tokeninternal_test.go

Documentation: golang.org/x/tools/internal/tokeninternal

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package tokeninternal_test
     6  
     7  import (
     8  	"fmt"
     9  	"go/token"
    10  	"strings"
    11  	"testing"
    12  
    13  	"golang.org/x/tools/internal/tokeninternal"
    14  )
    15  
    16  func TestAddExistingFiles(t *testing.T) {
    17  	fset := token.NewFileSet()
    18  
    19  	check := func(descr, want string) {
    20  		t.Helper()
    21  		if got := fsetString(fset); got != want {
    22  			t.Errorf("%s: got %s, want %s", descr, got, want)
    23  		}
    24  	}
    25  
    26  	fileA := fset.AddFile("A", -1, 3)
    27  	fileB := fset.AddFile("B", -1, 5)
    28  	_ = fileB
    29  	check("after AddFile [AB]", "{A:1-4 B:5-10}")
    30  
    31  	tokeninternal.AddExistingFiles(fset, nil)
    32  	check("after AddExistingFiles []", "{A:1-4 B:5-10}")
    33  
    34  	fileC := token.NewFileSet().AddFile("C", 100, 5)
    35  	fileD := token.NewFileSet().AddFile("D", 200, 5)
    36  	tokeninternal.AddExistingFiles(fset, []*token.File{fileC, fileA, fileD, fileC})
    37  	check("after AddExistingFiles [CADC]", "{A:1-4 B:5-10 C:100-105 D:200-205}")
    38  
    39  	fileE := fset.AddFile("E", -1, 3)
    40  	_ = fileE
    41  	check("after AddFile [E]", "{A:1-4 B:5-10 C:100-105 D:200-205 E:206-209}")
    42  }
    43  
    44  func fsetString(fset *token.FileSet) string {
    45  	var buf strings.Builder
    46  	buf.WriteRune('{')
    47  	sep := ""
    48  	fset.Iterate(func(f *token.File) bool {
    49  		fmt.Fprintf(&buf, "%s%s:%d-%d", sep, f.Name(), f.Base(), f.Base()+f.Size())
    50  		sep = " "
    51  		return true
    52  	})
    53  	buf.WriteRune('}')
    54  	return buf.String()
    55  }
    56
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