mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Jon Ross-Perkins
495d75a394
14.0.6 is the latest release at https://pypi.org/project/clang-format/#history, hopefully 15.0.0 will be out soon. Looks like ssciwr/clang-format-wheel#49 is noting issues for this particular release process though.
1287 lines
37 KiB
Plaintext
1287 lines
37 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// -----------------------------------------------------------------------------
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// Bison Configuration
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// -----------------------------------------------------------------------------
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%require "3.2"
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%language "c++"
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// We don't need a separate header for Bison locations.
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%define api.location.file none
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// Use a type-safe C++ variant for semantic values
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%define api.value.type variant
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// Have Bison generate the functions ‘make_TEXT’ and ‘make_NUMBER’, but also
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// ‘make_YYEOF’, for the end of input.
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%define api.token.constructor
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// Generate the parser as `::Carbon::Parser`.
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%define api.namespace { Carbon }
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%define api.parser.class { Parser }
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// Make parse error messages more detailed
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%define parse.error verbose
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// Enable support for parser debugging
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%define parse.trace true
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// Generate location structs.
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%locations
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// Parameters to the parser and lexer.
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//
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// Parameters to the parser are stored therein as protected data members, and
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// thus available to its methods.
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// "inout" parameters passed to both the parser and the lexer.
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%param {Nonnull<Arena*> arena}
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%param {yyscan_t yyscanner}
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%param {ParseAndLexContext& context}
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// "out" parameter passed to the parser, where the AST is written.
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%parse-param {std::optional<AST>* ast}
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// No shift-reduce conflicts are expected.
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// See README.md#precedence-and-associativity for a description of how
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// operator precedence is expressed.
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%expect 0
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// -----------------------------------------------------------------------------
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%code top {
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#include <algorithm>
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#include <cstdarg>
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#include <cstdio>
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#include <cstdlib>
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#include <vector>
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#include "explorer/syntax/parse_and_lex_context.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/FormatVariadic.h"
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#include "llvm/Support/raw_ostream.h"
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} // %code top
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%code requires {
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#include <optional>
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#include "explorer/ast/ast.h"
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#include "explorer/ast/declaration.h"
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#include "explorer/ast/expression.h"
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#include "explorer/ast/paren_contents.h"
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#include "explorer/ast/pattern.h"
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#include "explorer/ast/value_category.h"
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#include "explorer/common/arena.h"
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#include "explorer/common/nonnull.h"
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#include "explorer/syntax/bison_wrap.h"
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namespace Carbon {
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class ParseAndLexContext;
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} // namespace Carbon
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typedef void* yyscan_t;
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} // %code requires
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%code {
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void Carbon::Parser::error(const location_type&, const std::string& message) {
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context.RecordSyntaxError(message);
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}
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} // %code
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%token <int> integer_literal
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%token <std::string> identifier
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%token <IntrinsicExpression::Intrinsic> intrinsic_identifier
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%token <std::string> sized_type_literal
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%token <std::string> string_literal
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%type <std::string> designator
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%type <ImplKind> impl_kind
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%type <Nonnull<Expression*>> impl_type
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%type <std::pair<LibraryName, bool>> package_directive
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%type <LibraryName> import_directive
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%type <std::vector<LibraryName>> import_directives
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%type <std::string> optional_library_path
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%type <bool> api_or_impl
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%type <ClassExtensibility> class_declaration_extensibility
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%type <std::optional<Nonnull<Expression*>>> class_declaration_extends
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%type <Nonnull<Declaration*>> declaration
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%type <Nonnull<FunctionDeclaration*>> function_declaration
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%type <Nonnull<DestructorDeclaration*>> destructor_declaration;
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%type <Nonnull<MixDeclaration*>> mix_declaration
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%type <Nonnull<AliasDeclaration*>> alias_declaration
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%type <std::vector<Nonnull<Declaration*>>> declaration_list
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%type <std::vector<Nonnull<Declaration*>>> class_body
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%type <std::vector<Nonnull<Declaration*>>> mixin_body
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%type <std::vector<Nonnull<Declaration*>>> interface_body
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%type <std::vector<Nonnull<Declaration*>>> impl_body
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%type <Nonnull<Statement*>> statement
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%type <Nonnull<If*>> if_statement
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%type <std::optional<Nonnull<Block*>>> optional_else
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%type <std::pair<Nonnull<Expression*>, bool>> return_expression
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%type <Nonnull<Block*>> block
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%type <std::vector<Nonnull<Statement*>>> statement_list
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%type <Nonnull<Expression*>> primary_expression
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%type <Nonnull<Expression*>> postfix_expression
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%type <Nonnull<Expression*>> ref_deref_expression
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%type <Nonnull<Expression*>> type_expression
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%type <Nonnull<Expression*>> fn_type_expression
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%type <Nonnull<Expression*>> minus_expression
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%type <Nonnull<Expression*>> complement_expression
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%type <Nonnull<Expression*>> unary_expression
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%type <Nonnull<Expression*>> simple_binary_operand
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%type <Nonnull<Expression*>> multiplicative_lhs
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%type <Nonnull<Expression*>> multiplicative_expression
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%type <Nonnull<Expression*>> additive_operand
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%type <Nonnull<Expression*>> additive_lhs
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%type <Nonnull<Expression*>> additive_expression
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%type <Nonnull<Expression*>> modulo_expression
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%type <Nonnull<Expression*>> bitwise_and_lhs
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%type <Nonnull<Expression*>> bitwise_and_expression
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%type <Nonnull<Expression*>> bitwise_or_lhs
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%type <Nonnull<Expression*>> bitwise_or_expression
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%type <Nonnull<Expression*>> bitwise_xor_lhs
