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Current File : /opt/hc_python/lib64/python3.12/site-packages/mako/parsetree.py
# mako/parsetree.py
# Copyright 2006-2025 the Mako authors and contributors <see AUTHORS file>
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""defines the parse tree components for Mako templates."""

import re

from mako import ast
from mako import exceptions
from mako import filters
from mako import util


class Node:

    """base class for a Node in the parse tree."""

    def __init__(self, source, lineno, pos, filename):
        self.source = source
        self.lineno = lineno
        self.pos = pos
        self.filename = filename

    @property
    def exception_kwargs(self):
        return {
            "source": self.source,
            "lineno": self.lineno,
            "pos": self.pos,
            "filename": self.filename,
        }

    def get_children(self):
        return []

    def accept_visitor(self, visitor):
        def traverse(node):
            for n in node.get_children():
                n.accept_visitor(visitor)

        method = getattr(visitor, "visit" + self.__class__.__name__, traverse)
        method(self)


class TemplateNode(Node):

    """a 'container' node that stores the overall collection of nodes."""

    def __init__(self, filename):
        super().__init__("", 0, 0, filename)
        self.nodes = []
        self.page_attributes = {}

    def get_children(self):
        return self.nodes

    def __repr__(self):
        return "TemplateNode(%s, %r)" % (
            util.sorted_dict_repr(self.page_attributes),
            self.nodes,
        )


class ControlLine(Node):

    """defines a control line, a line-oriented python line or end tag.

    e.g.::

        % if foo:
            (markup)
        % endif

    """

    has_loop_context = False

    def __init__(self, keyword, isend, text, **kwargs):
        super().__init__(**kwargs)
        self.text = text
        self.keyword = keyword
        self.isend = isend
        self.is_primary = keyword in ["for", "if", "while", "try", "with"]
        self.nodes = []
        if self.isend:
            self._declared_identifiers = []
            self._undeclared_identifiers = []
        else:
            code = ast.PythonFragment(text, **self.exception_kwargs)
            self._declared_identifiers = code.declared_identifiers
            self._undeclared_identifiers = code.undeclared_identifiers

    def get_children(self):
        return self.nodes

    def declared_identifiers(self):
        return self._declared_identifiers

    def undeclared_identifiers(self):
        return self._undeclared_identifiers

    def is_ternary(self, keyword):
        """return true if the given keyword is a ternary keyword
        for this ControlLine"""

        cases = {
            "if": {"else", "elif"},
            "try": {"except", "finally"},
            "for": {"else"},
        }

        return keyword in cases.get(self.keyword, set())

    def __repr__(self):
        return "ControlLine(%r, %r, %r, %r)" % (
            self.keyword,
            self.text,
            self.isend,
            (self.lineno, self.pos),
        )


class Text(Node):
    """defines plain text in the template."""

    def __init__(self, content, **kwargs):
        super().__init__(**kwargs)
        self.content = content

    def __repr__(self):
        return "Text(%r, %r)" % (self.content, (self.lineno, self.pos))


class Code(Node):
    """defines a Python code block, either inline or module level.

    e.g.::

        inline:
        <%
            x = 12
        %>

        module level:
        <%!
            import logger
        %>

    """

    def __init__(self, text, ismodule, **kwargs):
        super().__init__(**kwargs)
        self.text = text
        self.ismodule = ismodule
        self.code = ast.PythonCode(text, **self.exception_kwargs)

    def declared_identifiers(self):
        return self.code.declared_identifiers

    def undeclared_identifiers(self):
        return self.code.undeclared_identifiers

    def __repr__(self):
        return "Code(%r, %r, %r)" % (
            self.text,
            self.ismodule,
            (self.lineno, self.pos),
        )


class Comment(Node):
    """defines a comment line.

    # this is a comment

    """

    def __init__(self, text, **kwargs):
        super().__init__(**kwargs)
        self.text = text

    def __repr__(self):
        return "Comment(%r, %r)" % (self.text, (self.lineno, self.pos))


class Expression(Node):
    """defines an inline expression.

