parse.py

Thu, 26 Aug 2021 19:37:00 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Thu, 26 Aug 2021 19:37:00 +0300
changeset 148
8f621aa4cfd7
parent 145
fde18c4d6784
permissions
-rw-r--r--

Update license year

2
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1 import linetypes
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2 import re
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3 from geometry import *
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4 from colours import Colour
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5 import header
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6
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7 class BadLdrawLine(Exception):
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8 pass
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9
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10 class Model:
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11 def __init__(
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12 self, header, body, *, context, \
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13 header_size = 0, line_ending_errors = None
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14 ):
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15 self.header = header
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16 self.body = body
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17 self.header_size = header_size
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18 self.context = context # contains stuff like library paths
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19 self.line_ending_errors = line_ending_errors
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20 def filter_by_type(self, type):
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21 yield from [
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22 element
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23 for element in self.body
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24 if isinstance(element, type)
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25 ]
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26 @property
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27 def subfile_references(self):
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28 yield from self.filter_by_type(linetypes.SubfileReference)
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29 @property
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30 def line_segments(self):
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31 yield from self.filter_by_type(linetypes.LineSegment)
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32 @property
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33 def triangles(self):
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34 yield from self.filter_by_type(linetypes.Triangle)
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35 @property
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36 def quadrilaterals(self):
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37 yield from self.filter_by_type(linetypes.Quadrilateral)
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38 @property
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39 def has_header(self):
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40 return self.header and not isinstance(self.header, header.BadHeader)
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41 def find_first_header_object(self, object_type):
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42 return self.find_header_object(object_type, 0)
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43 def find_header_object(self, object_type, n):
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44 try:
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45 return self.body[self.header.occurrences[object_type][n]]
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46 except IndexError:
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47 raise KeyError(str.format(
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48 '{type} not found in header',
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49 type = object_type
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50 ))
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51
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52 def model_vertices(
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53 model,
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54 transformation_matrix = None,
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55 file_cache = None,
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56 ):
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57 if transformation_matrix is None:
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58 transformation_matrix = complete_matrix(Matrix3x3(), Vertex(0, 0, 0))
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59 if file_cache is None:
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60 import filecache
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61 file_cache = filecache.SubfileCache(ldraw_directories = model.context.libraries)
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62 for element in model.body:
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63 if isinstance(element, linetypes.BasePolygon):
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64 for point in element.geometry.vertices:
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65 yield point @ transformation_matrix
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66 if isinstance(element, linetypes.ConditionalLine):
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67 for point in element.control_points:
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68 yield point @ transformation_matrix
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69 if isinstance(element, linetypes.SubfileReference):
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70 subfile = file_cache.prepare_file(element.subfile_path)
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71 for point in subfile.vertices:
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72 matrix_4x4 = complete_matrix(element.matrix, element.anchor)
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73 point @= matrix_4x4
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74 yield point @ transformation_matrix
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75
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76 def read_ldraw(file, *, context, name = ''):
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77 line_ending_errors = {
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78 'count': 0,
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79 'first-at': None,
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80 }
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81 model_body = []
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82 for i, line in enumerate(file.readlines()):
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83 # check line endings
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84 if not line.endswith(b'\r\n'):
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85 if line_ending_errors['first-at'] is None:
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86 line_ending_errors['first-at'] = i
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87 line_ending_errors['count'] += 1
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88 model_body.append(parse_ldraw_code(line))
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89 if line_ending_errors['count'] == 0:
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90 line_ending_errors = None
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91 headerparser = header.HeaderParser()
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92 try:
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93 header_parse_result = headerparser.parse(model_body)
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94 header_object = header_parse_result['header']
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95 end = header_parse_result['end-index']
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96 except header.HeaderError as error:
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97 header_object = header.BadHeader(error.index, error.reason)
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98 end = 0
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99 model = Model(
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100 header = header_object,
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101 body = model_body,
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102 header_size = end,
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103 context = context,
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104 line_ending_errors = line_ending_errors,
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105 )
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106 model.name = name
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107 return model
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108
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109 def parse_ldraw_code(line):
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110 try:
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111 if isinstance(line, bytes):
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112 line = line.decode()
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113 line = line.strip()
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114 if not line:
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115 return linetypes.EmptyLine()
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116 elif line == '0':
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117 return linetypes.MetaCommand('')
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118 elif line.startswith('0 '):
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119 return parse_ldraw_meta_line(line)
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120 elif line.startswith('1 '):
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121 return parse_ldraw_subfile_reference(line)
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122 elif line.startswith('2 '):
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123 return parse_ldraw_line(line)
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124 elif line.startswith('3 '):
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125 return parse_ldraw_triangle(line)
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126 elif line.startswith('4 '):
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127 return parse_ldraw_quadrilateral(line)
