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diff --git a/gerberex/am_primitive.py b/gerberex/am_primitive.py
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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+from gerber.utils import *
+from gerber.am_statements import *
+from gerber.am_eval import OpCode
+
+from gerberex.am_expression import eval_macro
+
+class AMPrimitiveDef(AMPrimitive):
+    def __init__(self, code, exposure=None, rotation=0):
+        super(AMPrimitiveDef, self).__init__(code, exposure)
+        self.rotation = rotation
+
+    def to_inch(self):
+        pass
+    
+    def to_metric(self):
+        pass
+
+    def to_gerber(self, settings=None):
+        pass
+
+    def to_instructions(self):
+        pass
+
+class AMCommentPrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        return cls(code, modifiers[0])
+    
+    def __init__(self, code, comment):
+        super(AMCommentPrimitiveDef, self).__init__(code)
+        self.comment = comment
+    
+    def to_gerber(self, settings=None):
+        return '%d %s*' % (self.code, self.comment.to_gerber())
+    
+    def to_instructions(self):
+        return [(OpCode.PUSH, self.comment), (OpCode.PRIM, self.code)]
+
+class AMCirclePrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        exposure = 'on' if modifiers[0] == 1 else 'off',
+        diameter = modifiers[1],
+        center_x = modifiers[2],
+        center_y = modifiers[3],
+        rotation = modifiers[4]
+        return cls(code, expressions, center_x, center_y, rotation)
+
+    def __init__(self, code, exposure, diameter, center_x, center_y, rotation):
+        super(AMCirclePrimitiveDef, self).__init__(code, exposure, rotation)
+        self.diameter = diameter
+        self.center_x = center_x
+        self.center_y = center_y
+
+    def to_inch(self):
+        self.diameter = self.diameter.to_inch().optimize()
+        self.center_x = self.center_x.to_inch().optimize()
+        self.center_y = self.center_y.to_inch().optimize()
+    
+    def to_metric(self):
+        self.diameter = self.diameter.to_metric().optimize()
+        self.center_x = self.center_x.to_metric().optimize()
+        self.center_y = self.center_y.to_metric().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    exposure = 1 if self.exposure == 'on' else 0,
+                    diameter = self.diameter.to_gerber(settings),
+                    x = self.center_x.to_gerber(settings),
+                    y = self.center_y.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{exposure},{diameter},{x},{y},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        yield (OpCode.PUSH, 1 if self.exposure == 'on' else 0)
+        for modifier in [self.diameter, self.center_x, self.center_y, self.rotation]:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMVectorLinePrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        code = code
+        exposure = 'on' if modifiers[0] == 1 else 'off'
+        width = modifiers[1]
+        start_x = modifiers[2]
+        start_y = modifiers[3]
+        end_x = modifiers[4]
+        end_y = modifiers[5]
+        rotation = modifiers[6]
+        return cls(code, exposure, width, start_x, start_y, end_x, end_y, rotation)
+
+    def __init__(self, code, exposure, width, start_x, start_y, end_x, end_y, rotation):
+        super(AMVectorLinePrimitiveDef, self).__init__(code, exposure, rotation)
+        self.width = width
+        self.start_x = start_x
+        self.start_y = start_y
+        self.end_x = end_x
+        self.end_y = end_y
+
+    def to_inch(self):
+        self.width = self.width.to_inch().optimize()
+        self.start_x = self.start_x.to_inch().optimize()
+        self.start_y = self.start_y.to_inch().optimize()
+        self.end_x = self.end_x.to_inch().optimize()
+        self.end_y = self.end_x.to_inch().optimize()
+    
+    def to_metric(self):
+        self.width = self.width.to_metric().optimize()
+        self.start_x = self.start_x.to_metric().optimize()
+        self.start_y = self.start_y.to_metric().optimize()
