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# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Common logic needed by other modules."""
import contextlib
import dataclasses
import filecmp
import os
import shutil
import tempfile
import pathlib
import zipfile
# Only some methods respect line length, so this is more of a best-effort
# limit.
_TARGET_LINE_LENGTH = 100
@dataclasses.dataclass(frozen=True)
class JniMode:
is_hashing: bool = False
is_muxing: bool = False
is_per_file: bool = False
JniMode.MUXING = JniMode(is_muxing=True)
class StringBuilder:
def __init__(self):
self._sb = []
self._indent = 0
self._comment_indent = None
self._in_cpp_macro = False
self._cur_line_len = 0
def __call__(self, value):
lines = value.splitlines(keepends=True)
for line in lines:
# Add any applicable prefix.
if self._cur_line_len == 0:
if self._comment_indent is not None:
self._sb.append(' ' * self._comment_indent)
# Do not add trailing whitespace for blank lines.
prefix = '//' if line == '\n' else '// '
self._sb.append(prefix)
self._cur_line_len += self._comment_indent + len(prefix)
if line != '\n' and self._indent > 0:
self._sb.append(' ' * self._indent)
self._cur_line_len += self._indent
self._sb.append(line)
self._cur_line_len += len(line)
if line[-1] == '\n':
if self._in_cpp_macro:
self._sb[-1] = self._sb[-1][:-1]
remaining = _TARGET_LINE_LENGTH - self._cur_line_len - 1
if remaining > 0:
self._sb.append(' ' * remaining)
self._sb.append(' \\\n')
self._cur_line_len = 0
@contextlib.contextmanager
def _param_list_generator(self):
values = []
yield values
self.param_list(values)
def param_list(self, values=None):
if values is None:
return self._param_list_generator()
self('(')
if values:
punctuation_size = 2 * len(values) # punctuation: ", ()"
single_line_size = sum(len(v) for v in values) + punctuation_size
if self._cur_line_len + single_line_size < _TARGET_LINE_LENGTH:
self(', '.join(values))
else:
self('\n')
with self.indent(4):
self(',\n'.join(values))
self(')')
def line(self, value=None):
self(value)
self('\n')
@contextlib.contextmanager
def statement(self):
yield
self(';\n')
@contextlib.contextmanager
def section(self, section_title):
assert not self._in_cpp_macro
if not ''.join(self._sb[-2:]).endswith('\n\n'):
self('\n')
self(f'// {section_title}\n')
yield
self('\n')
@contextlib.contextmanager
def namespace(self, namespace_name):
if namespace_name is None:
yield
return
value = f' {namespace_name}' if namespace_name else ''
self(f'namespace{value} {{\n\n')
yield
if self._in_cpp_macro:
self(f'\n}} /* namespace{value} */\n')
else:
self(f'\n}} // namespace{value}\n')
@contextlib.contextmanager
def block(self, *, indent=2, after=None):
self(' {\n')
with self.indent(indent):
yield
if after:
self('}')
self(after)
self('\n')
else:
self('}\n')
@contextlib.contextmanager
def indent(self, amount):
self._indent += amount
yield
self._indent -= amount
@contextlib.contextmanager
def commented_section(self):
assert self._comment_indent is None
assert not self._in_cpp_macro
self._comment_indent = self._indent
self._indent = 0
yield
self._indent = self._comment_indent
self._comment_indent = None
@contextlib.contextmanager
def cpp_macro(self, macro_name):
assert self._indent == 0
assert not self._in_cpp_macro
self(f'#define {macro_name}()')
self._in_cpp_macro = True
self('\n')
with self.indent(2):
yield
self._in_cpp_macro = False
# Check that the last call to __call__ ended with a \n, which will result
# in self._sb ending with [indent, slash-and-newline].
assert self._cur_line_len == 0
assert self._sb[-1] == ' \\\n', 'was: ' + self._sb[-1]
assert self._sb[-2].isspace(), 'was: ' + self._sb[-2]
self._sb.pop()
self._sb[-1] = '\n'
def to_string(self):
return ''.join(self._sb)
def capitalize(value):
return value[0].upper() + value[1:]
def jni_mangle(name):
"""Performs JNI mangling on the given name."""
# https://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/design.html#wp615
return name.replace('_', '_1').replace('/', '_').replace('$', '_00024')
@contextlib.contextmanager
def atomic_output(path, mode='w+b'):
with tempfile.NamedTemporaryFile(mode, delete=False) as f:
try:
yield f
finally:
f.close()
if not (os.path.exists(path) and filecmp.cmp(f.name, path)):
pathlib.Path(path).parents[0].mkdir(parents=True, exist_ok=True)
shutil.move(f.name, path)
if os.path.exists(f.name):
os.unlink(f.name)
def add_to_zip_hermetic(zip_file, zip_path, data=None):
zipinfo = zipfile.ZipInfo(filename=zip_path)
zipinfo.external_attr = 0o644 << 16
zipinfo.date_time = (2001, 1, 1, 0, 0, 0)
zip_file.writestr(zipinfo, data, zipfile.ZIP_STORED)
def should_rename_package(package_name, filter_list_string):
# If the filter list is empty, all packages should be renamed.
if not filter_list_string:
return True
return any(
package_name.startswith(pkg_prefix)
for pkg_prefix in filter_list_string.split(':'))
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