Mercurial > hg
annotate mercurial/registrar.py @ 28392:b983a2f04987
registrar: introduce new class for registration to replace funcregistrar
_funcregistrarbase differs from funcregistrar in points below:
- every code paths should use same class derived from
_funcregistrarbase to register functions in a same category
funcregistrar expects (3rd party) extensions to use (a class
derived from) delayregistrar.
- actual extra setup should be executed in another function
For example, marking revset predicate as "safe" is executed in a
class derived from _funcregistrarbase, but putting name of "safe"
predicate into safesymbols is executed in another function for it.
funcregistrar expects derived classes to do so.
New class is named as module private one, because code paths, which
register functions, should use not it directly but one derived from
it.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Tue, 08 Mar 2016 23:04:53 +0900 |
parents | 60bf90eb8bf8 |
children | ac11ba7c2e56 |
rev | line source |
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1 # registrar.py - utilities to register function for specific purpose |
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2 # |
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3 # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 from . import ( |
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11 util, |
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12 ) |
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13 |
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14 class funcregistrar(object): |
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15 """Base of decorator to register a fuction for specific purpose |
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16 |
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17 The least derived class can be defined by overriding 'table' and |
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18 'formatdoc', for example:: |
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19 |
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20 symbols = {} |
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21 class keyword(funcregistrar): |
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22 table = symbols |
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23 formatdoc = ":%s: %s" |
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24 |
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25 @keyword('bar') |
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26 def barfunc(*args, **kwargs): |
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27 '''Explanation of bar keyword .... |
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28 ''' |
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29 pass |
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30 |
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31 In this case: |
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32 |
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33 - 'barfunc' is registered as 'bar' in 'symbols' |
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34 - online help uses ":bar: Explanation of bar keyword" |
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35 """ |
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36 |
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37 def __init__(self, decl): |
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38 """'decl' is a name or more descriptive string of a function |
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39 |
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40 Specification of 'decl' depends on registration purpose. |
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41 """ |
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42 self.decl = decl |
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43 |
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44 table = None |
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45 |
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46 def __call__(self, func): |
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47 """Execute actual registration for specified function |
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48 """ |
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49 name = self.getname() |
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50 |
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51 if func.__doc__ and not util.safehasattr(func, '_origdoc'): |
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52 doc = func.__doc__.strip() |
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53 func._origdoc = doc |
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54 if callable(self.formatdoc): |
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55 func.__doc__ = self.formatdoc(doc) |
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56 else: |
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57 # convenient shortcut for simple format |
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58 func.__doc__ = self.formatdoc % (self.decl, doc) |
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59 |
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60 self.table[name] = func |
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61 self.extraaction(name, func) |
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62 |
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63 return func |
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64 |
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65 def getname(self): |
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66 """Return the name of the registered function from self.decl |
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67 |
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68 Derived class should override this, if it allows more |
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69 descriptive 'decl' string than just a name. |
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70 """ |
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71 return self.decl |
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72 |
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73 def parsefuncdecl(self): |
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74 """Parse function declaration and return the name of function in it |
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75 """ |
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76 i = self.decl.find('(') |
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77 if i > 0: |
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78 return self.decl[:i] |
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79 else: |
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80 return self.decl |
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81 |
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82 def formatdoc(self, doc): |
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83 """Return formatted document of the registered function for help |
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84 |
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85 'doc' is '__doc__.strip()' of the registered function. |
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86 |
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87 If this is overridden by non-callable object in derived class, |
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88 such value is treated as "format string" and used to format |
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89 document by 'self.formatdoc % (self.decl, doc)' for convenience. |
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90 """ |
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91 raise NotImplementedError() |
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92 |
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93 def extraaction(self, name, func): |
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94 """Execute exra action for registered function, if needed |
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95 """ |
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96 pass |
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97 |
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98 class delayregistrar(object): |
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99 """Decorator to delay actual registration until uisetup or so |
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100 |
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101 For example, the decorator class to delay registration by |
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102 'keyword' funcregistrar can be defined as below:: |
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103 |
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104 class extkeyword(delayregistrar): |
