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from dataclasses import dataclass
from enum import Enum, auto
from typing import TypeVar, List
T = TypeVar("T", int, float, str, bool)
# classes
class NebType(Enum):
INT = auto()
FLOAT = auto()
STRING = auto()
BOOL = auto()
@dataclass
class NebToken:
pass
@dataclass
class NebLiteral(NebToken):
type_: NebType
value: T
class NebSeparator(NebToken):
pass
class NebOpen(NebSeparator):
pass
class NebClose(NebSeparator):
pass
@dataclass
class NebSymbol(NebToken):
name: str
@dataclass
class NebExpression(NebToken):
symbol: NebSymbol
args: List[NebToken]
def maybe_sig(self):
out = []
for arg in self.args:
if isinstance(arg, NebLiteral):
out.append(":" + arg.type_.name.lower())
else:
raise Exception("expressions must have a list of literals") #TODO not true
return " ".join(out)
@dataclass
class NebFunction(NebToken):
name: str
args: List[NebType]
returns: NebType
def in_sig(self):
return " ".join(":" + x.name.lower() for x in self.args)
def out_sig(self):
return ":" + self.returns.lower()
def sig(self):
return (self.in_sig() + " > " + self.out_sig()).strip()
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