    ${x+y}

    """

    def __init__(self, text, escapes, **kwargs):
        super().__init__(**kwargs)
        self.text = text
        self.escapes = escapes
        self.escapes_code = ast.ArgumentList(escapes, **self.exception_kwargs)
        self.code = ast.PythonCode(text, **self.exception_kwargs)

    def declared_identifiers(self):
        return []

    def undeclared_identifiers(self):
        # TODO: make the "filter" shortcut list configurable at parse/gen time
        return self.code.undeclared_identifiers.union(
            self.escapes_code.undeclared_identifiers.difference(
                filters.DEFAULT_ESCAPES
            )
        ).difference(self.code.declared_identifiers)

    def __repr__(self):
        return "Expression(%r, %r, %r)" % (
            self.text,
            self.escapes_code.args,
            (self.lineno, self.pos),
        )


class _TagMeta(type):
    """metaclass to allow Tag to produce a subclass according to
    its keyword"""

    _classmap = {}

    def __init__(cls, clsname, bases, dict_):
        if getattr(cls, "__keyword__", None) is not None:
            cls._classmap[cls.__keyword__] = cls
        super().__init__(clsname, bases, dict_)

    def __call__(cls, keyword, attributes, **kwargs):
        if ":" in keyword:
            ns, defname = keyword.split(":")
            return type.__call__(
                CallNamespaceTag, ns, defname, attributes, **kwargs
            )

        try:
            cls = _TagMeta._classmap[keyword]
        except KeyError:
            raise exceptions.CompileException(
                "No such tag: '%s'" % keyword,
                source=kwargs["source"],
                lineno=kwargs["lineno"],
                pos=kwargs["pos"],
                filename=kwargs["filename"],
            )
        return type.__call__(cls, keyword, attributes, **kwargs)


class Tag(Node, metaclass=_TagMeta):
    """abstract base class for tags.

    e.g.::

        <%sometag/>

        <%someothertag>
            stuff
        </%someothertag>

    """

    __keyword__ = None

    def __init__(
        self,
        keyword,
        attributes,
        expressions,
        nonexpressions,
        required,
        **kwargs,
    ):
        r"""construct a new Tag instance.

        this constructor not called directly, and is only called
        by subclasses.

        :param keyword: the tag keyword

        :param attributes: raw dictionary of attribute key/value pairs

        :param expressions: a set of identifiers that are legal attributes,
         which can also contain embedded expressions

        :param nonexpressions: a set of identifiers that are legal
         attributes, which cannot contain embedded expressions

        :param \**kwargs:
         other arguments passed to the Node superclass (lineno, pos)

        """
        super().__init__(**kwargs)
        self.keyword = keyword
        self.attributes = attributes
        self._parse_attributes(expressions, nonexpressions)
        missing = [r for r in required if r not in self.parsed_attributes]
        if len(missing):
            raise exceptions.CompileException(
                (
                    "Missing attribute(s): %s"
                    % ",".join(repr(m) for m in missing)
                ),
                **self.exception_kwargs,
            )

        self.parent = None
        self.nodes = []

    def is_root(self):
        return self.parent is None

    def get_children(self):
        return self.nodes

    def _parse_attributes(self, expressions, nonexpressions):
        undeclared_identifiers = set()
        self.parsed_attributes = {}
        for key in self.attributes:
            if key in expressions:
                expr = []
                for x in re.compile(r"(\${(?:[^$]*?{.+|.+?)})", re.S).split(
                    self.attributes[key]
                ):
                    m = re.compile(r"^\${(.+?)}$", re.S).match(x)
                    if m:
                        code = ast.PythonCode(
                            m.group(1).rstrip(), **self.exception_kwargs
                        )
                        # we aren't discarding "declared_identifiers" here,
                        # which we do so that list comprehension-declared
                        # variables aren't counted.   As yet can't find a
                        # condition that requires it here.
                        undeclared_identifiers = undeclared_identifiers.union(
                            code.undeclared_identifiers
                        )
                        expr.append("(%s)" % m.group(1))
                    elif x:
                        expr.append(repr(x))
                self.parsed_attributes[key] = " + ".join(expr) or repr("")
            elif key in nonexpressions:
                if re.search(r"\${.+?}", self.attributes[key]):
                    raise exceptions.CompileException(
                        "Attribute '%s' in tag '%s' does not allow embedded "
                        "expressions" % (key, self.keyword),
                        **self.exception_kwargs,
                    )
                self.parsed_attributes[key] = repr(self.attributes[key])
            else:
                raise exceptions.CompileException(
                    "Invalid attribute for tag '%s': '%s'"
                    % (self.keyword, key),
                    **self.exception_kwargs,
                )
        self.expression_undeclared_identifiers = undeclared_identifiers

