summaryrefslogtreecommitdiff
path: root/gerbonara/gerber/rs274x.py
blob: 607b8bcb419f5d7c4961a340cb25de46e18b55e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
#! /usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
# Copyright 2021 Jan Götte <code@jaseg.de>
# Modified from parser.py by Paulo Henrique Silva <ph.silva@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" This module provides an RS-274-X class and parser.
"""

import copy
import json
import os
import re
import sys
import math
import warnings
import functools
from pathlib import Path
from itertools import count, chain
from io import StringIO
import textwrap

from .gerber_statements import *
from .cam import CamFile, FileSettings
from .utils import sq_distance, rotate_point
from .aperture_macros.parse import ApertureMacro, GenericMacros
from . import graphic_primitives as gp
from . import graphic_objects as go
from . import apertures


def convert(value, src, dst):
        if src == dst or src is None or dst is None or value is None:
            return value
        elif dst == 'mm':
            return value * 25.4
        else:
            return value / 25.4

def points_close(a, b):
    if a == b:
        return True
    elif a is None or b is None:
        return False
    elif None in a or None in b:
        return False
    else:
        return math.isclose(a[0], b[0]) and math.isclose(a[1], b[1])

class Tag:
    def __init__(self, name, children=None, root=False, **attrs):
        self.name, self.attrs = name, attrs
        self.children = children or []
        self.root = root

    def __str__(self):
        prefix = '<?xml version="1.0" encoding="utf-8"?>\n' if self.root else ''
        opening = ' '.join([self.name] + [f'{key.replace("__", ":")}="{value}"' for key, value in self.attrs.items()])
        if self.children:
            children = '\n'.join(textwrap.indent(str(c), '  ') for c in self.children)
            return f'{prefix}<{opening}>\n{children}\n</{self.name}>'
        else:
            return f'{prefix}<{opening}/>'

class GerberFile(CamFile):
    """ A class representing a single gerber file

    The GerberFile class represents a single gerber file.
    """

    def __init__(self, filename=None):
        super(GerberFile, self).__init__(filename)
        self.apertures = []
        self.comments = []
        self.objects = []

    def to_svg(self, tag=Tag, margin=0, arg_unit='mm', svg_unit='mm', force_bounds=None, color='black'):

        if force_bounds is None:
            (min_x, min_y), (max_x, max_y) = self.bounding_box(svg_unit, default=((0, 0), (0, 0)))
            print('bounding box:', (min_x, min_y), (max_x, max_y))
        else:
            (min_x, min_y), (max_x, max_y) = force_bounds
            min_x = convert(min_x, arg_unit, svg_unit)
            min_y = convert(min_y, arg_unit, svg_unit)
            max_x = convert(max_x, arg_unit, svg_unit)
            max_y = convert(max_y, arg_unit, svg_unit)

        if margin:
            margin = convert(margin, arg_unit, svg_unit)
            min_x -= margin
            min_y -= margin
            max_x += margin
            max_y += margin

        w, h = max_x - min_x, max_y - min_y
        w = 1.0 if math.isclose(w, 0.0) else w
        h = 1.0 if math.isclose(h, 0.0) else h

        primitives = [ prim.to_svg(tag, color) for obj in self.objects for prim in obj.to_primitives(unit=svg_unit) ]

        # setup viewport transform flipping y axis
        xform = f'translate({min_x} {min_y+h}) scale(1 -1) translate({-min_x} {-min_y})'

        svg_unit = 'in' if svg_unit == 'inch' else 'mm'
        # TODO export apertures as <uses> where reasonable.
        return tag('svg', [tag('g', primitives, transform=xform)],
                width=f'{w}{svg_unit}', height=f'{h}{svg_unit}',
                viewBox=f'{min_x} {min_y} {w} {h}',
                xmlns="http://www.w3.org/2000/svg", xmlns__xlink="http://www.w3.org/1999/xlink", root=True)

    def merge(self, other):
        """ Merge other GerberFile into this one """
        self.comments += other.comments

