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language: go
go:
- 1.6
- 1.7
- 1.8
- tip
script:
- go test -v
notifications:
webhooks:
urls:
- https://webhooks.gitter.im/e/06e3328629952dabe3e0
on_success: change # options: [always|never|change] default: always
on_failure: always # options: [always|never|change] default: always
on_start: never # options: [always|never|change] default: always

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# 1.0.1 (2017-05-31)
## Fixed
- #21: Fix generation of alphanumeric strings (thanks @dbarranco)
# 1.0.0 (2014-04-30)
- Initial release.

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GoUtils
===========
[![Stability: Maintenance](https://masterminds.github.io/stability/maintenance.svg)](https://masterminds.github.io/stability/maintenance.html)
[![GoDoc](https://godoc.org/github.com/Masterminds/goutils?status.png)](https://godoc.org/github.com/Masterminds/goutils) [![Build Status](https://travis-ci.org/Masterminds/goutils.svg?branch=master)](https://travis-ci.org/Masterminds/goutils) [![Build status](https://ci.appveyor.com/api/projects/status/sc2b1ew0m7f0aiju?svg=true)](https://ci.appveyor.com/project/mattfarina/goutils)
GoUtils provides users with utility functions to manipulate strings in various ways. It is a Go implementation of some
string manipulation libraries of Java Apache Commons. GoUtils includes the following Java Apache Commons classes:
* WordUtils
* RandomStringUtils
* StringUtils (partial implementation)
## Installation
If you have Go set up on your system, from the GOPATH directory within the command line/terminal, enter this:
go get github.com/Masterminds/goutils
If you do not have Go set up on your system, please follow the [Go installation directions from the documenation](http://golang.org/doc/install), and then follow the instructions above to install GoUtils.
## Documentation
GoUtils doc is available here: [![GoDoc](https://godoc.org/github.com/Masterminds/goutils?status.png)](https://godoc.org/github.com/Masterminds/goutils)
## Usage
The code snippets below show examples of how to use GoUtils. Some functions return errors while others do not. The first instance below, which does not return an error, is the `Initials` function (located within the `wordutils.go` file).
package main
import (
"fmt"
"github.com/Masterminds/goutils"
)
func main() {
// EXAMPLE 1: A goutils function which returns no errors
fmt.Println (goutils.Initials("John Doe Foo")) // Prints out "JDF"
}
Some functions return errors mainly due to illegal arguements used as parameters. The code example below illustrates how to deal with function that returns an error. In this instance, the function is the `Random` function (located within the `randomstringutils.go` file).
package main
import (
"fmt"
"github.com/Masterminds/goutils"
)
func main() {
// EXAMPLE 2: A goutils function which returns an error
rand1, err1 := goutils.Random (-1, 0, 0, true, true)
if err1 != nil {
fmt.Println(err1) // Prints out error message because -1 was entered as the first parameter in goutils.Random(...)
} else {
fmt.Println(rand1)
}
}
## License
GoUtils is licensed under the Apache License, Version 2.0. Please check the LICENSE.txt file or visit http://www.apache.org/licenses/LICENSE-2.0 for a copy of the license.
## Issue Reporting
Make suggestions or report issues using the Git issue tracker: https://github.com/Masterminds/goutils/issues
## Website
* [GoUtils webpage](http://Masterminds.github.io/goutils/)

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version: build-{build}.{branch}
clone_folder: C:\gopath\src\github.com\Masterminds\goutils
shallow_clone: true
environment:
GOPATH: C:\gopath
platform:
- x64
build: off
install:
- go version
- go env
test_script:
- go test -v
deploy: off

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/*
Copyright 2014 Alexander Okoli
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package goutils
import (
"crypto/rand"
"fmt"
"math"
"math/big"
"regexp"
"unicode"
)
/*
CryptoRandomNonAlphaNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of all characters (ASCII/Unicode values between 0 to 2,147,483,647 (math.MaxInt32)).
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomNonAlphaNumeric(count int) (string, error) {
return CryptoRandomAlphaNumericCustom(count, false, false)
}
/*
CryptoRandomAscii creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of characters whose ASCII value is between 32 and 126 (inclusive).
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomAscii(count int) (string, error) {
return CryptoRandom(count, 32, 127, false, false)
}
/*
CryptoRandomNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of numeric characters.
