tint/reader/wgsl: Remove case_body()

This was not used.

Change-Id: Ic79993be201a2f02c6dc2dc8d92d1aea2f382fe4
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/124221
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>

src/tint/BUILD.gn

@@ -1751,7 +1751,6 @@ if (tint_build_unittests) {
       "reader/wgsl/parser_impl_break_stmt_test.cc",
       "reader/wgsl/parser_impl_bug_cases_test.cc",
       "reader/wgsl/parser_impl_call_stmt_test.cc",
-      "reader/wgsl/parser_impl_case_body_test.cc",
       "reader/wgsl/parser_impl_compound_stmt_test.cc",
       "reader/wgsl/parser_impl_const_literal_test.cc",
       "reader/wgsl/parser_impl_continue_stmt_test.cc",

src/tint/CMakeLists.txt

@@ -1104,7 +1104,6 @@ if(TINT_BUILD_TESTS)
       reader/wgsl/parser_impl_break_stmt_test.cc
       reader/wgsl/parser_impl_bug_cases_test.cc
       reader/wgsl/parser_impl_call_stmt_test.cc
-      reader/wgsl/parser_impl_case_body_test.cc
       reader/wgsl/parser_impl_compound_stmt_test.cc
       reader/wgsl/parser_impl_const_literal_test.cc
       reader/wgsl/parser_impl_continue_stmt_test.cc

src/tint/reader/wgsl/parser_impl.cc

@@ -1730,36 +1730,6 @@ Maybe<const ast::CaseSelector*> ParserImpl::case_selector() {
     return create<ast::CaseSelector>(p.source(), expr.value);
 }
 
-// case_body
-//   :
-//   | statement case_body
-Maybe<const ast::BlockStatement*> ParserImpl::case_body() {
-    StatementList stmts;
-    while (continue_parsing()) {
-        Source source;
-        if (match(Token::Type::kFallthrough, &source)) {
-            return add_error(
-                source,
-                "fallthrough is not premitted in WGSL. "
-                "Case can accept multiple selectors if the existing case bodies are empty. "
-                "(e.g. `case 1, 2, 3:`) "
-                "`default` is a valid case selector value. (e.g. `case 1, default:`)");
-        }
-
-        auto stmt = statement();
-        if (stmt.errored) {
-            return Failure::kErrored;
-        }
-        if (!stmt.matched) {
-            break;
-        }
-
-        stmts.Push(stmt.value);
-    }
-
-    return create<ast::BlockStatement>(Source{}, stmts, utils::Empty);
-}
-
 // loop_statement
 //   : LOOP BRACKET_LEFT statements continuing_statement? BRACKET_RIGHT
 Maybe<const ast::LoopStatement*> ParserImpl::loop_statement() {

src/tint/reader/wgsl/parser_impl.h

@@ -509,9 +509,6 @@ class ParserImpl {
     /// Parses a `case_selector` grammar element
     /// @returns the selector
     Maybe<const ast::CaseSelector*> case_selector();
-    /// Parses a `case_body` grammar element
-    /// @returns the parsed statements
-    Maybe<const ast::BlockStatement*> case_body();
     /// Parses a `func_call_statement` grammar element
     /// @returns the parsed function call or nullptr
     Maybe<const ast::CallStatement*> func_call_statement();

src/tint/reader/wgsl/parser_impl_case_body_test.cc

@@ -1,53 +0,0 @@
-// Copyright 2020 The Tint Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "src/tint/reader/wgsl/parser_impl_test_helper.h"
-
-namespace tint::reader::wgsl {
-namespace {
-
-TEST_F(ParserImplTest, CaseBody_Empty) {
-    auto p = parser("");
-    auto e = p->case_body();
-    ASSERT_FALSE(p->has_error()) << p->error();
-    EXPECT_FALSE(e.errored);
-    EXPECT_TRUE(e.matched);
-    EXPECT_EQ(e->statements.Length(), 0u);
-}
-
-TEST_F(ParserImplTest, CaseBody_Statements) {
-    auto p = parser(R"(
-  var a: i32;
-  a = 2;)");
-
-    auto e = p->case_body();
-    ASSERT_FALSE(p->has_error()) << p->error();
-    EXPECT_FALSE(e.errored);
-    EXPECT_TRUE(e.matched);
-    ASSERT_EQ(e->statements.Length(), 2u);
-    EXPECT_TRUE(e->statements[0]->Is<ast::VariableDeclStatement>());
-    EXPECT_TRUE(e->statements[1]->Is<ast::AssignmentStatement>());
-}
-
-TEST_F(ParserImplTest, CaseBody_InvalidStatement) {
-    auto p = parser("a =");
-    auto e = p->case_body();
-    EXPECT_TRUE(p->has_error());
-    EXPECT_TRUE(e.errored);
-    EXPECT_FALSE(e.matched);
-    EXPECT_EQ(e.value, nullptr);
-}
-
-}  // namespace
-}  // namespace tint::reader::wgsl