"""BulletML parser.
-http://www.asahi-net.or.jp/~cs8k-cyu/bulletml/index_e.html
+This is based on the format described at
+http://www.asahi-net.or.jp/~cs8k-cyu/bulletml/bulletml_ref_e.html.
+
+Unless you are adding support for new actions, the only class you
+should care about in here is BulletML.
"""
from __future__ import division
+from math import sin, cos, radians, pi as PI
+
from xml.etree.ElementTree import ElementTree
+# Python 3 moved this for no really good reason.
try:
- from cStringIO import StringIO
+ from sys import intern
except ImportError:
- from StringIO import StringIO
+ pass
+
+try:
+ from io import StringIO
+except ImportError:
+ try:
+ from cStringIO import StringIO
+ except ImportError:
+ from StringIO import StringIO
from bulletml.errors import Error
from bulletml.expr import NumberDef, INumberDef
+
+__all__ = ["ParseError", "BulletML"]
+
+PI_2 = PI * 2
+
class ParseError(Error):
"""Raised when an error occurs parsing the XML structure."""
pass
class ParamList(object):
"""List of parameter definitions."""
- def __init__(self, element):
- self.params = []
- if element:
- for subelem in element:
- if realtag(subelem) == "param":
- self.params.append(NumberDef(subelem.text))
+
+ def __init__(self, params=()):
+ self.params = list(params)
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls([NumberDef(subelem.text) for subelem in element
+ if realtag(subelem) == "param"])
def __call__(self, params, rank):
- new_params = [param(params, rank) for param in self.params]
- while len(new_params) < len(params):
- new_params.append(params[len(new_params)])
- return new_params
+ return [param(params, rank) for param in self.params]
def __repr__(self):
return "%s(%r)" % (type(self).__name__, self.params)
class Direction(object):
"""Raw direction value."""
- def __init__(self, doc, element, type="absolute"):
- self.type = element.get("type", type)
- self.value = NumberDef(element.text)
+ VALID_TYPES = ["relative", "absolute", "aim", "sequence"]
+
+ def __init__(self, type, value):
+ if type not in self.VALID_TYPES:
+ raise ValueError("invalid type %r" % type)
+ self.type = intern(type)
+ self.value = value
+
+ def __getstate__(self):
+ return [('type', self.type), ('value', self.value.expr)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(state["type"], NumberDef(state["value"]))
+
+ @classmethod
+ def FromXML(cls, doc, element, default="absolute"):
+ """Construct using an ElementTree-style element."""
+ return cls(element.get("type", default), NumberDef(element.text))
def __call__(self, params, rank):
- return (self.value(params, rank), self.type)
+ return (radians(self.value(params, rank)), self.type)
def __repr__(self):
return "%s(%r, type=%r)" % (
class ChangeDirection(object):
"""Direction change over time."""
- def __init__(self, doc, element):
+ def __init__(self, term, direction):
+ self.term = term
+ self.direction = direction
+
+ def __getstate__(self):
+ return [('frames', self.term.expr),
+ ('type', self.direction.type),
+ ('value', self.direction.value.expr)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(INumberDef(state["frames"]),
+ Direction(state["type"], NumberDef(state["value"])))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "direction":
- self.direction = Direction(doc, subelem)
+ direction = Direction.FromXML(doc, subelem)
elif tag == "term":
- self.term = INumberDef(subelem.text)
+ term = INumberDef(subelem.text)
try:
- self.term, self.direction
- except AttributeError:
- raise ParseError
+ return cls(term, direction)
+ except UnboundLocalError as exc:
+ raise ParseError(str(exc))
- def __call__(self, params, rank):
- return self.term(params, rank), self.direction(params, rank)
+ def __call__(self, owner, action, params, rank, created):
+ frames = self.term(params, rank)
+ direction, type = self.direction(params, rank)
+ action.direction_frames = frames
+ action.aiming = False
+ if type == "sequence":
+ action.direction = direction
+ else:
+ if type == "absolute":
+ direction -= owner.direction
+ elif type != "relative": # aim or default
+ action.aiming = True
+ direction += owner.aim - owner.direction
+
+ # Normalize to [-pi, pi).
