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-rw-r--r--third_party/python/Jinja2/jinja2/compiler.py1957
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diff --git a/third_party/python/Jinja2/jinja2/compiler.py b/third_party/python/Jinja2/jinja2/compiler.py
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+"""Compiles nodes from the parser into Python code."""
+import typing as t
+from contextlib import contextmanager
+from functools import update_wrapper
+from io import StringIO
+from itertools import chain
+from keyword import iskeyword as is_python_keyword
+
+from markupsafe import escape
+from markupsafe import Markup
+
+from . import nodes
+from .exceptions import TemplateAssertionError
+from .idtracking import Symbols
+from .idtracking import VAR_LOAD_ALIAS
+from .idtracking import VAR_LOAD_PARAMETER
+from .idtracking import VAR_LOAD_RESOLVE
+from .idtracking import VAR_LOAD_UNDEFINED
+from .nodes import EvalContext
+from .optimizer import Optimizer
+from .utils import _PassArg
+from .utils import concat
+from .visitor import NodeVisitor
+
+if t.TYPE_CHECKING:
+ import typing_extensions as te
+ from .environment import Environment
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+
+operators = {
+ "eq": "==",
+ "ne": "!=",
+ "gt": ">",
+ "gteq": ">=",
+ "lt": "<",
+ "lteq": "<=",
+ "in": "in",
+ "notin": "not in",
+}
+
+
+def optimizeconst(f: F) -> F:
+ def new_func(
+ self: "CodeGenerator", node: nodes.Expr, frame: "Frame", **kwargs: t.Any
+ ) -> t.Any:
+ # Only optimize if the frame is not volatile
+ if self.optimizer is not None and not frame.eval_ctx.volatile:
+ new_node = self.optimizer.visit(node, frame.eval_ctx)
+
+ if new_node != node:
+ return self.visit(new_node, frame)
+
+ return f(self, node, frame, **kwargs)
+
+ return update_wrapper(t.cast(F, new_func), f)
+
+
+def _make_binop(op: str) -> t.Callable[["CodeGenerator", nodes.BinExpr, "Frame"], None]:
+ @optimizeconst
+ def visitor(self: "CodeGenerator", node: nodes.BinExpr, frame: Frame) -> None:
+ if (
+ self.environment.sandboxed
+ and op in self.environment.intercepted_binops # type: ignore
+ ):
+ self.write(f"environment.call_binop(context, {op!r}, ")
+ self.visit(node.left, frame)
+ self.write(", ")
+ self.visit(node.right, frame)
+ else:
+ self.write("(")
+ self.visit(node.left, frame)
+ self.write(f" {op} ")
+ self.visit(node.right, frame)
+
+ self.write(")")
+
+ return visitor
+
+
+def _make_unop(
+ op: str,
+) -> t.Callable[["CodeGenerator", nodes.UnaryExpr, "Frame"], None]:
+ @optimizeconst
+ def visitor(self: "CodeGenerator", node: nodes.UnaryExpr, frame: Frame) -> None:
+ if (
+ self.environment.sandboxed
+ and op in self.environment.intercepted_unops # type: ignore
+ ):
+ self.write(f"environment.call_unop(context, {op!r}, ")
+ self.visit(node.node, frame)
+ else:
+ self.write("(" + op)
+ self.visit(node.node, frame)
+
+ self.write(")")
+
+ return visitor
+
+
+def generate(
+ node: nodes.Template,
+ environment: "Environment",
+ name: t.Optional[str],
+ filename: t.Optional[str],
+ stream: t.Optional[t.TextIO] = None,
+ defer_init: bool = False,
+ optimized: bool = True,
+) -> t.Optional[str]:
+ """Generate the python source for a node tree."""
+ if not isinstance(node, nodes.Template):
+ raise TypeError("Can't compile non template nodes")
+
+ generator = environment.code_generator_class(
+ environment, name, filename, stream, defer_init, optimized
+ )
+ generator.visit(node)
+
+ if stream is None:
+ return generator.stream.getvalue() # type: ignore
+
+ return None
+
+
+def has_safe_repr(value: t.Any) -> bool:
+ """Does the node have a safe representation?"""
+ if value is None or value is NotImplemented or value is Ellipsis:
+ return True
+
+ if type(value) in {bool, int, float, complex, range, str, Markup}:
+ return True
+
+ if type(value) in {tuple, list, set, frozenset}:
+ return all(has_safe_repr(v) for v in value)
+
+ if type(value) is dict:
+ return all(has_safe_repr(k) and has_safe_repr(v) for k, v in value.items())
+
+ return False
+
+
+def find_undeclared(
+ nodes: t.Iterable[nodes.Node], names: t.Iterable[str]
+) -> t.Set[str]:
+ """Check if the names passed are accessed undeclared. The return value
+ is a set of all the undeclared names from the sequence of names found.
+ """
+ visitor = UndeclaredNameVisitor(names)
+ try:
+ for node in nodes:
+ visitor.visit(node)
+ except VisitorExit:
+ pass
+ return visitor.undeclared
+
+
+class MacroRef:
+ def __init__(self, node: t.Union[nodes.Macro, nodes.CallBlock]) -> None:
+ self.node = node
+ self.accesses_caller = False
+ self.accesses_kwargs = False
+ self.accesses_varargs = False
+
+
+class Frame:
+ """Holds compile time information for us."""
+
+ def __init__(
+ self,
+ eval_ctx: EvalContext,
+ parent: t.Optional["Frame"] = None,
+ level: t.Optional[int] = None,
+ ) -> None:
+ self.eval_ctx = eval_ctx
+
+ # the parent of this frame
+ self.parent = parent
+
+ if parent is None:
+ self.symbols = Symbols(level=level)
+
+ # in some dynamic inheritance situations the compiler needs to add
+ # write tests around output statements.
+ self.require_output_check = False
+
+ # inside some tags we are using a buffer rather than yield statements.
+ # this for example affects {% filter %} or {% macro %}. If a frame
+ # is buffered this variable points to the name of the list used as
+ # buffer.
+ self.buffer: t.Optional[str] = None
+
+ # the name of the block we're in, otherwise None.
+ self.block: t.Optional[str] = None
+
+ else:
+ self.symbols = Symbols(parent.symbols, level=level)
+ self.require_output_check = parent.require_output_check
+ self.buffer = parent.buffer
+ self.block = parent.block
+
+ # a toplevel frame is the root + soft frames such as if conditions.
+ self.toplevel = False
+
+ # the root frame is basically just the outermost frame, so no if
+ # conditions. This information is used to optimize inheritance
+ # situations.
+ self.rootlevel = False
+
+ # variables set inside of loops and blocks should not affect outer frames,
+ # but they still needs to be kept track of as part of the active context.
+ self.loop_frame = False
+ self.block_frame = False
+
+ # track whether the frame is being used in an if-statement or conditional
+ # expression as it determines which errors should be raised during runtime
+ # or compile time.
+ self.soft_frame = False
+
+ def copy(self) -> "Frame":
+ """Create a copy of the current one."""
+ rv = object.__new__(self.__class__)
+ rv.__dict__.update(self.__dict__)
+ rv.symbols = self.symbols.copy()
+ return rv
+
+ def inner(self, isolated: bool = False) -> "Frame":
+ """Return an inner frame."""
+ if isolated:
+ return Frame(self.eval_ctx, level=self.symbols.level + 1)
+ return Frame(self.eval_ctx, self)
+
+ def soft(self) -> "Frame":
+ """Return a soft frame. A soft frame may not be modified as
+ standalone thing as it shares the resources with the frame it
+ was created of, but it's not a rootlevel frame any longer.
+
+ This is only used to implement if-statements and conditional
+ expressions.
+ """
+ rv = self.copy()
+ rv.rootlevel = False
+ rv.soft_frame = True
+ return rv
+
+ __copy__ = copy
+
+
+class VisitorExit(RuntimeError):
+ """Exception used by the `UndeclaredNameVisitor` to signal a stop."""
+
+
+class DependencyFinderVisitor(NodeVisitor):
+ """A visitor that collects filter and test calls."""
+
+ def __init__(self) -> None:
+ self.filters: t.Set[str] = set()
+ self.tests: t.Set[str] = set()
+
+ def visit_Filter(self, node: nodes.Filter) -> None:
+ self.generic_visit(node)
+ self.filters.add(node.name)
+
+ def visit_Test(self, node: nodes.Test) -> None:
+ self.generic_visit(node)
+ self.tests.add(node.name)
+
+ def visit_Block(self, node: nodes.Block) -> None:
+ """Stop visiting at blocks."""