        # dedup apertures
        new_apertures = {}
        replace_apertures = {}
        for ap in self.apertures + other.apertures:
            gbr = ap.to_gerber()
            if gbr not in new_apertures:
                new_apertures[gbr] = ap
            else:
                replace_apertures[id(ap)] = new_apertures[gbr]
        self.apertures = list(new_apertures.values())

        self.objects += other.objects
        for obj in self.objects:
            # If object has an aperture attribute, replace that aperture.
            if (ap := replace_apertures.get(id(getattr(obj, 'aperture', None)))):
                obj.aperture = ap

        # dedup aperture macros
        macros = { m.to_gerber(): m
                for m in [ GenericMacros.circle, GenericMacros.rect, GenericMacros.obround, GenericMacros.polygon] }
        for ap in new_apertures.values():
            if isinstance(ap, apertures.ApertureMacroInstance):
                macro_grb = ap.macro.to_gerber() # use native unit to compare macros
                if macro_grb in macros:
                    ap.macro = macros[macro_grb]
                else:
                    macros[macro_grb] = ap.macro

        # make macro names unique
        seen_macro_names = set()
        for macro in macros.values():
            i = 2
            while (new_name := f'{macro.name}{i}') in seen_macro_names:
                i += 1
            macro.name = new_name
            seen_macro_names.add(new_name)

    def dilate(self, offset, unit='mm', polarity_dark=True):

        self.apertures = [ aperture.dilated(offset, unit) for aperture in self.apertures ]

        offset_circle = CircleAperture(offset, unit=unit)
        self.apertures.append(offset_circle)

        new_primitives = []
        for p in self.primitives:

            p.polarity_dark = polarity_dark

            # Ignore Line, Arc, Flash. Their actual dilation has already been done by dilating the apertures above.
            if isinstance(p, Region):
                ol = p.poly.outline
                for start, end, arc_center in zip(ol, ol[1:] + ol[0], p.poly.arc_centers):
                    if arc_center is not None:
                        new_primitives.append(Arc(*start, *end, *arc_center,
                            polarity_dark=polarity_dark, unit=p.unit, aperture=offset_circle))

                    else:
                        new_primitives.append(Line(*start, *end,
                            polarity_dark=polarity_dark, unit=p.unit, aperture=offset_circle))

        # it's safe to append these at the end since we compute a logical OR of opaque areas anyway.
        self.primitives.extend(new_primitives)

    @classmethod
    def open(kls, filename, enable_includes=False, enable_include_dir=None):
        with open(filename, "r") as f:
            if enable_includes and enable_include_dir is None:
                enable_include_dir = Path(filename).parent
            return kls.from_string(f.read(), enable_include_dir)

    @classmethod
    def from_string(kls, data, enable_include_dir=None):
        obj = kls()
        GerberParser(obj, include_dir=enable_include_dir).parse(data)
        return obj

    def size(self, unit='mm'):
        (x0, y0), (x1, y1) = self.bounding_box(unit, default=((0, 0), (0, 0)))
        return (x1 - x0, y1 - y0)

    def bounding_box(self, unit='mm', default=None):
        """ Calculate bounding box of file. Returns value given by 'default' argument when there are no graphical
        objects (default: None)
        """
        bounds = [ p.bounding_box(unit) for p in self.objects ]
        if not bounds:
            return default

        min_x = min(x0 for (x0, y0), (x1, y1) in bounds)
        min_y = min(y0 for (x0, y0), (x1, y1) in bounds)
        max_x = max(x1 for (x0, y0), (x1, y1) in bounds)
        max_y = max(y1 for (x0, y0), (x1, y1) in bounds)

        return ((min_x, min_y), (max_x, max_y))

    def generate_statements(self, drop_comments=True):
        yield UnitStmt()
        yield FormatSpecStmt()
        yield ImagePolarityStmt()
        yield SingleQuadrantModeStmt()
        yield LoadPolarityStmt(True)

        if not drop_comments:
            yield CommentStmt('File processed by Gerbonara. Original comments:')
            for cmt in self.comments:
                yield CommentStmt(cmt)

