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Diffstat (limited to 'gerbonara/aperture_macros/parse.py')
| -rw-r--r-- | gerbonara/aperture_macros/parse.py | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/gerbonara/aperture_macros/parse.py b/gerbonara/aperture_macros/parse.py new file mode 100644 index 0000000..0fa936f --- /dev/null +++ b/gerbonara/aperture_macros/parse.py @@ -0,0 +1,181 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- + +# Copyright 2021 Jan Götte <gerbonara@jaseg.de> + +import operator +import re +import ast +import copy +import math + +from . import primitive as ap +from .expression import * +from ..utils import MM + +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, body, unit): + macro = cls(name) + + blocks = re.sub(r'\s', '', body).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] == '$': # variable definition + name, expr = block.partition('=') + number = int(name[1:]) + if number in macro.variables: + raise SyntaxError(f'Re-definition of aperture macro variable {number} inside macro') + macro.variables[number] = _parse_expression(expr) + + else: # primitive + primitive, *args = block.split(',') + args = [ _parse_expression(arg) for arg in args ] + primitive = ap.PRIMITIVE_CLASSES[int(primitive)](unit=unit, args=args) + macro.primitives.append(primitive) + + return macro + + @property + def name(self): + if self._name is not None: + return self._name + else: + return f'gn_{hash(self)}' + + @name.setter + def name(self, name): + self._name = name + + def __str__(self): + return f'<Aperture macro {self.name}, variables {str(self.variables)}, primitives {self.primitives}>' + + def __repr__(self): + return str(self) + + def __eq__(self, other): + return hasattr(other, 'to_gerber') and self.to_gerber() == other.to_gerber() + + def __hash__(self): + return hash(self.to_gerber()) + + def dilated(self, offset, unit=MM): + dup = copy.deepcopy(self) + new_primitives = [] + for primitive in dup.primitives: + try: + if primitive.exposure.calculate(): + primitive.dilate(offset, unit) + new_primitives.append(primitive) + except IndexError: + warnings.warn('Cannot dilate aperture macro primitive with exposure value computed from macro variable.') + pass + dup.primitives = new_primitives + return dup + + def to_gerber(self, unit=None): + comments = [ c.to_gerber() for c in self.comments ] + variable_defs = [ f'${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, parameters : [float], unit=None, polarity_dark=True): + variables = dict(self.variables) + for number, value in enumerate(parameters, start=1): + if number in variables: + raise SyntaxError(f'Re-definition of aperture macro variable {i} through parameter {value}') + variables[number] = value + + for primitive in self.primitives: + yield from primitive.to_graphic_primitives(offset, rotation, variables, unit, polarity_dark) + + def rotated(self, angle): + dup = copy.deepcopy(self) + for primitive in dup.primitives: + # aperture macro primitives use degree counter-clockwise, our API uses radians clockwise + primitive.rotation -= rad_to_deg(angle) + return dup + + +cons, var = ConstantExpression, VariableExpression +deg_per_rad = 180 / math.pi + +class GenericMacros: + + _generic_hole = lambda n: [ + ap.Circle('mm', [0, var(n), 0, 0]), + ap.CenterLine('mm', [0, var(n), var(n+1), 0, 0, var(n+2) * -deg_per_rad])] + + # NOTE: All generic macros have rotation values specified in **clockwise radians** like the rest of the user-facing + # API. + circle = ApertureMacro('GNC', [ + ap.Circle('mm', [1, var(1), 0, 0, var(4) * -deg_per_rad]), + *_generic_hole(2)]) + + rect = ApertureMacro('GNR', [ + ap.CenterLine('mm', [1, var(1), var(2), 0, 0, var(5) * -deg_per_rad]), + *_generic_hole(3) ]) + + # w must be larger than h + obround = ApertureMacro('GNO', [ + ap.CenterLine('mm', [1, var(1), var(2), 0, 0, var(5) * -deg_per_rad]), + ap.Circle('mm', [1, var(2), +var(1)/2, 0, var(5) * -deg_per_rad]), + ap.Circle('mm', [1, var(2), -var(1)/2, 0, var(5) * -deg_per_rad]), + *_generic_hole(3) ]) + + polygon = ApertureMacro('GNP', [ + ap.Polygon('mm', [1, var(2), 0, 0, var(1), var(3) * -deg_per_rad]), + ap.Circle('mm', [0, var(4), 0, 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) |