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomNumeric(count int) (string, error) {
return CryptoRandom(count, 0, 0, false, true)
}
/*
CryptoRandomAlphabetic creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters as indicated by the arguments.
Parameters:
count - the length of random string to create
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomAlphabetic(count int) (string, error) {
return CryptoRandom(count, 0, 0, true, false)
}
/*
CryptoRandomAlphaNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters.
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomAlphaNumeric(count int) (string, error) {
if count == 0 {
return "", nil
}
RandomString, err := CryptoRandom(count, 0, 0, true, true)
if err != nil {
return "", fmt.Errorf("Error: %s", err)
}
match, err := regexp.MatchString("([0-9]+)", RandomString)
if err != nil {
panic(err)
}
if !match {
//Get the position between 0 and the length of the string-1 to insert a random number
position := getCryptoRandomInt(count)
//Insert a random number between [0-9] in the position
RandomString = RandomString[:position] + string('0' + getCryptoRandomInt(10)) + RandomString[position + 1:]
return RandomString, err
}
return RandomString, err
}
/*
CryptoRandomAlphaNumericCustom creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters as indicated by the arguments.
Parameters:
count - the length of random string to create
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, CryptoRandom(...)
*/
func CryptoRandomAlphaNumericCustom(count int, letters bool, numbers bool) (string, error) {
return CryptoRandom(count, 0, 0, letters, numbers)
}
/*
CryptoRandom creates a random string based on a variety of options, using using golang's crypto/rand source of randomness.
If the parameters start and end are both 0, start and end are set to ' ' and 'z', the ASCII printable characters, will be used,
unless letters and numbers are both false, in which case, start and end are set to 0 and math.MaxInt32, respectively.
If chars is not nil, characters stored in chars that are between start and end are chosen.
Parameters:
count - the length of random string to create
start - the position in set of chars (ASCII/Unicode int) to start at
end - the position in set of chars (ASCII/Unicode int) to end before
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
chars - the set of chars to choose randoms from. If nil, then it will use the set of all chars.
Returns:
string - the random string
error - an error stemming from invalid parameters: if count < 0; or the provided chars array is empty; or end <= start; or end > len(chars)
*/
func CryptoRandom(count int, start int, end int, letters bool, numbers bool, chars ...rune) (string, error) {
if count == 0 {
return "", nil
} else if count < 0 {
err := fmt.Errorf("randomstringutils illegal argument: Requested random string length %v is less than 0.", count) // equiv to err := errors.New("...")
return "", err
}
if chars != nil && len(chars) == 0 {
err := fmt.Errorf("randomstringutils illegal argument: The chars array must not be empty")
return "", err
}
if start == 0 && end == 0 {
if chars != nil {
end = len(chars)
} else {
if !letters && !numbers {
end = math.MaxInt32
} else {
end = 'z' + 1
start = ' '
}
}
} else {
if end <= start {
err := fmt.Errorf("randomstringutils illegal argument: Parameter end (%v) must be greater than start (%v)", end, start)
return "", err
}
if chars != nil && end > len(chars) {
err := fmt.Errorf("randomstringutils illegal argument: Parameter end (%v) cannot be greater than len(chars) (%v)", end, len(chars))
return "", err
}
}
buffer := make([]rune, count)
gap := end - start
// high-surrogates range, (\uD800-\uDBFF) = 55296 - 56319
// low-surrogates range, (\uDC00-\uDFFF) = 56320 - 57343
for count != 0 {
count--
var ch rune
if chars == nil {
ch = rune(getCryptoRandomInt(gap) + int64(start))
} else {
ch = chars[getCryptoRandomInt(gap) + int64(start)]
}
if letters && unicode.IsLetter(ch) || numbers && unicode.IsDigit(ch) || !letters && !numbers {
if ch >= 56320 && ch <= 57343 { // low surrogate range
if count == 0 {
count++
} else {
// Insert low surrogate
buffer[count] = ch
count--
// Insert high surrogate
buffer[count] = rune(55296 + getCryptoRandomInt(128))
}
} else if ch >= 55296 && ch <= 56191 { // High surrogates range (Partial)
if count == 0 {
count++
} else {
// Insert low surrogate
buffer[count] = rune(56320 + getCryptoRandomInt(128))
count--
// Insert high surrogate
buffer[count] = ch
}
} else if ch >= 56192 && ch <= 56319 {
// private high surrogate, skip it
count++
} else {
// not one of the surrogates*
buffer[count] = ch
}
} else {
count++
}
}
return string(buffer), nil
}
func getCryptoRandomInt(count int) int64 {
nBig, err := rand.Int(rand.Reader, big.NewInt(int64(count)))
if err != nil {
panic(err)
}
return nBig.Int64()
}

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/*
Copyright 2014 Alexander Okoli
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package goutils
import (
"fmt"
"math"
"math/rand"
"regexp"
"time"
"unicode"
)
// RANDOM provides the time-based seed used to generate random numbers
var RANDOM = rand.New(rand.NewSource(time.Now().UnixNano()))
/*
RandomNonAlphaNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of all characters (ASCII/Unicode values between 0 to 2,147,483,647 (math.MaxInt32)).