        # Always emit gerbonara's generic, rotation-capable aperture macro replacements for the standard C/R/O/P shapes.
        # Unconditionally emitting these here is easier than first trying to figure out if we need them later,
        # and they are only a few bytes anyway.
        yield ApertureMacroStmt(GenericMacros.circle)
        yield ApertureMacroStmt(GenericMacros.rect)
        yield ApertureMacroStmt(GenericMacros.obround)
        yield ApertureMacroStmt(GenericMacros.polygon)

        processed_macros = set()
        aperture_map = {}
        for number, aperture in enumerate(self.apertures, start=10):

            if isinstance(aperture, apertures.ApertureMacroInstance):
                macro_grb = aperture._rotated().macro.to_gerber() # use native unit to compare macros
                if macro_grb not in processed_macros:
                    processed_macros.add(macro_grb)
                    yield ApertureMacroStmt(aperture._rotated().macro)

            yield ApertureDefStmt(number, aperture)

            aperture_map[id(aperture)] = number

        gs = GraphicsState(aperture_map=aperture_map)
        for primitive in self.objects:
            yield from primitive.to_statements(gs)

        yield EofStmt()

    def __str__(self):
        return f'<GerberFile with {len(self.apertures)} apertures, {len(self.objects)} objects>'

    def save(self, filename, settings=None):
        with open(filename, 'w', encoding='utf-8') as f: # Encoding is specified as UTF-8 by spec.
            f.write(self.to_gerber(settings))

    def to_gerber(self, settings=None):
        # Use given settings, or use same settings as original file if not given, or use defaults if not imported from a
        # file
        if settings is None:
            settings = self.import_settings.copy() or FileSettings()
            settings.zeros = None
            settings.number_format = (5,6)
        return '\n'.join(stmt.to_gerber(settings) for stmt in self.generate_statements())

    def offset(self, dx=0,  dy=0, unit='mm'):
        # TODO round offset to file resolution
    
        #print(f'offset {dx},{dy} file unit')
        #for obj in self.objects:
        #    print('   ', obj)
        self.objects = [ obj.with_offset(dx, dy, unit) for obj in self.objects ]
        #print('after:')
        #for obj in self.objects:
        #    print('   ', obj)

    def rotate(self, angle:'radian', center=(0,0), unit='mm'):
        """ Rotate file contents around given point.

            Arguments:
            angle -- Rotation angle in radian clockwise.
            center -- Center of rotation (default: document origin (0, 0))

            Note that when rotating by odd angles other than 0, 90, 180 or 270 degree this method may replace standard
            rect and oblong apertures by macro apertures. Existing macro apertures are re-written.
        """
        if math.isclose(angle % (2*math.pi), 0):
            return

        # First, rotate apertures. We do this separately from rotating the individual objects below to rotate each
        # aperture exactly once.
        for ap in self.apertures:
            ap.rotation += angle

        #print(f'rotate {angle} @ {center}')
        #for obj in self.objects:
        #    print('   ', obj)

        for obj in self.objects:
            obj.rotate(angle, *center, unit)

        #print('after')
        #for obj in self.objects:
        #    print('   ', obj)
    
    def invert_polarity(self):
        for obj in self.objects:
            obj.polarity_dark = not p.polarity_dark
    

class GraphicsState:
    polarity_dark : bool = True
    image_polarity : str = 'positive' # IP image polarity; deprecated
    point : tuple = None
    aperture : apertures.Aperture = None
    file_settings : FileSettings = None
    interpolation_mode : InterpolationModeStmt = LinearModeStmt
    multi_quadrant_mode : bool = None # used only for syntax checking
    aperture_mirroring = (False, False) # LM mirroring (x, y)
    aperture_rotation = 0 # LR rotation in degree, ccw
    aperture_scale = 1 # LS scale factor, NOTE: same for both axes
    # The following are deprecated file-wide settings. We normalize these during parsing.
    image_offset : (float, float) = (0, 0)
    image_rotation: int = 0 # IR image rotation in degree ccw, one of 0, 90, 180 or 270; deprecated
    image_mirror : tuple = (False, False) # IM image mirroring, (x, y); deprecated
    image_scale : tuple = (1.0, 1.0) # SF image scaling (x, y); deprecated
    image_axes : str = 'AXBY' # AS axis mapping; deprecated
    # for statement generation
    aperture_map = {}


    def __init__(self, file_settings=None, aperture_map=None):
        self._mat = None
        self.file_settings = file_settings
        if aperture_map is not None:
            self.aperture_map = aperture_map

