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authorcyfraeviolae <cyfraeviolae>2024-04-03 03:17:55 -0400
committercyfraeviolae <cyfraeviolae>2024-04-03 03:17:55 -0400
commit12cf076118570eebbff08c6b3090e0d4798447a1 (patch)
tree3ba25e17e3c3a5e82316558ba3864b955919ff72 /venv/lib/python3.11/site-packages/jinja2/compiler.py
parentc45662ff3923b34614ddcc8feb9195541166dcc5 (diff)
no venv
Diffstat (limited to 'venv/lib/python3.11/site-packages/jinja2/compiler.py')
-rw-r--r--venv/lib/python3.11/site-packages/jinja2/compiler.py1956
1 files changed, 0 insertions, 1956 deletions
diff --git a/venv/lib/python3.11/site-packages/jinja2/compiler.py b/venv/lib/python3.11/site-packages/jinja2/compiler.py
deleted file mode 100644
index ff95c80..0000000
--- a/venv/lib/python3.11/site-packages/jinja2/compiler.py
+++ /dev/null
@@ -1,1956 +0,0 @@
-"""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: # noqa: F811
- return default(env_finalize(value))
-
- else:
- src = f"{src}{pass_arg}, "
-
- if pass_arg == "environment":
-
- def finalize(value: t.Any) -> t.Any: # noqa: F811
- 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})")