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text_util.bzl
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174 lines (143 loc) · 4.67 KB
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# Copyright 2023 The Bazel Authors. All rights reserved.
#
# 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.
"""Text manipulation utilities useful for repository rule writing."""
def _indent(text, indent = " " * 4):
if "\n" not in text:
return indent + text
return "\n".join([indent + line for line in text.splitlines()])
def _hanging_indent(text, indent = " " * 4):
if "\n" not in text:
return text
lines = text.splitlines()
for i, line in enumerate(lines):
lines[i] = (indent if i != 0 else "") + line
return "\n".join(lines)
def _render_alias(name, actual, *, visibility = None):
args = [
"name = \"{}\",".format(name),
"actual = {},".format(actual),
]
if visibility:
args.append("visibility = {},".format(render.list(visibility)))
return "\n".join([
"alias(",
] + [_indent(arg) for arg in args] + [
")",
])
def _render_dict(d, *, key_repr = repr, value_repr = repr):
if not d:
return "{}"
return "\n".join([
"{",
_indent("\n".join([
"{}: {},".format(key_repr(k), value_repr(v))
for k, v in d.items()
])),
"}",
])
def _render_select(selects, *, no_match_error = None, key_repr = repr, value_repr = repr, name = "select"):
dict_str = _render_dict(selects, key_repr = key_repr, value_repr = value_repr) + ","
if no_match_error:
args = "\n".join([
"",
_indent(dict_str),
_indent("no_match_error = {},".format(no_match_error)),
"",
])
else:
args = "\n".join([
"",
_indent(dict_str),
"",
])
return "{}({})".format(name, args)
def _render_list(items, *, hanging_indent = ""):
"""Convert a list to formatted text.
Args:
items: list of items.
hanging_indent: str, indent to apply to second and following lines of
the formatted text.
Returns:
The list pretty formatted as a string.
"""
if not items:
return "[]"
if len(items) == 1:
return "[{}]".format(repr(items[0]))
text = "\n".join([
"[",
_indent("\n".join([
"{},".format(repr(item))
for item in items
])),
"]",
])
if hanging_indent:
text = _hanging_indent(text, hanging_indent)
return text
def _render_str(value):
return repr(value)
def _render_string_list_dict(value):
"""Render an attr.string_list_dict value (`dict[str, list[str]`)"""
return _render_dict(value, value_repr = _render_list)
def _render_tuple(items, *, value_repr = repr):
if not items:
return "tuple()"
if len(items) == 1:
return "({},)".format(value_repr(items[0]))
return "\n".join([
"(",
_indent("\n".join([
"{},".format(value_repr(item))
for item in items
])),
")",
])
def _render_kwargs(items, *, value_repr = repr):
if not items:
return ""
return "\n".join([
"{} = {},".format(k, value_repr(v)).lstrip()
for k, v in items.items()
])
def _render_call(fn_name, **kwargs):
if not kwargs:
return fn_name + "()"
return "{}(\n{}\n)".format(fn_name, _indent(_render_kwargs(kwargs, value_repr = lambda x: x)))
def _toolchain_prefix(index, name, pad_length):
"""Prefixes the given name with the index, padded with zeros to ensure lexicographic sorting.
Examples:
toolchain_prefix( 2, "foo", 4) == "_0002_foo_"
toolchain_prefix(2000, "foo", 4) == "_2000_foo_"
"""
return "_{}_{}_".format(_left_pad_zero(index, pad_length), name)
def _left_pad_zero(index, length):
if index < 0:
fail("index must be non-negative")
return ("0" * length + str(index))[-length:]
render = struct(
alias = _render_alias,
dict = _render_dict,
call = _render_call,
hanging_indent = _hanging_indent,
indent = _indent,
kwargs = _render_kwargs,
left_pad_zero = _left_pad_zero,
list = _render_list,
select = _render_select,
str = _render_str,
toolchain_prefix = _toolchain_prefix,
tuple = _render_tuple,
string_list_dict = _render_string_list_dict,
)