A writer that understands tokens and how to format C code
| 4 | from io import StringIO |
| 5 | |
| 6 | class CWriter: |
| 7 | "A writer that understands tokens and how to format C code" |
| 8 | |
| 9 | last_token: Token | None |
| 10 | |
| 11 | def __init__(self, out: TextIO, indent: int, line_directives: bool): |
| 12 | self.out = out |
| 13 | self.base_column = indent * 4 |
| 14 | self.indents = [i * 4 for i in range(indent + 1)] |
| 15 | self.line_directives = line_directives |
| 16 | self.last_token = None |
| 17 | self.newline = True |
| 18 | self.pending_spill = False |
| 19 | self.pending_reload = False |
| 20 | |
| 21 | @staticmethod |
| 22 | def null() -> "CWriter": |
| 23 | return CWriter(StringIO(), 0, False) |
| 24 | |
| 25 | def set_position(self, tkn: Token) -> None: |
| 26 | if self.last_token is not None: |
| 27 | if self.last_token.end_line < tkn.line: |
| 28 | self.out.write("\n") |
| 29 | if self.last_token.line < tkn.line: |
| 30 | if self.line_directives: |
| 31 | self.out.write(f'#line {tkn.line} "{tkn.filename}"\n') |
| 32 | self.out.write(" " * self.indents[-1]) |
| 33 | else: |
| 34 | gap = tkn.column - self.last_token.end_column |
| 35 | self.out.write(" " * gap) |
| 36 | elif self.newline: |
| 37 | self.out.write(" " * self.indents[-1]) |
| 38 | self.last_token = tkn |
| 39 | self.newline = False |
| 40 | |
| 41 | def emit_at(self, txt: str, where: Token) -> None: |
| 42 | self.maybe_write_spill() |
| 43 | self.set_position(where) |
| 44 | self.out.write(txt) |
| 45 | |
| 46 | def maybe_dedent(self, txt: str) -> None: |
| 47 | parens = txt.count("(") - txt.count(")") |
| 48 | if parens < 0: |
| 49 | self.indents.pop() |
| 50 | braces = txt.count("{") - txt.count("}") |
| 51 | if braces < 0 or is_label(txt): |
| 52 | self.indents.pop() |
| 53 | |
| 54 | def maybe_indent(self, txt: str) -> None: |
| 55 | parens = txt.count("(") - txt.count(")") |
| 56 | if parens > 0: |
| 57 | if self.last_token: |
| 58 | offset = self.last_token.end_column - 1 |
| 59 | if offset <= self.indents[-1] or offset > 40: |
| 60 | offset = self.indents[-1] + 4 |
| 61 | else: |
| 62 | offset = self.indents[-1] + 4 |
| 63 | self.indents.append(offset) |
no outgoing calls
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