+ direction = (direction + PI) % PI_2 - PI
+ if frames <= 0:
+ owner.direction += direction
+ else:
+ action.direction = direction / frames
def __repr__(self):
return "%s(term=%r, direction=%r)" % (
class Speed(object):
"""Raw speed value."""
- def __init__(self, doc, element, type="absolute"):
- self.type = element.get("type", type)
- self.value = NumberDef(element.text)
+ VALID_TYPES = ["relative", "absolute", "sequence"]
+
+ def __init__(self, type, value):
+ if type not in self.VALID_TYPES:
+ raise ValueError("invalid type %r" % type)
+ self.type = intern(type)
+ self.value = value
+
+ def __getstate__(self):
+ return [('type', self.type), ('value', self.value.expr)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(state["type"], NumberDef(state["value"]))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls(element.get("type", "absolute"), NumberDef(element.text))
def __call__(self, params, rank):
return (self.value(params, rank), self.type)
class ChangeSpeed(object):
"""Speed change over time."""
- def __init__(self, doc, element):
+ def __init__(self, term, speed):
+ self.term = term
+ self.speed = speed
+
+ def __getstate__(self):
+ return [('frames', self.term.expr),
+ ('type', self.speed.type),
+ ('value', self.speed.value.expr)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(INumberDef(state["frames"]),
+ Speed(state["type"], NumberDef(state["value"])))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "speed":
- self.speed = Speed(doc, subelem)
+ speed = Speed.FromXML(doc, subelem)
elif tag == "term":
- self.term = INumberDef(subelem.text)
+ term = INumberDef(subelem.text)
try:
- self.term, self.speed
- except AttributeError:
- raise ParseError
+ return cls(term, speed)
+ except UnboundLocalError as exc:
+ raise ParseError(str(exc))
- def __call__(self, params, rank):
- return self.term(params, rank), self.speed(params, rank)
+ def __call__(self, owner, action, params, rank, created):
+ frames = self.term(params, rank)
+ speed, type = self.speed(params, rank)
+ action.speed_frames = frames
+ if frames <= 0:
+ if type == "absolute":
+ owner.speed = speed
+ elif type == "relative":
+ owner.speed += speed
+ elif type == "sequence":
+ action.speed = speed
+ elif type == "relative":
+ action.speed = speed / frames
+ else:
+ action.speed = (speed - owner.speed) / frames
def __repr__(self):
return "%s(term=%r, speed=%r)" % (
class Wait(object):
"""Wait for some frames."""
- def __init__(self, doc, element):
- self.frames = INumberDef(element.text)
- def __call__(self, params, rank):
- return self.frames(params, rank)
+ def __init__(self, frames):
+ self.frames = frames
+
+ def __getstate__(self):
+ return dict(frames=self.frames.expr)
+
+ def __setstate__(self, state):
+ self.__init__(INumberDef(state["frames"]))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls(INumberDef(element.text))
+
+ def __call__(self, owner, action, params, rank, created):
+ action.wait_frames = self.frames(params, rank)
+ return True
def __repr__(self):
return "%s(%r)" % (type(self).__name__, self.frames)
+class Tag(object):
+ """Set a bullet tag."""
+
+ def __init__(self, tag):
+ self.tag = tag
+
+ def __getstate__(self):
+ return dict(tag=self.tag)
+
+ def __setstate__(self, state):
+ self.__init__(state["tag"])
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls(element.text)
+
+ def __call__(self, owner, action, params, rank, created):
+ owner.tags.add(self.tag)
+
+class Untag(object):
+ """Unset a bullet tag."""