+        self.end_x = self.end_x.to_metric().optimize()
+        self.end_y = self.end_x.to_metric().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    exposure = 1 if self.exposure == 'on' else 0,
+                    width = self.width.to_gerber(settings),
+                    start_x = self.start_x.to_gerber(settings),
+                    start_y = self.start_y.to_gerber(settings),
+                    end_x = self.end_x.to_gerber(settings),
+                    end_y = self.end_y.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{exposure},{width},{start_x},{start_y},{end_x},{end_y},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        yield (OpCode.PUSH, 1 if self.exposure == 'on' else 0)
+        modifiers = [self.width, self.start_x, self.start_y, self.end_x, self.end_y, self.rotation]
+        for modifier in modifiers:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMCenterLinePrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        code = code
+        exposure = 'on' if modifiers[0] == 1 else 'off'
+        width = modifiers[1]
+        height = modifiers[2]
+        x = modifiers[3]
+        y = modifiers[4]
+        rotation = modifiers[5]
+        return cls(code, exposure, width, height, x, y, rotation)
+
+    def __init__(self, code, exposure, width, height, x, y, rotation):
+        super(AMCenterLinePrimitiveDef, self).__init__(code, exposure, rotation)
+        self.width = width
+        self.height = height
+        self.x = x
+        self.y = y
+
+    def to_inch(self):
+        self.width = self.width.to_inch().optimize()
+        self.height = self.height.to_inch().optimize()
+        self.x = self.x.to_inch().optimize()
+        self.y = self.y.to_inch().optimize()
+    
+    def to_metric(self):
+        self.width = self.width.to_metric().optimize()
+        self.height = self.height.to_metric().optimize()
+        self.x = self.x.to_metric().optimize()
+        self.y = self.y.to_metric().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    exposure = 1 if self.exposure == 'on' else 0,
+                    width = self.width.to_gerber(settings),
+                    height = self.height.to_gerber(settings),
+                    x = self.x.to_gerber(settings),
+                    y = self.y.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{exposure},{width},{height},{x},{y},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        yield (OpCode.PUSH, 1 if self.exposure == 'on' else 0)
+        modifiers = [self.width, self.height, self.x, self.y, self.rotation]
+        for modifier in modifiers:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMOutlinePrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        num_points = modifiers[1] + 1
+        code = code
+        exposure = 'on' if modifiers[0] == 1 else 'off'
+        addrs = modifiers[2:num_points * 2]
+        rotation = modifiers[3 + num_points * 2]
+        return cls(code, exposure, addrs, rotation)
+
+    def __init__(self, code, exposure, addrs, rotation):
+        super(AMOutlinePrimitiveDef, self).__init__(code, exposure, rotation)
+        self.addrs = addrs
+
+    def to_inch(self):
+        self.addrs = [i.to_inch() for i in self.addrs]
+    
+    def to_metric(self):
+        self.addrs = [i.to_metric() for i in self.addrs]
+ 
+    def to_gerber(self, settings=None):
+        def strs():
+            yield '%d,%d,%d' % (self.code, 
+                                1 if self.exposure == 'on' else 0,
+                                len(self.addrs) / 2 - 1)
+            for i in self.addrs:
+                yield i.to_gerber(settings)
+            yield self.rotation.to_gerber(settings)
+
+        return '%s*' % ','.join(strs())
+        
+    def to_instructions(self):
+        yield (OpCode.PUSH, 1 if self.exposure == 'on' else 0)
+        yield (OpCode.PUSH, int(len(self.addrs) / 2 - 1))
+        for modifier in self.addrs:
+            for i in modifier.to_instructions():
+                yield i
+        for i in self.rotation.to_instructions():
+            yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMPolygonPrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        code = code
