vitess.io/vitess@v0.16.2/go/textutil/strings.go (about)

     1  /*
     2  Copyright 2020 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package textutil
    18  
    19  import (
    20  	"net/url"
    21  	"regexp"
    22  	"strings"
    23  )
    24  
    25  var (
    26  	delimitedListRegexp = regexp.MustCompile(`[ ,;]+`)
    27  )
    28  
    29  // SplitDelimitedList splits a given string by comma, semi-colon or space, and returns non-empty strings
    30  func SplitDelimitedList(s string) (list []string) {
    31  	tokens := delimitedListRegexp.Split(s, -1)
    32  	for _, token := range tokens {
    33  		token = strings.TrimSpace(token)
    34  		if token == "" {
    35  			continue
    36  		}
    37  		list = append(list, token)
    38  	}
    39  	return list
    40  }
    41  
    42  // EscapeJoin acts like strings.Join, except it first escapes elements via net/url
    43  func EscapeJoin(elems []string, sep string) string {
    44  	escapedElems := []string{}
    45  	for i := range elems {
    46  		escapedElems = append(escapedElems, url.QueryEscape(elems[i]))
    47  	}
    48  	return strings.Join(escapedElems, sep)
    49  }
    50  
    51  // SplitUnescape acts like strings.Split, except it then unescapes tokens via net/url
    52  func SplitUnescape(s string, sep string) ([]string, error) {
    53  	if s == "" {
    54  		return nil, nil
    55  	}
    56  	elems := strings.Split(s, sep)
    57  	unescapedElems := []string{}
    58  	for i := range elems {
    59  		d, err := url.QueryUnescape(elems[i])
    60  		if err != nil {
    61  			return unescapedElems, err
    62  		}
    63  		unescapedElems = append(unescapedElems, d)
    64  	}
    65  	return unescapedElems, nil
    66  }
    67  
    68  // SingleWordCamel takes a single word and returns is in Camel case; basically
    69  // just capitalizing the first letter and making sure the rest are lower case.
    70  func SingleWordCamel(w string) string {
    71  	if w == "" {
    72  		return w
    73  	}
    74  	return strings.ToUpper(w[0:1]) + strings.ToLower(w[1:])
    75  }