bitwikiorg from dataclasses import dataclass import json import sys
Script to check that the fields.json file that Claude creates when analyzing PDFs
does not have overlapping bounding boxes. See forms.md.
@dataclass class RectAndField: rect: list[float] rect_type: str field: dict
Returns a list of messages that are printed to stdout for Claude to read.
def get_bounding_box_messages(fields_json_stream) -> list[str]: messages = [] fields = json.load(fields_json_stream) messages.append(f"Read {len(fields['form_fields'])} fields")
def rects_intersect(r1, r2):
disjoint_horizontal = r1[0] >= r2[2] or r1[2] <= r2[0]
disjoint_vertical = r1[1] >= r2[3] or r1[3] <= r2[1]
return not (disjoint_horizontal or disjoint_vertical)
rects_and_fields = []
for f in fields["form_fields"]:
rects_and_fields.append(RectAndField(f["label_bounding_box"], "label", f))
rects_and_fields.append(RectAndField(f["entry_bounding_box"], "entry", f))
has_error = False
for i, ri in enumerate(rects_and_fields):
# This is O(N^2); we can optimize if it becomes a problem.
for j in range(i + 1, len(rects_and_fields)):
rj = rects_and_fields[j]
if ri.field["page_number"] == rj.field["page_number"] and rects_intersect(ri.rect, rj.rect):
has_error = True
if ri.field is rj.field:
messages.append(f"FAILURE: intersection between label and entry bounding boxes for `{ri.field['description']}` ({ri.rect}, {rj.rect})")
else:
messages.append(f"FAILURE: intersection between {ri.rect_type} bounding box for `{ri.field['description']}` ({ri.rect}) and {rj.rect_type} bounding box for `{rj.field['description']}` ({rj.rect})")
if len(messages) >= 20:
messages.append("Aborting further checks; fix bounding boxes and try again")
return messages
if ri.rect_type == "entry":
if "entry_text" in ri.field:
font_size = ri.field["entry_text"].get("font_size", 14)
entry_height = ri.rect[3] - ri.rect[1]
if entry_height < font_size:
has_error = True
messages.append(f"FAILURE: entry bounding box height ({entry_height}) for `{ri.field['description']}` is too short for the text content (font size: {font_size}). Increase the box height or decrease the font size.")
if len(messages) >= 20:
messages.append("Aborting further checks; fix bounding boxes and try again")
return messages
if not has_error:
messages.append("SUCCESS: All bounding boxes are valid")
return messages
if name == "main":
if len(sys.argv) != 2:
print("Usage: check_bounding_boxes.py [fields.json]")
sys.exit(1)
# Input file should be in the fields.json format described in forms.md.
with open(sys.argv[1]) as f:
messages = get_bounding_box_messages(f)
for msg in messages:
print(msg)