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomNonAlphaNumeric(count int) (string, error) {
return RandomAlphaNumericCustom(count, false, false)
}
/*
RandomAscii creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of characters whose ASCII value is between 32 and 126 (inclusive).
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomAscii(count int) (string, error) {
return Random(count, 32, 127, false, false)
}
/*
RandomNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of numeric characters.
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomNumeric(count int) (string, error) {
return Random(count, 0, 0, false, true)
}
/*
RandomAlphabetic creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters as indicated by the arguments.
Parameters:
count - the length of random string to create
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomAlphabetic(count int) (string, error) {
return Random(count, 0, 0, true, false)
}
/*
RandomAlphaNumeric creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters.
Parameter:
count - the length of random string to create
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomAlphaNumeric(count int) (string, error) {
RandomString, err := Random(count, 0, 0, true, true)
if err != nil {
return "", fmt.Errorf("Error: %s", err)
}
match, err := regexp.MatchString("([0-9]+)", RandomString)
if err != nil {
panic(err)
}
if !match {
//Get the position between 0 and the length of the string-1 to insert a random number
position := rand.Intn(count)
//Insert a random number between [0-9] in the position
RandomString = RandomString[:position] + string('0'+rand.Intn(10)) + RandomString[position+1:]
return RandomString, err
}
return RandomString, err
}
/*
RandomAlphaNumericCustom creates a random string whose length is the number of characters specified.
Characters will be chosen from the set of alpha-numeric characters as indicated by the arguments.
Parameters:
count - the length of random string to create
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func RandomAlphaNumericCustom(count int, letters bool, numbers bool) (string, error) {
return Random(count, 0, 0, letters, numbers)
}
/*
Random creates a random string based on a variety of options, using default source of randomness.
This method has exactly the same semantics as RandomSeed(int, int, int, bool, bool, []char, *rand.Rand), but
instead of using an externally supplied source of randomness, it uses the internal *rand.Rand instance.
Parameters:
count - the length of random string to create
start - the position in set of chars (ASCII/Unicode int) to start at
end - the position in set of chars (ASCII/Unicode int) to end before
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
chars - the set of chars to choose randoms from. If nil, then it will use the set of all chars.
Returns:
string - the random string
error - an error stemming from an invalid parameter within underlying function, RandomSeed(...)
*/
func Random(count int, start int, end int, letters bool, numbers bool, chars ...rune) (string, error) {
return RandomSeed(count, start, end, letters, numbers, chars, RANDOM)
}
/*
RandomSeed creates a random string based on a variety of options, using supplied source of randomness.
If the parameters start and end are both 0, start and end are set to ' ' and 'z', the ASCII printable characters, will be used,
unless letters and numbers are both false, in which case, start and end are set to 0 and math.MaxInt32, respectively.
If chars is not nil, characters stored in chars that are between start and end are chosen.
This method accepts a user-supplied *rand.Rand instance to use as a source of randomness. By seeding a single *rand.Rand instance
with a fixed seed and using it for each call, the same random sequence of strings can be generated repeatedly and predictably.
Parameters:
count - the length of random string to create
start - the position in set of chars (ASCII/Unicode decimals) to start at
end - the position in set of chars (ASCII/Unicode decimals) to end before
letters - if true, generated string may include alphabetic characters
numbers - if true, generated string may include numeric characters
chars - the set of chars to choose randoms from. If nil, then it will use the set of all chars.
random - a source of randomness.