    def __setattr__(self, name, value):
        # input validation
        if name == 'image_axes' and value not in [None, 'AXBY', 'AYBX']:
            raise ValueError('image_axes must be either "AXBY", "AYBX" or None')
        elif name == 'image_rotation' and value not in [0, 90, 180, 270]:
            raise ValueError('image_rotation must be 0, 90, 180 or 270')
        elif name == 'image_polarity' and value not in ['positive', 'negative']:
            raise ValueError('image_polarity must be either "positive" or "negative"')
        elif name == 'image_mirror' and len(value) != 2:
            raise ValueError('mirror_image must be 2-tuple of bools: (mirror_a, mirror_b)')
        elif name == 'image_offset' and len(value) != 2:
            raise ValueError('image_offset must be 2-tuple of floats: (offset_a, offset_b)')
        elif name == 'image_scale' and len(value) != 2:
            raise ValueError('image_scale must be 2-tuple of floats: (scale_a, scale_b)')

        # polarity handling
        if name == 'image_polarity': # global IP statement image polarity, can only be set at beginning of file
            if self.image_polarity == 'negative':
                self.polarity_dark = False # evaluated before image_polarity is set below through super().__setattr__

        elif name == 'polarity_dark': # local LP statement polarity for subsequent objects
            if self.image_polarity == 'negative':
                value = not value

        super().__setattr__(name, value)

    def _update_xform(self):
        a, b = 1, 0
        c, d = 0, 1
        off_x, off_y = self.image_offset

        if self.image_mirror[0]:
            a = -1
        if self.image_mirror[1]:
            d = -1

        a *= self.image_scale[0]
        d *= self.image_scale[1]

        if self.image_rotation == 90:
            a, b, c, d = 0, -d, a, 0
            off_x, off_y = off_y, -off_x
        elif self.image_rotation == 180:
            a, b, c, d = -a, 0, 0, -d
            off_x, off_y = -off_x, -off_y
        elif self.image_rotation == 270:
            a, b, c, d = 0, d, -a, 0
            off_x, off_y = -off_y, off_x

        self.image_offset = off_x, off_y
        self._mat = a, b, c, d
    
    def map_coord(self, x, y, relative=False):
        if self._mat is None:
            self._update_xform()
        a, b, c, d = self._mat

        if not relative:
            rx, ry = (a*x + b*y + self.image_offset[0]), (c*x + d*y + self.image_offset[1])
            return rx, ry
        else:
            # Apply mirroring, scale and rotation, but do not apply offset
            rx, ry = (a*x + b*y), (c*x + d*y)
            return rx, ry

    def flash(self, x, y):
        self.update_point(x, y)
        return go.Flash(*self.map_coord(*self.point), self.aperture,
                polarity_dark=self.polarity_dark,
                unit=self.file_settings.unit)

    def interpolate(self, x, y, i=None, j=None, aperture=True):
        if self.point is None:
            warnings.warn('D01 interpolation without preceding D02 move.', SyntaxWarning)
            self.point = (0, 0)
        old_point = self.map_coord(*self.update_point(x, y))

        if aperture and math.isclose(self.aperture.equivalent_width(), 0):
            warnings.warn('D01 interpolation with a zero-size aperture. This is invalid according to spec, however, we '
                    'pass through the created objects here. Note that these will not show up in e.g. SVG output since '
                    'their line width is zero.', SyntaxWarning)

        if self.interpolation_mode == LinearModeStmt:
            if i is not None or j is not None:
                raise SyntaxError("i/j coordinates given for linear D01 operation (which doesn't take i/j)")

            return self._create_line(old_point, self.map_coord(*self.point), aperture)

        else:

            if i is None and j is None:
                warnings.warn('Linear segment implied during arc interpolation mode through D01 w/o I, J values', SyntaxWarning)
                return self._create_line(old_point, self.map_coord(*self.point), aperture)

            else:
                if i is None:
                    warnings.warn('Arc is missing I value', SyntaxWarning)
                    i = 0
                if j is None:
                    warnings.warn('Arc is missing J value', SyntaxWarning)
                    j = 0
                return self._create_arc(old_point, self.map_coord(*self.point), (i, j), aperture)

    def _create_line(self, old_point, new_point, aperture=True):
        return go.Line(*old_point, *new_point, self.aperture if aperture else None,
                polarity_dark=self.polarity_dark, unit=self.file_settings.unit)

