tools/caseconversions.py

Fri, 04 Mar 2022 23:00:06 +0200

author
Teemu Piippo <teemu@hecknology.net>
date
Fri, 04 Mar 2022 23:00:06 +0200
changeset 154
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1 #!/usr/bin/env python
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2 # coding: utf-8
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3
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4 '''
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5 Provides facilities to converting identifier cases.
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6 '''
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7
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8 #
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9 # Copyright 2015 Teemu Piippo
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10 # All rights reserved.
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11 #
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12 # Redistribution and use in source and binary forms, with or without
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13 # modification, are permitted provided that the following conditions
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14 # are met:
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15 #
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16 # 1. Redistributions of source code must retain the above copyright
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17 # notice, this list of conditions and the following disclaimer.
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18 # 2. Redistributions in binary form must reproduce the above copyright
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19 # notice, this list of conditions and the following disclaimer in the
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20 # documentation and/or other materials provided with the distribution.
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21 # 3. Neither the name of the copyright holder nor the names of its
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22 # contributors may be used to endorse or promote products derived from
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23 # this software without specific prior written permission.
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24 #
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25 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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26 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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27 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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28 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
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29 # OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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30 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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31 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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32 # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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33 # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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34 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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35 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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36 #
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37
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38 import string
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39 import re
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40
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41 def to_one_case (name, tolower):
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42 '''
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43 Convers name to either all uppercase or all lowercase (depending on the truth value of tolower), using underscores
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44 as delimiters.
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45 '''
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46 result = ""
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47 targetSet = (string.ascii_lowercase if tolower else string.ascii_uppercase) + string.digits
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48 inverseSet = (string.ascii_uppercase if tolower else string.ascii_lowercase)
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49 isUnderscorable = lambda ch: ch in string.ascii_uppercase \
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50 or ch in string.whitespace or ch in string.punctuation
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51 previousWasUnderscorable = isUnderscorable (name[0])
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52
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53 for ch in name:
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54 if isUnderscorable (ch) and result != "" and not previousWasUnderscorable:
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55 result += "_"
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56
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57 if ch in inverseSet:
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58 result += (ch.lower() if tolower else ch.upper())
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59 elif ch in targetSet:
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60 result += ch
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61 previousWasUnderscorable = isUnderscorable (ch)
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62
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63 return result
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64
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65 def to_camel_case (name, java = False):
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66 '''
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67 Converts name to camelcase. If java is False, the first letter will be lowercase, otherwise it will be uppercase.
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68 '''
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69 result = ""
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70 wantUpperCase = False
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71
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72 # If it's all uppercase, make it all lowercase so that this algorithm can digest it
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73 if name == name.upper():
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74 name = name.lower()
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75
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76 for ch in name:
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77 if ch == '_':
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78 wantUpperCase = True
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79 continue
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80
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81 if wantUpperCase:
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82 if ch in string.ascii_lowercase:
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83 ch = ch.upper()
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84 wantUpperCase = False
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85
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86 result += ch
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87
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88 if java:
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89 match = re.match (r'^([A-Z]+)([A-Z].+)$', result)
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90 if match:
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91 result = match.group (1).lower() + match.group (2)
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92 else:
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93 result = result[0].lower() + result[1:]
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94 else:
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95 result = result[0].upper() + result[1:]
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96 return result
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97
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98 case_styles = {
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99 'lower': lambda name: to_one_case (name, tolower=True),
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100 'upper': lambda name: to_one_case (name, tolower=False),
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101 'camel': lambda name: to_camel_case (name, java=False),
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102 'java': lambda name: to_camel_case (name, java=True),
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103 }
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104
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105 def convert_case (name, style):
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106 '''
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107 Converts name to the given style. Style may be one of:
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108 - 'lower': 'foo_barBaz' -> 'foo_bar_baz'
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109 - 'upper': 'foo_barBaz' -> 'FOO_BAR_BAZ'
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110 - 'camel': 'foo_barBaz' -> 'FooBarBaz'
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111 - 'java': 'foo_barBaz' -> 'fooBarBaz'
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112 '''
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113 try:
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114 stylefunc = case_styles[style]
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115 except KeyError:
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116 validstyles = ', '.join (sorted (case_styles.keys()))
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117 raise ValueError ('Unknown style "%s", should be one of: %s' % (style, validstyles))
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118 else:
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119 return stylefunc (name)

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