| 1 | """
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| 2 | util.py
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| 3 | """
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| 4 | from __future__ import print_function
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| 5 |
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| 6 | import sys
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| 7 | from mypy.nodes import CallExpr, IfStmt, Block, Expression, MypyFile
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| 8 |
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| 9 | from typing import Any, Sequence, Optional
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| 10 |
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| 11 | # Used by cppgen_pass and const_pass
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| 12 |
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| 13 | # mycpp/examples/small_str.py sorta works with this!
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| 14 | #SMALL_STR = True
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| 15 |
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| 16 | SMALL_STR = False
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| 17 |
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| 18 | SymbolPath = Sequence[str]
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| 19 |
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| 20 |
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| 21 | def log(msg: str, *args: Any) -> None:
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| 22 | if args:
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| 23 | msg = msg % args
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| 24 | print(msg, file=sys.stderr)
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| 25 |
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| 26 |
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| 27 | def join_name(parts: SymbolPath,
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| 28 | strip_package: bool = False,
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| 29 | delim: str = '::') -> str:
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| 30 | """
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| 31 | Join the given name path into a string with the given delimiter.
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| 32 | Use strip_package to remove the top-level directory (e.g. `core`, `ysh`)
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| 33 | when dealing with C++ namespaces.
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| 34 | """
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| 35 | if not strip_package:
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| 36 | return delim.join(parts)
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| 37 |
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| 38 | if len(parts) > 1:
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| 39 | return delim.join(('', ) + parts[1:])
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| 40 |
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| 41 | return parts[0]
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| 42 |
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| 43 |
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| 44 | def split_py_name(name: str) -> SymbolPath:
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| 45 | ret = tuple(name.split('.'))
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| 46 | if len(ret) and ret[0] == 'mycpp':
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| 47 | # Drop the prefix 'mycpp.' if present. This makes names compatible with
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| 48 | # the examples that use testpkg.
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| 49 | return ret[1:]
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| 50 |
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| 51 | return ret
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| 52 |
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| 53 |
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| 54 | def _collect_cases(module_path: str,
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| 55 | if_node: IfStmt,
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| 56 | out: list[tuple[Expression, Block]],
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| 57 | errors=None) -> Optional[Block] | bool:
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| 58 | """
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| 59 | The MyPy AST has a recursive structure for if-elif-elif rather than a
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| 60 | flat one. It's a bit confusing.
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| 61 |
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| 62 | Appends (expr, block) cases to out param, and returns the default
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| 63 | block, which has no expression.
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| 64 |
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| 65 | default block may be None.
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| 66 |
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| 67 | Returns False if there is no default block.
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| 68 | """
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| 69 | assert isinstance(if_node, IfStmt), if_node
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| 70 | assert len(if_node.expr) == 1, if_node.expr
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| 71 | assert len(if_node.body) == 1, if_node.body
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| 72 |
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| 73 | expr = if_node.expr[0]
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| 74 | body = if_node.body[0]
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| 75 |
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| 76 | if not isinstance(expr, CallExpr):
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| 77 | if errors is not None:
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| 78 | errors.append((module_path, expr.line,
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| 79 | 'Expected call like case(x), got %s' % expr))
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| 80 | return
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| 81 |
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| 82 | out.append((expr, body))
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| 83 |
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| 84 | if if_node.else_body:
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| 85 | first_of_block = if_node.else_body.body[0]
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| 86 | # BUG: this is meant for 'elif' only. But it also triggers for
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| 87 | #
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| 88 | # else:
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| 89 | # if 0:
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| 90 |
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| 91 | if isinstance(first_of_block, IfStmt):
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| 92 | return _collect_cases(module_path, first_of_block, out, errors)
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| 93 | else:
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| 94 | # default case - no expression
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| 95 | return if_node.else_body
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| 96 |
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| 97 | return False # NO DEFAULT BLOCK - Different than None
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| 98 |
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| 99 |
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| 100 | def ShouldSkipPyFile(node: MypyFile) -> bool:
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| 101 | # Skip some stdlib stuff. A lot of it is brought in by 'import
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| 102 | # typing'. These module are special; their contents are currently all
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| 103 | # built-in primitives.
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| 104 | return node.fullname in ('__future__', 'sys', 'types', 'typing', 'abc',
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| 105 | '_ast', 'ast', '_weakrefset', 'collections',
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| 106 | 'cStringIO', 're', 'builtins')
|