+
+ def __init__(self, tag):
+ self.tag = tag
+
+ def __getstate__(self):
+ return dict(tag=self.tag)
+
+ def __setstate__(self, state):
+ self.__init__(state["tag"])
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls(element.text)
+
+ def __call__(self, owner, action, params, rank, created):
+ try:
+ owner.tags.remove(self.tag)
+ except KeyError:
+ pass
+
+class Appearance(object):
+ """Set a bullet appearance."""
+
+ def __init__(self, appearance):
+ self.appearance = appearance
+
+ def __getstate__(self):
+ return dict(appearance=self.appearance)
+
+ def __setstate__(self, state):
+ self.__init__(state["appearance"])
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls(element.text)
+
+ def __call__(self, owner, action, params, rank, created):
+ owner.apearance = self.appearance
+
class Vanish(object):
"""Make the owner disappear."""
- def __init__(self, doc, element):
+
+ def __init__(self):
pass
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ return cls()
+
def __repr__(self):
return "%s()" % (type(self).__name__)
+ def __call__(self, owner, action, params, rank, created):
+ owner.vanish()
+ return True
+
class Repeat(object):
"""Repeat an action definition."""
- def __init__(self, doc, element):
+ def __init__(self, times, action):
+ self.times = times
+ self.action = action
+
+ def __getstate__(self):
+ return [('times', self.times.expr), ('action', self.action)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(INumberDef(state["times"]), state["action"])
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "times":
- self.times = INumberDef(subelem.text)
+ times = INumberDef(subelem.text)
elif tag == "action":
- self.action = ActionDef(doc, subelem)
+ action = ActionDef.FromXML(doc, subelem)
elif tag == "actionRef":
- self.action = ActionRef(doc, subelem)
-
+ action = ActionRef.FromXML(doc, subelem)
try:
- self.times, self.action
- except AttributeError:
- raise ParseError
-
- def __call__(self, params, rank):
- return self.times(params, rank), self.action(params, rank)
+ return cls(times, action)
+ except UnboundLocalError as exc:
+ raise ParseError(str(exc))
+
+ def __call__(self, owner, action, params, rank, created):
+ repeat = self.times(params, rank)
+ actions, params = self.action(params, rank)
+ child = action.Child(actions, params, rank, repeat)
+ owner.replace(action, child)
+ child.step(owner, created)
+ return True
def __repr__(self):
return "%s(%r, %r)" % (type(self).__name__, self.times, self.action)
+class If(object):
+ """Conditional actions."""
+
+ def __init__(self, cond, then, else_=None):
+ self.cond = cond
+ self.then = then
+ self.else_ = else_
+
+ def __getstate__(self):
+ if self.else_:
+ return [('cond', self.cond.expr),
+ ('then', self.then),
+ ('else', self.else_)]
+ else:
+ return [('cond', self.cond.expr), ('then', self.then)]
+
+ def __setstate__(self, state):
+ state = dict(state)
+ state["else_"] = state.pop("else", None)
+ state["cond"] = INumberDef(state["cond"])
+ self.__init__(**state)
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ else_ = None
+ for subelem in element.getchildren():
+ tag = realtag(subelem)
+ if tag == "cond":
+ cond = INumberDef(subelem.text)
+ elif tag == "then":
+ then = ActionDef.FromXML(doc, subelem)
+ elif tag == "else":
+ else_ = ActionDef.FromXML(doc, subelem)
+ try:
+ return cls(cond, then, else_)
+ except UnboundLocalError as exc:
+ raise ParseError(str(exc))
+
+ def __call__(self, owner, action, params, rank, created):
+ if self.cond(params, rank):
+ branch = self.then
+ else:
+ branch = self.else_
+
+ if branch:
+ actions, params = branch(params, rank)
+ child = action.Child(actions, params, rank)
+ owner.replace(action, child)
+ child.step(owner, created)
+ return True
+
class Accel(object):
"""Accelerate over some time."""