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%type <Nonnull<Expression*>> bitwise_xor_expression
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%type <Nonnull<Expression*>> bitwise_expression
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%type <Nonnull<Expression*>> bit_shift_expression
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%type <Nonnull<Expression*>> as_expression
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%type <Nonnull<Expression*>> unimpl_expression
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%type <Nonnull<Expression*>> value_expression
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%type <Nonnull<Expression*>> comparison_operand
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%type <Nonnull<Expression*>> comparison_expression
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%type <Nonnull<Expression*>> not_expression
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%type <Nonnull<Expression*>> predicate_expression
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%type <Nonnull<Expression*>> and_or_operand
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%type <Nonnull<Expression*>> and_lhs
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%type <Nonnull<Expression*>> and_expression
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%type <Nonnull<Expression*>> or_lhs
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%type <Nonnull<Expression*>> or_expression
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%type <Nonnull<WhereClause*>> where_clause
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%type <std::vector<Nonnull<WhereClause*>>> where_clause_list
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%type <Nonnull<Expression*>> where_expression
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%type <Nonnull<Expression*>> type_or_where_expression
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%type <Nonnull<Expression*>> statement_expression
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%type <Nonnull<Expression*>> if_expression
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%type <Nonnull<Expression*>> expression
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%type <Nonnull<Expression*>> mixin_import
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%type <Nonnull<GenericBinding*>> generic_binding
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%type <Nonnull<Pattern*>> deduced_param
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%type <std::vector<Nonnull<AstNode*>>> deduced_params
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%type <std::vector<Nonnull<AstNode*>>> impl_deduced_params
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%type <std::vector<Nonnull<AstNode*>>> deduced_param_list
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%type <Nonnull<Pattern*>> pattern
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%type <Nonnull<Pattern*>> non_expression_pattern
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%type <BisonWrap<ReturnTerm>> return_term
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%type <Nonnull<Expression*>> paren_expression
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%type <Nonnull<StructLiteral*>> struct_literal
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%type <std::vector<FieldInitializer>> struct_literal_contents
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%type <Nonnull<StructTypeLiteral*>> struct_type_literal
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%type <std::vector<FieldInitializer>> struct_type_literal_contents
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%type <Nonnull<TupleLiteral*>> tuple
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%type <std::string> binding_lhs
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%type <Nonnull<BindingPattern*>> variable_declaration
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%type <ParenContents<Expression>> paren_expression_base
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%type <ParenContents<Expression>> paren_expression_contents
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%type <Nonnull<Pattern*>> paren_pattern
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%type <Nonnull<TuplePattern*>> tuple_pattern
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%type <Nonnull<TuplePattern*>> maybe_empty_tuple_pattern
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%type <std::optional<Nonnull<TuplePattern*>>> type_params
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%type <ParenContents<Pattern>> paren_pattern_base
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%type <ParenContents<Pattern>> paren_pattern_contents
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%type <Nonnull<AlternativeSignature*>> alternative
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%type <std::vector<Nonnull<AlternativeSignature*>>> alternative_list
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%type <std::vector<Nonnull<AlternativeSignature*>>> alternative_list_contents
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%type <BisonWrap<Match::Clause>> clause
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%type <std::vector<Match::Clause>> clause_list
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%type <Operator> comparison_operator;
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%token
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// Most tokens have their spelling defined in lexer.lpp.
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// table-begin
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ABSTRACT
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ADDR
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ALIAS
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AMPERSAND
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AND
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API
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ARROW
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AS
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AUTO
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AWAIT
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BASE
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BOOL
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BREAK
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CARET
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CASE
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CHOICE
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CLASS
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COLON
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COLON_BANG
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COMMA
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CONTINUATION
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CONTINUATION_TYPE
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CONTINUE
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DEFAULT
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DESTRUCTOR
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DOUBLE_ARROW
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ELSE
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EQUAL
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EQUAL_EQUAL
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EXTENDS
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EXTERNAL
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FALSE
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FN
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FN_TYPE
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FOR
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FORALL
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GREATER
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GREATER_EQUAL
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GREATER_GREATER
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IF
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IMPL
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IMPORT
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IN
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INTERFACE
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IS
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LEFT_CURLY_BRACE
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LEFT_PARENTHESIS
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LEFT_SQUARE_BRACKET
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LESS
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LESS_EQUAL
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LESS_LESS
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LET
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LIBRARY
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MATCH
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MINUS
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MIX
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MIXIN
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NOT
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NOT_EQUAL
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OR
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PACKAGE
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PERCENT
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PERIOD
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PIPE
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PLUS
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RETURN
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RETURNED
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RIGHT_CURLY_BRACE
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RIGHT_PARENTHESIS
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RIGHT_SQUARE_BRACKET
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RUN
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SELF
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SEMICOLON
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SLASH
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STRING
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THEN
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TRUE
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TYPE
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UNDERSCORE
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UNIMPL_EXAMPLE
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VAR
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WHERE
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WHILE
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// table-end
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// Used to track EOF.
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END_OF_FILE 0
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// Only used for precedence.
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FNARROW "-> in return type"
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// The lexer determines the arity and fixity of each `*` based on whitespace
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// and adjacent tokens. UNARY_STAR indicates that the operator is unary but
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// could be either prefix or postfix.
