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
|
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Parser.py: a main for invoking code in coverage/parser.py"""
import collections
import dis
import glob
import optparse
import os
import re
import sys
import textwrap
import types
from coverage.parser import PythonParser
from coverage.python import get_python_source
class ParserMain:
"""A main for code parsing experiments."""
def main(self, args):
"""A main function for trying the code from the command line."""
parser = optparse.OptionParser()
parser.add_option(
"-d", action="store_true", dest="dis",
help="Disassemble"
)
parser.add_option(
"-R", action="store_true", dest="recursive",
help="Recurse to find source files"
)
parser.add_option(
"-s", action="store_true", dest="source",
help="Show analyzed source"
)
parser.add_option(
"-t", action="store_true", dest="tokens",
help="Show tokens"
)
options, args = parser.parse_args()
if options.recursive:
if args:
root = args[0]
else:
root = "."
for root, _, _ in os.walk(root):
for f in glob.glob(root + "/*.py"):
self.one_file(options, f)
elif not args:
parser.print_help()
else:
self.one_file(options, args[0])
def one_file(self, options, filename):
"""Process just one file."""
# `filename` can have a line number suffix. In that case, extract those
# lines, dedent them, and use that. This is for trying test cases
# embedded in the test files.
match = re.search(r"^(.*):(\d+)-(\d+)$", filename)
if match:
filename, start, end = match.groups()
start, end = int(start), int(end)
else:
start = end = None
try:
text = get_python_source(filename)
if start is not None:
lines = text.splitlines(True)
text = textwrap.dedent("".join(lines[start-1:end]).replace("\\\\", "\\"))
pyparser = PythonParser(text, filename=filename, exclude=r"no\s*cover")
pyparser.parse_source()
except Exception as err:
print(f"{err}")
return
if options.dis:
print("Main code:")
disassemble(pyparser)
arcs = pyparser.arcs()
if options.source or options.tokens:
pyparser.show_tokens = options.tokens
pyparser.parse_source()
if options.source:
arc_chars = self.arc_ascii_art(arcs)
if arc_chars:
arc_width = max(len(a) for a in arc_chars.values())
exit_counts = pyparser.exit_counts()
for lineno, ltext in enumerate(pyparser.lines, start=1):
marks = [' ', ' ', ' ', ' ', ' ']
a = ' '
if lineno in pyparser.raw_statements:
marks[0] = '-'
if lineno in pyparser.statements:
marks[1] = '='
exits = exit_counts.get(lineno, 0)
if exits > 1:
marks[2] = str(exits)
if lineno in pyparser.raw_docstrings:
marks[3] = '"'
if lineno in pyparser.raw_classdefs:
marks[3] = 'C'
if lineno in pyparser.raw_excluded:
marks[4] = 'x'
if arc_chars:
a = arc_chars[lineno].ljust(arc_width)
else:
a = ""
print("%4d %s%s %s" % (lineno, "".join(marks), a, ltext))
def arc_ascii_art(self, arcs):
"""Draw arcs as ascii art.
Returns a dictionary mapping line numbers to ascii strings to draw for
that line.
"""
plus_ones = set()
arc_chars = collections.defaultdict(str)
for lfrom, lto in sorted(arcs):
if lfrom < 0:
arc_chars[lto] += 'v'
elif lto < 0:
arc_chars[lfrom] += '^'
else:
if lfrom == lto - 1:
plus_ones.add(lfrom)
arc_chars[lfrom] += "" # ensure this line is in arc_chars
continue
if lfrom < lto:
l1, l2 = lfrom, lto
else:
l1, l2 = lto, lfrom
w = first_all_blanks(arc_chars[l] for l in range(l1, l2+1))
for l in range(l1, l2+1):
if l == lfrom:
ch = '<'
elif l == lto:
ch = '>'
else:
ch = '|'
arc_chars[l] = set_char(arc_chars[l], w, ch)
# Add the plusses as the first character
for lineno, arcs in arc_chars.items():
arc_chars[lineno] = (
("+" if lineno in plus_ones else " ") +
arcs
)
return arc_chars
def all_code_objects(code):
"""Iterate over all the code objects in `code`."""
stack = [code]
while stack:
# We're going to return the code object on the stack, but first
# push its children for later returning.
code = stack.pop()
stack.extend(c for c in code.co_consts if isinstance(c, types.CodeType))
yield code
def disassemble(pyparser):
"""Disassemble code, for ad-hoc experimenting."""
code = compile(pyparser.text, "", "exec")
for code_obj in all_code_objects(code):
if pyparser.text:
srclines = pyparser.text.splitlines()
else:
srclines = None
print("\n%s: " % code_obj)
upto = None
for inst in dis.get_instructions(code_obj):
if inst.starts_line is not None:
if srclines:
upto = upto or inst.starts_line - 1
while upto <= inst.starts_line - 1:
print("{:>100}{}".format("", srclines[upto]))
upto += 1
elif inst.offset > 0:
print("")
line = inst._disassemble()
print(f"{line:<70}")
print("")
def set_char(s, n, c):
"""Set the nth char of s to be c, extending s if needed."""
s = s.ljust(n)
return s[:n] + c + s[n+1:]
def blanks(s):
"""Return the set of positions where s is blank."""
return {i for i, c in enumerate(s) if c == " "}
def first_all_blanks(ss):
"""Find the first position that is all blank in the strings ss."""
ss = list(ss)
blankss = blanks(ss[0])
for s in ss[1:]:
blankss &= blanks(s)
if blankss:
return min(blankss)
else:
return max(len(s) for s in ss)
if __name__ == '__main__':
ParserMain().main(sys.argv[1:])
|
