etc404
51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
import re
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from typing import Any
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import lisp
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import atom
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class Reader:
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tokens: list[str|Any]
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def __init__(self):
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self.tokens = []
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self.interpreter = lisp.Lisp()
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def tokenize(self, expression: str):
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self.tokens += re.findall(r"""[\s,]*[;.*]*([()']|"(?:\\.|[^\\"])*"?|[^\s()'",;]*)""", expression)
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while self.peek() != "":
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self.read_expression()
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self.consume()
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def peek(self):
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return self.tokens[0]
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def consume(self):
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token = self.tokens[0]
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self.tokens = self.tokens[1:]
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return token
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def read_expression(self) -> atom.Atom | None:
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if len(self.tokens) == 0:
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return None
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if self.peek() == "(":
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self.consume()
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return self.read_list()
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else:
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return self.read_atom()
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def read_list(self):
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token = self.peek()
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last = atom.Atom(None, None)
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first = last
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while token != ")":
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last.setval(self.read_expression())
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last.append(atom.Atom(None, None))
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last = last.cdr
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token = self.peek()
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self.consume()
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return first
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def read_atom(self) -> atom.Atom:
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print(self.peek())
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return atom.Atom(self.consume(), None) |