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UNARY_STAR "unary *"
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PREFIX_STAR "prefix *"
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POSTFIX_STAR "postfix *"
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BINARY_STAR "binary *"
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;
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%start input
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%%
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input: package_directive import_directives declaration_list
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{
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*ast = AST({.package = $1.first,
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.is_api = $1.second,
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.imports = std::move($2),
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.declarations = std::move($3)});
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}
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;
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package_directive:
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PACKAGE identifier optional_library_path api_or_impl SEMICOLON
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{ $$ = {LibraryName({.package = $2, .path = $3}), $4}; }
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;
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import_directive:
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IMPORT identifier optional_library_path SEMICOLON
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{ $$ = LibraryName({.package = $2, .path = $3}); }
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;
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import_directives:
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// Empty
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{ $$ = std::vector<LibraryName>(); }
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| import_directives import_directive
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{
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$$ = std::move($1);
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$$.push_back($2);
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}
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;
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optional_library_path:
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// Empty
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{ $$ = ""; }
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| LIBRARY string_literal
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{ $$ = $2; }
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;
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api_or_impl:
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API
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{ $$ = true; }
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| IMPL
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{ $$ = false; }
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;
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primary_expression:
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identifier
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{ $$ = arena->New<IdentifierExpression>(context.source_loc(), $1); }
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| designator
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{
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// `.Foo` is rewritten to `.Self.Foo`.
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$$ = arena->New<SimpleMemberAccessExpression>(
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context.source_loc(),
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arena->New<DotSelfExpression>(context.source_loc()), $1);
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}
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| PERIOD SELF
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{ $$ = arena->New<DotSelfExpression>(context.source_loc()); }
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| integer_literal
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{ $$ = arena->New<IntLiteral>(context.source_loc(), $1); }
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| string_literal
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{ $$ = arena->New<StringLiteral>(context.source_loc(), $1); }
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| TRUE
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{ $$ = arena->New<BoolLiteral>(context.source_loc(), true); }
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| FALSE
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{ $$ = arena->New<BoolLiteral>(context.source_loc(), false); }
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| sized_type_literal
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{
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int val = 0;
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if (!llvm::to_integer(llvm::StringRef($1).substr(1), val)) {
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context.RecordSyntaxError(
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llvm::formatv("Invalid type literal: {0}", $1));
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YYERROR;
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} else if ($1[0] != 'i' || val != 32) {
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context.RecordSyntaxError(
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llvm::formatv("Only i32 is supported for now: {0}", $1));
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YYERROR;
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} else {
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$$ = arena->New<IntTypeLiteral>(context.source_loc());
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}
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}
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| SELF
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// TODO: Should we create a new TypeLiteral for `Self`?
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{ $$ = arena->New<IdentifierExpression>(context.source_loc(), "Self"); }
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| STRING
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{ $$ = arena->New<StringTypeLiteral>(context.source_loc()); }
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| BOOL
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{ $$ = arena->New<BoolTypeLiteral>(context.source_loc()); }
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| TYPE
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{ $$ = arena->New<TypeTypeLiteral>(context.source_loc()); }
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| CONTINUATION_TYPE
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{ $$ = arena->New<ContinuationTypeLiteral>(context.source_loc()); }
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| paren_expression { $$ = $1; }
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| struct_literal { $$ = $1; }
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| struct_type_literal { $$ = $1; }
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| LEFT_SQUARE_BRACKET expression SEMICOLON expression RIGHT_SQUARE_BRACKET
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{ $$ = arena->New<ArrayTypeLiteral>(context.source_loc(), $2, $4); }
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;
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postfix_expression:
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primary_expression
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| postfix_expression designator
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{
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$$ = arena->New<SimpleMemberAccessExpression>(context.source_loc(), $1,
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$2);
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}
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| postfix_expression PERIOD LEFT_PARENTHESIS expression RIGHT_PARENTHESIS
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{
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$$ = arena->New<CompoundMemberAccessExpression>(context.source_loc(), $1,
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$4);
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}
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| postfix_expression LEFT_SQUARE_BRACKET expression RIGHT_SQUARE_BRACKET
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{ $$ = arena->New<IndexExpression>(context.source_loc(), $1, $3); }
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| intrinsic_identifier tuple
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{ $$ = arena->New<IntrinsicExpression>($1, $2, context.source_loc()); }
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| postfix_expression tuple
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{ $$ = arena->New<CallExpression>(context.source_loc(), $1, $2); }
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| postfix_expression POSTFIX_STAR
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{
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$$ = arena->New<OperatorExpression>(
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context.source_loc(), Operator::Ptr,
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std::vector<Nonnull<Expression*>>({$1}));
|
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}
|
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| postfix_expression UNARY_STAR
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{
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$$ = arena->New<OperatorExpression>(
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context.source_loc(), Operator::Ptr,
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std::vector<Nonnull<Expression*>>({$1}));
|
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}
|
||
;
|
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ref_deref_expression:
|
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postfix_expression
|
||
| PREFIX_STAR ref_deref_expression
|
||
{
|
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$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Deref,
|
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std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
| UNARY_STAR ref_deref_expression
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{
|
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$$ = arena->New<OperatorExpression>(
|
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context.source_loc(), Operator::Deref,
|
||
std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
| AMPERSAND ref_deref_expression
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
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context.source_loc(), Operator::AddressOf,
|
||
std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
;
|
||
fn_type_expression:
|
||
FN_TYPE tuple ARROW type_expression
|
||
{ $$ = arena->New<FunctionTypeLiteral>(context.source_loc(), $2, $4); }
|
||
;
|
||
type_expression:
|
||
ref_deref_expression
|
||
| bitwise_and_expression
|
||
| fn_type_expression
|
||
;
|
||
minus_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
MINUS ref_deref_expression
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Neg,
|
||
std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
;
|
||
complement_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
CARET ref_deref_expression
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Complement,
|
||
std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
;
|
||
unary_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
minus_expression
|
||
| complement_expression
|
||
;
|
||
// A simple_binary_operand is an operand of a binary operator
|
||
// that is not itself a binary operator expression.
