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# Copyright (c) 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 types
from yaql.language import exceptions
from yaql.language import expressions
from yaql.language import utils
class Parser(object):
def __init__(self, lexer, yaql_operators, engine):
self.tokens = lexer.tokens
self._aliases = {}
self._generate_operator_funcs(yaql_operators, engine)
def _generate_operator_funcs(self, yaql_operators, engine):
binary_doc = ''
unary_doc = ''
precedence_dict = {}
for up, bp, op_name, op_alias in yaql_operators.operators.values():
self._aliases[op_name] = op_alias
if up:
la = precedence_dict.setdefault(
(abs(up), 'l' if up > 0 else 'r'), [])
la.append('UNARY_' + op_name if bp else op_name)
unary_doc += ('value : ' if not unary_doc else '\n| ')
spec_prefix = '{0} value' if up > 0 else 'value {0}'
if bp:
unary_doc += (spec_prefix + ' %prec UNARY_{0}').format(
op_name)
else:
unary_doc += spec_prefix.format(op_name)
if bp:
la = precedence_dict.setdefault(
(abs(bp), 'l' if bp > 0 else 'r'), [])
if op_name == 'INDEXER':
la.extend(('LIST', 'INDEXER'))
elif op_name == 'MAP':
la.append('MAP')
else:
la.append(op_name)
binary_doc += ((
'value : ' if not binary_doc else '\n| ') +
'value {0} value'.format(op_name))
# noinspection PyProtectedMember
def p_binary(this, p):
alias = this._aliases.get(p.slice[2].type)
p[0] = expressions.BinaryOperator(p[2], p[1], p[3], alias)
# noinspection PyProtectedMember
def p_unary(this, p):
if p[1] in yaql_operators.operators:
alias = this._aliases.get(p.slice[1].type)
p[0] = expressions.UnaryOperator(p[1], p[2], alias)
else:
alias = this._aliases.get(p.slice[2].type)
p[0] = expressions.UnaryOperator(p[2], p[1], alias)
p_binary.__doc__ = binary_doc
self.p_binary = types.MethodType(p_binary, self)
p_unary.__doc__ = unary_doc
self.p_unary = types.MethodType(p_unary, self)
precedence = []
for i in range(1, len(precedence_dict) + 1):
for oa in ('r', 'l'):
value = precedence_dict.get((i, oa))
if value:
precedence.append(
(('left',) if oa == 'l' else ('right',)) +
tuple(value)
)
precedence.insert(0, ('left', ','))
precedence.reverse()
self.precedence = tuple(precedence)
def p_value_call(this, p):
"""
func : value '(' args ')'
"""
arg = ()
if len(p) > 4:
arg = p[3]
p[0] = expressions.Function('#call', p[1], *arg)
if engine.allow_delegates:
self.p_value_call = types.MethodType(p_value_call, self)
@staticmethod
def p_value_to_const(p):
"""
value : QUOTED_STRING
| NUMBER
| TRUE
| FALSE
| NULL
"""
p[0] = expressions.Constant(p[1])
@staticmethod
def p_keyword_constant(p):
"""
value : KEYWORD_STRING
"""
p[0] = expressions.KeywordConstant(p[1])
@staticmethod
def p_value_to_dollar(p):
"""
value : DOLLAR
"""
p[0] = expressions.GetContextValue(expressions.Constant(p[1]))
@staticmethod
def p_val_in_parenthesis(p):
"""
value : '(' value ')'
"""
p[0] = expressions.Wrap(p[2])
@staticmethod
def p_args(p):
"""
args : arglist
| named_arglist
| arglist ',' named_arglist
| incomplete_arglist ',' named_arglist
|
"""
if len(p) == 1:
p[0] = []
elif len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + p[3]
@staticmethod
def p_indexer(p):
"""
value : value INDEXER args ']'
"""
p[0] = expressions.IndexExpression(p[1], *p[3])
@staticmethod
def p_list(p):
"""
value : INDEXER args ']' %prec LIST
"""
p[0] = expressions.ListExpression(*p[2])
@staticmethod
def p_map(p):
"""
value : MAP args '}'
"""
p[0] = expressions.MapExpression(*p[2])
@staticmethod
def p_val_to_function(p):
"""
value : func
"""
p[0] = p[1]
@staticmethod
def p_named_arg_definition(p):
"""
named_arg : value MAPPING value
"""
p[0] = expressions.MappingRuleExpression(p[1], p[3])
@staticmethod
def p_arg_list(p):
"""
arglist : value
| ',' arglist
| arglist ',' arglist
| incomplete_arglist ',' arglist
"""
if len(p) == 2:
p[0] = [p[1]]
elif len(p) == 3:
p[0] = [utils.NO_VALUE] + p[2]
elif len(p) == 4:
p[0] = p[1] + p[3]
@staticmethod
def p_incomplete_arg_list(p):
"""
incomplete_arglist : arglist ','
"""
p[0] = p[1] + [utils.NO_VALUE]
@staticmethod
def p_named_arg_list(p):
"""
named_arglist : named_arg
| named_arglist ',' named_arg
"""
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[3]]
@staticmethod
def p_function(p):
"""
func : FUNC args ')'
"""
arg = ()
if len(p) > 3:
arg = p[2]
p[0] = expressions.Function(p[1], *arg)
@staticmethod
def p_error(p):
if p:
raise exceptions.YaqlGrammarException(
p.lexer.lexdata, p.value, p.lexpos)
else:
raise exceptions.YaqlGrammarException(None, None, None)
|
