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-rw-r--r--gerbonara/gerber/aperture_macros/parse.py153
1 files changed, 153 insertions, 0 deletions
diff --git a/gerbonara/gerber/aperture_macros/parse.py b/gerbonara/gerber/aperture_macros/parse.py
new file mode 100644
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+++ b/gerbonara/gerber/aperture_macros/parse.py
@@ -0,0 +1,153 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2021 Jan Götte <gerbonara@jaseg.de>
+
+import operator
+import re
+import ast
+import copy
+import math
+
+import primitive as ap
+from expression import *
+
+from .. import apertures
+
+def rad_to_deg(x):
+ return (x / math.pi) * 180
+
+def _map_expression(node):
+ if isinstance(node, ast.Num):
+ return ConstantExpression(node.n)
+
+ elif isinstance(node, ast.BinOp):
+ op_map = {ast.Add: operator.add, ast.Sub: operator.sub, ast.Mult: operator.mul, ast.Div: operator.truediv}
+ return OperatorExpression(op_map[type(node.op)], _map_expression(node.left), _map_expression(node.right))
+
+ elif isinstance(node, ast.UnaryOp):
+ if type(node.op) == ast.UAdd:
+ return _map_expression(node.operand)
+ else:
+ return OperatorExpression(operator.sub, ConstantExpression(0), _map_expression(node.operand))
+
+ elif isinstance(node, ast.Name):
+ return VariableExpression(int(node.id[3:])) # node.id has format var[0-9]+
+
+ else:
+ raise SyntaxError('Invalid aperture macro expression')
+
+def _parse_expression(expr):
+ expr = expr.lower().replace('x', '*')
+ expr = re.sub(r'\$([0-9]+)', r'var\1', expr)
+ try:
+ parsed = ast.parse(expr, mode='eval').body
+ except SyntaxError as e:
+ raise SyntaxError('Invalid aperture macro expression') from e
+ return _map_expression(parsed)
+
+class ApertureMacro:
+ def __init__(self, name=None, primitives=None, variables=None):
+ self._name = name
+ self.comments = []
+ self.variables = variables or {}
+ self.primitives = primitives or []
+
+ @classmethod
+ def parse_macro(cls, name, macro, unit):
+ macro = cls(name)
+
+ blocks = re.sub(r'\s', '', macro).split('*')
+ for block in blocks:
+ if not (block := block.strip()): # empty block
+ continue
+
+ if block[0:1] == '0 ': # comment
+ macro.comments.append(Comment(block[2:]))
+
+ if block[0] == '$': # variable definition
+ name, expr = block.partition('=')
+ number = int(name[1:])
+ if number in macro.variables:
+ raise SyntaxError(f'Re-definition of aperture macro variable {number} inside macro')
+ macro.variables[number] = _parse_expression(expr)
+
+ else: # primitive
+ primitive, *args = block.split(',')
+ args = [_parse_expression(arg) for arg in args]
+ primitive = ap.PRIMITIVE_CLASSES[int(primitive)](unit=unit, args=args
+ macro.primitives.append(primitive)
+
+ @property
+ def name(self):
+ if self.name is not None:
+ return self.name
+ else:
+ return f'gn_{hash(self)}'
+
+ def __str__(self):
+ return f'<Aperture macro, variables {str(self.variables)}, primitives {self.primitives}>'
+
+ def __eq__(self, other):
+ return hasattr(other, to_gerber) and self.to_gerber() == other.to_gerber()
+
+ def __hash__(self):
+ return hash(self.to_gerber())
+
+ def to_gerber(self, unit=None):
+ comments = [ c.to_gerber() for c in self.comments ]
+ variable_defs = [ f'${var.to_gerber(unit)}={expr}' for var, expr in self.variables.items() ]
+ primitive_defs = [ prim.to_gerber(unit) for prim in self.primitives ]
+ return '*\n'.join(comments + variable_defs + primitive_defs)
+
+ def to_graphic_primitives(self, offset, rotation:'radians', parameters : [float], unit=None):
+ variables = dict(self.variables)
+ for number, value in enumerate(parameters):
+ if i in variables:
+ raise SyntaxError(f'Re-definition of aperture macro variable {i} through parameter {value}')
+ variables[i] = value
+
+ return [ primitive.to_graphic_primitives(offset, rotation, variables, unit) for primitive in self.primitives ]
+
+ def rotated(self, angle):
+ copy = copy.deepcopy(self)
+ for primitive in copy.primitives:
+ primitive.rotation += rad_to_deg(angle)
+ return copy
+
+
+class GenericMacros:
+ deg_per_rad = 180 / math.pi
+ cons, var = VariableExpression
+ _generic_hole = lambda n: [
+ ap.Circle(exposure=0, diameter=var(n), x=0, y=0),
+ ap.Rectangle(exposure=0, w=var(n), h=var(n+1), x=0, y=0, rotation=var(n+2) * deg_per_rad)]
+
+ circle = ApertureMacro([
+ ap.Circle(exposure=1, diameter=var(1), x=0, y=0, rotation=var(4) * deg_per_rad),
+ *_generic_hole(2)])
+
+ rect = ApertureMacro([
+ ap.Rectangle(exposure=1, w=var(1), h=var(2), x=0, y=0, rotation=var(5) * deg_per_rad),
+ *_generic_hole(3) ])
+
+ # w must be larger than h
+ obround = ApertureMacro([
+ ap.Rectangle(exposure=1, w=var(1), h=var(2), x=0, y=0, rotation=var(5) * deg_per_rad),
+ ap.Circle(exposure=1, diameter=var(2), x=+var(1)/2, y=0, rotation=var(5) * deg_per_rad),
+ ap.Circle(exposure=1, diameter=var(2), x=-var(1)/2, y=0, rotation=var(5) * deg_per_rad),
+ *_generic_hole(3) ])
+
+ polygon = ApertureMacro([
+ ap.Polygon(exposure=1, n_vertices=var(2), x=0, y=0, diameter=var(1), rotation=var(3) * deg_per_rad),
+ pa.Circle(exposure=0, diameter=var(4), x=0, y=0)])
+
+
+if __name__ == '__main__':
+ import sys
+ #for line in sys.stdin:
+ #expr = _parse_expression(line.strip())
+ #print(expr, '->', expr.optimized())
+
+ for primitive in parse_macro(sys.stdin.read(), 'mm'):
+ print(primitive)