    def declared_identifiers(self):
        return []

    def undeclared_identifiers(self):
        return self.expression_undeclared_identifiers

    def __repr__(self):
        return "%s(%r, %s, %r, %r)" % (
            self.__class__.__name__,
            self.keyword,
            util.sorted_dict_repr(self.attributes),
            (self.lineno, self.pos),
            self.nodes,
        )


class IncludeTag(Tag):
    __keyword__ = "include"

    def __init__(self, keyword, attributes, **kwargs):
        super().__init__(
            keyword,
            attributes,
            ("file", "import", "args"),
            (),
            ("file",),
            **kwargs,
        )
        self.page_args = ast.PythonCode(
            "__DUMMY(%s)" % attributes.get("args", ""), **self.exception_kwargs
        )

    def declared_identifiers(self):
        return []

    def undeclared_identifiers(self):
        identifiers = self.page_args.undeclared_identifiers.difference(
            {"__DUMMY"}
        ).difference(self.page_args.declared_identifiers)
        return identifiers.union(super().undeclared_identifiers())


class NamespaceTag(Tag):
    __keyword__ = "namespace"

    def __init__(self, keyword, attributes, **kwargs):
        super().__init__(
            keyword,
            attributes,
            ("file",),
            ("name", "inheritable", "import", "module"),
            (),
            **kwargs,
        )

        self.name = attributes.get("name", "__anon_%s" % hex(abs(id(self))))
        if "name" not in attributes and "import" not in attributes:
            raise exceptions.CompileException(
                "'name' and/or 'import' attributes are required "
                "for <%namespace>",
                **self.exception_kwargs,
            )
        if "file" in attributes and "module" in attributes:
            raise exceptions.CompileException(
                "<%namespace> may only have one of 'file' or 'module'",
                **self.exception_kwargs,
            )

    def declared_identifiers(self):
        return []


class TextTag(Tag):
    __keyword__ = "text"

    def __init__(self, keyword, attributes, **kwargs):
        super().__init__(keyword, attributes, (), ("filter"), (), **kwargs)
        self.filter_args = ast.ArgumentList(
            attributes.get("filter", ""), **self.exception_kwargs
        )

    def undeclared_identifiers(self):
        return self.filter_args.undeclared_identifiers.difference(
            filters.DEFAULT_ESCAPES.keys()
        ).union(self.expression_undeclared_identifiers)


class DefTag(Tag):
    __keyword__ = "def"

    def __init__(self, keyword, attributes, **kwargs):
        expressions = ["buffered", "cached"] + [
            c for c in attributes if c.startswith("cache_")
        ]

        super().__init__(
            keyword,
            attributes,
            expressions,
            ("name", "filter", "decorator"),
            ("name",),
            **kwargs,
        )
        name = attributes["name"]
        if re.match(r"^[\w_]+$", name):
            raise exceptions.CompileException(
                "Missing parenthesis in %def", **self.exception_kwargs
            )
        self.function_decl = ast.FunctionDecl(
            "def " + name + ":pass", **self.exception_kwargs
        )
        self.name = self.function_decl.funcname
        self.decorator = attributes.get("decorator", "")
        self.filter_args = ast.ArgumentList(
            attributes.get("filter", ""), **self.exception_kwargs
        )

    is_anonymous = False
    is_block = False

    @property
    def funcname(self):
        return self.function_decl.funcname

    def get_argument_expressions(self, **kw):
        return self.function_decl.get_argument_expressions(**kw)

    def declared_identifiers(self):
        return self.function_decl.allargnames

    def undeclared_identifiers(self):
        res = []
        for c in self.function_decl.defaults:
            res += list(
                ast.PythonCode(
                    c, **self.exception_kwargs
                ).undeclared_identifiers
            )
        return (
            set(res)
            .union(
                self.filter_args.undeclared_identifiers.difference(
                    filters.DEFAULT_ESCAPES.keys()
                )
            )
            .union(self.expression_undeclared_identifiers)
            .difference(self.function_decl.allargnames)
        )


