url_ch.begin(), url_ch.end(), c) != url_ch.end());
+}
+
+string::const_iterator
+url_beg(string::const_iterator b, string::const_iterator e)
+{
+	static const string sep = "://";
+
+	typedef string::const_iterator iter;
+
+	// `i' marks where the separator was found
+	iter i = b;
+
+	while ((i = search(i, e, sep.begin(), sep.end())) != e) {
+
+		// make sure the separator isn't at the beginning or end of the line
+		if (i != b && i + sep.size() != e) {
+
+			// `beg' marks the beginning of the protocol-name
+			iter beg = i;
+			while (beg != b && isalpha(beg[-1]))
+				--beg;
+
+			// is there at least one appropriate character before and after the separator?
+			if (beg != i && !not_url_char(i[sep.size()]))
+				return beg;
+		}
+
+		// the separator we found wasn't part of a \s-1URL\s0; advance `i' past this separator
+		i += sep.size();
+	}
+	return e;
+}
+

Curriculum Design and Report/张梦南 1220310013 高级语言程序课程设计/Curriculum design 2/urls.h

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+#ifndef GUARD_urls_h
+#define GUARD_urls_h
+
+#include <vector>
+#include <string>
+
+std::vector<std::string> find_urls(const std::string& s);
+
+#endif