How to use Format method of diff Package

Best Got code snippet using diff.Format

report_compare.go

Source:report_compare.go

...26	// (i.e., structs, slices, arrays, and maps).27	autoType28)29type formatOptions struct {30	// DiffMode controls the output mode of FormatDiff.31	//32	// If diffUnknown,   then produce a diff of the x and y values.33	// If diffIdentical, then emit values as if they were equal.34	// If diffRemoved,   then only emit x values (ignoring y values).35	// If diffInserted,  then only emit y values (ignoring x values).36	DiffMode diffMode37	// TypeMode controls whether to print the type for the current node.38	//39	// As a general rule of thumb, we always print the type of the next node40	// after an interface, and always elide the type of the next node after41	// a slice or map node.42	TypeMode typeMode43	// formatValueOptions are options specific to printing reflect.Values.44	formatValueOptions45}46func (opts formatOptions) WithDiffMode(d diffMode) formatOptions {47	opts.DiffMode = d48	return opts49}50func (opts formatOptions) WithTypeMode(t typeMode) formatOptions {51	opts.TypeMode = t52	return opts53}54func (opts formatOptions) WithVerbosity(level int) formatOptions {55	opts.VerbosityLevel = level56	opts.LimitVerbosity = true57	return opts58}59func (opts formatOptions) verbosity() uint {60	switch {61	case opts.VerbosityLevel < 0:62		return 063	case opts.VerbosityLevel > 16:64		return 16 // some reasonable maximum to avoid shift overflow65	default:66		return uint(opts.VerbosityLevel)67	}68}69const maxVerbosityPreset = 670// verbosityPreset modifies the verbosity settings given an index71// between 0 and maxVerbosityPreset, inclusive.72func verbosityPreset(opts formatOptions, i int) formatOptions {73	opts.VerbosityLevel = int(opts.verbosity()) + 2*i74	if i > 0 {75		opts.AvoidStringer = true76	}77	if i >= maxVerbosityPreset {78		opts.PrintAddresses = true79		opts.QualifiedNames = true80	}81	return opts82}83// FormatDiff converts a valueNode tree into a textNode tree, where the later84// is a textual representation of the differences detected in the former.85func (opts formatOptions) FormatDiff(v *valueNode, ptrs *pointerReferences) (out textNode) {86	if opts.DiffMode == diffIdentical {87		opts = opts.WithVerbosity(1)88	} else if opts.verbosity() < 3 {89		opts = opts.WithVerbosity(3)90	}91	// Check whether we have specialized formatting for this node.92	// This is not necessary, but helpful for producing more readable outputs.93	if opts.CanFormatDiffSlice(v) {94		return opts.FormatDiffSlice(v)95	}96	var parentKind reflect.Kind97	if v.parent != nil && v.parent.TransformerName == "" {98		parentKind = v.parent.Type.Kind()99	}100	// For leaf nodes, format the value based on the reflect.Values alone.101	if v.MaxDepth == 0 {102		switch opts.DiffMode {103		case diffUnknown, diffIdentical:104			// Format Equal.105			if v.NumDiff == 0 {106				outx := opts.FormatValue(v.ValueX, parentKind, ptrs)107				outy := opts.FormatValue(v.ValueY, parentKind, ptrs)108				if v.NumIgnored > 0 && v.NumSame == 0 {109					return textEllipsis110				} else if outx.Len() < outy.Len() {111					return outx112				} else {113					return outy114				}115			}116			// Format unequal.117			assert(opts.DiffMode == diffUnknown)118			var list textList119			outx := opts.WithTypeMode(elideType).FormatValue(v.ValueX, parentKind, ptrs)120			outy := opts.WithTypeMode(elideType).FormatValue(v.ValueY, parentKind, ptrs)121			for i := 0; i <= maxVerbosityPreset && outx != nil && outy != nil && outx.Equal(outy); i++ {122				opts2 := verbosityPreset(opts, i).WithTypeMode(elideType)123				outx = opts2.FormatValue(v.ValueX, parentKind, ptrs)124				outy = opts2.FormatValue(v.ValueY, parentKind, ptrs)125			}126			if outx != nil {127				list = append(list, textRecord{Diff: '-', Value: outx})128			}129			if outy != nil {130				list = append(list, textRecord{Diff: '+', Value: outy})131			}132			return opts.WithTypeMode(emitType).FormatType(v.Type, list)133		case diffRemoved:134			return opts.FormatValue(v.ValueX, parentKind, ptrs)135		case diffInserted:136			return opts.FormatValue(v.ValueY, parentKind, ptrs)137		default:138			panic("invalid diff mode")139		}140	}141	// Register slice element to support cycle detection.142	if parentKind == reflect.Slice {143		ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, true)144		defer ptrs.Pop()145		defer func() { out = wrapTrunkReferences(ptrRefs, out) }()146	}147	// Descend into the child value node.148	if v.TransformerName != "" {149		out := opts.WithTypeMode(emitType).FormatDiff(v.Value, ptrs)150		out = &textWrap{Prefix: "Inverse(" + v.TransformerName + ", ", Value: out, Suffix: ")"}151		return opts.FormatType(v.Type, out)152	} else {153		switch k := v.Type.Kind(); k {154		case reflect.Struct, reflect.Array, reflect.Slice:155			out = opts.formatDiffList(v.Records, k, ptrs)156			out = opts.FormatType(v.Type, out)157		case reflect.Map:158			// Register map to support cycle detection.159			ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, false)160			defer ptrs.Pop()161			out = opts.formatDiffList(v.Records, k, ptrs)162			out = wrapTrunkReferences(ptrRefs, out)163			out = opts.FormatType(v.Type, out)164		case reflect.Ptr:165			// Register pointer to support cycle detection.166			ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, false)167			defer ptrs.Pop()168			out = opts.FormatDiff(v.Value, ptrs)169			out = wrapTrunkReferences(ptrRefs, out)170			out = &textWrap{Prefix: "&", Value: out}171		case reflect.Interface:172			out = opts.WithTypeMode(emitType).FormatDiff(v.Value, ptrs)173		default:174			panic(fmt.Sprintf("%v cannot have children", k))175		}176		return out177	}178}179func (opts formatOptions) formatDiffList(recs []reportRecord, k reflect.Kind, ptrs *pointerReferences) textNode {180	// Derive record name based on the data structure kind.181	var name string182	var formatKey func(reflect.Value) string183	switch k {184	case reflect.Struct:185		name = "field"186		opts = opts.WithTypeMode(autoType)187		formatKey = func(v reflect.Value) string { return v.String() }188	case reflect.Slice, reflect.Array:189		name = "element"190		opts = opts.WithTypeMode(elideType)191		formatKey = func(reflect.Value) string { return "" }192	case reflect.Map:193		name = "entry"194		opts = opts.WithTypeMode(elideType)195		formatKey = func(v reflect.Value) string { return formatMapKey(v, false, ptrs) }196	}197	maxLen := -1198	if opts.LimitVerbosity {199		if opts.DiffMode == diffIdentical {200			maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...201		} else {202			maxLen = (1 << opts.verbosity()) << 1 // 2, 4, 8, 16, 32, 64, etc...203		}204		opts.VerbosityLevel--205	}206	// Handle unification.207	switch opts.DiffMode {208	case diffIdentical, diffRemoved, diffInserted:209		var list textList210		var deferredEllipsis bool // Add final "..." to indicate records were dropped211		for _, r := range recs {212			if len(list) == maxLen {213				deferredEllipsis = true214				break215			}216			// Elide struct fields that are zero value.217			if k == reflect.Struct {218				var isZero bool219				switch opts.DiffMode {220				case diffIdentical:221					isZero = value.IsZero(r.Value.ValueX) || value.IsZero(r.Value.ValueY)222				case diffRemoved:223					isZero = value.IsZero(r.Value.ValueX)224				case diffInserted:225					isZero = value.IsZero(r.Value.ValueY)226				}227				if isZero {228					continue229				}230			}231			// Elide ignored nodes.232			if r.Value.NumIgnored > 0 && r.Value.NumSame+r.Value.NumDiff == 0 {233				deferredEllipsis = !