src/tint/lang/wgsl/resolver/swizzle_assignment_test.cc

// Copyright 2026 The Dawn & Tint Authors
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#include "src/tint/lang/core/enums.h"
#include "src/tint/lang/wgsl/resolver/resolver.h"
#include "src/tint/lang/wgsl/resolver/resolver_helper_test.h"

using namespace tint::core::fluent_types;     // NOLINT
using namespace tint::core::number_suffixes;  // NOLINT

namespace tint::resolver {
namespace {

using ResolverSwizzleAssignmentTest = ResolverTest;

TEST_F(ResolverSwizzleAssignmentTest, LanguageFeatureDisabled) {
    // var v : vec4f;
    // v.xy = vec2(1);
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);

    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, "v", "xy"), Call<vec2<f32>>(1_f)));

    wgsl::AllowedFeatures allowed_features{};

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(
        resolver.error(),
        R"(1:2 error: cannot assign to value of type 'swizzle<private, vec2<f32>, read_write, 4, 2>')");
}

TEST_F(ResolverSwizzleAssignmentTest, SimpleSwizzleAssignment) {
    // var v : vec4f;
    // v.xy = vec2(1);
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{3, 4}}, "v", "xy"), Call<vec2<f32>>(1_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, SingleElementChainedSwizzle) {
    // var v : vec3u;
    // v.xyz.y = 1;
    GlobalVar("v", ty.vec3<u32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "xyz"), "y"), 1_u));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, MultiElementChainedSwizzle) {
    // var v : vec3i;
    // v.zyx.xy = vec2(1, 2);
    GlobalVar("v", ty.vec3<i32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "zyx"), "xy"),
                          Call<vec2<i32>>(1_i, 2_i)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, InvalidVectorSwizzleAssignmentFails) {
    // var v : vec2f;
    // v.yz = vec2(1, 2);
    GlobalVar("v", ty.vec2<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(
        Assign(MemberAccessor("v", Ident(Source{{1, 2}}, "yz")), Call<vec2<f32>>(1_f, 2_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(resolver.error(), R"(1:2 error: invalid vector swizzle member)");
}

TEST_F(ResolverSwizzleAssignmentTest, InvalidDuplicateComponents) {
    // var v : vec4f;
    // v.xx = vec2(1, 2);
    GlobalVar("v", ty.vec2<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, "v", "xx"), Call<vec2<f32>>(1_f, 2_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(r()->error(),
              "1:2 error: cannot assign to vector swizzle with duplicate target components");
}

TEST_F(ResolverSwizzleAssignmentTest, DuplicateComponentsChainedSwizzle_SingleUnique) {
    // var v : vec4f;
    // v.xxy.x = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "xxy"), "x"), 1_f));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, DuplicateComponentsChainedSwizzle_MultipleUnique) {
    // var v : vec4f;
    // v.xyy.xy = vec2(1.0, 2.0);
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "xyy"), "xy"),
                          Call<vec2<f32>>(1_f, 2_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, DuplicateComponentsChainedSwizzle_Multiple) {
    // var v : vec4f;
    // v.xyy.yy = vec2(1.0, 2.0);
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "xyy"), "yy"),
                          Call<vec2<f32>>(1_f, 2_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(r()->error(),
              "1:2 error: cannot assign to vector swizzle with duplicate target components");
}

TEST_F(ResolverSwizzleAssignmentTest, DuplicateComponentsChainedSwizzle_MultipleNonUnique) {
    // var v : vec4f;
    // v.xxyy.xy = vec2(1.0, 2.0);
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(MemberAccessor(Source{{1, 2}}, MemberAccessor("v", "xxyy"), "xy"),
                          Call<vec2<f32>>(1_f, 2_f)));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(r()->error(),
              "1:2 error: cannot assign to vector swizzle with duplicate target components");
}

TEST_F(ResolverSwizzleAssignmentTest, SwizzleAssignment_Indexed) {
    // var v : vec4f;
    // v.xyz[1] = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(IndexAccessor(MemberAccessor("v", "xyz"), 1_i), 1_f));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, SwizzleAssignment_IndexedDynamic) {
    // var v : vec4f;
    // var i : i32;
    // v.xyz[i] = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    auto* i = Var("i", ty.i32(), core::AddressSpace::kFunction);
    auto* assign = Assign(IndexAccessor(MemberAccessor("v", "xyz"), "i"), 1_f);
    WrapInFunction(i, assign);

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, SwizzleAssignment_Indexed_ValidInterimDuplicate) {
    // var v : vec4f;
    // v.xx[0] = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(IndexAccessor(MemberAccessor("v", "xx"), 0_i), 1_f));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_TRUE(resolver.Resolve()) << resolver.error();
}

TEST_F(ResolverSwizzleAssignmentTest, SwizzleAssignment_IndexSize1) {
    // var v : vec4f;
    // v.x[0] = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(IndexAccessor(MemberAccessor("v", "x"), 0_i), 1_f));

    wgsl::AllowedFeatures allowed_features{};
    allowed_features.features.insert(wgsl::LanguageFeature::kSwizzleAssignment);

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(resolver.error(), "error: cannot index type 'f32'");
}

TEST_F(ResolverSwizzleAssignmentTest, SwizzleAssignment_Indexed_FeatureDisabled) {
    // var v : vec4f;
    // v.xyz[1] = 1.0;
    GlobalVar("v", ty.vec4<f32>(), core::AddressSpace::kPrivate);
    WrapInFunction(Assign(IndexAccessor(MemberAccessor("v", "xyz"), 1_i), 1_f));

    wgsl::AllowedFeatures allowed_features{};

    Resolver resolver{this, allowed_features};
    EXPECT_FALSE(resolver.Resolve());
    EXPECT_EQ(resolver.error(),
              R"(error: cannot assign to value of type 'swizzle<private, f32, read_write, 3, 1>')");
}

}  // namespace
}  // namespace tint::resolver