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87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
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import token
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import tokenize
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from typing import List, Iterator
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Mark = int # NewType('Mark', int)
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exact_token_types = token.EXACT_TOKEN_TYPES # type: ignore
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def shorttok(tok: tokenize.TokenInfo) -> str:
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return "%-25.25s" % f"{tok.start[0]}.{tok.start[1]}: {token.tok_name[tok.type]}:{tok.string!r}"
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class Tokenizer:
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"""Caching wrapper for the tokenize module.
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This is pretty tied to Python's syntax.
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"""
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_tokens: List[tokenize.TokenInfo]
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def __init__(self, tokengen: Iterator[tokenize.TokenInfo], *, verbose: bool = False):
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self._tokengen = tokengen
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self._tokens = []
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self._index = 0
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self._verbose = verbose
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if verbose:
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self.report(False, False)
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def getnext(self) -> tokenize.TokenInfo:
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"""Return the next token and updates the index."""
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cached = True
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while self._index == len(self._tokens):
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tok = next(self._tokengen)
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if tok.type in (tokenize.NL, tokenize.COMMENT):
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continue
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if tok.type == token.ERRORTOKEN and tok.string.isspace():
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continue
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self._tokens.append(tok)
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cached = False
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tok = self._tokens[self._index]
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self._index += 1
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if self._verbose:
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self.report(cached, False)
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return tok
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def peek(self) -> tokenize.TokenInfo:
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"""Return the next token *without* updating the index."""
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while self._index == len(self._tokens):
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tok = next(self._tokengen)
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if tok.type in (tokenize.NL, tokenize.COMMENT):
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continue
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if tok.type == token.ERRORTOKEN and tok.string.isspace():
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continue
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self._tokens.append(tok)
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return self._tokens[self._index]
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def diagnose(self) -> tokenize.TokenInfo:
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if not self._tokens:
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self.getnext()
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return self._tokens[-1]
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def mark(self) -> Mark:
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return self._index
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def reset(self, index: Mark) -> None:
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if index == self._index:
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return
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assert 0 <= index <= len(self._tokens), (index, len(self._tokens))
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old_index = self._index
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self._index = index
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if self._verbose:
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self.report(True, index < old_index)
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def report(self, cached: bool, back: bool) -> None:
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if back:
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fill = "-" * self._index + "-"
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elif cached:
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fill = "-" * self._index + ">"
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else:
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fill = "-" * self._index + "*"
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if self._index == 0:
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print(f"{fill} (Bof)")
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else:
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tok = self._tokens[self._index - 1]
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print(f"{fill} {shorttok(tok)}")
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