forked from RustPython/RustPython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcode.py
More file actions
317 lines (250 loc) · 10.4 KB
/
code.py
File metadata and controls
317 lines (250 loc) · 10.4 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
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
"""Utilities needed to emulate Python's interactive interpreter.
"""
# Inspired by similar code by Jeff Epler and Fredrik Lundh.
import sys
import traceback
from codeop import CommandCompiler, compile_command
__all__ = ["InteractiveInterpreter", "InteractiveConsole", "interact",
"compile_command"]
class InteractiveInterpreter:
"""Base class for InteractiveConsole.
This class deals with parsing and interpreter state (the user's
namespace); it doesn't deal with input buffering or prompting or
input file naming (the filename is always passed in explicitly).
"""
def __init__(self, locals=None):
"""Constructor.
The optional 'locals' argument specifies the dictionary in
which code will be executed; it defaults to a newly created
dictionary with key "__name__" set to "__console__" and key
"__doc__" set to None.
"""
if locals is None:
locals = {"__name__": "__console__", "__doc__": None}
self.locals = locals
self.compile = CommandCompiler()
def runsource(self, source, filename="<input>", symbol="single"):
"""Compile and run some source in the interpreter.
Arguments are as for compile_command().
One of several things can happen:
1) The input is incorrect; compile_command() raised an
exception (SyntaxError or OverflowError). A syntax traceback
will be printed by calling the showsyntaxerror() method.
2) The input is incomplete, and more input is required;
compile_command() returned None. Nothing happens.
3) The input is complete; compile_command() returned a code
object. The code is executed by calling self.runcode() (which
also handles run-time exceptions, except for SystemExit).
The return value is True in case 2, False in the other cases (unless
an exception is raised). The return value can be used to
decide whether to use sys.ps1 or sys.ps2 to prompt the next
line.
"""
try:
code = self.compile(source, filename, symbol)
except (OverflowError, SyntaxError, ValueError):
# Case 1
self.showsyntaxerror(filename)
return False
if code is None:
# Case 2
return True
# Case 3
self.runcode(code)
return False
def runcode(self, code):
"""Execute a code object.
When an exception occurs, self.showtraceback() is called to
display a traceback. All exceptions are caught except
SystemExit, which is reraised.
A note about KeyboardInterrupt: this exception may occur
elsewhere in this code, and may not always be caught. The
caller should be prepared to deal with it.
"""
try:
exec(code, self.locals)
except SystemExit:
raise
except:
self.showtraceback()
def showsyntaxerror(self, filename=None):
"""Display the syntax error that just occurred.
This doesn't display a stack trace because there isn't one.
If a filename is given, it is stuffed in the exception instead
of what was there before (because Python's parser always uses
"<string>" when reading from a string).
The output is written by self.write(), below.
"""
type, value, tb = sys.exc_info()
sys.last_exc = value
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
if filename and type is SyntaxError:
# Work hard to stuff the correct filename in the exception
try:
msg, (dummy_filename, lineno, offset, line) = value.args
except ValueError:
# Not the format we expect; leave it alone
pass
else:
# Stuff in the right filename
value = SyntaxError(msg, (filename, lineno, offset, line))
sys.last_exc = sys.last_value = value
if sys.excepthook is sys.__excepthook__:
lines = traceback.format_exception_only(type, value)
self.write(''.join(lines))
else:
# If someone has set sys.excepthook, we let that take precedence
# over self.write
sys.excepthook(type, value, tb)
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
sys.last_type, sys.last_value, last_tb = ei = sys.exc_info()
sys.last_traceback = last_tb
sys.last_exc = ei[1]
try:
lines = traceback.format_exception(ei[0], ei[1], last_tb.tb_next)
if sys.excepthook is sys.__excepthook__:
self.write(''.join(lines))
else:
# If someone has set sys.excepthook, we let that take precedence
# over self.write
sys.excepthook(ei[0], ei[1], last_tb)
finally:
last_tb = ei = None
def write(self, data):
"""Write a string.
