| 1 | """
|
| 2 | visitor.py - AST pass that accepts everything.
|
| 3 | """
|
| 4 | from typing import overload, Union, Optional
|
| 5 |
|
| 6 | import mypy
|
| 7 | from mypy.visitor import ExpressionVisitor, StatementVisitor
|
| 8 | from mypy.nodes import (Expression, Statement, ExpressionStmt, StrExpr,
|
| 9 | CallExpr, NameExpr)
|
| 10 |
|
| 11 | from mycpp.crash import catch_errors
|
| 12 | from mycpp.util import split_py_name
|
| 13 | from mycpp import util
|
| 14 |
|
| 15 | T = None # TODO: Make it type check?
|
| 16 |
|
| 17 |
|
| 18 | class UnsupportedException(Exception):
|
| 19 | pass
|
| 20 |
|
| 21 |
|
| 22 | class SimpleVisitor(ExpressionVisitor[T], StatementVisitor[None]):
|
| 23 | """
|
| 24 | A simple AST visitor that accepts every node in the AST. Derrived classes
|
| 25 | can override the visit methods that are relevant to them.
|
| 26 | """
|
| 27 |
|
| 28 | def __init__(self):
|
| 29 | self.current_class_name = None
|
| 30 |
|
| 31 | #
|
| 32 | # COPIED from IRBuilder
|
| 33 | #
|
| 34 |
|
| 35 | @overload
|
| 36 | def accept(self, node: Expression) -> T:
|
| 37 | ...
|
| 38 |
|
| 39 | @overload
|
| 40 | def accept(self, node: Statement) -> None:
|
| 41 | ...
|
| 42 |
|
| 43 | def accept(self, node: Union[Statement, Expression]) -> Optional[T]:
|
| 44 | with catch_errors(self.module_path, node.line):
|
| 45 | if isinstance(node, Expression):
|
| 46 | try:
|
| 47 | res = node.accept(self)
|
| 48 | #res = self.coerce(res, self.node_type(node), node.line)
|
| 49 |
|
| 50 | # If we hit an error during compilation, we want to
|
| 51 | # keep trying, so we can produce more error
|
| 52 | # messages. Generate a temp of the right type to keep
|
| 53 | # from causing more downstream trouble.
|
| 54 | except UnsupportedException:
|
| 55 | res = self.alloc_temp(self.node_type(node))
|
| 56 | return res
|
| 57 | else:
|
| 58 | try:
|
| 59 | node.accept(self)
|
| 60 | except UnsupportedException:
|
| 61 | pass
|
| 62 | return None
|
| 63 |
|
| 64 | # Not in superclasses:
|
| 65 |
|
| 66 | def visit_mypy_file(self, o: 'mypy.nodes.MypyFile') -> T:
|
| 67 | if util.ShouldSkipPyFile(o):
|
| 68 | return
|
| 69 |
|
| 70 | self.module_path = o.path
|
| 71 |
|
| 72 | for node in o.defs:
|
| 73 | # skip module docstring
|
| 74 | if isinstance(node, ExpressionStmt) and isinstance(
|
| 75 | node.expr, StrExpr):
|
| 76 | continue
|
| 77 | self.accept(node)
|
| 78 |
|
| 79 | # LITERALS
|
| 80 |
|
| 81 | def visit_for_stmt(self, o: 'mypy.nodes.ForStmt') -> T:
|
| 82 | self.accept(o.expr)
|
| 83 | self.accept(o.body)
|
| 84 |
|
| 85 | def visit_with_stmt(self, o: 'mypy.nodes.WithStmt') -> T:
|
| 86 | assert len(o.expr) == 1, o.expr
|
| 87 | expr = o.expr[0]
|
| 88 | assert isinstance(expr, CallExpr), expr
|
| 89 | self.accept(expr)
|
| 90 | self.accept(o.body)
|
| 91 |
|
| 92 | def visit_func_def(self, o: 'mypy.nodes.FuncDef') -> T:
|
| 93 | if o.name == '__repr__': # Don't translate
|
| 94 | return
|
| 95 |
|
| 96 | for arg in o.arguments:
|
| 97 | if arg.initializer:
|
| 98 | self.accept(arg.initializer)
|
| 99 |
|
| 100 | self.accept(o.body)
|
| 101 |
|
| 102 | def visit_class_def(self, o: 'mypy.nodes.ClassDef') -> T:
|
| 103 | self.current_class_name = split_py_name(o.fullname)
|
| 104 | for stmt in o.defs.body:
|
| 105 | self.accept(stmt)
|
| 106 | self.current_class_name = None
|
| 107 |
|
| 108 | # Statements
|
| 109 |
|
| 110 | def visit_assignment_stmt(self, o: 'mypy.nodes.AssignmentStmt') -> T:
|
| 111 | for lval in o.lvalues:
|
| 112 | self.accept(lval)
|
| 113 |
|
| 114 | self.accept(o.rvalue)
|
| 115 |
|
| 116 | def visit_operator_assignment_stmt(
|
| 117 | self, o: 'mypy.nodes.OperatorAssignmentStmt') -> T:
|
| 118 | self.accept(o.lvalue)
|
| 119 | self.accept(o.rvalue)
|
| 120 |
|
| 121 | def visit_block(self, block: 'mypy.nodes.Block') -> T:
|
| 122 | for stmt in block.body:
|
| 123 | # Ignore things that look like docstrings
|
| 124 | if (isinstance(stmt, ExpressionStmt) and
|
| 125 | isinstance(stmt.expr, StrExpr)):
|
| 126 | continue
|
| 127 |
|
| 128 | self.accept(stmt)
|
| 129 |
|
| 130 | def visit_expression_stmt(self, o: 'mypy.nodes.ExpressionStmt') -> T:
|
| 131 | self.accept(o.expr)
|
| 132 |
|
| 133 | def visit_while_stmt(self, o: 'mypy.nodes.WhileStmt') -> T:
|
| 134 | self.accept(o.expr)
|
| 135 | self.accept(o.body)
|
| 136 |
|
| 137 | def visit_return_stmt(self, o: 'mypy.nodes.ReturnStmt') -> T:
|
| 138 | if o.expr:
|
| 139 | self.accept(o.expr)
|
| 140 |
|
| 141 | def visit_if_stmt(self, o: 'mypy.nodes.IfStmt') -> T:
|
| 142 | # Omit if TYPE_CHECKING blocks. They contain type expressions that
|
| 143 | # don't type check!
