serialize_test.go

     1  // Copyright 2011 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 token
     6  
     7  import (
     8  	"bytes"
     9  	"encoding/gob"
    10  	"fmt"
    11  	"slices"
    12  	"testing"
    13  )
    14  
    15  // equal returns nil if p and q describe the same file set;
    16  // otherwise it returns an error describing the discrepancy.
    17  func equal(p, q *FileSet) error {
    18  	if p == q {
    19  		// avoid deadlock if p == q
    20  		return nil
    21  	}
    22  
    23  	// not strictly needed for the test
    24  	p.mutex.Lock()
    25  	q.mutex.Lock()
    26  	defer q.mutex.Unlock()
    27  	defer p.mutex.Unlock()
    28  
    29  	if p.base != q.base {
    30  		return fmt.Errorf("different bases: %d != %d", p.base, q.base)
    31  	}
    32  
    33  	pfiles := slices.Collect(p.tree.all())
    34  	qfiles := slices.Collect(q.tree.all())
    35  	if len(pfiles) != len(qfiles) {
    36  		return fmt.Errorf("different number of files: %d != %d", len(pfiles), len(qfiles))
    37  	}
    38  
    39  	for i, f := range pfiles {
    40  		g := qfiles[i]
    41  		if f.name != g.name {
    42  			return fmt.Errorf("different filenames: %q != %q", f.name, g.name)
    43  		}
    44  		if f.base != g.base {
    45  			return fmt.Errorf("different base for %q: %d != %d", f.name, f.base, g.base)
    46  		}
    47  		if f.size != g.size {
    48  			return fmt.Errorf("different size for %q: %d != %d", f.name, f.size, g.size)
    49  		}
    50  		for j, l := range f.lines {
    51  			m := g.lines[j]
    52  			if l != m {
    53  				return fmt.Errorf("different offsets for %q", f.name)
    54  			}
    55  		}
    56  		for j, l := range f.infos {
    57  			m := g.infos[j]
    58  			if l.Offset != m.Offset || l.Filename != m.Filename || l.Line != m.Line {
    59  				return fmt.Errorf("different infos for %q", f.name)
    60  			}
    61  		}
    62  	}
    63  
    64  	// we don't care about .last - it's just a cache
    65  	return nil
    66  }
    67  
    68  func checkSerialize(t *testing.T, p *FileSet) {
    69  	var buf bytes.Buffer
    70  	encode := func(x any) error {
    71  		return gob.NewEncoder(&buf).Encode(x)
    72  	}
    73  	if err := p.Write(encode); err != nil {
    74  		t.Errorf("writing fileset failed: %s", err)
    75  		return
    76  	}
    77  	q := NewFileSet()
    78  	decode := func(x any) error {
    79  		return gob.NewDecoder(&buf).Decode(x)
    80  	}
    81  	if err := q.Read(decode); err != nil {
    82  		t.Errorf("reading fileset failed: %s", err)
    83  		return
    84  	}
    85  	if err := equal(p, q); err != nil {
    86  		t.Errorf("filesets not identical: %s", err)
    87  	}
    88  }
    89  
    90  func TestSerialization(t *testing.T) {
    91  	p := NewFileSet()
    92  	checkSerialize(t, p)
    93  	// add some files
    94  	for i := range 10 {
    95  		f := p.AddFile(fmt.Sprintf("file%d", i), p.Base()+i, i*100)
    96  		checkSerialize(t, p)
    97  		// add some lines and alternative file infos
    98  		line := 1000
    99  		for offs := 0; offs < f.Size(); offs += 40 + i {
   100  			f.AddLine(offs)
   101  			if offs%7 == 0 {
   102  				f.AddLineInfo(offs, fmt.Sprintf("file%d", offs), line)
   103  				line += 33
   104  			}
   105  		}
   106  		checkSerialize(t, p)
   107  	}
   108  }
   109
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