parse.py

Mon, 24 Jun 2019 19:08:24 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Mon, 24 Jun 2019 19:08:24 +0300
changeset 94
109fb7cf658f
parent 69
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child 101
745f2c3aec0a
permissions
-rw-r--r--

added a check for non-DOS line endings

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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, *, ldraw_directories, \
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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.ldraw_directories = ldraw_directories
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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.body[self.header.first_occurrence[object_type]]
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43
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44 def model_vertices(
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45 model,
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46 transformation_matrix = None,
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47 file_cache = None,
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48 ):
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49 if transformation_matrix is None:
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50 transformation_matrix = complete_matrix(Matrix3x3(), Vertex(0, 0, 0))
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51 if file_cache is None:
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52 import filecache
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53 file_cache = filecache.SubfileCache(model.ldraw_directories)
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54 for element in model.body:
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55 if isinstance(element, linetypes.BasePolygon):
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56 for point in element.geometry.vertices:
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57 yield point @ transformation_matrix
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58 if isinstance(element, linetypes.ConditionalLine):
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59 for point in element.control_points:
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60 yield point @ transformation_matrix
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61 if isinstance(element, linetypes.SubfileReference):
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62 subfile = file_cache.prepare_file(element.subfile_path)
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63 for point in subfile.vertices:
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64 matrix_4x4 = complete_matrix(element.matrix, element.anchor)
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65 point @= matrix_4x4
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66 yield point @ transformation_matrix
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67
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68 def read_ldraw(file, *, ldraw_directories, name = ''):
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69 line_ending_errors = {
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70 'count': 0,
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71 'first-at': None,
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72 }
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73 model_body = []
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74 for i, line in enumerate(file.readlines()):
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75 # check line endings
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76 if not line.endswith(b'\r\n'):
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77 if line_ending_errors['first-at'] is None:
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78 line_ending_errors['first-at'] = i
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79 line_ending_errors['count'] += 1
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80 model_body.append(parse_ldraw_code(line))
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81 if line_ending_errors['count'] == 0:
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82 line_ending_errors = None
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83 headerparser = header.HeaderParser()
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84 try:
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85 header_parse_result = headerparser.parse(model_body)
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86 header_object = header_parse_result['header']
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87 end = header_parse_result['end-index']
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88 except header.HeaderError as error:
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89 header_object = header.BadHeader(error.index, error.reason)
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90 end = 0
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91 model = Model(
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92 header = header_object,
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93 body = model_body,
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94 header_size = end,
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95 ldraw_directories = ldraw_directories,
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96 line_ending_errors = line_ending_errors,
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97 )
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98 model.name = name
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99 return model
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100
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101 def parse_ldraw_code(line):
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102 try:
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103 if isinstance(line, bytes):
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104 line = line.decode()
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105 line = line.strip()
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106 if not line:
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107 return linetypes.EmptyLine()
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108 elif line == '0':
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109 return linetypes.MetaCommand('')
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110 elif line.startswith('0 '):
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111 return parse_ldraw_meta_line(line)
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112 elif line.startswith('1 '):
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113 return parse_ldraw_subfile_reference(line)
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114 elif line.startswith('2 '):
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115 return parse_ldraw_line(line)
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116 elif line.startswith('3 '):
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117 return parse_ldraw_triangle(line)
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118 elif line.startswith('4 '):
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119 return parse_ldraw_quadrilateral(line)
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120 elif line.startswith('5 '):
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121 return parse_ldraw_conditional_line(line)
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122 else:
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123 raise BadLdrawLine('unknown line type')
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124 except BadLdrawLine as error:
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125 return linetypes.Error(line, str(error))
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126
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127 def parse_ldraw_meta_line(line):
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128 if line.startswith('0 //'):
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129 return linetypes.Comment(line[4:])
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130 else:
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131 return linetypes.MetaCommand(line[2:])
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132
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133 def parse_ldraw_subfile_reference(line):
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134 pattern = r'^1\s+([^ ]+)' + r'\s+([^ ]+)' * (3 + 9 + 1) + r'\s*$'
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135 match = re.search(pattern, line)
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136 if not match:
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137 raise BadLdrawLine('unable to parse')
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138 groups = list(match.groups())
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139 indices = {
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8eb83f200486 color -> colour
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140 'colour_index': 0,
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141 'anchor': slice(1, 4),
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parents:
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142 'matrix': slice(4, 13),
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parents:
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143 'subfile_path': 13
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parents:
