summaryrefslogtreecommitdiff
path: root/gerbonara/gerber/aperture_macros/parse.py
blob: 35cb6c26c34972988723c13bf2ea6df6d60b6823 (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
#!/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 *

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)

    @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, 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


cons, var = ConstantExpression, VariableExpression
deg_per_rad = 180 / math.pi

class GenericMacros:

    _generic_hole = lambda n: [
            ap.Circle(None, [0, var(n), 0, 0]),
            ap.CenterLine(None, [0, var(n), var(n+1), 0, 0, var(n+2) * deg_per_rad])]

    # Initialize all these with "None" units so they inherit file units, and do not convert their arguments.
    circle = ApertureMacro('GNC', [
        ap.Circle(None, [1, var(1), 0, 0, var(4) * deg_per_rad]),
        *_generic_hole(2)])

    rect = ApertureMacro('GNR', [
        ap.CenterLine(None, [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(None, [1, var(1), var(2), 0, 0, var(5) * deg_per_rad]),
        ap.Circle(None, [1, var(2), +var(1)/2, 0, var(5) * deg_per_rad]),
        ap.Circle(None, [1, var(2), -var(1)/2, 0, var(5) * deg_per_rad]),
        *_generic_hole(3) ])

    polygon = ApertureMacro('GNP', [
        ap.Polygon(None, [1, var(2), 0, 0, var(1), var(3) * deg_per_rad]),
        ap.Circle(None, [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)