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annotate skaapsteker/dialogue.py @ 476:1c05b6c2b971

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Start of drop item support.
author Simon Cross <hodgestar@gmail.com>
date Sat, 09 Apr 2011 21:55:45 +0200
parents 45755c143813
children b48c194c4af9
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rev   line source
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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 from .engine import OpenDialog
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5
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6
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7 class DSM(object):
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8 """Dialogue State Machine!
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9
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10 Parameters
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11 ----------
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12 json_filename : str
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13 Path to file under data/ that contains JSON description
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14 of state machine.
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15 world : object
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16 Something to allow states to introspect the game state with.
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17 """
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18
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19 def __init__(self, name, world, json_filename, state):
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20 self.name = name
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21 self.state = state
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22 self.world = world
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23 self._me = getattr(self.world.npcs, name)
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24 self.states = AttrDict()
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25 src = json.loads(data.load(json_filename).read())
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26 for state, state_src in src.iteritems():
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27 pseudo_path = [json_filename, state]
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28 self.states[state] = DsmState(state, state_src, pseudo_path)
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29 assert self.state in self.states, "DSM must have start state %r" % (self.state,)
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30
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31 def get_state(self):
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32 return self.states[self.state]
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33
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34 def has_text(self):
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35 self.poke()
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36 return bool(self.states[self.state].text)
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37
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38 def _switch_dialogue_to(self, npc_name):
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39 """Switch dialogue to another npc."""
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40 OpenDialog.post(npc_name)
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41
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42 def _drop_item(self, item):
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43 """Create a tail of the given type."""
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44 print "Dropping", item
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45 self.world.get_item(item, to_level=self._me.level)
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46
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47 def event(self, ev):
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48 my_locals = {
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49 "state": self.states,
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50 "world": self.world,
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51 "npcs": self.world.npcs,
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52 "switch_to": self._switch_dialogue_to,
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53 "drop_item": self._drop_item,
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54 }
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55 my_locals.update(ev.items)
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56 state = self.states[self.state]
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57 next_state = state.event(my_locals)
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58 if next_state is not None and next_state.name in self.states:
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59 self.states[self.state].leave(my_locals)
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60 self.state = next_state.name
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61 self._me.state = self.state
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62 self.states[self.state].enter(my_locals)
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63
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64 def choice(self, i):
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65 self.event(DsmEvent(choice=i))
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66
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67 def auto_next(self):
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68 self.event(DsmEvent(auto_next=True))
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69
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70 def poke(self):
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71 # poke the current state to see if it feels like making
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72 # a transition.
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73 self.event(DsmEvent(poke=True))
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74
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75
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76 class AttrDict(dict):
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77
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78 def __getattr__(self, name):
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79 if name not in self:
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80 raise AttributeError("No attribute %r" % (name,))
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81 return self[name]
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82
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83
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84 class DsmEvent(object):
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85
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86 def __init__(self, choice=None, auto_next=False, poke=False):
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87 self.items = {
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88 "choice": choice,
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89 "auto_next": auto_next,
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90 "poke": poke,
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91 }
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92
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93
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94 class DsmState(object):
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95 """State within a DSM.
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96 """
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97
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98 def __init__(self, name, state_src, base_path):
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99 self.name = name
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100 self.text = state_src.get("text", None)
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101 self.choices = []
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102 self.triggers = []
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103
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104 choices = state_src.get("choices", [])
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105 for i, choice in enumerate(choices):
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106 pseudo_path = base_path + ["choice-%d" % i]
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107 self.choices.append((i, choice["text"]))
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108 next_state_code = choice.get("next", None)
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109 if next_state_code is not None:
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110 self.triggers.append(
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111 Trigger("choice == %d" % i, next_state_code, pseudo_path))
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112
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113 events = state_src.get("events", [])
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114 for i, event in enumerate(events):
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115 pseudo_path = base_path + ["event-%d" % i]
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116 self.triggers.append(Trigger(event["matches"], event["next"],
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117 pseudo_path))
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118
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119 auto_next = state_src.get("auto_next", None)
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120 self.auto_next_text = state_src.get("auto_next_text", None)
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121 self.auto_next = False
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122 if auto_next is not None:
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123 self.auto_next = True
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124 assert not self.choices, "%s: auto_next and choices are not compatible" % ":".join(base_path)
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125 pseudo_path = base_path + ["auto_next"]
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126 self.triggers.append(Trigger("""auto_next""", auto_next, pseudo_path))
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127
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128 on_entry = state_src.get("on_entry", None)
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129 if on_entry is not None:
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130 self.on_entry = compile(on_entry,
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131 "<%s>" % ":".join(base_path + ["on_entry"]),
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132 "exec")
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133 else:
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134 self.on_entry = None
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135
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136 on_exit = state_src.get("on_exit", None)
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137 if on_exit is not None:
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138 self.on_exit = compile(on_exit,
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139 "<%s>" % ":".join(base_path + ["on_exit"]),
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140 "exec")
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141 else:
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142 self.on_exit = None
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143
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144 def __repr__(self):
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145 return "<%r name=%r>" % (self.__class__.__name__, self.name)
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146
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147 def event(self, my_locals):
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148 for trigger in self.triggers:
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149 next_state = trigger.fire(my_locals)
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150 if next_state is not None:
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151 return next_state
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152
216
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153 def enter(self, my_locals):
233
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154 if self.on_entry is not None:
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155 exec(self.on_entry, {}, my_locals.copy())
216
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156
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157 def leave(self, my_locals):
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158 if self.on_exit is not None:
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159 exec(self.on_exit, {}, my_locals.copy())
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160
153
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161
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162 class Trigger(object):
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163 """Matches DSM events and triggers state transitions.
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164 """
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165
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166 def __init__(self, matches_code, next_state_code, pseudo_path):
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167 self._matches = compile(matches_code,
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168 "<%s>" % ":".join(pseudo_path + ["match"]),
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169 "eval")
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170 self._next_state = compile(next_state_code,
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171 "<%s>" % ":".join(pseudo_path + ["next"]),
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172 "eval")
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173
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174 def fire(self, my_locals):
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175 if eval(self._matches, {}, my_locals.copy()):
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176 return eval(self._next_state, {}, my_locals.copy())
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177 return None