+
+
+class UndeclaredNameVisitor(NodeVisitor):
+ """A visitor that checks if a name is accessed without being
+ declared. This is different from the frame visitor as it will
+ not stop at closure frames.
+ """
+
+ def __init__(self, names: t.Iterable[str]) -> None:
+ self.names = set(names)
+ self.undeclared: t.Set[str] = set()
+
+ def visit_Name(self, node: nodes.Name) -> None:
+ if node.ctx == "load" and node.name in self.names:
+ self.undeclared.add(node.name)
+ if self.undeclared == self.names:
+ raise VisitorExit()
+ else:
+ self.names.discard(node.name)
+
+ def visit_Block(self, node: nodes.Block) -> None:
+ """Stop visiting a blocks."""
+
+
+class CompilerExit(Exception):
+ """Raised if the compiler encountered a situation where it just
+ doesn't make sense to further process the code. Any block that
+ raises such an exception is not further processed.
+ """
+
+
+class CodeGenerator(NodeVisitor):
+ def __init__(
+ self,
+ environment: "Environment",
+ name: t.Optional[str],
+ filename: t.Optional[str],
+ stream: t.Optional[t.TextIO] = None,
+ defer_init: bool = False,
+ optimized: bool = True,
+ ) -> None:
+ if stream is None:
+ stream = StringIO()
+ self.environment = environment
+ self.name = name
+ self.filename = filename
+ self.stream = stream
+ self.created_block_context = False
+ self.defer_init = defer_init
+ self.optimizer: t.Optional[Optimizer] = None
+
+ if optimized:
+ self.optimizer = Optimizer(environment)
+
+ # aliases for imports
+ self.import_aliases: t.Dict[str, str] = {}
+
+ # a registry for all blocks. Because blocks are moved out
+ # into the global python scope they are registered here
+ self.blocks: t.Dict[str, nodes.Block] = {}
+
+ # the number of extends statements so far
+ self.extends_so_far = 0
+
+ # some templates have a rootlevel extends. In this case we
+ # can safely assume that we're a child template and do some
+ # more optimizations.
+ self.has_known_extends = False
+
+ # the current line number
+ self.code_lineno = 1
+
+ # registry of all filters and tests (global, not block local)
+ self.tests: t.Dict[str, str] = {}
+ self.filters: t.Dict[str, str] = {}
+
+ # the debug information
+ self.debug_info: t.List[t.Tuple[int, int]] = []
+ self._write_debug_info: t.Optional[int] = None
+
+ # the number of new lines before the next write()
+ self._new_lines = 0
+
+ # the line number of the last written statement
+ self._last_line = 0
+
+ # true if nothing was written so far.
+ self._first_write = True
+
+ # used by the `temporary_identifier` method to get new
+ # unique, temporary identifier
+ self._last_identifier = 0
+
+ # the current indentation
+ self._indentation = 0
+
+ # Tracks toplevel assignments
+ self._assign_stack: t.List[t.Set[str]] = []
+
+ # Tracks parameter definition blocks
+ self._param_def_block: t.List[t.Set[str]] = []
+
+ # Tracks the current context.
+ self._context_reference_stack = ["context"]
+
+ @property
+ def optimized(self) -> bool:
+ return self.optimizer is not None
+
+ # -- Various compilation helpers
+
+ def fail(self, msg: str, lineno: int) -> "te.NoReturn":
+ """Fail with a :exc:`TemplateAssertionError`."""
+ raise TemplateAssertionError(msg, lineno, self.name, self.filename)
+
+ def temporary_identifier(self) -> str:
+ """Get a new unique identifier."""
+ self._last_identifier += 1
+ return f"t_{self._last_identifier}"
+
+ def buffer(self, frame: Frame) -> None:
+ """Enable buffering for the frame from that point onwards."""
+ frame.buffer = self.temporary_identifier()
+ self.writeline(f"{frame.buffer} = []")
+
+ def return_buffer_contents(
+ self, frame: Frame, force_unescaped: bool = False
+ ) -> None:
+ """Return the buffer contents of the frame."""
+ if not force_unescaped:
+ if frame.eval_ctx.volatile:
+ self.writeline("if context.eval_ctx.autoescape:")
+ self.indent()
+ self.writeline(f"return Markup(concat({frame.buffer}))")
+ self.outdent()
+ self.writeline("else:")
+ self.indent()
+ self.writeline(f"return concat({frame.buffer})")
+ self.outdent()
+ return
+ elif frame.eval_ctx.autoescape:
+ self.writeline(f"return Markup(concat({frame.buffer}))")
+ return
+ self.writeline(f"return concat({frame.buffer})")
+
+ def indent(self) -> None:
+ """Indent by one."""
+ self._indentation += 1
+
+ def outdent(self, step: int = 1) -> None:
+ """Outdent by step."""
+ self._indentation -= step
+
+ def start_write(self, frame: Frame, node: t.Optional[nodes.Node] = None) -> None:
+ """Yield or write into the frame buffer."""
+ if frame.buffer is None:
+ self.writeline("yield ", node)
+ else:
+ self.writeline(f"{frame.buffer}.append(", node)
+
+ def end_write(self, frame: Frame) -> None:
+ """End the writing process started by `start_write`."""
+ if frame.buffer is not None:
+ self.write(")")
+
+ def simple_write(
+ self, s: str, frame: Frame, node: t.Optional[nodes.Node] = None
+ ) -> None:
+ """Simple shortcut for start_write + write + end_write."""
+ self.start_write(frame, node)
+ self.write(s)
+ self.end_write(frame)
+
+ def blockvisit(self, nodes: t.Iterable[nodes.Node], frame: Frame) -> None:
+ """Visit a list of nodes as block in a frame. If the current frame
+ is no buffer a dummy ``if 0: yield None`` is written automatically.
+ """
+ try:
+ self.writeline("pass")
+ for node in nodes:
+ self.visit(node, frame)
+ except CompilerExit:
+ pass
+
+ def write(self, x: str) -> None:
+ """Write a string into the output stream."""
+ if self._new_lines:
+ if not self._first_write:
+ self.stream.write("\n" * self._new_lines)
+ self.code_lineno += self._new_lines
+ if self._write_debug_info is not None:
+ self.debug_info.append((self._write_debug_info, self.code_lineno))
+ self._write_debug_info = None
+ self._first_write = False
+ self.stream.write(" " * self._indentation)
+ self._new_lines = 0
+ self.stream.write(x)
+
+ def writeline(
+ self, x: str, node: t.Optional[nodes.Node] = None, extra: int = 0
+ ) -> None:
+ """Combination of newline and write."""
+ self.newline(node, extra)
+ self.write(x)
+
+ def newline(self, node: t.Optional[nodes.Node] = None, extra: int = 0) -> None:
+ """Add one or more newlines before the next write."""
+ self._new_lines = max(self._new_lines, 1 + extra)
+ if node is not None and node.lineno != self._last_line:
+ self._write_debug_info = node.lineno
+ self._last_line = node.lineno
+
+ def signature(
+ self,
+ node: t.Union[nodes.Call, nodes.Filter, nodes.Test],
+ frame: Frame,
+ extra_kwargs: t.Optional[t.Mapping[str, t.Any]] = None,
+ ) -> None:
+ """Writes a function call to the stream for the current node.
+ A leading comma is added automatically. The extra keyword
+ arguments may not include python keywords otherwise a syntax
+ error could occur. The extra keyword arguments should be given
+ as python dict.
+ """
+ # if any of the given keyword arguments is a python keyword
+ # we have to make sure that no invalid call is created.
+ kwarg_workaround = any(
+ is_python_keyword(t.cast(str, k))
+ for k in chain((x.key for x in node.kwargs), extra_kwargs or ())
+ )
+
+ for arg in node.args:
+ self.write(", ")
+ self.visit(arg, frame)
+
+ if not kwarg_workaround:
+ for kwarg in node.kwargs:
+ self.write(", ")
+ self.visit(kwarg, frame)
+ if extra_kwargs is not None:
+ for key, value in extra_kwargs.items():
+ self.write(f", {key}={value}")
+ if node.dyn_args:
+ self.write(", *")
+ self.visit(node.dyn_args, frame)
+
+ if kwarg_workaround:
+ if node.dyn_kwargs is not None:
+ self.write(", **dict({")
+ else:
+ self.write(", **{")
+ for kwarg in node.kwargs:
+ self.write(f"{kwarg.key!r}: ")
+ self.visit(kwarg.value, frame)
+ self.write(", ")
+ if extra_kwargs is not None:
+ for key, value in extra_kwargs.items():
+ self.write(f"{key!r}: {value}, ")
+ if node.dyn_kwargs is not None:
+ self.write("}, **")
+ self.visit(node.dyn_kwargs, frame)
+ self.write(")")
+ else:
+ self.write("}")
+
+ elif node.dyn_kwargs is not None:
+ self.write(", **")
+ self.visit(node.dyn_kwargs, frame)
+
+ def pull_dependencies(self, nodes: t.Iterable[nodes.Node]) -> None:
+ """Find all filter and test names used in the template and
+ assign them to variables in the compiled namespace. Checking
+ that the names are registered with the environment is done when
+ compiling the Filter and Test nodes. If the node is in an If or
+ CondExpr node, the check is done at runtime instead.