horizontal = None
vertical = None
- def __init__(self, doc, element):
+ def __init__(self, term, horizontal=None, vertical=None):
+ self.term = term
+ self.horizontal = horizontal
+ self.vertical = vertical
+
+ def __getstate__(self):
+ state = [('frames', self.term.expr)]
+ if self.horizontal:
+ state.append(('horizontal', self.horizontal))
+ if self.vertical:
+ state.append(('vertical', self.vertical))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(INumberDef(state["frames"]), state.get("horizontal"),
+ state.get("vertical"))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ horizontal = None
+ vertical = None
+
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "term":
- self.term = INumberDef(subelem.text)
+ term = INumberDef(subelem.text)
elif tag == "horizontal":
- self.horizontal = Speed(doc, subelem)
+ horizontal = Speed.FromXML(doc, subelem)
elif tag == "vertical":
- self.vertical = Speed(doc, subelem)
+ vertical = Speed.FromXML(doc, subelem)
try:
- self.term
+ return cls(term, horizontal, vertical)
except AttributeError:
raise ParseError
- def __call__(self, params, rank):
+ def __call__(self, owner, action, params, rank, created):
frames = self.term(params, rank)
- horizontal = self.horizontal and (
- self.horizontal(params, rank), self.horizontal.type)
- vertical = self.vertical and (
- self.vertical(params, rank), self.vertical.type)
- return frames, horizontal, vertical
+ horizontal = self.horizontal and self.horizontal(params, rank)
+ vertical = self.vertical and self.vertical(params, rank)
+ action.accel_frames = frames
+ if horizontal:
+ mx, type = horizontal
+ if frames <= 0:
+ if type == "absolute":
+ owner.mx = mx
+ elif type == "relative":
+ owner.mx += mx
+ elif type == "sequence":
+ action.mx = mx
+ elif type == "absolute":
+ action.mx = (mx - owner.mx) / frames
+ elif type == "relative":
+ action.mx = mx / frames
+ if vertical:
+ my, type = vertical
+ if frames <= 0:
+ if type == "absolute":
+ owner.my = my
+ elif type == "relative":
+ owner.my += my
+ elif type == "sequence":
+ action.my = my
+ elif type == "absolute":
+ action.my = (my - owner.my) / frames
+ elif type == "relative":
+ action.my = my / frames
def __repr__(self):
return "%s(%r, horizontal=%r, vertical=%r)" % (
class BulletDef(object):
"""Bullet definition."""
- direction = None
- speed = None
+ def __init__(self, actions=(), direction=None, speed=None, tags=(),
+ appearance=None):
+ self.direction = direction
+ self.speed = speed
+ self.actions = list(actions)
+ self.tags = set(tags)
+ self.appearance = appearance
- def __init__(self, doc, element):
- self.actions = []
- doc.bullets[element.get("label")] = self
+ def __getstate__(self):
+ state = []
+ if self.direction:
+ state.append(("direction", self.direction))
+ if self.speed:
+ state.append(("speed", self.speed))
+ if self.actions:
+ state.append(("actions", self.actions))
+ if self.tags:
+ state.append(("tags", list(self.tags)))
+ if self.appearance:
+ state.append(("appearance", self.appearance))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(**state)
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ actions = []
+ speed = None
+ direction = None
+ tags = set()
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "direction":
- self.direction = Direction(doc, subelem)
+ direction = Direction.FromXML(doc, subelem)
elif tag == "speed":
- self.speed = Speed(doc, subelem)
+ speed = Speed.FromXML(doc, subelem)
elif tag == "action":
- self.actions.append(ActionDef(doc, element))
+ actions.append(ActionDef.FromXML(doc, subelem))
elif tag == "actionRef":
- self.actions.append(ActionRef(doc, element))
+ actions.append(ActionRef.FromXML(doc, subelem))
+ elif tag == "tag":
+ tags.add(subelem.text)
+ dfn = cls(actions, direction, speed, tags)
+ doc._bullets[element.get("label")] = dfn
+ return dfn
def __call__(self, params, rank):
- actions = []
- for action in self.actions:
- actions.append(action(params, rank))
+ actions = [action(params, rank) for action in self.actions]
return (
self.direction and self.direction(params, rank),
self.speed and self.speed(params, rank),
+ self.tags,
+ self.appearance,
actions)
def __repr__(self):
class BulletRef(object):
"""Create a bullet by name with parameters."""