+        exposure = 'on' if modifiers[0] == 1 else 'off'
+        vertices = modifiers[1]
+        x = modifiers[2]
+        y = modifiers[3]
+        diameter = modifiers[4]
+        rotation = modifiers[5]
+        return cls(code, exposure, vertices, x, y, diameter, rotation)
+
+    def __init__(self, code, exposure, vertices, x, y, diameter, rotation):
+        super(AMPolygonPrimitiveDef, self).__init__(code, exposure, rotation)
+        self.vertices = vertices
+        self.x = x
+        self.y = y
+        self.diameter = diameter
+
+    def to_inch(self):
+        self.x = self.x.to_inch().optimize()
+        self.y = self.y.to_inch().optimize()
+        self.diameter = self.diameter.to_inch().optimize()
+    
+    def to_metric(self):
+        self.x = self.x.to_metric().optimize()
+        self.y = self.y.to_metric().optimize()
+        self.diameter = self.diameter.to_inch().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    exposure = 1 if self.exposure == 'on' else 0,
+                    vertices = self.vertices.to_gerber(settings),
+                    x = self.x.to_gerber(settings),
+                    y = self.y.to_gerber(settings),
+                    diameter = self.diameter.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{exposure},{vertices},{x},{y},{diameter},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        yield (OpCode.PUSH, 1 if self.exposure == 'on' else 0)
+        modifiers = [self.vertices, self.x, self.y, self.diameter, self.rotation]
+        for modifier in modifiers:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMMoirePrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        code = code
+        exposure = 'on'
+        x = modifiers[0]
+        y = modifiers[1]
+        diameter = modifiers[2]
+        ring_thickness = modifiers[3]
+        gap = modifiers[4]
+        max_rings = modifiers[5]
+        crosshair_thickness = modifiers[6]
+        crosshair_length = modifiers[7]
+        rotation = modifiers[8]
+        return cls(code, exposure, x, y, diameter, ring_thickness, gap,
+                   max_rings, crosshair_thickness, crosshair_length, rotation)
+
+    def __init__(self, code, exposure, x, y, diameter, ring_thickness, gap, max_rings, crosshair_thickness, crosshair_length, rotation):
+        super(AMMoirePrimitiveDef, self).__init__(code, exposure, rotation)
+        self.x = x
+        self.y = y
+        self.diameter = diameter
+        self.ring_thickness = ring_thickness
+        self.gap = gap
+        self.max_rings = max_rings
+        self.crosshair_thickness = crosshair_thickness
+        self.crosshair_length = crosshair_length
+
+    def to_inch(self):
+        self.x = self.x.to_inch().optimize()
+        self.y = self.y.to_inch().optimize()
+        self.diameter = self.diameter.to_inch().optimize()
+        self.ring_thickness = self.ring_thickness.to_inch().optimize()
+        self.gap = self.gap.to_inch().optimize()
+        self.crosshair_thickness = self.crosshair_thickness.to_inch().optimize()
+        self.crosshair_length = self.crosshair_length.to_inch().optimize()
+    
+    def to_metric(self):
+        self.x = self.x.to_metric().optimize()
+        self.y = self.y.to_metric().optimize()
+        self.diameter = self.diameter.to_metric().optimize()
+        self.ring_thickness = self.ring_thickness.to_metric().optimize()
+        self.gap = self.gap.to_metric().optimize()
+        self.crosshair_thickness = self.crosshair_thickness.to_metric().optimize()
+        self.crosshair_length = self.crosshair_length.to_metric().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    x = self.x.to_gerber(settings),
+                    y = self.y.to_gerber(settings),
+                    diameter = self.diameter.to_gerber(settings),
+                    ring_thickness = self.ring_thickness.to_gerber(settings),
+                    gap = self.gap.to_gerber(settings),
+                    max_rings = self.max_rings.to_gerber(settings),