+
+ .. versionchanged:: 3.0
+ Filters and tests in If and CondExpr nodes are checked at
+ runtime instead of compile time.
+ """
+ visitor = DependencyFinderVisitor()
+
+ for node in nodes:
+ visitor.visit(node)
+
+ for id_map, names, dependency in (self.filters, visitor.filters, "filters"), (
+ self.tests,
+ visitor.tests,
+ "tests",
+ ):
+ for name in sorted(names):
+ if name not in id_map:
+ id_map[name] = self.temporary_identifier()
+
+ # add check during runtime that dependencies used inside of executed
+ # blocks are defined, as this step may be skipped during compile time
+ self.writeline("try:")
+ self.indent()
+ self.writeline(f"{id_map[name]} = environment.{dependency}[{name!r}]")
+ self.outdent()
+ self.writeline("except KeyError:")
+ self.indent()
+ self.writeline("@internalcode")
+ self.writeline(f"def {id_map[name]}(*unused):")
+ self.indent()
+ self.writeline(
+ f'raise TemplateRuntimeError("No {dependency[:-1]}'
+ f' named {name!r} found.")'
+ )
+ self.outdent()
+ self.outdent()
+
+ def enter_frame(self, frame: Frame) -> None:
+ undefs = []
+ for target, (action, param) in frame.symbols.loads.items():
+ if action == VAR_LOAD_PARAMETER:
+ pass
+ elif action == VAR_LOAD_RESOLVE:
+ self.writeline(f"{target} = {self.get_resolve_func()}({param!r})")
+ elif action == VAR_LOAD_ALIAS:
+ self.writeline(f"{target} = {param}")
+ elif action == VAR_LOAD_UNDEFINED:
+ undefs.append(target)
+ else:
+ raise NotImplementedError("unknown load instruction")
+ if undefs:
+ self.writeline(f"{' = '.join(undefs)} = missing")
+
+ def leave_frame(self, frame: Frame, with_python_scope: bool = False) -> None:
+ if not with_python_scope:
+ undefs = []
+ for target in frame.symbols.loads:
+ undefs.append(target)
+ if undefs:
+ self.writeline(f"{' = '.join(undefs)} = missing")
+
+ def choose_async(self, async_value: str = "async ", sync_value: str = "") -> str:
+ return async_value if self.environment.is_async else sync_value
+
+ def func(self, name: str) -> str:
+ return f"{self.choose_async()}def {name}"
+
+ def macro_body(
+ self, node: t.Union[nodes.Macro, nodes.CallBlock], frame: Frame
+ ) -> t.Tuple[Frame, MacroRef]:
+ """Dump the function def of a macro or call block."""
+ frame = frame.inner()
+ frame.symbols.analyze_node(node)
+ macro_ref = MacroRef(node)
+
+ explicit_caller = None
+ skip_special_params = set()
+ args = []
+
+ for idx, arg in enumerate(node.args):
+ if arg.name == "caller":
+ explicit_caller = idx
+ if arg.name in ("kwargs", "varargs"):
+ skip_special_params.add(arg.name)
+ args.append(frame.symbols.ref(arg.name))
+
+ undeclared = find_undeclared(node.body, ("caller", "kwargs", "varargs"))
+
+ if "caller" in undeclared:
+ # In older Jinja versions there was a bug that allowed caller
+ # to retain the special behavior even if it was mentioned in
+ # the argument list. However thankfully this was only really
+ # working if it was the last argument. So we are explicitly
+ # checking this now and error out if it is anywhere else in
+ # the argument list.
+ if explicit_caller is not None:
+ try:
+ node.defaults[explicit_caller - len(node.args)]
+ except IndexError:
+ self.fail(
+ "When defining macros or call blocks the "
+ 'special "caller" argument must be omitted '
+ "or be given a default.",
+ node.lineno,
+ )
+ else:
+ args.append(frame.symbols.declare_parameter("caller"))
+ macro_ref.accesses_caller = True
+ if "kwargs" in undeclared and "kwargs" not in skip_special_params:
+ args.append(frame.symbols.declare_parameter("kwargs"))
+ macro_ref.accesses_kwargs = True
+ if "varargs" in undeclared and "varargs" not in skip_special_params:
+ args.append(frame.symbols.declare_parameter("varargs"))
+ macro_ref.accesses_varargs = True
+
+ # macros are delayed, they never require output checks
+ frame.require_output_check = False
+ frame.symbols.analyze_node(node)
+ self.writeline(f"{self.func('macro')}({', '.join(args)}):", node)
+ self.indent()
+
+ self.buffer(frame)
+ self.enter_frame(frame)
+
+ self.push_parameter_definitions(frame)
+ for idx, arg in enumerate(node.args):
+ ref = frame.symbols.ref(arg.name)
+ self.writeline(f"if {ref} is missing:")
+ self.indent()
+ try:
+ default = node.defaults[idx - len(node.args)]
+ except IndexError:
+ self.writeline(
+ f'{ref} = undefined("parameter {arg.name!r} was not provided",'
+ f" name={arg.name!r})"
+ )
+ else:
+ self.writeline(f"{ref} = ")
+ self.visit(default, frame)
+ self.mark_parameter_stored(ref)
+ self.outdent()
+ self.pop_parameter_definitions()
+
+ self.blockvisit(node.body, frame)
+ self.return_buffer_contents(frame, force_unescaped=True)
+ self.leave_frame(frame, with_python_scope=True)
+ self.outdent()
+
+ return frame, macro_ref
+
+ def macro_def(self, macro_ref: MacroRef, frame: Frame) -> None:
+ """Dump the macro definition for the def created by macro_body."""
+ arg_tuple = ", ".join(repr(x.name) for x in macro_ref.node.args)
+ name = getattr(macro_ref.node, "name", None)
+ if len(macro_ref.node.args) == 1:
+ arg_tuple += ","
+ self.write(
+ f"Macro(environment, macro, {name!r}, ({arg_tuple}),"
+ f" {macro_ref.accesses_kwargs!r}, {macro_ref.accesses_varargs!r},"
+ f" {macro_ref.accesses_caller!r}, context.eval_ctx.autoescape)"
+ )
+
+ def position(self, node: nodes.Node) -> str:
+ """Return a human readable position for the node."""
+ rv = f"line {node.lineno}"
+ if self.name is not None:
+ rv = f"{rv} in {self.name!r}"
+ return rv
+
+ def dump_local_context(self, frame: Frame) -> str:
+ items_kv = ", ".join(
+ f"{name!r}: {target}"
+ for name, target in frame.symbols.dump_stores().items()
+ )
+ return f"{{{items_kv}}}"
+
+ def write_commons(self) -> None:
+ """Writes a common preamble that is used by root and block functions.
+ Primarily this sets up common local helpers and enforces a generator
+ through a dead branch.
+ """
+ self.writeline("resolve = context.resolve_or_missing")
+ self.writeline("undefined = environment.undefined")
+ self.writeline("concat = environment.concat")
+ # always use the standard Undefined class for the implicit else of
+ # conditional expressions
+ self.writeline("cond_expr_undefined = Undefined")
+ self.writeline("if 0: yield None")
+
+ def push_parameter_definitions(self, frame: Frame) -> None:
+ """Pushes all parameter targets from the given frame into a local
+ stack that permits tracking of yet to be assigned parameters. In
+ particular this enables the optimization from `visit_Name` to skip
+ undefined expressions for parameters in macros as macros can reference
+ otherwise unbound parameters.
+ """
+ self._param_def_block.append(frame.symbols.dump_param_targets())
+
+ def pop_parameter_definitions(self) -> None:
+ """Pops the current parameter definitions set."""
+ self._param_def_block.pop()
+
+ def mark_parameter_stored(self, target: str) -> None:
+ """Marks a parameter in the current parameter definitions as stored.
