Mercurial > p > roundup > code

annotate roundup/mlink_expr.py @ 8264:09e8d1a4c796

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docs: clarify wording, fix index, add superseder link Make superseder, messages etc. properties index entries point to the right place. Link to description of using Superseder in the original overview. fix bad wording on boolean properties.
author John Rouillard <rouilj@ieee.org>
date Wed, 08 Jan 2025 11:39:54 -0500
parents 741ea8a86012
children 224ccb8b49ca
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1 #
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2 # Copyright: 2010 Intevation GmbH.
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3 # 2021 Ralf Schlatterbeck, rsc@runtux.com.
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4 #
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5
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6 # This module is Free Software under the Roundup licensing,
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7 # see the COPYING.txt file coming with Roundup.
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8 #
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9
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10 from roundup.exceptions import RoundupException
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11 from roundup.i18n import _
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12
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13 opcode_names = {
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14 -2: "not",
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15 -3: "and",
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16 -4: "or",
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17 }
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18
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19
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20 class ExpressionError(RoundupException):
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21 """Takes two arguments.
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22
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23 ExpressionError(template, context={})
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24
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25 The repr of ExpressionError is:
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26
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27 template % context
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28
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29 """
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30
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31 # only works on python 3
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32 #def __init__(self, *args, context=None):
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33 # super().__init__(*args)
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34 # self.context = context if isinstance(context, dict) else {}
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35
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36 # works python 2 and 3
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37 def __init__(self, *args, **kwargs):
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38 super(RoundupException, self).__init__(*args)
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39 self.context = {}
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40 if 'context' in kwargs and isinstance(kwargs['context'], dict):
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41 self.context = kwargs['context']
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42
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43 # Skip testing for a bad call to ExpressionError
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44 # keywords = [x for x in list(kwargs) if x != "context"]
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45 #if len(keywords) != 0:
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46 # raise ValueError("unknown keyword argument(s) passed to ExpressionError: %s" % keywords)
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47
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48 def __str__(self):
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49 try:
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50 return self.args[0] % self.context
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51 except KeyError:
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52 return "%s: context=%s" % (self.args[0], self.context)
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53
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54 def __repr__(self):
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55 try:
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56 return self.args[0] % self.context
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57 except KeyError:
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58 return "%s: context=%s" % (self.args[0], self.context)
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59
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60
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61 class Binary:
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62
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63 def __init__(self, x, y):
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64 self.x = x
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65 self.y = y
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66
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67 def visit(self, visitor):
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68 self.x.visit(visitor)
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69 self.y.visit(visitor)
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71
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72 class Unary:
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73
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74 def __init__(self, x):
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75 self.x = x
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76
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77 def generate(self, atom):
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78 return atom(self)
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79
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80 def visit(self, visitor):
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81 self.x.visit(visitor)
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82
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83
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84 class Equals(Unary):
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85
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86 def evaluate(self, v):
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87 return self.x in v
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88
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89 def visit(self, visitor):
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90 visitor(self)
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91
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92 def __repr__(self):
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93 return "Value %s" % self.x
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94
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95
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96 class Empty(Unary):
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97
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98 def evaluate(self, v):
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99 return not v
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100
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101 def visit(self, visitor):
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102 visitor(self)
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103
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104 def __repr__(self):
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105 return "ISEMPTY(-1)"
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106
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107
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108 class Not(Unary):
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109
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110 def evaluate(self, v):
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111 return not self.x.evaluate(v)
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112
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113 def generate(self, atom):
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114 return "NOT(%s)" % self.x.generate(atom)
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115
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116 def __repr__(self):
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117 return "NOT(%s)" % self.x
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118
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119
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120 class Or(Binary):
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121
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122 def evaluate(self, v):
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123 return self.x.evaluate(v) or self.y.evaluate(v)
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124
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125 def generate(self, atom):
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126 return "(%s)OR(%s)" % (
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127 self.x.generate(atom),
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128 self.y.generate(atom))
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129
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130 def __repr__(self):
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131 return "(%s OR %s)" % (self.y, self.x)
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132
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133
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134 class And(Binary):
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135
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136 def evaluate(self, v):
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137 return self.x.evaluate(v) and self.y.evaluate(v)
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138
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139 def generate(self, atom):
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140 return "(%s)AND(%s)" % (
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141 self.x.generate(atom),
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142 self.y.generate(atom))
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143
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144 def __repr__(self):
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145 return "(%s AND %s)" % (self.y, self.x)
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146
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147
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148 def compile_expression(opcodes):
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149
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150 stack = []
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151 push, pop = stack.append, stack.pop
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152 try:
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153 for position, opcode in enumerate(opcodes): # noqa: B007
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154 if opcode == -1: push(Empty(opcode)) # noqa: E271,E701
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155 elif opcode == -2: push(Not(pop())) # noqa: E701
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156 elif opcode == -3: push(And(pop(), pop())) # noqa: E701
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157 elif opcode == -4: push(Or(pop(), pop())) # noqa: E701
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158 else: push(Equals(opcode)) # noqa: E701
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159 except IndexError:
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160 raise ExpressionError(
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161 _("There was an error searching %(class)s by %(attr)s using: "
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162 "%(opcodes)s. "
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163 "The operator %(opcode)s (%(opcodename)s) at position "
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164 "%(position)d has too few arguments."),
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165 context={
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166 "opcode": opcode,
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167 "opcodename": opcode_names[opcode],
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168 "position": position + 1,
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169 "opcodes": opcodes,
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170 })
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171 if len(stack) != 1:
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172 # Too many arguments - I don't think stack can be zero length
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173 raise ExpressionError(
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174 _("There was an error searching %(class)s by %(attr)s using: "
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175 "%(opcodes)s. "
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176 "There are too many arguments for the existing operators. The "
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177 "values on the stack are: %(stack)s"),
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178 context={
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179 "opcodes": opcodes,
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180 "stack": stack,
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181 })
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182
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183 return pop()
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184
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185
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186 class Expression:
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187
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188 def __init__(self, v, is_link=False):
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189 try:
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190 opcodes = [int(x) for x in v]
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191 if min(opcodes) >= -1:
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192 raise ValueError()
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193
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194 compiled = compile_expression(opcodes)
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195 if is_link:
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196 self.evaluate = lambda x: compiled.evaluate(
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197 (x and [int(x)]) or [])
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198 else:
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199 self.evaluate = lambda x: compiled.evaluate([int(y) for y in x])
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200 except (ValueError, TypeError):
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201 if is_link:
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202 v = [None if x == '-1' else x for x in v]
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203 self.evaluate = lambda x: x in v
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204 elif '-1' in v:
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205 v = [x for x in v if int(x) > 0]
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206 self.evaluate = lambda x: bool(set(x) & set(v)) or not x
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207 else:
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208 self.evaluate = lambda x: bool(set(x) & set(v))
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209 except BaseException:
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210 raise
Roundup Issue Tracker: http://roundup-tracker.org/