353 lines
8.9 KiB
Go
353 lines
8.9 KiB
Go
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package difflib
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import (
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"bytes"
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"fmt"
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"math"
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"reflect"
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"strings"
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"testing"
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)
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func assertAlmostEqual(t *testing.T, a, b float64, places int) {
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if math.Abs(a-b) > math.Pow10(-places) {
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t.Errorf("%.7f != %.7f", a, b)
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}
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}
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func assertEqual(t *testing.T, a, b interface{}) {
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if !reflect.DeepEqual(a, b) {
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t.Errorf("%v != %v", a, b)
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}
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}
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func splitChars(s string) []string {
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chars := make([]string, 0, len(s))
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// Assume ASCII inputs
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for i := 0; i != len(s); i++ {
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chars = append(chars, string(s[i]))
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}
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return chars
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}
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func TestSequenceMatcherRatio(t *testing.T) {
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s := NewMatcher(splitChars("abcd"), splitChars("bcde"))
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assertEqual(t, s.Ratio(), 0.75)
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assertEqual(t, s.QuickRatio(), 0.75)
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assertEqual(t, s.RealQuickRatio(), 1.0)
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}
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func TestGetOptCodes(t *testing.T) {
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a := "qabxcd"
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b := "abycdf"
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s := NewMatcher(splitChars(a), splitChars(b))
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w := &bytes.Buffer{}
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for _, op := range s.GetOpCodes() {
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fmt.Fprintf(w, "%s a[%d:%d], (%s) b[%d:%d] (%s)\n", string(op.Tag),
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op.I1, op.I2, a[op.I1:op.I2], op.J1, op.J2, b[op.J1:op.J2])
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}
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result := string(w.Bytes())
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expected := `d a[0:1], (q) b[0:0] ()
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e a[1:3], (ab) b[0:2] (ab)
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r a[3:4], (x) b[2:3] (y)
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e a[4:6], (cd) b[3:5] (cd)
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i a[6:6], () b[5:6] (f)
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`
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if expected != result {
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t.Errorf("unexpected op codes: \n%s", result)
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}
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}
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func TestGroupedOpCodes(t *testing.T) {
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a := []string{}
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for i := 0; i != 39; i++ {
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a = append(a, fmt.Sprintf("%02d", i))
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}
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b := []string{}
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b = append(b, a[:8]...)
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b = append(b, " i")
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b = append(b, a[8:19]...)
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b = append(b, " x")
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b = append(b, a[20:22]...)
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b = append(b, a[27:34]...)
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b = append(b, " y")
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b = append(b, a[35:]...)
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s := NewMatcher(a, b)
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w := &bytes.Buffer{}
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for _, g := range s.GetGroupedOpCodes(-1) {
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fmt.Fprintf(w, "group\n")
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for _, op := range g {
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fmt.Fprintf(w, " %s, %d, %d, %d, %d\n", string(op.Tag),
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op.I1, op.I2, op.J1, op.J2)
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}
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}
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result := string(w.Bytes())
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expected := `group
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e, 5, 8, 5, 8
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i, 8, 8, 8, 9
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e, 8, 11, 9, 12
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group
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e, 16, 19, 17, 20
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r, 19, 20, 20, 21
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e, 20, 22, 21, 23
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d, 22, 27, 23, 23
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e, 27, 30, 23, 26
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group
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e, 31, 34, 27, 30
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r, 34, 35, 30, 31
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e, 35, 38, 31, 34
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`
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if expected != result {
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t.Errorf("unexpected op codes: \n%s", result)
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}
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}
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func ExampleGetUnifiedDiffString() {
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a := `one
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two
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three
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four`
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b := `zero
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one
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three
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four`
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diff := UnifiedDiff{
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A: SplitLines(a),
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B: SplitLines(b),
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FromFile: "Original",
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FromDate: "2005-01-26 23:30:50",
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ToFile: "Current",
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ToDate: "2010-04-02 10:20:52",
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Context: 3,
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}
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result, _ := GetUnifiedDiffString(diff)
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fmt.Printf(strings.Replace(result, "\t", " ", -1))
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// Output:
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// --- Original 2005-01-26 23:30:50
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// +++ Current 2010-04-02 10:20:52
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// @@ -1,4 +1,4 @@
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// +zero
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// one
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// -two
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// three
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// four
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}
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func ExampleGetContextDiffString() {
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a := `one
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two
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three
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four`
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b := `zero
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one
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tree
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four`
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diff := ContextDiff{
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A: SplitLines(a),
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B: SplitLines(b),
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FromFile: "Original",
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ToFile: "Current",
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Context: 3,
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Eol: "\n",
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}
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result, _ := GetContextDiffString(diff)
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fmt.Printf(strings.Replace(result, "\t", " ", -1))
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// Output:
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// *** Original
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// --- Current
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// ***************
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// *** 1,4 ****
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// one
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// ! two
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// ! three
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// four
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// --- 1,4 ----
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// + zero
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// one
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// ! tree
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// four
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}
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func rep(s string, count int) string {
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return strings.Repeat(s, count)
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}
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func TestWithAsciiOneInsert(t *testing.T) {
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sm := NewMatcher(splitChars(rep("b", 100)),
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splitChars("a"+rep("b", 100)))
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assertAlmostEqual(t, sm.Ratio(), 0.995, 3)
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assertEqual(t, sm.GetOpCodes(),
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[]OpCode{{'i', 0, 0, 0, 1}, {'e', 0, 100, 1, 101}})
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assertEqual(t, len(sm.bPopular), 0)
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sm = NewMatcher(splitChars(rep("b", 100)),
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splitChars(rep("b", 50)+"a"+rep("b", 50)))
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assertAlmostEqual(t, sm.Ratio(), 0.995, 3)
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assertEqual(t, sm.GetOpCodes(),
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[]OpCode{{'e', 0, 50, 0, 50}, {'i', 50, 50, 50, 51}, {'e', 50, 100, 51, 101}})
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assertEqual(t, len(sm.bPopular), 0)
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}
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func TestWithAsciiOnDelete(t *testing.T) {
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sm := NewMatcher(splitChars(rep("a", 40)+"c"+rep("b", 40)),
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splitChars(rep("a", 40)+rep("b", 40)))
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assertAlmostEqual(t, sm.Ratio(), 0.994, 3)
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assertEqual(t, sm.GetOpCodes(),
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[]OpCode{{'e', 0, 40, 0, 40}, {'d', 40, 41, 40, 40}, {'e', 41, 81, 40, 80}})
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}
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func TestWithAsciiBJunk(t *testing.T) {
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isJunk := func(s string) bool {
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return s == " "
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}
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sm := NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
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splitChars(rep("a", 44)+rep("b", 40)), true, isJunk)
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assertEqual(t, sm.bJunk, map[string]struct{}{})
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sm = NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
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splitChars(rep("a", 44)+rep("b", 40)+rep(" ", 20)), false, isJunk)
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assertEqual(t, sm.bJunk, map[string]struct{}{" ": struct{}{}})
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isJunk = func(s string) bool {
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return s == " " || s == "b"
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}
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sm = NewMatcherWithJunk(splitChars(rep("a", 40)+rep("b", 40)),
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splitChars(rep("a", 44)+rep("b", 40)+rep(" ", 20)), false, isJunk)
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assertEqual(t, sm.bJunk, map[string]struct{}{" ": struct{}{}, "b": struct{}{}})
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}
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func TestSFBugsRatioForNullSeqn(t *testing.T) {
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sm := NewMatcher(nil, nil)
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assertEqual(t, sm.Ratio(), 1.0)
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assertEqual(t, sm.QuickRatio(), 1.0)
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assertEqual(t, sm.RealQuickRatio(), 1.0)
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}
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func TestSFBugsComparingEmptyLists(t *testing.T) {
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groups := NewMatcher(nil, nil).GetGroupedOpCodes(-1)
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assertEqual(t, len(groups), 0)
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diff := UnifiedDiff{
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FromFile: "Original",
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ToFile: "Current",
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Context: 3,
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}
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result, err := GetUnifiedDiffString(diff)
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assertEqual(t, err, nil)
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assertEqual(t, result, "")
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}
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func TestOutputFormatRangeFormatUnified(t *testing.T) {
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// Per the diff spec at http://www.unix.org/single_unix_specification/
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//
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// Each <range> field shall be of the form:
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// %1d", <beginning line number> if the range contains exactly one line,
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// and:
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// "%1d,%1d", <beginning line number>, <number of lines> otherwise.
