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-rw-r--r--gerbolyze/protoboard.py239
1 files changed, 239 insertions, 0 deletions
diff --git a/gerbolyze/protoboard.py b/gerbolyze/protoboard.py
new file mode 100644
index 0000000..2f45980
--- /dev/null
+++ b/gerbolyze/protoboard.py
@@ -0,0 +1,239 @@
+#!/usr/bin/env python3
+
+import re
+import textwrap
+import ast
+
+svg_str = lambda content: content if isinstance(content, str) else '\n'.join(str(c) for c in content)
+
+class Pattern:
+ def __init__(self, w, h, content):
+ self.w = w
+ self.h = h
+ self.content = content
+
+ @property
+ def svg_id(self):
+ return f'pat-{id(self):16x}'
+
+ def __str__(self):
+ return textwrap.dedent(f'''
+ <pattern id="{self.svg_id}" viewBox="0,0,{self.w},{self.h}" width="{self.w}" height="{self.h}" patternUnits="userSpaceOnUse">
+ {svg_str(self.content)}
+ </pattern>''')
+
+ def make_rect(x, y, w, h):
+ return f'<rect x="{x}" y="{y}" w="{w}" h="{h}" fill="url(#{self.svg_id})"/>'
+
+class CirclePattern(Pattern):
+ def __init__(self, d, w, h=None):
+ self.d = d
+ self.w = w
+ self.h = h or w
+
+ @property
+ def content(self):
+ return f'<circle cx={self.w/2} cy={self.h/2} r={self.d/2}/>'
+
+make_layer = lambda layer_name, content: \
+ f'<g id="g-{layer_name.replace(" ", "-")}" inkscape:label="{layer_name}" inkscape:groupmode="layer">{svg_str(content)}</g>'
+
+svg_template = textwrap.dedent('''
+ <?xml version="1.0" encoding="UTF-8" standalone="no"?>
+ <svg version="1.1" width="{w}mm" height="{h}mm" viewBox="0 0 {w} {h}" id="svg18" sodipodi:docname="proto.svg"
+ inkscape:version="1.2 (dc2aedaf03, 2022-05-15)"
+ xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+ xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:svg="http://www.w3.org/2000/svg">
+ <defs id="defs2">
+ {defs}
+ </defs>
+ <sodipodi:namedview inkscape:current-layer="g-top-copper" id="namedview4" pagecolor="#ffffff" bordercolor="#666666"
+ borderopacity="1.0" inkscape:showpageshadow="2" inkscape:pageopacity="0.0" inkscape:pagecheckerboard="0"
+ inkscape:deskcolor="#d1d1d1" inkscape:document-units="mm" showgrid="false" inkscape:zoom="2.8291492"
+ inkscape:cx="157.29111" inkscape:cy="80.943063" inkscape:window-width="1920" inkscape:window-height="1011"
+ inkscape:window-x="0" inkscape:window-y="0" inkscape:window-maximized="1" />
+ {layers}
+ </svg>
+''')
+
+class PatternProtoArea:
+ def __init__(self, pitch_x, pitch_y=None):
+ self.pitch_x = pitch_x
+ self.pitch_y = pitch_y or pitch_x
+
+ @property
+ def pitch(self):
+ if self.pitch_x != self.pitch_y:
+ raise ValueError('Pattern has different X and Y pitches')
+ return self.pitch_x
+
+ def fit_rect(self, x, y, w, h, center=True):
+ w_fit, h_fit = round(w - (w % self.pitch_x), 6), round(h - (h % self.pitch_y), 6)
+
+ if center:
+ x = x + (w-w_fit)/2
+ y = y + (h-h_fit)/2
+ return x, y, w_fit, h_fit
+
+ else:
+ return x, y, w_fit, h_fit
+
+class THTProtoAreaCircles:
+ def __init__(self, pad_dia=2.0, drill=1.0, pitch=2.54, sides='both', plated=True):
+ super(pitch)
+ self.pad_dia = pad_dia
+ self.drill = drill
+ self.drill_pattern = CirclePattern(self.drill, self.pitch)
+ self.pad_pattern = CirclePattern(self.pad_dia, self.pitch)
+ self.patterns = [self.drill_pattern, self.pad_pattern]
+ self.plated = plated
+ self.sides = sides
+
+ def generate(self, x, y, w, h, center=True):
+ x, y, w, h = self.fit_rect(x, y, w, h, center)
+ drill = 'plated drill' if self.plated else 'nonplated drill'
+ d = { drill: self.drill_pattern.make_rect(x, y, w, h) }
+
+ if self.sides in ('top', 'both'):
+ d['top copper'] = self.pad_pattern.make_rect(x, y, w, h)
+ if self.sides in ('bottom', 'both'):
+ d['bottom copper'] = self.pad_pattern.make_rect(x, y, w, h)
+
+ return d
+
+class ProtoBoard:
+ def __init__(self, desc_str):
+ pass
+
+def convert_to_mm(value, unit):
+ match unit.lower():
+ case 'mm': return value
+ case 'cm': return value*10
+ case 'in': return value*25.4
+ case 'mil': return value/1000*25.4
+ raise ValueError(f'Invalid unit {unit}, allowed units are mm, cm, in, and mil.')
