| 1 | import ast
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| 2 | from ast import stmt, ClassDef, FunctionDef, Assign
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| 3 |
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| 4 | import typing
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| 5 | from typing import Any
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| 6 |
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| 7 | from pea.header import (TypeSyntaxError, PyFile, Program)
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| 8 | from pea import parse
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| 9 |
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| 10 |
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| 11 | class ConstVisitor(ast.NodeVisitor):
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| 12 |
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| 13 | def __init__(self, const_lookup: dict[str, int]):
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| 14 | ast.NodeVisitor.__init__(self)
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| 15 | self.const_lookup = const_lookup
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| 16 | self.str_id = 0
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| 17 |
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| 18 | def visit_Constant(self, o: ast.Constant) -> None:
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| 19 | if isinstance(o.value, str):
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| 20 | self.const_lookup[o.value] = self.str_id
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| 21 | self.str_id += 1
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| 22 |
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| 23 |
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| 24 | class ForwardDeclPass:
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| 25 | """Emit forward declarations."""
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| 26 |
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| 27 | # TODO: Move this to ParsePass after comparing with mycpp.
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| 28 |
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| 29 | def __init__(self, f: typing.IO[str]) -> None:
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| 30 | self.f = f
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| 31 |
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| 32 | def DoPyFile(self, py_file: PyFile) -> None:
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| 33 |
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| 34 | # TODO: could omit empty namespaces
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| 35 | namespace = py_file.namespace
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| 36 | self.f.write(f'namespace {namespace} {{ // forward declare\n')
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| 37 |
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| 38 | for stmt in py_file.module.body:
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| 39 | match stmt:
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| 40 | case ClassDef():
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| 41 | class_name = stmt.name
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| 42 | self.f.write(f' class {class_name};\n')
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| 43 |
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| 44 | self.f.write(f'}} // forward declare {namespace}\n')
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| 45 | self.f.write('\n')
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| 46 |
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| 47 |
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| 48 | class PrototypesPass:
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| 49 | """Parse signatures and Emit function prototypes."""
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| 50 |
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| 51 | def __init__(self, opts: Any, prog: Program, f: typing.IO[str]) -> None:
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| 52 | self.opts = opts
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| 53 | self.prog = prog
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| 54 | self.f = f
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| 55 |
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| 56 | def DoClass(self, cls: ClassDef) -> None:
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| 57 | for stmt in cls.body:
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| 58 | match stmt:
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| 59 | case FunctionDef():
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| 60 | if stmt.type_comment:
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| 61 | sig = parse.ParseFuncType(stmt) # may raise
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| 62 |
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| 63 | if self.opts.verbose:
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| 64 | print('METHOD')
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| 65 | print(ast.dump(sig, indent=' '))
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| 66 | # TODO: We need to print virtual here
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| 67 |
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| 68 | self.prog.method_types[stmt] = sig # save for ImplPass
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| 69 | self.prog.stats['num_methods'] += 1
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| 70 |
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| 71 | # TODO: assert that there aren't top-level statements?
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| 72 | case _:
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| 73 | pass
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| 74 |
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| 75 | def DoPyFile(self, py_file: PyFile) -> None:
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| 76 | for stmt in py_file.module.body:
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| 77 | match stmt:
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| 78 | case FunctionDef():
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| 79 | if stmt.type_comment:
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| 80 | sig = parse.ParseFuncType(stmt) # may raise
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| 81 |
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| 82 | if self.opts.verbose:
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| 83 | print('FUNC')
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| 84 | print(ast.dump(sig, indent=' '))
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| 85 |
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| 86 | self.prog.func_types[stmt] = sig # save for ImplPass
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| 87 |
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| 88 | self.prog.stats['num_funcs'] += 1
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| 89 |
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| 90 | case ClassDef():
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| 91 | self.DoClass(stmt)
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| 92 | self.prog.stats['num_classes'] += 1
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| 93 |
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| 94 | case _:
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| 95 | # Import, Assign, etc.
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| 96 | #print(stmt)
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| 97 |
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| 98 | # TODO: omit __name__ == '__main__' etc.
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| 99 | # if __name__ == '__main__'
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| 100 | pass
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| 101 |
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| 102 |
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| 103 | class ImplPass:
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| 104 | """Emit function and method bodies.
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| 105 |
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| 106 | Algorithm:
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| 107 | collect local variables first
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| 108 | """
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| 109 |
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| 110 | def __init__(self, prog: Program, f: typing.IO[str]) -> None:
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| 111 | self.prog = prog
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| 112 | self.f = f
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| 113 |
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| 114 | # TODO: needs to be fully recursive, so you get bodies of loops, etc.
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| 115 | def DoBlock(self, stmts: list[stmt], indent: int = 0) -> None:
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| 116 | """e.g. body of function, method, etc."""
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| 117 |
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| 118 | #print('STMTS %s' % stmts)
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| 119 |
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| 120 | ind_str = ' ' * indent
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| 121 |
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| 122 | for stmt in stmts:
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| 123 | match stmt:
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| 124 | case Assign():
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| 125 | #print('%s* Assign' % ind_str)
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| 126 | #print(ast.dump(stmt, indent=' '))
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| 127 |
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| 128 | if stmt.type_comment:
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| 129 | # This parses with the func_type production in the grammar
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| 130 | try:
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| 131 | typ = ast.parse(stmt.type_comment)
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| 132 | except SyntaxError as e:
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| 133 | # New syntax error
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| 134 | raise TypeSyntaxError(stmt.lineno,
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| 135 | stmt.type_comment)
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| 136 |
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| 137 | self.prog.assign_types[stmt] = typ
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| 138 |
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| 139 | #print('%s TYPE: Assign' % ind_str)
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| 140 | #print(ast.dump(typ, indent=' '))
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| 141 |
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| 142 | self.prog.stats['num_assign'] += 1
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| 143 |
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| 144 | case _:
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| 145 | pass
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| 146 |
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| 147 | def DoClass(self, cls: ClassDef) -> None:
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| 148 | for stmt in cls.body:
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| 149 | match stmt:
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| 150 | case FunctionDef():
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| 151 | self.DoBlock(stmt.body, indent=1)
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| 152 |
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| 153 | case _:
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| 154 | pass
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| 155 |
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| 156 | def DoPyFile(self, py_file: PyFile) -> None:
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| 157 | for stmt in py_file.module.body:
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| 158 | match stmt:
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| 159 | case ClassDef():
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| 160 | self.DoClass(stmt)
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| 161 |
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| 162 | case FunctionDef():
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| 163 | self.DoBlock(stmt.body, indent=1)
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