+ This will skip the enforced undefined checks.
+ """
+ if self._param_def_block:
+ self._param_def_block[-1].discard(target)
+
+ def push_context_reference(self, target: str) -> None:
+ self._context_reference_stack.append(target)
+
+ def pop_context_reference(self) -> None:
+ self._context_reference_stack.pop()
+
+ def get_context_ref(self) -> str:
+ return self._context_reference_stack[-1]
+
+ def get_resolve_func(self) -> str:
+ target = self._context_reference_stack[-1]
+ if target == "context":
+ return "resolve"
+ return f"{target}.resolve"
+
+ def derive_context(self, frame: Frame) -> str:
+ return f"{self.get_context_ref()}.derived({self.dump_local_context(frame)})"
+
+ def parameter_is_undeclared(self, target: str) -> bool:
+ """Checks if a given target is an undeclared parameter."""
+ if not self._param_def_block:
+ return False
+ return target in self._param_def_block[-1]
+
+ def push_assign_tracking(self) -> None:
+ """Pushes a new layer for assignment tracking."""
+ self._assign_stack.append(set())
+
+ def pop_assign_tracking(self, frame: Frame) -> None:
+ """Pops the topmost level for assignment tracking and updates the
+ context variables if necessary.
+ """
+ vars = self._assign_stack.pop()
+ if (
+ not frame.block_frame
+ and not frame.loop_frame
+ and not frame.toplevel
+ or not vars
+ ):
+ return
+ public_names = [x for x in vars if x[:1] != "_"]
+ if len(vars) == 1:
+ name = next(iter(vars))
+ ref = frame.symbols.ref(name)
+ if frame.loop_frame:
+ self.writeline(f"_loop_vars[{name!r}] = {ref}")
+ return
+ if frame.block_frame:
+ self.writeline(f"_block_vars[{name!r}] = {ref}")
+ return
+ self.writeline(f"context.vars[{name!r}] = {ref}")
+ else:
+ if frame.loop_frame:
+ self.writeline("_loop_vars.update({")
+ elif frame.block_frame:
+ self.writeline("_block_vars.update({")
+ else:
+ self.writeline("context.vars.update({")
+ for idx, name in enumerate(vars):
+ if idx:
+ self.write(", ")
+ ref = frame.symbols.ref(name)
+ self.write(f"{name!r}: {ref}")
+ self.write("})")
+ if not frame.block_frame and not frame.loop_frame and public_names:
+ if len(public_names) == 1:
+ self.writeline(f"context.exported_vars.add({public_names[0]!r})")
+ else:
+ names_str = ", ".join(map(repr, public_names))
+ self.writeline(f"context.exported_vars.update(({names_str}))")
+
+ # -- Statement Visitors
+
+ def visit_Template(
+ self, node: nodes.Template, frame: t.Optional[Frame] = None
+ ) -> None:
+ assert frame is None, "no root frame allowed"
+ eval_ctx = EvalContext(self.environment, self.name)
+
+ from .runtime import exported, async_exported
+
+ if self.environment.is_async:
+ exported_names = sorted(exported + async_exported)
+ else:
+ exported_names = sorted(exported)
+
+ self.writeline("from jinja2.runtime import " + ", ".join(exported_names))
+
+ # if we want a deferred initialization we cannot move the
+ # environment into a local name
+ envenv = "" if self.defer_init else ", environment=environment"
+
+ # do we have an extends tag at all? If not, we can save some
+ # overhead by just not processing any inheritance code.
+ have_extends = node.find(nodes.Extends) is not None
+
+ # find all blocks
+ for block in node.find_all(nodes.Block):
+ if block.name in self.blocks:
+ self.fail(f"block {block.name!r} defined twice", block.lineno)
+ self.blocks[block.name] = block
+
+ # find all imports and import them
+ for import_ in node.find_all(nodes.ImportedName):
+ if import_.importname not in self.import_aliases:
+ imp = import_.importname
+ self.import_aliases[imp] = alias = self.temporary_identifier()
+ if "." in imp:
+ module, obj = imp.rsplit(".", 1)
+ self.writeline(f"from {module} import {obj} as {alias}")
+ else:
+ self.writeline(f"import {imp} as {alias}")
+
+ # add the load name
+ self.writeline(f"name = {self.name!r}")
+
+ # generate the root render function.
+ self.writeline(
+ f"{self.func('root')}(context, missing=missing{envenv}):", extra=1
+ )
+ self.indent()
+ self.write_commons()
+
+ # process the root
+ frame = Frame(eval_ctx)
+ if "self" in find_undeclared(node.body, ("self",)):
+ ref = frame.symbols.declare_parameter("self")
+ self.writeline(f"{ref} = TemplateReference(context)")
+ frame.symbols.analyze_node(node)
+ frame.toplevel = frame.rootlevel = True
+ frame.require_output_check = have_extends and not self.has_known_extends
+ if have_extends:
+ self.writeline("parent_template = None")
+ self.enter_frame(frame)
+ self.pull_dependencies(node.body)
+ self.blockvisit(node.body, frame)
+ self.leave_frame(frame, with_python_scope=True)
+ self.outdent()
+
+ # make sure that the parent root is called.
+ if have_extends:
+ if not self.has_known_extends:
+ self.indent()
+ self.writeline("if parent_template is not None:")
+ self.indent()
+ if not self.environment.is_async:
+ self.writeline("yield from parent_template.root_render_func(context)")
+ else:
+ self.writeline(
+ "async for event in parent_template.root_render_func(context):"
+ )
+ self.indent()
+ self.writeline("yield event")
+ self.outdent()
+ self.outdent(1 + (not self.has_known_extends))
+
+ # at this point we now have the blocks collected and can visit them too.
+ for name, block in self.blocks.items():
+ self.writeline(
+ f"{self.func('block_' + name)}(context, missing=missing{envenv}):",
+ block,
+ 1,
+ )
+ self.indent()
+ self.write_commons()
+ # It's important that we do not make this frame a child of the
+ # toplevel template. This would cause a variety of
+ # interesting issues with identifier tracking.
+ block_frame = Frame(eval_ctx)
+ block_frame.block_frame = True
+ undeclared = find_undeclared(block.body, ("self", "super"))
+ if "self" in undeclared:
+ ref = block_frame.symbols.declare_parameter("self")
+ self.writeline(f"{ref} = TemplateReference(context)")
+ if "super" in undeclared:
+ ref = block_frame.symbols.declare_parameter("super")
+ self.writeline(f"{ref} = context.super({name!r}, block_{name})")
+ block_frame.symbols.analyze_node(block)
+ block_frame.block = name
+ self.writeline("_block_vars = {}")
+ self.enter_frame(block_frame)
+ self.pull_dependencies(block.body)
+ self.blockvisit(block.body, block_frame)
+ self.leave_frame(block_frame, with_python_scope=True)
+ self.outdent()
+
+ blocks_kv_str = ", ".join(f"{x!r}: block_{x}" for x in self.blocks)
+ self.writeline(f"blocks = {{{blocks_kv_str}}}", extra=1)
+ debug_kv_str = "&".join(f"{k}={v}" for k, v in self.debug_info)
+ self.writeline(f"debug_info = {debug_kv_str!r}")
+
+ def visit_Block(self, node: nodes.Block, frame: Frame) -> None:
+ """Call a block and register it for the template."""
+ level = 0
+ if frame.toplevel:
+ # if we know that we are a child template, there is no need to
+ # check if we are one
+ if self.has_known_extends:
+ return
+ if self.extends_so_far > 0:
+ self.writeline("if parent_template is None:")
+ self.indent()
+ level += 1
+
+ if node.scoped:
+ context = self.derive_context(frame)
+ else:
+ context = self.get_context_ref()
+
+ if node.required:
+ self.writeline(f"if len(context.blocks[{node.name!r}]) <= 1:", node)
+ self.indent()
+ self.writeline(
+ f'raise TemplateRuntimeError("Required block {node.name!r} not found")',
+ node,
+ )
+ self.outdent()
+
+ if not self.environment.is_async and frame.buffer is None:
+ self.writeline(
+ f"yield from context.blocks[{node.name!r}][0]({context})", node
+ )
+ else:
+ self.writeline(
+ f"{self.choose_async()}for event in"
+ f" context.blocks[{node.name!r}][0]({context}):",
+ node,
+ )
+ self.indent()
+ self.simple_write("event", frame)
+ self.outdent()
+
+ self.outdent(level)
+
+ def visit_Extends(self, node: nodes.Extends, frame: Frame) -> None:
+ """Calls the extender."""