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128 elif line.startswith('5 '):
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129 return parse_ldraw_conditional_line(line)
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130 else:
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131 raise BadLdrawLine('unknown line type')
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132 except BadLdrawLine as error:
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133 return linetypes.Error(line, str(error))
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134
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135 def parse_ldraw_meta_line(line):
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136 if line.startswith('0 //'):
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137 return linetypes.Comment(line[4:])
2
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138 else:
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139 return linetypes.MetaCommand(line[2:])
2
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140
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141 def parse_ldraw_subfile_reference(line):
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142 pattern = r'^1\s+([^ ]+)' + r'\s+([^ ]+)' * (3 + 9 + 1) + r'\s*$'
2
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143 match = re.search(pattern, line)
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144 if not match:
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145 raise BadLdrawLine('unable to parse')
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146 groups = list(match.groups())
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147 indices = {
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148 'colour_index': 0,
2
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149 'anchor': slice(1, 4),
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150 'matrix': slice(4, 13),
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151 'subfile_path': 13
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152 }
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153 try:
4
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154 colour = Colour(groups[indices['colour_index']])
2
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155 vertex_values = [float(x) for x in groups[indices['anchor']]]
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156 matrix_values = [float(x) for x in groups[indices['matrix']]]
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157 except ValueError:
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158 raise BadLdrawLine('bad numeric values')
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159 return linetypes.SubfileReference(
4
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160 colour = colour,
2
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161 anchor = Vertex(*vertex_values),
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6da1e81c5652 Added code to compute areas of triangles and quadrilaterals
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162 matrix = Matrix3x3(matrix_values),
2
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163 subfile_path = groups[indices['subfile_path']]
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parents:
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164 )
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165
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166 def generic_parse_polygon(line, *, type_code, vertex_count):
35
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167 pattern = r'^' # matches the start of line
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168 pattern += str(type_code) # matches the type code
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169 pattern += '\s+([^ ]+)' # matches the colour
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170 pattern += r'\s+([^ ]+)' * (vertex_count * 3) # matches the vertices
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171 pattern += r'\s*$' # matches any trailing space
2
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172 match = re.search(pattern, line)
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parents:
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173 if not match:
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parents:
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174 raise BadLdrawLine(str.format('cannot parse type-{} line', type_code))
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175 vertices = []
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parents:
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176 for vertex_index in range(vertex_count):
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parents:
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177 slice_begin = 1 + vertex_index * 3
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parents:
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178 slice_end = 1 + (vertex_index + 1) * 3
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parents:
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179 coordinates = match.groups()[slice_begin:slice_end]
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parents:
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180 assert(len(coordinates) == 3)
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parents:
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181 try:
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parents:
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182 coordinates = [float(x) for x in coordinates]
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parents:
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183 except ValueError:
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parents:
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184 raise BadLdrawLine('bad numeric values')
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parents:
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185 vertices.append(Vertex(*coordinates))
38
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parents: 35
diff changeset
186 try:
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187 colour = int(match.group(1), 0)
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188 except ValueError:
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parents: 35
diff changeset
189 raise BadLdrawLine('invalid syntax for colour: ' + repr(match.group(1)))
2
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Santeri Piippo
parents:
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190 return {
38
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parents: 35
diff changeset
191 'colour': Colour(colour),
2
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parents:
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192 'vertices': vertices,
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Santeri Piippo
parents:
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193 }
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Santeri Piippo
parents:
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194
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parents:
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195 def parse_ldraw_line(line):
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parents:
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196 parse_result = generic_parse_polygon(line, type_code = 2, vertex_count = 2)
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parents:
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197 return linetypes.LineSegment(
4
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parents: 3
diff changeset
198 colour = parse_result['colour'],
2
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parents:
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199 geometry = LineSegment(*parse_result['vertices']),
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parents:
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200 )
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Santeri Piippo
parents:
diff changeset
201
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
202 def parse_ldraw_triangle(line):
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parents:
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203 parse_result = generic_parse_polygon(line, type_code = 3, vertex_count = 3)
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parents:
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204 return linetypes.Triangle(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
205 colour = parse_result['colour'],
2
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Santeri Piippo
parents:
diff changeset
206 geometry = Polygon(parse_result['vertices']),
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Santeri Piippo
parents:
diff changeset
207 )
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Santeri Piippo
parents:
diff changeset
208
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
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209 def parse_ldraw_quadrilateral(line):
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Santeri Piippo
parents:
diff changeset
210 parse_result = generic_parse_polygon(line, type_code = 4, vertex_count = 4)
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Santeri Piippo
parents:
diff changeset
211 return linetypes.Quadrilateral(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
212 colour = parse_result['colour'],
2
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Santeri Piippo
parents:
diff changeset
213 geometry = Polygon(parse_result['vertices']),
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Santeri Piippo
parents:
diff changeset
214 )
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Santeri Piippo
parents:
diff changeset
215
35
865cd526e8b6 cleanup
Teemu Piippo <teemu@hecknology.net>
parents: 29
diff changeset
216 def parse_ldraw_conditional_line(line):
2
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
217 parse_result = generic_parse_polygon(line, type_code = 5, vertex_count = 4)
35
865cd526e8b6 cleanup
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parents: 29
diff changeset
218 return linetypes.ConditionalLine(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
219 colour = parse_result['colour'],
2
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
220 geometry = LineSegment(*parse_result['vertices'][0:2]),
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parents:
diff changeset
221 control_points = parse_result['vertices'][2:],
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Santeri Piippo
parents:
diff changeset
222 )

mercurial