    def _create_arc(self, old_point, new_point, control_point, aperture=True):
        clockwise = self.interpolation_mode == CircularCWModeStmt
        print('creating arc')
        print('  old point', old_point)
        print('  new point', new_point)
        print('  control point', self.map_coord(*control_point, relative=True))
        return go.Arc(*old_point, *new_point, *self.map_coord(*control_point, relative=True),
                clockwise=clockwise, aperture=(self.aperture if aperture else None),
                polarity_dark=self.polarity_dark, unit=self.file_settings.unit)

    def update_point(self, x, y, unit=None):
        old_point = self.point
        if x is None:
            x = self.point[0]
        if y is None:
            y = self.point[1]
        if unit == 'inch':
            x, y = x*25.4, y*25.4
        self.point = (x, y)
        return old_point

    # Helpers for gerber generation
    def set_polarity(self, polarity_dark):
        if self.polarity_dark != polarity_dark:
            self.polarity_dark = polarity_dark
            yield LoadPolarityStmt(polarity_dark)

    def set_aperture(self, aperture):
        if self.aperture != aperture:
            self.aperture = aperture
            yield ApertureStmt(self.aperture_map[id(aperture)])

    def set_current_point(self, point, unit=None):
        # TODO calculate appropriate precision for math.isclose given file_settings.notation
        if unit == 'inch':
            point_mm = point[0]*25.4, point[1]*25.4
        else:
            point_mm = point

        if not points_close(self.point, point_mm):
            self.point = point_mm
            yield MoveStmt(*point, unit=unit)

    def set_interpolation_mode(self, mode):
        if self.interpolation_mode != mode:
            self.interpolation_mode = mode
            yield mode()


class GerberParser:
    NUMBER = r"[\+-]?\d+"
    DECIMAL = r"[\+-]?\d+([.]?\d+)?"
    NAME = r"[a-zA-Z_$\.][a-zA-Z_$\.0-9+\-]+"

    STATEMENT_REGEXES = {
        'unit_mode': r"MO(?P<unit>(MM|IN))",
        'interpolation_mode': r"(?P<code>G0?[123]|G74|G75)$",
        'coord': fr"(X(?P<x>{NUMBER}))?(Y(?P<y>{NUMBER}))?" \
            fr"(I(?P<i>{NUMBER}))?(J(?P<j>{NUMBER}))?" \
            fr"(?P<operation>D0?[123])$",
        'aperture': r"(G54|G55)?D(?P<number>\d+)",
        'comment': r"G0?4(?P<comment>[^*]*)",
        'format_spec': r"FS(?P<zero>(L|T|D))?(?P<notation>(A|I))[NG0-9]*X(?P<x>[0-7][0-7])Y(?P<y>[0-7][0-7])[DM0-9]*",
        'load_polarity': r"LP(?P<polarity>(D|C))",
        # FIXME LM, LR, LS
        'load_name': r"LN(?P<name>.*)",
        'offset': fr"OF(A(?P<a>{DECIMAL}))?(B(?P<b>{DECIMAL}))?",
        'include_file': r"IF(?P<filename>.*)",
        'image_name': r"IN(?P<name>.*)",
        'axis_selection': r"AS(?P<axes>AXBY|AYBX)",
        'image_polarity': r"IP(?P<polarity>(POS|NEG))",
        'image_rotation': fr"IR(?P<rotation>{NUMBER})",
        'mirror_image': r"MI(A(?P<a>0|1))?(B(?P<b>0|1))?",
        'scale_factor': fr"SF(A(?P<a>{DECIMAL}))?(B(?P<b>{DECIMAL}))?",
        'aperture_definition': fr"ADD(?P<number>\d+)(?P<shape>C|R|O|P|{NAME})[,]?(?P<modifiers>[^,%]*)",
        'aperture_macro': fr"AM(?P<name>{NAME})\*(?P<macro>[^%]*)",
        'region_start': r'G36',
        'region_end': r'G37',
        'old_unit':r'(?P<mode>G7[01])',
        'old_notation': r'(?P<mode>G9[01])',
        'eof': r"M0?[02]",
        'ignored': r"(?P<stmt>M01)",
        }

