Mercurial > p > roundup > code

annotate roundup/mlink_expr.py @ 8453:e5bd50120b5a

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chore(build): update anchore to 7.0.0 via dependabot
author John Rouillard <rouilj@ieee.org>
date Mon, 22 Sep 2025 12:37:21 -0400
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/