|
||
simple_binary_operand:
|
||
ref_deref_expression
|
||
| unary_expression
|
||
;
|
||
multiplicative_lhs:
|
||
simple_binary_operand
|
||
| multiplicative_expression
|
||
;
|
||
multiplicative_expression:
|
||
multiplicative_lhs BINARY_STAR simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Mul,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
| multiplicative_lhs SLASH simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Div,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
additive_operand:
|
||
simple_binary_operand
|
||
| multiplicative_expression
|
||
;
|
||
additive_lhs:
|
||
simple_binary_operand
|
||
| additive_expression
|
||
;
|
||
additive_expression:
|
||
multiplicative_expression
|
||
| additive_lhs PLUS additive_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Add,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
| additive_lhs MINUS additive_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Sub,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
modulo_expression:
|
||
simple_binary_operand PERCENT simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Mod,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
bitwise_and_lhs:
|
||
simple_binary_operand
|
||
| bitwise_and_expression
|
||
;
|
||
bitwise_and_expression:
|
||
bitwise_and_lhs AMPERSAND simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::BitwiseAnd,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
bitwise_or_lhs:
|
||
simple_binary_operand
|
||
| bitwise_or_expression
|
||
;
|
||
bitwise_or_expression:
|
||
bitwise_or_lhs PIPE simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::BitwiseOr,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
bitwise_xor_lhs:
|
||
simple_binary_operand
|
||
| bitwise_xor_expression
|
||
;
|
||
bitwise_xor_expression:
|
||
bitwise_xor_lhs CARET simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::BitwiseXor,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
bitwise_expression:
|
||
bitwise_and_expression
|
||
| bitwise_or_expression
|
||
| bitwise_xor_expression
|
||
;
|
||
bit_shift_expression:
|
||
simple_binary_operand LESS_LESS simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::BitShiftLeft,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
| simple_binary_operand GREATER_GREATER simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::BitShiftRight,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
as_expression:
|
||
simple_binary_operand AS simple_binary_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::As,
|
||
std::vector<Nonnull<Expression*>>{$1, $3});
|
||
}
|
||
;
|
||
unimpl_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
ref_deref_expression UNIMPL_EXAMPLE ref_deref_expression
|
||
{
|
||
$$ = arena->New<UnimplementedExpression>(context.source_loc(),
|
||
"ExampleInfix", $1, $3);
|
||
}
|
||
;
|
||
value_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
additive_expression
|
||
| as_expression
|
||
| bitwise_expression
|
||
| bit_shift_expression
|
||
| fn_type_expression
|
||
| modulo_expression
|
||
| unary_expression
|
||
| unimpl_expression
|
||
;
|
||
comparison_operand:
|
||
ref_deref_expression
|
||
| value_expression
|
||
;
|
||
comparison_operator:
|
||
EQUAL_EQUAL
|
||
{ $$ = Operator::Eq; }
|
||
| LESS
|
||
{ $$ = Operator::Less; }
|
||
| LESS_EQUAL
|
||
{ $$ = Operator::LessEq; }
|
||
| GREATER
|
||
{ $$ = Operator::Greater; }
|
||
| GREATER_EQUAL
|
||
{ $$ = Operator::GreaterEq; }
|
||
| NOT_EQUAL
|
||
{ $$ = Operator::NotEq; }
|
||
;
|
||
comparison_expression:
|
||
value_expression
|
||
| comparison_operand comparison_operator comparison_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), $2,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
not_expression:
|
||
NOT ref_deref_expression
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Not,
|
||
std::vector<Nonnull<Expression*>>({$2}));
|
||
}
|
||
;
|
||
predicate_expression:
|
||
// ref_deref_expression excluded due to precedence diamond.
|
||
not_expression
|
||
| comparison_expression
|
||
;
|
||
and_or_operand:
|
||
ref_deref_expression
|
||
| predicate_expression
|
||
;
|
||
and_lhs:
|
||
and_or_operand
|
||
| and_expression
|
||
;
|
||
and_expression:
|
||
// predicate_expression excluded due to precedence diamond.
|
||
and_lhs AND and_or_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::And,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
or_lhs:
|
||
and_or_operand
|
||
| or_expression
|
||
;
|
||
or_expression:
|
||
// predicate_expression excluded due to precedence diamond.
