Merge pull request #16 from snandasena/dev

Dev

Author: snandasena

Udemy/CMakeLists.txt

@@ -1 +1,3 @@
-add_subdirectory(SOLID)
+add_subdirectory(SOLID)
+
+add_subdirectory(builder )

Udemy/builder/CMakeLists.txt

@@ -0,0 +1,5 @@
+project(builder)
+
+#add_executable(motivation src/motivation_demo.cpp)
+#add_executable(motivation_v1 src/motivation_improved_v1.cpp)
+add_executable(fluent_builder src/fluent_builder.cpp)

Udemy/builder/src/fluent_builder.cpp

@@ -0,0 +1,118 @@
+//
+// Created by sajith on 6/10/22.
+//
+
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <memory>
+
+
+using namespace std;
+
+
+struct HtmlBuilder;
+
+class HtmlElement
+{
+    friend struct HtmlBuilder;
+    string name;
+    string text;
+    vector<HtmlElement> elements;
+    const size_t indent_size = 2;
+
+    HtmlElement() = default;
+
+    HtmlElement(const string &n, const string &t) : name{n}, text{t} {}
+
+public:
+
+    string str(int indent = 0) const
+    {
+        ostringstream oss;
+        string i(indent_size * indent, ' ');
+        oss << i << "<" << name << ">" << endl;
+        if (!text.empty())
+        {
+            oss << string(indent_size * (indent + 1), ' ') << text << endl;
+        }
+
+        for (const auto &item: elements)
+        {
+            oss << item.str(indent + 1);
+        }
+        oss << i << "</" << name << ">" << endl;
+        return oss.str();
+    }
+
+//    static HtmlBuilder build(string root_name)
+//    {
+//        return {root_name};
+//    }
+
+    static unique_ptr<HtmlBuilder> create(string root_name)
+    {
+        return make_unique<HtmlBuilder>(root_name);
+    }
+};
+
+class HtmlBuilder
+{
+    HtmlElement root;
+
+public:
+
+    explicit HtmlBuilder(const string &root_name)
+    {
+        root.name = root_name;
+    }
+
+    HtmlBuilder &add_element(const string &child_name, const string &child_text)
+    {
+        HtmlElement e{child_name, child_text};
+        root.elements.emplace_back(e);
+        return *this;
+    }
+
+    string str() const { return root.str(); }
+
+    HtmlElement build()
+    {
+        return root;
+    }
+
+    operator HtmlElement() const
+    {
+        return root;
+    }
+};
+
+int main()
+{
+    HtmlBuilder builder{"ul"};
+    builder.add_element("li", "Hello");
+    builder.add_element("li", "World!");
+    cout << builder.str() << endl;
+
+    HtmlBuilder builder1{"ul"};
+    builder1
+            .add_element("li", "Hello")
+            .add_element("li", "World");
+
+    cout << builder1.str() << endl;
+
+//    auto builder2 = HtmlElement::build("ul").add_element("li", "Hello").add_element("li", "World");
+//    cout << builder2.str() << endl;
+//
+//    HtmlElement elem = HtmlElement::build("ul").add_element("li", "Hello");
+
+    auto bilder = HtmlElement::create("ul")->
+            add_element("li", "Hello")
+            .add_element("li", "World")
+            .build();
+    cout << bilder.str() << endl;
+
+//    HtmlElement
+
+    return 0;
+}

Udemy/builder/src/motivation_demo.cpp

@@ -0,0 +1,33 @@
+//
+// Created by sajith on 6/10/22.
+//
+
+#include <iostream>
+#include <string>
+#include <sstream>
+
+using namespace std;
+
+int main()
+{
+    auto text = "hello";
+    string output;
+    output += "<p>";
+    output += text;
+    output += "</p>";
+
+    cout << output << endl;
+
+    string words[] = {"hello", "world"};
+    ostringstream oss;
+
+    oss << "<ul>\n";
+    for (const auto &word: words)
+    {
+        oss << " <li> " << word << " </li>  \n";
+    }
+    oss << "</ul>";
+
+    cout << oss.str() << endl;
+    return 0;
+}

Udemy/builder/src/motivation_improved_v1.cpp

@@ -0,0 +1,68 @@
+//
+// Created by sajith on 6/10/22.
+//
+
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+
+using namespace std;
+
+struct HtmlElement
+{
+    string name;
+    string text;
+    vector<HtmlElement> elements;
+    const size_t indent_size = 2;
+
+    HtmlElement() = default;
+
+    HtmlElement(const string &n, const string &t) : name{n}, text{t} {}
+
+    string str(int indent = 0) const
+    {
+        ostringstream oss;
+        string i(indent_size * indent, ' ');
+        oss << i << "<" << name << ">" << endl;
+        if (!text.empty())
+        {
+            oss << string(indent_size * (indent + 1), ' ') << text << endl;
+        }
+
+        for (const auto &item: elements)
+        {
+            oss << item.str(indent + 1);
+        }
+        oss << i << "</" << name << ">" << endl;
+        return oss.str();
+    }
+};
+
+struct HtmlBuilder
+{
+    HtmlElement root;
+
+    HtmlBuilder(const string &root_name)
+    {
+        root.name = root_name;
+    }
+
+    void add_element(const string &child_name, const string &child_text)
+    {
+        HtmlElement e{child_name, child_text};
+        root.elements.emplace_back(e);
+    }
+
+    string str() const { return root.str(); }
+};
+
+int main()
+{
+    HtmlBuilder builder{"ul"};
+    builder.add_element("li", "Hello");
+    builder.add_element("li", "World!");
+
+    cout << builder.str() << endl;
+    return 0;
+}