go filter_test 源码
golang filter_test 代码
文件路径：/src/go/ast/filter_test.go
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// To avoid a cyclic dependency with go/parser, this file is in a separate package.
package ast_test
import (
"bytes"
"go/ast"
"go/format"
"go/parser"
"go/token"
"testing"
)
const input = `package p
type t1 struct{}
type t2 struct{}
func f1() {}
func f1() {}
func f2() {}
func (*t1) f1() {}
func (t1) f1() {}
func (t1) f2() {}
func (t2) f1() {}
func (t2) f2() {}
func (x *t2) f2() {}
`
// Calling ast.MergePackageFiles with ast.FilterFuncDuplicates
// keeps a duplicate entry with attached documentation in favor
// of one without, and it favors duplicate entries appearing
// later in the source over ones appearing earlier. This is why
// (*t2).f2 is kept and t2.f2 is eliminated in this test case.
const golden = `package p
type t1 struct{}
type t2 struct{}
func f1() {}
func f2() {}
func (t1) f1() {}
func (t1) f2() {}
func (t2) f1() {}
func (x *t2) f2() {}
`
func TestFilterDuplicates(t *testing.T) {
// parse input
fset := token.NewFileSet()
file, err := parser.ParseFile(fset, "", input, 0)
if err != nil {
t.Fatal(err)
}
// create package
files := map[string]*ast.File{"": file}
pkg, err := ast.NewPackage(fset, files, nil, nil)
if err != nil {
t.Fatal(err)
}
// filter
merged := ast.MergePackageFiles(pkg, ast.FilterFuncDuplicates)
// pretty-print
var buf bytes.Buffer
if err := format.Node(&buf, fset, merged); err != nil {
t.Fatal(err)
}
output := buf.String()
if output != golden {
t.Errorf("incorrect output:\n%s", output)
}
}
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