82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
package diff
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import (
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"fmt"
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"strings"
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)
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// compareStrings compares two strings character by character, optionally ignoring whitespace.
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func compareStrings(str1, str2 string, compareSpace bool) bool {
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if compareSpace {
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return str1 == str2
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}
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var i, j int
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l1 := len(str1)
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l2 := len(str2)
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for i < l1 && j < l2 {
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for i < l1 && isWhitespace(str1[i]) {
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i++
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}
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for j < l2 && isWhitespace(str2[j]) {
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j++
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}
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if i < l1 && j < l2 && str1[i] != str2[j] {
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return false
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}
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if i < l1 {
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i++
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}
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if j < l2 {
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j++
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}
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}
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for i < l1 && isWhitespace(str1[i]) {
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i++
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}
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for j < l2 && isWhitespace(str2[j]) {
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j++
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}
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return i == l1 && j == l2
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}
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func isWhitespace(b byte) bool {
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return b == ' ' ||
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b == '\t' ||
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b == '\n' ||
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b == '\r' ||
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b == '\v' ||
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b == '\f' ||
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b == 0x85 ||
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b == 0xA0
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}
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func formatDiff(oldList []string, newList []string, ops []Op[string]) string {
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var result []string
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i, j := 0, 0
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for _, op := range ops {
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if op.OpType == OpDelete {
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for i < op.OldPos {
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result = append(result, " "+oldList[i])
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i++
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j++
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}
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result = append(result, "- "+fmt.Sprint(op.Elem))
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i++
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} else if op.OpType == OpInsert {
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for j < op.NewPos {
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result = append(result, " "+newList[j])
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i++
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j++
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}
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result = append(result, "+ "+fmt.Sprint(op.Elem))
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j++
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}
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}
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for i < len(oldList) && j < len(newList) {
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result = append(result, " "+oldList[i])
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i++
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j++
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}
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return strings.Join(result, "\n")
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}
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