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// Copyright 2021 The gVisor 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.
package constraintutil
import (
"go/build/constraint"
"testing"
)
func TestFileParsing(t *testing.T) {
for _, test := range []struct {
name string
data string
expr string
}{
{
name: "Empty",
},
{
name: "NoConstraint",
data: "// copyright header\n\npackage main",
},
{
name: "ConstraintOnFirstLine",
data: "//go:build amd64\n#include \"textflag.h\"",
expr: "amd64",
},
{
name: "ConstraintAfterSlashSlashComment",
data: "// copyright header\n\n//go:build linux\n\npackage newlib",
expr: "linux",
},
{
name: "ConstraintAfterSlashStarComment",
data: "/*\ncopyright header\n*/\n\n//go:build !race\n\npackage oldlib",
expr: "!race",
},
{
name: "ConstraintInSlashSlashComment",
data: "// blah blah //go:build windows",
},
{
name: "ConstraintInSlashStarComment",
data: "/*\n//go:build windows\n*/",
},
{
name: "ConstraintAfterPackageClause",
data: "package oops\n//go:build race",
},
{
name: "ConstraintAfterCppInclude",
data: "#include \"textflag.h\"\n//go:build arm64",
},
} {
t.Run(test.name, func(t *testing.T) {
e, err := FromString(test.data)
if err != nil {
t.Fatalf("FromString(%q) failed: %v", test.data, err)
}
if e == nil {
if len(test.expr) != 0 {
t.Errorf("FromString(%q): got no constraint, wanted %q", test.data, test.expr)
}
} else {
got := e.String()
if len(test.expr) == 0 {
t.Errorf("FromString(%q): got %q, wanted no constraint", test.data, got)
} else if got != test.expr {
t.Errorf("FromString(%q): got %q, wanted %q", test.data, got, test.expr)
}
}
})
}
}
func TestCombine(t *testing.T) {
for _, test := range []struct {
name string
in []string
out string
}{
{
name: "0",
},
{
name: "1",
in: []string{"amd64 || arm64"},
out: "amd64 || arm64",
},
{
name: "2",
in: []string{"amd64", "amd64 && linux"},
out: "amd64 && amd64 && linux",
},
{
name: "3",
in: []string{"amd64", "amd64 || arm64", "amd64 || riscv64"},
out: "amd64 && (amd64 || arm64) && (amd64 || riscv64)",
},
} {
t.Run(test.name, func(t *testing.T) {
inexprs := make([]constraint.Expr, 0, len(test.in))
for _, estr := range test.in {
line := "//go:build " + estr
e, err := constraint.Parse(line)
if err != nil {
t.Fatalf("constraint.Parse(%q) failed: %v", line, err)
}
inexprs = append(inexprs, e)
}
outexpr := Combine(inexprs)
if outexpr == nil {
if len(test.out) != 0 {
t.Errorf("Combine(%v): got no constraint, wanted %q", test.in, test.out)
}
} else {
got := outexpr.String()
if len(test.out) == 0 {
t.Errorf("Combine(%v): got %q, wanted no constraint", test.in, got)
} else if got != test.out {
t.Errorf("Combine(%v): got %q, wanted %q", test.in, got, test.out)
}
}
})
}
}
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