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// Copyright 2023 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.
package cnf_test
import (
"testing"
"dawn.googlesource.com/dawn/tools/src/cnf"
"github.com/google/go-cmp/cmp"
)
func TestOptimize(t *testing.T) {
for _, test := range []struct {
in string
out string
}{
// no-ops
{in: `X`, out: `X`},
{in: `X && Y`, out: `X && Y`},
{in: `X && Y && Z`, out: `X && Y && Z`},
{in: `X || Y || Z`, out: `X || Y || Z`},
{in: `(X || Y) && (X || Z)`, out: `(X || Y) && (X || Z)`},
// Sorting
{in: `Z || X || Y`, out: `X || Y || Z`},
{in: `!Z || X || Y`, out: `X || Y || (!Z)`},
{in: `X || !X || Y`, out: `X || (!X) || Y`},
{in: `Z && X && Y`, out: `X && Y && Z`},
{in: `Z && !X && Y`, out: `(!X) && Y && Z`},
// Combine common
{in: `X || Y || X`, out: `X || Y`},
{in: `X && Y && X`, out: `X && Y`},
{in: `X && Y && X`, out: `X && Y`},
{in: `(X || Y) && (X || Y)`, out: `X || Y`},
// Complex cases
{in: `(X || Y) || (Y || Z)`, out: `X || Y || Z`},
{in: `(X || Y) || (Y && Z)`, out: `(X || Y) && (X || Y || Z)`},
{in: `(X && Y) && (Y && Z)`, out: `X && Y && Z`},
{in: `!(X && !(Y || Z)) && Z`, out: `((!X) || Y || Z) && Z`},
{in: `Z || !(X && !(Y || Z))`, out: `(!X) || Y || Z`},
} {
expr, err := cnf.Parse(test.in)
if err != nil {
t.Errorf(`unexpected error returned from Parse('%v'): %v`, test.in, err)
continue
}
opt := cnf.Optimize(expr)
if diff := cmp.Diff(test.out, opt.String()); diff != "" {
t.Errorf("Optimize('%v') returned '%v'. Diff:\n%v", test.in, opt, diff)
}
}
}