|
||
or_lhs OR and_or_operand
|
||
{
|
||
$$ = arena->New<OperatorExpression>(
|
||
context.source_loc(), Operator::Or,
|
||
std::vector<Nonnull<Expression*>>({$1, $3}));
|
||
}
|
||
;
|
||
where_clause:
|
||
comparison_operand IS comparison_operand
|
||
{ $$ = arena->New<IsWhereClause>(context.source_loc(), $1, $3); }
|
||
| comparison_operand EQUAL_EQUAL comparison_operand
|
||
{ $$ = arena->New<EqualsWhereClause>(context.source_loc(), $1, $3); }
|
||
;
|
||
where_clause_list:
|
||
where_clause
|
||
{ $$ = {$1}; }
|
||
| where_clause_list AND where_clause
|
||
{
|
||
$$ = std::move($1);
|
||
$$.push_back($3);
|
||
}
|
||
;
|
||
where_expression:
|
||
type_expression WHERE where_clause_list
|
||
{
|
||
auto* self =
|
||
arena->New<GenericBinding>(context.source_loc(), ".Self", $1);
|
||
$$ = arena->New<WhereExpression>(context.source_loc(), self, $3);
|
||
}
|
||
;
|
||
type_or_where_expression:
|
||
type_expression
|
||
| where_expression
|
||
;
|
||
statement_expression:
|
||
ref_deref_expression
|
||
| predicate_expression
|
||
| and_expression
|
||
| or_expression
|
||
| where_expression
|
||
;
|
||
if_expression:
|
||
statement_expression
|
||
| IF expression THEN if_expression ELSE if_expression
|
||
{ $$ = arena->New<IfExpression>(context.source_loc(), $2, $4, $6); }
|
||
;
|
||
expression:
|
||
if_expression
|
||
;
|
||
designator: PERIOD identifier { $$ = $2; }
|
||
;
|
||
paren_expression: paren_expression_base
|
||
{ $$ = ExpressionFromParenContents(arena, context.source_loc(), $1); }
|
||
;
|
||
tuple: paren_expression_base
|
||
{ $$ = TupleExpressionFromParenContents(arena, context.source_loc(), $1); }
|
||
;
|
||
paren_expression_base:
|
||
LEFT_PARENTHESIS RIGHT_PARENTHESIS
|
||
{ $$ = {.elements = {}, .has_trailing_comma = false}; }
|
||
| LEFT_PARENTHESIS paren_expression_contents RIGHT_PARENTHESIS
|
||
{ $$ = $2; }
|
||
| LEFT_PARENTHESIS paren_expression_contents COMMA RIGHT_PARENTHESIS
|
||
{
|
||
$$ = $2;
|
||
$$.has_trailing_comma = true;
|
||
}
|
||
;
|
||
paren_expression_contents:
|
||
expression
|
||
{ $$ = {.elements = {$1}, .has_trailing_comma = false}; }
|
||
| paren_expression_contents COMMA expression
|
||
{
|
||
$$ = $1;
|
||
$$.elements.push_back($3);
|
||
}
|
||
;
|
||
|
||
struct_literal:
|
||
LEFT_CURLY_BRACE struct_literal_contents RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<StructLiteral>(context.source_loc(), $2); }
|
||
| LEFT_CURLY_BRACE struct_literal_contents COMMA RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<StructLiteral>(context.source_loc(), $2); }
|
||
;
|
||
struct_literal_contents:
|
||
designator EQUAL expression
|
||
{ $$ = {FieldInitializer($1, $3)}; }
|
||
| struct_literal_contents COMMA designator EQUAL expression
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(FieldInitializer($3, $5));
|
||
}
|
||
;
|
||
|
||
struct_type_literal:
|
||
LEFT_CURLY_BRACE RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<StructTypeLiteral>(context.source_loc()); }
|
||
| LEFT_CURLY_BRACE struct_type_literal_contents RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<StructTypeLiteral>(context.source_loc(), $2); }
|
||
| LEFT_CURLY_BRACE struct_type_literal_contents COMMA RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<StructTypeLiteral>(context.source_loc(), $2); }
|
||
;
|
||
struct_type_literal_contents:
|
||
designator COLON expression
|
||
{ $$ = {FieldInitializer($1, $3)}; }
|
||
| struct_type_literal_contents COMMA designator COLON expression
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(FieldInitializer($3, $5));
|
||
}
|
||
;
|
||
|
||
// In many cases, using `pattern` recursively will result in ambiguities.
|
||
// When that happens, it's necessary to factor out two separate productions,
|
||
// one for when the sub-pattern is an expression, and one for when it is not.
|
||
// To facilitate this, non-terminals besides `pattern` whose names contain
|
||
// `pattern` are structured to be disjoint from `expression`, unless otherwise
|
||
// specified.
|
||
pattern:
|
||
non_expression_pattern
|
||
{ $$ = $1; }
|
||
| expression
|
||
{ $$ = arena->New<ExpressionPattern>($1); }
|
||
;
|
||
non_expression_pattern:
|
||
AUTO
|
||
{ $$ = arena->New<AutoPattern>(context.source_loc()); }
|
||
| binding_lhs COLON pattern
|
||
{
|
||
$$ = arena->New<BindingPattern>(context.source_loc(), $1, $3,
|
||
std::nullopt);
|
||
}
|
||
| binding_lhs COLON_BANG expression
|
||
{ $$ = arena->New<GenericBinding>(context.source_loc(), $1, $3); }
|
||
| paren_pattern
|
||
{ $$ = $1; }
|
||
| postfix_expression tuple_pattern
|
||
{
|
||
ErrorOr<Nonnull<AlternativePattern*>> alternative_pattern =
|
||
AlternativePattern::Create(arena, context.source_loc(), $1, $2);
|
||
if (alternative_pattern.ok()) {
|
||
$$ = *alternative_pattern;
|
||
} else {
|
||
context.RecordSyntaxError(std::move(alternative_pattern).error());
|
||
YYERROR;
|
||
}
|
||
}
|
||
| VAR non_expression_pattern
|
||
{ $$ = arena->New<VarPattern>(context.source_loc(), $2); }
|
||
;
|
||
binding_lhs:
|
||
identifier { $$ = $1; }
|
||
| UNDERSCORE { $$ = AnonymousName; }
|
||
;
|
||
paren_pattern: paren_pattern_base
|
||
{ $$ = PatternFromParenContents(arena, context.source_loc(), $1); }
|
||
;
|
||
paren_pattern_base:
|
||
LEFT_PARENTHESIS paren_pattern_contents RIGHT_PARENTHESIS
|
||
{ $$ = $2; }
|
||
| LEFT_PARENTHESIS paren_pattern_contents COMMA RIGHT_PARENTHESIS
|
||
{
|
||
$$ = $2;
|
||
$$.has_trailing_comma = true;
|
||
}
|
||
;
|
||
// paren_pattern is analogous to paren_expression, but in order to avoid
|
||
// ambiguities, it must be disjoint from paren_expression, meaning it must
|
||
// contain at least one non_expression_pattern. The structure of this rule
|
||
// is very different from the corresponding expression rule because is has to
|
||
// enforce that requirement.