(k == reflect.Slice || k == reflect.Array)234				if !deferredEllipsis {235					list.AppendEllipsis(diffStats{})236				}237				continue238			}239			if out := opts.FormatDiff(r.Value, ptrs); out != nil {240				list = append(list, textRecord{Key: formatKey(r.Key), Value: out})241			}242		}243		if deferredEllipsis {244			list.AppendEllipsis(diffStats{})245		}246		return &textWrap{Prefix: "{", Value: list, Suffix: "}"}247	case diffUnknown:248	default:249		panic("invalid diff mode")250	}251	// Handle differencing.252	var numDiffs int253	var list textList254	var keys []reflect.Value // invariant: len(list) == len(keys)255	groups := coalesceAdjacentRecords(name, recs)256	maxGroup := diffStats{Name: name}257	for i, ds := range groups {258		if maxLen >= 0 && numDiffs >= maxLen {259			maxGroup = maxGroup.Append(ds)260			continue261		}262		// Handle equal records.263		if ds.NumDiff() == 0 {264			// Compute the number of leading and trailing records to print.265			var numLo, numHi int266			numEqual := ds.NumIgnored + ds.NumIdentical267			for numLo < numContextRecords && numLo+numHi < numEqual && i != 0 {268				if r := recs[numLo].Value; r.NumIgnored > 0 && r.NumSame+r.NumDiff == 0 {269					break270				}271				numLo++272			}273			for numHi < numContextRecords && numLo+numHi < numEqual && i != len(groups)-1 {274				if r := recs[numEqual-numHi-1].Value; r.NumIgnored > 0 && r.NumSame+r.NumDiff == 0 {275					break276				}277				numHi++278			}279			if numEqual-(numLo+numHi) == 1 && ds.NumIgnored == 0 {280				numHi++ // Avoid pointless coalescing of a single equal record281			}282			// Format the equal values.283			for _, r := range recs[:numLo] {284				out := opts.WithDiffMode(diffIdentical).FormatDiff(r.Value, ptrs)285				list = append(list, textRecord{Key: formatKey(r.Key), Value: out})286				keys = append(keys, r.Key)287			}288			if numEqual > numLo+numHi {289				ds.NumIdentical -= numLo + numHi290				list.AppendEllipsis(ds)291				for len(keys) < len(list) {292					keys = append(keys, reflect.Value{})293				}294			}295			for _, r := range recs[numEqual-numHi : numEqual] {296				out := opts.WithDiffMode(diffIdentical).FormatDiff(r.Value, ptrs)297				list = append(list, textRecord{Key: formatKey(r.Key), Value: out})298				keys = append(keys, r.Key)299			}300			recs = recs[numEqual:]301			continue302		}303		// Handle unequal records.304		for _, r := range recs[:ds.NumDiff()] {305			switch {306			case opts.CanFormatDiffSlice(r.Value):307				out := opts.FormatDiffSlice(r.Value)308				list = append(list, textRecord{Key: formatKey(r.Key), Value: out})309				keys = append(keys, r.Key)310			case r.Value.NumChildren == r.Value.MaxDepth:311				outx := opts.WithDiffMode(diffRemoved).FormatDiff(r.Value, ptrs)312				outy := opts.WithDiffMode(diffInserted).FormatDiff(r.Value, ptrs)313				for i := 0; i <= maxVerbosityPreset && outx != nil && outy != nil && outx.Equal(outy); i++ {314					opts2 := verbosityPreset(opts, i)315					outx = opts2.WithDiffMode(diffRemoved).FormatDiff(r.Value, ptrs)316					outy = opts2.WithDiffMode(diffInserted).FormatDiff(r.Value, ptrs)317				}318				if outx != nil {319					list = append(list, textRecord{Diff: diffRemoved, Key: formatKey(r.Key), Value: outx})320					keys = append(keys, r.Key)321				}322				if outy != nil {323					list = append(list, textRecord{Diff: diffInserted, Key: formatKey(r.Key), Value: outy})324					keys = append(keys, r.Key)325				}326			default:327				out := opts.FormatDiff(r.Value, ptrs)328				list = append(list, textRecord{Key: formatKey(r.Key), Value: out})329				keys = append(keys, r.Key)330			}331		}332		recs = recs[ds.NumDiff():]333		numDiffs += ds.NumDiff()334	}335	if maxGroup.IsZero() {336		assert(len(recs) == 0)337	} else {338		list.AppendEllipsis(maxGroup)339		for len(keys) < len(list) {340			keys = append(keys, reflect.Value{})341		}...