+ if not frame.toplevel:
+ self.fail("cannot use extend from a non top-level scope", node.lineno)
+
+ # if the number of extends statements in general is zero so
+ # far, we don't have to add a check if something extended
+ # the template before this one.
+ if self.extends_so_far > 0:
+
+ # if we have a known extends we just add a template runtime
+ # error into the generated code. We could catch that at compile
+ # time too, but i welcome it not to confuse users by throwing the
+ # same error at different times just "because we can".
+ if not self.has_known_extends:
+ self.writeline("if parent_template is not None:")
+ self.indent()
+ self.writeline('raise TemplateRuntimeError("extended multiple times")')
+
+ # if we have a known extends already we don't need that code here
+ # as we know that the template execution will end here.
+ if self.has_known_extends:
+ raise CompilerExit()
+ else:
+ self.outdent()
+
+ self.writeline("parent_template = environment.get_template(", node)
+ self.visit(node.template, frame)
+ self.write(f", {self.name!r})")
+ self.writeline("for name, parent_block in parent_template.blocks.items():")
+ self.indent()
+ self.writeline("context.blocks.setdefault(name, []).append(parent_block)")
+ self.outdent()
+
+ # if this extends statement was in the root level we can take
+ # advantage of that information and simplify the generated code
+ # in the top level from this point onwards
+ if frame.rootlevel:
+ self.has_known_extends = True
+
+ # and now we have one more
+ self.extends_so_far += 1
+
+ def visit_Include(self, node: nodes.Include, frame: Frame) -> None:
+ """Handles includes."""
+ if node.ignore_missing:
+ self.writeline("try:")
+ self.indent()
+
+ func_name = "get_or_select_template"
+ if isinstance(node.template, nodes.Const):
+ if isinstance(node.template.value, str):
+ func_name = "get_template"
+ elif isinstance(node.template.value, (tuple, list)):
+ func_name = "select_template"
+ elif isinstance(node.template, (nodes.Tuple, nodes.List)):
+ func_name = "select_template"
+
+ self.writeline(f"template = environment.{func_name}(", node)
+ self.visit(node.template, frame)
+ self.write(f", {self.name!r})")
+ if node.ignore_missing:
+ self.outdent()
+ self.writeline("except TemplateNotFound:")
+ self.indent()
+ self.writeline("pass")
+ self.outdent()
+ self.writeline("else:")
+ self.indent()
+
+ skip_event_yield = False
+ if node.with_context:
+ self.writeline(
+ f"{self.choose_async()}for event in template.root_render_func("
+ "template.new_context(context.get_all(), True,"
+ f" {self.dump_local_context(frame)})):"
+ )
+ elif self.environment.is_async:
+ self.writeline(
+ "for event in (await template._get_default_module_async())"
+ "._body_stream:"
+ )
+ else:
+ self.writeline("yield from template._get_default_module()._body_stream")
+ skip_event_yield = True
+
+ if not skip_event_yield:
+ self.indent()
+ self.simple_write("event", frame)
+ self.outdent()
+
+ if node.ignore_missing:
+ self.outdent()
+
+ def _import_common(
+ self, node: t.Union[nodes.Import, nodes.FromImport], frame: Frame
+ ) -> None:
+ self.write(f"{self.choose_async('await ')}environment.get_template(")
+ self.visit(node.template, frame)
+ self.write(f", {self.name!r}).")
+
+ if node.with_context:
+ f_name = f"make_module{self.choose_async('_async')}"
+ self.write(
+ f"{f_name}(context.get_all(), True, {self.dump_local_context(frame)})"
+ )
+ else:
+ self.write(f"_get_default_module{self.choose_async('_async')}(context)")
+
+ def visit_Import(self, node: nodes.Import, frame: Frame) -> None:
+ """Visit regular imports."""
+ self.writeline(f"{frame.symbols.ref(node.target)} = ", node)
+ if frame.toplevel:
+ self.write(f"context.vars[{node.target!r}] = ")
+
+ self._import_common(node, frame)
+
+ if frame.toplevel and not node.target.startswith("_"):
+ self.writeline(f"context.exported_vars.discard({node.target!r})")
+
+ def visit_FromImport(self, node: nodes.FromImport, frame: Frame) -> None:
+ """Visit named imports."""
+ self.newline(node)
+ self.write("included_template = ")
+ self._import_common(node, frame)
+ var_names = []
+ discarded_names = []
+ for name in node.names:
+ if isinstance(name, tuple):
+ name, alias = name
+ else:
+ alias = name
+ self.writeline(
+ f"{frame.symbols.ref(alias)} ="
+ f" getattr(included_template, {name!r}, missing)"
+ )
+ self.writeline(f"if {frame.symbols.ref(alias)} is missing:")
+ self.indent()
+ message = (
+ "the template {included_template.__name__!r}"
+ f" (imported on {self.position(node)})"
+ f" does not export the requested name {name!r}"
+ )
+ self.writeline(
+ f"{frame.symbols.ref(alias)} = undefined(f{message!r}, name={name!r})"
+ )
+ self.outdent()
+ if frame.toplevel:
+ var_names.append(alias)
+ if not alias.startswith("_"):
+ discarded_names.append(alias)
+
+ if var_names:
+ if len(var_names) == 1:
+ name = var_names[0]
+ self.writeline(f"context.vars[{name!r}] = {frame.symbols.ref(name)}")
+ else:
+ names_kv = ", ".join(
+ f"{name!r}: {frame.symbols.ref(name)}" for name in var_names
+ )
+ self.writeline(f"context.vars.update({{{names_kv}}})")
+ if discarded_names:
+ if len(discarded_names) == 1:
+ self.writeline(f"context.exported_vars.discard({discarded_names[0]!r})")
+ else:
+ names_str = ", ".join(map(repr, discarded_names))
+ self.writeline(
+ f"context.exported_vars.difference_update(({names_str}))"
+ )
+
+ def visit_For(self, node: nodes.For, frame: Frame) -> None:
+ loop_frame = frame.inner()
+ loop_frame.loop_frame = True
+ test_frame = frame.inner()
+ else_frame = frame.inner()
+
+ # try to figure out if we have an extended loop. An extended loop
+ # is necessary if the loop is in recursive mode if the special loop
+ # variable is accessed in the body if the body is a scoped block.
+ extended_loop = (
+ node.recursive
+ or "loop"
+ in find_undeclared(node.iter_child_nodes(only=("body",)), ("loop",))
+ or any(block.scoped for block in node.find_all(nodes.Block))
+ )
+
+ loop_ref = None
+ if extended_loop:
+ loop_ref = loop_frame.symbols.declare_parameter("loop")
+
+ loop_frame.symbols.analyze_node(node, for_branch="body")
+ if node.else_:
+ else_frame.symbols.analyze_node(node, for_branch="else")
+
+ if node.test:
+ loop_filter_func = self.temporary_identifier()
+ test_frame.symbols.analyze_node(node, for_branch="test")
+ self.writeline(f"{self.func(loop_filter_func)}(fiter):", node.test)
+ self.indent()
+ self.enter_frame(test_frame)
+ self.writeline(self.choose_async("async for ", "for "))
+ self.visit(node.target, loop_frame)
+ self.write(" in ")
+ self.write(self.choose_async("auto_aiter(fiter)", "fiter"))
+ self.write(":")
+ self.indent()
+ self.writeline("if ", node.test)
+ self.visit(node.test, test_frame)
+ self.write(":")
+ self.indent()
+ self.writeline("yield ")
+ self.visit(node.target, loop_frame)
+ self.outdent(3)
+ self.leave_frame(test_frame, with_python_scope=True)
+
+ # if we don't have an recursive loop we have to find the shadowed
+ # variables at that point. Because loops can be nested but the loop
+ # variable is a special one we have to enforce aliasing for it.