|
||
paren_pattern_contents:
|
||
non_expression_pattern
|
||
{ $$ = {.elements = {$1}, .has_trailing_comma = false}; }
|
||
| paren_expression_contents COMMA non_expression_pattern
|
||
{
|
||
$$ = ParenExpressionToParenPattern(arena, $1);
|
||
$$.elements.push_back($3);
|
||
}
|
||
| paren_pattern_contents COMMA expression
|
||
{
|
||
$$ = $1;
|
||
$$.elements.push_back(arena->New<ExpressionPattern>($3));
|
||
}
|
||
| paren_pattern_contents COMMA non_expression_pattern
|
||
{
|
||
$$ = $1;
|
||
$$.elements.push_back($3);
|
||
}
|
||
;
|
||
tuple_pattern: paren_pattern_base
|
||
{ $$ = TuplePatternFromParenContents(arena, context.source_loc(), $1); }
|
||
;
|
||
// Unlike most `pattern` nonterminals, this one overlaps with `expression`,
|
||
// so it should be used only when prior context (such as an introducer)
|
||
// rules out the possibility of an `expression` at this point.
|
||
maybe_empty_tuple_pattern:
|
||
LEFT_PARENTHESIS RIGHT_PARENTHESIS
|
||
{
|
||
$$ = arena->New<TuplePattern>(context.source_loc(),
|
||
std::vector<Nonnull<Pattern*>>());
|
||
}
|
||
| tuple_pattern
|
||
{ $$ = $1; }
|
||
;
|
||
|
||
clause:
|
||
CASE pattern DOUBLE_ARROW block
|
||
{ $$ = Match::Clause($2, $4); }
|
||
| DEFAULT DOUBLE_ARROW block
|
||
{
|
||
$$ = Match::Clause(arena->New<BindingPattern>(
|
||
context.source_loc(), std::string(AnonymousName),
|
||
arena->New<AutoPattern>(context.source_loc()),
|
||
ValueCategory::Let),
|
||
$3);
|
||
}
|
||
;
|
||
clause_list:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| clause_list clause
|
||
{
|
||
$$ = $1;
|
||
$$.push_back($2);
|
||
}
|
||
;
|
||
statement:
|
||
statement_expression EQUAL expression SEMICOLON
|
||
{ $$ = arena->New<Assign>(context.source_loc(), $1, $3); }
|
||
| VAR pattern SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDefinition>(
|
||
context.source_loc(), $2, std::nullopt, ValueCategory::Var,
|
||
VariableDefinition::DefinitionType::Var);
|
||
}
|
||
| VAR pattern EQUAL expression SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDefinition>(
|
||
context.source_loc(), $2, $4, ValueCategory::Var,
|
||
VariableDefinition::DefinitionType::Var);
|
||
}
|
||
| RETURNED VAR variable_declaration SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDefinition>(
|
||
context.source_loc(), $3, std::nullopt, ValueCategory::Var,
|
||
VariableDefinition::DefinitionType::Returned);
|
||
}
|
||
| RETURNED VAR variable_declaration EQUAL expression SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDefinition>(
|
||
context.source_loc(), $3, $5, ValueCategory::Var,
|
||
VariableDefinition::DefinitionType::Returned);
|
||
}
|
||
| LET pattern EQUAL expression SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDefinition>(
|
||
context.source_loc(), $2, $4, ValueCategory::Let,
|
||
VariableDefinition::DefinitionType::Var);
|
||
}
|
||
| statement_expression SEMICOLON
|
||
{ $$ = arena->New<ExpressionStatement>(context.source_loc(), $1); }
|
||
| if_statement
|
||
{ $$ = $1; }
|
||
| WHILE LEFT_PARENTHESIS expression RIGHT_PARENTHESIS block
|
||
{ $$ = arena->New<While>(context.source_loc(), $3, $5); }
|
||
| BREAK SEMICOLON
|
||
{ $$ = arena->New<Break>(context.source_loc()); }
|
||
| CONTINUE SEMICOLON
|
||
{ $$ = arena->New<Continue>(context.source_loc()); }
|
||
| RETURN return_expression SEMICOLON
|
||
{
|
||
auto [return_exp, is_omitted_exp] = $2;
|
||
$$ = arena->New<ReturnExpression>(context.source_loc(), return_exp,
|
||
is_omitted_exp);
|
||
}
|
||
| RETURN VAR SEMICOLON
|
||
{ $$ = arena->New<ReturnVar>(context.source_loc()); }
|
||
| MATCH LEFT_PARENTHESIS expression RIGHT_PARENTHESIS LEFT_CURLY_BRACE
|
||
clause_list RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<Match>(context.source_loc(), $3, $6); }
|
||
| CONTINUATION identifier block
|
||
{ $$ = arena->New<Continuation>(context.source_loc(), $2, $3); }
|
||
| RUN expression SEMICOLON
|
||
{ $$ = arena->New<Run>(context.source_loc(), $2); }
|
||
| AWAIT SEMICOLON
|
||
{ $$ = arena->New<Await>(context.source_loc()); }
|
||
| FOR LEFT_PARENTHESIS variable_declaration IN type_expression RIGHT_PARENTHESIS block
|
||
{ $$ = arena->New<For>(context.source_loc(), $3, $5, $7); }
|
||
;
|
||
if_statement:
|
||
IF LEFT_PARENTHESIS expression RIGHT_PARENTHESIS block optional_else
|
||
{ $$ = arena->New<If>(context.source_loc(), $3, $5, $6); }
|
||
;
|
||
optional_else:
