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from strictyaml.ruamel.comments import CommentedSeq, CommentedMap
from strictyaml.ruamel import dump, RoundTripDumper
from copy import deepcopy
import sys
if sys.version_info[0] == 3:
unicode = str
class YAMLPointer(object):
"""
A sequence of indexes/keys that look up a specific chunk of a YAML document.
A YAML pointer can point to a key, value, item in a sequence or part of a string
in a value or item.
"""
def __init__(self):
self._indices = []
@property
def last_index(self):
assert self.is_index()
return self._indices[-1][1]
@property
def last_val(self):
assert self.is_val()
return self._indices[-1][1]
@property
def last_strictkey(self):
assert self.is_key() or self.is_val()
return self._indices[-1][1][1]
@property
def last_regularkey(self):
assert self.is_key() or self.is_val()
return self._indices[-1][1][0]
def val(self, regularkey, strictkey):
assert isinstance(regularkey, (str, unicode)), type(regularkey)
assert isinstance(strictkey, (str, unicode)), type(strictkey)
new_location = deepcopy(self)
new_location._indices.append(("val", (regularkey, strictkey)))
return new_location
def is_val(self):
return self._indices[-1][0] == "val"
def key(self, regularkey, strictkey):
assert isinstance(regularkey, (str, unicode)), type(regularkey)
assert isinstance(strictkey, (str, unicode)), type(strictkey)
new_location = deepcopy(self)
new_location._indices.append(("key", (regularkey, strictkey)))
return new_location
def is_key(self):
return self._indices[-1][0] == "key"
def index(self, index):
new_location = deepcopy(self)
new_location._indices.append(("index", index))
return new_location
def is_index(self):
return self._indices[-1][0] == "index"
def textslice(self, start, end):
new_location = deepcopy(self)
new_location._indices.append(("textslice", (start, end)))
return new_location
def is_textslice(self):
return self._indices[-1][0] == "textslice"
def parent(self):
new_location = deepcopy(self)
new_location._indices = new_location._indices[:-1]
return new_location
def make_child_of(self, pointer):
new_indices = deepcopy(pointer._indices)
new_indices.extend(self._indices)
def _slice_segment(self, indices, segment, include_selected):
slicedpart = deepcopy(segment)
if len(indices) == 0 and not include_selected:
slicedpart = None
else:
if len(indices) > 0:
if indices[0][0] in ("val", "key"):
index = indices[0][1][0]
else:
index = indices[0][1]
start_popping = False
if isinstance(segment, CommentedMap):
for key in segment.keys():
if start_popping:
slicedpart.pop(key)
if index == key:
start_popping = True
if isinstance(segment[index], (CommentedSeq, CommentedMap)):
slicedpart[index] = self._slice_segment(
indices[1:],
segment[index],
include_selected=include_selected,
)
if not include_selected and len(indices) == 1:
slicedpart.pop(key)
if isinstance(segment, CommentedSeq):
for i, value in enumerate(segment):
if start_popping:
del slicedpart[-1]
if i == index:
start_popping = True
if isinstance(segment[index], (CommentedSeq, CommentedMap)):
slicedpart[index] = self._slice_segment(
indices[1:],
segment[index],
include_selected=include_selected,
)
if not include_selected and len(indices) == 1:
slicedpart.pop(index)
return slicedpart
def start_line(self, document):
slicedpart = self._slice_segment(
self._indices, document, include_selected=False
)
if slicedpart is None or slicedpart == {} or slicedpart == []:
return 1
else:
return (
len(dump(slicedpart, Dumper=RoundTripDumper).rstrip().split("\n")) + 1
)
def end_line(self, document):
slicedpart = self._slice_segment(self._indices, document, include_selected=True)
return len(dump(slicedpart, Dumper=RoundTripDumper).rstrip().split("\n"))
def lines(self, document):
return "\n".join(
dump(document, Dumper=RoundTripDumper).split("\n")[
self.start_line(document) - 1 : self.end_line(document)
]
)
def lines_before(self, document, how_many):
return "\n".join(
dump(document, Dumper=RoundTripDumper).split("\n")[
self.start_line(document) - 1 - how_many : self.start_line(document) - 1
]
)
def lines_after(self, document, how_many):
return "\n".join(
dump(document, Dumper=RoundTripDumper).split("\n")[
self.end_line(document) : self.end_line(document) + how_many
]
)
def _individual_get(self, segment, index_type, index, strictdoc):
if index_type == "val":
for key, value in segment.items():
if key == index[0]:
return value
if hasattr(key, "text"):
if key.text == index[0]:
return value
raise Exception("Invalid state")
elif index_type == "index":
return segment[index]
elif index_type == "textslice":
return segment[index[0] : index[1]]
elif index_type == "key":
return index[1] if strictdoc else index[0]
else:
raise Exception("Invalid state")
def get(self, document, strictdoc=False):
segment = document
for index_type, index in self._indices:
segment = self._individual_get(segment, index_type, index, strictdoc)
return segment
def set(self, src_obj, src_attr, new_ruamel, strictdoc=False):
"""Since set() needs to overwrite what this pointer points to, it
affects the parent object. Therefore, rather than taking "document"
as get(), it takes the object which holds the document and the name
of the property which is the document.
"""
obj_last = src_obj
key_last = src_attr
r = getattr(src_obj, src_attr)
for index_type, index in self._indices:
obj_last = r
if index_type == "val":
key_last = index[1] if strictdoc else index[0]
r = r[key_last]
elif index_type == "index":
key_last = index
r = r[key_last]
elif index_type == "textslice":
key_last = None
r = r[index[0] : index[1]]
elif index_type == "key":
key_last = None
r = index[1] if strictdoc else index[0]
else:
raise RuntimeError("Invalid state")
if obj_last is src_obj:
# Starts with an attribute set
setattr(src_obj, src_attr, new_ruamel)
elif key_last is not None:
# Others are item set
if hasattr(obj_last, "_value"):
# Only want to overwrite value, do NOT re-validate schema...
obj_last._value[key_last] = new_ruamel
else:
obj_last[key_last] = new_ruamel
else:
raise NotImplementedError("invalid key, cannot set")
def __repr__(self):
return "<YAMLPointer: {0}>".format(self._indices)
|