Returns:
string - the random string
error - an error stemming from invalid parameters: if count < 0; or the provided chars array is empty; or end <= start; or end > len(chars)
*/
func RandomSeed(count int, start int, end int, letters bool, numbers bool, chars []rune, random *rand.Rand) (string, error) {
if count == 0 {
return "", nil
} else if count < 0 {
err := fmt.Errorf("randomstringutils illegal argument: Requested random string length %v is less than 0.", count) // equiv to err := errors.New("...")
return "", err
}
if chars != nil && len(chars) == 0 {
err := fmt.Errorf("randomstringutils illegal argument: The chars array must not be empty")
return "", err
}
if start == 0 && end == 0 {
if chars != nil {
end = len(chars)
} else {
if !letters && !numbers {
end = math.MaxInt32
} else {
end = 'z' + 1
start = ' '
}
}
} else {
if end <= start {
err := fmt.Errorf("randomstringutils illegal argument: Parameter end (%v) must be greater than start (%v)", end, start)
return "", err
}
if chars != nil && end > len(chars) {
err := fmt.Errorf("randomstringutils illegal argument: Parameter end (%v) cannot be greater than len(chars) (%v)", end, len(chars))
return "", err
}
}
buffer := make([]rune, count)
gap := end - start
// high-surrogates range, (\uD800-\uDBFF) = 55296 - 56319
// low-surrogates range, (\uDC00-\uDFFF) = 56320 - 57343
for count != 0 {
count--
var ch rune
if chars == nil {
ch = rune(random.Intn(gap) + start)
} else {
ch = chars[random.Intn(gap)+start]
}
if letters && unicode.IsLetter(ch) || numbers && unicode.IsDigit(ch) || !letters && !numbers {
if ch >= 56320 && ch <= 57343 { // low surrogate range
if count == 0 {
count++
} else {
// Insert low surrogate
buffer[count] = ch
count--
// Insert high surrogate
buffer[count] = rune(55296 + random.Intn(128))
}
} else if ch >= 55296 && ch <= 56191 { // High surrogates range (Partial)
if count == 0 {
count++
} else {
// Insert low surrogate
buffer[count] = rune(56320 + random.Intn(128))
count--
// Insert high surrogate
buffer[count] = ch
}
} else if ch >= 56192 && ch <= 56319 {
// private high surrogate, skip it
count++
} else {
// not one of the surrogates*
buffer[count] = ch
}
} else {
count++
}
}
return string(buffer), nil
}

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/*
Copyright 2014 Alexander Okoli
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package goutils
import (
"bytes"
"fmt"
"strings"
"unicode"
)
// Typically returned by functions where a searched item cannot be found
const INDEX_NOT_FOUND = -1
/*
Abbreviate abbreviates a string using ellipses. This will turn the string "Now is the time for all good men" into "Now is the time for..."
Specifically, the algorithm is as follows:
- If str is less than maxWidth characters long, return it.
- Else abbreviate it to (str[0:maxWidth - 3] + "...").
- If maxWidth is less than 4, return an illegal argument error.
- In no case will it return a string of length greater than maxWidth.
Parameters:
str - the string to check
maxWidth - maximum length of result string, must be at least 4
Returns:
string - abbreviated string
error - if the width is too small
*/
func Abbreviate(str string, maxWidth int) (string, error) {
return AbbreviateFull(str, 0, maxWidth)
}
/*
AbbreviateFull abbreviates a string using ellipses. This will turn the string "Now is the time for all good men" into "...is the time for..."
This function works like Abbreviate(string, int), but allows you to specify a "left edge" offset. Note that this left edge is not
necessarily going to be the leftmost character in the result, or the first character following the ellipses, but it will appear
somewhere in the result.
In no case will it return a string of length greater than maxWidth.
