add lexer, parser, and ast tree

src/ast/call_expression_ast.h

@@ -0,0 +1,34 @@
+#ifndef OBELISK_AST_CALL_EXPRESSION_AST_H
+#define OBELISK_AST_CALL_EXPRESSION_AST_H
+
+#include "ast/expression_ast.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace obelisk
+{
+    class CallExpressionAST : public ExpressionAST
+    {
+        private:
+            std::string callee_;
+            std::vector<std::unique_ptr<ExpressionAST>> args_;
+
+            std::string getCallee();
+            void setCallee(std::string callee);
+
+            std::vector<std::unique_ptr<ExpressionAST>> getArgs();
+            void setArgs(std::vector<std::unique_ptr<ExpressionAST>> args);
+
+        public:
+            CallExpressionAST(const std::string &callee,
+                std::vector<std::unique_ptr<ExpressionAST>> args) :
+                callee_(callee),
+                args_(std::move(args))
+            {
+            }
+    };
+} // namespace obelisk
+
+#endif

src/ast/expression_ast.h

@@ -0,0 +1,13 @@
+#ifndef OBELISK_AST_EXPRESSION_AST_H
+#define OBELISK_AST_EXPRESSION_AST_H
+
+namespace obelisk
+{
+    class ExpressionAST
+    {
+        public:
+            virtual ~ExpressionAST() = default;
+    };
+} // namespace obelisk
+
+#endif

src/ast/function_ast.h

@@ -0,0 +1,30 @@
+#ifndef OBELISK_AST_FUNCTION_AST_H
+#define OBELISK_AST_FUNCTION_AST_H
+
+#include "ast/expression_ast.h"
+#include "ast/prototype_ast.h"
+
+#include <memory>
+
+namespace obelisk
+{
+    class FunctionAST
+    {
+        private:
+            std::unique_ptr<PrototypeAST> prototype_;
+            std::unique_ptr<ExpressionAST> body_;
+
+            std::unique_ptr<PrototypeAST> getPrototype();
+            void setPrototype(std::unique_ptr<PrototypeAST> prototype);
+
+        public:
+            FunctionAST(std::unique_ptr<PrototypeAST> prototype,
+                std::unique_ptr<ExpressionAST> body) :
+                prototype_(std::move(prototype)),
+                body_(std::move(body))
+            {
+            }
+    };
+} // namespace obelisk
+
+#endif

src/ast/meson.build

@@ -0,0 +1,8 @@
+obelisk_ast_sources = files(
+    'call_expression_ast.h',
+    'expression_ast.h',
+    'function_ast.h',
+    'number_expression_ast.h',
+    'prototype_ast.h',
+    'variable_expression_ast.h'
+)

src/ast/number_expression_ast.h

@@ -0,0 +1,24 @@
+#ifndef OBELISK_AST_NUMBER_EXPRESSION_AST_H
+#define OBELISK_AST_NUMBER_EXPRESSION_AST_H
+
+#include "ast/expression_ast.h"
+
+namespace obelisk
+{
+    class NumberExpressionAST : public ExpressionAST
+    {
+        private:
+            double number_;
+
+            double getNumber();
+            void setNumber(double number);
+
+        public:
+            NumberExpressionAST(double number) :
+                number_(number)
+            {
+            }
+    };
+} // namespace obelisk
+
+#endif

src/ast/prototype_ast.h

@@ -0,0 +1,34 @@
+#ifndef OBELISK_AST_PROTOTYPE_AST_H
+#define OBELISK_AST_PROTOTYPE_AST_H
+
+#include <string>
+#include <vector>
+
+namespace obelisk
+{
+    class PrototypeAST
+    {
+        private:
+            std::string name_;
+            std::vector<std::string> args_;
+
+            void setName(const std::string& name);
+            std::vector<std::string> getArgs();
+            void setArgs(std::vector<std::string> args);
+
+        public:
+            PrototypeAST(const std::string& name,
+                std::vector<std::string> args) :
+                name_(name),
+                args_(std::move(args))
+            {
+            }
+
+            const std::string& getName() const
+            {
+                return name_;
+            }
+    };
+} //namespace obelisk
+
+#endif

src/ast/variable_expression_ast.h

@@ -0,0 +1,25 @@
+#ifndef OBELISK_AST_VARIABLE_EXPRESSION_AST_H
+#define OBELISK_AST_VARIABLE_EXPRESSION_AST_H
+
+#include "ast/expression_ast.h"
+
+#include <string>
+
+namespace obelisk
+{
+    class VariableExpressionAST : public ExpressionAST
+    {
+        private:
+            std::string name_;
+            std::string getName();
+            void setName(const std::string name);
+
+        public:
+            VariableExpressionAST(const std::string &name) :
+                name_(name)
+            {
+            }
+    };
+} //namespace obelisk
+
+#endif