+
+value_re = re.compile('([0-9]*\.?[0-9]+)(cm|mm|in|mil|%)')
+def eval_value(value, total_length=None):
+ if not isinstance(value, str):
+ return None
+
+ m = value_re.match(value)
+ number, unit = m.groups()
+ if unit == '%':
+ if total_length is None:
+ raise ValueError('Percentages are not allowed for this value')
+ return total_length * float(number) / 100
+ return convert_to_mm(float(number), unit)
+
+class PropLayout:
+ def __init__(self, content, direction, proportions):
+ self.content = content
+ self.direction = direction
+ self.proportions = proportions
+ if len(content) != len(proportions):
+ raise ValueError('proportions and content must have same length')
+
+ def layout(self, length):
+ out = [ eval_value(value, length) for value in self.proportions ]
+ total_length = sum(value for value in out if value is not None)
+ if length - total_length < -1e-6:
+ raise ValueError(f'Proportions sum to {total_length} mm, which is greater than the available space of {length} mm.')
+
+ leftover = length - total_length
+ sum_props = sum( (value or 1.0) for value in self.proportions if not isinstance(value, str) )
+ return [ (leftover * (value or 1.0) / sum_props if not isinstance(value, str) else calculated)
+ for value, calculated in zip(self.proportions, out) ]
+
+ def __str__(self):
+ children = ', '.join( f'{elem}:{width}' for elem, width in zip(self.content, self.proportions))
+ return f'PropLayout[{self.direction.upper()}]({children})'
+
+def _map_expression(node):
+ match node:
+ case ast.Name():
+ return node.id
+
+ case ast.Constant():
+ return node.value
+
+ case ast.BinOp(op=ast.BitOr()) | ast.BinOp(op=ast.BitAnd()):
+ left_prop = right_prop = None
+
+ left, right = node.left, node.right
+
+ if isinstance(left, ast.BinOp) and isinstance(left.op, ast.MatMult):
+ left_prop = _map_expression(left.right)
+ left = left.left
+
+ if isinstance(right, ast.BinOp) and isinstance(right.op, ast.MatMult):
+ right_prop = _map_expression(right.right)
+ right = right.left
+
+ direction = 'h' if isinstance(node.op, ast.BitOr) else 'v'
+ left, right = _map_expression(left), _map_expression(right)
+
+ if isinstance(left, PropLayout) and left.direction == direction and left_prop is None:
+ left.content.append(right)
+ left.proportions.append(right_prop)
+ return left
+
+ elif isinstance(right, PropLayout) and right.direction == direction and right_prop is None:
+ right.content.insert(0, left)
+ right.proportions.insert(0, left_prop)
+ return right
+
+ else:
+ return PropLayout([left, right], direction, [left_prop, right_prop])
+
+ case ast.BinOp(op=ast.MatMult()):
+ raise SyntaxError(f'Unexpected width specification "{ast.unparse(node.right)}"')
+
+ case _:
+ raise SyntaxError(f'Invalid layout expression "{ast.unparse(node)}"')
+
+def parse_layout(expr):
+ ''' Example layout:
+
+ ( tht @ 2in | smd ) @ 50% / tht
+ '''
+
+ expr = re.sub(r'\s', '', expr).lower()
+ expr = re.sub(r'([0-9]*\.?[0-9]+)(mm|cm|in|mil|%)', r'"\1\2"', expr)
+ expr = expr.replace('/', '&')
+ try:
+ expr = ast.parse(expr, mode='eval').body
+ match expr:
+ case ast.Name():
+ return PropLayout([expr.id], 'h', [None])
+
+ case ast.BinOp(op=ast.MatMult()):
+ assert isinstance(expr.right, ast.Constant)
+ return PropLayout([_map_expression(expr.left)], 'h', [expr.right.value])
+
+ case _:
+ return _map_expression(expr)
+ except SyntaxError as e:
+ raise SyntaxError('Invalid layout expression') from e
+
+if __name__ == '__main__':
+ import sys
+ for line in [
+ 'tht',
+ 'tht@1mm',
+ 'tht|tht',
+ 'tht@1mm|tht',
+ 'tht|tht|tht',
+ 'tht@1mm|tht@2mm|tht@3mm',
+ '(tht@1mm|tht@2mm)|tht@3mm',
+ 'tht@1mm|(tht@2mm|tht@3mm)',
+ 'tht@2|tht|tht',
+ '(tht@1mm|tht|tht@3mm) / tht',
+ ]:
+ layout = parse_layout(line)
+ print(line, '->', layout)
+ print(' ', layout.layout(100))
+ print()
+