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
|
# Copyright (c) 2013 Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import json
import os
import types
import yaql
import readline
from json import JSONDecoder
from yaql import __version__ as version
from yaql.context import ContextAware, Context
from yaql.exceptions import YaqlParsingException
from yaql.utils import limit
PROMPT = "yaql> "
@ContextAware()
def main(context):
print("Yet Another Query Language - command-line query tool")
print("Version {0}".format(version))
print("Copyright (c) 2013 Mirantis, Inc")
print("")
if not context.get_data():
print("No data loaded into context ")
print("Type '@load data-file.json' to load data")
print("")
readline.parse_and_bind('')
comm = True
while comm != 'exit':
try:
comm = raw_input(PROMPT)
except EOFError:
return
if not comm:
continue
if comm[0] == '@':
funcName, args = parse_service_command(comm)
if funcName not in SERVICE_FUNCTIONS:
print("Unknown command " + funcName)
else:
SERVICE_FUNCTIONS[funcName](args, context)
continue
try:
expr = yaql.parse(comm)
except YaqlParsingException as ex:
if ex.position:
pointer_string = (" " * (ex.position + len(PROMPT))) + '^'
print(pointer_string)
print(ex.message)
continue
try:
res = expr.evaluate(context=Context(context))
if isinstance(res, types.GeneratorType):
res = limit(res)
print(json.dumps(res, indent=4))
except Exception as ex:
print("Execution exception:")
if hasattr(ex, 'message'):
print(ex.message)
else:
print("Unknown")
def load_data(data_file, context):
try:
json_str = open(os.path.expanduser(data_file)).read()
except IOError as e:
print("Unable to read data file '{0}': {1}".format(data_file,
e.strerror))
return
try:
decoder = JSONDecoder()
data = decoder.decode(json_str)
except Exception as e:
print("Unable to parse data: " + e.message)
return
context.set_data(data)
print("Data from file '{0}' loaded into context".format(data_file))
def register_in_context(context):
context.register_function(main, '__main')
def parse_service_command(comm):
space_index = comm.find(' ')
if space_index == -1:
return comm, None
func_name = comm[:space_index]
args = comm[len(func_name) + 1:]
return func_name, args
SERVICE_FUNCTIONS = {
# '@help':print_help,
'@load': load_data,
# '@import':import_module,
# '@register':register_function
}
|
