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from typing import List
from parse.base import BaseParser
from lexer import LexToken, Token
from astree.type import Type, BuiltinType, FuncType, FuncParam
from errors import Error
class ParseType:
def __init__(self, parser: BaseParser):
self.parser = parser
def _type(self) -> (Type | Error):
types = [Token.BOOLEAN, Token.CHAR, Token.INT, Token.STRING, Token.VOID]
tok = self.parser.want(*types)
if type(tok) is Error:
return tok
return BuiltinType(tok.tipo)
def prototype(self) -> (FuncType | Error):
params: List[FuncParam] = []
# Tipo
tok = ParseType(self.parser)._type()
if type(tok) is Error:
return tok
_type = tok
# (
tok = self.parser.want(Token.L_PAREN)
if type(tok) is Error:
return tok
while True:
tok = self.parser._try(Token.R_PAREN)
if not tok:
break
# Tipo
tok = ParseType(self.parser)._type()
if type(tok) is Error:
return tok
__type: Type = tok
# Identificador
tok = self.parser.want(Token.IDENT)
if type(tok) is Error:
return tok
name: str = tok
params.append(FuncParam(name = name,
_type = __type))
# ,
tok = self.parser._try(Token.COMMA)
if not tok:
continue
# )
tok = self.parser.want(Token.R_PAREN)
if type(tok) is Error:
return tok
return FuncType(result = _type,
params = params)
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