    STATEMENT_REGEXES = { key: re.compile(value) for key, value in STATEMENT_REGEXES.items() }


    def __init__(self, target, include_dir=None):
        """ Pass an include dir to enable IF include statements (potentially DANGEROUS!). """
        self.target = target
        self.include_dir = include_dir
        self.include_stack = []
        self.file_settings = FileSettings()
        self.graphics_state = GraphicsState(file_settings=self.file_settings)
        self.aperture_map = {}
        self.aperture_macros = {}
        self.current_region = None
        self.eof_found = False
        self.multi_quadrant_mode = None # used only for syntax checking
        self.macros = {}
        self.last_operation = None

    @classmethod
    def _split_commands(kls, data):
        """
        Split the data into commands. Commands end with * (and also newline to help with some badly formatted files)
        """

        start = 0
        extended_command = False

        for pos, c in enumerate(data):
            if c == '%':
                if extended_command:
                    yield data[start:pos]
                    extended_command = False

                else:
                    extended_command = True

                start = pos + 1
                continue

            elif extended_command:
                continue

            if c == '\r' or c == '\n' or c == '*':
                word_command = data[start:pos].strip()
                if word_command and word_command != '*':
                    yield word_command
                start = pos + 1

    def parse(self, data):
        for line in self._split_commands(data):
            if not line.strip():
                continue
            line = line.rstrip('*').strip()
            # We cannot assume input gerber to use well-formed statement delimiters. Thus, we may need to parse
            # multiple statements from one line.
            if line.strip() and self.eof_found:
                warnings.warn('Data found in gerber file after EOF.', SyntaxWarning)

            for name, le_regex in self.STATEMENT_REGEXES.items():
                if (match := le_regex.match(line)):
                    getattr(self, f'_parse_{name}')(match.groupdict())
                    line = line[match.end(0):]
                    break

            else:
                warnings.warn(f'Unknown statement found: "{line}", ignoring.', SyntaxWarning)
                self.target.comments.append(f'Unknown statement found: "{line}", ignoring.')
        
        self.target.apertures = list(self.aperture_map.values())
        self.target.import_settings = self.file_settings
        self.target.unit = self.file_settings.unit

        if not self.eof_found:
                    warnings.warn('File is missing mandatory M02 EOF marker. File may be truncated.', SyntaxWarning)

    def _parse_interpolation_mode(self, match):
        if match['code'] == 'G01':
            self.graphics_state.interpolation_mode = LinearModeStmt
        elif match['code'] == 'G02':
            self.graphics_state.interpolation_mode = CircularCWModeStmt
        elif match['code'] == 'G03':
            self.graphics_state.interpolation_mode = CircularCCWModeStmt
        elif match['code'] == 'G74':
            self.multi_quadrant_mode = True # used only for syntax checking
        elif match['code'] == 'G75':
            self.multi_quadrant_mode = False
            # we always emit a G75 at the beginning of the file.

    def _parse_coord(self, match):
        x = self.file_settings.parse_gerber_value(match['x'])
        y = self.file_settings.parse_gerber_value(match['y'])
        i = self.file_settings.parse_gerber_value(match['i'])
        j = self.file_settings.parse_gerber_value(match['j'])

        if not (op := match['operation']):
            if self.last_operation == 'D01':
                warnings.warn('Coordinate statement without explicit operation code. This is forbidden by spec.',
                        SyntaxWarning)
                op = 'D01'
            else:
                raise SyntaxError('Ambiguous coordinate statement. Coordinate statement does not have an operation '\
                                  'mode and the last operation statement was not D01.')

        self.last_operation = op

        if op in ('D1', 'D01'):
            if self.graphics_state.interpolation_mode != LinearModeStmt:
                if self.multi_quadrant_mode is None:
                    warnings.warn('Circular arc interpolation without explicit G75 Single-Quadrant mode statement. '\
                            'This can cause problems with older gerber interpreters.', SyntaxWarning)

                elif self.multi_quadrant_mode:
                    raise SyntaxError('Circular arc interpolation in multi-quadrant mode (G74) is not implemented.')