|
||
// Empty
|
||
{ $$ = std::nullopt; }
|
||
| ELSE if_statement
|
||
{
|
||
$$ = arena->New<Block>(context.source_loc(),
|
||
std::vector<Nonnull<Statement*>>({$2}));
|
||
}
|
||
| ELSE block
|
||
{ $$ = $2; }
|
||
;
|
||
return_expression:
|
||
// Empty
|
||
{ $$ = {arena->New<TupleLiteral>(context.source_loc()), true}; }
|
||
| expression
|
||
{ $$ = {$1, false}; }
|
||
;
|
||
statement_list:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| statement_list statement
|
||
{
|
||
$$ = std::move($1);
|
||
$$.push_back($2);
|
||
}
|
||
;
|
||
block:
|
||
LEFT_CURLY_BRACE statement_list RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<Block>(context.source_loc(), std::move($2)); }
|
||
;
|
||
return_term:
|
||
// Empty
|
||
{ $$ = ReturnTerm::Omitted(context.source_loc()); }
|
||
| ARROW AUTO
|
||
{ $$ = ReturnTerm::Auto(context.source_loc()); }
|
||
| ARROW expression
|
||
{ $$ = ReturnTerm::Explicit($2); }
|
||
;
|
||
generic_binding:
|
||
identifier COLON_BANG expression
|
||
{
|
||
$$ = arena->New<GenericBinding>(context.source_loc(), std::move($1), $3);
|
||
}
|
||
;
|
||
deduced_param:
|
||
generic_binding
|
||
{ $$ = $1; }
|
||
| variable_declaration
|
||
{ $$ = $1; }
|
||
| ADDR variable_declaration
|
||
{ $$ = arena->New<AddrPattern>(context.source_loc(), $2); }
|
||
;
|
||
deduced_param_list:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| deduced_param
|
||
{ $$ = {$1}; }
|
||
| deduced_param_list COMMA deduced_param
|
||
{
|
||
$$ = $1; // TODO: can we std::move here?
|
||
$$.push_back($3);
|
||
}
|
||
;
|
||
deduced_params:
|
||
// Empty
|
||
{ $$ = std::vector<Nonnull<AstNode*>>(); }
|
||
| LEFT_SQUARE_BRACKET deduced_param_list RIGHT_SQUARE_BRACKET
|
||
{ $$ = $2; }
|
||
;
|
||
impl_deduced_params:
|
||
// Empty
|
||
{ $$ = std::vector<Nonnull<AstNode*>>(); }
|
||
| FORALL LEFT_SQUARE_BRACKET deduced_param_list RIGHT_SQUARE_BRACKET
|
||
{ $$ = $3; }
|
||
;
|
||
function_declaration:
|
||
FN identifier deduced_params maybe_empty_tuple_pattern return_term block
|
||
{
|
||
ErrorOr<FunctionDeclaration*> fn = FunctionDeclaration::Create(
|
||
arena, context.source_loc(), $2, $3, $4, $5, $6);
|
||
if (fn.ok()) {
|
||
$$ = *fn;
|
||
} else {
|
||
context.RecordSyntaxError(std::move(fn).error());
|
||
YYERROR;
|
||
}
|
||
}
|
||
| FN identifier deduced_params maybe_empty_tuple_pattern return_term SEMICOLON
|
||
{
|
||
ErrorOr<FunctionDeclaration*> fn = FunctionDeclaration::Create(
|
||
arena, context.source_loc(), $2, $3, $4, $5, std::nullopt);
|
||
if (fn.ok()) {
|
||
$$ = *fn;
|
||
} else {
|
||
context.RecordSyntaxError(std::move(fn).error());
|
||
YYERROR;
|
||
}
|
||
}
|
||
;
|
||
variable_declaration: identifier COLON pattern
|
||
{
|
||
$$ = arena->New<BindingPattern>(context.source_loc(), $1, $3,
|
||
std::nullopt);
|
||
}
|
||
;
|
||
alias_declaration: ALIAS identifier EQUAL expression SEMICOLON
|
||
{ $$ = arena->New<AliasDeclaration>(context.source_loc(), $2, $4); }
|
||
;
|
||
// EXPERIMENTAL MIXIN FEATURE
|
||
mix_declaration: MIX expression SEMICOLON
|
||
{ $$ = arena->New<MixDeclaration>(context.source_loc(), $2); }
|
||
;
|
||
alternative:
|
||
identifier tuple
|
||
{ $$ = arena->New<AlternativeSignature>(context.source_loc(), $1, $2); }
|
||
| identifier
|
||
{
|
||
$$ = arena->New<AlternativeSignature>(
|
||
context.source_loc(), $1,
|
||
arena->New<TupleLiteral>(context.source_loc()));
|
||
}
|
||
;
|
||
alternative_list:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| alternative_list_contents
|
||
{ $$ = $1; }
|
||
| alternative_list_contents COMMA
|
||
{ $$ = $1; }
|
||
;
|
||
alternative_list_contents:
|
||
alternative
|
||
{ $$ = {std::move($1)}; }
|
||
| alternative_list_contents COMMA alternative
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(std::move($3));
|
||
}
|
||
;
|
||
type_params:
|
||
// Empty
|
||
{ $$ = std::nullopt; }
|
||
| tuple_pattern
|
||
{ $$ = $1; }
|
||
;
|
||
// EXPERIMENTAL MIXIN FEATURE
|
||
mixin_import:
|
||
// Empty
|
||
{ $$ = arena->New<TypeTypeLiteral>(context.source_loc()); }
|
||
| FOR expression
|
||
{
|
||
context.RecordSyntaxError("'for' not supported currently");
|
||
YYERROR;
|
||
// $$ = $2;
|
||
}
|
||
;
|
||
class_declaration_extensibility:
|
||
// Empty
|
||
{ $$ = Carbon::ClassExtensibility::None; }
|
||
| ABSTRACT
|
||
{ $$ = Carbon::ClassExtensibility::Abstract; }
|
||
| BASE
|
||
