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import dataclasses
import os
import re
from enum import IntEnum
from typing import FrozenSet, NoReturn, Optional, Set, Mapping, TYPE_CHECKING, Self
from debputy.architecture_support import (
dpkg_architecture_table,
DpkgArchitectureBuildProcessValuesTable,
)
from debputy.exceptions import DebputySubstitutionError
from debputy.util import glob_escape
if TYPE_CHECKING:
from debputy.plugin.api.feature_set import PluginProvidedFeatureSet
from debputy.plugin.api import VirtualPath
SUBST_VAR_RE = re.compile(
r"""
([{][{][ ]*)
(
_?[A-Za-z0-9]+
(?:[-_:][A-Za-z0-9]+)*
)
([ ]*[}][}])
""",
re.VERBOSE,
)
class VariableNameState(IntEnum):
UNDEFINED = 1
RESERVED = 2
DEFINED = 3
@dataclasses.dataclass(slots=True, frozen=True)
class VariableContext:
debian_dir: "VirtualPath"
class Substitution:
def substitute(
self,
value: str,
definition_source: str,
/,
escape_glob_characters: bool = False,
) -> str:
raise NotImplementedError
def with_extra_substitutions(self, **extra_substitutions: str) -> "Substitution":
raise NotImplementedError
def with_unresolvable_substitutions(
self, *extra_substitutions: str
) -> "Substitution":
raise NotImplementedError
def variable_state(self, variable_name: str) -> VariableNameState:
return VariableNameState.UNDEFINED
def is_used(self, variable_name: str) -> bool:
return False
def _mark_used(self, variable_name: str) -> None:
pass
def _replacement(self, matched_key: str, definition_source: str) -> str:
self._error(
"Cannot resolve {{" + matched_key + "}}."
f" The error occurred while trying to process {definition_source}"
)
def _error(
self,
msg: str,
*,
caused_by: Optional[BaseException] = None,
) -> NoReturn:
raise DebputySubstitutionError(msg) from caused_by
def _apply_substitution(
self,
pattern: re.Pattern[str],
value: str,
definition_source: str,
/,
escape_glob_characters: bool = False,
) -> str:
replacement = value
offset = 0
for match in pattern.finditer(value):
prefix, matched_key, suffix = match.groups()
replacement_value = self._replacement(matched_key, definition_source)
self._mark_used(matched_key)
if escape_glob_characters:
replacement_value = glob_escape(replacement_value)
s, e = match.span()
s += offset
e += offset
replacement = replacement[:s] + replacement_value + replacement[e:]
token_fluff_len = len(prefix) + len(suffix)
offset += len(replacement_value) - len(matched_key) - token_fluff_len
return replacement
class NullSubstitution(Substitution):
def substitute(
self,
value: str,
definition_source: str,
/,
escape_glob_characters: bool = False,
) -> str:
return value
def with_extra_substitutions(self, **extra_substitutions: str) -> "Substitution":
return self
def with_unresolvable_substitutions(
self, *extra_substitutions: str
) -> "Substitution":
return self
NULL_SUBSTITUTION = NullSubstitution()
del NullSubstitution
class SubstitutionImpl(Substitution):
__slots__ = (
"_used",
"_env",
"_plugin_feature_set",
"_static_variables",
"_unresolvable_substitutions",
"_dpkg_arch_table",
"_parent",
"_variable_context",
)
def __init__(
self,
/,
plugin_feature_set: Optional["PluginProvidedFeatureSet"] = None,
static_variables: Optional[Mapping[str, str]] = None,
unresolvable_substitutions: FrozenSet[str] = frozenset(),
dpkg_arch_table: Optional[DpkgArchitectureBuildProcessValuesTable] = None,
environment: Optional[Mapping[str, str]] = None,
parent: Optional["SubstitutionImpl"] = None,
variable_context: Optional[VariableContext] = None,
) -> None:
self._used: Set[str] = set()
self._plugin_feature_set = plugin_feature_set
self._static_variables = (
dict(static_variables) if static_variables is not None else None
)
self._unresolvable_substitutions = unresolvable_substitutions
self._dpkg_arch_table = (
dpkg_arch_table
if dpkg_arch_table is not None
else dpkg_architecture_table()
)
self._env = environment if environment is not None else os.environ
self._parent = parent
if variable_context is not None:
self._variable_context = variable_context
elif self._parent is not None:
self._variable_context = self._parent._variable_context
else:
raise ValueError(
"variable_context is required either directly or via the parent"
)
def copy_for_subst_test(
self,
plugin_feature_set: "PluginProvidedFeatureSet",
variable_context: VariableContext,
*,
extra_substitutions: Optional[Mapping[str, str]] = None,
environment: Optional[Mapping[str, str]] = None,