Format

Using AI Code Generation

1import (2func main() {3    dmp := diffmatchpatch.New()4    d := dmp.DiffMain(a, b, false)5    fmt.Println(dmp.DiffPrettyText(d))6}

Format

Using AI Code Generation

1import (2func main() {3    dmp := diffmatchpatch.New()4    d := dmp.DiffMain(a, b, false)5    fmt.Println(dmp.DiffPrettyText(d))6}7import (8func main() {9    dmp := diffmatchpatch.New()10    d := dmp.DiffMain(a, b, false)11    fmt.Println(dmp.DiffToDelta(d))12}

Format

Using AI Code Generation

1import (2func main() {3    dmp := diffmatchpatch.New()4    d := dmp.DiffMain(a, b, false)5    fmt.Println(dmp.DiffPrettyText(d))6}7import (8func main() {9    dmp := diffmatchpatch.New()10    d := dmp.DiffMain(a, b, false)11    fmt.Println(dmp.DiffText1(d))12    fmt.Println(dmp.DiffText2(d))13}14import (15func main() {16    dmp := diffmatchpatch.New()17    d := dmp.DiffMain(a, b, false)18    chars1, chars2, lineArray := dmp.DiffCharsToLines(dmp.DiffText1(d), dmp.DiffText2(d))19    d = dmp.DiffMain(chars1, chars2, false)20    fmt.Println(dmp.DiffPrettyText(d))21    fmt.Println(dmp.DiffCharsToLines(d, lineArray))22}

Format

Using AI Code Generation

1import (2func main() {3    dmp := diffmatchpatch.New()4    d := dmp.DiffMain(a, b, false)5    fmt.Println(dmp.DiffPrettyText(d))6}7import (8func main() {9    dmp := diffmatchpatch.New()10    d := dmp.DiffLinesToChars(a, b)11    fmt.Println(dmp.DiffPrettyText(d))12}13import (14func main() {15    dmp := diffmatchpatch.New()16    d := dmp.DiffCharsToLines(a, b)17    fmt.Println(dmp.DiffPrettyText(d))18}19import (20func main() {21    dmp := diffmatchpatch.New()22    d := dmp.DiffCommonPrefix(a, b)23    fmt.Println(dmp.DiffPrettyText(d))24}25import (26func main() {27    dmp := diffmatchpatch.New()28    d := dmp.DiffCommonSuffix(a, b)29    fmt.Println(dmp.DiffPrettyText(d))30}

Format

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	a := []int{1, 2, 3}5	b := []int{1, 2, 4}6	fmt.Println(cmp.Diff(a, b))7}8import (9func main() {10	fmt.Println("Hello, playground")11	a := []int{1, 2, 3}12	b := []int{1, 2, 4}13	fmt.Println(cmp.Diff(a, b))14}15import (16func main() {17	fmt.Println("Hello, playground")18	a := []int{1, 2, 3}19	b := []int{1, 2, 4}20	fmt.Println(cmp.Diff(a, b))21}22import (23func main() {24	fmt.Println("Hello, playground")25	a := []int{1, 2, 3}26	b := []int{1, 2, 4}27	fmt.Println(cmp.Diff(a, b))28}29import (

Format

Using AI Code Generation

1import (2func main() {3	dmp := diffmatchpatch.New()4	diffs := dmp.DiffMain(a, b, false)5	fmt.Println(diffs)6	fmt.Println(dmp.DiffPrettyText(diffs))7}

Format

Using AI Code Generation

1import "fmt"2import "strings"3import "golang.org/x/tools/go/diff/diffmatchpatch"4func main() {5    dmp := diffmatchpatch.New()6    d := dmp.DiffMain(text1, text2, false)7    fmt.Println(dmp.DiffPrettyText(d))8}

Format

Using AI Code Generation

1import (2func main() {3	dmp := diffmatchpatch.New()4	diffs := dmp.DiffMain(a, b, false)5	fmt.Println(dmp.DiffPrettyText(diffs))6}7import (8func main() {9	dmp := diffmatchpatch.New()10	diffs := dmp.DiffMain(a, b, false)11	fmt.Println(dmp.DiffToDelta(diffs))12}13import (14func main() {15	dmp := diffmatchpatch.New()16	diffs := dmp.DiffMain(a, b, false)17	fmt.Println(dmp.DiffToDelta(diffs))18}19import (20func main() {21	dmp := diffmatchpatch.New()22	diffs := dmp.DiffMain(a, b, false)23	fmt.Println(dmp.DiffToDelta(diffs))24}25import (26func main() {27	dmp := diffmatchpatch.New()

Format

Using AI Code Generation

1import (2func main() {3	file1, err := ioutil.ReadFile("file1.txt")4	if err != nil {5		log.Fatal(err)6	}7	file2, err := ioutil.ReadFile("file2.txt")8	if err != nil {9		log.Fatal(err)10	}11	dmp := diffmatchpatch.New()12	diffs := dmp.DiffMain(string(file1), string(file2), false)13	fmt.Println(dmp.DiffPrettyText(diffs))14}

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