Parameters:
str - the string to check
offset - left edge of source string
maxWidth - maximum length of result string, must be at least 4
Returns:
string - abbreviated string
error - if the width is too small
*/
func AbbreviateFull(str string, offset int, maxWidth int) (string, error) {
if str == "" {
return "", nil
}
if maxWidth < 4 {
err := fmt.Errorf("stringutils illegal argument: Minimum abbreviation width is 4")
return "", err
}
if len(str) <= maxWidth {
return str, nil
}
if offset > len(str) {
offset = len(str)
}
if len(str)-offset < (maxWidth - 3) { // 15 - 5 < 10 - 3 = 10 < 7
offset = len(str) - (maxWidth - 3)
}
abrevMarker := "..."
if offset <= 4 {
return str[0:maxWidth-3] + abrevMarker, nil // str.substring(0, maxWidth - 3) + abrevMarker;
}
if maxWidth < 7 {
err := fmt.Errorf("stringutils illegal argument: Minimum abbreviation width with offset is 7")
return "", err
}
if (offset + maxWidth - 3) < len(str) { // 5 + (10-3) < 15 = 12 < 15
abrevStr, _ := Abbreviate(str[offset:len(str)], (maxWidth - 3))
return abrevMarker + abrevStr, nil // abrevMarker + abbreviate(str.substring(offset), maxWidth - 3);
}
return abrevMarker + str[(len(str)-(maxWidth-3)):len(str)], nil // abrevMarker + str.substring(str.length() - (maxWidth - 3));
}
/*
DeleteWhiteSpace deletes all whitespaces from a string as defined by unicode.IsSpace(rune).
It returns the string without whitespaces.
Parameter:
str - the string to delete whitespace from, may be nil
Returns:
the string without whitespaces
*/
func DeleteWhiteSpace(str string) string {
if str == "" {
return str
}
sz := len(str)
var chs bytes.Buffer
count := 0
for i := 0; i < sz; i++ {
ch := rune(str[i])
if !unicode.IsSpace(ch) {
chs.WriteRune(ch)
count++
}
}
if count == sz {
return str
}
return chs.String()
}
/*
IndexOfDifference compares two strings, and returns the index at which the strings begin to differ.
Parameters:
str1 - the first string
str2 - the second string
Returns:
the index where str1 and str2 begin to differ; -1 if they are equal
*/
func IndexOfDifference(str1 string, str2 string) int {
if str1 == str2 {
return INDEX_NOT_FOUND
}
if IsEmpty(str1) || IsEmpty(str2) {
return 0
}
var i int
for i = 0; i < len(str1) && i < len(str2); i++ {
if rune(str1[i]) != rune(str2[i]) {
break
}
}
if i < len(str2) || i < len(str1) {
return i
}
return INDEX_NOT_FOUND
}
/*
IsBlank checks if a string is whitespace or empty (""). Observe the following behavior:
goutils.IsBlank("") = true
goutils.IsBlank(" ") = true
goutils.IsBlank("bob") = false
goutils.IsBlank(" bob ") = false
Parameter:
str - the string to check
Returns:
true - if the string is whitespace or empty ("")
*/
func IsBlank(str string) bool {
strLen := len(str)
if str == "" || strLen == 0 {
return true
}
for i := 0; i < strLen; i++ {
if unicode.IsSpace(rune(str[i])) == false {
return false
}
}
return true
}
/*
IndexOf returns the index of the first instance of sub in str, with the search beginning from the
index start point specified. -1 is returned if sub is not present in str.
An empty string ("") will return -1 (INDEX_NOT_FOUND). A negative start position is treated as zero.
A start position greater than the string length returns -1.
Parameters:
str - the string to check
sub - the substring to find
start - the start position; negative treated as zero
Returns:
the first index where the sub string was found (always >= start)
*/
func IndexOf(str string, sub string, start int) int {
if start < 0 {
start = 0
}
if len(str) < start {
return INDEX_NOT_FOUND
}
if IsEmpty(str) || IsEmpty(sub) {
return INDEX_NOT_FOUND
}
partialIndex := strings.Index(str[start:len(str)], sub)
if partialIndex == -1 {
return INDEX_NOT_FOUND
}
return partialIndex + start
}
// IsEmpty checks if a string is empty (""). Returns true if empty, and false otherwise.
func IsEmpty(str string) bool {
return len(str) == 0
}

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/*
Copyright 2014 Alexander Okoli
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
Package goutils provides utility functions to manipulate strings in various ways.
The code snippets below show examples of how to use goutils. Some functions return
errors while others do not, so usage would vary as a result.
