blob: 7d465dffa621f719f54dcb577db243f6d6fa83d8 [file] [log] [blame]
// Copyright 2010 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.
package token
import (
"fmt"
"math/rand"
"sync"
"testing"
)
func checkPos(t *testing.T, msg string, got, want Position) {
if got.Filename != want.Filename {
t.Errorf("%s: got filename = %q; want %q", msg, got.Filename, want.Filename)
}
if got.Offset != want.Offset {
t.Errorf("%s: got offset = %d; want %d", msg, got.Offset, want.Offset)
}
if got.Line != want.Line {
t.Errorf("%s: got line = %d; want %d", msg, got.Line, want.Line)
}
if got.Column != want.Column {
t.Errorf("%s: got column = %d; want %d", msg, got.Column, want.Column)
}
}
func TestNoPos(t *testing.T) {
if NoPos.IsValid() {
t.Errorf("NoPos should not be valid")
}
var fset *FileSet
checkPos(t, "nil NoPos", fset.Position(NoPos), Position{})
fset = NewFileSet()
checkPos(t, "fset NoPos", fset.Position(NoPos), Position{})
}
var tests = []struct {
filename string
source []byte // may be nil
size int
lines []int
}{
{"a", []byte{}, 0, []int{}},
{"b", []byte("01234"), 5, []int{0}},
{"c", []byte("\n\n\n\n\n\n\n\n\n"), 9, []int{0, 1, 2, 3, 4, 5, 6, 7, 8}},
{"d", nil, 100, []int{0, 5, 10, 20, 30, 70, 71, 72, 80, 85, 90, 99}},
{"e", nil, 777, []int{0, 80, 100, 120, 130, 180, 267, 455, 500, 567, 620}},
{"f", []byte("package p\n\nimport \"fmt\""), 23, []int{0, 10, 11}},
{"g", []byte("package p\n\nimport \"fmt\"\n"), 24, []int{0, 10, 11}},
{"h", []byte("package p\n\nimport \"fmt\"\n "), 25, []int{0, 10, 11, 24}},
}
func linecol(lines []int, offs int) (int, int) {
prevLineOffs := 0
for line, lineOffs := range lines {
if offs < lineOffs {
return line, offs - prevLineOffs + 1
}
prevLineOffs = lineOffs
}
return len(lines), offs - prevLineOffs + 1
}
func verifyPositions(t *testing.T, fset *FileSet, f *File, lines []int) {
for offs := 0; offs < f.Size(); offs++ {
p := f.Pos(offs)
offs2 := f.Offset(p)
if offs2 != offs {
t.Errorf("%s, Offset: got offset %d; want %d", f.Name(), offs2, offs)
}
line, col := linecol(lines, offs)
msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
checkPos(t, msg, f.Position(f.Pos(offs)), Position{f.Name(), offs, line, col})
checkPos(t, msg, fset.Position(p), Position{f.Name(), offs, line, col})
}
}
func makeTestSource(size int, lines []int) []byte {
src := make([]byte, size)
for _, offs := range lines {
if offs > 0 {
src[offs-1] = '\n'
}
}
return src
}
func TestPositions(t *testing.T) {
const delta = 7 // a non-zero base offset increment
fset := NewFileSet()
for _, test := range tests {
// verify consistency of test case
if test.source != nil && len(test.source) != test.size {
t.Errorf("%s: inconsistent test case: got file size %d; want %d", test.filename, len(test.source), test.size)
}
// add file and verify name and size
f := fset.AddFile(test.filename, fset.Base()+delta, test.size)
if f.Name() != test.filename {
t.Errorf("got filename %q; want %q", f.Name(), test.filename)
}
if f.Size() != test.size {
t.Errorf("%s: got file size %d; want %d", f.Name(), f.Size(), test.size)
}
if fset.File(f.Pos(0)) != f {
t.Errorf("%s: f.Pos(0) was not found in f", f.Name())
}
// add lines individually and verify all positions
for i, offset := range test.lines {
f.AddLine(offset)
if f.LineCount() != i+1 {
t.Errorf("%s, AddLine: got line count %d; want %d", f.Name(), f.LineCount(), i+1)
}
// adding the same offset again should be ignored
f.AddLine(offset)
if f.LineCount() != i+1 {
t.Errorf("%s, AddLine: got unchanged line count %d; want %d", f.Name(), f.LineCount(), i+1)
}
verifyPositions(t, fset, f, test.lines[0:i+1])
}
// add lines with SetLines and verify all positions
if ok := f.SetLines(test.lines); !ok {
t.Errorf("%s: SetLines failed", f.Name())
}
if f.LineCount() != len(test.lines) {
t.Errorf("%s, SetLines: got line count %d; want %d", f.Name(), f.LineCount(), len(test.lines))
}
verifyPositions(t, fset, f, test.lines)
// add lines with SetLinesForContent and verify all positions
src := test.source
if src == nil {
// no test source available - create one from scratch
src = makeTestSource(test.size, test.lines)
}
f.SetLinesForContent(src)
if f.LineCount() != len(test.lines) {
t.Errorf("%s, SetLinesForContent: got line count %d; want %d", f.Name(), f.LineCount(), len(test.lines))
}
verifyPositions(t, fset, f, test.lines)
}
}
func TestLineInfo(t *testing.T) {
fset := NewFileSet()
f := fset.AddFile("foo", fset.Base(), 500)
lines := []int{0, 42, 77, 100, 210, 220, 277, 300, 333, 401}
// add lines individually and provide alternative line information
for _, offs := range lines {
f.AddLine(offs)
f.AddLineInfo(offs, "bar", 42)
}
// verify positions for all offsets
for offs := 0; offs <= f.Size(); offs++ {
p := f.Pos(offs)
_, col := linecol(lines, offs)
msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
checkPos(t, msg, f.Position(f.Pos(offs)), Position{"bar", offs, 42, col})
checkPos(t, msg, fset.Position(p), Position{"bar", offs, 42, col})
}
}
func TestFiles(t *testing.T) {
fset := NewFileSet()
for i, test := range tests {
base := fset.Base()
if i%2 == 1 {
// Setting a negative base is equivalent to
// fset.Base(), so test some of each.