) -> "Self":
extra_substitutions_impl = (
dict(self._static_variables.items()) if self._static_variables else {}
)
if extra_substitutions:
extra_substitutions_impl.update(extra_substitutions)
return self.__class__(
plugin_feature_set=plugin_feature_set,
variable_context=variable_context,
static_variables=extra_substitutions_impl,
unresolvable_substitutions=self._unresolvable_substitutions,
dpkg_arch_table=self._dpkg_arch_table,
environment=environment if environment is not None else {},
)
def variable_state(self, key: str) -> VariableNameState:
if key.startswith("DEB_"):
if key in self._dpkg_arch_table:
return VariableNameState.DEFINED
return VariableNameState.RESERVED
plugin_feature_set = self._plugin_feature_set
if (
plugin_feature_set is not None
and key in plugin_feature_set.manifest_variables
):
return VariableNameState.DEFINED
if key.startswith("env:"):
k = key[4:]
if k in self._env:
return VariableNameState.DEFINED
return VariableNameState.RESERVED
if self._static_variables is not None and key in self._static_variables:
return VariableNameState.DEFINED
if key in self._unresolvable_substitutions:
return VariableNameState.RESERVED
if self._parent is not None:
return self._parent.variable_state(key)
return VariableNameState.UNDEFINED
def is_used(self, variable_name: str) -> bool:
if variable_name in self._used:
return True
parent = self._parent
if parent is not None:
return parent.is_used(variable_name)
return False
def _mark_used(self, variable_name: str) -> None:
p = self._parent
while p:
# Find the parent that has the variable if possible. This ensures that is_used works
# correctly.
if p._static_variables is not None and variable_name in p._static_variables:
p._mark_used(variable_name)
break
plugin_feature_set = p._plugin_feature_set
if (
plugin_feature_set is not None
and variable_name in plugin_feature_set.manifest_variables
and not plugin_feature_set.manifest_variables[
variable_name
].is_documentation_placeholder
):
p._mark_used(variable_name)
break
p = p._parent
self._used.add(variable_name)
def _replacement(self, key: str, definition_source: str) -> str:
if key.startswith("DEB_") and key in self._dpkg_arch_table:
return self._dpkg_arch_table[key]
if key.startswith("env:"):
k = key[4:]
if k in self._env:
return self._env[k]
self._error(
f'The environment does not contain the variable "{key}" '
f"(error occurred while trying to process {definition_source})"
)
# The order between extra_substitution and plugin_feature_set is leveraged by
# the tests to implement mocking variables. If the order needs tweaking,
# you will need a custom resolver for the tests to support mocking.
static_variables = self._static_variables
if static_variables and key in static_variables:
return static_variables[key]
plugin_feature_set = self._plugin_feature_set
if plugin_feature_set is not None:
provided_var = plugin_feature_set.manifest_variables.get(key)
if (
provided_var is not None
and not provided_var.is_documentation_placeholder
):
v = provided_var.resolve(self._variable_context)
# cache it for next time.
if static_variables is None:
static_variables = {}
self._static_variables = static_variables
static_variables[key] = v
return v
if key in self._unresolvable_substitutions:
self._error(
"The variable {{" + key + "}}"
f" is not available while processing {definition_source}."
)
parent = self._parent
if parent is not None:
return parent._replacement(key, definition_source)
self._error(
"Cannot resolve {{" + key + "}}: it is not a known key."
f" The error occurred while trying to process {definition_source}"
)
def with_extra_substitutions(self, **extra_substitutions: str) -> "Substitution":
if not extra_substitutions:
return self
return SubstitutionImpl(
dpkg_arch_table=self._dpkg_arch_table,
environment=self._env,
static_variables=extra_substitutions,
parent=self,
)
def with_unresolvable_substitutions(
self,
*extra_substitutions: str,
) -> "Substitution":
if not extra_substitutions:
return self
return SubstitutionImpl(
dpkg_arch_table=self._dpkg_arch_table,
environment=self._env,
unresolvable_substitutions=frozenset(extra_substitutions),
parent=self,
)
def substitute(
self,
value: str,
definition_source: str,
/,
escape_glob_characters: bool = False,
) -> str:
if "{{" not in value:
return value
return self._apply_substitution(
SUBST_VAR_RE,
value,
definition_source,
escape_glob_characters=escape_glob_characters,
)
|