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ToCamelCase put underscore in between two numbers #35

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ToCamelCase put underscore in between two numbers #35

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caa7e09
camel and snake case add underscore between numbers
paulvollmer Nov 24, 2021
151905a
fix underscore between digit and character
paulvollmer Nov 30, 2021
3402274
camel_test.go add more test cases
paulvollmer Jun 3, 2025
01c7c25
Update camel.go
paulvollmer Jun 3, 2025
54a1430
Merge pull request #1 from paulvollmer/camelcase-fix
paulvollmer Jun 3, 2025
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17 changes: 15 additions & 2 deletions camel.go
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,10 @@ func toCamelInitCase(s string, initCase bool) string {
n := strings.Builder{}
n.Grow(len(s))
capNext := initCase
for i, v := range []byte(s) {
prevWasNum := false
sBytes := []byte(s)
sLen := len(sBytes)
for i, v := range sBytes {
vIsCap := v >= 'A' && v <= 'Z'
vIsLow := v >= 'a' && v <= 'z'
if capNext {
Expand All @@ -59,16 +62,26 @@ func toCamelInitCase(s string, initCase bool) string {
if vIsCap || vIsLow {
n.WriteByte(v)
capNext = false
} else if vIsNum := v >= '0' && v <= '9'; vIsNum {
prevWasNum = false
} else if isNum(v) {
n.WriteByte(v)
prevWasNum = true
capNext = true
} else {
capNext = v == '_' || v == ' ' || v == '-' || v == '.'
if capNext && prevWasNum && (sLen > i+1 && isNum([]byte(s)[i+1])) {
n.WriteByte('_')
prevWasNum = false
}
}
}
return n.String()
}

func isNum(v byte) bool {
return v >= '0' && v <= '9'
}

// ToCamel converts a string to CamelCase
func ToCamel(s string) string {
return toCamelInitCase(s, true)
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9 changes: 9 additions & 0 deletions camel_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,13 @@ func toCamel(tb testing.TB) {
{"", ""},
{"many_many_words", "ManyManyWords"},
{"AnyKind of_string", "AnyKindOfString"},
{"AnyKind.of_string13_", "AnyKindOfString13"},
{"AnyKind.of_string13__", "AnyKindOfString13"},
{"AnyKind.of_string13-", "AnyKindOfString13"},
{"AnyKind.of_string13--", "AnyKindOfString13"},
{"AnyKind.of_string13 ", "AnyKindOfString13"},
{"AnyKind.of_string13_37", "AnyKindOfString13_37"},
{"AnyKind.of_string13_37 test", "AnyKindOfString13_37Test"},
{"odd-fix", "OddFix"},
{"numbers2And55with000", "Numbers2And55With000"},
{"ID", "Id"},
Expand Down Expand Up @@ -67,6 +74,8 @@ func toLowerCamel(tb testing.TB) {
{"", ""},
{"AnyKind of_string", "anyKindOfString"},
{"AnyKind.of-string", "anyKindOfString"},
{"AnyKind.of_string13_37", "anyKindOfString13_37"},
{"AnyKind.of_string13_37test", "anyKindOfString13_37Test"},
{"ID", "id"},
{"some string", "someString"},
{" some string", "someString"},
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2 changes: 2 additions & 0 deletions snake_test.go
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Expand Up @@ -44,6 +44,8 @@ func toSnake(tb testing.TB) {
{"ManyManyWords", "many_many_words"},
{"manyManyWords", "many_many_words"},
{"AnyKind of_string", "any_kind_of_string"},
{"AnyKind of string13 37", "any_kind_of_string_13_37"},
{"AnyKind of string13 37 test", "any_kind_of_string_13_37_test"},
{"numbers2and55with000", "numbers_2_and_55_with_000"},
{"JSONData", "json_data"},
{"userID", "user_id"},
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