base = -1
}
fset.AddFile(test.filename, base, test.size)
j := 0
fset.Iterate(func(f *File) bool {
if f.Name() != tests[j].filename {
t.Errorf("got filename = %s; want %s", f.Name(), tests[j].filename)
}
j++
return true
})
if j != i+1 {
t.Errorf("got %d files; want %d", j, i+1)
}
}
}
// FileSet.File should return nil if Pos is past the end of the FileSet.
func TestFileSetPastEnd(t *testing.T) {
fset := NewFileSet()
for _, test := range tests {
fset.AddFile(test.filename, fset.Base(), test.size)
}
if f := fset.File(Pos(fset.Base())); f != nil {
t.Errorf("got %v, want nil", f)
}
}
func TestFileSetCacheUnlikely(t *testing.T) {
fset := NewFileSet()
offsets := make(map[string]int)
for _, test := range tests {
offsets[test.filename] = fset.Base()
fset.AddFile(test.filename, fset.Base(), test.size)
}
for file, pos := range offsets {
f := fset.File(Pos(pos))
if f.Name() != file {
t.Errorf("got %q at position %d, want %q", f.Name(), pos, file)
}
}
}
// issue 4345. Test that concurrent use of FileSet.Pos does not trigger a
// race in the FileSet position cache.
func TestFileSetRace(t *testing.T) {
fset := NewFileSet()
for i := 0; i < 100; i++ {
fset.AddFile(fmt.Sprintf("file-%d", i), fset.Base(), 1031)
}
max := int32(fset.Base())
var stop sync.WaitGroup
r := rand.New(rand.NewSource(7))
for i := 0; i < 2; i++ {
r := rand.New(rand.NewSource(r.Int63()))
stop.Add(1)
go func() {
for i := 0; i < 1000; i++ {
fset.Position(Pos(r.Int31n(max)))
}
stop.Done()
}()
}
stop.Wait()
}
// issue 16548. Test that concurrent use of File.AddLine and FileSet.PositionFor
// does not trigger a race in the FileSet position cache.
func TestFileSetRace2(t *testing.T) {
const N = 1e3
var (
fset = NewFileSet()
file = fset.AddFile("", -1, N)
ch = make(chan int, 2)
)
go func() {
for i := 0; i < N; i++ {
file.AddLine(i)
}
ch <- 1
}()
go func() {
pos := file.Pos(0)
for i := 0; i < N; i++ {
fset.PositionFor(pos, false)
}
ch <- 1
}()
<-ch
<-ch
}
func TestPositionFor(t *testing.T) {
src := []byte(`
foo
b
ar
//line :100
foobar
//line bar:3
done
`)
const filename = "foo"
fset := NewFileSet()
f := fset.AddFile(filename, fset.Base(), len(src))
f.SetLinesForContent(src)
// verify position info
for i, offs := range f.lines {
got1 := f.PositionFor(f.Pos(offs), false)
got2 := f.PositionFor(f.Pos(offs), true)
got3 := f.Position(f.Pos(offs))
want := Position{filename, offs, i + 1, 1}
checkPos(t, "1. PositionFor unadjusted", got1, want)
checkPos(t, "1. PositionFor adjusted", got2, want)
checkPos(t, "1. Position", got3, want)
}
// manually add //line info on lines l1, l2
const l1, l2 = 5, 7
f.AddLineInfo(f.lines[l1-1], "", 100)
f.AddLineInfo(f.lines[l2-1], "bar", 3)
// unadjusted position info must remain unchanged
for i, offs := range f.lines {
got1 := f.PositionFor(f.Pos(offs), false)
want := Position{filename, offs, i + 1, 1}
checkPos(t, "2. PositionFor unadjusted", got1, want)
}
// adjusted position info should have changed
for i, offs := range f.lines {
got2 := f.PositionFor(f.Pos(offs), true)
got3 := f.Position(f.Pos(offs))
want := Position{filename, offs, i + 1, 1}
// manually compute wanted filename and line
line := want.Line
if i+1 >= l1 {
want.Filename = ""
want.Line = line - l1 + 100
}
if i+1 >= l2 {
want.Filename = "bar"
want.Line = line - l2 + 3
}
checkPos(t, "3. PositionFor adjusted", got2, want)
checkPos(t, "3. Position", got3, want)
}
}
func TestLineStart(t *testing.T) {
const src = "one\ntwo\nthree\n"
fset := NewFileSet()
f := fset.AddFile("input", -1, len(src))
f.SetLinesForContent([]byte(src))
for line := 1; line <= 3; line++ {
pos := f.LineStart(line)
position := fset.Position(pos)
if position.Line != line || position.Column != 1 {
t.Errorf("LineStart(%d) returned wrong pos %d: %s", line, pos, position)
}
}
}