parsing enum declarations

src/parser.cpp

@@ -144,6 +144,10 @@ const char *node_type_str(NodeType node_type) {
             return "StructDecl";
         case NodeTypeStructField:
             return "StructField";
+        case NodeTypeEnumDecl:
+            return "EnumDecl";
+        case NodeTypeEnumField:
+            return "EnumField";
         case NodeTypeStructValueExpr:
             return "StructValueExpr";
         case NodeTypeStructValueField:
@@ -429,6 +433,24 @@ void ast_print(AstNode *node, int indent) {
             fprintf(stderr, "%s '%s'\n", node_type_str(node->type), buf_ptr(&node->data.struct_field.name));
             ast_print(node->data.struct_field.type, indent + 2);
             break;
+        case NodeTypeEnumDecl:
+            fprintf(stderr, "%s '%s'\n",
+                    node_type_str(node->type), buf_ptr(&node->data.enum_decl.name));
+            for (int i = 0; i < node->data.enum_decl.fields.length; i += 1) {
+                AstNode *child = node->data.enum_decl.fields.at(i);
+                ast_print(child, indent + 2);
+            }
+            break;
+        case NodeTypeEnumField:
+            fprintf(stderr, "%s '%s'\n", node_type_str(node->type), buf_ptr(&node->data.enum_field.name));
+            if (node->data.enum_field.val_expr) {
+                ast_print(node->data.enum_field.val_expr, indent + 2);
+            }
+            for (int i = 0; i < node->data.enum_field.fields.length; i += 1) {
+                AstNode *child = node->data.enum_field.fields.at(i);
+                ast_print(child, indent + 2);
+            }
+            break;
         case NodeTypeStructValueExpr:
             fprintf(stderr, "%s\n", node_type_str(node->type));
             ast_print(node->data.struct_val_expr.type, indent + 2);
@@ -2705,7 +2727,106 @@ static AstNode *ast_parse_use(ParseContext *pc, int *token_index) {
 }
 
