src/tint/lang/wgsl/reader/parser/enable_directive_test.cc - dawn - Git at Google

 // Copyright 2022 The Dawn & Tint Authors
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 // 1. Redistributions of source code must retain the above copyright notice, this
 //    list of conditions and the following disclaimer.
 //
 // 2. Redistributions in binary form must reproduce the above copyright notice,
 //    this list of conditions and the following disclaimer in the documentation
 //    and/or other materials provided with the distribution.
 //
 // 3. Neither the name of the copyright holder nor the names of its
 //    contributors may be used to endorse or promote products derived from
 //    this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include "src/tint/lang/wgsl/reader/parser/helper_test.h"

 #include "src/tint/lang/wgsl/ast/enable.h"

 namespace tint::wgsl::reader {
 namespace {

 using EnableDirectiveTest = WGSLParserTest;

 // Test a valid enable directive.
 TEST_F(EnableDirectiveTest, Single) {
     auto p = parser("enable f16;");
     p->enable_directive();
     EXPECT_FALSE(p->has_error()) << p->error();
     auto program = p->program();
     auto& ast = program.AST();
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     EXPECT_EQ(enable->source.range.begin.line, 1u);
     EXPECT_EQ(enable->source.range.begin.column, 1u);
     EXPECT_EQ(enable->source.range.end.line, 1u);
     EXPECT_EQ(enable->source.range.end.column, 12u);
     ASSERT_EQ(enable->extensions.Length(), 1u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
 }

 // Test a valid enable directive.
 TEST_F(EnableDirectiveTest, SingleTrailingComma) {
     auto p = parser("enable f16, ;");
     p->enable_directive();
     EXPECT_FALSE(p->has_error()) << p->error();
     auto program = p->program();
     auto& ast = program.AST();
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     EXPECT_EQ(enable->source.range.begin.line, 1u);
     EXPECT_EQ(enable->source.range.begin.column, 1u);
     EXPECT_EQ(enable->source.range.end.line, 1u);
     EXPECT_EQ(enable->source.range.end.column, 14u);
     ASSERT_EQ(enable->extensions.Length(), 1u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
 }

 // Test a valid enable directive with multiple extensions.
 TEST_F(EnableDirectiveTest, Multiple) {
     auto p = parser(
         "enable f16, chromium_disable_uniformity_analysis, chromium_experimental_subgroups;");
     p->enable_directive();
     EXPECT_FALSE(p->has_error()) << p->error();
     auto program = p->program();
     auto& ast = program.AST();
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     ASSERT_EQ(enable->extensions.Length(), 3u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     EXPECT_EQ(enable->extensions[1]->name, wgsl::Extension::kChromiumDisableUniformityAnalysis);
     EXPECT_EQ(enable->extensions[1]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[1]->source.range.begin.column, 13u);
     EXPECT_EQ(enable->extensions[1]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[1]->source.range.end.column, 49u);
     EXPECT_EQ(enable->extensions[2]->name, wgsl::Extension::kChromiumExperimentalSubgroups);
     EXPECT_EQ(enable->extensions[2]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[2]->source.range.begin.column, 51u);
     EXPECT_EQ(enable->extensions[2]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[2]->source.range.end.column, 82u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
 }

 // Test a valid enable directive with multiple extensions.
 TEST_F(EnableDirectiveTest, MultipleTrailingComma) {
     auto p = parser(
         "enable f16, chromium_disable_uniformity_analysis, chromium_experimental_subgroups,;");
     p->enable_directive();
     EXPECT_FALSE(p->has_error()) << p->error();
     auto program = p->program();
     auto& ast = program.AST();
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     ASSERT_EQ(enable->extensions.Length(), 3u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     EXPECT_EQ(enable->extensions[1]->name, wgsl::Extension::kChromiumDisableUniformityAnalysis);
     EXPECT_EQ(enable->extensions[1]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[1]->source.range.begin.column, 13u);
     EXPECT_EQ(enable->extensions[1]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[1]->source.range.end.column, 49u);
     EXPECT_EQ(enable->extensions[2]->name, wgsl::Extension::kChromiumExperimentalSubgroups);
     EXPECT_EQ(enable->extensions[2]->source.range.begin.line, 1u);
     EXPECT_EQ(enable->extensions[2]->source.range.begin.column, 51u);
     EXPECT_EQ(enable->extensions[2]->source.range.end.line, 1u);
     EXPECT_EQ(enable->extensions[2]->source.range.end.column, 82u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
 }

