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autocad-mcp-pro/engineering/validator.py
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Umutcan Edizsalan 32a68be919 fix: correctness, cross-backend parity & enforced quality gate (audit Sprints 2-4)
Audit-driven fixes across the dual backend, the premium workflow, and the
engineering layer. 318 tests, ruff-clean.

Quality gate (the moat):
- drawing_finalize now runs the premium ISO-128 critique in addition to the
  8-step validator; leftover construction, non-ISO lineweights, untrimmed
  corners, duplicates and dim overlap block the gate (strict_critique fails on
  warnings too).
- dim_overlap critique no longer a no-op (dim reference point + bbox fallback);
  dim/construction layers resolve from the active layer set (iso13567 too).

Stability / correctness:
- view_screenshot & drawing_export_pdf render headless via Agg (no more
  worker-thread SIGSEGV).
- gear tooth profile no longer self-overlaps at high tooth counts; section view
  no longer duplicates bore lines; validator keyway heuristic fixed.
- ezdxf aligned/angular dim API, full-circle polar array duplicate already
  covered by Sprint 1; this bundle adds save-format-from-extension,
  entity_offset side selection, ARC length, properties parity (bounding_box /
  rotation / char_height), mtext rotation.

COM robustness (mocked-COM tested):
- CoUninitialize on teardown; transaction commit/rollback try/finally + UNDO via
  the CMDACTIVE guard; system_run_lisp guard + USERS1 value capture;
  set_variable type coercion; HWND via Application.HWND; BlockInfo.description.

Security:
- HTTP remote-bind guard fires on every launch path (incl. `fastmcp run`);
  StaticTokenVerifier wired into FastMCP; AutoLISP allowlist bypass-vector tests.

Hygiene: linetype-on-demand in _apply_attrs, honest view_zoom returns, snap-on-arc
sweep handling, point_tangent acos clamp, dynamic tool_groups / tool count,
word-boundary SPUR/HELICAL, undo-stack locking.

Deferred: R22 (undo/transaction stack isolation) lands with the I1 refiner (1.2),
which depends on it.
2026-06-19 08:36:58 +03:00

