Started tidying ast namespace.

Author: nos1dot618

include/lbd/frontend/ast/Ast.hpp

@@ -12,7 +12,6 @@ namespace lbd::frontend::ast
 {
     struct IdentifierAstNode
     {
-        // TODO: This can be a std::string_view.
         std::string value;
         source::Location location;
 

include/lbd/frontend/ast/AstNode.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <lbd/frontend/ast/AstNodeKind.hpp>
+#include <lbd/source/Range.hpp>
+
+namespace lbd::frontend::ast
+{
+    class AstNode
+    {
+    public:
+        AstNode(AstNodeKind kind, source::Range range);
+        virtual ~AstNode() = default;
+
+        virtual void print(std::ostream& outputStream, size_t indent) const noexcept = 0;
+        friend std::ostream& operator<<(std::ostream& outputStream, const AstNode& node);
+
+    private:
+        const AstNodeKind kind;
+        const source::Range range;
+
+    protected:
+        static void printIndent(std::ostream& outputStream, size_t indent) noexcept;
+    };
+}

include/lbd/frontend/ast/AstNodeKind.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+namespace lbd::frontend::ast
+{
+    enum class AstNodeKind
+    {
+        IDENTIFIER_EXPRESSION,
+        STRING_EXPRESSION,
+        NUMBER_EXPRESSION,
+        LAMBDA_EXPRESSION,
+        FUNCTION_APPLICATION_EXPRESSION,
+        SYMBOL_DEFINITION,
+        EXPRESSION_STATEMENT,
+        SYMBOL_DEFINITION_STATEMENT,
+    };
+}

include/lbd/frontend/ast/expression/Expression.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <lbd/frontend/ast/AstNode.hpp>
+
+namespace lbd::frontend::ast::expression
+{
+    class Expression : public AstNode
+    {
+        using AstNode::AstNode;
+    };
+}

include/lbd/frontend/ast/expression/IdentifierExpression.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <lbd/frontend/ast/expression/Expression.hpp>
+
+namespace lbd::frontend::ast::expression
+{
+    class IdentifierExpression final : Expression
+    {
+    public:
+        IdentifierExpression(const source::Range& range, std::string name);
+
+        void print(std::ostream& outputStream, size_t indent) const noexcept override;
+
+    private:
+        std::string name;
+    };
+}

include/lbd/frontend/ast/expression/StringExpression.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <lbd/frontend/ast/expression/Expression.hpp>
+
+namespace lbd::frontend::ast::expression
+{
+    class StringExpression final : Expression
+    {
+    public:
+        StringExpression(const source::Range& range, std::string value);
+
+        void print(std::ostream& outputStream, size_t indent) const noexcept override;
+
+    private:
+        std::string value;
+    };
+}

src/frontend/ast/AstNode.cpp

@@ -0,0 +1,17 @@
+#include <lbd/frontend/ast/AstNode.hpp>
+
+namespace lbd::frontend::ast
+{
+    AstNode::AstNode(const AstNodeKind kind, const source::Range range) : kind(kind), range(range) {}
+
+    std::ostream& operator<<(std::ostream& outputStream, const AstNode& node)
+    {
+        node.print(outputStream, 0);
+        return outputStream;
+    }
+
+    void AstNode::printIndent(std::ostream& outputStream, const size_t indent) noexcept
+    {
+        for (size_t i = 0; i < indent; ++i) outputStream << "    ";
+    }
+}

src/frontend/ast/expression/IdentifierExpression.cpp

@@ -0,0 +1,13 @@
+#include <lbd/frontend/ast/expression/IdentifierExpression.hpp>
+
+namespace lbd::frontend::ast::expression
+{
+    IdentifierExpression::IdentifierExpression(const source::Range& range, std::string name)
+        : Expression(AstNodeKind::IDENTIFIER_EXPRESSION, range), name(std::move(name)) {}
+
+    void IdentifierExpression::print(std::ostream& outputStream, const size_t indent) const noexcept
+    {
+        printIndent(outputStream, indent);
+        outputStream << name;
+    }
+}

src/frontend/ast/expression/StringExpression.cpp

@@ -0,0 +1,13 @@
+#include <lbd/frontend/ast/expression/StringExpression.hpp>
+
+namespace lbd::frontend::ast::expression
+{
+    StringExpression::StringExpression(const source::Range& range, std::string value)
+        : Expression(AstNodeKind::STRING_EXPRESSION, range), value(std::move(value)) {}
+
+    void StringExpression::print(std::ostream& outputStream, const size_t indent) const noexcept
+    {
+        printIndent(outputStream, indent);
+        outputStream << '\"' << value << '\"';
+    }
+}