+import re
+
+class Expr:
+ """A single regular expression for matching boards to build"""
+
+ def __init__(self, expr):
+ """Set up a new Expr object.
+
+ Args:
+ expr: String cotaining regular expression to store
+ """
+ self._expr = expr
+ self._re = re.compile(expr)
+
+ def Matches(self, props):
+ """Check if any of the properties match the regular expression.
+
+ Args:
+ props: List of properties to check
+ Returns:
+ True if any of the properties match the regular expression
+ """
+ for prop in props:
+ if self._re.match(prop):
+ return True
+ return False
+
+ def __str__(self):
+ return self._expr
+
+class Term:
+ """A list of expressions each of which must match with properties.
+
+ This provides a list of 'AND' expressions, meaning that each must
+ match the board properties for that board to be built.
+ """
+ def __init__(self):
+ self._expr_list = []
+ self._board_count = 0
+
+ def AddExpr(self, expr):
+ """Add an Expr object to the list to check.
+
+ Args:
+ expr: New Expr object to add to the list of those that must
+ match for a board to be built.
+ """
+ self._expr_list.append(Expr(expr))
+
+ def __str__(self):
+ """Return some sort of useful string describing the term"""
+ return '&'.join([str(expr) for expr in self._expr_list])
+
+ def Matches(self, props):
+ """Check if any of the properties match this term
+
+ Each of the expressions in the term is checked. All must match.
+
+ Args:
+ props: List of properties to check
+ Returns:
+ True if all of the expressions in the Term match, else False
+ """
+ for expr in self._expr_list:
+ if not expr.Matches(props):
+ return False
+ return True
+