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annotate roundup/mlink_expr.py @ 8513:d7d91e25a1c2

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chore(build): bump anchore/scan-action from 7.2.3 to 7.3.0 pull #80
author John Rouillard <rouilj@ieee.org>
date Tue, 27 Jan 2026 21:41:37 -0500
parents 224ccb8b49ca
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 __slots__ = ("x", "y")
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64
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65 def __init__(self, x, y):
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66 self.x = x
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67 self.y = y
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68
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69 def visit(self, visitor):
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70 self.x.visit(visitor)
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71 self.y.visit(visitor)
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72
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73
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74 class Unary:
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75
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76 __slots__ = ("x",)
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77
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78 def __init__(self, x):
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79 self.x = x
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80
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81 def generate(self, atom):
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82 return atom(self)
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83
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84 def visit(self, visitor):
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85 self.x.visit(visitor)
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86
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87
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88 class Equals(Unary):
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89
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90 __slots__ = ()
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91
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92 def evaluate(self, v):
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93 return self.x in v
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94
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95 def visit(self, visitor):
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96 visitor(self)
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97
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98 def __repr__(self):
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99 return "Value %s" % self.x
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100
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101
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102 class Empty(Unary):
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103
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104 __slots__ = ()
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105
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106 def evaluate(self, v):
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107 return not v
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108
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109 def visit(self, visitor):
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110 visitor(self)
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111
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112 def __repr__(self):
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113 return "ISEMPTY(-1)"
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114
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115
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116 class Not(Unary):
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117
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118 __slots__ = ()
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119
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120 def evaluate(self, v):
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121 return not self.x.evaluate(v)
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122
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123 def generate(self, atom):
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124 return "NOT(%s)" % self.x.generate(atom)
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125
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126 def __repr__(self):
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127 return "NOT(%s)" % self.x
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128
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129
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130 class Or(Binary):
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131
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132 __slots__ = ()
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133
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134 def evaluate(self, v):
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135 return self.x.evaluate(v) or self.y.evaluate(v)
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136
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137 def generate(self, atom):
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138 return "(%s)OR(%s)" % (
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139 self.x.generate(atom),
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140 self.y.generate(atom))
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141
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142 def __repr__(self):
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143 return "(%s OR %s)" % (self.y, self.x)
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144
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145
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146 class And(Binary):
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147
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148 __slots__ = ()
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149
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150 def evaluate(self, v):
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151 return self.x.evaluate(v) and self.y.evaluate(v)
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152
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153 def generate(self, atom):
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154 return "(%s)AND(%s)" % (
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155 self.x.generate(atom),
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156 self.y.generate(atom))
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157
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158 def __repr__(self):
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159 return "(%s AND %s)" % (self.y, self.x)
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160
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161
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162 def compile_expression(opcodes):
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163
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164 stack = []
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165 push, pop = stack.append, stack.pop
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166 try:
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167 for position, opcode in enumerate(opcodes): # noqa: B007
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168 if opcode == -1: push(Empty(opcode)) # noqa: E271,E701
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169 elif opcode == -2: push(Not(pop())) # noqa: E701
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170 elif opcode == -3: push(And(pop(), pop())) # noqa: E701
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171 elif opcode == -4: push(Or(pop(), pop())) # noqa: E701
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172 else: push(Equals(opcode)) # noqa: E701
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173 except IndexError:
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174 raise ExpressionError(
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175 _("There was an error searching %(class)s by %(attr)s using: "
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176 "%(opcodes)s. "
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177 "The operator %(opcode)s (%(opcodename)s) at position "
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178 "%(position)d has too few arguments."),
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179 context={
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180 "opcode": opcode,
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181 "opcodename": opcode_names[opcode],
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182 "position": position + 1,
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183 "opcodes": opcodes,
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184 })
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185 if len(stack) != 1:
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186 # Too many arguments - I don't think stack can be zero length
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187 raise ExpressionError(
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188 _("There was an error searching %(class)s by %(attr)s using: "
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189 "%(opcodes)s. "
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190 "There are too many arguments for the existing operators. The "
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191 "values on the stack are: %(stack)s"),
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192 context={
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193 "opcodes": opcodes,
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194 "stack": stack,
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195 })
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196
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197 return pop()
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198
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199
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200 class Expression:
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201
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202 __slots__ = ("evaluate",)
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203
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204 def __init__(self, v, is_link=False):
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205 try:
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206 opcodes = [int(x) for x in v]
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207 if min(opcodes) >= -1:
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208 raise ValueError()
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209
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210 compiled = compile_expression(opcodes)
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211 if is_link:
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212 self.evaluate = lambda x: compiled.evaluate(
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213 (x and [int(x)]) or [])
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214 else:
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215 self.evaluate = lambda x: compiled.evaluate([int(y) for y in x])
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216 except (ValueError, TypeError):
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217 if is_link:
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218 v = [None if x == '-1' else x for x in v]
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219 self.evaluate = lambda x: x in v
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220 elif '-1' in v:
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221 v = [x for x in v if int(x) > 0]
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222 self.evaluate = lambda x: bool(set(x) & set(v)) or not x
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223 else:
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224 self.evaluate = lambda x: bool(set(x) & set(v))
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225 except BaseException:
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226 raise
Roundup Issue Tracker: http://roundup-tracker.org/