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|
package toolbox
import (
"bufio"
"io"
"unicode"
)
//IsASCIIText return true if supplied string does not have binary data
func IsASCIIText(candidate string) bool {
for _, r := range candidate {
if r == '\n' || r == '\r' || r == '\t' {
continue
}
if r > unicode.MaxASCII || !unicode.IsPrint(r) || r == '`' {
return false
}
}
return true
}
//IsPrintText return true if all candidate characters are printable (unicode.IsPrintText)
func IsPrintText(candidate string) bool {
for _, r := range candidate {
if !unicode.IsPrint(r) {
if r == '\n' || r == '\r' || r == '\t' || r == '`' {
continue
}
return false
}
}
return true
}
//TerminatedSplitN split supplied text into n fragmentCount, each terminated with supplied terminator
func TerminatedSplitN(text string, fragmentCount int, terminator string) []string {
var result = make([]string, 0)
if fragmentCount == 0 {
fragmentCount = 1
}
fragmentSize := len(text) / fragmentCount
lowerBound := 0
for i := fragmentSize - 1; i < len(text); i++ {
isLast := i+1 == len(text)
isAtLeastOfFragmentSize := i-lowerBound >= fragmentSize
isNewLine := string(text[i:i+len(terminator)]) == terminator
if (isAtLeastOfFragmentSize && isNewLine) || isLast {
result = append(result, string(text[lowerBound:i+1]))
lowerBound = i + 1
}
}
return result
}
//SplitTextStream divides reader supplied text by number of specified line
func SplitTextStream(reader io.Reader, writerProvider func() io.WriteCloser, elementCount int) error {
scanner := bufio.NewScanner(reader)
var writer io.WriteCloser
counter := 0
var err error
if elementCount == 0 {
elementCount = 1
}
for scanner.Scan() {
if writer == nil {
writer = writerProvider()
}
data := scanner.Bytes()
if err = scanner.Err(); err != nil {
return err
}
if counter > 0 {
if _, err = writer.Write([]byte{'\n'}); err != nil {
return err
}
}
if _, err = writer.Write(data); err != nil {
return err
}
counter++
if counter == elementCount {
if err := writer.Close(); err != nil {
return err
}
counter = 0
writer = nil
}
}
if writer != nil {
return writer.Close()
}
return nil
}
const (
CaseUpper = iota
CaseLower
CaseUpperCamel
CaseLowerCamel
CaseUpperUnderscore
CaseLowerUnderscore
)
//ToCaseFormat format text, from, to are const: CaseLower, CaseUpperCamel, CaseLowerCamel, CaseUpperUnderscore, CaseLowerUnderscore,
func ToCaseFormat(text string, from, to int) string {
toUpper := false
toLower := false
toCamel := false
toUnserscore := false
fromCamel := false
fromUnserscore := false
switch to {
case CaseUpper, CaseUpperUnderscore:
toUpper = true
case CaseLower, CaseLowerUnderscore:
toLower = true
case CaseUpperCamel, CaseLowerCamel:
toCamel = true
}
switch to {
case CaseUpperUnderscore, CaseLowerUnderscore:
toUnserscore = true
}
switch from {
case CaseUpperCamel, CaseLowerCamel:
fromCamel = true
case CaseUpperUnderscore, CaseLowerUnderscore:
fromUnserscore = true
}
underscore := rune('_')
var result = make([]rune, 0)
makeLower := false
makeUpper := false
hasUnderscore := false
for i, r := range text {
first := i == 0
if toUpper {
makeUpper = true
} else if toLower {
makeLower = true
}
if first {
if to == CaseLowerCamel {
r = unicode.ToLower(r)
} else if to == CaseUpperCamel {
r = unicode.ToUpper(r)
}
} else {
if fromUnserscore {
if toCamel {
if r == underscore {
hasUnderscore = true
continue
}
if hasUnderscore {
makeUpper = true
hasUnderscore = false
} else {
makeLower = true
}
}
}
if unicode.IsUpper(r) && fromCamel {
if toUnserscore {
result = append(result, underscore)
}
}
}
if makeLower {
r = unicode.ToLower(r)
} else if makeUpper {
r = unicode.ToUpper(r)
}
result = append(result, r)
makeUpper = false
makeLower = false
}
return string(result)
}
|
