3 feature support for parsing xml document

src/document.cpp

@@ -0,0 +1,95 @@
+#include <set>
+#include "document.hpp"
+#include "parser.hpp"
+
+namespace myxml
+{
+    void Document::SetDeclaration(const Declaration &declaration)
+    {
+        this->declaration = declaration;
+    }
+
+    void Document::SetRoot(std::shared_ptr<Element> root)
+    {
+        this->root = root;
+    }
+
+    const Declaration &Document::GetDeclartion() const
+    {
+        return this->declaration;
+    }
+
+    Declaration &Document::GetDeclartion()
+    {
+        return this->declaration;
+    }
+
+    const std::shared_ptr<Element> &Document::GetRoot() const
+    {
+        return this->root;
+    }
+
+    std::shared_ptr<Element> Document::GetRoot()
+    {
+        return this->root;
+    }
+
+    std::optional<Document> Document::Parse(std::string input)
+    {
+        return Parser(input).ParseDocument();
+    }
+
+    std::optional<Declaration> Declaration::BuildFromAttrs(std::map<std::string, std::string> attrs)
+    {
+        if (!attrs.count("version") || !util::isValidXmlVersion(attrs["version"]))
+        {
+            return std::nullopt;
+        }
+        Declaration declaration;
+        declaration.version = attrs["version"];
+        if (attrs.count("encoding"))
+        {
+            auto encoding = attrs["encoding"];
+            if (!util::isValidXmlEncoding(encoding))
+            {
+                return std::nullopt;
+            }
+            declaration.encoding = encoding;
+        }
+        if (attrs.count("standalone"))
+        {
+            auto standalone = attrs["standalone"];
+            if (!util::isValidXmlStandalone(standalone))
+            {
+                return std::nullopt;
+            }
+            declaration.standalone = standalone;
+        }
+        return declaration;
+    }
+
+    namespace util
+    {
+        bool isValidXmlVersion(std::string_view version)
+        {
+            return version == "1.0" || version == "1.1";
+        }
+
+        bool isValidXmlEncoding(std::string_view encoding)
+        {
+            // FIXME: not cover all valid encoding
+            static std::set<std::string, std::less<>> valid{
+                "UTF-8",
+                "UTF-16",
+                "UTF-32",
+                "GBK",
+            };
+            return valid.count(encoding);
+        }
+
+        bool isValidXmlStandalone(std::string_view standalone)
+        {
+            return standalone == "yes" || standalone == "no";
+        }
+    }
+}

src/document.hpp

@@ -1,5 +1,45 @@
 #pragma once
+#include <map>
+#include "node.hpp"
 
-class XMLDocument
+// Declaration and Documant are both NOT Node
+namespace myxml
 {
-};
+    struct Declaration
+    {
+        std::string version;
+        std::optional<std::string> encoding;
+        std::optional<std::string> standalone;
+
+        // return `std::nullopt` if declartion is in bad format
+        // TODO: use exception to distinguish each of bad format
+        static std::optional<Declaration> BuildFromAttrs(std::map<std::string, std::string> attrs);
+    };
+
+    class Document
+    {
+    private:
+        Declaration declaration;
+        std::shared_ptr<Element> root;
+
+    public:
+        /* Manipulate */
+        void SetDeclaration(const Declaration &);
+        void SetRoot(std::shared_ptr<Element> root);
+
+        /* Query */
+        const Declaration &GetDeclartion() const;
+        Declaration &GetDeclartion();
+        const std::shared_ptr<Element> &GetRoot() const;
+        std::shared_ptr<Element> GetRoot();
+
+        static std::optional<Document> Parse(std::string);
+    };
+
+    namespace util
+    {
+        bool isValidXmlVersion(std::string_view);
+        bool isValidXmlEncoding(std::string_view);
+        bool isValidXmlStandalone(std::string_view);
+    }
+}

src/element.cpp

@@ -21,41 +21,6 @@ namespace myxml
         return Parser(buf).ParseElement().value();
     }
 
-    std::shared_ptr<Node> Element::FirstChild()
-    {
-        return this->firstChild;
-    }
-
-    std::shared_ptr<Element> Element::Elem(std::string_view name)
-    {
-        if (auto buf = this->nameToElemBuffer.find(name); buf != this->nameToElemBuffer.end())
-        {
-            std::weak_ptr<Element> ptr = buf->second;
-            if (auto child = ptr.lock(); child != nullptr)
-            {
-                return child;
-            }
-            else
-            {
-                this->nameToElemBuffer.erase(buf);
-            }
-        }
-        for (auto child = this->firstChild; child != nullptr; child = child->next)
-        {
-            if (auto elem = child->AsElement(); elem && (*elem)->name == name)
-            {
-                this->nameToElemBuffer.emplace(name, *elem);
-                return *elem;
-            }
-        }
-        return nullptr;
-    }
-
-    std::shared_ptr<Node> Element::LastChild()
-    {
-        return this->lastChild;
-    }
-
     std::optional<std::string_view> Element::GetAttribute(std::string_view name)
     {
         if (auto attr = this->attributes.find(name); attr != this->attributes.end())
@@ -73,75 +38,6 @@ namespace myxml
         return this->name;
     }
 