Example:
package main
import (
"fmt"
"github.com/aokoli/goutils"
)
func main() {
// EXAMPLE 1: A goutils function which returns no errors
fmt.Println (goutils.Initials("John Doe Foo")) // Prints out "JDF"
// EXAMPLE 2: A goutils function which returns an error
rand1, err1 := goutils.Random (-1, 0, 0, true, true)
if err1 != nil {
fmt.Println(err1) // Prints out error message because -1 was entered as the first parameter in goutils.Random(...)
} else {
fmt.Println(rand1)
}
}
*/
package goutils
import (
"bytes"
"strings"
"unicode"
)
// VERSION indicates the current version of goutils
const VERSION = "1.0.0"
/*
Wrap wraps a single line of text, identifying words by ' '.
New lines will be separated by '\n'. Very long words, such as URLs will not be wrapped.
Leading spaces on a new line are stripped. Trailing spaces are not stripped.
Parameters:
str - the string to be word wrapped
wrapLength - the column (a column can fit only one character) to wrap the words at, less than 1 is treated as 1
Returns:
a line with newlines inserted
*/
func Wrap(str string, wrapLength int) string {
return WrapCustom(str, wrapLength, "", false)
}
/*
WrapCustom wraps a single line of text, identifying words by ' '.
Leading spaces on a new line are stripped. Trailing spaces are not stripped.
Parameters:
str - the string to be word wrapped
wrapLength - the column number (a column can fit only one character) to wrap the words at, less than 1 is treated as 1
newLineStr - the string to insert for a new line, "" uses '\n'
wrapLongWords - true if long words (such as URLs) should be wrapped
Returns:
a line with newlines inserted
*/
func WrapCustom(str string, wrapLength int, newLineStr string, wrapLongWords bool) string {
if str == "" {
return ""
}
if newLineStr == "" {
newLineStr = "\n" // TODO Assumes "\n" is seperator. Explore SystemUtils.LINE_SEPARATOR from Apache Commons
}
if wrapLength < 1 {
wrapLength = 1
}
inputLineLength := len(str)
offset := 0
var wrappedLine bytes.Buffer
for inputLineLength-offset > wrapLength {
if rune(str[offset]) == ' ' {
offset++
continue
}
end := wrapLength + offset + 1
spaceToWrapAt := strings.LastIndex(str[offset:end], " ") + offset
if spaceToWrapAt >= offset {
// normal word (not longer than wrapLength)
wrappedLine.WriteString(str[offset:spaceToWrapAt])
wrappedLine.WriteString(newLineStr)
offset = spaceToWrapAt + 1
} else {
// long word or URL
if wrapLongWords {
end := wrapLength + offset
// long words are wrapped one line at a time
wrappedLine.WriteString(str[offset:end])
wrappedLine.WriteString(newLineStr)
offset += wrapLength
} else {
// long words aren't wrapped, just extended beyond limit
end := wrapLength + offset
index := strings.IndexRune(str[end:len(str)], ' ')
if index == -1 {
wrappedLine.WriteString(str[offset:len(str)])
offset = inputLineLength
} else {
spaceToWrapAt = index + end
wrappedLine.WriteString(str[offset:spaceToWrapAt])
wrappedLine.WriteString(newLineStr)
offset = spaceToWrapAt + 1
}
}
}
}
wrappedLine.WriteString(str[offset:len(str)])
return wrappedLine.String()
}
/*
Capitalize capitalizes all the delimiter separated words in a string. Only the first letter of each word is changed.
To convert the rest of each word to lowercase at the same time, use CapitalizeFully(str string, delimiters ...rune).
The delimiters represent a set of characters understood to separate words. The first string character
and the first non-delimiter character after a delimiter will be capitalized. A "" input string returns "".
Capitalization uses the Unicode title case, normally equivalent to upper case.
Parameters:
str - the string to capitalize
delimiters - set of characters to determine capitalization, exclusion of this parameter means whitespace would be delimeter
Returns:
capitalized string
*/
func Capitalize(str string, delimiters ...rune) string {
var delimLen int
if delimiters == nil {
delimLen = -1
} else {
delimLen = len(delimiters)
}
if str == "" || delimLen == 0 {
return str
}
buffer := []rune(str)
capitalizeNext := true
for i := 0; i < len(buffer); i++ {
ch := buffer[i]
if isDelimiter(ch, delimiters...) {
capitalizeNext = true
} else if capitalizeNext {
buffer[i] = unicode.ToTitle(ch)
capitalizeNext = false
}
}
return string(buffer)
}
/*
CapitalizeFully converts all the delimiter separated words in a string into capitalized words, that is each word is made up of a
titlecase character and then a series of lowercase characters. The delimiters represent a set of characters understood
to separate words. The first string character and the first non-delimiter character after a delimiter will be capitalized.