+ if node.recursive:
+ self.writeline(
+ f"{self.func('loop')}(reciter, loop_render_func, depth=0):", node
+ )
+ self.indent()
+ self.buffer(loop_frame)
+
+ # Use the same buffer for the else frame
+ else_frame.buffer = loop_frame.buffer
+
+ # make sure the loop variable is a special one and raise a template
+ # assertion error if a loop tries to write to loop
+ if extended_loop:
+ self.writeline(f"{loop_ref} = missing")
+
+ for name in node.find_all(nodes.Name):
+ if name.ctx == "store" and name.name == "loop":
+ self.fail(
+ "Can't assign to special loop variable in for-loop target",
+ name.lineno,
+ )
+
+ if node.else_:
+ iteration_indicator = self.temporary_identifier()
+ self.writeline(f"{iteration_indicator} = 1")
+
+ self.writeline(self.choose_async("async for ", "for "), node)
+ self.visit(node.target, loop_frame)
+ if extended_loop:
+ self.write(f", {loop_ref} in {self.choose_async('Async')}LoopContext(")
+ else:
+ self.write(" in ")
+
+ if node.test:
+ self.write(f"{loop_filter_func}(")
+ if node.recursive:
+ self.write("reciter")
+ else:
+ if self.environment.is_async and not extended_loop:
+ self.write("auto_aiter(")
+ self.visit(node.iter, frame)
+ if self.environment.is_async and not extended_loop:
+ self.write(")")
+ if node.test:
+ self.write(")")
+
+ if node.recursive:
+ self.write(", undefined, loop_render_func, depth):")
+ else:
+ self.write(", undefined):" if extended_loop else ":")
+
+ self.indent()
+ self.enter_frame(loop_frame)
+
+ self.writeline("_loop_vars = {}")
+ self.blockvisit(node.body, loop_frame)
+ if node.else_:
+ self.writeline(f"{iteration_indicator} = 0")
+ self.outdent()
+ self.leave_frame(
+ loop_frame, with_python_scope=node.recursive and not node.else_
+ )
+
+ if node.else_:
+ self.writeline(f"if {iteration_indicator}:")
+ self.indent()
+ self.enter_frame(else_frame)
+ self.blockvisit(node.else_, else_frame)
+ self.leave_frame(else_frame)
+ self.outdent()
+
+ # if the node was recursive we have to return the buffer contents
+ # and start the iteration code
+ if node.recursive:
+ self.return_buffer_contents(loop_frame)
+ self.outdent()
+ self.start_write(frame, node)
+ self.write(f"{self.choose_async('await ')}loop(")
+ if self.environment.is_async:
+ self.write("auto_aiter(")
+ self.visit(node.iter, frame)
+ if self.environment.is_async:
+ self.write(")")
+ self.write(", loop)")
+ self.end_write(frame)
+
+ # at the end of the iteration, clear any assignments made in the
+ # loop from the top level
+ if self._assign_stack:
+ self._assign_stack[-1].difference_update(loop_frame.symbols.stores)
+
+ def visit_If(self, node: nodes.If, frame: Frame) -> None:
+ if_frame = frame.soft()
+ self.writeline("if ", node)
+ self.visit(node.test, if_frame)
+ self.write(":")
+ self.indent()
+ self.blockvisit(node.body, if_frame)
+ self.outdent()
+ for elif_ in node.elif_:
+ self.writeline("elif ", elif_)
+ self.visit(elif_.test, if_frame)
+ self.write(":")
+ self.indent()
+ self.blockvisit(elif_.body, if_frame)
+ self.outdent()
+ if node.else_:
+ self.writeline("else:")
+ self.indent()
+ self.blockvisit(node.else_, if_frame)
+ self.outdent()
+
+ def visit_Macro(self, node: nodes.Macro, frame: Frame) -> None:
+ macro_frame, macro_ref = self.macro_body(node, frame)
+ self.newline()
+ if frame.toplevel:
+ if not node.name.startswith("_"):
+ self.write(f"context.exported_vars.add({node.name!r})")
+ self.writeline(f"context.vars[{node.name!r}] = ")
+ self.write(f"{frame.symbols.ref(node.name)} = ")
+ self.macro_def(macro_ref, macro_frame)
+
+ def visit_CallBlock(self, node: nodes.CallBlock, frame: Frame) -> None:
+ call_frame, macro_ref = self.macro_body(node, frame)
+ self.writeline("caller = ")
+ self.macro_def(macro_ref, call_frame)
+ self.start_write(frame, node)
+ self.visit_Call(node.call, frame, forward_caller=True)
+ self.end_write(frame)
+
+ def visit_FilterBlock(self, node: nodes.FilterBlock, frame: Frame) -> None:
+ filter_frame = frame.inner()
+ filter_frame.symbols.analyze_node(node)
+ self.enter_frame(filter_frame)
+ self.buffer(filter_frame)
+ self.blockvisit(node.body, filter_frame)
+ self.start_write(frame, node)
+ self.visit_Filter(node.filter, filter_frame)
+ self.end_write(frame)
+ self.leave_frame(filter_frame)
+
+ def visit_With(self, node: nodes.With, frame: Frame) -> None:
+ with_frame = frame.inner()
+ with_frame.symbols.analyze_node(node)
+ self.enter_frame(with_frame)
+ for target, expr in zip(node.targets, node.values):
+ self.newline()
+ self.visit(target, with_frame)
+ self.write(" = ")
+ self.visit(expr, frame)
+ self.blockvisit(node.body, with_frame)
+ self.leave_frame(with_frame)
+
+ def visit_ExprStmt(self, node: nodes.ExprStmt, frame: Frame) -> None:
+ self.newline(node)
+ self.visit(node.node, frame)
+
+ class _FinalizeInfo(t.NamedTuple):
+ const: t.Optional[t.Callable[..., str]]
+ src: t.Optional[str]
+
+ @staticmethod
+ def _default_finalize(value: t.Any) -> t.Any:
+ """The default finalize function if the environment isn't
+ configured with one. Or, if the environment has one, this is
+ called on that function's output for constants.
+ """
+ return str(value)
+
+ _finalize: t.Optional[_FinalizeInfo] = None
+
+ def _make_finalize(self) -> _FinalizeInfo:
+ """Build the finalize function to be used on constants and at
+ runtime. Cached so it's only created once for all output nodes.
+
+ Returns a ``namedtuple`` with the following attributes:
+
+ ``const``
+ A function to finalize constant data at compile time.
+
+ ``src``
+ Source code to output around nodes to be evaluated at
+ runtime.
+ """
+ if self._finalize is not None:
+ return self._finalize
+
+ finalize: t.Optional[t.Callable[..., t.Any]]
+ finalize = default = self._default_finalize
+ src = None
+
+ if self.environment.finalize:
+ src = "environment.finalize("
+ env_finalize = self.environment.finalize
+ pass_arg = {
+ _PassArg.context: "context",
+ _PassArg.eval_context: "context.eval_ctx",
+ _PassArg.environment: "environment",
+ }.get(
+ _PassArg.from_obj(env_finalize) # type: ignore
+ )
+ finalize = None
+
+ if pass_arg is None:
+
+ def finalize(value: t.Any) -> t.Any:
+ return default(env_finalize(value))
+
+ else:
+ src = f"{src}{pass_arg}, "
+
+ if pass_arg == "environment":
+
+ def finalize(value: t.Any) -> t.Any:
+ return default(env_finalize(self.environment, value))
+
+ self._finalize = self._FinalizeInfo(finalize, src)
+ return self._finalize
+
+ def _output_const_repr(self, group: t.Iterable[t.Any]) -> str:
+ """Given a group of constant values converted from ``Output``
+ child nodes, produce a string to write to the template module
+ source.
+ """
+ return repr(concat(group))
+
+ def _output_child_to_const(
+ self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+ ) -> str:
+ """Try to optimize a child of an ``Output`` node by trying to
+ convert it to constant, finalized data at compile time.
+
+ If :exc:`Impossible` is raised, the node is not constant and
+ will be evaluated at runtime. Any other exception will also be
+ evaluated at runtime for easier debugging.
+ """
+ const = node.as_const(frame.eval_ctx)
+
+ if frame.eval_ctx.autoescape:
+ const = escape(const)
+
+ # Template data doesn't go through finalize.
+ if isinstance(node, nodes.TemplateData):
+ return str(const)
+
+ return finalize.const(const) # type: ignore
+
+ def _output_child_pre(
+ self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+ ) -> None:
+ """Output extra source code before visiting a child of an
+ ``Output`` node.
+ """
+ if frame.eval_ctx.volatile:
+ self.write("(escape if context.eval_ctx.autoescape else str)(")
+ elif frame.eval_ctx.autoescape:
+ self.write("escape(")
+ else:
+ self.write("str(")
+
+ if finalize.src is not None:
+ self.write(finalize.src)
+
+ def _output_child_post(
+ self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+ ) -> None:
+ """Output extra source code after visiting a child of an
+ ``Output`` node.
+ """
+ self.write(")")
+
+ if finalize.src is not None:
+ self.write(")")
+
+ def visit_Output(self, node: nodes.Output, frame: Frame) -> None:
+ # If an extends is active, don't render outside a block.
+ if frame.require_output_check:
+ # A top-level extends is known to exist at compile time.
