Revert "rename directory to jinja"

This reverts commit eac9acb7aeabf6f3e0ed4cb876e200e5e72d0d0e.

1 files changed, 111 insertions, 0 deletions

diff --git a/src/jinja2/nativetypes.py b/src/jinja2/nativetypes.py
new file mode 100644
index 00000000..9866c962
--- /dev/null
+++ b/src/jinja2/nativetypes.py
@@ -0,0 +1,111 @@
+import types
+from ast import literal_eval
+from itertools import chain
+from itertools import islice
+
+from . import nodes
+from ._compat import text_type
+from .compiler import CodeGenerator
+from .compiler import has_safe_repr
+from .environment import Environment
+from .environment import Template
+
+
+def native_concat(nodes, preserve_quotes=True):
+    """Return a native Python type from the list of compiled nodes. If
+    the result is a single node, its value is returned. Otherwise, the
+    nodes are concatenated as strings. If the result can be parsed with
+    :func:`ast.literal_eval`, the parsed value is returned. Otherwise,
+    the string is returned.
+
+    :param nodes: Iterable of nodes to concatenate.
+    :param preserve_quotes: Whether to re-wrap literal strings with
+        quotes, to preserve quotes around expressions for later parsing.
+        Should be ``False`` in :meth:`NativeEnvironment.render`.
+    """
+    head = list(islice(nodes, 2))
+
+    if not head:
+        return None
+
+    if len(head) == 1:
+        raw = head[0]
+    else:
+        if isinstance(nodes, types.GeneratorType):
+            nodes = chain(head, nodes)
+        raw = u"".join([text_type(v) for v in nodes])
+
+    try:
+        literal = literal_eval(raw)
+    except (ValueError, SyntaxError, MemoryError):
+        return raw
+
+    # If literal_eval returned a string, re-wrap with the original
+    # quote character to avoid dropping quotes between expression nodes.
+    # Without this, "'{{ a }}', '{{ b }}'" results in "a, b", but should
+    # be ('a', 'b').
+    if preserve_quotes and isinstance(literal, str):
+        return "{quote}{}{quote}".format(literal, quote=raw[0])
+
+    return literal
+
+
+class NativeCodeGenerator(CodeGenerator):
+    """A code generator which renders Python types by not adding
+    ``to_string()`` around output nodes, and using :func:`native_concat`
+    to convert complex strings back to Python types if possible.
+    """
+
+    @staticmethod
+    def _default_finalize(value):
+        return value
+
+    def _output_const_repr(self, group):
+        return repr(native_concat(group))
+
+    def _output_child_to_const(self, node, frame, finalize):
+        const = node.as_const(frame.eval_ctx)
+
+        if not has_safe_repr(const):
+            raise nodes.Impossible()
+
+        if isinstance(node, nodes.TemplateData):
+            return const
+
+        return finalize.const(const)
+
+    def _output_child_pre(self, node, frame, finalize):
+        if finalize.src is not None:
+            self.write(finalize.src)
+
+    def _output_child_post(self, node, frame, finalize):
+        if finalize.src is not None:
+            self.write(")")
+
+
+class NativeEnvironment(Environment):
+    """An environment that renders templates to native Python types."""
+
+    code_generator_class = NativeCodeGenerator
+
+
+class NativeTemplate(Template):
+    environment_class = NativeEnvironment
+
+    def render(self, *args, **kwargs):
+        """Render the template to produce a native Python type. If the
+        result is a single node, its value is returned. Otherwise, the
+        nodes are concatenated as strings. If the result can be parsed
+        with :func:`ast.literal_eval`, the parsed value is returned.
+        Otherwise, the string is returned.
+        """
+        vars = dict(*args, **kwargs)
+        try:
+            return native_concat(
+                self.root_render_func(self.new_context(vars)), preserve_quotes=False
+            )
+        except Exception:
+            return self.environment.handle_exception()
+
+
+NativeEnvironment.template_class = NativeTemplate