 /*
-StructDecl : many(Directive) option(FnVisibleMod) token(Struct) token(Symbol) token(LBrace) many(StructMember) token(RBrace)
+EnumDecl : many(Directive) option(FnVisibleMod) token(Enum) token(Symbol) token(LBrace) many(EnumField) token(RBrace)
+EnumField : (EnumDiscriminant | StructPayload) token(Comma)
+EnumDiscriminant : token(Symbol) option(token(Eq) Expression)
+*/
+static AstNode *ast_parse_enum_decl(ParseContext *pc, int *token_index) {
+    Token *first_token = &pc->tokens->at(*token_index);
+
+    VisibMod visib_mod;
+    if (first_token->id == TokenIdKeywordPub) {
+        Token *next_token = &pc->tokens->at(*token_index + 1);
+        if (next_token->id == TokenIdKeywordEnum) {
+            visib_mod = VisibModPub;
+            *token_index += 2;
+        } else {
+            return nullptr;
+        }
+    } else if (first_token->id == TokenIdKeywordExport) {
+        Token *next_token = &pc->tokens->at(*token_index + 1);
+        if (next_token->id == TokenIdKeywordEnum) {
+            visib_mod = VisibModExport;
+            *token_index += 2;
+        } else {
+            return nullptr;
+        }
+    } else if (first_token->id == TokenIdKeywordEnum) {
+        visib_mod = VisibModPrivate;
+        *token_index += 1;
+    } else {
+        return nullptr;
+    }
+
+    Token *enum_name = ast_eat_token(pc, token_index, TokenIdSymbol);
+    AstNode *node = ast_create_node(pc, NodeTypeEnumDecl, first_token);
+    ast_buf_from_token(pc, enum_name, &node->data.enum_decl.name);
+    node->data.enum_decl.visib_mod = visib_mod;
+
+    node->data.enum_decl.directives = pc->directive_list;
+    pc->directive_list = nullptr;
+
+    ast_eat_token(pc, token_index, TokenIdLBrace);
+
+    for (;;) {
+        Token *token = &pc->tokens->at(*token_index);
+
+        if (token->id == TokenIdRBrace) {
+            *token_index += 1;
+            break;
+        } else if (token->id == TokenIdSymbol) {
+            AstNode *field_node = ast_create_node(pc, NodeTypeEnumField, token);
+            *token_index += 1;
+
+            ast_buf_from_token(pc, token, &field_node->data.enum_field.name);
+
+            Token *eq_tok = &pc->tokens->at(*token_index);
+            if (eq_tok->id == TokenIdEq) {
+                *token_index += 1;
+
+                field_node->data.enum_field.val_expr = ast_parse_expression(pc, token_index, true);
+            } else if (eq_tok->id == TokenIdLBrace) {
+                *token_index += 1;
+
+                for (;;) {
+                    Token *token = &pc->tokens->at(*token_index);
+
+                    if (token->id == TokenIdRBrace) {
+                        *token_index += 1;
+                        break;
+                    } else if (token->id == TokenIdSymbol) {
+                        AstNode *sub_field_node = ast_create_node(pc, NodeTypeStructField, token);
+                        *token_index += 1;
+
+                        ast_buf_from_token(pc, token, &sub_field_node->data.struct_field.name);
+
+                        ast_eat_token(pc, token_index, TokenIdColon);
+
+                        sub_field_node->data.struct_field.type = ast_parse_type(pc, token_index);
+
+                        ast_eat_token(pc, token_index, TokenIdComma);
+
+                        field_node->data.enum_decl.fields.append(sub_field_node);
+                    } else {
+                        ast_invalid_token_error(pc, token);
+                    }
+                }
+            }
+
+            ast_eat_token(pc, token_index, TokenIdComma);
+
+            node->data.enum_decl.fields.append(field_node);
+        } else {
+            ast_invalid_token_error(pc, token);
+        }
+    }
+
+    return node;
+}
+
+/*
+StructDecl : many(Directive) option(FnVisibleMod) token(Struct) StructPayload
+StructPayload: token(Symbol) token(LBrace) many(StructMember) token(RBrace)
 StructMember: StructField | FnDecl
 StructField : token(Symbol) token(Colon) Type token(Comma)
 */
@@ -2737,9 +2858,7 @@ static AstNode *ast_parse_struct_decl(ParseContext *pc, int *token_index) {
         return nullptr;
     }
 
-    Token *struct_name = &pc->tokens->at(*token_index);
-    *token_index += 1;
-    ast_expect_token(pc, struct_name, TokenIdSymbol);
+    Token *struct_name = ast_eat_token(pc, token_index, TokenIdSymbol);
 
     AstNode *node = ast_create_node(pc, NodeTypeStructDecl, first_token);
     ast_buf_from_token(pc, struct_name, &node->data.struct_decl.name);
@@ -2798,7 +2917,7 @@ static AstNode *ast_parse_struct_decl(ParseContext *pc, int *token_index) {
 }
 
 /*
-TopLevelDecl : FnDef | ExternBlock | RootExportDecl | Use | StructDecl | VariableDeclaration
+TopLevelDecl : FnDef | ExternBlock | RootExportDecl | Use | StructDecl | VariableDeclaration | EnumDecl
 */
 static void ast_parse_top_level_decls(ParseContext *pc, int *token_index, ZigList<AstNode *> *top_level_decls) {
     for (;;) {
@@ -2837,6 +2956,12 @@ static void ast_parse_top_level_decls(ParseContext *pc, int *token_index, ZigLis
             continue;
         }
 
+        AstNode *enum_node = ast_parse_enum_decl(pc, token_index);
+        if (enum_node) {
+            top_level_decls->append(enum_node);
+            continue;
+        }
+
         if (pc->directive_list->length > 0) {
             ast_error(pc, directive_token, "invalid directive");
         }