- def __init__(self, doc, element):
- self.bullet = element.get("label")
- self.params = ParamList(element)
- doc._bullet_refs.append(self)
+ def __init__(self, bullet, params=None):
+ self.bullet = bullet
+ self.params = ParamList() if params is None else params
+
+ def __getstate__(self):
+ state = []
+ if self.params.params:
+ params = [param.expr for param in self.params.params]
+ state.append(("params", params))
+ state.append(('bullet', self.bullet))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ bullet = state["bullet"]
+ params = [NumberDef(param) for param in state.get("params", [])]
+ self.__init__(bullet, ParamList(params))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ bullet = cls(element.get("label"), ParamList.FromXML(doc, element))
+ doc._bullet_refs.append(bullet)
+ return bullet
def __call__(self, params, rank):
return self.bullet(self.params(params, rank), rank)
type(self).__name__, self.params, self.bullet)
class ActionDef(object):
- """Action definition."""
+ """Action definition.
+
+ To support parsing new actions, add tags to
+ ActionDef.CONSTRUCTORS. It maps tag names to classes with a
+ FromXML classmethod, which take the BulletML instance and
+ ElementTree element as arguments.
+ """
+
+ # This is self-referential, so it's filled in later.
+ CONSTRUCTORS = dict()
+
+ def __init__(self, actions):
+ self.actions = list(actions)
+
+ def __getstate__(self):
+ return dict(actions=self.actions)
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(state["actions"])
- def __init__(self, doc, element):
- doc.actions[element.get("label")] = self
- self.actions = []
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ actions = []
for subelem in element.getchildren():
tag = realtag(subelem)
try:
- ctr = dict(
- repeat=Repeat,
- fire=FireDef,
- fireRef=FireRef,
- changeSpeed=ChangeSpeed,
- changeDirection=ChangeDirection,
- accel=Accel,
- wait=Wait,
- vanish=Vanish,
- action=ActionDef,
- actionRef=ActionRef)[tag]
+ ctr = cls.CONSTRUCTORS[tag]
except KeyError:
continue
else:
- self.actions.append(ctr(doc, subelem))
+ actions.append(ctr.FromXML(doc, subelem))
+ dfn = cls(actions)
+ doc._actions[element.get("label")] = dfn
+ return dfn
def __call__(self, params, rank):
return self.actions, params
class ActionRef(object):
"""Run an action by name with parameters."""
- def __init__(self, doc, element):
- self.action = element.get("label")
- self.params = ParamList(element)
- doc._action_refs.append(self)
+ def __init__(self, action, params=None):
+ self.action = action
+ self.params = params or ParamList()
+
+ def __getstate__(self):
+ state = []
+ if self.params.params:
+ params = [param.expr for param in self.params.params]
+ state.append(("params", params))
+ state.append(('action', self.action))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ action = state["action"]
+ params = [NumberDef(param) for param in state.get("params", [])]
+ self.__init__(action, ParamList(params))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ action = cls(element.get("label"), ParamList.FromXML(doc, element))
+ doc._action_refs.append(action)
+ return action
def __call__(self, params, rank):
return self.action(self.params(params, rank), rank)
return "%s(params=%r, action=%r)" % (
type(self).__name__, self.params, self.action)
+class Offset(object):
+ """Provide an offset to a bullet's initial position."""
