flow.py
8.15 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
from inspect import Signature, Parameter
from . import CAni, autorepr
from .highlight import pygmentize
class _CODE (CAni) :
_fields = []
_options = []
@autorepr
def __init__ (self, *l, **k) :
params = []
for i, name in enumerate(self._fields) :
if name[0] == "*" :
self._fields = self._fields[:]
self._fields[i] = name[1:]
params.append(Parameter(name[1:], Parameter.VAR_POSITIONAL))
else :
params.append(Parameter(name, Parameter.POSITIONAL_OR_KEYWORD))
for name in self._options :
params.append(Parameter(name, Parameter.POSITIONAL_OR_KEYWORD, default=None))
params.append(Parameter("src", Parameter.KEYWORD_ONLY, default=None))
sig = Signature(params)
args = self._args = sig.bind(*l, **k)
args.apply_defaults()
for key, val in args.arguments.items() :
setattr(self, key, val)
self._at = set()
def __str__ (self) :
content = []
for key, val in self.items() :
if isinstance(val, _CODE) :
content.append((key, str(val)))
else :
content.append((key, repr(val)))
return "%s(%s)" % (self.__class__.__name__,
", ".join("%s=%r" % item for item in content))
def items (self) :
for field in self._fields :
yield field, getattr(self, field)
for field in self._options :
member = getattr(self, field, None)
if member is not None :
yield field, member
def source (self) :
sub = {}
for key, val in self.items() :
if isinstance(val, _CODE) :
sub[key] = val.source()
elif isinstance(val, (list, tuple)) :
sub[key] = "".join(v.source() if isinstance(v, _CODE) else str(v)
for v in val)
else :
sub[key] = val
return self.src.format(**sub)
def tex (self) :
sub = self.src.format(**{key : "$" for key, val in self.items()}).split("$")
parts = [pygmentize(sub[0])]
for (key, val), txt in zip(self.items(), sub[1:]) :
if isinstance(val, _CODE) :
parts.append(val.tex())
else :
parts.append(pygmentize(str(val)))
parts.append(pygmentize(txt))
tex = "".join(parts)
if self._at :
return r"\onlyhl{%s}{" % ",".join(str(i) for i in self._at) + tex + "}"
else :
return tex
class RAW (_CODE) :
_fields = []
@autorepr
def __init__ (self, src) :
super().__init__(src=src)
def __call__ (self) :
pass
class WS (RAW) :
_fields = []
def tex (self) :
return self.src
class BLOCK (_CODE) :
_fields = ["*body"]
def __init__ (self, *l, **k) :
super().__init__(*l, **k)
self.body = list(self.body)
def __repr__ (self) :
return "{}({}{}{})".format(self.__class__.__name__,
", ".join(repr(b) for b in self.body),
", " if self.body and self.src else "",
"src={}".format(self.src) if self.src else "")
def __call__ (self) :
self._at.add(self.IP)
for code in self.body :
code()
def source (self) :
return "".join(b.source() for b in self.body)
def tex (self) :
return "".join(b.tex() for b in self.body)
def append (self, code) :
if not self.body :
self.body.append(code)
elif isinstance(self.body[-1], RAW) and isinstance(code, RAW) :
self.body[-1] = RAW(self.body[-1].src + code.src)
elif isinstance(code, RAW) and not code.src :
pass
else :
self.body.append(code)
class STMT (_CODE) :
_fields = ["*steps"]
def __call__ (self) :
for s in self.steps :
self._at.add(self.IP)
self.exec(s)
self.IP += 1
class EXPR (_CODE) :
_fields = ["expr"]
@autorepr
def __init__ (self, *l, **k) :
super().__init__(*l, **k)
if self.src is None :
self.src = self.expr
def __call__ (self) :
self._at.add(self.IP)
self.eval(self.expr)
self.IP += 1
class PY (_CODE) :
_fields = ["py"]
def __call__ (self) :
self.exec(self.py)
def tex (self) :
return ""
def source (self) :
return ""
class ENV (_CODE) :
_fields = ["name", "value"]
def __call__ (self) :
self._env[self.name] = self.value
def tex (self) :
return ""
def source (self) :
return ""
class XDECL (_CODE) :
_fields = ["*names"]
def __call__ (self) :
for name in self.names :
self._env[name] = None
self._at.add(self.IP)
self.IP += 1
class DECL (_CODE) :
_fields = ["name"]
_options = ["init", "animate"]
def __call__ (self) :
if self.init is not None :
self.init()
self._env[self.name] = self.RET
else :
self._env[self.name] = None
self._at.add(self.IP)
self.IP += 1
def tex (self) :
src = super().tex()
if self.animate is None :
return src
else :
return src + " " + "".join(self._tex())
def _tex (self) :
tail = r"\PY{{c+c1}}{{/* {value} */}}"
for value, start, stop in self._env.get(self.name)._h :
if value is not None :
yield (r"\onlyshow{{{start}-{stop}}}{{{value}}}"
r"").format(start=start or 1,
stop=stop or "",
value=tail.format(value=value))
class BreakLoop (Exception) :
pass
class BREAK (_CODE) :
def __init__ (self) :
super().__init__()
self.src = "break"
def __call__ (self) :
self._at.add(self.IP)
self.IP += 1
raise BreakLoop()
class FunctionReturn (Exception) :
def __init__ (self, RET) :
super().__init__()
self.RET = RET
class RETURN (_CODE) :
_options = ["value"]
def __call__ (self) :
if self.value is not None :
self.value()
self._at.add(self.IP)
self.IP += 1
raise FunctionReturn(self.RET)
class IF (_CODE) :
_fields = ["cond", "then"]
_options = ["otherwise"]
def __call__ (self) :
self.cond()
if self.RET :
self.then()
elif self.otherwise is not None :
self.otherwise()
class WHILE (_CODE) :
_fields = ["cond", "body"]
def __call__ (self) :
try :
while True :
self.cond()
if not self.RET :
break
self.body()
except BreakLoop :
return
class DO (_CODE) :
_fields = ["body", "cond"]
def __call__ (self) :
try :
while True :
self.body()
self.cond()
if not self.RET :
break
except BreakLoop :
pass
class FOR (_CODE) :
_fields = ["init", "cond", "step", "body"]
def __call__ (self) :
self.init()
try :
while True :
self.cond()
if not self.RET :
break
self.body()
self.step()
except BreakLoop :
pass
class FUNC (_CODE) :
_fields = ["body"]
def __call__ (self) :
try :
self.body()
except FunctionReturn as exc :
self._env["RET"] = exc.RET
class SWITCH (_CODE) :
_fields = ["cond", "*cases"]
def __call__ (self) :
self.cond()
cond = self.RET
try :
for case in self.cases :
self.CASE = cond
case()
except BreakLoop :
pass
class CASE (_CODE) :
_fields = ["value", "body"]
def __call__ (self) :
self.value()
if self.RET == self.CASE :
self.body()
class DEFAULT (BLOCK) :
def source (self) :
return self.src.format(body=super().source())