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"""
Cypher language parser
- clear logical separation between lexing/parsing still missing
- e_XXX class object should be considered internal
"""
import re
from collections import defaultdict
import logging
from enum import Enum
#
# meta label schema
#
META_LABEL__RZ_DOC = '__RZDOC_'
META_LABEL__RZ_DOC_PREFIX = '__RZ_DOC_ID_'
meta_label_set = [META_LABEL__RZ_DOC, # RZ doc node
'__HEAD',
'__USER', # user node
'__Commit', # diff commit node
'__Parent', # parent commit node
'__Authored-by',
# __RZ_DOC_ID_xxx, # [!] considered a meta label, excluded from set to allow returning nodes with this label
]
log = logging.getLogger('rhizi')
class Query_Struct_Type(Enum):
unkown = 1
r = 2
w = 3
rw = 4
def __add__(self, other):
if self == other or self == pt_root.Query_Struct_Type.rw:
return self
if self == Query_Struct_Type.unkown:
return other
if self == Query_Struct_Type.r and other != Query_Struct_Type.r:
return Query_Struct_Type.rw
if self == Query_Struct_Type.w and other != Query_Struct_Type.w:
return Query_Struct_Type.rw
def __str__(self):
if self == Query_Struct_Type.unkown: return 'unkown'
if self == Query_Struct_Type.r: return 'r'
if self == Query_Struct_Type.w: return 'w'
if self == Query_Struct_Type.rw: return 'rw'
assert False
class Query_Transformation(object):
"""
A query transformation, which may be applied to either a DB_op or a DB_Query
"""
def __call__(self, value):
q_set = []
if isinstance(value, DB_Query):
q_set.append(value)
else: # assume iterable
assert hasattr(value, '__iter__')
for dbq in value:
assert isinstance(dbq, DB_Query)
q_set.append(dbq)
for dbq in q_set:
log.debug('%r' % (dbq))
self.apply_to_single_query(dbq)
log.debug('%r' % (dbq))
return value
def apply_to_single_query(self, dbq):
pass
class QT_Node_Filter__Doc_ID_Label(Query_Transformation):
def __init__(self, doc_id):
self.doc_id = doc_id
def apply_to_single_query(self, dbq):
doc_id_label = META_LABEL__RZ_DOC_PREFIX + self.doc_id
rgx__doc_label = re.compile(r'%s[\w\d_]+' % (META_LABEL__RZ_DOC_PREFIX))
assert None != rgx__doc_label.match(doc_id_label), 'Illegal doc ID label: %s' % (doc_id_label) # validate doc label
q_type = dbq.query_struct_type
c_set = [] # clause set
if Query_Struct_Type.w == q_type:
c_set += dbq.pt_root.clause_set_by_kw('create')
if Query_Struct_Type.r == q_type:
c_set += dbq.pt_root.clause_set_by_kw('match')
if Query_Struct_Type.rw == q_type:
c_set += dbq.pt_root.clause_set_by_kw('create')
c_set += dbq.pt_root.clause_set_by_kw('match')
for c in c_set:
set_of_lbl_set = c.sub_exp_set_by_type(e_label_set, recurse=True)
if not set_of_lbl_set: # no label set
p_node_or_path_set = c.sub_exp_set_by_type([p_node], recurse=True)
def f_visit(n, ctx, depth):
if isinstance(n, e_ident) and n.parent.__class__ in [p_node]:
lbl_set = n.spawn_sibling__adjacent(e_label_set)
lbl = lbl_set.spawn_child(e_value)
lbl.value = doc_id_label
for p_exp in p_node_or_path_set:
p_exp.tree_walk__pre(f_visit=f_visit)
else: # append to existing label set
for lbl_set in set_of_lbl_set:
if isinstance(lbl_set.parent, p_node):
lbl = lbl_set.spawn_child(e_value)
lbl.value = doc_id_label
# log.debug('db_q trans: in clause: %s, out clause: %s' % (cur_clause, new_clause))
"""
"""
@property
def query_struct_type(self):
"""
calc query_structure_type: read|write|read-write
"""
if kw == 'match':
|
