LordBaryhobal
052339ad3a
refactored the messy AST printer impletation with Claude to use a context manager, an enum and extract common functions Co-authored-by: Claude <noreply@anthropic.com>
123 lines
3.8 KiB
Python
123 lines
3.8 KiB
Python
from contextlib import contextmanager
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from enum import Enum, auto
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import io
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from typing import Generator, Optional
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from core.ast.annotations import Expr, TypeExpr, SchemaExpr, SchemaElementExpr
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class _Level(Enum):
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EMPTY = auto()
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ACTIVE = auto()
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LAST = auto()
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class AnnotationAstPrinter(Expr.Visitor[None]):
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LAST_CHILD = "└── "
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CHILD = "├── "
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VERTICAL = "│ "
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EMPTY = " "
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def __init__(self):
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self._levels: list[_Level] = []
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self._idx: Optional[int] = None
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self._buf: io.StringIO = io.StringIO()
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def print(self, expr: Expr):
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self._buf = io.StringIO()
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expr.accept(self)
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return self._buf.getvalue()
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@contextmanager
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def _child_level(self, last: bool = False) -> Generator[None, None, None]:
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self._levels.append(_Level.LAST if last else _Level.ACTIVE)
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try:
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yield
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finally:
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self._levels.pop()
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def _mark_last(self):
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if self._levels:
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self._levels[-1] = _Level.LAST
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def _write_line(self, text: str):
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indent: str = self._build_indent()
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if self._idx is not None:
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text = f"[{self._idx}] {text}"
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self._idx = None
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self._buf.write(indent + text + "\n")
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def _build_indent(self) -> str:
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parts: list[str] = []
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for level in self._levels[:-1]:
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parts.append(self.EMPTY if level == _Level.EMPTY else self.VERTICAL)
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if self._levels:
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if self._levels[-1] == _Level.LAST:
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parts.append(self.LAST_CHILD)
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self._levels[-1] = _Level.EMPTY
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else:
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parts.append(self.CHILD)
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return "".join(parts)
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def _write_optional_child(
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self, label: str, child: Optional[Expr], *, last: bool = False
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):
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if last:
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self._mark_last()
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if child is None:
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self._write_line(f"{label}: None")
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else:
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self._write_line(label)
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with self._child_level(last=True):
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child.accept(self)
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def visit_type_expr(self, expr: TypeExpr):
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self._write_line("TypeExpr")
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with self._child_level():
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self._write_line(f'name: "{expr.name.lexeme}"')
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self._write_optional_child("schema", expr.schema, last=True)
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def visit_schema_expr(self, expr: SchemaExpr):
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self._write_line("SchemaExpr")
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with self._child_level():
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for i, elmt in enumerate(expr.elements):
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self._idx = i
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if i == len(expr.elements) - 1:
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self._mark_last()
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elmt.accept(self)
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def visit_schema_element_expr(self, expr: SchemaElementExpr):
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self._write_line("SchemaElementExpr")
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with self._child_level():
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name_text: str = "None" if expr.name is None else f'"{expr.name.lexeme}"'
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self._write_line(f"name: {name_text}")
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self._write_optional_child("type", expr.type, last=True)
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class AnnotationPrinter(Expr.Visitor[str]):
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def print(self, expr: Expr):
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return expr.accept(self)
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def visit_type_expr(self, expr: TypeExpr) -> str:
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schema: str = ""
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if expr.schema is not None:
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schema = expr.schema.accept(self)
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return f"{expr.name.lexeme}{schema}"
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def visit_schema_expr(self, expr: SchemaExpr) -> str:
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res: str = expr.left.lexeme
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res += ", ".join(elmt.accept(self) for elmt in expr.elements)
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res += expr.right.lexeme
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return res
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def visit_schema_element_expr(self, expr: SchemaElementExpr) -> str:
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parts: list[str] = []
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if expr.name is not None:
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parts.append(expr.name.lexeme)
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if expr.type is None:
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parts.append("_")
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else:
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parts.append(expr.type.accept(self))
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return ": ".join(parts)
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