Mercurial > skaapsteker

annotate skaapsteker/dialogue.py @ 596:a1ca84c797fb

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Drop trailing colon
author Stefano Rivera <stefano@rivera.za.net>
date Sun, 10 Apr 2011 19:44:20 +0200
parents e648501c2eea
children a91b2e4400a5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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, AddSpriteEvent, ChangeScene
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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(), encoding='utf-8')
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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, shift=(1, 0)):
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43 """Create a tail of the given type."""
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44 to_level = self._me.level
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45 to_pos = self._me.pos
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46 to_pos = to_pos[0] + shift[0], to_pos[1] + shift[1]
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47 gamestate = self.world.gamestate()
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48 sprite = gamestate.create_item_sprite(item, to_level=to_level, to_pos=to_pos)
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49 AddSpriteEvent.post(sprite)
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50
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51 def _end_game(self):
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52 """End the game"""
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53 from .cutscene import VictoryCutScene
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54 ChangeScene.post(VictoryCutScene(None, None))
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55
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56 def _make_locals(self):
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57 my_locals = {
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58 "state": self.states,
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59 "world": self.world,
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60 "npcs": self.world.npcs,
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61 "switch_to": self._switch_dialogue_to,
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62 "drop_item": self._drop_item,
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63 "end_game": self._end_game,
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64 }
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65 return my_locals
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66
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67 def choices(self):
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68 my_locals = self._make_locals()
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69 state = self.states[self.state]
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70 return state.choices(my_locals)
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71
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72 def event(self, ev):
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73 my_locals = self._make_locals()
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74 my_locals.update(ev.items)
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75 state = self.states[self.state]
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76 next_state = state.event(my_locals)
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77 if next_state is not None and next_state.name in self.states:
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78 self.states[self.state].leave(my_locals)
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79 self.state = next_state.name
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80 self._me.state = self.state
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81 self.states[self.state].enter(my_locals)
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82
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83 def choice(self, i):
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84 self.event(DsmEvent(choice=i))
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85
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86 def auto_next(self):
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87 self.event(DsmEvent(auto_next=True))
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88
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89 def poke(self):
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90 # poke the current state to see if it feels like making
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91 # a transition.
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92 self.event(DsmEvent(poke=True))
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93
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94
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95 class AttrDict(dict):
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96
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97 def __getattr__(self, name):
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98 if name not in self:
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99 raise AttributeError("No attribute %r" % (name,))
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100 return self[name]
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101
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102
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103 class DsmEvent(object):
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104
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105 def __init__(self, choice=None, auto_next=False, poke=False):
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106 self.items = {
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107 "choice": choice,
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108 "auto_next": auto_next,
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109 "poke": poke,
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110 }
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111
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112
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113 class DsmState(object):
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114 """State within a DSM.
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115 """
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116
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117 def __init__(self, name, state_src, base_path):
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118 self.name = name
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119 self.text = state_src.get("text", None)
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120 self._choices = []
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121 self.triggers = []
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122
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123 choices = state_src.get("choices", [])
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124 for i, choice in enumerate(choices):
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125 pseudo_path = base_path + ["choice-%d" % i]
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126 if "if" in choice:
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127 choice_if = compile(choice["if"],
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128 "<%s>" % ":".join(pseudo_path + ["if"]),
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129 "eval")
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130 else:
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131 choice_if = None
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132 self._choices.append((i, choice["text"], choice_if))
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133 next_state_code = choice.get("next", None)
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134 if next_state_code is not None:
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135 self.triggers.append(
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136 Trigger("choice == %d" % i, next_state_code, pseudo_path))
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137
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138 events = state_src.get("events", [])
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139 for i, event in enumerate(events):
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140 pseudo_path = base_path + ["event-%d" % i]
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141 self.triggers.append(Trigger(event["matches"], event["next"],
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142 pseudo_path))
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143
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144 auto_next = state_src.get("auto_next", None)
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145 self.auto_next_text = state_src.get("auto_next_text", None)
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146 self.auto_next = False
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147 if auto_next is not None:
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148 self.auto_next = True
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149 assert not self._choices, "%s: auto_next and choices are not compatible" % ":".join(base_path)
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150 pseudo_path = base_path + ["auto_next"]
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151 self.triggers.append(Trigger("""auto_next""", auto_next, pseudo_path))
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152
216
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153 on_entry = state_src.get("on_entry", None)
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154 if on_entry is not None:
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155 self.on_entry = compile(on_entry,
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156 "<%s>" % ":".join(base_path + ["on_entry"]),
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157 "exec")
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158 else:
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159 self.on_entry = None
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160
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161 on_exit = state_src.get("on_exit", None)
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162 if on_exit is not None:
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163 self.on_exit = compile(on_exit,
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164 "<%s>" % ":".join(base_path + ["on_exit"]),
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165 "exec")
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166 else:
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167 self.on_exit = None
216
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168
153
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169 def __repr__(self):
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170 return "<%r name=%r>" % (self.__class__.__name__, self.name)
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171
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172 def choices(self, my_locals):
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173 for i, text, choice_if in self._choices:
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174 if choice_if is None:
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175 yield i, text
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176 elif eval(choice_if, {}, my_locals.copy()):
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177 yield i, text
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178
153
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179 def event(self, my_locals):
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180 for trigger in self.triggers:
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181 next_state = trigger.fire(my_locals)
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182 if next_state is not None:
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183 return next_state
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184
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185 def enter(self, my_locals):
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186 if self.on_entry is not None:
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187 exec(self.on_entry, {}, my_locals.copy())
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188
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189 def leave(self, my_locals):
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190 if self.on_exit is not None:
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191 exec(self.on_exit, {}, my_locals.copy())
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192
153
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193
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194 class Trigger(object):
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195 """Matches DSM events and triggers state transitions.
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196 """
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197
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198 def __init__(self, matches_code, next_state_code, pseudo_path):
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199 self._matches = compile(matches_code,
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200 "<%s>" % ":".join(pseudo_path + ["match"]),
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201 "eval")
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202 self._next_state = compile(next_state_code,
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203 "<%s>" % ":".join(pseudo_path + ["next"]),
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204 "eval")
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205
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206 def fire(self, my_locals):
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207 if eval(self._matches, {}, my_locals.copy()):
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208 return eval(self._next_state, {}, my_locals.copy())
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209 return None