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
|
class FileString(object):
"""Bare-bones pseudo-file class"""
def __init__(self, str=""):
object.__init__(self)
self.str = str
def __iter__(self):
for line in self.str.splitlines(True):
yield line
def write(self, line):
self.str += line
def parse(f):
"""Parses a mapfile, returns a Dictionary
>>> f = FileString("1:q\\n2:q\\n3:q\\n>p\\n4:q\\n5:q\\n6:q\\n")
>>> parse(f)["q"]
'p'
>>> parse("1:q\\n2:q\\n3:q\\n>r\\n4:q\\n5:q\\n6:q\\n")["q"]
'r'
>>> parse("1:q:5\\n>s\\n2:q:5\\n")["q:5"]
's'
>>> parse("1:q\\n>s\\n2:q\\n1:q\\n>s\\n2:q\\n")
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "libbe/mapfile.py", line 41, in parse
assert (lnum == prev_num + 1)
AssertionError
>>> parse("1:q\\n>s\\n2:q\\n1:l\\n>s\\n2:l\\n1:q\\n>s\\n2:q\\n")
Traceback (most recent call last):
AssertionError
>>> parse("1:q\\n>s\\n>s\\n2:q\\n")
Traceback (most recent call last):
AssertionError
"""
if isinstance(f, basestring):
f = FileString(f)
result = {}
name = None
prev_num = None
for line in f:
value = None
# Handle values
if line.startswith(">"):
assert (name is not None)
assert (not result.has_key(name))
result[name] = line[1:].rstrip("\n")
# Handle names
else:
lname = ":".join(line.split(":")[1:]).rstrip("\n")
lnum = int(line.split(":")[0])
#special-case the first execution
if name is None:
name = lname
#ensure sequential operation
elif lname == name:
assert (lnum == prev_num + 1)
#if name changes, start over at 1
else:
if lnum != 1:
assert(lname != name)
raise "%i %s %s" % (lnum, lname, name)
assert (lnum == 1)
name = lname
prev_num = lnum
return result
def generate(f, map, context=3):
"""
>>> f = FileString()
>>> generate(f, {"q":"p"})
>>> f.str
'1:q\\n2:q\\n3:q\\n>p\\n4:q\\n5:q\\n6:q\\n'
>>> parse(f)["q"]
'p'
>>> f = FileString()
>>> generate(f, {"a":"b", "c":"d", "e":"f"})
>>> dict = parse(f)
>>> dict["a"]
'b'
>>> dict["c"]
'd'
>>> dict["e"]
'f'
"""
assert(context > 0)
keys = map.keys()
keys.sort()
for key in keys:
for i in range(context):
f.write("%i:%s\n" % (i+1, key))
f.write(">%s\n" % map[key])
for i in range(context):
f.write("%i:%s\n" % (i+context+1, key))
class IllegalKey(Exception):
def __init__(self, key):
Exception.__init__(self, 'Illegal key "%s"' % key)
self.key = key
class IllegalValue(Exception):
def __init__(self, value):
Exception.__init__(self, 'Illegal value "%s"' % value)
self.value = value
def generate2(f, map, context=3):
"""Generate a format-2 mapfile. This is a simpler format, but should merge
better, because there's no chance of confusion for appends, and lines
are unique for both key and value.
>>> f = FileString()
>>> generate2(f, {"q":"p"})
>>> f.str
'\\n\\n\\nq=p\\n\\n\\n\\n'
>>> generate2(f, {"q=":"p"})
Traceback (most recent call last):
IllegalKey: Illegal key "q="
>>> generate2(f, {"q\\n":"p"})
Traceback (most recent call last):
IllegalKey: Illegal key "q\\n"
>>> generate2(f, {"":"p"})
Traceback (most recent call last):
IllegalKey: Illegal key ""
>>> generate2(f, {">q":"p"})
Traceback (most recent call last):
IllegalKey: Illegal key ""
>>> generate2(f, {"q":"p\\n"})
Traceback (most recent call last):
IllegalValue: Illegal value "p\\n"
"""
assert(context > 0)
keys = map.keys()
keys.sort()
for key in keys:
try:
assert not key.startswith('>')
assert('\n' not in key)
assert('=' not in key)
assert(len(key) > 0)
except AssertionError:
raise IllegalKey(key.encode('string_escape'))
if "\n" in map[key]:
raise IllegalValue(map[key].encode('string_escape'))
for key in keys:
for i in range(context):
f.write("\n")
f.write("%s=%s\n" % (key, map[key]))
for i in range(context):
f.write("\n")
def parse2(f):
"""
Parse a format-2 mapfile.
>>> parse2('\\n\\n\\nq=p\\n\\n\\n\\n')['q']
'p'
>>> parse2('\\n\\nq=\\'p\\'\\n\\n\\n\\n')['q']
"\'p\'"
>>> f = FileString()
>>> generate2(f, {"a":"b", "c":"d", "e":"f"})
>>> dict = parse2(f)
>>> dict["a"]
'b'
>>> dict["c"]
'd'
>>> dict["e"]
'f'
"""
if isinstance(f, basestring):
f = FileString(f)
result = {}
for line in f:
line = line.rstrip('\n')
if len(line) == 0:
continue
name,value = line.split('=', 1)
assert not result.has_key('name')
result[name] = value
return result
|
