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# 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 types
import ply.yacc as yacc
import expressions
import exceptions
import lexer
import tempfile
tokens = lexer.tokens
def p_value_to_const(p):
"""
value : STRING
| QUOTED_STRING
| NUMBER
| TRUE
| FALSE
| NULL
"""
p[0] = expressions.Constant(p[1])
def p_value_to_dollar(p):
"""
value : DOLLAR
"""
p[0] = expressions.GetContextValue(expressions.Constant(p[1]))
def p_value_to_symbol(p):
"""
symbol : SYMBOL
"""
symbol_parts = p[1].split(':')
sns = symbol_parts[0]
name = symbol_parts[1]
expanding = expressions.UnaryOperator(':', expressions.Constant(sns))
p[0] = expressions.Function('#validate', None, expanding,
expressions.Constant(name))
def p_attribution(p):
"""
value : value '.' STRING
| value '.' QUOTED_STRING
"""
p[0] = expressions.Att(p[1], expressions.Constant(p[3]))
def p_attribution_to_symbol(p):
"""
value : value '.' symbol
"""
p[0] = expressions.Att(p[1], p[3])
def p_val_to_function(p):
"""
value : func
| symbol
"""
p[0] = p[1]
def p_method_no_args(p):
"""
func : value '.' FUNC ')'
"""
p[0] = expressions.Function(p[3], p[1])
def p_arg_definition(p):
"""
arg : value
"""
p[0] = p[1]
def p_method_w_args(p):
"""
func : value '.' FUNC arg ')'
"""
if isinstance(p[4], types.ListType):
arg = p[4]
else:
arg = [p[4]]
p[0] = expressions.Function(p[3], p[1], *arg)
def p_function_no_args(p):
"""
func : FUNC ')'
"""
p[0] = expressions.Function(p[1], None)
def p_function_w_args(p):
"""
func : FUNC arg ')'
"""
if isinstance(p[2], types.ListType):
arg = p[2]
else:
arg = [p[2]]
p[0] = expressions.Function(p[1], None, *arg)
def p_arg_list(p):
"""
arg : arg ',' arg
"""
val_list = []
if isinstance(p[1], types.ListType):
val_list += p[1]
else:
val_list.append(p[1])
if isinstance(p[3], types.ListType):
val_list += p[3]
else:
val_list.append(p[3])
p[0] = val_list
def p_val_with_binary_op(p):
"""
value : value '+' value
| value '-' value
| value '*' value
| value '/' value
| value '>' value
| value '<' value
| value '=' value
| value NE value
| value LE value
| value GE value
| value OR value
| value AND value
| value IS value
| value IN value
"""
p[0] = expressions.BinaryOperator(p[2], p[1], p[3])
def p_val_with_unary_op(p):
"""
value : NOT value
"""
p[0] = expressions.UnaryOperator(p[1], p[2])
def p_val_in_parenthesis(p):
"""
value : '(' value ')'
"""
p[0] = expressions.Wrap(p[2])
def p_val_w_filter(p):
"""
value : value FILTER value ']'
"""
p[0] = expressions.Filter(p[1], p[3])
def p_val_tuple(p):
"""
value : value TUPLE value
"""
p[0] = expressions.Tuple.create_tuple(p[1], p[3])
def p_error(p):
if p:
raise exceptions.YaqlGrammarException(p.value, p.lexpos)
else:
raise exceptions.YaqlGrammarException(None, None)
precedence = (
('left', 'TUPLE'),
('left', 'OR'),
('left', 'AND'),
('left', 'NOT'),
('nonassoc', '>', '<', '=', 'NE', 'LE', 'GE', 'IS', 'IN'),
('left', '+', '-'),
('left', '*', '/'),
('left', ','),
('left', 'FILTER', ']'),
('left', '.'),
('left', 'SYMBOL')
)
parser = yacc.yacc(debug=False, outputdir=tempfile.gettempdir(), tabmodule='parser_table')
def parse(expression):
return parser.parse(expression)
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