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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package constructor | ||
|
|
||
| import ( | ||
| "strings" | ||
| "unicode" | ||
| ) | ||
|
|
||
| // https://github.com/golang/lint/blob/206c0f020eba0f7fbcfbc467a5eb808037df2ed6/lint.go#L731 | ||
| var commonInitialisms = map[string]bool{ | ||
| "ACL": true, | ||
| "API": true, | ||
| "ASCII": true, | ||
| "CPU": true, | ||
| "CSS": true, | ||
| "DNS": true, | ||
| "EOF": true, | ||
| "GUID": true, | ||
| "HTML": true, | ||
| "HTTP": true, | ||
| "HTTPS": true, | ||
| "ID": true, | ||
| "IP": true, | ||
| "JSON": true, | ||
| "LHS": true, | ||
| "QPS": true, | ||
| "RAM": true, | ||
| "RHS": true, | ||
| "RPC": true, | ||
| "SLA": true, | ||
| "SMTP": true, | ||
| "SQL": true, | ||
| "SSH": true, | ||
| "TCP": true, | ||
| "TLS": true, | ||
| "TTL": true, | ||
| "UDP": true, | ||
| "UI": true, | ||
| "UID": true, | ||
| "UUID": true, | ||
| "URI": true, | ||
| "URL": true, | ||
| "UTF8": true, | ||
| "VM": true, | ||
| "XML": true, | ||
| "XMPP": true, | ||
| "XSRF": true, | ||
| "XSS": true, | ||
| } | ||
|
|
||
| func toLowerCamel(name string) string { | ||
| // Fast path for simple cases: "_" and all lowercase. | ||
| if name == "_" { | ||
| return name | ||
| } | ||
| allLower := true | ||
| for _, r := range name { | ||
| if !unicode.IsLower(r) { | ||
| allLower = false | ||
| break | ||
| } | ||
| } | ||
| if allLower { | ||
| return name | ||
| } | ||
|
|
||
| // Split camelCase at any lower->upper transition, and split on underscores. | ||
| // Check each word for common initialisms. | ||
| runes := []rune(name) | ||
| w, i := 0, 0 // index of start of word, scan | ||
| for i+1 <= len(runes) { | ||
| eow := false // whether we hit the end of a word | ||
| if i+1 == len(runes) { | ||
| eow = true | ||
| } else if runes[i+1] == '_' { | ||
| // underscore; shift the remainder forward over any run of underscores | ||
| eow = true | ||
| n := 1 | ||
| for i+n+1 < len(runes) && runes[i+n+1] == '_' { | ||
| n++ | ||
| } | ||
|
|
||
| // Leave at most one underscore if the underscore is between two digits | ||
| if i+n+1 < len(runes) && unicode.IsDigit(runes[i]) && unicode.IsDigit(runes[i+n+1]) { | ||
| n-- | ||
| } | ||
|
|
||
| copy(runes[i+1:], runes[i+n+1:]) | ||
| runes = runes[:len(runes)-n] | ||
| } else if unicode.IsLower(runes[i]) && !unicode.IsLower(runes[i+1]) { | ||
| // lower->non-lower | ||
| eow = true | ||
| } | ||
| i++ | ||
| if !eow { | ||
| continue | ||
| } | ||
|
|
||
| // [w,i) is a word. | ||
| word := string(runes[w:i]) | ||
| if u := strings.ToUpper(word); commonInitialisms[u] { | ||
| if w == 0 { | ||
| u = strings.ToLower(u) | ||
| } | ||
| copy(runes[w:], []rune(u)) | ||
| } else if w == 0 { | ||
| copy(runes[w:], []rune(strings.ToLower(word))) | ||
| } | ||
| w = i | ||
| } | ||
| return string(runes) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package constructor | ||
|
|
||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestToLowerCase(t *testing.T) { | ||
| tests := []struct { | ||
| input string | ||
| want string | ||
| }{ | ||
| {input: "", want: ""}, | ||
| {input: "ID", want: "id"}, | ||
| {input: "utf8", want: "utf8"}, | ||
| {input: "Utf8", want: "utf8"}, | ||
| {input: "UTF8", want: "utf8"}, | ||
| {input: "utf8name", want: "utf8name"}, | ||
| {input: "utf8_name", want: "utf8name"}, | ||
| {input: "Name", want: "name"}, | ||
| {input: "name", want: "name"}, | ||
| {input: "NAME", want: "name"}, | ||
| {input: "UserName", want: "userName"}, | ||
| {input: "userName", want: "userName"}, | ||
| {input: "user_Name", want: "userName"}, | ||
| {input: "MoZnIoN", want: "moZnIoN"}, | ||
| } | ||
|
|
||
| for _, test := range tests { | ||
| got := toLowerCamel(test.input) | ||
| if got != test.want { | ||
| t.Errorf("toLowerCamel: want %v, but %v for %v:", test.want, got, test.input) | ||
| } | ||
| } | ||
| } |