-    std::shared_ptr<Node> Element::InsertAtFront(const std::shared_ptr<Node> &elem)
-    {
-        if (elem->parent != nullptr)
-        {
-            elem->parent->Unlink(elem);
-        }
-        elem->parent = this->shared_from_this();
-        if (this->firstChild == nullptr)
-        {
-            this->firstChild = elem;
-            this->lastChild = elem;
-        }
-        else
-        {
-            this->firstChild->prev = elem;
-            elem->next = this->firstChild;
-            this->firstChild = elem;
-        }
-        return elem;
-    }
-
-    std::shared_ptr<Node> Element::InsertAtEnd(const std::shared_ptr<Node> &elem)
-    {
-        if (elem->parent != nullptr)
-        {
-            elem->parent->Unlink(elem);
-        }
-        elem->parent = this->shared_from_this();
-        if (this->firstChild == nullptr)
-        {
-            this->firstChild = elem;
-            this->lastChild = elem;
-        }
-        else
-        {
-            this->lastChild->next = elem;
-            elem->prev = this->lastChild;
-            this->lastChild = elem;
-        }
-        return elem;
-    }
-
-    void Element::Unlink(const std::shared_ptr<Node> &elem)
-    {
-        if (elem->parent.get() != this)
-        {
-            return;
-        }
-        if (elem == this->firstChild)
-        {
-            this->firstChild = this->firstChild->next;
-        }
-        if (elem == this->lastChild)
-        {
-            this->lastChild = this->lastChild->prev;
-        }
-        if (elem->prev != nullptr)
-        {
-            elem->prev->next = elem->next;
-        }
-        if (elem->next != nullptr)
-        {
-            elem->next->prev = elem->prev;
-        }
-        elem->next = nullptr;
-        elem->prev = nullptr;
-        elem->parent = nullptr;
-    }
-
     void Element::SetName(std::string_view name)
     {
         this->name = name;
@@ -185,13 +81,13 @@ namespace myxml
         {
             builder += "" + key + "=\"" + value + "\"";
         }
-        if (this->firstChild == nullptr)
+        if (this->FirstChild() == nullptr)
         {
             builder += " />";
             return builder;
         }
         builder += ">";
-        for (auto node = this->firstChild; node != nullptr; node = node->next)
+        for (auto node = this->FirstChild(); node != nullptr; node = node->next)
         {
             builder += node->ExportRaw();
         }
@@ -207,13 +103,13 @@ namespace myxml
         {
             builder += "" + key + "=\"" + value + "\"";
         }
-        if (this->firstChild == nullptr)
+        if (this->FirstChild() == nullptr)
         {
             builder += " />\n";
             return builder;
         }
         builder += ">\n";
-        for (auto node = this->firstChild; node != nullptr; node = node->next)
+        for (auto node = this->FirstChild(); node != nullptr; node = node->next)
         {
             builder += node->ExportFormatted(indentLevel + 1, indentSize);
         }

src/element.hpp

@@ -9,7 +9,7 @@
 
 namespace myxml
 {
-    class Element : public std::enable_shared_from_this<Element>, public Node
+    class Element : public CompositeNode // public std::enable_shared_from_this<Element>, public Node
     {
     public:
         enum class ClosingType
@@ -19,19 +19,13 @@ namespace myxml
         };
 
     private:
-        // list node
-        // std::shared_ptr<Element> parent;
-        // std::shared_ptr<Node> next;
-        // std::shared_ptr<Node> prev;
-
-        // element
-        std::shared_ptr<Node> firstChild;
-        std::shared_ptr<Node> lastChild;
+        // std::shared_ptr<Node> firstChild;
+        // std::shared_ptr<Node> lastChild;
         std::string name;
         std::map<std::string, std::string, std::less<>> attributes;
-        std::map<std::string, std::weak_ptr<Element>, std::less<>> nameToElemBuffer;
+        // std::map<std::string, std::weak_ptr<Element>, std::less<>> nameToElemBuffer;
 
-        // Initializer
+        /* Set nitializer as private to avoid using Element without share_ptr*/
         Element(std::string_view name);
         Element() = default;
 
@@ -43,16 +37,10 @@ namespace myxml
         static std::shared_ptr<Element> Parse(std::string_view buf);
 
         /* Query */
-        std::shared_ptr<Node> FirstChild();
-        std::shared_ptr<Node> LastChild();
-        std::shared_ptr<Element> Elem(std::string_view name);
         std::optional<std::string_view> GetAttribute(std::string_view name);
         std::string_view GetName() const;
 
         /* Manipulate */
-        std::shared_ptr<Node> InsertAtFront(const std::shared_ptr<Node> &);
-        std::shared_ptr<Node> InsertAtEnd(const std::shared_ptr<Node> &);
-        void Unlink(const std::shared_ptr<Node> &);
         void SetName(std::string_view);
         void SetAttribute(std::string key, std::string value);
         void ExtendAttributes(std::map<std::string, std::string>);