            if self.current_region is None:
                self.target.objects.append(self.graphics_state.interpolate(x, y, i, j))
            else:
                self.current_region.append(self.graphics_state.interpolate(x, y, i, j, aperture=False))

        else:
            if i is not None or j is not None:
                raise SyntaxError("i/j coordinates given for D02/D03 operation (which doesn't take i/j)")
                
            if op in ('D2', 'D02'):
                self.graphics_state.update_point(x, y)
                if self.current_region:
                    # Start a new region for every outline. As gerber has no concept of fill rules or winding numbers,
                    # it does not make a graphical difference, and it makes the implementation slightly easier.
                    self.target.objects.append(self.current_region)
                    self.current_region = go.Region(
                            polarity_dark=self.graphics_state.polarity_dark,
                            unit=self.file_settings.unit)

            else: # D03
                if self.current_region is None:
                    self.target.objects.append(self.graphics_state.flash(x, y))
                else:
                    raise SyntaxError('DO3 flash statement inside region')

    def _parse_aperture(self, match):
        number = int(match['number'])
        if number < 10:
            raise SyntaxError(f'Invalid aperture number {number}: Aperture number must be >= 10.')

        if number not in self.aperture_map:
            raise SyntaxError(f'Tried to access undefined aperture {number}')

        self.graphics_state.aperture = self.aperture_map[number]

    def _parse_aperture_definition(self, match):
        # number, shape, modifiers
        modifiers = [ float(val) for val in match['modifiers'].split('X') ] if match['modifiers'].strip() else []

        aperture_classes = {
                'C': apertures.CircleAperture,
                'R': apertures.RectangleAperture,
                'O': apertures.ObroundAperture,
                'P': apertures.PolygonAperture,
            }

        if (kls := aperture_classes.get(match['shape'])):
            if match['shape'] == 'P' and math.isclose(modifiers[0], 0):
                warnings.warn('Definition of zero-size polygon aperture. This is invalid according to spec.' , SyntaxWarning)

            if match['shape'] in 'RO' and (math.isclose(modifiers[0], 0) or math.isclose(modifiers[1], 0)):
                warnings.warn('Definition of zero-width and/or zero-height rectangle or obround aperture. This is invalid according to spec.' , SyntaxWarning)

            new_aperture = kls(*modifiers, unit=self.file_settings.unit)

        elif (macro := self.aperture_macros.get(match['shape'])):
            new_aperture = apertures.ApertureMacroInstance(macro, modifiers, unit=self.file_settings.unit)

        else:
            raise ValueError(f'Aperture shape "{match["shape"]}" is unknown')

        self.aperture_map[int(match['number'])] = new_aperture

    def _parse_aperture_macro(self, match):
        self.aperture_macros[match['name']] = ApertureMacro.parse_macro(
                match['name'], match['macro'], self.file_settings.unit)
    
    def _parse_format_spec(self, match):
        # This is a common problem in Eagle files, so just suppress it
        self.file_settings.zeros = {'L': 'leading', 'T': 'trailing'}.get(match['zero'], 'leading')
        self.file_settings.notation = 'incremental' if match['notation'] == 'I' else 'absolute'

        if match['x'] != match['y']:
            raise SyntaxError(f'FS specifies different coordinate formats for X and Y ({match["x"]} != {match["y"]})')
        self.file_settings.number_format = int(match['x'][0]), int(match['x'][1])

    def _parse_unit_mode(self, match):
        if match['unit'] == 'MM':
            self.file_settings.unit = 'mm'
        else:
            self.file_settings.unit = 'inch'

    def _parse_load_polarity(self, match):
        self.graphics_state.polarity_dark = match['polarity'] == 'D'

    def _parse_offset(self, match):
        a, b = match['a'], match['b']
        a = float(a) if a else 0
        b = float(b) if b else 0
        self.graphics_state.offset = a, b

    def _parse_include_file(self, match):
        if self.include_dir is None:
            warnings.warn('IF include statement found, but includes are deactivated.', ResourceWarning)
        else:
            warnings.warn('IF include statement found. Includes are activated, but is this really a good idea?', ResourceWarning)

        include_file = self.include_dir / param["filename"]
        # Do not check if path exists to avoid leaking existence via error message
        include_file = include_file.resolve(strict=False)
        
        if not include_file.is_relative_to(self.include_dir):
            raise FileNotFoundError('Attempted traversal to parent of include dir in path from IF include statement')

        if not include_file.is_file():
            raise FileNotFoundError('File pointed to by IF include statement does not exist')

        if include_file in self.include_stack:
            raise ValueError("Recusive inclusion via IF include statement.")
        self.include_stack.append(include_file)