 // Test multiple enable directives for a same extension.
 TEST_F(EnableDirectiveTest, EnableSameLine) {
     auto p = parser(R"(
 enable f16;
 enable f16;
 )");
     p->translation_unit();
     EXPECT_FALSE(p->has_error()) << p->error();
     auto program = p->program();
     auto& ast = program.AST();
     ASSERT_EQ(ast.Enables().Length(), 2u);
     auto* enable_a = ast.Enables()[0];
     auto* enable_b = ast.Enables()[1];
     ASSERT_EQ(enable_a->extensions.Length(), 1u);
     EXPECT_EQ(enable_a->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable_a->extensions[0]->source.range.begin.line, 2u);
     EXPECT_EQ(enable_a->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable_a->extensions[0]->source.range.end.line, 2u);
     EXPECT_EQ(enable_a->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(enable_b->extensions.Length(), 1u);
     EXPECT_EQ(enable_b->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable_b->extensions[0]->source.range.begin.line, 3u);
     EXPECT_EQ(enable_b->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable_b->extensions[0]->source.range.end.line, 3u);
     EXPECT_EQ(enable_b->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 2u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable_a);
     EXPECT_EQ(ast.GlobalDeclarations()[1], enable_b);
 }

 // Test an unknown extension identifier.
 TEST_F(EnableDirectiveTest, InvalidExtension) {
     auto p = parser("enable NotAValidExtensionName;");
     p->enable_directive();
     // Error when unknown extension found
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), R"(1:8: expected extension
 Possible values: 'f16')");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
     EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
 }

 TEST_F(EnableDirectiveTest, InvalidExtensionSuggest) {
     auto p = parser("enable f15;");
     p->enable_directive();
     // Error when unknown extension found
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), R"(1:8: expected extension
 Did you mean 'f16'?
 Possible values: 'f16')");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
     EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
 }

 // Test an unknown extension identifier, starting with 'chromium'
 TEST_F(EnableDirectiveTest, InvalidChromiumExtension) {
     auto p = parser("enable chromium_blah;");
     p->enable_directive();
     // Error when unknown extension found
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), R"(1:8: expected extension
 Possible values: 'chromium_disable_uniformity_analysis', 'chromium_experimental_framebuffer_fetch', 'chromium_experimental_pixel_local', 'chromium_experimental_push_constant', 'chromium_experimental_subgroups', 'chromium_internal_dual_source_blending', 'chromium_internal_graphite', 'chromium_internal_input_attachments', 'chromium_internal_relaxed_uniform_layout', 'f16')");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
     EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
 }

 // Test an enable directive missing ending semicolon.
 TEST_F(EnableDirectiveTest, MissingEndingSemicolon) {
     auto p = parser("enable f16");
     p->translation_unit();
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "1:11: expected ';' for enable directive");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
     EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
 }

 // Test the special error message when enable are used with parenthesis.
 TEST_F(EnableDirectiveTest, ParenthesisSpecialCase) {
     auto p = parser("enable(f16);");
     p->translation_unit();
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "1:7: enable directives don't take parenthesis");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
     EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
 }

