src/tint/lang/wgsl/writer/ast_printer/if_test.cc

// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/lang/wgsl/writer/ast_printer/helper_test.h"

#include "gmock/gmock.h"

namespace tint::wgsl::writer {
namespace {

using WgslASTPrinterTest = TestHelper;

TEST_F(WgslASTPrinterTest, Emit_If) {
    GlobalVar("cond", ty.bool_(), core::AddressSpace::kPrivate);

    auto* cond = Expr("cond");
    auto* body = Block(Return());
    auto* i = If(cond, body);
    WrapInFunction(i);

    ASTPrinter& gen = Build();

    gen.IncrementIndent();

    gen.EmitStatement(i);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(gen.Result(), R"(  if (cond) {
    return;
  }
)");
}

TEST_F(WgslASTPrinterTest, Emit_IfWithElseIf) {
    GlobalVar("cond", ty.bool_(), core::AddressSpace::kPrivate);
    GlobalVar("else_cond", ty.bool_(), core::AddressSpace::kPrivate);

    auto* else_cond = Expr("else_cond");
    auto* else_body = Block(Return());

    auto* cond = Expr("cond");
    auto* body = Block(Return());
    auto* i = If(cond, body, Else(If(else_cond, else_body)));
    WrapInFunction(i);

    ASTPrinter& gen = Build();

    gen.IncrementIndent();

    gen.EmitStatement(i);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(gen.Result(), R"(  if (cond) {
    return;
  } else if (else_cond) {
    return;
  }
)");
}

TEST_F(WgslASTPrinterTest, Emit_IfWithElse) {
    GlobalVar("cond", ty.bool_(), core::AddressSpace::kPrivate);

    auto* else_body = Block(Return());

    auto* cond = Expr("cond");
    auto* body = Block(Return());
    auto* i = If(cond, body, Else(else_body));
    WrapInFunction(i);

    ASTPrinter& gen = Build();

    gen.IncrementIndent();

    gen.EmitStatement(i);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(gen.Result(), R"(  if (cond) {
    return;
  } else {
    return;
  }
)");
}

TEST_F(WgslASTPrinterTest, Emit_IfWithMultiple) {
    GlobalVar("cond", ty.bool_(), core::AddressSpace::kPrivate);
    GlobalVar("else_cond", ty.bool_(), core::AddressSpace::kPrivate);

    auto* else_cond = Expr("else_cond");

    auto* else_body = Block(Return());

    auto* else_body_2 = Block(Return());

    auto* cond = Expr("cond");
    auto* body = Block(Return());
    auto* i = If(cond, body, Else(If(else_cond, else_body, Else(else_body_2))));
    WrapInFunction(i);

    ASTPrinter& gen = Build();

    gen.IncrementIndent();

    gen.EmitStatement(i);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(gen.Result(), R"(  if (cond) {
    return;
  } else if (else_cond) {
    return;
  } else {
    return;
  }
)");
}

}  // namespace
}  // namespace tint::wgsl::writer