/usr/lib/python2.7/dist-packages/chameleon/codegen.py is in python-chameleon 2.16-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import ast
except ImportError:
from chameleon import ast25 as ast
import inspect
import textwrap
import types
import copy
try:
import __builtin__ as builtins
except ImportError:
import builtins
reverse_builtin_map = {}
for name, value in builtins.__dict__.items():
try:
hash(value)
except TypeError:
continue
reverse_builtin_map[value] = name
try:
basestring
except NameError:
basestring = str
from .astutil import ASTCodeGenerator
from .astutil import load
from .astutil import store
from .astutil import parse
from .astutil import Builtin
from .astutil import Symbol
from .astutil import node_annotations
from .exc import CompilationError
try:
NATIVE_NUMBERS = int, float, long, bool
except NameError:
NATIVE_NUMBERS = int, float, bool
def template(function, mode='exec', **kw):
def wrapper(*vargs, **kwargs):
symbols = dict(zip(args, vargs + defaults))
symbols.update(kwargs)
class Visitor(ast.NodeVisitor):
def visit_FunctionDef(self, node):
self.generic_visit(node)
name = symbols.get(node.name, self)
if name is not self:
node_annotations[node] = ast.FunctionDef(
name=name,
args=node.args,
body=node.body,
decorator_list=getattr(node, "decorator_list", []),
)
def visit_Name(self, node):
value = symbols.get(node.id, self)
if value is not self:
if isinstance(value, basestring):
value = load(value)
if isinstance(value, type) or value in reverse_builtin_map:
name = reverse_builtin_map.get(value)
if name is not None:
value = Builtin(name)
else:
value = Symbol(value)
assert node not in node_annotations
assert hasattr(value, '_fields')
node_annotations[node] = value
expr = parse(source, mode=mode)
if not isinstance(function, basestring):
expr = expr.body[0]
Visitor().visit(expr)
return expr.body
if isinstance(function, basestring):
source = function
defaults = args = ()
return wrapper(**kw)
source = textwrap.dedent(inspect.getsource(function))
argspec = inspect.getargspec(function)
args = argspec[0]
defaults = argspec[3] or ()
return wrapper
class TemplateCodeGenerator(ASTCodeGenerator):
"""Extends the standard Python code generator class with handlers
for the helper node classes:
- Symbol (an importable value)
- Static (value that can be made global)
- Builtin (from the builtins module)
- Marker (short-hand for a unique static object)
"""
names = ()
def __init__(self, tree):
self.imports = {}
self.defines = {}
self.markers = {}
# Generate code
super(TemplateCodeGenerator, self).__init__(tree)
def visit_Module(self, node):
super(TemplateCodeGenerator, self).visit_Module(node)
# Make sure we terminate the line printer
self.flush()
# Clear lines array for import visits
body = self.lines
self.lines = []
while self.defines:
name, node = self.defines.popitem()
assignment = ast.Assign(targets=[store(name)], value=node)
self.visit(assignment)
# Make sure we terminate the line printer
self.flush()
# Clear lines array for import visits
defines = self.lines
self.lines = []
while self.imports:
value, node = self.imports.popitem()
if isinstance(value, types.ModuleType):
stmt = ast.Import(
names=[ast.alias(name=value.__name__, asname=node.id)])
elif hasattr(value, '__name__'):
path = reverse_builtin_map.get(value)
if path is None:
path = value.__module__
name = value.__name__
stmt = ast.ImportFrom(
module=path,
names=[ast.alias(name=name, asname=node.id)],
level=0,
)
else:
raise TypeError(value)
self.visit(stmt)
# Clear last import
self.flush()
# Stich together lines
self.lines += defines + body
def define(self, name, node):
assert node is not None
value = self.defines.get(name)
if value is node:
pass
elif value is None:
self.defines[name] = node
else:
raise CompilationError(
"Duplicate symbol name for define.", name)
return load(name)
def require(self, value):
if value is None:
return load("None")
if isinstance(value, NATIVE_NUMBERS):
return ast.Num(value)
node = self.imports.get(value)
if node is None:
# we come up with a unique symbol based on the class name
name = "_%s" % getattr(value, '__name__', str(value)).\
rsplit('.', 1)[-1]
node = load(name)
self.imports[value] = store(node.id)
return node
def visit(self, node):
annotation = node_annotations.get(node)
if annotation is None:
super(TemplateCodeGenerator, self).visit(node)
else:
self.visit(annotation)
def visit_Comment(self, node):
if node.stmt is None:
self._new_line()
else:
self.visit(node.stmt)
for line in node.text.replace('\r', '\n').split('\n'):
self._new_line()
self._write("%s#%s" % (node.space, line))
def visit_Builtin(self, node):
name = load(node.id)
self.visit(name)
def visit_Symbol(self, node):
node = self.require(node.value)
self.visit(node)
def visit_Static(self, node):
if node.name is None:
name = "_static_%s" % str(id(node.value)).replace('-', '_')
else:
name = node.name
node = self.define(name, node.value)
self.visit(node)
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