+                    crosshair_thickness = self.crosshair_thickness.to_gerber(settings),
+                    crosshair_length = self.crosshair_length.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{x},{y},{diameter},{ring_thickness},{gap},{max_rings},'\
+               '{crosshair_thickness},{crosshair_length},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        modifiers = [self.x, self.y, self.diameter, 
+                     self.ring_thickness, self.gap, self.max_rings,
+                     self.crosshair_thickness, self.crosshair_length,
+                     self.rotation]
+        for modifier in modifiers:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMThermalPrimitiveDef(AMPrimitiveDef):
+    @classmethod
+    def from_modifiers(cls, code, modifiers):
+        code = code
+        exposure = 'on'
+        x = modifiers[0]
+        y = modifiers[1]
+        outer_diameter = modifiers[2]
+        inner_diameter = modifiers[3]
+        gap = modifiers[4]
+        rotation = modifiers[5]
+        return cls(code, exposure, x, y, outer_diameter, inner_diameter, gap, rotation)
+
+    def __init__(self, code, exposure, x, y, outer_diameter, inner_diameter, gap, rotation):
+        super(AMThermalPrimitiveDef, self).__init__(code, exposure, rotation)
+        self.x = x
+        self.y = y
+        self.outer_diameter = outer_diameter
+        self.inner_diameter = inner_diameter
+        self.gap = gap
+
+    def to_inch(self):
+        self.x = self.x.to_inch().optimize()
+        self.y = self.y.to_inch().optimize()
+        self.outer_diameter = self.outer_diameter.to_inch().optimize()
+        self.inner_diameter = self.inner_diameter.to_inch().optimize()
+        self.gap = self.gap.to_inch().optimize()
+    
+    def to_metric(self):
+        self.x = self.x.to_metric().optimize()
+        self.y = self.y.to_metric().optimize()
+        self.outer_diameter = self.outer_diameter.to_metric().optimize()
+        self.inner_diameter = self.inner_diameter.to_metric().optimize()
+        self.gap = self.gap.to_metric().optimize()
+
+    def to_gerber(self, settings=None):
+        data = dict(code = self.code,
+                    x = self.x.to_gerber(settings),
+                    y = self.y.to_gerber(settings),
+                    outer_diameter = self.outer_diameter.to_gerber(settings),
+                    inner_diameter = self.inner_diameter.to_gerber(settings),
+                    gap = self.gap.to_gerber(settings),
+                    rotation = self.rotation.to_gerber(settings))
+        return '{code},{x},{y},{outer_diameter},{inner_diameter},'\
+               '{gap},{rotation}*'.format(**data)
+        
+    def to_instructions(self):
+        modifiers = [self.x, self.y, self.outer_diameter,
+                     self.inner_diameter, self.gap, self.rotation]
+        for modifier in modifiers:
+            for i in modifier.to_instructions():
+                yield i
+        yield (OpCode.PRIM, self.code)
+
+class AMVariableDef(object):
+    def __init__(self, number, value):
+        self.number = number
+        self.value = value
+
+    def to_inch(self):
+        return self
+    
+    def to_metric(self):
+        return self
+
+    def to_gerber(self, settings=None):
+        return '$%d=%s*' % (self.number, self.value.to_gerber(settings))
+
+    def to_instructions(self):
+        for i in self.value.to_instructions():
+            yield i
+        yield (OpCode.STORE, self.number)
+
+def to_primitive_defs(instructions):
+    classes = {
+        0: AMCommentPrimitiveDef,
+        1: AMCirclePrimitiveDef,
+        2: AMVectorLinePrimitiveDef,
+        20: AMVectorLinePrimitiveDef,
+        21: AMCenterLinePrimitiveDef,
+        4: AMOutlinePrimitiveDef,
+        5: AMPolygonPrimitiveDef,
+        6: AMMoirePrimitiveDef,
+        7: AMThermalPrimitiveDef,
+    }
+    for code, modifiers in eval_macro(instructions):
+        if code < 0:
+            yield AMVariableDef(-code, modifiers[0])
+        else:
+            primitive = classes[code]
+            yield primitive.from_modifiers(code, modifiers)
\ No newline at end of file