+
+ VALID_TYPES = ["relative", "absolute"]
+
+ def __init__(self, type, x, y):
+ if type not in self.VALID_TYPES:
+ raise ValueError("invalid type %r" % type)
+ self.type = intern(type)
+ self.x = x
+ self.y = y
+
+ def __getstate__(self):
+ state = [('type', self.type)]
+ if self.x:
+ state.append(('x', self.x.expr))
+ if self.y:
+ state.append(('y', self.y.expr))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ x = NumberDef(state["x"]) if "x" in state else None
+ y = NumberDef(state["y"]) if "y" in state else None
+ self.__init__(state["type"], x, y)
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ type = element.get("type", "relative")
+ x = None
+ y = None
+ for subelem in element:
+ tag = realtag(subelem)
+ if tag == "x":
+ x = NumberDef(subelem.text)
+ elif tag == "y":
+ y = NumberDef(subelem.text)
+ return cls(type, x, y)
+
+ def __call__(self, params, rank):
+ return (self.x(params, rank) if self.x else 0,
+ self.y(params, rank) if self.y else 0)
+
class FireDef(object):
"""Fire definition (creates a bullet)."""
- direction = None
- speed = None
+ def __init__(self, bullet, direction=None, speed=None, offset=None,
+ tags=(), appearance=None):
+ self.bullet = bullet
+ self.direction = direction
+ self.speed = speed
+ self.offset = offset
+ self.tags = set(tags)
+ self.appearance = appearance
+
+ def __getstate__(self):
+ state = []
+ if self.direction:
+ state.append(("direction", self.direction))
+ if self.speed:
+ state.append(("speed", self.speed))
+ if self.offset:
+ state.append(("offset", self.offset))
+ if self.tags:
+ state.append(("tags", list(self.tags)))
+ if self.appearance:
+ state.append(("appearance", self.appearance))
+ try:
+ params = self.bullet.params
+ except AttributeError:
+ state.append(('bullet', self.bullet))
+ else:
+ if params.params:
+ state.append(('bullet', self.bullet))
+ else:
+ # Strip out empty BulletRefs.
+ state.append(('bullet', self.bullet.bullet))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(**state)
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ direction = None
+ speed = None
+ offset = None
+ tags = set()
+ appearance = None
- def __init__(self, doc, element):
- doc.fires[element.get("label")] = self
for subelem in element.getchildren():
tag = realtag(subelem)
if tag == "direction":
- self.direction = Direction(doc, subelem)
+ direction = Direction.FromXML(doc, subelem, "aim")
elif tag == "speed":
- self.speed = Speed(doc, subelem)
+ speed = Speed.FromXML(doc, subelem)
elif tag == "bullet":
- self.bullet = BulletDef(doc, subelem)
+ bullet = BulletDef.FromXML(doc, subelem)
elif tag == "bulletRef":
- self.bullet = BulletRef(doc, subelem)
+ bullet = BulletRef.FromXML(doc, subelem)
+ elif tag == "offset":
+ offset = Offset.FromXML(doc, subelem)
+ elif tag == "tag":
+ tags.add(subelem.text)
+ elif tag == "appearance":
+ appearance = subelem.text
try:
- self.bullet
- except AttributeError:
- raise ParseError
-
- def __call__(self, params, rank):
- direction, speed, actions = self.bullet(params, rank)
+ fire = cls(bullet, direction, speed, offset, tags, appearance)
+ except UnboundLocalError as exc:
+ raise ParseError(str(exc))
+ else:
+ doc._fires[element.get("label")] = fire
+ return fire
+
+ def __call__(self, owner, action, params, rank, created):
+ direction, speed, tags, appearance, actions = self.bullet(params, rank)
if self.direction:
direction = self.direction(params, rank)
if self.speed:
speed = self.speed(params, rank)
- return direction, speed, actions
+ tags = tags.union(self.tags)
+ if self.appearance:
+ appearance = self.appearance
+
+ if direction:
+ direction, type = direction
+ if type == "aim" or type is None:
+ direction += owner.aim
+ elif type == "sequence":
+ direction += action.previous_fire_direction
+ elif type == "relative":
+ direction += owner.direction
+ else:
+ direction = owner.aim
+ action.previous_fire_direction = direction
+
+ if speed:
+ speed, type = speed
+ if type == "sequence":
+ speed += action.previous_fire_speed
+ elif type == "relative":
+ # The reference Noiz implementation uses
+ # prvFireSpeed here, but the standard is
+ # pretty clear -- "In case of the type is
+ # "relative", ... the speed is relative to the
+ # speed of this bullet."
