aboutsummaryrefslogtreecommitdiffstats
path: root/libbe/storage/util/mapfile.py
blob: b33ce84fc283a9109bdc08867172a5fcc3fdd628 (plain) (blame)
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
# Copyright (C) 2005-2012 Aaron Bentley <abentley@panoramicfeedback.com>
#                         Chris Ball <cjb@laptop.org>
#                         Gianluca Montecchi <gian@grys.it>
#                         W. Trevor King <wking@drexel.edu>
#
# This file is part of Bugs Everywhere.
#
# Bugs Everywhere is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 2 of the License, or (at your option) any
# later version.
#
# Bugs Everywhere is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# Bugs Everywhere.  If not, see <http://www.gnu.org/licenses/>.

"""Serializing and deserializing dictionaries of parameters.

The serialized "mapfiles" should be clear, flat-text strings, and allow
easy merging of independent/conflicting changes.
"""

import errno
import os.path
import types
import yaml

import libbe
if libbe.TESTING == True:
    import doctest


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

class InvalidMapfileContents(Exception):
    def __init__(self, contents):
        Exception.__init__(self, 'Invalid YAML contents')
        self.contents = contents

def generate(map):
    """Generate a YAML mapfile content string.

    Examples
    --------

    >>> generate({'q':'p'})
    'q: p\\n\\n'
    >>> generate({'q':u'Fran\u00e7ais'})
    'q: Fran\\xc3\\xa7ais\\n\\n'
    >>> generate({'q':u'hello'})
    'q: hello\\n\\n'
    >>> generate({'q=':'p'})
    Traceback (most recent call last):
    IllegalKey: Illegal key "q="
    >>> generate({'q:':'p'})
    Traceback (most recent call last):
    IllegalKey: Illegal key "q:"
    >>> generate({'q\\n':'p'})
    Traceback (most recent call last):
    IllegalKey: Illegal key "q\\n"
    >>> generate({'':'p'})
    Traceback (most recent call last):
    IllegalKey: Illegal key ""
    >>> generate({'>q':'p'})
    Traceback (most recent call last):
    IllegalKey: Illegal key ">q"
    >>> generate({'q':'p\\n'})
    Traceback (most recent call last):
    IllegalValue: Illegal value "p\\n"

    See Also
    --------
    parse : inverse
    """
    keys = map.keys()
    keys.sort()
    for key in keys:
        try:
            assert not key.startswith('>')
            assert('\n' not in key)
            assert('=' not in key)
            assert(':' not in key)
            assert(len(key) > 0)
        except AssertionError:
            raise IllegalKey(unicode(key).encode('unicode_escape'))
        if '\n' in map[key]:
            raise IllegalValue(unicode(map[key]).encode('unicode_escape'))

    lines = []
    for key in keys:
        lines.append(yaml.safe_dump({key: map[key]},
                                    default_flow_style=False,
                                    allow_unicode=True))
        lines.append('')
    return '\n'.join(lines)

def parse(contents):
    """Parse a YAML mapfile string.

    Examples
    --------

    >>> parse('q: p\\n\\n')['q']
    'p'
    >>> parse('q: \\'p\\'\\n\\n')['q']
    'p'
    >>> contents = generate({'a':'b', 'c':'d', 'e':'f'})
    >>> dict = parse(contents)
    >>> dict['a']
    'b'
    >>> dict['c']
    'd'
    >>> dict['e']
    'f'
    >>> contents = generate({'q':u'Fran\u00e7ais'})
    >>> dict = parse(contents)
    >>> dict['q']
    u'Fran\\xe7ais'
    >>> dict = parse('a!')
    Traceback (most recent call last):
      ...
    InvalidMapfileContents: Invalid YAML contents

    See Also
    --------
    generate : inverse

    """
    c = yaml.load(contents)
    if type(c) == types.StringType:
        raise InvalidMapfileContents(
            'Unable to parse YAML (BE format missmatch?):\n\n%s' % contents)
    return c or {}

if libbe.TESTING == True:
    suite = doctest.DocTestSuite()