def makeNumber(parent: ParserRuleContext, n: int):
"""This node represents a virtual ParseTree node that does not come from
the parser but rather is constructed via a rewriting rule. For example,
the expression "a-b" is parsed as "Plus[a, Times[-1, b]]" in exitPlusOp(),
so a node for "-1" needs to be created even though "-1" does not appear as
a token in the token stream.
Note that makeNumber sets the NumberContext's parent but does not add
anything to parent's children."""
# The hierarchy is:
# CommonToken->TerminalNodeImpl->NumberLiteralContext
# ->NumberBaseTenContext->NumberContext->parent
digits_token = CommonToken(type=FoxySheepParser.DIGITS)
digits_token._text = str(n)
number = FoxySheepParser.NumberContext(
None, FoxySheepParser.ExprContext(None, parent=parent))
number_literal = FoxySheepParser.NumberBaseTenContext(
None, FoxySheepParser.NumberLiteralContext(None, parent=number))
number_literal.addTokenNode(digits_token)
addChild(number, number_literal)
return number
