Mercurial > skaapsteker

annotate skaapsteker/dialogue.py @ 246:8dee25fd070d

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Fix some npc-test and dialogue bugs.
author Simon Cross <hodgestar@gmail.com>
date Thu, 07 Apr 2011 19:11:08 +0200
parents 8ea658969f47
children 432f6997d306
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1 import json
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2
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3 from . import data
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4
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5
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6 class DSM(object):
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7 """Dialogue State Machine!
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8
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9 Parameters
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10 ----------
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11 json_filename : str
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12 Path to file under data/ that contains JSON description
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13 of state machine.
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14 world : object
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15 Something to allow states to introspect the game state with.
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16 """
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17
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18 def __init__(self, name, world, json_filename, state):
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19 self.state = state
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20 self.world = world
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21 self.states = AttrDict()
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22 src = json.loads(data.load(json_filename).read())
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23 for state, state_src in src.iteritems():
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24 pseudo_path = [json_filename, state]
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25 self.states[state] = DsmState(state, state_src, pseudo_path)
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26 assert self.state in self.states, "DSM must have start state %r" % (self.state,)
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27
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28 def get_state(self):
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29 return self.states[self.state]
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30
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31 def event(self, ev):
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32 my_locals = {
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33 "state": self.states,
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34 "world": self.world,
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35 "npcs": self.world.npcs,
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36 }
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37 my_locals.update(ev.items)
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38 state = self.states[self.state]
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39 next_state = state.event(my_locals)
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40 if next_state is not None and next_state.name in self.states:
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41 self.states[self.state].leave(my_locals)
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42 self.state = next_state.name
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43 # TODO: update self.world to reflect new state?
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44 self.states[self.state].enter(my_locals)
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45
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46 def choice(self, i):
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47 self.event(DsmEvent(choice=i))
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48
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49
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50 class AttrDict(dict):
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51
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52 def __getattr__(self, name):
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53 if name not in self:
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54 raise AttributeError("No attribute %r" % (name,))
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55 return self[name]
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56
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57
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58 class DsmEvent(object):
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59
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60 def __init__(self, choice=None):
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61 self.items = {
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62 "choice": choice,
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63 }
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64
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65
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66 class DsmState(object):
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67 """State within a DSM.
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68 """
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69
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70 def __init__(self, name, state_src, base_path):
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71 self.name = name
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72 self.text = state_src.get("text", None)
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73 self.choices = []
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74 self.triggers = []
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75
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76 choices = state_src.get("choices", [])
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77 for i, choice in enumerate(choices):
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78 pseudo_path = base_path + ["choice-%d" % i]
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79 self.choices.append((i, choice["text"]))
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80 next_state_code = choice.get("next", None)
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81 if next_state_code is not None:
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82 self.triggers.append(
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83 Trigger("choice == %d" % i, next_state_code, pseudo_path))
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84
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85 events = state_src.get("events", [])
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86 for i, event in enumerate(events):
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87 pseudo_path = base_path + ["event-%d" % i]
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88 self.triggers.append(Trigger(event["matches"], event["next"],
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89 pseudo_path))
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90
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91 auto_next = state_src.get("auto_next", None)
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92 if auto_next is not None:
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93 pseudo_path = base_path + ["auto_next"]
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94 self.triggers.append(Trigger("""True""", auto_next, pseudo_path))
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95
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96 on_entry = state_src.get("on_entry", None)
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97 if on_entry is not None:
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98 self.on_entry = compile(on_entry,
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99 "<%s>" % ":".join(base_path + ["on_entry"]),
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100 "exec")
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101 else:
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102 self.on_entry = None
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103
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104 on_exit = state_src.get("on_exit", None)
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105 if on_exit is not None:
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106 self.on_exit = compile(on_exit,
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107 "<%s>" % ":".join(base_path + ["on_exit"]),
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108 "exec")
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109 else:
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110 self.on_exit = None
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111
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112 def __repr__(self):
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113 return "<%r name=%r>" % (self.__class__.__name__, self.name)
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114
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115 def event(self, my_locals):
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116 for trigger in self.triggers:
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117 next_state = trigger.fire(my_locals)
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118 if next_state is not None:
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119 return next_state
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120
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121 def enter(self, my_locals):
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122 if self.on_entry is not None:
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123 exec(self.on_entry, {}, my_locals.copy())
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124
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125 def leave(self, my_locals):
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126 if self.on_exit is not None:
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127 exec(self.on_exit, {}, my_locals.copy())
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128
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129
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130 class Trigger(object):
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131 """Matches DSM events and triggers state transitions.
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132 """
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133
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134 def __init__(self, matches_code, next_state_code, pseudo_path):
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135 self._matches = compile(matches_code,
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136 "<%s>" % ":".join(pseudo_path + ["match"]),
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137 "eval")
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138 self._next_state = compile(next_state_code,
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139 "<%s>" % ":".join(pseudo_path + ["next"]),
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140 "eval")
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141
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142 def fire(self, my_locals):
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143 if eval(self._matches, {}, my_locals.copy()):
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144 return eval(self._next_state, {}, my_locals.copy())
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145 return None