forked from mirror/enumer
Use go modules
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Álvaro
parent
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commit
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module github.com/alvaroloes/enumer
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go 1.12
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require github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1
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github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1 h1:/I3lTljEEDNYLho3/FUB7iD/oc2cEFgVmbHzV+O0PtU=
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github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1/go.mod h1:eD5JxqMiuNYyFNmyY9rkJ/slN8y59oEu4Ei7F8OoKWQ=
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To the extent possible under law, Pascal S. de Kloe has waived all
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copyright and related or neighboring rights to Colfer. This work is
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published from The Netherlands.
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[](https://godoc.org/github.com/pascaldekloe/name)
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Naming convention library for the Go programming language (golang).
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This is free and unencumbered software released into the
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[public domain](http://creativecommons.org/publicdomain/zero/1.0).
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// Package name implements naming conventions.
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package name
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import "unicode"
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// CamelCase returns the medial capitals form of word sequence s.
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// The input can be any case or even just a bunch of words.
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// Upper case abbreviations are preserved.
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// Argument upper sets the casing for the first rune.
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func CamelCase(s string, upper bool) string {
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if s == "" {
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return ""
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}
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out := make([]rune, 1, len(s)+5)
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for i, r := range s {
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if i == 0 {
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if upper {
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r = unicode.ToUpper(r)
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}
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out[0] = r
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continue
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}
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if i == 1 {
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if !upper && unicode.Is(unicode.Lower, r) {
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out[0] = unicode.ToLower(out[0])
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}
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upper = false
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}
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switch {
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case unicode.IsLetter(r):
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if upper {
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r = unicode.ToUpper(r)
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}
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fallthrough
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case unicode.IsNumber(r):
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upper = false
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out = append(out, r)
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default:
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upper = true
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}
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}
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return string(out)
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}
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// SnakeCase is an alias for Delimit(s, '_').
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func SnakeCase(s string) string {
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return Delimit(s, '_')
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}
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// DotSeparated is an alias for Delimit(s, '.').
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func DotSeparated(s string) string {
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return Delimit(s, '.')
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}
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// Delimit returns word sequence s delimited with sep.
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// The input can be any case or even just a bunch of words.
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// Upper case abbreviations are preserved. Use strings.ToLower
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// and strings.ToUpper to enforce a letter case.
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func Delimit(s string, sep rune) string {
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out := make([]rune, 0, len(s)+5)
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for _, r := range s {
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switch {
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case unicode.IsUpper(r):
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if last := len(out) - 1; last >= 0 && unicode.IsLower(out[last]) {
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out = append(out, sep)
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}
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case unicode.IsLetter(r):
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if i := len(out) - 1; i >= 0 {
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if last := out[i]; unicode.IsUpper(last) {
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out = out[:i]
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if i > 0 && out[i-1] != sep {
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out = append(out, sep)
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}
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out = append(out, unicode.ToLower(last))
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}
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}
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case !unicode.IsNumber(r):
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if i := len(out); i != 0 && out[i-1] != sep {
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out = append(out, sep)
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}
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continue
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}
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out = append(out, r)
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}
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if len(out) == 0 {
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return ""
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}
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// trim tailing separator
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if i := len(out) - 1; out[i] == sep {
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out = out[:i]
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}
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if len(out) == 1 {
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out[0] = unicode.ToLower(out[0])
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}
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return string(out)
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}
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package name
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import (
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"testing"
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)
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type goldenCase struct {
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snake, lowerCamel, upperCamel string
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}
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var goldenCases = []goldenCase{
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{"", "", ""},
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{"i", "i", "I"},
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{"name", "name", "Name"},
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{"ID", "ID", "ID"},
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{"wi_fi", "wiFi", "WiFi"},
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// single outer abbreviation
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{"vitamin_C", "vitaminC", "VitaminC"},
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{"T_cell", "TCell", "TCell"},
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// double outer abbreviation
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{"master_DB", "masterDB", "MasterDB"},
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{"IO_bounds", "IOBounds", "IOBounds"},
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// tripple outer abbreviation
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{"main_API", "mainAPI", "MainAPI"},
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{"TCP_conn", "TCPConn", "TCPConn"},
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// inner abbreviation
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{"raw_URL_query", "rawURLQuery", "RawURLQuery"},
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// numbers
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{"4x4", "4x4", "4x4"},
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{"no5", "no5", "No5"},
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{"DB2", "DB2", "DB2"},
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{"3M", "3M", "3M"},
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{"7_up", "7Up", "7Up"},
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{"20th", "20th", "20th"},
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}
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func TestSnakeToSnake(t *testing.T) {
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for _, golden := range goldenCases {
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s := golden.snake
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if got := SnakeCase(s); got != s {
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t.Errorf("%q: got %q", s, got)
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}
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}
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}
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func TestLowerCamelToLowerCamel(t *testing.T) {
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for _, golden := range goldenCases {
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s := golden.lowerCamel
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if got := CamelCase(s, false); got != s {
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t.Errorf("%q: got %q", s, got)
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}
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}
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}
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func TestUpperCamelToUpperCamel(t *testing.T) {
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for _, golden := range goldenCases {
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s := golden.upperCamel
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if got := CamelCase(s, true); got != s {
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t.Errorf("%q: got %q", s, got)
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}
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}
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}
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func TestSnakeToLowerCamel(t *testing.T) {
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for _, golden := range goldenCases {
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snake, want := golden.snake, golden.lowerCamel
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if got := CamelCase(snake, false); got != want {
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t.Errorf("%q: got %q, want %q", snake, got, want)
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}
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}
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}
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func TestSnakeToUpperCamel(t *testing.T) {
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for _, golden := range goldenCases {
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snake, want := golden.snake, golden.upperCamel
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if got := CamelCase(snake, true); got != want {
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t.Errorf("%q: got %q, want %q", snake, got, want)
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}
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}
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}
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func TestLowerCamelToSnake(t *testing.T) {
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for _, golden := range goldenCases {
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camel, want := golden.lowerCamel, golden.snake
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if got := SnakeCase(camel); got != want {
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t.Errorf("%q: got %q, want %q", camel, got, want)
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}
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}
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}
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func TestUpperCamelToSnake(t *testing.T) {
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for _, golden := range goldenCases {
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camel, want := golden.upperCamel, golden.snake
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if got := SnakeCase(camel); got != want {
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t.Errorf("%q: got %q, want %q", camel, got, want)
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}
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}
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}
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package name_test
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import (
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"fmt"
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"github.com/pascaldekloe/name"
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)
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func ExampleCamelCase() {
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fmt.Println(name.CamelCase("pascal case", true))
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fmt.Println(name.CamelCase("snake_to_camel AND CamelToCamel?", false))
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// Output:
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// PascalCase
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// snakeToCamelANDCamelToCamel
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}
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func ExampleDelimit() {
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// Garbage to Lisp-case:
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fmt.Println(name.Delimit("* All Hype is aGoodThing (TM)", '-'))
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// Builds a Java property key:
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fmt.Println(name.DotSeparated("WebCrawler#socketTimeout"))
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// Output:
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// all-hype-is-a-good-thing-TM
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// web.crawler.socket.timeout
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}
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