Parse variable declarations

CMakeLists.txt

@@ -18,6 +18,7 @@ add_flex_bison_dependency(lexer parser)
 add_executable(elna cli/main.cpp
 	source/ast.cpp include/elna/source/ast.hpp
 	source/types.cpp include/elna/source/types.hpp
+	source/driver.cpp include/elna/source/driver.hpp
 	source/result.cpp include/elna/source/result.hpp
 	${BISON_parser_OUTPUTS} ${FLEX_lexer_OUTPUTS}
 )

cli/main.cpp

@@ -1,22 +1,37 @@
+#include <elna/source/driver.hpp>
 #include "parser.hpp"
 #include <sstream>
 
 int main()
 {
-    std::istringstream inp("const world = 5, hello = 7;");
+    elna::source::driver driver{ "-" };
+    std::istringstream inp(R"(
+        const world = 5, hello = 7;
+        var x: int;
+        begin
+        end.
+    )");
 
-    std::unique_ptr<elna::source::program> program;
+    elna::source::lexer lexer(inp);
+    yy::parser parser(lexer, driver);
     
-    elna::syntax::FooLexer lexer(inp);
+    if (auto result = parser())
-    yy::parser parser(lexer, program);
+    {
-    auto result = parser();
+        for (const auto& error : driver.errors())
-
+        {
-    for (auto& definition : program->definitions())
+            std::cerr << error->path().string() << ':'
+                << error->line() << ':' << error->column()
+                << ": error: " << error->what()
+                << '.' << std::endl;
+        }
+        return result;
+    }
+    for (auto& definition : driver.tree->definitions())
     {
         auto const_definition = dynamic_cast<elna::source::constant_definition *>(definition.get());
 
         std::cout << "const " << const_definition->identifier() << " = "
             << const_definition->body().number() << std::endl;
     }
-    return result;
+    return 0;
 }

include/elna/source/driver.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <list>
+#include "elna/source/ast.hpp"
+#include "location.hh"
+
+namespace elna::source
+{
+    position make_position(const yy::location& location);
+
+    class syntax_error final : public error
+    {
+        std::string message;
+
+    public:
+        syntax_error(const std::string& message,
+                const std::filesystem::path& input_file, const yy::location& location);
+
+        virtual std::string what() const override;
+    };
+
+    class driver
+    {
+        std::list<std::unique_ptr<struct error>> m_errors;
+        const std::filesystem::path input_file;
+
+    public:
+        std::unique_ptr<program> tree;
+
+        driver(const std::filesystem::path& input_file);
+
+        void error(const yy::location& loc, const std::string& message);
+        const std::list<std::unique_ptr<struct error>>& errors() const noexcept;
+    };
+}

source/driver.cpp

@@ -0,0 +1,38 @@
+#include "elna/source/driver.hpp"
+
+namespace elna::source
+{
+    position make_position(const yy::location& location)
+    {
+        return position{
+            static_cast<std::size_t>(location.begin.line),
+            static_cast<std::size_t>(location.begin.column)
+        };
+    }
+
+    syntax_error::syntax_error(const std::string& message,
+            const std::filesystem::path& input_file, const yy::location& location)
+        : error(input_file, make_position(location)), message(message)
+    {
+    }
+
+    std::string syntax_error::what() const
+    {
+        return message;
+    }
+
+    driver::driver(const std::filesystem::path& input_file)
+        : input_file(input_file)
+    {
+    }
+
+    void driver::error(const yy::location& loc, const std::string& message)
+    {
+        m_errors.emplace_back(std::make_unique<elna::source::syntax_error>(message, input_file, loc));
+    }
+
+    const std::list<std::unique_ptr<struct error>>& driver::errors() const noexcept
+    {
+        return m_errors;
+    }
+}

source/lexer.ll

@@ -6,12 +6,12 @@
 #include "parser.hpp"
 
 #undef YY_DECL
-#define YY_DECL yy::parser::symbol_type elna::syntax::FooLexer::lex()
+#define YY_DECL yy::parser::symbol_type elna::source::lexer::lex()
 #define yyterminate() return yy::parser::make_YYEOF(this->location)
 %}
 
 %option c++ noyywrap never-interactive
-%option yyclass="elna::syntax::FooLexer"
+%option yyclass="elna::source::lexer"
 
 %%
 %{
@@ -125,7 +125,7 @@ False                   {
 .                       {
                             std::stringstream ss;
 
-                            ss << "Illegal character 0x" << std::hex << static_cast<unsigned char>(yytext[0]);
+                            ss << "Illegal character 0x" << std::hex << static_cast<unsigned int>(yytext[0]);
                             throw yy::parser::syntax_error(this->location, ss.str());
                         }
 %%

source/parser.yy

@@ -4,29 +4,28 @@
 %code requires {
     #include <cstdint>
     #include <iostream>
-    #include "elna/source/ast.hpp"
+    #include "elna/source/driver.hpp"
-
 