|
| 144 | cond = o.expr[0]
|
| 145 | if isinstance(cond, NameExpr) and cond.name == 'TYPE_CHECKING':
|
| 146 | return
|
| 147 |
|
| 148 | for expr in o.expr:
|
| 149 | self.accept(expr)
|
| 150 |
|
| 151 | for body in o.body:
|
| 152 | self.accept(body)
|
| 153 |
|
| 154 | if o.else_body:
|
| 155 | self.accept(o.else_body)
|
| 156 |
|
| 157 | def visit_raise_stmt(self, o: 'mypy.nodes.RaiseStmt') -> T:
|
| 158 | if o.expr:
|
| 159 | self.accept(o.expr)
|
| 160 |
|
| 161 | def visit_try_stmt(self, o: 'mypy.nodes.TryStmt') -> T:
|
| 162 | self.accept(o.body)
|
| 163 | for handler in o.handlers:
|
| 164 | self.accept(handler)
|
| 165 |
|
| 166 | def visit_del_stmt(self, o: 'mypy.nodes.DelStmt') -> T:
|
| 167 | self.accept(o.expr)
|
| 168 |
|
| 169 | # Expressions
|
| 170 |
|
| 171 | def visit_generator_expr(self, o: 'mypy.nodes.GeneratorExpr') -> T:
|
| 172 | self.accept(o.left_expr)
|
| 173 |
|
| 174 | for expr in o.indices:
|
| 175 | self.accept(expr)
|
| 176 |
|
| 177 | for expr in o.sequences:
|
| 178 | self.accept(expr)
|
| 179 |
|
| 180 | for l in o.condlists:
|
| 181 | for expr in l:
|
| 182 | self.accept(expr)
|
| 183 |
|
| 184 | def visit_list_comprehension(self, o: 'mypy.nodes.ListComprehension') -> T:
|
| 185 | self.accept(o.generator)
|
| 186 |
|
| 187 | def visit_member_expr(self, o: 'mypy.nodes.MemberExpr') -> T:
|
| 188 | self.accept(o.expr)
|
| 189 |
|
| 190 | def visit_yield_expr(self, o: 'mypy.nodes.YieldExpr') -> T:
|
| 191 | self.accept(o.expr)
|
| 192 |
|
| 193 | def visit_op_expr(self, o: 'mypy.nodes.OpExpr') -> T:
|
| 194 | self.accept(o.left)
|
| 195 | self.accept(o.right)
|
| 196 |
|
| 197 | def visit_comparison_expr(self, o: 'mypy.nodes.ComparisonExpr') -> T:
|
| 198 | for operand in o.operands:
|
| 199 | self.accept(operand)
|
| 200 |
|
| 201 | def visit_unary_expr(self, o: 'mypy.nodes.UnaryExpr') -> T:
|
| 202 | self.accept(o.expr)
|
| 203 |
|
| 204 | def visit_list_expr(self, o: 'mypy.nodes.ListExpr') -> T:
|
| 205 | if o.items:
|
| 206 | for item in o.items:
|
| 207 | self.accept(item)
|
| 208 |
|
| 209 | def visit_dict_expr(self, o: 'mypy.nodes.DictExpr') -> T:
|
| 210 | if o.items:
|
| 211 | for k, v in o.items:
|
| 212 | self.accept(k)
|
| 213 | self.accept(v)
|
| 214 |
|
| 215 | def visit_tuple_expr(self, o: 'mypy.nodes.TupleExpr') -> T:
|
| 216 | if o.items:
|
| 217 | for item in o.items:
|
| 218 | self.accept(item)
|
| 219 |
|
| 220 | def visit_index_expr(self, o: 'mypy.nodes.IndexExpr') -> T:
|
| 221 | self.accept(o.base)
|
| 222 | self.accept(o.index)
|
| 223 |
|
| 224 | def visit_slice_expr(self, o: 'mypy.nodes.SliceExpr') -> T:
|
| 225 | if o.begin_index:
|
| 226 | self.accept(o.begin_index)
|
| 227 |
|
| 228 | if o.end_index:
|
| 229 | self.accept(o.end_index)
|
| 230 |
|
| 231 | if o.stride:
|
| 232 | self.accept(o.stride)
|
| 233 |
|
| 234 | def visit_conditional_expr(self, o: 'mypy.nodes.ConditionalExpr') -> T:
|
| 235 | self.accept(o.cond)
|
| 236 | self.accept(o.if_expr)
|
| 237 | self.accept(o.else_expr)
|
| 238 |
|
| 239 | def visit_call_expr(self, o: 'mypy.nodes.CallExpr') -> T:
|
| 240 | self.accept(o.callee)
|
| 241 | for arg in o.args:
|
| 242 | self.accept(arg)
|