 // Test using invalid tokens in an enable directive.
 TEST_F(EnableDirectiveTest, InvalidTokens) {
     {
         auto p = parser("enable f16<;");
         p->translation_unit();
         EXPECT_TRUE(p->has_error());
         EXPECT_EQ(p->error(), "1:11: expected ';' for enable directive");
         auto program = p->program();
         auto& ast = program.AST();
         EXPECT_EQ(ast.Enables().Length(), 0u);
         EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
     }
     {
         auto p = parser("enable <f16;");
         p->translation_unit();
         EXPECT_TRUE(p->has_error());
         EXPECT_EQ(p->error(), R"(1:8: expected extension
 Possible values: 'f16')");
         auto program = p->program();
         auto& ast = program.AST();
         EXPECT_EQ(ast.Enables().Length(), 0u);
         EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
     }
     {
         auto p = parser("enable =;");
         p->translation_unit();
         EXPECT_TRUE(p->has_error());
         EXPECT_EQ(p->error(), R"(1:8: expected extension
 Possible values: 'f16')");
         auto program = p->program();
         auto& ast = program.AST();
         EXPECT_EQ(ast.Enables().Length(), 0u);
         EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
     }
     {
         auto p = parser("enable vec4;");
         p->translation_unit();
         EXPECT_TRUE(p->has_error());
         EXPECT_EQ(p->error(), R"(1:8: expected extension
 Did you mean 'f16'?
 Possible values: 'f16')");
         auto program = p->program();
         auto& ast = program.AST();
         EXPECT_EQ(ast.Enables().Length(), 0u);
         EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
     }
 }

 // Test an enable directive go after other global declarations.
 TEST_F(EnableDirectiveTest, FollowingOtherGlobalDecl) {
     auto p = parser(R"(
 var<private> t: f32 = 0f;
 enable f16;
 )");
     p->translation_unit();
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "3:1: directives must come before all global declarations");
     auto program = p->program();
     auto& ast = program.AST();
     // Accept the enable directive although it caused an error
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     ASSERT_EQ(enable->extensions.Length(), 1u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 3u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 3u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 2u);
     EXPECT_EQ(ast.GlobalDeclarations()[1], enable);
 }

 // Test an enable directive go after an empty semicolon.
 TEST_F(EnableDirectiveTest, FollowingEmptySemicolon) {
     auto p = parser(R"(
 ;
 enable f16;
 )");
     p->translation_unit();
     // An empty semicolon is treated as a global declaration
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "3:1: directives must come before all global declarations");
     auto program = p->program();
     auto& ast = program.AST();
     // Accept the enable directive although it cause an error
     ASSERT_EQ(ast.Enables().Length(), 1u);
     auto* enable = ast.Enables()[0];
     ASSERT_EQ(enable->extensions.Length(), 1u);
     EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 3u);
     EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.line, 3u);
     EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
     ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
     EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
 }

 }  // namespace
 }  // namespace tint::wgsl::reader
	// Copyright 2022 The Dawn & Tint Authors
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// 1. Redistributions of source code must retain the above copyright notice, this
	// list of conditions and the following disclaimer.
	//
	// 2. Redistributions in binary form must reproduce the above copyright notice,
	// this list of conditions and the following disclaimer in the documentation
	// and/or other materials provided with the distribution.
	//
	// 3. Neither the name of the copyright holder nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#include "src/tint/lang/wgsl/reader/parser/helper_test.h"

	#include "src/tint/lang/wgsl/ast/enable.h"

	namespace tint::wgsl::reader {
	namespace {

	using EnableDirectiveTest = WGSLParserTest;

	// Test a valid enable directive.
	TEST_F(EnableDirectiveTest, Single) {
	auto p = parser("enable f16;");
	p->enable_directive();
	EXPECT_FALSE(p->has_error()) << p->error();
	auto program = p->program();
	auto& ast = program.AST();
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	EXPECT_EQ(enable->source.range.begin.line, 1u);
	EXPECT_EQ(enable->source.range.begin.column, 1u);
	EXPECT_EQ(enable->source.range.end.line, 1u);
	EXPECT_EQ(enable->source.range.end.column, 12u);
	ASSERT_EQ(enable->extensions.Length(), 1u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
	}

