[英]How do I add operator precedence to a lark grammar for FOL with Equality?
[英]How should I define a NOT operator which supports both NOT and AND NOT in LARK
這是我當前代碼的樣子,它只支持a AND NOT b
。 有沒有辦法讓它也為a NOT b
返回相同的樹? 任何建議將不勝感激。
from lark import Lark
grammar = r'''
start: or_test
?or_test: and_test ("OR" and_test)*
?and_test: not_test ("AND" not_test)*
?not_test: "NOT" not_test -> not
| atom
atom: WORD -> term
| "(" or_test ")"
WORD: /[a-zA-Z0-9]+/
%import common.WS_INLINE
%ignore WS_INLINE
'''
parser = Lark(grammar)
s = 'NOT a AND b AND NOT c'
tree = parser.parse(s)
print(tree.pretty())
輸出
start
and_test
not
term a
term b
not
term c
我認為這應該做你問的:
from lark import Lark
grammar = r'''
start: or_test
?or_test: and_test ("OR" and_test)*
?and_test: not_test ("AND" not_test | and_not)*
and_not: "NOT" not_test -> not
?not_test: "NOT" not_test -> not
| atom
atom: WORD -> term
| "(" or_test ")"
WORD: /[a-zA-Z0-9]+/
%import common.WS_INLINE
%ignore WS_INLINE
'''
parser = Lark(grammar)
s = 'NOT a AND b AND NOT c NOT d'
tree = parser.parse(s)
print(tree.pretty())
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