+ speed += owner.speed
+ else:
+ speed = 1
+ action.previous_fire_speed = speed
+
+ x, y = owner.x, owner.y
+ if self.offset:
+ off_x, off_y = self.offset(params, rank)
+ if self.offset.type == "relative":
+ s = sin(direction)
+ c = cos(direction)
+ x += c * off_x + s * off_y
+ y += s * off_x - c * off_y
+ else:
+ x += off_x
+ y += off_y
+
+ if appearance is None:
+ appearance = owner.appearance
+ bullet = owner.__class__(
+ x=x, y=y, direction=direction, speed=speed,
+ target=owner.target, actions=actions, rank=rank,
+ appearance=appearance, tags=tags, Action=action.__class__)
+ created.append(bullet)
def __repr__(self):
return "%s(direction=%r, speed=%r, bullet=%r)" % (
class FireRef(object):
"""Fire a bullet by name with parameters."""
- def __init__(self, doc, element):
- self.fire = element.get("label")
- self.params = ParamList(element)
- doc._fire_refs.append(self)
-
- def __call__(self, params, rank):
- """Generate a Bullet from the FireDef and params."""
- return self.fire(self.params(params, rank), rank)
+ def __init__(self, fire, params=None):
+ self.fire = fire
+ self.params = params or ParamList()
+
+ def __getstate__(self):
+ state = []
+ if self.params.params:
+ params = [param.expr for param in self.params.params]
+ state.append(("params", params))
+ state.append(('fire', self.fire))
+ return state
+
+ def __setstate__(self, state):
+ state = dict(state)
+ fire = state["fire"]
+ params = [NumberDef(param) for param in state.get("params", [])]
+ self.__init__(fire, ParamList(params))
+
+ @classmethod
+ def FromXML(cls, doc, element):
+ """Construct using an ElementTree-style element."""
+ fired = cls(element.get("label"), ParamList.FromXML(doc, element))
+ doc._fire_refs.append(fired)
+ return fired
+
+ def __call__(self, owner, action, params, rank, created):
+ params = self.params(params, rank)
+ return self.fire(owner, action, params, rank, created)
def __repr__(self):
return "%s(params=%r, fire=%r)" % (
class BulletML(object):
"""BulletML document.
- A BulletML document is a collection of bullets, actions, and
- firings, as well as a base game type.
+ A BulletML document is a collection of top-level actions and the
+ base game type.
+
+ You can add tags to the BulletML.CONSTRUCTORS dictionary to extend
+ its parsing. It maps tag names to classes with a FromXML
+ classmethod, which take the BulletML instance and ElementTree
+ element as arguments.
+
"""
CONSTRUCTORS = dict(
fire=FireDef,
)
- def __init__(self, source):
- self.bullets = {}
- self.actions = {}
- self.fires = {}
+ def __init__(self, type="none", actions=None):
+ self.type = intern(type)
+ self.actions = [] if actions is None else actions
+
+ def __getstate__(self):
+ return [('type', self.type), ('actions', self.actions)]
- self._bullet_refs = []
- self._action_refs = []
- self._fire_refs = []
+ def __setstate__(self, state):
+ state = dict(state)
+ self.__init__(state["type"], actions=state.get("actions"))
- if isinstance(source, (str, unicode)):
+ @classmethod
+ def FromXML(cls, source):
+ """Return a BulletML instance based on XML."""