	// Test a valid enable directive.
	TEST_F(EnableDirectiveTest, SingleTrailingComma) {
	auto p = parser("enable f16, ;");
	p->enable_directive();
	EXPECT_FALSE(p->has_error()) << p->error();
	auto program = p->program();
	auto& ast = program.AST();
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	EXPECT_EQ(enable->source.range.begin.line, 1u);
	EXPECT_EQ(enable->source.range.begin.column, 1u);
	EXPECT_EQ(enable->source.range.end.line, 1u);
	EXPECT_EQ(enable->source.range.end.column, 14u);
	ASSERT_EQ(enable->extensions.Length(), 1u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
	}

	// Test a valid enable directive with multiple extensions.
	TEST_F(EnableDirectiveTest, Multiple) {
	auto p = parser(
	"enable f16, chromium_disable_uniformity_analysis, chromium_experimental_subgroups;");
	p->enable_directive();
	EXPECT_FALSE(p->has_error()) << p->error();
	auto program = p->program();
	auto& ast = program.AST();
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	ASSERT_EQ(enable->extensions.Length(), 3u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	EXPECT_EQ(enable->extensions[1]->name, wgsl::Extension::kChromiumDisableUniformityAnalysis);
	EXPECT_EQ(enable->extensions[1]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[1]->source.range.begin.column, 13u);
	EXPECT_EQ(enable->extensions[1]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[1]->source.range.end.column, 49u);
	EXPECT_EQ(enable->extensions[2]->name, wgsl::Extension::kChromiumExperimentalSubgroups);
	EXPECT_EQ(enable->extensions[2]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[2]->source.range.begin.column, 51u);
	EXPECT_EQ(enable->extensions[2]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[2]->source.range.end.column, 82u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
	}

	// Test a valid enable directive with multiple extensions.
	TEST_F(EnableDirectiveTest, MultipleTrailingComma) {
	auto p = parser(
	"enable f16, chromium_disable_uniformity_analysis, chromium_experimental_subgroups,;");
	p->enable_directive();
	EXPECT_FALSE(p->has_error()) << p->error();
	auto program = p->program();
	auto& ast = program.AST();
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	ASSERT_EQ(enable->extensions.Length(), 3u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	EXPECT_EQ(enable->extensions[1]->name, wgsl::Extension::kChromiumDisableUniformityAnalysis);
	EXPECT_EQ(enable->extensions[1]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[1]->source.range.begin.column, 13u);
	EXPECT_EQ(enable->extensions[1]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[1]->source.range.end.column, 49u);
	EXPECT_EQ(enable->extensions[2]->name, wgsl::Extension::kChromiumExperimentalSubgroups);
	EXPECT_EQ(enable->extensions[2]->source.range.begin.line, 1u);
	EXPECT_EQ(enable->extensions[2]->source.range.begin.column, 51u);
	EXPECT_EQ(enable->extensions[2]->source.range.end.line, 1u);
	EXPECT_EQ(enable->extensions[2]->source.range.end.column, 82u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
	}

	// Test multiple enable directives for a same extension.
	TEST_F(EnableDirectiveTest, EnableSameLine) {
	auto p = parser(R"(
	enable f16;
	enable f16;
	)");
	p->translation_unit();
	EXPECT_FALSE(p->has_error()) << p->error();
	auto program = p->program();
	auto& ast = program.AST();
	ASSERT_EQ(ast.Enables().Length(), 2u);
	auto* enable_a = ast.Enables()[0];
	auto* enable_b = ast.Enables()[1];
	ASSERT_EQ(enable_a->extensions.Length(), 1u);
	EXPECT_EQ(enable_a->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable_a->extensions[0]->source.range.begin.line, 2u);
	EXPECT_EQ(enable_a->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable_a->extensions[0]->source.range.end.line, 2u);
	EXPECT_EQ(enable_a->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(enable_b->extensions.Length(), 1u);
	EXPECT_EQ(enable_b->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable_b->extensions[0]->source.range.begin.line, 3u);
	EXPECT_EQ(enable_b->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable_b->extensions[0]->source.range.end.line, 3u);
	EXPECT_EQ(enable_b->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 2u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable_a);
	EXPECT_EQ(ast.GlobalDeclarations()[1], enable_b);
	}

