forked from pydata/xarray
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathdatatree_render.py
More file actions
278 lines (242 loc) · 8.1 KB
/
Copy pathdatatree_render.py
File metadata and controls
278 lines (242 loc) · 8.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
"""
String Tree Rendering. Copied from anytree.
Minor changes to `RenderDataTree` include accessing `children.values()`, and
type hints.
"""
from __future__ import annotations
from collections import namedtuple
from collections.abc import Iterable, Iterator
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from xarray.core.datatree import DataTree
Row = namedtuple("Row", ("pre", "fill", "node"))
class AbstractStyle:
def __init__(self, vertical: str, cont: str, end: str):
"""
Tree Render Style.
Args:
vertical: Sign for vertical line.
cont: Chars for a continued branch.
end: Chars for the last branch.
"""
super().__init__()
self.vertical = vertical
self.cont = cont
self.end = end
assert (
len(cont) == len(vertical) == len(end)
), f"'{vertical}', '{cont}' and '{end}' need to have equal length"
@property
def empty(self) -> str:
"""Empty string as placeholder."""
return " " * len(self.end)
def __repr__(self) -> str:
return f"{self.__class__.__name__}()"
class ContStyle(AbstractStyle):
def __init__(self):
"""
Continued style, without gaps.
>>> from xarray.core.datatree import DataTree
>>> from xarray.core.datatree_render import RenderDataTree
>>> root = DataTree.from_dict(
... {
... "/": None,
... "/sub0": None,
... "/sub0/sub0B": None,
... "/sub0/sub0A": None,
... "/sub1": None,
... },
... name="root",
... )
>>> print(RenderDataTree(root))
<xarray.DataTree 'root'>
Group: /
├── Group: /sub0
│ ├── Group: /sub0/sub0B
│ └── Group: /sub0/sub0A
└── Group: /sub1
"""
super().__init__("\u2502 ", "\u251c\u2500\u2500 ", "\u2514\u2500\u2500 ")
class RenderDataTree:
def __init__(
self,
node: DataTree,
style=None,
childiter: type = list,
maxlevel: int | None = None,
):
"""
Render tree starting at `node`.
Keyword Args:
style (AbstractStyle): Render Style.
childiter: Child iterator. Note, due to the use of node.children.values(),
Iterables that change the order of children cannot be used
(e.g., `reversed`).
maxlevel: Limit rendering to this depth.
:any:`RenderDataTree` is an iterator, returning a tuple with 3 items:
`pre`
tree prefix.
`fill`
filling for multiline entries.
`node`
:any:`NodeMixin` object.
It is up to the user to assemble these parts to a whole.
Examples
--------
>>> from xarray import Dataset
>>> from xarray.core.datatree import DataTree
>>> from xarray.core.datatree_render import RenderDataTree
>>> root = DataTree.from_dict(
... {
... "/": Dataset({"a": 0, "b": 1}),
... "/sub0": Dataset({"c": 2, "d": 3}),
... "/sub0/sub0B": Dataset({"e": 4}),
... "/sub0/sub0A": Dataset({"f": 5, "g": 6}),
... "/sub1": Dataset({"h": 7}),
... },
... name="root",
... )
# Simple one line:
>>> for pre, _, node in RenderDataTree(root):
... print(f"{pre}{node.name}")
...
root
├── sub0
│ ├── sub0B
│ └── sub0A
└── sub1
# Multiline:
>>> for pre, fill, node in RenderDataTree(root):
... print(f"{pre}{node.name}")
... for variable in node.variables:
... print(f"{fill}{variable}")
...
root
a
b
├── sub0
│ c
│ d
│ ├── sub0B
│ │ e
│ └── sub0A
│ f
│ g
└── sub1
h
:any:`by_attr` simplifies attribute rendering and supports multiline:
>>> print(RenderDataTree(root).by_attr())
root
├── sub0
│ ├── sub0B
│ └── sub0A
└── sub1
# `maxlevel` limits the depth of the tree:
>>> print(RenderDataTree(root, maxlevel=2).by_attr("name"))
root
├── sub0
└── sub1
"""
if style is None:
style = ContStyle()
if not isinstance(style, AbstractStyle):
style = style()
self.node = node
self.style = style
self.childiter = childiter
self.maxlevel = maxlevel
def __iter__(self) -> Iterator[Row]:
return self.__next(self.node, tuple())
def __next(
self, node: DataTree, continues: tuple[bool, ...], level: int = 0
) -> Iterator[Row]:
yield RenderDataTree.__item(node, continues, self.style)
children = node.children.values()
level += 1
if children and (self.maxlevel is None or level < self.maxlevel):
children = self.childiter(children)
for child, is_last in _is_last(children):
yield from self.__next(child, continues + (not is_last,), level=level)
@staticmethod
def __item(
node: DataTree, continues: tuple[bool, ...], style: AbstractStyle
) -> Row:
if not continues:
return Row("", "", node)
else:
items = [style.vertical if cont else style.empty for cont in continues]
indent = "".join(items[:-1])
branch = style.cont if continues[-1] else style.end
pre = indent + branch
fill = "".join(items)
return Row(pre, fill, node)
def __str__(self) -> str:
return str(self.node)
def __repr__(self) -> str:
classname = self.__class__.__name__
args = [
repr(self.node),
f"style={self.style!r}",
f"childiter={self.childiter!r}",
]
return f"{classname}({', '.join(args)})"
def by_attr(self, attrname: str = "name") -> str:
"""
Return rendered tree with node attribute `attrname`.
Examples
--------
>>> from xarray import Dataset
>>> from xarray.core.datatree import DataTree
>>> from xarray.core.datatree_render import RenderDataTree
>>> root = DataTree.from_dict(
... {
... "/sub0/sub0B": Dataset({"foo": 4, "bar": 109}),
... "/sub0/sub0A": None,
... "/sub1/sub1A": None,
... "/sub1/sub1B": Dataset({"bar": 8}),
... "/sub1/sub1C/sub1Ca": None,
... },
... name="root",
... )
>>> print(RenderDataTree(root).by_attr("name"))
root
├── sub0
│ ├── sub0B
│ └── sub0A
└── sub1
├── sub1A
├── sub1B
└── sub1C
└── sub1Ca
"""
def get() -> Iterator[str]:
for pre, fill, node in self:
attr = (
attrname(node)
if callable(attrname)
else getattr(node, attrname, "")
)
if isinstance(attr, list | tuple):
lines = attr
else:
lines = str(attr).split("\n")
yield f"{pre}{lines[0]}"
for line in lines[1:]:
yield f"{fill}{line}"
return "\n".join(get())
def _is_last(iterable: Iterable) -> Iterator[tuple[DataTree, bool]]:
iter_ = iter(iterable)
try:
nextitem = next(iter_)
except StopIteration:
pass
else:
item = nextitem
while True:
try:
nextitem = next(iter_)
yield item, False
except StopIteration:
yield nextitem, True
break
item = nextitem