parse.py

Mon, 24 Jun 2019 01:13:02 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Mon, 24 Jun 2019 01:13:02 +0300
changeset 87
90105119ff90
parent 69
a24c4490d9f2
child 94
109fb7cf658f
permissions
-rw-r--r--

added a test for non-standard whitespace characters in the description

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

mercurial