feat(furc): add compound statement

This one: { [statement]... }

compile_commands.json

@@ -0,0 +1 @@
+build/compile_commands.json

furc/include/furc/ast/declaration.hpp

@@ -11,7 +11,6 @@ namespace ast {
 enum class declaration_node_t {
     FunctionDeclaration,
     FunctionDefinition,
-    Variable,
 };
 
 class declaration_node : public statement_node {

furc/include/furc/ast/fwd.hpp

@@ -63,6 +63,8 @@ class return_statement_node;
 using return_statement_node_h = node_handle<return_statement_node>;
 class if_statement_node;
 using if_statement_node_h = node_handle<if_statement_node>;
+class compound_statement_node;
+using compound_statement_node_h = node_handle<compound_statement_node>;
 
 } // namespace ast
 } // namespace furc

furc/include/furc/ast/statement.hpp

@@ -11,6 +11,7 @@ enum class statement_node_t {
     Declaration,
     Return,
     If,
+    Compound,
 };
 
 class statement_node : public node {
@@ -67,6 +68,24 @@ private:
     statement_node_h  m_else;
 };
 
+class compound_statement_node : public statement_node {
+public:
+    compound_statement_node(body_h&& body)
+      : m_body(std::move(body)) {}
+public:
+    const body_h& body() const { return m_body; }
+public:
+    statement_node_t statement_type() const override { return statement_node_t::Compound; }
+public:
+    void accept(visitor& visitor) const override;
+
+    std::ostream& print(std::ostream& os) const override;
+protected:
+    bool equal(const node& rhs) const override;
+private:
+    body_h m_body;
+};
+
 } // namespace ast
 } // namespace furc
 

furc/include/furc/ast/visitor.hpp

@@ -26,6 +26,7 @@ public:
     virtual void visit_function_definition_node(const function_definition_node&) {}
     virtual void visit_return_statement_node(const return_statement_node&) {}
     virtual void visit_if_statement_node(const if_statement_node&) {}
+    virtual void visit_compound_statement_node(const compound_statement_node&) {}
 
     virtual void visit_error(const node_handle<node>& handle) {}
 };

furc/include/furc/front/ir_generator.hpp

@@ -23,6 +23,7 @@ public:
     void visit_function_definition_node(const ast::function_definition_node& funcDef) override;
     void visit_return_statement_node(const ast::return_statement_node& returnStmt) override;
     void visit_if_statement_node(const ast::if_statement_node& node) override;
+    void visit_compound_statement_node(const ast::compound_statement_node& node) override;
     void visit_string_literal_node(const ast::string_literal_node& node) override;
     void visit_integer_literal_node(const ast::integer_literal_node& node) override;
     void visit_var_read_expression_node(const ast::var_read_expression_node& node) override;

furc/src/ast.cpp

@@ -204,6 +204,18 @@ bool if_statement_node::equal(const node& rhsNode) const {
     return statement_node::equal(rhs) && m_cond == rhs.m_cond && m_then == rhs.m_then && m_else == rhs.m_else;
 }
 
+void compound_statement_node::accept(visitor& visitor) const {
+    visitor.visit_compound_statement_node(*this);
+}
+
+std::ostream& compound_statement_node::print(std::ostream& os) const {
+    return os << m_body;
+}
+
+bool compound_statement_node::equal(const node& rhs) const {
+    return statement_node::equal(rhs) && m_body == reinterpret_cast<const compound_statement_node&>(rhs).m_body;
+}
+
 void program_node::accept(visitor& visitor) const {
     for (const auto& decl : m_declarations) {
         if (decl.has_error()) {

furc/src/front/ir_generator.cpp

@@ -60,6 +60,12 @@ void ir_generator::visit_if_statement_node(const ast::if_statement_node& node) {
     push_block();
 }
 
+void ir_generator::visit_compound_statement_node(const ast::compound_statement_node& node) {
+    for (const auto& stmt : node.body()->statements) {
+        stmt->accept(*this);
+    }
+}
+
 void ir_generator::visit_string_literal_node(const ast::string_literal_node& node) {
     m_currentBlock->emplace<furlang::ir::assign_instruction>(ir::operand::new_string(std::string(*node.value())),
         ir::operand::new_reg(m_registerCounter++));

furc/src/front/parser.cpp

@@ -89,6 +89,7 @@ ast::declaration_node_h parser::parse_declaration() {
 ast::statement_node_h parser::parse_statement() {
     const auto& tok = peek_token();
     if (tok.has_error()) return tok;
+    auto location = tok.location();
     switch (tok->type) {
     case token_t::Keyword: {
         switch (tok->value.keyword) {
@@ -121,20 +122,21 @@ ast::statement_node_h parser::parse_statement() {
                 peek_token()->value.keyword == keyword_token::Else) {
                 next_token();
 
-                return ast::if_statement_node_h{ tok.location(),
+                return ast::if_statement_node_h{ location,
                     m_arena,
                     std::move(cond),
                     std::move(then),
                     std::move(parse_statement()) };
             }
 
-            return ast::if_statement_node_h{ tok.location(), m_arena, std::move(cond), std::move(then) };
+            return ast::if_statement_node_h{ location, m_arena, std::move(cond), std::move(then) };
         }
         case keyword_token::None:
         case keyword_token::Func:
         default: break;
         }
     }
+    case token_t::Lbrace: return ast::compound_statement_node_h{ location, m_arena, parse_body() };
     default: break;
     }
 

furc/src/main.cpp

@@ -6,7 +6,21 @@
 #include <iostream>
 
 int main(void) {
-    furc::front::parser       parser("<TEMP>", "func main() {\n    if (1) return 7 + 6 * 10; else return 0;\n}");
+    std::string               programStr = R"(
+    func main() {
+        x = 5;
+        x -= 3;
+        if (x < 3) {
+            y = x * 2;
+            w = y;
+        } else {
+            y = x - 3;
+        }
+        w = x - y;
+        z = x + y;
+    }
+    )";
+    furc::front::parser       parser("<TEMP>", programStr);
     furc::front::ir_generator generator;
 
     auto program = parser.parse();