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# Copyright (c) 2013-2015 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 readline
import sys
from yaql import __version__ as version
from yaql.language.exceptions import YaqlParsingException
from yaql.language import utils
PROMPT = "yaql> "
def main(context, show_tokens, parser):
print("Yet Another Query Language - command-line query tool")
print("Version {0}".format(version))
if context.get_data('legacy', False):
print("Running in a legacy (0.2.x compatible) mode")
print("Copyright (c) 2013-2017 Mirantis, Inc")
print("")
if not context['']:
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 = input(PROMPT)
except EOFError:
return
if not comm:
continue
if comm[0] == '@':
func_name, args = parse_service_command(comm)
if func_name not in SERVICE_FUNCTIONS:
print('Unknown command ' + func_name)
else:
SERVICE_FUNCTIONS[func_name](args, context)
continue
try:
if show_tokens:
parser.lexer.input(comm)
tokens = []
while True:
tok = parser.lexer.token()
if not tok:
break
tokens.append(tok)
print('Tokens: ' + str(tokens))
expr = parser(comm)
if show_tokens:
print('Expression: ' + str(expr))
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)
print_output(res, context)
except Exception as ex:
print(u'Execution exception: {0}'.format(ex), file=sys.stderr)
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:
data = json.loads(json_str)
except Exception as e:
print('Unable to parse data: ' + e.message)
return
context['$'] = utils.convert_input_data(data)
print('Data from file {0} loaded into context'.format(data_file))
def register_in_context(context, parser):
context.register_function(
lambda context, show_tokens: main(context, show_tokens, parser),
name='__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
def evaluate(expr, parser, data, context):
try:
res = parser(expr).evaluate(data, context)
print_output(res, context)
except Exception as ex:
print(u'Execution exception: {0}'.format(ex), file=sys.stderr)
exit(1)
def print_output(v, context):
if context['#nativeOutput']:
print(v)
else:
print(json.dumps(v, indent=4, ensure_ascii=False))
SERVICE_FUNCTIONS = {
# '@help':print_help,
'@load': load_data,
# '@import':import_module,
# '@register':register_function
}
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