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144 }
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parents:
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145 try:
4
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parents: 3
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146 colour = Colour(groups[indices['colour_index']])
2
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parents:
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147 vertex_values = [float(x) for x in groups[indices['anchor']]]
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148 matrix_values = [float(x) for x in groups[indices['matrix']]]
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parents:
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149 except ValueError:
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parents:
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150 raise BadLdrawLine('bad numeric values')
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parents:
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151 return linetypes.SubfileReference(
4
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parents: 3
diff changeset
152 colour = colour,
2
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parents:
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153 anchor = Vertex(*vertex_values),
6
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parents: 4
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154 matrix = Matrix3x3(matrix_values),
2
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parents:
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155 subfile_path = groups[indices['subfile_path']]
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parents:
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156 )
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Santeri Piippo
parents:
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157
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Santeri Piippo
parents:
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158 def generic_parse_polygon(line, *, type_code, vertex_count):
35
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parents: 29
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159 pattern = r'^' # matches the start of line
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parents: 29
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160 pattern += str(type_code) # matches the type code
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parents: 29
diff changeset
161 pattern += '\s+([^ ]+)' # matches the colour
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parents: 29
diff changeset
162 pattern += r'\s+([^ ]+)' * (vertex_count * 3) # matches the vertices
865cd526e8b6 cleanup
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parents: 29
diff changeset
163 pattern += r'\s*$' # matches any trailing space
2
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parents:
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164 match = re.search(pattern, line)
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parents:
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165 if not match:
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parents:
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166 raise BadLdrawLine(str.format('cannot parse type-{} line', type_code))
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parents:
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167 vertices = []
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parents:
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168 for vertex_index in range(vertex_count):
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parents:
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169 slice_begin = 1 + vertex_index * 3
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parents:
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170 slice_end = 1 + (vertex_index + 1) * 3
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parents:
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171 coordinates = match.groups()[slice_begin:slice_end]
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parents:
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172 assert(len(coordinates) == 3)
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Santeri Piippo
parents:
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173 try:
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parents:
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174 coordinates = [float(x) for x in coordinates]
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parents:
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175 except ValueError:
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Santeri Piippo
parents:
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176 raise BadLdrawLine('bad numeric values')
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parents:
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177 vertices.append(Vertex(*coordinates))
38
66c9591b733d added proper handling of syntax errors
Teemu Piippo <teemu@hecknology.net>
parents: 35
diff changeset
178 try:
66c9591b733d added proper handling of syntax errors
Teemu Piippo <teemu@hecknology.net>
parents: 35
diff changeset
179 colour = int(match.group(1), 0)
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Teemu Piippo <teemu@hecknology.net>
parents: 35
diff changeset
180 except ValueError:
66c9591b733d added proper handling of syntax errors
Teemu Piippo <teemu@hecknology.net>
parents: 35
diff changeset
181 raise BadLdrawLine('invalid syntax for colour: ' + repr(match.group(1)))
2
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Santeri Piippo
parents:
diff changeset
182 return {
38
66c9591b733d added proper handling of syntax errors
Teemu Piippo <teemu@hecknology.net>
parents: 35
diff changeset
183 'colour': Colour(colour),
2
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Santeri Piippo
parents:
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184 'vertices': vertices,
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Santeri Piippo
parents:
diff changeset
185 }
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Santeri Piippo
parents:
diff changeset
186
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Santeri Piippo
parents:
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187 def parse_ldraw_line(line):
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Santeri Piippo
parents:
diff changeset
188 parse_result = generic_parse_polygon(line, type_code = 2, vertex_count = 2)
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Santeri Piippo
parents:
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189 return linetypes.LineSegment(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
190 colour = parse_result['colour'],
2
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Santeri Piippo
parents:
diff changeset
191 geometry = LineSegment(*parse_result['vertices']),
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Santeri Piippo
parents:
diff changeset
192 )
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Santeri Piippo
parents:
diff changeset
193
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
194 def parse_ldraw_triangle(line):
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Santeri Piippo
parents:
diff changeset
195 parse_result = generic_parse_polygon(line, type_code = 3, vertex_count = 3)
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Santeri Piippo
parents:
diff changeset
196 return linetypes.Triangle(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
197 colour = parse_result['colour'],
2
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Santeri Piippo
parents:
diff changeset
198 geometry = Polygon(parse_result['vertices']),
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Santeri Piippo
parents:
diff changeset
199 )
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Santeri Piippo
parents:
diff changeset
200
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Santeri Piippo
parents:
diff changeset
201 def parse_ldraw_quadrilateral(line):
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Santeri Piippo
parents:
diff changeset
202 parse_result = generic_parse_polygon(line, type_code = 4, vertex_count = 4)
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
203 return linetypes.Quadrilateral(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
204 colour = parse_result['colour'],
2
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
205 geometry = Polygon(parse_result['vertices']),
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
206 )
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
207
35
865cd526e8b6 cleanup
Teemu Piippo <teemu@hecknology.net>
parents: 29
diff changeset
208 def parse_ldraw_conditional_line(line):
2
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
209 parse_result = generic_parse_polygon(line, type_code = 5, vertex_count = 4)
35
865cd526e8b6 cleanup
Teemu Piippo <teemu@hecknology.net>
parents: 29
diff changeset
210 return linetypes.ConditionalLine(
4
8eb83f200486 color -> colour
Santeri Piippo
parents: 3
diff changeset
211 colour = parse_result['colour'],
2
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
212 geometry = LineSegment(*parse_result['vertices'][0:2]),
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
213 control_points = parse_result['vertices'][2:],
50d3086070df Moved the parsing function into a new file
Santeri Piippo
parents:
diff changeset
214 )

mercurial