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105 registrar = keyword |
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106 """ |
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107 def __init__(self): |
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108 self._list = [] |
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109 |
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110 registrar = None |
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111 |
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112 def __call__(self, *args, **kwargs): |
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113 """Return the decorator to delay actual registration until setup |
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114 """ |
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115 assert self.registrar is not None |
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116 def decorator(func): |
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117 # invocation of self.registrar() here can detect argument |
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118 # mismatching immediately |
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119 self._list.append((func, self.registrar(*args, **kwargs))) |
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120 return func |
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121 return decorator |
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122 |
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123 def setup(self): |
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124 """Execute actual registration |
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125 """ |
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126 while self._list: |
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127 func, decorator = self._list.pop(0) |
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128 decorator(func) |
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129 |
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130 class _funcregistrarbase(object): |
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131 """Base of decorator to register a fuction for specific purpose |
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132 |
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133 This decorator stores decorated functions into own dict 'table'. |
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134 |
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135 The least derived class can be defined by overriding 'formatdoc', |
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136 for example:: |
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137 |
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138 class keyword(_funcregistrarbase): |
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139 _docformat = ":%s: %s" |
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140 |
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141 This should be used as below: |
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142 |
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143 keyword = registrar.keyword() |
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144 |
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145 @keyword('bar') |
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146 def barfunc(*args, **kwargs): |
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147 '''Explanation of bar keyword .... |
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148 ''' |
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149 pass |
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150 |
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151 In this case: |
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152 |
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153 - 'barfunc' is stored as 'bar' in '_table' of an instance 'keyword' above |
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154 - 'barfunc.__doc__' becomes ":bar: Explanation of bar keyword" |
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155 """ |
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156 def __init__(self, table=None): |
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157 if table is None: |
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158 self._table = {} |
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159 else: |
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160 self._table = table |
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161 |
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162 def __call__(self, decl, *args, **kwargs): |
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163 return lambda func: self._doregister(func, decl, *args, **kwargs) |
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164 |
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165 def _doregister(self, func, decl, *args, **kwargs): |
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166 name = self._getname(decl) |
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167 |
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168 if func.__doc__ and not util.safehasattr(func, '_origdoc'): |
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169 doc = func.__doc__.strip() |
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170 func._origdoc = doc |
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171 func.__doc__ = self._formatdoc(decl, doc) |
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172 |
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173 self._table[name] = func |
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174 self._extrasetup(name, func, *args, **kwargs) |
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175 |
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176 return func |
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177 |
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178 def _parsefuncdecl(self, decl): |
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179 """Parse function declaration and return the name of function in it |
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180 """ |
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181 i = decl.find('(') |
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182 if i >= 0: |
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183 return decl[:i] |
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184 else: |
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185 return decl |
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186 |
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187 def _getname(self, decl): |
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188 """Return the name of the registered function from decl |
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189 |
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190 Derived class should override this, if it allows more |
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191 descriptive 'decl' string than just a name. |
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192 """ |
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193 return decl |
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194 |
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195 _docformat = None |
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196 |
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197 def _formatdoc(self, decl, doc): |
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198 """Return formatted document of the registered function for help |
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199 |
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200 'doc' is '__doc__.strip()' of the registered function. |
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201 """ |
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202 return self._docformat % (decl, doc) |
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203 |
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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204 def _extrasetup(self, name, func): |
b983a2f04987
registrar: introduce new class for registration to replace funcregistrar
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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205 """Execute exra setup for registered function, if needed |
b983a2f04987
registrar: introduce new class for registration to replace funcregistrar
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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206 """ |
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registrar: introduce new class for registration to replace funcregistrar
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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changeset
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207 pass |