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#!/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()
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