        # Spec 2020-09 section 3.1: Gerber files must use UTF-8
        self._parse(f.read_text(encoding='UTF-8'))
        self.include_stack.pop()

    def _parse_image_name(self, match):
        warnings.warn('Deprecated IN (image name) statement found. This deprecated since rev. I4 (Oct 2013).',
                DeprecationWarning)
        self.target.comments.append(f'Image name: {match["name"]}')

    def _parse_load_name(self, match):
        warnings.warn('Deprecated LN (load name) statement found. This deprecated since rev. I4 (Oct 2013).',
                DeprecationWarning)

    def _parse_axis_selection(self, match):
        warnings.warn('Deprecated AS (axis selection) statement found. This deprecated since rev. I1 (Dec 2012).',
                DeprecationWarning)
        self.graphics_state.output_axes = match['axes']

    def _parse_image_polarity(self, match):
        # Do not warn, this is still common.
        # warnings.warn('Deprecated IP (image polarity) statement found. This deprecated since rev. I4 (Oct 2013).',
        #         DeprecationWarning)
        self.graphics_state.image_polarity = dict(POS='positive', NEG='negative')[match['polarity']]
    
    def _parse_image_rotation(self, match):
        warnings.warn('Deprecated IR (image rotation) statement found. This deprecated since rev. I1 (Dec 2012).',
                DeprecationWarning)
        self.graphics_state.image_rotation = int(match['rotation'])

    def _parse_mirror_image(self, match):
        warnings.warn('Deprecated MI (mirror image) statement found. This deprecated since rev. I1 (Dec 2012).',
                DeprecationWarning)
        self.graphics_state.mirror = bool(int(match['a'] or '0')), bool(int(match['b'] or '1'))

    def _parse_scale_factor(self, match):
        warnings.warn('Deprecated SF (scale factor) statement found. This deprecated since rev. I1 (Dec 2012).',
                DeprecationWarning)
        a = float(match['a']) if match['a'] else 1.0
        b = float(match['b']) if match['b'] else 1.0
        self.graphics_state.scale_factor = a, b

    def _parse_comment(self, match):
        self.target.comments.append(match["comment"])

    def _parse_region_start(self, _match):
        self.current_region = go.Region(
                polarity_dark=self.graphics_state.polarity_dark,
                unit=self.file_settings.unit)

    def _parse_region_end(self, _match):
        if self.current_region is None:
            raise SyntaxError('Region end command (G37) outside of region')
        
        if self.current_region: # ignore empty regions
            self.target.objects.append(self.current_region)
        self.current_region = None

    def _parse_old_unit(self, match):
        self.file_settings.unit = 'inch' if match['mode'] == 'G70' else 'mm'
        warnings.warn(f'Deprecated {match["mode"]} unit mode statement found. This deprecated since 2012.',
                    DeprecationWarning)
        self.target.comments.append('Replaced deprecated {match["mode"]} unit mode statement with MO statement')

    def _parse_old_notation(self, match):
        # FIXME make sure we always have FS at end of processing.
        self.file_settings.notation = 'absolute' if match['mode'] == 'G90' else 'incremental'
        warnings.warn(f'Deprecated {match["mode"]} notation mode statement found. This deprecated since 2012.',
                    DeprecationWarning)
        self.target.comments.append('Replaced deprecated {match["mode"]} notation mode statement with FS statement')
    
    def _parse_eof(self, _match):
        self.eof_found = True

    def _parse_ignored(self, match):
        pass


def _match_one(expr, data):
    match = expr.match(data)
    if match is None:
        return ({}, None)
    else:
        return (match.groupdict(), data[match.end(0):])


def _match_one_from_many(exprs, data):
    for expr in exprs:
        match = expr.match(data)
        if match:
            return (match.groupdict(), data[match.end(0):])

    return ({}, None)

if __name__ == '__main__':
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument('testfile')
    args = parser.parse_args()

    print(GerberFile.open(args.testfile).to_gerber())