class BlockTag(Tag):
    __keyword__ = "block"

    def __init__(self, keyword, attributes, **kwargs):
        expressions = ["buffered", "cached", "args"] + [
            c for c in attributes if c.startswith("cache_")
        ]

        super().__init__(
            keyword,
            attributes,
            expressions,
            ("name", "filter", "decorator"),
            (),
            **kwargs,
        )
        name = attributes.get("name")
        if name and not re.match(r"^[\w_]+$", name):
            raise exceptions.CompileException(
                "%block may not specify an argument signature",
                **self.exception_kwargs,
            )
        if not name and attributes.get("args", None):
            raise exceptions.CompileException(
                "Only named %blocks may specify args", **self.exception_kwargs
            )
        self.body_decl = ast.FunctionArgs(
            attributes.get("args", ""), **self.exception_kwargs
        )

        self.name = name
        self.decorator = attributes.get("decorator", "")
        self.filter_args = ast.ArgumentList(
            attributes.get("filter", ""), **self.exception_kwargs
        )

    is_block = True

    @property
    def is_anonymous(self):
        return self.name is None

    @property
    def funcname(self):
        return self.name or "__M_anon_%d" % (self.lineno,)

    def get_argument_expressions(self, **kw):
        return self.body_decl.get_argument_expressions(**kw)

    def declared_identifiers(self):
        return self.body_decl.allargnames

    def undeclared_identifiers(self):
        return (
            self.filter_args.undeclared_identifiers.difference(
                filters.DEFAULT_ESCAPES.keys()
            )
        ).union(self.expression_undeclared_identifiers)


class CallTag(Tag):
    __keyword__ = "call"

    def __init__(self, keyword, attributes, **kwargs):
        super().__init__(
            keyword, attributes, ("args"), ("expr",), ("expr",), **kwargs
        )
        self.expression = attributes["expr"]
        self.code = ast.PythonCode(self.expression, **self.exception_kwargs)
        self.body_decl = ast.FunctionArgs(
            attributes.get("args", ""), **self.exception_kwargs
        )

    def declared_identifiers(self):
        return self.code.declared_identifiers.union(self.body_decl.allargnames)

    def undeclared_identifiers(self):
        return self.code.undeclared_identifiers.difference(
            self.code.declared_identifiers
        )


class CallNamespaceTag(Tag):
    def __init__(self, namespace, defname, attributes, **kwargs):
        super().__init__(
            namespace + ":" + defname,
            attributes,
            tuple(attributes.keys()) + ("args",),
            (),
            (),
            **kwargs,
        )

        self.expression = "%s.%s(%s)" % (
            namespace,
            defname,
            ",".join(
                "%s=%s" % (k, v)
                for k, v in self.parsed_attributes.items()
                if k != "args"
            ),
        )

        self.code = ast.PythonCode(self.expression, **self.exception_kwargs)
        self.body_decl = ast.FunctionArgs(
            attributes.get("args", ""), **self.exception_kwargs
        )

    def declared_identifiers(self):
        return self.code.declared_identifiers.union(self.body_decl.allargnames)

    def undeclared_identifiers(self):
        return self.code.undeclared_identifiers.difference(
            self.code.declared_identifiers
        )


class InheritTag(Tag):
    __keyword__ = "inherit"

    def __init__(self, keyword, attributes, **kwargs):
        super().__init__(
            keyword, attributes, ("file",), (), ("file",), **kwargs
        )


class PageTag(Tag):
    __keyword__ = "page"

    def __init__(self, keyword, attributes, **kwargs):
        expressions = [
            "cached",
            "args",
            "expression_filter",
            "enable_loop",
        ] + [c for c in attributes if c.startswith("cache_")]

        super().__init__(keyword, attributes, expressions, (), (), **kwargs)
        self.body_decl = ast.FunctionArgs(
            attributes.get("args", ""), **self.exception_kwargs
        )
        self.filter_args = ast.ArgumentList(
            attributes.get("expression_filter", ""), **self.exception_kwargs
        )

    def declared_identifiers(self):
        return self.body_decl.allargnames

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