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author | floatdrop <floatdrop@yandex-team.ru> | 2022-02-10 16:47:15 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:47:15 +0300 |
commit | e63b84f1d39557d9e46ac380b1f388271894293c (patch) | |
tree | 338cdaff3fb027e030b847db66df06019a0e3149 /contrib/python/Jinja2/py2/jinja2/visitor.py | |
parent | f60febb7ea449535e7b073c386c7ff0539637fc0 (diff) | |
download | ydb-e63b84f1d39557d9e46ac380b1f388271894293c.tar.gz |
Restoring authorship annotation for <floatdrop@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/python/Jinja2/py2/jinja2/visitor.py')
-rw-r--r-- | contrib/python/Jinja2/py2/jinja2/visitor.py | 154 |
1 files changed, 77 insertions, 77 deletions
diff --git a/contrib/python/Jinja2/py2/jinja2/visitor.py b/contrib/python/Jinja2/py2/jinja2/visitor.py index d1365bf10e..7e65ca1bc0 100644 --- a/contrib/python/Jinja2/py2/jinja2/visitor.py +++ b/contrib/python/Jinja2/py2/jinja2/visitor.py @@ -1,81 +1,81 @@ -# -*- coding: utf-8 -*- +# -*- coding: utf-8 -*- """API for traversing the AST nodes. Implemented by the compiler and meta introspection. -""" +""" from .nodes import Node - - -class NodeVisitor(object): - """Walks the abstract syntax tree and call visitor functions for every - node found. The visitor functions may return values which will be - forwarded by the `visit` method. - - Per default the visitor functions for the nodes are ``'visit_'`` + - class name of the node. So a `TryFinally` node visit function would - be `visit_TryFinally`. This behavior can be changed by overriding - the `get_visitor` function. If no visitor function exists for a node - (return value `None`) the `generic_visit` visitor is used instead. - """ - - def get_visitor(self, node): - """Return the visitor function for this node or `None` if no visitor - exists for this node. In that case the generic visit function is - used instead. - """ + + +class NodeVisitor(object): + """Walks the abstract syntax tree and call visitor functions for every + node found. The visitor functions may return values which will be + forwarded by the `visit` method. + + Per default the visitor functions for the nodes are ``'visit_'`` + + class name of the node. So a `TryFinally` node visit function would + be `visit_TryFinally`. This behavior can be changed by overriding + the `get_visitor` function. If no visitor function exists for a node + (return value `None`) the `generic_visit` visitor is used instead. + """ + + def get_visitor(self, node): + """Return the visitor function for this node or `None` if no visitor + exists for this node. In that case the generic visit function is + used instead. + """ method = "visit_" + node.__class__.__name__ - return getattr(self, method, None) - - def visit(self, node, *args, **kwargs): - """Visit a node.""" - f = self.get_visitor(node) - if f is not None: - return f(node, *args, **kwargs) - return self.generic_visit(node, *args, **kwargs) - - def generic_visit(self, node, *args, **kwargs): - """Called if no explicit visitor function exists for a node.""" - for node in node.iter_child_nodes(): - self.visit(node, *args, **kwargs) - - -class NodeTransformer(NodeVisitor): - """Walks the abstract syntax tree and allows modifications of nodes. - - The `NodeTransformer` will walk the AST and use the return value of the - visitor functions to replace or remove the old node. If the return - value of the visitor function is `None` the node will be removed - from the previous location otherwise it's replaced with the return - value. The return value may be the original node in which case no - replacement takes place. - """ - - def generic_visit(self, node, *args, **kwargs): - for field, old_value in node.iter_fields(): - if isinstance(old_value, list): - new_values = [] - for value in old_value: - if isinstance(value, Node): - value = self.visit(value, *args, **kwargs) - if value is None: - continue - elif not isinstance(value, Node): - new_values.extend(value) - continue - new_values.append(value) - old_value[:] = new_values - elif isinstance(old_value, Node): - new_node = self.visit(old_value, *args, **kwargs) - if new_node is None: - delattr(node, field) - else: - setattr(node, field, new_node) - return node - - def visit_list(self, node, *args, **kwargs): - """As transformers may return lists in some places this method - can be used to enforce a list as return value. - """ - rv = self.visit(node, *args, **kwargs) - if not isinstance(rv, list): - rv = [rv] - return rv + return getattr(self, method, None) + + def visit(self, node, *args, **kwargs): + """Visit a node.""" + f = self.get_visitor(node) + if f is not None: + return f(node, *args, **kwargs) + return self.generic_visit(node, *args, **kwargs) + + def generic_visit(self, node, *args, **kwargs): + """Called if no explicit visitor function exists for a node.""" + for node in node.iter_child_nodes(): + self.visit(node, *args, **kwargs) + + +class NodeTransformer(NodeVisitor): + """Walks the abstract syntax tree and allows modifications of nodes. + + The `NodeTransformer` will walk the AST and use the return value of the + visitor functions to replace or remove the old node. If the return + value of the visitor function is `None` the node will be removed + from the previous location otherwise it's replaced with the return + value. The return value may be the original node in which case no + replacement takes place. + """ + + def generic_visit(self, node, *args, **kwargs): + for field, old_value in node.iter_fields(): + if isinstance(old_value, list): + new_values = [] + for value in old_value: + if isinstance(value, Node): + value = self.visit(value, *args, **kwargs) + if value is None: + continue + elif not isinstance(value, Node): + new_values.extend(value) + continue + new_values.append(value) + old_value[:] = new_values + elif isinstance(old_value, Node): + new_node = self.visit(old_value, *args, **kwargs) + if new_node is None: + delattr(node, field) + else: + setattr(node, field, new_node) + return node + + def visit_list(self, node, *args, **kwargs): + """As transformers may return lists in some places this method + can be used to enforce a list as return value. + """ + rv = self.visit(node, *args, **kwargs) + if not isinstance(rv, list): + rv = [rv] + return rv |