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"""8-step pre-completion validator for engineering drawings."""
from __future__ import annotations
import re
from dataclasses import dataclass, field
from pathlib import Path
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from backends.base import AutoCADBackend
REAL_DIMENSION_TYPES = {
"DIMENSION", "DIMLINEAR", "DIMALIGNED", "DIMANGULAR",
"DIMRADIUS", "DIMDIAMETER", "DIMORDINATE",
}
# Patterns that suggest a TEXT/MTEXT entity is masquerading as a dimension.
DIMENSION_LIKE_TEXT = re.compile(
r"(Ø|⌀|∅|%%c|%%C|R\d|±|%%p|\d+\s*[×x]\s*\d+|\d+\.\d+\s*mm)",
re.IGNORECASE,
)
# R27 — match SPUR / HELICAL as whole words (not substrings of e.g.
# "SPURIOUS") when checking title/helix consistency.
_SPUR_RE = re.compile(r"\bSPUR\b", re.IGNORECASE)
_HELICAL_RE = re.compile(r"\bHELICAL\b", re.IGNORECASE)
# Layers that hold title-block text (scoped scan target for step 5).
_TITLE_LAYERS = {"TITLE", "TITLEBLOCK"}
@dataclass
class ValidationFinding:
"""One issue surfaced by the validator."""
severity: str # "error" | "warning" | "info"
code: str
message: str
detail: dict = field(default_factory=dict)
@dataclass
class ValidationResult:
"""Aggregate of validator findings."""
ok: bool
findings: list[ValidationFinding]
summary: dict
def to_dict(self) -> dict:
return {
"ok": self.ok,
"summary": self.summary,
"findings": [
{
"severity": f.severity,
"code": f.code,
"message": f.message,
"detail": f.detail,
}
for f in self.findings
],
}
class DrawingValidator:
"""8-step pre-completion validator."""
async def run(
self,
backend: AutoCADBackend,
*,
expected: dict | None = None,
) -> ValidationResult:
"""Run all 8 checks; return aggregate ValidationResult."""
findings: list[ValidationFinding] = []
expected = expected or {}
ents: list = []
# 1 — fake dimensions
try:
ents = await backend.entity_list(limit=10000)
text_likes = [
e for e in ents
if e.type in ("TEXT", "MTEXT")
and DIMENSION_LIKE_TEXT.search(
getattr(e, "properties", {}).get("text", "") or ""
)
]
real_dims = [e for e in ents if e.type in REAL_DIMENSION_TYPES]
if text_likes:
findings.append(ValidationFinding(
"warning",
"fake_dimension_text",
f"{len(text_likes)} TEXT/MTEXT entities look like dimensions "
"(Ø, ±, R, etc.) — use dimension_* tools instead",
{
"sample_handles": [t.handle for t in text_likes[:5]],
"real_dim_count": len(real_dims),
},
))
except Exception as exc:
findings.append(ValidationFinding(
"warning", "dim_check_failed", str(exc),
))
# 2 — hidden orphans
try:
hidden = [e for e in ents if not e.visible]
if hidden:
findings.append(ValidationFinding(
"error",
"hidden_orphans",
f"{len(hidden)} entities have visible=False — hide-fallback "
"is forbidden, use entity_delete",
{"sample_handles": [h.handle for h in hidden[:5]]},
))
except Exception:
pass
# 3 — linetypes
try:
lts = {x.lower() for x in await backend.linetype_list()}
missing = [lt for lt in ("center", "hidden", "phantom") if lt not in lts]
if missing:
findings.append(ValidationFinding(
"error",
"linetypes_missing",
f"Standard linetypes not loaded: {', '.join(missing).upper()}",
{"missing": missing},
))
except Exception as exc:
findings.append(ValidationFinding(
"warning", "linetype_check_failed", str(exc),
))
# 4 — gear views (heuristic, only if expected demands)
if expected.get("must_have_bore") or expected.get("must_have_keyway"):
bore_circles = [
e for e in ents
if e.type == "CIRCLE" and e.layer == "GEOMETRY"
]
if expected.get("must_have_bore") and len(bore_circles) < 1:
findings.append(ValidationFinding(
"error",
"bore_missing",
"Expected bore but no circle on GEOMETRY layer found",
))
# draw_keyed_bore emits the keyway notch as an OPEN 4-point polyline
# on GEOMETRY — requiring `closed` here made this a permanent
# false-negative. Match a small (3-6 point) polyline, open or closed.
keyway_polys = [
e for e in ents
if e.type in ("LWPOLYLINE", "POLYLINE")
and e.layer == "GEOMETRY"
and 3 <= len(e.properties.get("points", [])) <= 6
]
if expected.get("must_have_keyway") and len(keyway_polys) < 1:
findings.append(ValidationFinding(
"warning",
"keyway_section_unverified",
"Could not confirm keyway via heuristic "
"(small 3-6 point polyline on GEOMETRY)",
))
# 5 — title consistency
helix = expected.get("helix_angle")
if helix:
# R27 — scope the scan to title-block text where possible (TITLE /
# TITLEBLOCK layer); fall back to all TEXT-layer text if no title
# layer carries any text.
title_block_texts = [
e.properties.get("text", "") or ""
for e in ents
if e.type in ("TEXT", "MTEXT") and e.layer in _TITLE_LAYERS
]
if title_block_texts:
title_texts = title_block_texts
else:
title_texts = [
e.properties.get("text", "") or ""
for e in ents
if e.type in ("TEXT", "MTEXT") and e.layer == "TEXT"
]
joined = " | ".join(title_texts)
# R27 — whole-word matching so "SPURIOUS" no longer trips SPUR.
has_spur = bool(_SPUR_RE.search(joined))
has_helical = bool(_HELICAL_RE.search(joined))
if has_spur and has_helical:
findings.append(ValidationFinding(
"error",
"title_helical_spur",
"Title contains 'HELICAL SPUR GEAR' — invalid; use "
"'HELICAL GEAR' or 'SPUR GEAR'",
))
elif has_spur:
findings.append(ValidationFinding(
"error",
"title_says_spur_for_helical",
f"Title contains SPUR but part is helical (helix_angle={helix})",
{"sample": joined[:200]},
))
# 6 — saved to disk
try:
info = await backend.drawing_info()
saved_attr = getattr(info, "saved", None)
full_path = getattr(info, "full_path", "") or ""
if not saved_attr:
findings.append(ValidationFinding(
"error",
"not_saved",
"Drawing has unsaved changes — call drawing_save before finalize",
{"full_path": full_path},
))
elif full_path and not Path(full_path).exists():
findings.append(ValidationFinding(
"error",
"file_missing",
f"Drawing reports saved=True but file not on disk: {full_path}",
))
except Exception as exc:
findings.append(ValidationFinding(
"warning", "save_check_failed", str(exc),
))
# 7 — screenshot
try:
shot = await backend.view_screenshot()
if not shot:
findings.append(ValidationFinding(
"info",
"screenshot_unavailable",
"Screenshot returned no bytes (ezdxf needs matplotlib install)",
))
except Exception as exc:
findings.append(ValidationFinding(
"info", "screenshot_failed", str(exc),
))
# 8 — dwg path returned
try:
info = await backend.drawing_info()
if not getattr(info, "full_path", ""):
findings.append(ValidationFinding(
"warning",
"no_path",
"drawing_info.full_path is empty",
))
except Exception:
pass
summary = {
sev: sum(1 for f in findings if f.severity == sev)
for sev in ("error", "warning", "info")
}
return ValidationResult(
ok=summary["error"] == 0,
findings=findings,
summary=summary,
)