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John Doty 2024-08-26 08:05:01 -07:00
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README.md
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@ -23,19 +23,20 @@ To get started, create a grammar that derives from the `Grammar` class. Create
one method per nonterminal, decorated with the `rule` decorator. Here's an one method per nonterminal, decorated with the `rule` decorator. Here's an
example: example:
PLUS = Token('+')
LPAREN = Token('(')
RPAREN = Token(')')
ID = Token('id')
class SimpleGrammar(Grammar): class SimpleGrammar(Grammar):
@rule @rule
def expression(self): def expression(self):
return seq(self.expression, PLUS, self.term) | self.term return seq(self.expression, self.PLUS, self.term) | self.term
@rule @rule
def term(self): def term(self):
return seq(LPAREN, self.expression, RPAREN) | ID return seq(self.LPAREN, self.expression, self.RPAREN) | self.ID
PLUS = Terminal('+')
LPAREN = Terminal('(')
RPAREN = Terminal(')')
ID = Terminal('id')
## Using grammars ## Using grammars