Capitalization uses the Unicode title case, normally equivalent to upper case.
Parameters:
str - the string to capitalize fully
delimiters - set of characters to determine capitalization, exclusion of this parameter means whitespace would be delimeter
Returns:
capitalized string
*/
func CapitalizeFully(str string, delimiters ...rune) string {
var delimLen int
if delimiters == nil {
delimLen = -1
} else {
delimLen = len(delimiters)
}
if str == "" || delimLen == 0 {
return str
}
str = strings.ToLower(str)
return Capitalize(str, delimiters...)
}
/*
Uncapitalize uncapitalizes all the whitespace separated words in a string. Only the first letter of each word is changed.
The delimiters represent a set of characters understood to separate words. The first string character and the first non-delimiter
character after a delimiter will be uncapitalized. Whitespace is defined by unicode.IsSpace(char).
Parameters:
str - the string to uncapitalize fully
delimiters - set of characters to determine capitalization, exclusion of this parameter means whitespace would be delimeter
Returns:
uncapitalized string
*/
func Uncapitalize(str string, delimiters ...rune) string {
var delimLen int
if delimiters == nil {
delimLen = -1
} else {
delimLen = len(delimiters)
}
if str == "" || delimLen == 0 {
return str
}
buffer := []rune(str)
uncapitalizeNext := true // TODO Always makes capitalize/un apply to first char.
for i := 0; i < len(buffer); i++ {
ch := buffer[i]
if isDelimiter(ch, delimiters...) {
uncapitalizeNext = true
} else if uncapitalizeNext {
buffer[i] = unicode.ToLower(ch)
uncapitalizeNext = false
}
}
return string(buffer)
}
/*
SwapCase swaps the case of a string using a word based algorithm.
Conversion algorithm:
Upper case character converts to Lower case
Title case character converts to Lower case
Lower case character after Whitespace or at start converts to Title case
Other Lower case character converts to Upper case
Whitespace is defined by unicode.IsSpace(char).
Parameters:
str - the string to swap case
Returns:
the changed string
*/
func SwapCase(str string) string {
if str == "" {
return str
}
buffer := []rune(str)
whitespace := true
for i := 0; i < len(buffer); i++ {
ch := buffer[i]
if unicode.IsUpper(ch) {
buffer[i] = unicode.ToLower(ch)
whitespace = false
} else if unicode.IsTitle(ch) {
buffer[i] = unicode.ToLower(ch)
whitespace = false
} else if unicode.IsLower(ch) {
if whitespace {
buffer[i] = unicode.ToTitle(ch)
whitespace = false
} else {
buffer[i] = unicode.ToUpper(ch)
}
} else {
whitespace = unicode.IsSpace(ch)
}
}
return string(buffer)
}
/*
Initials extracts the initial letters from each word in the string. The first letter of the string and all first
letters after the defined delimiters are returned as a new string. Their case is not changed. If the delimiters
parameter is excluded, then Whitespace is used. Whitespace is defined by unicode.IsSpacea(char). An empty delimiter array returns an empty string.
Parameters:
str - the string to get initials from
delimiters - set of characters to determine words, exclusion of this parameter means whitespace would be delimeter
Returns:
string of initial letters
*/
func Initials(str string, delimiters ...rune) string {
if str == "" {
return str
}
if delimiters != nil && len(delimiters) == 0 {
return ""
}
strLen := len(str)
var buf bytes.Buffer
lastWasGap := true
for i := 0; i < strLen; i++ {
ch := rune(str[i])
if isDelimiter(ch, delimiters...) {
lastWasGap = true
} else if lastWasGap {
buf.WriteRune(ch)
lastWasGap = false
}
}
return buf.String()
}
// private function (lower case func name)
func isDelimiter(ch rune, delimiters ...rune) bool {
if delimiters == nil {
return unicode.IsSpace(ch)
}
for _, delimiter := range delimiters {
if ch == delimiter {
return true
}
}
return false
}