     #if !defined(yyFlexLexerOnce)
         #include <FlexLexer.h>
     #endif
 
-    namespace elna::syntax
+    namespace elna::source
     {
-    class FooLexer;
+    class lexer;
     }
 }
 
 %code provides {
-    namespace elna::syntax
+    namespace elna::source
     {
 
-    class FooLexer : public yyFlexLexer
+    class lexer: public yyFlexLexer
     {
     public:
         yy::location location;
 
-        FooLexer(std::istream& arg_yyin)
+        lexer(std::istream& arg_yyin)
             : yyFlexLexer(&arg_yyin)
         {
         }
@@ -42,8 +41,8 @@
 %define api.value.type variant
 %define parse.assert
 
-%parse-param {elna::syntax::FooLexer& lexer}
+%parse-param {elna::source::lexer& lexer}
-%parse-param {std::unique_ptr<elna::source::program>& program}
+%parse-param {elna::source::driver& driver}
 %locations
 
 %header
@@ -68,12 +67,13 @@
 %type <std::unique_ptr<elna::source::integer_literal>> integer_literal;
 %type <std::unique_ptr<elna::source::constant_definition>> constant_definition;
 %type <std::vector<std::unique_ptr<elna::source::constant_definition>>> constant_definition_part constant_definitions;
+%type <std::unique_ptr<elna::source::declaration>> variable_declaration;
+%type <std::vector<std::unique_ptr<elna::source::declaration>>> variable_declarations variable_declaration_part;
 %type <std::unique_ptr<elna::source::type_expression>> type_expression;
+%type <std::unique_ptr<elna::source::statement>> statement;
 %%
-program: constant_definition_part
+program: constant_definition_part variable_declaration_part statement DOT
         {
-            elna::source::position position;
-            std::vector<std::unique_ptr<elna::source::declaration>> declarations;
             std::vector<std::unique_ptr<elna::source::definition>> definitions($1.size());
             std::vector<std::unique_ptr<elna::source::definition>>::iterator definition = definitions.begin();
 
@@ -81,46 +81,45 @@ program: constant_definition_part
             {
                 *definition++ = std::move(constant);
             }
-            program = std::make_unique<elna::source::program>(position,
+            driver.tree = std::make_unique<elna::source::program>(elna::source::position{},
-                 std::move(definitions), std::move(declarations),
+                 std::move(definitions), std::move($2),
-                 std::make_unique<elna::source::compound_statement>(position));
+                 std::move($3));
         }
 integer_literal: NUMBER
         {
-            elna::source::position position{
+            $$ = std::make_unique<elna::source::integer_literal>(elna::source::make_position(@1), $1); 
-                static_cast<std::size_t>(@1.begin.line),
-                static_cast<std::size_t>(@1.begin.column)
         };
-            $$ = std::make_unique<elna::source::integer_literal>(position, $1); 
+statement: BEGIN_BLOCK END_BLOCK
+        {
+            $$ = std::make_unique<elna::source::compound_statement>(elna::source::make_position(@1));
         };
 type_expression:
         HAT IDENTIFIER
             {
-                elna::source::position position{
+                $$ = std::make_unique<elna::source::type_expression>(elna::source::make_position(@1), $2, true);
-                    static_cast<std::size_t>(@1.begin.line),
-                    static_cast<std::size_t>(@1.begin.column)
-                };
-                $$ = std::make_unique<elna::source::type_expression>(position, $2, true);
             }
         | IDENTIFIER
             {
-                elna::source::position position{
+                $$ = std::make_unique<elna::source::type_expression>(elna::source::make_position(@1), $1, false);
-                    static_cast<std::size_t>(@1.begin.line),
-                    static_cast<std::size_t>(@1.begin.column)
-                };
-                $$ = std::make_unique<elna::source::type_expression>(position, $1, false);
             }
 variable_declaration: IDENTIFIER COLON type_expression
+        {
+            $$ = std::make_unique<elna::source::declaration>(elna::source::make_position(@1),
+                $1, std::move($3)); 
+        };
 variable_declarations:
     variable_declaration COMMA variable_declarations
-        | variable_declaration
+        {
+            std::swap($$, $3);
+            $$.emplace($$.cbegin(), std::move($1));
+        }
+    | variable_declaration { $$.emplace_back(std::move($1)); }
+variable_declaration_part:
+    /* no variable declarations */ {}
+    | VAR variable_declarations SEMICOLON { std::swap($$, $2); }
 constant_definition: IDENTIFIER EQUALS integer_literal
         {
-            elna::source::position position{
+            $$ = std::make_unique<elna::source::constant_definition>(elna::source::make_position(@1),
-                static_cast<std::size_t>(@1.begin.line),
-                static_cast<std::size_t>(@1.begin.column)
-            };
-            $$ = std::make_unique<elna::source::constant_definition>(position,
                 $1, std::move($3)); 
         };
 constant_definitions:
@@ -137,5 +136,5 @@ constant_definition_part:
 
 void yy::parser::error(const location_type& loc, const std::string& message)
 {
-    std::cerr << "Error: " << message << std::endl;
+    driver.error(loc, message);
 }