+ if self.has_known_extends:
+ return
+
+ self.writeline("if parent_template is None:")
+ self.indent()
+
+ finalize = self._make_finalize()
+ body: t.List[t.Union[t.List[t.Any], nodes.Expr]] = []
+
+ # Evaluate constants at compile time if possible. Each item in
+ # body will be either a list of static data or a node to be
+ # evaluated at runtime.
+ for child in node.nodes:
+ try:
+ if not (
+ # If the finalize function requires runtime context,
+ # constants can't be evaluated at compile time.
+ finalize.const
+ # Unless it's basic template data that won't be
+ # finalized anyway.
+ or isinstance(child, nodes.TemplateData)
+ ):
+ raise nodes.Impossible()
+
+ const = self._output_child_to_const(child, frame, finalize)
+ except (nodes.Impossible, Exception):
+ # The node was not constant and needs to be evaluated at
+ # runtime. Or another error was raised, which is easier
+ # to debug at runtime.
+ body.append(child)
+ continue
+
+ if body and isinstance(body[-1], list):
+ body[-1].append(const)
+ else:
+ body.append([const])
+
+ if frame.buffer is not None:
+ if len(body) == 1:
+ self.writeline(f"{frame.buffer}.append(")
+ else:
+ self.writeline(f"{frame.buffer}.extend((")
+
+ self.indent()
+
+ for item in body:
+ if isinstance(item, list):
+ # A group of constant data to join and output.
+ val = self._output_const_repr(item)
+
+ if frame.buffer is None:
+ self.writeline("yield " + val)
+ else:
+ self.writeline(val + ",")
+ else:
+ if frame.buffer is None:
+ self.writeline("yield ", item)
+ else:
+ self.newline(item)
+
+ # A node to be evaluated at runtime.
+ self._output_child_pre(item, frame, finalize)
+ self.visit(item, frame)
+ self._output_child_post(item, frame, finalize)
+
+ if frame.buffer is not None:
+ self.write(",")
+
+ if frame.buffer is not None:
+ self.outdent()
+ self.writeline(")" if len(body) == 1 else "))")
+
+ if frame.require_output_check:
+ self.outdent()
+
+ def visit_Assign(self, node: nodes.Assign, frame: Frame) -> None:
+ self.push_assign_tracking()
+ self.newline(node)
+ self.visit(node.target, frame)
+ self.write(" = ")
+ self.visit(node.node, frame)
+ self.pop_assign_tracking(frame)
+
+ def visit_AssignBlock(self, node: nodes.AssignBlock, frame: Frame) -> None:
+ self.push_assign_tracking()
+ block_frame = frame.inner()
+ # This is a special case. Since a set block always captures we
+ # will disable output checks. This way one can use set blocks
+ # toplevel even in extended templates.
+ block_frame.require_output_check = False
+ block_frame.symbols.analyze_node(node)
+ self.enter_frame(block_frame)
+ self.buffer(block_frame)
+ self.blockvisit(node.body, block_frame)
+ self.newline(node)
+ self.visit(node.target, frame)
+ self.write(" = (Markup if context.eval_ctx.autoescape else identity)(")
+ if node.filter is not None:
+ self.visit_Filter(node.filter, block_frame)
+ else:
+ self.write(f"concat({block_frame.buffer})")
+ self.write(")")
+ self.pop_assign_tracking(frame)
+ self.leave_frame(block_frame)
+
+ # -- Expression Visitors
+
+ def visit_Name(self, node: nodes.Name, frame: Frame) -> None:
+ if node.ctx == "store" and (
+ frame.toplevel or frame.loop_frame or frame.block_frame
+ ):
+ if self._assign_stack:
+ self._assign_stack[-1].add(node.name)
+ ref = frame.symbols.ref(node.name)
+
+ # If we are looking up a variable we might have to deal with the
+ # case where it's undefined. We can skip that case if the load
+ # instruction indicates a parameter which are always defined.
+ if node.ctx == "load":
+ load = frame.symbols.find_load(ref)
+ if not (
+ load is not None
+ and load[0] == VAR_LOAD_PARAMETER
+ and not self.parameter_is_undeclared(ref)
+ ):
+ self.write(
+ f"(undefined(name={node.name!r}) if {ref} is missing else {ref})"
+ )
+ return
+
+ self.write(ref)
+
+ def visit_NSRef(self, node: nodes.NSRef, frame: Frame) -> None:
+ # NSRefs can only be used to store values; since they use the normal
+ # `foo.bar` notation they will be parsed as a normal attribute access
+ # when used anywhere but in a `set` context
+ ref = frame.symbols.ref(node.name)
+ self.writeline(f"if not isinstance({ref}, Namespace):")
+ self.indent()
+ self.writeline(
+ "raise TemplateRuntimeError"
+ '("cannot assign attribute on non-namespace object")'
+ )
+ self.outdent()
+ self.writeline(f"{ref}[{node.attr!r}]")
+
+ def visit_Const(self, node: nodes.Const, frame: Frame) -> None:
+ val = node.as_const(frame.eval_ctx)
+ if isinstance(val, float):
+ self.write(str(val))
+ else:
+ self.write(repr(val))
+
+ def visit_TemplateData(self, node: nodes.TemplateData, frame: Frame) -> None:
+ try:
+ self.write(repr(node.as_const(frame.eval_ctx)))
+ except nodes.Impossible:
+ self.write(
+ f"(Markup if context.eval_ctx.autoescape else identity)({node.data!r})"
+ )
+
+ def visit_Tuple(self, node: nodes.Tuple, frame: Frame) -> None:
+ self.write("(")
+ idx = -1
+ for idx, item in enumerate(node.items):
+ if idx:
+ self.write(", ")
+ self.visit(item, frame)
+ self.write(",)" if idx == 0 else ")")
+
+ def visit_List(self, node: nodes.List, frame: Frame) -> None:
+ self.write("[")
+ for idx, item in enumerate(node.items):
+ if idx:
+ self.write(", ")
+ self.visit(item, frame)
+ self.write("]")
+
+ def visit_Dict(self, node: nodes.Dict, frame: Frame) -> None:
+ self.write("{")
+ for idx, item in enumerate(node.items):
+ if idx:
+ self.write(", ")
+ self.visit(item.key, frame)
+ self.write(": ")
+ self.visit(item.value, frame)
+ self.write("}")
+
+ visit_Add = _make_binop("+")
+ visit_Sub = _make_binop("-")
+ visit_Mul = _make_binop("*")
+ visit_Div = _make_binop("/")
+ visit_FloorDiv = _make_binop("//")
+ visit_Pow = _make_binop("**")
+ visit_Mod = _make_binop("%")
+ visit_And = _make_binop("and")
+ visit_Or = _make_binop("or")
+ visit_Pos = _make_unop("+")
+ visit_Neg = _make_unop("-")
+ visit_Not = _make_unop("not ")
+
+ @optimizeconst
+ def visit_Concat(self, node: nodes.Concat, frame: Frame) -> None:
+ if frame.eval_ctx.volatile:
+ func_name = "(markup_join if context.eval_ctx.volatile else str_join)"
+ elif frame.eval_ctx.autoescape:
+ func_name = "markup_join"
+ else:
+ func_name = "str_join"
+ self.write(f"{func_name}((")
+ for arg in node.nodes:
+ self.visit(arg, frame)
+ self.write(", ")
+ self.write("))")
+
+ @optimizeconst
+ def visit_Compare(self, node: nodes.Compare, frame: Frame) -> None:
+ self.write("(")
+ self.visit(node.expr, frame)
+ for op in node.ops:
+ self.visit(op, frame)
+ self.write(")")
+
+ def visit_Operand(self, node: nodes.Operand, frame: Frame) -> None:
+ self.write(f" {operators[node.op]} ")
+ self.visit(node.expr, frame)
+
+ @optimizeconst
+ def visit_Getattr(self, node: nodes.Getattr, frame: Frame) -> None:
+ if self.environment.is_async:
+ self.write("(await auto_await(")
+
+ self.write("environment.getattr(")
+ self.visit(node.node, frame)
+ self.write(f", {node.attr!r})")
+
+ if self.environment.is_async:
+ self.write("))")
+
+ @optimizeconst
+ def visit_Getitem(self, node: nodes.Getitem, frame: Frame) -> None:
+ # slices bypass the environment getitem method.