	// Test an unknown extension identifier.
	TEST_F(EnableDirectiveTest, InvalidExtension) {
	auto p = parser("enable NotAValidExtensionName;");
	p->enable_directive();
	// Error when unknown extension found
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Possible values: 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}

	TEST_F(EnableDirectiveTest, InvalidExtensionSuggest) {
	auto p = parser("enable f15;");
	p->enable_directive();
	// Error when unknown extension found
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Did you mean 'f16'?
	Possible values: 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}

	// Test an unknown extension identifier, starting with 'chromium'
	TEST_F(EnableDirectiveTest, InvalidChromiumExtension) {
	auto p = parser("enable chromium_blah;");
	p->enable_directive();
	// Error when unknown extension found
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Possible values: 'chromium_disable_uniformity_analysis', 'chromium_experimental_framebuffer_fetch', 'chromium_experimental_pixel_local', 'chromium_experimental_push_constant', 'chromium_experimental_subgroups', 'chromium_internal_dual_source_blending', 'chromium_internal_graphite', 'chromium_internal_input_attachments', 'chromium_internal_relaxed_uniform_layout', 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}

	// Test an enable directive missing ending semicolon.
	TEST_F(EnableDirectiveTest, MissingEndingSemicolon) {
	auto p = parser("enable f16");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "1:11: expected ';' for enable directive");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}

	// Test the special error message when enable are used with parenthesis.
	TEST_F(EnableDirectiveTest, ParenthesisSpecialCase) {
	auto p = parser("enable(f16);");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "1:7: enable directives don't take parenthesis");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}

	// Test using invalid tokens in an enable directive.
	TEST_F(EnableDirectiveTest, InvalidTokens) {
	{
	auto p = parser("enable f16<;");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "1:11: expected ';' for enable directive");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}
	{
	auto p = parser("enable <f16;");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Possible values: 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}
	{
	auto p = parser("enable =;");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Possible values: 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}
	{
	auto p = parser("enable vec4;");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), R"(1:8: expected extension
	Did you mean 'f16'?
	Possible values: 'f16')");
	auto program = p->program();
	auto& ast = program.AST();
	EXPECT_EQ(ast.Enables().Length(), 0u);
	EXPECT_EQ(ast.GlobalDeclarations().Length(), 0u);
	}
	}

	// Test an enable directive go after other global declarations.
	TEST_F(EnableDirectiveTest, FollowingOtherGlobalDecl) {
	auto p = parser(R"(
	var<private> t: f32 = 0f;
	enable f16;
	)");
	p->translation_unit();
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "3:1: directives must come before all global declarations");
	auto program = p->program();
	auto& ast = program.AST();
	// Accept the enable directive although it caused an error
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	ASSERT_EQ(enable->extensions.Length(), 1u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 3u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 3u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 2u);
	EXPECT_EQ(ast.GlobalDeclarations()[1], enable);
	}

	// Test an enable directive go after an empty semicolon.
	TEST_F(EnableDirectiveTest, FollowingEmptySemicolon) {
	auto p = parser(R"(
	;
	enable f16;
	)");
	p->translation_unit();
	// An empty semicolon is treated as a global declaration
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "3:1: directives must come before all global declarations");
	auto program = p->program();
	auto& ast = program.AST();
	// Accept the enable directive although it cause an error
	ASSERT_EQ(ast.Enables().Length(), 1u);
	auto* enable = ast.Enables()[0];
	ASSERT_EQ(enable->extensions.Length(), 1u);
	EXPECT_EQ(enable->extensions[0]->name, wgsl::Extension::kF16);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.line, 3u);
	EXPECT_EQ(enable->extensions[0]->source.range.begin.column, 8u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.line, 3u);
	EXPECT_EQ(enable->extensions[0]->source.range.end.column, 11u);
	ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
	EXPECT_EQ(ast.GlobalDeclarations()[0], enable);
	}

	} // namespace
	} // namespace tint::wgsl::reader