ldverify.py

#!/usr/bin/env python3
from sys import version_info
if version_info < (3, 4):
    raise RuntimeError('Python 3.4 or newer required')

from parse import parse_ldraw_code
from colours import load_colours
from geometry import *
from pathlib import Path

def read_ldraw(file, *, libraries):
    result = list()
    for line in file:
        result.append(parse_ldraw_code(line))
    return result

def find_ldconfig_ldr_paths(libraries):
    for library in libraries:
        ldconfig_paths = [
            library['path'] / 'LDConfig.ldr',
            library['path'] / 'ldconfig.ldr',
        ]
        for path in ldconfig_paths:
            if path.is_file():
                yield path

def hairline_score(smallest_angle):
    from math import log10
    return max(0, -log10(smallest_angle))

if __name__ == '__main__':
    from sys import argv
    libraries = [{'path': Path('~/ldraw').expanduser(), 'role': 'official'}]
    for ldconfig_ldr_path in find_ldconfig_ldr_paths(libraries):
        with ldconfig_ldr_path.open() as ldconfig_ldr:
            load_colours(ldconfig_ldr)
    with open(argv[1], 'r') as file:
        model = read_ldraw(file, libraries = libraries)
        for line_number, entry in enumerate(model, 1):
            if hasattr(entry, 'colour'):
                print(repr(entry.colour))
            if hasattr(entry, 'geometry') and len(entry.geometry) >= 3:
                if hairline_score(entry.geometry.smallest_angle) >= 2.0:
                    print(str.format(
                        'Hairline {type} at line {line_number}',
                        type = entry.typename(),
                        line_number = line_number,
                    ))
                    print(entry.textual_representation())
                    print('-' * 25)