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|
#
# 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.
from .. import lexer
from .. import parser
from .. import Fields, This, Child
from . import arithmetic as _arithmetic
from . import filter as _filter
from . import iterable as _iterable
from . import string as _string
class ExtendedJsonPathLexer(lexer.JsonPathLexer):
"""Custom LALR-lexer for JsonPath"""
literals = lexer.JsonPathLexer.literals + ['?', '@', '+', '*', '/', '-']
tokens = (['BOOL'] +
parser.JsonPathLexer.tokens +
['FILTER_OP', 'SORT_DIRECTION', 'FLOAT'])
t_FILTER_OP = r'=~|==?|<=|>=|!=|<|>'
def t_BOOL(self, t):
r'true|false'
t.value = True if t.value == 'true' else False
return t
def t_SORT_DIRECTION(self, t):
r',?\s*(/|\\)'
t.value = t.value[-1]
return t
def t_ID(self, t):
r'@?[a-zA-Z_][a-zA-Z0-9_@\-]*'
# NOTE(sileht): This fixes the ID expression to be
# able to use @ for `This` like any json query
t.type = self.reserved_words.get(t.value, 'ID')
return t
def t_FLOAT(self, t):
r'-?\d+\.\d+'
t.value = float(t.value)
return t
class ExtentedJsonPathParser(parser.JsonPathParser):
"""Custom LALR-parser for JsonPath"""
tokens = ExtendedJsonPathLexer.tokens
def __init__(self, debug=False, lexer_class=None):
lexer_class = lexer_class or ExtendedJsonPathLexer
super(ExtentedJsonPathParser, self).__init__(debug, lexer_class)
def p_jsonpath_operator_jsonpath(self, p):
"""jsonpath : NUMBER operator NUMBER
| FLOAT operator FLOAT
| ID operator ID
| NUMBER operator jsonpath
| FLOAT operator jsonpath
| jsonpath operator NUMBER
| jsonpath operator FLOAT
| jsonpath operator jsonpath
"""
# NOTE(sileht): If we have choice between a field or a string we
# always choice string, because field can be full qualified
# like $.foo == foo and where string can't.
for i in [1, 3]:
if (isinstance(p[i], Fields) and len(p[i].fields) == 1): # noqa
p[i] = p[i].fields[0]
p[0] = _arithmetic.Operation(p[1], p[2], p[3])
def p_operator(self, p):
"""operator : '+'
| '-'
| '*'
| '/'
"""
p[0] = p[1]
def p_jsonpath_named_operator(self, p):
"jsonpath : NAMED_OPERATOR"
if p[1] == 'len':
p[0] = _iterable.Len()
elif p[1] == 'keys':
p[0] = _iterable.Keys()
elif p[1] == 'path':
p[0] = _iterable.Path()
elif p[1] == 'sorted':
p[0] = _iterable.SortedThis()
elif p[1].startswith("split("):
p[0] = _string.Split(p[1])
elif p[1].startswith("sub("):
p[0] = _string.Sub(p[1])
elif p[1].startswith("str("):
p[0] = _string.Str(p[1])
else:
super(ExtentedJsonPathParser, self).p_jsonpath_named_operator(p)
def p_expression(self, p):
"""expression : jsonpath
| jsonpath FILTER_OP ID
| jsonpath FILTER_OP FLOAT
| jsonpath FILTER_OP NUMBER
| jsonpath FILTER_OP BOOL
"""
if len(p) == 2:
left, op, right = p[1], None, None
else:
__, left, op, right = p
p[0] = _filter.Expression(left, op, right)
def p_expressions_expression(self, p):
"expressions : expression"
p[0] = [p[1]]
def p_expressions_and(self, p):
"expressions : expressions '&' expressions"
# TODO(sileht): implements '|'
p[0] = p[1] + p[3]
def p_expressions_parens(self, p):
"expressions : '(' expressions ')'"
p[0] = p[2]
def p_filter(self, p):
"filter : '?' expressions "
p[0] = _filter.Filter(p[2])
def p_jsonpath_filter(self, p):
"jsonpath : jsonpath '[' filter ']'"
p[0] = Child(p[1], p[3])
def p_sort(self, p):
"sort : SORT_DIRECTION jsonpath"
p[0] = (p[2], p[1] != "/")
def p_sorts_sort(self, p):
"sorts : sort"
p[0] = [p[1]]
def p_sorts_comma(self, p):
"sorts : sorts sorts"
p[0] = p[1] + p[2]
def p_jsonpath_sort(self, p):
"jsonpath : jsonpath '[' sorts ']'"
sort = _iterable.SortedThis(p[3])
p[0] = Child(p[1], sort)
def p_jsonpath_this(self, p):
"jsonpath : '@'"
p[0] = This()
precedence = [
('left', '+', '-'),
('left', '*', '/'),
] + parser.JsonPathParser.precedence + [
('nonassoc', 'ID'),
]
def parse(path, debug=False):
return ExtentedJsonPathParser(debug=debug).parse(path)
|