+ if not hasattr(source, 'read'):
source = StringIO(source)
tree = ElementTree()
root = tree.parse(source)
- self.type = root.get("type", "none")
+ doc = cls(type=root.get("type", "none"))
+
+ doc._bullets = {}
+ doc._actions = {}
+ doc._fires = {}
+ doc._bullet_refs = []
+ doc._action_refs = []
+ doc._fire_refs = []
for element in root.getchildren():
tag = realtag(element)
- if tag in self.CONSTRUCTORS:
- self.CONSTRUCTORS[tag](self, element)
+ if tag in doc.CONSTRUCTORS:
+ doc.CONSTRUCTORS[tag].FromXML(doc, element)
try:
- for ref in self._bullet_refs:
- ref.bullet = self.bullets[ref.bullet]
- for ref in self._fire_refs:
- ref.fire = self.fires[ref.fire]
- for ref in self._action_refs:
- ref.action = self.actions[ref.action]
+ for ref in doc._bullet_refs:
+ ref.bullet = doc._bullets[ref.bullet]
+ for ref in doc._fire_refs:
+ ref.fire = doc._fires[ref.fire]
+ for ref in doc._action_refs:
+ ref.action = doc._actions[ref.action]
except KeyError as exc:
raise ParseError("unknown reference %s" % exc)
- del(self._bullet_refs)
- del(self._action_refs)
- del(self._fire_refs)
+ doc.actions = [act for name, act in doc._actions.items()
+ if name and name.startswith("top")]
- @property
- def top(self):
- """Get a list of all top-level actions."""
- return [dfn for name, dfn in self.actions.iteritems()
- if name and name.startswith("top")]
+ del(doc._bullet_refs)
+ del(doc._action_refs)
+ del(doc._fire_refs)
+ del(doc._bullets)
+ del(doc._actions)
+ del(doc._fires)
+
+ return doc
+
+ @classmethod
+ def FromYAML(cls, source):
+ """Create a BulletML instance based on YAML."""
+
+ # Late import to avoid a circular dependency.
+ try:
+ import bulletml.bulletyaml
+ import yaml
+ except ImportError:
+ raise ParseError("PyYAML is not available")
+ else:
+ try:
+ return yaml.load(source)
+ except Exception as exc:
+ raise ParseError(str(exc))
+
+ @classmethod
+ def FromDocument(cls, source):
+ """Create a BulletML instance based on a seekable file or string.
+
+ This attempts to autodetect if the stream is XML or YAML.
+ """
+ if not hasattr(source, 'read'):
+ source = StringIO(source)
+ start = source.read(1)
+ source.seek(0)
+ if start == "<":
+ return cls.FromXML(source)
+ elif start == "!" or start == "#":
+ return cls.FromYAML(source)
+ else:
+ raise ParseError("unknown initial character %r" % start)
def __repr__(self):
- return "%s(type=%r, bullets=%r, actions=%r, fires=%r)" % (
- type(self).__name__, self.type, self.bullets, self.actions,
- self.fires)
+ return "%s(type=%r, actions=%r)" % (
+ type(self).__name__, self.type, self.actions)
+
+ActionDef.CONSTRUCTORS = dict(
+ repeat=Repeat,
+ fire=FireDef,
+ fireRef=FireRef,
+ changeSpeed=ChangeSpeed,
+ changeDirection=ChangeDirection,
+ accel=Accel,
+ wait=Wait,
+ vanish=Vanish,
+ tag=Tag,
+ appearance=Appearance,
+ untag=Untag,
+ action=ActionDef,
+ actionRef=ActionRef)
+ActionDef.CONSTRUCTORS["if"] = If
projects / python-bulletml.git / blobdiff