57 lines
1.6 KiB
Python
57 lines
1.6 KiB
Python
from smnp.ast.node.operator import BinaryOperator
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from smnp.ast.node.term import TermParser
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from smnp.ast.node.valuable import Valuable
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from smnp.ast.parser import Parser
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from smnp.token.type import TokenType
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class Expression(Valuable):
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pass
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def ExpressionParser(input):
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from smnp.ast.node.condition import IfElse
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expr1 = Parser.leftAssociativeOperatorParser(
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TermParser,
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[TokenType.PLUS, TokenType.MINUS],
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TermParser,
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lambda left, op, right: Expression.withValue(BinaryOperator.withValues(left, op, right))
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)
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expr2 = Parser.leftAssociativeOperatorParser(
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expr1,
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[TokenType.RELATION, TokenType.OPEN_ANGLE, TokenType.CLOSE_ANGLE],
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expr1,
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lambda left, op, right: Expression.withValue(BinaryOperator.withValues(left, op, right))
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)
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expr3 = Parser.leftAssociativeOperatorParser(
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expr2,
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[TokenType.AND],
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expr2,
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lambda left, op, right: Expression.withValue(BinaryOperator.withValues(left, op, right))
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)
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expr4 = Parser.leftAssociativeOperatorParser(
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expr3,
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[TokenType.OR],
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expr3,
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lambda left, op, right: Expression.withValue(BinaryOperator.withValues(left, op, right))
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)
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ifElseExpression = Parser.allOf(
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expr4,
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Parser.terminal(TokenType.IF),
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expr4,
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Parser.terminal(TokenType.ELSE),
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expr4,
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createNode=lambda ifNode, _, condition, __, elseNode: IfElse.createNode(ifNode, condition, elseNode)
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)
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return Parser.oneOf(
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ifElseExpression,
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expr4,
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)(input)
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