+ if isinstance(node.arg, nodes.Slice):
+ self.visit(node.node, frame)
+ self.write("[")
+ self.visit(node.arg, frame)
+ self.write("]")
+ else:
+ if self.environment.is_async:
+ self.write("(await auto_await(")
+
+ self.write("environment.getitem(")
+ self.visit(node.node, frame)
+ self.write(", ")
+ self.visit(node.arg, frame)
+ self.write(")")
+
+ if self.environment.is_async:
+ self.write("))")
+
+ def visit_Slice(self, node: nodes.Slice, frame: Frame) -> None:
+ if node.start is not None:
+ self.visit(node.start, frame)
+ self.write(":")
+ if node.stop is not None:
+ self.visit(node.stop, frame)
+ if node.step is not None:
+ self.write(":")
+ self.visit(node.step, frame)
+
+ @contextmanager
+ def _filter_test_common(
+ self, node: t.Union[nodes.Filter, nodes.Test], frame: Frame, is_filter: bool
+ ) -> t.Iterator[None]:
+ if self.environment.is_async:
+ self.write("(await auto_await(")
+
+ if is_filter:
+ self.write(f"{self.filters[node.name]}(")
+ func = self.environment.filters.get(node.name)
+ else:
+ self.write(f"{self.tests[node.name]}(")
+ func = self.environment.tests.get(node.name)
+
+ # When inside an If or CondExpr frame, allow the filter to be
+ # undefined at compile time and only raise an error if it's
+ # actually called at runtime. See pull_dependencies.
+ if func is None and not frame.soft_frame:
+ type_name = "filter" if is_filter else "test"
+ self.fail(f"No {type_name} named {node.name!r}.", node.lineno)
+
+ pass_arg = {
+ _PassArg.context: "context",
+ _PassArg.eval_context: "context.eval_ctx",
+ _PassArg.environment: "environment",
+ }.get(
+ _PassArg.from_obj(func) # type: ignore
+ )
+
+ if pass_arg is not None:
+ self.write(f"{pass_arg}, ")
+
+ # Back to the visitor function to handle visiting the target of
+ # the filter or test.
+ yield
+
+ self.signature(node, frame)
+ self.write(")")
+
+ if self.environment.is_async:
+ self.write("))")
+
+ @optimizeconst
+ def visit_Filter(self, node: nodes.Filter, frame: Frame) -> None:
+ with self._filter_test_common(node, frame, True):
+ # if the filter node is None we are inside a filter block
+ # and want to write to the current buffer
+ if node.node is not None:
+ self.visit(node.node, frame)
+ elif frame.eval_ctx.volatile:
+ self.write(
+ f"(Markup(concat({frame.buffer}))"
+ f" if context.eval_ctx.autoescape else concat({frame.buffer}))"
+ )
+ elif frame.eval_ctx.autoescape:
+ self.write(f"Markup(concat({frame.buffer}))")
+ else:
+ self.write(f"concat({frame.buffer})")
+
+ @optimizeconst
+ def visit_Test(self, node: nodes.Test, frame: Frame) -> None:
+ with self._filter_test_common(node, frame, False):
+ self.visit(node.node, frame)
+
+ @optimizeconst
+ def visit_CondExpr(self, node: nodes.CondExpr, frame: Frame) -> None:
+ frame = frame.soft()
+
+ def write_expr2() -> None:
+ if node.expr2 is not None:
+ self.visit(node.expr2, frame)
+ return
+
+ self.write(
+ f'cond_expr_undefined("the inline if-expression on'
+ f" {self.position(node)} evaluated to false and no else"
+ f' section was defined.")'
+ )
+
+ self.write("(")
+ self.visit(node.expr1, frame)
+ self.write(" if ")
+ self.visit(node.test, frame)
+ self.write(" else ")
+ write_expr2()
+ self.write(")")
+
+ @optimizeconst
+ def visit_Call(
+ self, node: nodes.Call, frame: Frame, forward_caller: bool = False
+ ) -> None:
+ if self.environment.is_async:
+ self.write("(await auto_await(")
+ if self.environment.sandboxed:
+ self.write("environment.call(context, ")
+ else:
+ self.write("context.call(")
+ self.visit(node.node, frame)
+ extra_kwargs = {"caller": "caller"} if forward_caller else None
+ loop_kwargs = {"_loop_vars": "_loop_vars"} if frame.loop_frame else {}
+ block_kwargs = {"_block_vars": "_block_vars"} if frame.block_frame else {}
+ if extra_kwargs:
+ extra_kwargs.update(loop_kwargs, **block_kwargs)
+ elif loop_kwargs or block_kwargs:
+ extra_kwargs = dict(loop_kwargs, **block_kwargs)
+ self.signature(node, frame, extra_kwargs)
+ self.write(")")
+ if self.environment.is_async:
+ self.write("))")
+
+ def visit_Keyword(self, node: nodes.Keyword, frame: Frame) -> None:
+ self.write(node.key + "=")
+ self.visit(node.value, frame)
+
+ # -- Unused nodes for extensions
+
+ def visit_MarkSafe(self, node: nodes.MarkSafe, frame: Frame) -> None:
+ self.write("Markup(")
+ self.visit(node.expr, frame)
+ self.write(")")
+
+ def visit_MarkSafeIfAutoescape(
+ self, node: nodes.MarkSafeIfAutoescape, frame: Frame
+ ) -> None:
+ self.write("(Markup if context.eval_ctx.autoescape else identity)(")
+ self.visit(node.expr, frame)
+ self.write(")")
+
+ def visit_EnvironmentAttribute(
+ self, node: nodes.EnvironmentAttribute, frame: Frame
+ ) -> None:
+ self.write("environment." + node.name)
+
+ def visit_ExtensionAttribute(
+ self, node: nodes.ExtensionAttribute, frame: Frame
+ ) -> None:
+ self.write(f"environment.extensions[{node.identifier!r}].{node.name}")
+
+ def visit_ImportedName(self, node: nodes.ImportedName, frame: Frame) -> None:
+ self.write(self.import_aliases[node.importname])
+
+ def visit_InternalName(self, node: nodes.InternalName, frame: Frame) -> None:
+ self.write(node.name)
+
+ def visit_ContextReference(
+ self, node: nodes.ContextReference, frame: Frame
+ ) -> None:
+ self.write("context")
+
+ def visit_DerivedContextReference(
+ self, node: nodes.DerivedContextReference, frame: Frame
+ ) -> None:
+ self.write(self.derive_context(frame))
+
+ def visit_Continue(self, node: nodes.Continue, frame: Frame) -> None:
+ self.writeline("continue", node)
+
+ def visit_Break(self, node: nodes.Break, frame: Frame) -> None:
+ self.writeline("break", node)
+
+ def visit_Scope(self, node: nodes.Scope, frame: Frame) -> None:
+ scope_frame = frame.inner()
+ scope_frame.symbols.analyze_node(node)
+ self.enter_frame(scope_frame)
+ self.blockvisit(node.body, scope_frame)
+ self.leave_frame(scope_frame)
+
+ def visit_OverlayScope(self, node: nodes.OverlayScope, frame: Frame) -> None:
+ ctx = self.temporary_identifier()
+ self.writeline(f"{ctx} = {self.derive_context(frame)}")
+ self.writeline(f"{ctx}.vars = ")
+ self.visit(node.context, frame)
+ self.push_context_reference(ctx)
+
+ scope_frame = frame.inner(isolated=True)
+ scope_frame.symbols.analyze_node(node)
+ self.enter_frame(scope_frame)
+ self.blockvisit(node.body, scope_frame)
+ self.leave_frame(scope_frame)
+ self.pop_context_reference()
+
+ def visit_EvalContextModifier(
+ self, node: nodes.EvalContextModifier, frame: Frame
+ ) -> None:
+ for keyword in node.options:
+ self.writeline(f"context.eval_ctx.{keyword.key} = ")
+ self.visit(keyword.value, frame)
+ try:
+ val = keyword.value.as_const(frame.eval_ctx)
+ except nodes.Impossible:
+ frame.eval_ctx.volatile = True
+ else:
+ setattr(frame.eval_ctx, keyword.key, val)
+
+ def visit_ScopedEvalContextModifier(
+ self, node: nodes.ScopedEvalContextModifier, frame: Frame
+ ) -> None:
+ old_ctx_name = self.temporary_identifier()
+ saved_ctx = frame.eval_ctx.save()
+ self.writeline(f"{old_ctx_name} = context.eval_ctx.save()")
+ self.visit_EvalContextModifier(node, frame)
+ for child in node.body:
+ self.visit(child, frame)
+ frame.eval_ctx.revert(saved_ctx)
+ self.writeline(f"context.eval_ctx.revert({old_ctx_name})")
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-14 01:18:05 +0000