{ $$ = Carbon::ClassExtensibility::Base; }
|
||
;
|
||
class_declaration_extends:
|
||
// Empty
|
||
{ $$ = std::nullopt; }
|
||
| EXTENDS expression
|
||
{ $$ = $2; }
|
||
;
|
||
declaration:
|
||
function_declaration
|
||
{ $$ = $1; }
|
||
| destructor_declaration
|
||
{ $$ = $1; }
|
||
| class_declaration_extensibility CLASS identifier type_params class_declaration_extends LEFT_CURLY_BRACE class_body RIGHT_CURLY_BRACE
|
||
{
|
||
$$ = arena->New<ClassDeclaration>(
|
||
context.source_loc(), $3,
|
||
arena->New<SelfDeclaration>(context.source_loc()), $1, $4, $5, $7);
|
||
}
|
||
| MIXIN identifier type_params mixin_import LEFT_CURLY_BRACE mixin_body RIGHT_CURLY_BRACE
|
||
{
|
||
// EXPERIMENTAL MIXN FEATURE
|
||
auto self = arena->New<GenericBinding>(context.source_loc(), "Self", $4);
|
||
$$ = arena->New<MixinDeclaration>(context.source_loc(), $2, $3, self, $6);
|
||
}
|
||
| CHOICE identifier type_params LEFT_CURLY_BRACE alternative_list RIGHT_CURLY_BRACE
|
||
{ $$ = arena->New<ChoiceDeclaration>(context.source_loc(), $2, $3, $5); }
|
||
| VAR variable_declaration SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDeclaration>(context.source_loc(), $2,
|
||
std::nullopt, ValueCategory::Var);
|
||
}
|
||
| VAR variable_declaration EQUAL expression SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDeclaration>(context.source_loc(), $2, $4,
|
||
ValueCategory::Var);
|
||
}
|
||
| LET variable_declaration EQUAL expression SEMICOLON
|
||
{
|
||
$$ = arena->New<VariableDeclaration>(context.source_loc(), $2, $4,
|
||
ValueCategory::Let);
|
||
}
|
||
| INTERFACE identifier type_params LEFT_CURLY_BRACE interface_body RIGHT_CURLY_BRACE
|
||
{
|
||
$$ = arena->New<InterfaceDeclaration>(arena, context.source_loc(), $2, $3,
|
||
$5);
|
||
}
|
||
| impl_kind IMPL impl_deduced_params impl_type AS type_or_where_expression LEFT_CURLY_BRACE impl_body RIGHT_CURLY_BRACE
|
||
{
|
||
ErrorOr<ImplDeclaration*> impl = ImplDeclaration::Create(
|
||
arena, context.source_loc(), $1, $4, $6, $3, $8);
|
||
if (impl.ok()) {
|
||
$$ = *impl;
|
||
} else {
|
||
context.RecordSyntaxError(std::move(impl).error());
|
||
YYERROR;
|
||
}
|
||
}
|
||
| alias_declaration
|
||
{ $$ = $1; }
|
||
;
|
||
impl_kind:
|
||
// Internal
|
||
{ $$ = Carbon::ImplKind::InternalImpl; }
|
||
| EXTERNAL
|
||
{ $$ = Carbon::ImplKind::ExternalImpl; }
|
||
;
|
||
impl_type:
|
||
// Self
|
||
{ $$ = arena->New<IdentifierExpression>(context.source_loc(), "Self"); }
|
||
| type_expression
|
||
;
|
||
destructor_declaration:
|
||
DESTRUCTOR deduced_params block
|
||
{
|
||
ErrorOr<DestructorDeclaration*> fn =
|
||
DestructorDeclaration::CreateDestructor(
|
||
arena, context.source_loc(), $2,
|
||
arena->New<TuplePattern>(context.source_loc(),
|
||
std::vector<Nonnull<Pattern*>>()),
|
||
ReturnTerm::Omitted(context.source_loc()), $3);
|
||
if (fn.ok()) {
|
||
$$ = *fn;
|
||
} else {
|
||
context.RecordSyntaxError(std::move(fn).error());
|
||
YYERROR;
|
||
}
|
||
}
|
||
;
|
||
declaration_list:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| declaration_list declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(Nonnull<Declaration*>($2));
|
||
}
|
||
;
|
||
class_body:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| class_body declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(Nonnull<Declaration*>($2));
|
||
}
|
||
| class_body mix_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(Nonnull<Declaration*>($2));
|
||
}
|
||
;
|
||
// EXPERIMENTAL MIXIN FEATURE
|
||
mixin_body:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| mixin_body function_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(Nonnull<Declaration*>($2));
|
||
}
|
||
| mixin_body mix_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(Nonnull<Declaration*>($2));
|
||
}
|
||
;
|
||
interface_body:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| interface_body function_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back($2);
|
||
}
|
||
| interface_body LET generic_binding SEMICOLON
|
||
{
|
||
$$ = $1;
|
||
$$.push_back(
|
||
arena->New<AssociatedConstantDeclaration>(context.source_loc(), $3));
|
||
}
|
||
;
|
||
impl_body:
|
||
// Empty
|
||
{ $$ = {}; }
|
||
| impl_body function_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back($2);
|
||
}
|
||
| impl_body alias_declaration
|
||
{
|
||
$$ = $1;
|
||
$$.push_back($2);
|
||
}
|
||
;
|
||
%%
|