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// If a range is empty, its beginning line number shall be the number of
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// the line just before the range, or 0 if the empty range starts the file.
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fm := formatRangeUnified
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assertEqual(t, fm(3, 3), "3,0")
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assertEqual(t, fm(3, 4), "4")
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assertEqual(t, fm(3, 5), "4,2")
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assertEqual(t, fm(3, 6), "4,3")
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assertEqual(t, fm(0, 0), "0,0")
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}
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func TestOutputFormatRangeFormatContext(t *testing.T) {
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// Per the diff spec at http://www.unix.org/single_unix_specification/
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//
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// The range of lines in file1 shall be written in the following format
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// if the range contains two or more lines:
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// "*** %d,%d ****\n", <beginning line number>, <ending line number>
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// and the following format otherwise:
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// "*** %d ****\n", <ending line number>
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// The ending line number of an empty range shall be the number of the preceding line,
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// or 0 if the range is at the start of the file.
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//
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// Next, the range of lines in file2 shall be written in the following format
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// if the range contains two or more lines:
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// "--- %d,%d ----\n", <beginning line number>, <ending line number>
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// and the following format otherwise:
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// "--- %d ----\n", <ending line number>
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fm := formatRangeContext
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assertEqual(t, fm(3, 3), "3")
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assertEqual(t, fm(3, 4), "4")
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assertEqual(t, fm(3, 5), "4,5")
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assertEqual(t, fm(3, 6), "4,6")
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assertEqual(t, fm(0, 0), "0")
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}
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func TestOutputFormatTabDelimiter(t *testing.T) {
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diff := UnifiedDiff{
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A: splitChars("one"),
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B: splitChars("two"),
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FromFile: "Original",
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FromDate: "2005-01-26 23:30:50",
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ToFile: "Current",
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ToDate: "2010-04-12 10:20:52",
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Eol: "\n",
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}
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ud, err := GetUnifiedDiffString(diff)
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assertEqual(t, err, nil)
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assertEqual(t, SplitLines(ud)[:2], []string{
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"--- Original\t2005-01-26 23:30:50\n",
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"+++ Current\t2010-04-12 10:20:52\n",
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})
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cd, err := GetContextDiffString(ContextDiff(diff))
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assertEqual(t, err, nil)
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assertEqual(t, SplitLines(cd)[:2], []string{
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"*** Original\t2005-01-26 23:30:50\n",
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"--- Current\t2010-04-12 10:20:52\n",
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})
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}
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func TestOutputFormatNoTrailingTabOnEmptyFiledate(t *testing.T) {
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diff := UnifiedDiff{
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A: splitChars("one"),
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B: splitChars("two"),
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FromFile: "Original",
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ToFile: "Current",
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Eol: "\n",
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}
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ud, err := GetUnifiedDiffString(diff)
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assertEqual(t, err, nil)
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assertEqual(t, SplitLines(ud)[:2], []string{"--- Original\n", "+++ Current\n"})
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cd, err := GetContextDiffString(ContextDiff(diff))
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assertEqual(t, err, nil)
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assertEqual(t, SplitLines(cd)[:2], []string{"*** Original\n", "--- Current\n"})
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}
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func TestSplitLines(t *testing.T) {
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allTests := []struct {
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input string
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want []string
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}{
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{"foo", []string{"foo\n"}},
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{"foo\nbar", []string{"foo\n", "bar\n"}},
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{"foo\nbar\n", []string{"foo\n", "bar\n", "\n"}},
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}
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for _, test := range allTests {
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assertEqual(t, SplitLines(test.input), test.want)
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}
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}
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func benchmarkSplitLines(b *testing.B, count int) {
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str := strings.Repeat("foo\n", count)
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b.ResetTimer()
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n := 0
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for i := 0; i < b.N; i++ {
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n += len(SplitLines(str))
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}
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}
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func BenchmarkSplitLines100(b *testing.B) {
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benchmarkSplitLines(b, 100)
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}
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func BenchmarkSplitLines10000(b *testing.B) {
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benchmarkSplitLines(b, 10000)
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}
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