def taskRunEval(tree,
process, shell,
env=None, extra_env = None, context=None, context_vals=None,
pre_code = "", expr_code = "", name="", copy=True, tempname='_evaluation_object_',
call=None):
try:
# Prepare code and mode -----------------------------------------------
if (expr_code and name) or (not expr_code and isinstance(tree, ast.Module)):
mode = 'exec'
else:
mode = 'eval'
tree = ast.Expression(tree)
# Expression code takes precedence over tree code
if expr_code: code = expr_code
else: code = compile(tree, "<script>", mode)
# Set up environment --------------------------------------------------
# avoid deepy copy if specified, or just looking up variable by name
if not copy or (isinstance(tree, (ast.Name, ast.Subscript)) and isinstance(tree.ctx, ast.Load)):
new_env = dict(get_env(shell.user_ns))
else:
new_env = utils.copy_env(get_env(shell.user_ns))
if env is not None:
new_env.update(deepcopy(env))
if extra_env is not None:
new_env.update(deepcopy(extra_env))
if context is not None:
set_context_vals(new_env, context, context_vals)
# Execute code --------------------------------------------------------
# Run pre_code if specified
if pre_code: exec(pre_code, new_env)
if mode == 'eval':
obj = eval(code, new_env)
else:
exec(code, new_env)
obj = "exec only"
# If name given, get from new_env
if name:
try:
obj = eval(name, new_env)
except NameError:
return UndefinedValue()
# call object if dict with args and kwargs was passed
if call is not None:
obj = obj(*call['args'], **call['kwargs'])
# Set object as temp variable in original environment, so we can
# later get its class, etc.., in order to extract it from process
get_env(shell.user_ns)[tempname] = obj
return str(obj)
except Exception as e:
return e
def taskRunEval(tree,
process, shell,
keep_objs_in_env = None, extra_env = None, context=None, context_vals=None,
pre_code = "", expr_code = "", name="", tempname='_evaluation_object_', do_exec=False,
call=None):
new_env = utils.copy_env(get_env(shell.user_ns), keep_objs_in_env)
if extra_env is not None:
new_env.update(copy.deepcopy(extra_env))
if context is not None:
set_context_vals(new_env, context, context_vals)
try:
# Execute pre_code if specified
if pre_code: exec(pre_code, new_env)
# If no name given, the object of interest is the output of eval
# otherwise, we'll use name to get the object from the environment
if not (name or do_exec):
mode = 'eval'
tree = ast.Expression(tree)
else:
mode = 'exec'
# Expression code takes precedence over tree code
if expr_code: code = expr_code
else: code = compile(tree, "<script>", mode)
if mode == 'eval':
obj = eval(code, new_env)
else:
exec(code, new_env)
obj = "exec only"
# If name given, get from new_env
if name:
try:
if isinstance(name, ast.AST):
obj = eval(compile(tree, "<script>", "eval"), new_env)
else:
obj = eval(name, new_env)
except NameError:
return UndefinedValue()
# call object if dict with args and kwargs was passed
if call is not None:
obj = obj(*call['args'], **call['kwargs'])
# Set object as temp variable in original environment, so we can
# later get its class, etc.., in order to extract it from process
get_env(shell.user_ns)[tempname] = obj
return str(obj)
except Exception as e:
return e
def taskRunEval(
tree,
process,
shell,
env=None,
extra_env=None,
context=None,
context_vals=None,
pre_code="",
expr_code="",
name="",
copy=True,
tempname="_evaluation_object_",
call=None,
):
"""
Eval an expression tree (with setting envs, pre_code and/or expr_code)
Utility function later wrapped to extract either result (end state of a variable), output (stdout) or error
Args:
tree (ast): current focused ast, used to get code to execute
process: manages shell (see local.py)
shell: link to to get process namespace from execution up until now
env: update value in focused code by name
extra_env: variables to be replaced in focused code by name from extra_env in has_expr
context: sum of set_context in sct chain
context_vals: extra context argument in has_expr
pre_code: argument in has_expr to execute code before evaluating, for example to set a seed
expr_code: code to execute instead of focused code
name: extract value after executing focused expr_code (~post_code)
copy: copy entire env because our expr_code could have side effects
tempname: key for the result when it is added to context, only for v1 sct's
call: only used in v1 sct's
Returns:
str: output of the executed code
"""
try:
# Prepare code and mode -----------------------------------------------
# Verify if expr_code is expression code (returning a value) or just runnable code.
if ( # expr_code returns nothing and then we will extract a value
expr_code and name
) or ( # No expr_code and the tree is of a node type that does not evaluate to have output
not expr_code and isinstance(tree, ast.Module)
):
# We are not focused on an expression (no output)
mode = "exec"
else:
mode = "eval"
# Wrap the focused node in the tree so it can be run with eval()
if not isinstance(tree, (ast.Module, ast.Expression, ast.Expr)):
tree = ast.Expression(tree)
# Expression code takes precedence over tree code
if expr_code:
code = expr_code
tree = ast.parse(code, mode=mode)
else: # Compile the tree to Python code
code = compile(tree, "<script>", mode)
# Set up environment --------------------------------------------------
# Unpack 'container nodes' before checking if a deepcopy is needed
if isinstance(tree, ast.Module):
tree = tree.body
if isinstance(tree, ast.Expression):
tree = tree.body
if isinstance(tree, ast.Expr):
tree = tree.value
# Avoid a deep copy if specified or if the ast node type indicates we are looking up a variable by name
# ast.Name, ast.Subscript and ast.Load most of the time do not have side effects in the environment,
# making a deepcopy unnecessary
if not copy or (
isinstance(tree, (ast.Name, ast.Subscript))
and isinstance(tree.ctx, ast.Load)
):
new_env = dict(get_env(shell.user_ns)) # shallow copy of env
else:
# might raise an error if object refuses pickle interface
# used by deepcopy to restore class
new_env = utils.copy_env(get_env(shell.user_ns))
# Apply additional env and context variables
if env is not None:
new_env.update(deepcopy(env))
if extra_env is not None:
new_env.update(deepcopy(extra_env))
if context is not None:
set_context_vals(new_env, context, context_vals)
# Execute code --------------------------------------------------------
# Run pre_code if specified
if pre_code:
exec(pre_code, new_env)
if mode == "eval":
obj = eval(code, new_env)
else:
exec(code, new_env)
obj = "exec only"
# If name given, get from new_env
if name:
try:
obj = eval(name, new_env)
except NameError:
return UndefinedValue()
# Backwards compatibility with v1 SCT's
# If object is callable, args and kwargs can be passed in to be used in a call on object
if call is not None:
obj = obj(*call["args"], **call["kwargs"])
# Set object as temp variable in original environment, so we can
# later get its class, etc.., in order to extract it from process
get_env(shell.user_ns)[tempname] = obj
return str(obj)
except Exception as e:
return e