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go/build: clean up ctxt.shouldBuild, tests

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Make ctxt.shouldBuild return multiple values
instead of modifying *sawBinaryOnly in place.
Also give it a table-driven test.

Cleanup in preparation for boolean expressions,
but nice even if those don't end up happening.

Change-Id: Ibb78b0080070deafac7299a6de87ab8bebeb702d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240598
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Russ Cox 2020-05-22 14:40:50 -04:00
parent 112c4d569e
commit 8994607f82
2 changed files with 81 additions and 53 deletions
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21
src/go/build/build.go
View File

@ -1371,8 +1371,8 @@ func (ctxt *Context) matchFile(dir, name string, allTags map[string]bool, binary
}
// Look for +build comments to accept or reject the file.
var sawBinaryOnly bool
if !ctxt.shouldBuild(data, allTags, &sawBinaryOnly) && !ctxt.UseAllFiles {
ok, sawBinaryOnly := ctxt.shouldBuild(data, allTags)
if !ok && !ctxt.UseAllFiles {
return
}
@ -1422,10 +1422,11 @@ var binaryOnlyComment = []byte("//go:binary-only-package")
//
// marks the file as applicable only on Windows and Linux.
//
// If shouldBuild finds a //go:binary-only-package comment in the file,
// it sets *binaryOnly to true. Otherwise it does not change *binaryOnly.
// For each build tag it consults, shouldBuild sets allTags[tag] = true.
//
func (ctxt *Context) shouldBuild(content []byte, allTags map[string]bool, binaryOnly *bool) bool {
// shouldBuild reports whether the file should be built
// and whether a //go:binary-only-package comment was found.
func (ctxt *Context) shouldBuild(content []byte, allTags map[string]bool) (shouldBuild bool, binaryOnly bool) {
sawBinaryOnly := false
// Pass 1. Identify leading run of // comments and blank lines,
@ -1452,7 +1453,7 @@ func (ctxt *Context) shouldBuild(content []byte, allTags map[string]bool, binary
// Pass 2. Process each line in the run.
p = content
allok := true
shouldBuild = true
for len(p) > 0 {
line := p
if i := bytes.IndexByte(line, '\n'); i >= 0 {
@ -1479,17 +1480,13 @@ func (ctxt *Context) shouldBuild(content []byte, allTags map[string]bool, binary
}
}
if !ok {
allok = false
shouldBuild = false
}
}
}
}
if binaryOnly != nil && sawBinaryOnly {
*binaryOnly = true
}
return allok
return shouldBuild, sawBinaryOnly
}
// saveCgo saves the information from the #cgo lines in the import "C" comment.

101
src/go/build/build_test.go
View File

@ -6,6 +6,7 @@ package build
import (
"flag"
"fmt"
"internal/testenv"
"io"
"io/ioutil"
@ -138,48 +139,78 @@ func TestLocalDirectory(t *testing.T) {
}
}
func TestShouldBuild(t *testing.T) {
const file1 = "// +build tag1\n\n" +
"package main\n"
want1 := map[string]bool{"tag1": true}
const file2 = "// +build cgo\n\n" +
var shouldBuildTests = []struct {
content string
tags map[string]bool
binaryOnly bool
shouldBuild bool
}{
{
content: "// +build yes\n\n" +
"package main\n",
tags: map[string]bool{"yes": true},
shouldBuild: true,
},
{
content: "// +build no yes\n\n" +
"package main\n",
tags: map[string]bool{"yes": true, "no": true},
shouldBuild: true,
},
{
content: "// +build no,yes no\n\n" +
"package main\n",
tags: map[string]bool{"yes": true, "no": true},
shouldBuild: false,
},
{
content: "// +build cgo\n\n" +
"// Copyright The Go Authors.\n\n" +
"// This package implements parsing of tags like\n" +
"// +build tag1\n" +
"package build"
want2 := map[string]bool{"cgo": true}
const file3 = "// Copyright The Go Authors.\n\n" +
"package build",
tags: map[string]bool{"cgo": true},
shouldBuild: false,
},
{
content: "// Copyright The Go Authors.\n\n" +
"package build\n\n" +
"// shouldBuild checks tags given by lines of the form\n" +
"// +build tag\n" +
"func shouldBuild(content []byte)\n"
want3 := map[string]bool{}
"func shouldBuild(content []byte)\n",
tags: map[string]bool{},
shouldBuild: true,
},
{
// too close to package line
content: "// +build yes\n" +
"package main\n",
tags: map[string]bool{},
shouldBuild: true,
},
{
// too close to package line
content: "// +build no\n" +
"package main\n",
tags: map[string]bool{},
shouldBuild: true,
},
}
ctx := &Context{BuildTags: []string{"tag1"}}
m := map[string]bool{}
if !ctx.shouldBuild([]byte(file1), m, nil) {
t.Errorf("shouldBuild(file1) = false, want true")
func TestShouldBuild(t *testing.T) {
for i, tt := range shouldBuildTests {
t.Run(fmt.Sprint(i), func(t *testing.T) {
ctx := &Context{BuildTags: []string{"yes"}}
tags := map[string]bool{}
shouldBuild, binaryOnly := ctx.shouldBuild([]byte(tt.content), tags)
if shouldBuild != tt.shouldBuild || binaryOnly != tt.binaryOnly || !reflect.DeepEqual(tags, tt.tags) {
t.Errorf("mismatch:\n"+
"have shouldBuild=%v, binaryOnly=%v, tags=%v\n"+
"want shouldBuild=%v, binaryOnly=%v, tags=%v",
shouldBuild, binaryOnly, tags,
tt.shouldBuild, tt.binaryOnly, tt.tags)
}
if !reflect.DeepEqual(m, want1) {
t.Errorf("shouldBuild(file1) tags = %v, want %v", m, want1)
}
m = map[string]bool{}
if ctx.shouldBuild([]byte(file2), m, nil) {
t.Errorf("shouldBuild(file2) = true, want false")
}
if !reflect.DeepEqual(m, want2) {
t.Errorf("shouldBuild(file2) tags = %v, want %v", m, want2)
}
m = map[string]bool{}
ctx = &Context{BuildTags: nil}
if !ctx.shouldBuild([]byte(file3), m, nil) {
t.Errorf("shouldBuild(file3) = false, want true")
}
if !reflect.DeepEqual(m, want3) {
t.Errorf("shouldBuild(file3) tags = %v, want %v", m, want3)
})
}
}