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// 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"
"testing"
)
func checkPos(t *testing.T, msg string, p, q Position) {
if p.Filename != q.Filename {
t.Errorf("%s: expected filename = %q; got %q", msg, q.Filename, p.Filename)
}
if p.Offset != q.Offset {
t.Errorf("%s: expected offset = %d; got %d", msg, q.Offset, p.Offset)
}
if p.Line != q.Line {
t.Errorf("%s: expected line = %d; got %d", msg, q.Line, p.Line)
}
if p.Column != q.Column {
t.Errorf("%s: expected column = %d; got %d", msg, q.Column, p.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: expected offset %d; got %d", f.Name(), offs, offs2)
}
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: expected file size %d; got %d", test.filename, test.size, len(test.source))
}
// add file and verify name and size
f := fset.AddFile(test.filename, fset.Base()+delta, test.size)
if f.Name() != test.filename {
t.Errorf("expected filename %q; got %q", test.filename, f.Name())
}
if f.Size() != test.size {
t.Errorf("%s: expected file size %d; got %d", f.Name(), test.size, f.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: expected line count %d; got %d", f.Name(), i+1, f.LineCount())
}
// adding the same offset again should be ignored
f.AddLine(offset)
if f.LineCount() != i+1 {
t.Errorf("%s, AddLine: expected unchanged line count %d; got %d", f.Name(), i+1, f.LineCount())
}
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: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
}
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: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
}
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 {
fset.AddFile(test.filename, fset.Base(), test.size)
j := 0
for g := range fset.Files() {
if g.Name() != tests[j].filename {
t.Errorf("expected filename = %s; got %s", tests[j].filename, g.Name())
}
j++
}
if j != i+1 {
t.Errorf("expected %d files; got %d", i+1, j)
}
}
}
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