The base implementation writes to sys.stderr; a subclass may
replace this with a different implementation.
"""
sys.stderr.write(data)
class InteractiveConsole(InteractiveInterpreter):
"""Closely emulate the behavior of the interactive Python interpreter.
This class builds on InteractiveInterpreter and adds prompting
using the familiar sys.ps1 and sys.ps2, and input buffering.
"""
def __init__(self, locals=None, filename="<console>"):
"""Constructor.
The optional locals argument will be passed to the
InteractiveInterpreter base class.
The optional filename argument should specify the (file)name
of the input stream; it will show up in tracebacks.
"""
InteractiveInterpreter.__init__(self, locals)
self.filename = filename
self.resetbuffer()
def resetbuffer(self):
"""Reset the input buffer."""
self.buffer = []
def interact(self, banner=None, exitmsg=None):
"""Closely emulate the interactive Python console.
The optional banner argument specifies the banner to print
before the first interaction; by default it prints a banner
similar to the one printed by the real Python interpreter,
followed by the current class name in parentheses (so as not
to confuse this with the real interpreter -- since it's so
close!).
The optional exitmsg argument specifies the exit message
printed when exiting. Pass the empty string to suppress
printing an exit message. If exitmsg is not given or None,
a default message is printed.
"""
try:
sys.ps1
except AttributeError:
sys.ps1 = ">>> "
try:
sys.ps2
except AttributeError:
sys.ps2 = "... "
cprt = 'Type "help", "copyright", "credits" or "license" for more information.'
if banner is None:
self.write("Python %s on %s\n%s\n(%s)\n" %
(sys.version, sys.platform, cprt,
self.__class__.__name__))
elif banner:
self.write("%s\n" % str(banner))
more = 0
while 1:
try:
if more:
prompt = sys.ps2
else:
prompt = sys.ps1
try:
line = self.raw_input(prompt)
except EOFError:
self.write("\n")
break
else:
more = self.push(line)
except KeyboardInterrupt:
self.write("\nKeyboardInterrupt\n")
self.resetbuffer()
more = 0
if exitmsg is None:
self.write('now exiting %s...\n' % self.__class__.__name__)
elif exitmsg != '':
self.write('%s\n' % exitmsg)
def push(self, line):
"""Push a line to the interpreter.
The line should not have a trailing newline; it may have
internal newlines. The line is appended to a buffer and the
interpreter's runsource() method is called with the
concatenated contents of the buffer as source. If this
indicates that the command was executed or invalid, the buffer
is reset; otherwise, the command is incomplete, and the buffer
is left as it was after the line was appended. The return
value is 1 if more input is required, 0 if the line was dealt
with in some way (this is the same as runsource()).
"""
self.buffer.append(line)
source = "\n".join(self.buffer)
more = self.runsource(source, self.filename)
if not more:
self.resetbuffer()
return more
def raw_input(self, prompt=""):
"""Write a prompt and read a line.
The returned line does not include the trailing newline.
When the user enters the EOF key sequence, EOFError is raised.
The base implementation uses the built-in function
input(); a subclass may replace this with a different
implementation.
"""
return input(prompt)
def interact(banner=None, readfunc=None, local=None, exitmsg=None):
"""Closely emulate the interactive Python interpreter.
This is a backwards compatible interface to the InteractiveConsole
class. When readfunc is not specified, it attempts to import the
readline module to enable GNU readline if it is available.
Arguments (all optional, all default to None):
banner -- passed to InteractiveConsole.interact()
readfunc -- if not None, replaces InteractiveConsole.raw_input()
local -- passed to InteractiveInterpreter.__init__()
exitmsg -- passed to InteractiveConsole.interact()
"""
console = InteractiveConsole(local)
if readfunc is not None:
console.raw_input = readfunc
else:
try:
import readline
except ImportError:
pass
console.interact(banner, exitmsg)
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-q', action='store_true',
help="don't print version and copyright messages")
args = parser.parse_args()
if args.q or sys.flags.quiet:
banner = ''
else:
banner = None
interact(banner)